Fixed a few issues:

- Incorrect name being shown on dashboard "Proxies page"
- Apps being shown when homepage.show is false
- Load balanced routes are shown on homepage instead of the load balancer
- Route with idlewatcher will now be removed on container destroy
- Idlewatcher panic
- Performance improvement
- Idlewatcher infinitely loading
- Reload stucked / not working properly
- Streams stuck on shutdown / reload
- etc...
Added:
- support idlewatcher for loadbalanced routes
- partial implementation for stream type idlewatcher
Issues:
- graceful shutdown

Makefile

@@ -30,6 +30,12 @@ get:
 debug:
 	make build && sudo GOPROXY_DEBUG=1 bin/go-proxy
 
+debug-trace:
+	make build && sudo GOPROXY_DEBUG=1 GOPROXY_TRACE=1 bin/go-proxy
+
+profile:
+	GODEBUG=gctrace=1 make build && sudo GOPROXY_DEBUG=1 bin/go-proxy
+
 mtrace:
 	bin/go-proxy debug-ls-mtrace > mtrace.json
 

cmd/main.go

@@ -20,6 +20,7 @@ import (
 	"github.com/yusing/go-proxy/internal/net/http/middleware"
 	R "github.com/yusing/go-proxy/internal/route"
 	"github.com/yusing/go-proxy/internal/server"
+	"github.com/yusing/go-proxy/internal/task"
 	"github.com/yusing/go-proxy/pkg"
 )
 
@@ -32,8 +33,14 @@ func main() {
 	}
 
 	l := logrus.WithField("module", "main")
+	timeFmt := "01-02 15:04:05"
+	fullTS := true
 
-	if common.IsDebug {
+	if common.IsTrace {
+		logrus.SetLevel(logrus.TraceLevel)
+		timeFmt = "04:05"
+		fullTS = false
+	} else if common.IsDebug {
 		logrus.SetLevel(logrus.DebugLevel)
 	}
 
@@ -42,9 +49,9 @@ func main() {
 	} else {
 		logrus.SetFormatter(&logrus.TextFormatter{
 			DisableSorting:  true,
-			FullTimestamp:   true,
+			FullTimestamp:   fullTS,
 			ForceColors:     true,
-			TimestampFormat: "01-02 15:04:05",
+			TimestampFormat: timeFmt,
 		})
 		logrus.Infof("go-proxy version %s", pkg.GetVersion())
 	}
@@ -76,21 +83,22 @@ func main() {
 
 	middleware.LoadComposeFiles()
 
-	if err := config.Load(); err != nil {
+	var cfg *config.Config
+	var err E.NestedError
+	if cfg, err = config.Load(); err != nil {
 		logrus.Warn(err)
 	}
-	cfg := config.GetInstance()
 
 	switch args.Command {
 	case common.CommandListConfigs:
-		printJSON(cfg.Value())
+		printJSON(config.Value())
 		return
 	case common.CommandListRoutes:
 		routes, err := query.ListRoutes()
 		if err != nil {
 			log.Printf("failed to connect to api server: %s", err)
 			log.Printf("falling back to config file")
-			printJSON(cfg.RoutesByAlias())
+			printJSON(config.RoutesByAlias())
 		} else {
 			printJSON(routes)
 		}
@@ -103,10 +111,10 @@ func main() {
 		printJSON(icons)
 		return
 	case common.CommandDebugListEntries:
-		printJSON(cfg.DumpEntries())
+		printJSON(config.DumpEntries())
 		return
 	case common.CommandDebugListProviders:
-		printJSON(cfg.DumpProviders())
+		printJSON(config.DumpProviders())
 		return
 	case common.CommandDebugListMTrace:
 		trace, err := query.ListMiddlewareTraces()
@@ -114,17 +122,25 @@ func main() {
 			log.Fatal(err)
 		}
 		printJSON(trace)
+		return
+	case common.CommandDebugListTasks:
+		tasks, err := query.DebugListTasks()
+		if err != nil {
+			log.Fatal(err)
+		}
+		printJSON(tasks)
+		return
 	}
 
 	cfg.StartProxyProviders()
-	cfg.WatchChanges()
+	config.WatchChanges()
 
 	sig := make(chan os.Signal, 1)
 	signal.Notify(sig, syscall.SIGINT)
 	signal.Notify(sig, syscall.SIGTERM)
 	signal.Notify(sig, syscall.SIGHUP)
 
-	autocert := cfg.GetAutoCertProvider()
+	autocert := config.GetAutoCertProvider()
 	if autocert != nil {
 		if err := autocert.Setup(); err != nil {
 			l.Fatal(err)
@@ -139,14 +155,14 @@ func main() {
 		HTTPAddr:        common.ProxyHTTPAddr,
 		HTTPSAddr:       common.ProxyHTTPSAddr,
 		Handler:         http.HandlerFunc(R.ProxyHandler),
-		RedirectToHTTPS: cfg.Value().RedirectToHTTPS,
+		RedirectToHTTPS: config.Value().RedirectToHTTPS,
 	})
 	apiServer := server.InitAPIServer(server.Options{
 		Name:            "api",
 		CertProvider:    autocert,
 		HTTPAddr:        common.APIHTTPAddr,
-		Handler:         api.NewHandler(cfg),
-		RedirectToHTTPS: cfg.Value().RedirectToHTTPS,
+		Handler:         api.NewHandler(),
+		RedirectToHTTPS: config.Value().RedirectToHTTPS,
 	})
 
 	proxyServer.Start()
@@ -157,8 +173,8 @@ func main() {
 
 	// grafully shutdown
 	logrus.Info("shutting down")
-	common.CancelGlobalContext()
-	common.GlobalContextWait(time.Second * time.Duration(cfg.Value().TimeoutShutdown))
+	task.CancelGlobalContext()
+	task.GlobalContextWait(time.Second * time.Duration(config.Value().TimeoutShutdown))
 }
 
 func prepareDirectory(dir string) {

internal/api/handler.go

@@ -2,6 +2,7 @@ package api
 
 import (
 	"fmt"
+	"net"
 	"net/http"
 
 	v1 "github.com/yusing/go-proxy/internal/api/v1"
@@ -21,34 +22,35 @@ func (mux ServeMux) HandleFunc(method, endpoint string, handler http.HandlerFunc
 	mux.ServeMux.HandleFunc(fmt.Sprintf("%s %s", method, endpoint), checkHost(handler))
 }
 
-func NewHandler(cfg *config.Config) http.Handler {
+func NewHandler() http.Handler {
 	mux := NewServeMux()
 	mux.HandleFunc("GET", "/v1", v1.Index)
 	mux.HandleFunc("GET", "/v1/version", v1.GetVersion)
-	mux.HandleFunc("GET", "/v1/checkhealth", wrap(cfg, v1.CheckHealth))
-	mux.HandleFunc("HEAD", "/v1/checkhealth", wrap(cfg, v1.CheckHealth))
-	mux.HandleFunc("POST", "/v1/reload", wrap(cfg, v1.Reload))
-	mux.HandleFunc("GET", "/v1/list", wrap(cfg, v1.List))
-	mux.HandleFunc("GET", "/v1/list/{what}", wrap(cfg, v1.List))
+	mux.HandleFunc("GET", "/v1/checkhealth", v1.CheckHealth)
+	mux.HandleFunc("HEAD", "/v1/checkhealth", v1.CheckHealth)
+	mux.HandleFunc("POST", "/v1/reload", v1.Reload)
+	mux.HandleFunc("GET", "/v1/list", v1.List)
+	mux.HandleFunc("GET", "/v1/list/{what}", v1.List)
 	mux.HandleFunc("GET", "/v1/file", v1.GetFileContent)
 	mux.HandleFunc("GET", "/v1/file/{filename...}", v1.GetFileContent)
 	mux.HandleFunc("POST", "/v1/file/{filename...}", v1.SetFileContent)
 	mux.HandleFunc("PUT", "/v1/file/{filename...}", v1.SetFileContent)
-	mux.HandleFunc("GET", "/v1/stats", wrap(cfg, v1.Stats))
-	mux.HandleFunc("GET", "/v1/stats/ws", wrap(cfg, v1.StatsWS))
+	mux.HandleFunc("GET", "/v1/stats", v1.Stats)
+	mux.HandleFunc("GET", "/v1/stats/ws", v1.StatsWS)
 	mux.HandleFunc("GET", "/v1/error_page", errorpage.GetHandleFunc())
 	return mux
 }
 
-// allow only requests to API server with host matching common.APIHTTPAddr.
+// allow only requests to API server with localhost.
 func checkHost(f http.HandlerFunc) http.HandlerFunc {
 	if common.IsDebug {
 		return f
 	}
 	return func(w http.ResponseWriter, r *http.Request) {
-		if r.Host != common.APIHTTPAddr {
-			Logger.Warnf("invalid request to API server with host: %s, expect %s", r.Host, common.APIHTTPAddr)
-			http.Error(w, "invalid request", http.StatusForbidden)
+		host, _, _ := net.SplitHostPort(r.RemoteAddr)
+		if host != "127.0.0.1" && host != "localhost" && host != "[::1]" {
+			Logger.Warnf("blocked API request from %s", host)
+			http.Error(w, "forbidden", http.StatusForbidden)
 			return
 		}
 		f(w, r)

internal/api/v1/checkhealth.go

@@ -4,11 +4,10 @@ import (
 	"net/http"
 
 	. "github.com/yusing/go-proxy/internal/api/v1/utils"
-	"github.com/yusing/go-proxy/internal/config"
 	"github.com/yusing/go-proxy/internal/watcher/health"
 )
 
-func CheckHealth(cfg *config.Config, w http.ResponseWriter, r *http.Request) {
+func CheckHealth(w http.ResponseWriter, r *http.Request) {
 	target := r.FormValue("target")
 	if target == "" {
 		HandleErr(w, r, ErrMissingKey("target"), http.StatusBadRequest)

internal/api/v1/file.go

@@ -11,7 +11,7 @@ import (
 	"github.com/yusing/go-proxy/internal/common"
 	"github.com/yusing/go-proxy/internal/config"
 	E "github.com/yusing/go-proxy/internal/error"
-	"github.com/yusing/go-proxy/internal/proxy/provider"
+	"github.com/yusing/go-proxy/internal/route/provider"
 )
 
 func GetFileContent(w http.ResponseWriter, r *http.Request) {

internal/api/v1/list.go

@@ -9,19 +9,21 @@ import (
 	"github.com/yusing/go-proxy/internal/config"
 	"github.com/yusing/go-proxy/internal/net/http/middleware"
 	"github.com/yusing/go-proxy/internal/route"
+	"github.com/yusing/go-proxy/internal/task"
 	"github.com/yusing/go-proxy/internal/utils"
 )
 
 const (
-	ListRoutes          = "routes"
-	ListConfigFiles     = "config_files"
-	ListMiddlewares     = "middlewares"
-	ListMiddlewareTrace = "middleware_trace"
-	ListMatchDomains    = "match_domains"
-	ListHomepageConfig  = "homepage_config"
+	ListRoutes           = "routes"
+	ListConfigFiles      = "config_files"
+	ListMiddlewares      = "middlewares"
+	ListMiddlewareTraces = "middleware_trace"
+	ListMatchDomains     = "match_domains"
+	ListHomepageConfig   = "homepage_config"
+	ListTasks            = "tasks"
 )
 
-func List(cfg *config.Config, w http.ResponseWriter, r *http.Request) {
+func List(w http.ResponseWriter, r *http.Request) {
 	what := r.PathValue("what")
 	if what == "" {
 		what = ListRoutes
@@ -29,27 +31,24 @@ func List(cfg *config.Config, w http.ResponseWriter, r *http.Request) {
 
 	switch what {
 	case ListRoutes:
-		listRoutes(cfg, w, r)
+		U.RespondJSON(w, r, config.RoutesByAlias(route.RouteType(r.FormValue("type"))))
 	case ListConfigFiles:
 		listConfigFiles(w, r)
 	case ListMiddlewares:
-		listMiddlewares(w, r)
-	case ListMiddlewareTrace:
-		listMiddlewareTrace(w, r)
+		U.RespondJSON(w, r, middleware.All())
+	case ListMiddlewareTraces:
+		U.RespondJSON(w, r, middleware.GetAllTrace())
 	case ListMatchDomains:
-		listMatchDomains(cfg, w, r)
+		U.RespondJSON(w, r, config.Value().MatchDomains)
 	case ListHomepageConfig:
-		listHomepageConfig(cfg, w, r)
+		U.RespondJSON(w, r, config.HomepageConfig())
+	case ListTasks:
+		U.RespondJSON(w, r, task.DebugTaskMap())
 	default:
 		U.HandleErr(w, r, U.ErrInvalidKey("what"), http.StatusBadRequest)
 	}
 }
 
-func listRoutes(cfg *config.Config, w http.ResponseWriter, r *http.Request) {
-	routes := cfg.RoutesByAlias(route.RouteType(r.FormValue("type")))
-	U.RespondJSON(w, r, routes)
-}
-
 func listConfigFiles(w http.ResponseWriter, r *http.Request) {
 	files, err := utils.ListFiles(common.ConfigBasePath, 1)
 	if err != nil {
@@ -61,19 +60,3 @@ func listConfigFiles(w http.ResponseWriter, r *http.Request) {
 	}
 	U.RespondJSON(w, r, files)
 }
-
-func listMiddlewareTrace(w http.ResponseWriter, r *http.Request) {
-	U.RespondJSON(w, r, middleware.GetAllTrace())
-}
-
-func listMiddlewares(w http.ResponseWriter, r *http.Request) {
-	U.RespondJSON(w, r, middleware.All())
-}
-
-func listMatchDomains(cfg *config.Config, w http.ResponseWriter, r *http.Request) {
-	U.RespondJSON(w, r, cfg.Value().MatchDomains)
-}
-
-func listHomepageConfig(cfg *config.Config, w http.ResponseWriter, r *http.Request) {
-	U.RespondJSON(w, r, cfg.HomepageConfig())
-}

internal/api/v1/query/query.go

@@ -34,36 +34,34 @@ func ReloadServer() E.NestedError {
 	return nil
 }
 
-func ListRoutes() (map[string]map[string]any, E.NestedError) {
-	resp, err := U.Get(fmt.Sprintf("%s/v1/list/%s", common.APIHTTPURL, v1.ListRoutes))
+func List[T any](what string) (_ T, outErr E.NestedError) {
+	resp, err := U.Get(fmt.Sprintf("%s/v1/list/%s", common.APIHTTPURL, what))
 	if err != nil {
-		return nil, E.From(err)
+		outErr = E.From(err)
+		return
 	}
 	defer resp.Body.Close()
 	if resp.StatusCode != http.StatusOK {
-		return nil, E.Failure("list routes").Extraf("status code: %v", resp.StatusCode)
+		outErr = E.Failure("list "+what).Extraf("status code: %v", resp.StatusCode)
+		return
 	}
-	var routes map[string]map[string]any
-	err = json.NewDecoder(resp.Body).Decode(&routes)
+	var res T
+	err = json.NewDecoder(resp.Body).Decode(&res)
 	if err != nil {
-		return nil, E.From(err)
+		outErr = E.From(err)
+		return
 	}
-	return routes, nil
+	return res, nil
+}
+
+func ListRoutes() (map[string]map[string]any, E.NestedError) {
+	return List[map[string]map[string]any](v1.ListRoutes)
 }
 
 func ListMiddlewareTraces() (middleware.Traces, E.NestedError) {
-	resp, err := U.Get(fmt.Sprintf("%s/v1/list/%s", common.APIHTTPURL, v1.ListMiddlewareTrace))
-	if err != nil {
-		return nil, E.From(err)
-	}
-	defer resp.Body.Close()
-	if resp.StatusCode != http.StatusOK {
-		return nil, E.Failure("list middleware trace").Extraf("status code: %v", resp.StatusCode)
-	}
-	var traces middleware.Traces
-	err = json.NewDecoder(resp.Body).Decode(&traces)
-	if err != nil {
-		return nil, E.From(err)
-	}
-	return traces, nil
+	return List[middleware.Traces](v1.ListMiddlewareTraces)
+}
+
+func DebugListTasks() (map[string]any, E.NestedError) {
+	return List[map[string]any](v1.ListTasks)
 }

internal/api/v1/reload.go

@@ -7,8 +7,8 @@ import (
 	"github.com/yusing/go-proxy/internal/config"
 )
 
-func Reload(cfg *config.Config, w http.ResponseWriter, r *http.Request) {
-	if err := cfg.Reload(); err != nil {
+func Reload(w http.ResponseWriter, r *http.Request) {
+	if err := config.Reload(); err != nil {
 		U.RespondJSON(w, r, err.JSONObject(), http.StatusInternalServerError)
 	} else {
 		w.WriteHeader(http.StatusOK)

internal/api/v1/stats.go

@@ -14,19 +14,19 @@ import (
 	"github.com/yusing/go-proxy/internal/utils"
 )
 
-func Stats(cfg *config.Config, w http.ResponseWriter, r *http.Request) {
-	U.RespondJSON(w, r, getStats(cfg))
+func Stats(w http.ResponseWriter, r *http.Request) {
+	U.RespondJSON(w, r, getStats())
 }
 
-func StatsWS(cfg *config.Config, w http.ResponseWriter, r *http.Request) {
+func StatsWS(w http.ResponseWriter, r *http.Request) {
 	localAddresses := []string{"127.0.0.1", "10.0.*.*", "172.16.*.*", "192.168.*.*"}
-	originPats := make([]string, len(cfg.Value().MatchDomains)+len(localAddresses))
+	originPats := make([]string, len(config.Value().MatchDomains)+len(localAddresses))
 
 	if len(originPats) == 0 {
 		U.Logger.Warnf("no match domains configured, accepting websocket request from all origins")
 		originPats = []string{"*"}
 	} else {
-		for i, domain := range cfg.Value().MatchDomains {
+		for i, domain := range config.Value().MatchDomains {
 			originPats[i] = "*." + domain
 		}
 		originPats = append(originPats, localAddresses...)
@@ -51,7 +51,7 @@ func StatsWS(cfg *config.Config, w http.ResponseWriter, r *http.Request) {
 	defer ticker.Stop()
 
 	for range ticker.C {
-		stats := getStats(cfg)
+		stats := getStats()
 		if err := wsjson.Write(ctx, conn, stats); err != nil {
 			U.Logger.Errorf("/stats/ws failed to write JSON: %s", err)
 			return
@@ -59,9 +59,9 @@ func StatsWS(cfg *config.Config, w http.ResponseWriter, r *http.Request) {
 	}
 }
 
-func getStats(cfg *config.Config) map[string]any {
+func getStats() map[string]any {
 	return map[string]any{
-		"proxies": cfg.Statistics(),
+		"proxies": config.Statistics(),
 		"uptime":  utils.FormatDuration(server.GetProxyServer().Uptime()),
 	}
 }

internal/autocert/config.go

@@ -9,7 +9,7 @@ import (
 	"github.com/go-acme/lego/v4/lego"
 	E "github.com/yusing/go-proxy/internal/error"
 
-	"github.com/yusing/go-proxy/internal/types"
+	"github.com/yusing/go-proxy/internal/config/types"
 )
 
 type Config types.AutoCertConfig

internal/autocert/provider.go

@@ -13,9 +13,9 @@ import (
 	"github.com/go-acme/lego/v4/challenge"
 	"github.com/go-acme/lego/v4/lego"
 	"github.com/go-acme/lego/v4/registration"
-	"github.com/yusing/go-proxy/internal/common"
+	"github.com/yusing/go-proxy/internal/config/types"
 	E "github.com/yusing/go-proxy/internal/error"
-	"github.com/yusing/go-proxy/internal/types"
+	"github.com/yusing/go-proxy/internal/task"
 	U "github.com/yusing/go-proxy/internal/utils"
 )
 
@@ -140,23 +140,22 @@ func (p *Provider) ScheduleRenewal() {
 	if p.GetName() == ProviderLocal {
 		return
 	}
-
-	ticker := time.NewTicker(5 * time.Second)
-	defer ticker.Stop()
-
-	task := common.NewTask("cert renew scheduler")
-	defer task.Finished()
-
-	for {
-		select {
-		case <-task.Context().Done():
-			return
-		case <-ticker.C: // check every 5 seconds
-			if err := p.renewIfNeeded(); err.HasError() {
-				logger.Warn(err)
+	go func() {
+		task := task.GlobalTask("cert renew scheduler")
+		ticker := time.NewTicker(5 * time.Second)
+		defer ticker.Stop()
+		defer task.Finish("cert renew scheduler stopped")
+		for {
+			select {
+			case <-task.Context().Done():
+				return
+			case <-ticker.C: // check every 5 seconds
+				if err := p.renewIfNeeded(); err.HasError() {
+					logger.Warn(err)
+				}
 			}
 		}
-	}
+	}()
 }
 
 func (p *Provider) initClient() E.NestedError {

internal/autocert/setup.go

@@ -17,7 +17,7 @@ func (p *Provider) Setup() (err E.NestedError) {
 		}
 	}
 
-	go p.ScheduleRenewal()
+	p.ScheduleRenewal()
 
 	for _, expiry := range p.GetExpiries() {
 		logger.Infof("certificate expire on %s", expiry)

internal/common/args.go

@@ -22,6 +22,7 @@ const (
 	CommandDebugListEntries   = "debug-ls-entries"
 	CommandDebugListProviders = "debug-ls-providers"
 	CommandDebugListMTrace    = "debug-ls-mtrace"
+	CommandDebugListTasks     = "debug-ls-tasks"
 )
 
 var ValidCommands = []string{
@@ -35,6 +36,7 @@ var ValidCommands = []string{
 	CommandDebugListEntries,
 	CommandDebugListProviders,
 	CommandDebugListMTrace,
+	CommandDebugListTasks,
 }
 
 func GetArgs() Args {

internal/common/constants.go

@@ -43,7 +43,6 @@ const (
 	HealthCheckIntervalDefault = 5 * time.Second
 	HealthCheckTimeoutDefault  = 5 * time.Second
 
-	IdleTimeoutDefault = "0"
 	WakeTimeoutDefault = "30s"
 	StopTimeoutDefault = "10s"
 	StopMethodDefault  = "stop"

internal/common/env.go

@@ -15,6 +15,7 @@ var (
 	NoSchemaValidation = GetEnvBool("GOPROXY_NO_SCHEMA_VALIDATION", true)
 	IsTest             = GetEnvBool("GOPROXY_TEST", false) || strings.HasSuffix(os.Args[0], ".test")
 	IsDebug            = GetEnvBool("GOPROXY_DEBUG", IsTest)
+	IsTrace            = GetEnvBool("GOPROXY_TRACE", false) && IsDebug
 
 	ProxyHTTPAddr,
 	ProxyHTTPHost,

internal/common/task.go

@@ -1,224 +0,0 @@
-package common
-
-import (
-	"context"
-	"fmt"
-	"strings"
-	"sync"
-	"time"
-
-	"github.com/puzpuzpuz/xsync/v3"
-	"github.com/sirupsen/logrus"
-)
-
-var (
-	globalCtx, globalCtxCancel = context.WithCancel(context.Background())
-	taskWg                     sync.WaitGroup
-	tasksMap                   = xsync.NewMapOf[*task, struct{}]()
-)
-
-type (
-	Task interface {
-		Name() string
-		Context() context.Context
-		Subtask(usageFmt string, args ...interface{}) Task
-		SubtaskWithCancel(usageFmt string, args ...interface{}) (Task, context.CancelFunc)
-		Finished()
-	}
-	task struct {
-		ctx      context.Context
-		subtasks []*task
-		name     string
-		finished bool
-		mu       sync.Mutex
-	}
-)
-
-func (t *task) Name() string {
-	return t.name
-}
-
-// Context returns the context associated with the task. This context is
-// canceled when the task is finished.
-func (t *task) Context() context.Context {
-	return t.ctx
-}
-
-// Finished marks the task as finished and notifies the global wait group.
-// Finished is thread-safe and idempotent.
-func (t *task) Finished() {
-	t.mu.Lock()
-	defer t.mu.Unlock()
-
-	if t.finished {
-		return
-	}
-	t.finished = true
-	if _, ok := tasksMap.Load(t); ok {
-		taskWg.Done()
-		tasksMap.Delete(t)
-	}
-	logrus.Debugf("task %q finished", t.Name())
-}
-
-// Subtask returns a new subtask with the given name, derived from the receiver's context.
-//
-// The returned subtask is associated with the receiver's context and will be
-// automatically registered and deregistered from the global task wait group.
-//
-// If the receiver's context is already canceled, the returned subtask will be
-// canceled immediately.
-//
-// The returned subtask is safe for concurrent use.
-func (t *task) Subtask(format string, args ...interface{}) Task {
-	if len(args) > 0 {
-		format = fmt.Sprintf(format, args...)
-	}
-	t.mu.Lock()
-	defer t.mu.Unlock()
-	sub := newSubTask(t.ctx, format)
-	t.subtasks = append(t.subtasks, sub)
-	return sub
-}
-
-// SubtaskWithCancel returns a new subtask with the given name, derived from the receiver's context,
-// and a cancel function. The returned subtask is associated with the receiver's context and will be
-// automatically registered and deregistered from the global task wait group.
-//
-// If the receiver's context is already canceled, the returned subtask will be canceled immediately.
-//
-// The returned cancel function is safe for concurrent use, and can be used to cancel the returned
-// subtask at any time.
-func (t *task) SubtaskWithCancel(format string, args ...interface{}) (Task, context.CancelFunc) {
-	if len(args) > 0 {
-		format = fmt.Sprintf(format, args...)
-	}
-	t.mu.Lock()
-	defer t.mu.Unlock()
-	ctx, cancel := context.WithCancel(t.ctx)
-	sub := newSubTask(ctx, format)
-	t.subtasks = append(t.subtasks, sub)
-	return sub, cancel
-}
-
-func (t *task) tree(prefix ...string) string {
-	var sb strings.Builder
-	var pre string
-	if len(prefix) > 0 {
-		pre = prefix[0]
-	}
-	sb.WriteString(pre)
-	sb.WriteString(t.Name() + "\n")
-	for _, sub := range t.subtasks {
-		if sub.finished {
-			continue
-		}
-		sb.WriteString(sub.tree(pre + "  "))
-	}
-	return sb.String()
-}
-
-func newSubTask(ctx context.Context, name string) *task {
-	t := &task{
-		ctx:  ctx,
-		name: name,
-	}
-	tasksMap.Store(t, struct{}{})
-	taskWg.Add(1)
-	logrus.Debugf("task %q started", name)
-	return t
-}
-
-// NewTask returns a new Task with the given name, derived from the global
-// context.
-//
-// The returned Task is associated with the global context and will be
-// automatically registered and deregistered from the global context's wait
-// group.
-//
-// If the global context is already canceled, the returned Task will be
-// canceled immediately.
-//
-// The returned Task is not safe for concurrent use.
-func NewTask(format string, args ...interface{}) Task {
-	if len(args) > 0 {
-		format = fmt.Sprintf(format, args...)
-	}
-	return newSubTask(globalCtx, format)
-}
-
-// NewTaskWithCancel returns a new Task with the given name, derived from the
-// global context, and a cancel function. The returned Task is associated with
-// the global context and will be automatically registered and deregistered
-// from the global task wait group.
-//
-// If the global context is already canceled, the returned Task will be
-// canceled immediately.
-//
-// The returned Task is safe for concurrent use.
-//
-// The returned cancel function is safe for concurrent use, and can be used
-// to cancel the returned Task at any time.
-func NewTaskWithCancel(format string, args ...interface{}) (Task, context.CancelFunc) {
-	subCtx, cancel := context.WithCancel(globalCtx)
-	if len(args) > 0 {
-		format = fmt.Sprintf(format, args...)
-	}
-	return newSubTask(subCtx, format), cancel
-}
-
-// GlobalTask returns a new Task with the given name, associated with the
-// global context.
-//
-// Unlike NewTask, GlobalTask does not automatically register or deregister
-// the Task with the global task wait group. The returned Task is not
-// started, but the name is formatted immediately.
-//
-// This is best used for main task that do not need to wait and
-// will create a bunch of subtasks.
-//
-// The returned Task is safe for concurrent use.
-func GlobalTask(format string, args ...interface{}) Task {
-	if len(args) > 0 {
-		format = fmt.Sprintf(format, args...)
-	}
-	return &task{
-		ctx:  globalCtx,
-		name: format,
-	}
-}
-
-// CancelGlobalContext cancels the global context, which will cause all tasks
-// created by GlobalTask or NewTask to be canceled. This should be called
-// before exiting the program to ensure that all tasks are properly cleaned
-// up.
-func CancelGlobalContext() {
-	globalCtxCancel()
-}
-
-// GlobalContextWait waits for all tasks to finish, up to the given timeout.
-//
-// If the timeout is exceeded, it prints a list of all tasks that were
-// still running when the timeout was reached, and their current tree
-// of subtasks.
-func GlobalContextWait(timeout time.Duration) {
-	done := make(chan struct{})
-	after := time.After(timeout)
-	go func() {
-		taskWg.Wait()
-		close(done)
-	}()
-	for {
-		select {
-		case <-done:
-			return
-		case <-after:
-			logrus.Warnln("Timeout waiting for these tasks to finish:")
-			tasksMap.Range(func(t *task, _ struct{}) bool {
-				logrus.Warnln(t.tree())
-				return true
-			})
-			return
-		}
-	}
-}

internal/config/config.go

@@ -2,51 +2,66 @@ package config
 
 import (
 	"os"
+	"sync"
+	"time"
 
 	"github.com/sirupsen/logrus"
 	"github.com/yusing/go-proxy/internal/autocert"
 	"github.com/yusing/go-proxy/internal/common"
+	"github.com/yusing/go-proxy/internal/config/types"
 	E "github.com/yusing/go-proxy/internal/error"
-	PR "github.com/yusing/go-proxy/internal/proxy/provider"
-	R "github.com/yusing/go-proxy/internal/route"
-	"github.com/yusing/go-proxy/internal/types"
+	"github.com/yusing/go-proxy/internal/route"
+	proxy "github.com/yusing/go-proxy/internal/route/provider"
+	"github.com/yusing/go-proxy/internal/task"
 	U "github.com/yusing/go-proxy/internal/utils"
 	F "github.com/yusing/go-proxy/internal/utils/functional"
-	W "github.com/yusing/go-proxy/internal/watcher"
+	"github.com/yusing/go-proxy/internal/watcher"
 	"github.com/yusing/go-proxy/internal/watcher/events"
 	"gopkg.in/yaml.v3"
 )
 
 type Config struct {
 	value            *types.Config
-	proxyProviders   F.Map[string, *PR.Provider]
+	providers        F.Map[string, *proxy.Provider]
 	autocertProvider *autocert.Provider
-
-	l logrus.FieldLogger
-
-	watcher W.Watcher
-
-	reloadReq chan struct{}
+	task             task.Task
 }
 
-var instance *Config
+var (
+	instance   *Config
+	cfgWatcher watcher.Watcher
+	logger     = logrus.WithField("module", "config")
+	reloadMu   sync.Mutex
+)
+
+const configEventFlushInterval = 500 * time.Millisecond
+
+const (
+	cfgRenameWarn = `Config file renamed, not reloading.
+Make sure you rename it back before next time you start.`
+	cfgDeleteWarn = `Config file deleted, not reloading.
+You may run "ls-config" to show or dump the current config.`
+)
 
 func GetInstance() *Config {
 	return instance
 }
 
-func Load() E.NestedError {
+func newConfig() *Config {
+	return &Config{
+		value:     types.DefaultConfig(),
+		providers: F.NewMapOf[string, *proxy.Provider](),
+		task:      task.GlobalTask("config"),
+	}
+}
+
+func Load() (*Config, E.NestedError) {
 	if instance != nil {
-		return nil
+		return instance, nil
 	}
-	instance = &Config{
-		value:          types.DefaultConfig(),
-		proxyProviders: F.NewMapOf[string, *PR.Provider](),
-		l:              logrus.WithField("module", "config"),
-		watcher:        W.NewConfigFileWatcher(common.ConfigFileName),
-		reloadReq:      make(chan struct{}, 1),
-	}
-	return instance.load()
+	instance = newConfig()
+	cfgWatcher = watcher.NewConfigFileWatcher(common.ConfigFileName)
+	return instance, instance.load()
 }
 
 func Validate(data []byte) E.NestedError {
@@ -54,87 +69,90 @@ func Validate(data []byte) E.NestedError {
 }
 
 func MatchDomains() []string {
-	if instance == nil {
-		logrus.Panic("config has not been loaded, please check if there is any errors")
-	}
 	return instance.value.MatchDomains
 }
 
-func (cfg *Config) Value() types.Config {
-	if cfg == nil {
-		logrus.Panic("config has not been loaded, please check if there is any errors")
-	}
-	return *cfg.value
+func WatchChanges() {
+	task := task.GlobalTask("Config watcher")
+	eventQueue := events.NewEventQueue(
+		task,
+		configEventFlushInterval,
+		OnConfigChange,
+		func(err E.NestedError) {
+			logger.Error(err)
+		},
+	)
+	eventQueue.Start(cfgWatcher.Events(task.Context()))
 }
 
-func (cfg *Config) GetAutoCertProvider() *autocert.Provider {
-	if instance == nil {
-		logrus.Panic("config has not been loaded, please check if there is any errors")
+func OnConfigChange(flushTask task.Task, ev []events.Event) {
+	defer flushTask.Finish("config reload complete")
+
+	// no matter how many events during the interval
+	// just reload once and check the last event
+	switch ev[len(ev)-1].Action {
+	case events.ActionFileRenamed:
+		logger.Warn(cfgRenameWarn)
+		return
+	case events.ActionFileDeleted:
+		logger.Warn(cfgDeleteWarn)
+		return
+	}
+
+	if err := Reload(); err != nil {
+		logger.Error(err)
 	}
-	return cfg.autocertProvider
 }
 
-func (cfg *Config) Reload() (err E.NestedError) {
-	cfg.stopProviders()
-	err = cfg.load()
-	cfg.StartProxyProviders()
-	return
+func Reload() E.NestedError {
+	// avoid race between config change and API reload request
+	reloadMu.Lock()
+	defer reloadMu.Unlock()
+
+	newCfg := newConfig()
+	err := newCfg.load()
+	if err != nil {
+		return err
+	}
+
+	// cancel all current subtasks -> wait
+	// -> replace config -> start new subtasks
+	instance.task.Finish("config changed")
+	instance.task.Wait()
+	*instance = *newCfg
+	instance.StartProxyProviders()
+	return nil
+}
+
+func Value() types.Config {
+	return *instance.value
+}
+
+func GetAutoCertProvider() *autocert.Provider {
+	return instance.autocertProvider
+}
+
+func (cfg *Config) Task() task.Task {
+	return cfg.task
 }
 
 func (cfg *Config) StartProxyProviders() {
-	cfg.controlProviders("start", (*PR.Provider).StartAllRoutes)
-}
-
-func (cfg *Config) WatchChanges() {
-	task := common.NewTask("Config watcher")
-	go func() {
-		defer task.Finished()
-		for {
-			select {
-			case <-task.Context().Done():
-				return
-			case <-cfg.reloadReq:
-				if err := cfg.Reload(); err != nil {
-					cfg.l.Error(err)
-				}
-			}
-		}
-	}()
-	go func() {
-		eventCh, errCh := cfg.watcher.Events(task.Context())
-		for {
-			select {
-			case <-task.Context().Done():
-				return
-			case event := <-eventCh:
-				if event.Action == events.ActionFileDeleted || event.Action == events.ActionFileRenamed {
-					cfg.l.Error("config file deleted or renamed, ignoring...")
-					continue
-				} else {
-					cfg.reloadReq <- struct{}{}
-				}
-			case err := <-errCh:
-				cfg.l.Error(err)
-				continue
-			}
-		}
-	}()
-}
-
-func (cfg *Config) forEachRoute(do func(alias string, r *R.Route, p *PR.Provider)) {
-	cfg.proxyProviders.RangeAll(func(_ string, p *PR.Provider) {
-		p.RangeRoutes(func(a string, r *R.Route) {
-			do(a, r, p)
-		})
+	b := E.NewBuilder("errors starting providers")
+	cfg.providers.RangeAllParallel(func(_ string, p *proxy.Provider) {
+		b.Add(p.Start(cfg.task.Subtask("provider %s", p.GetName())))
 	})
+
+	if b.HasError() {
+		logger.Error(b.Build())
+	}
 }
 
 func (cfg *Config) load() (res E.NestedError) {
 	b := E.NewBuilder("errors loading config")
 	defer b.To(&res)
 
-	cfg.l.Debug("loading config")
-	defer cfg.l.Debug("loaded config")
+	logger.Debug("loading config")
+	defer logger.Debug("loaded config")
 
 	data, err := E.Check(os.ReadFile(common.ConfigPath))
 	if err != nil {
@@ -160,7 +178,7 @@ func (cfg *Config) load() (res E.NestedError) {
 	b.Add(cfg.loadProviders(&model.Providers))
 
 	cfg.value = model
-	R.SetFindMuxDomains(model.MatchDomains)
+	route.SetFindMuxDomains(model.MatchDomains)
 	return
 }
 
@@ -169,8 +187,8 @@ func (cfg *Config) initAutoCert(autocertCfg *types.AutoCertConfig) (err E.Nested
 		return
 	}
 
-	cfg.l.Debug("initializing autocert")
-	defer cfg.l.Debug("initialized autocert")
+	logger.Debug("initializing autocert")
+	defer logger.Debug("initialized autocert")
 
 	cfg.autocertProvider, err = autocert.NewConfig(autocertCfg).GetProvider()
 	if err != nil {
@@ -179,48 +197,34 @@ func (cfg *Config) initAutoCert(autocertCfg *types.AutoCertConfig) (err E.Nested
 	return
 }
 
-func (cfg *Config) loadProviders(providers *types.ProxyProviders) (res E.NestedError) {
-	cfg.l.Debug("loading providers")
-	defer cfg.l.Debug("loaded providers")
+func (cfg *Config) loadProviders(providers *types.ProxyProviders) (outErr E.NestedError) {
+	subtask := cfg.task.Subtask("load providers")
+	defer subtask.Finish("done")
 
-	b := E.NewBuilder("errors loading providers")
-	defer b.To(&res)
+	errs := E.NewBuilder("errors loading providers")
+	results := E.NewBuilder("loaded providers")
+	defer errs.To(&outErr)
 
 	for _, filename := range providers.Files {
-		p, err := PR.NewFileProvider(filename)
+		p, err := proxy.NewFileProvider(filename)
 		if err != nil {
-			b.Add(err.Subject(filename))
+			errs.Add(err)
 			continue
 		}
-		cfg.proxyProviders.Store(p.GetName(), p)
-		b.Add(p.LoadRoutes().Subject(filename))
+		cfg.providers.Store(p.GetName(), p)
+		errs.Add(p.LoadRoutes().Subject(filename))
+		results.Addf("%d routes from %s", p.NumRoutes(), filename)
 	}
 	for name, dockerHost := range providers.Docker {
-		p, err := PR.NewDockerProvider(name, dockerHost)
+		p, err := proxy.NewDockerProvider(name, dockerHost)
 		if err != nil {
-			b.Add(err.Subjectf("%s (%s)", name, dockerHost))
+			errs.Add(err.Subjectf("%s (%s)", name, dockerHost))
 			continue
 		}
-		cfg.proxyProviders.Store(p.GetName(), p)
-		b.Add(p.LoadRoutes().Subject(p.GetName()))
+		cfg.providers.Store(p.GetName(), p)
+		errs.Add(p.LoadRoutes().Subject(p.GetName()))
+		results.Addf("%d routes from %s", p.NumRoutes(), name)
 	}
+	logger.Info(results.Build())
 	return
 }
-
-func (cfg *Config) controlProviders(action string, do func(*PR.Provider) E.NestedError) {
-	errors := E.NewBuilder("errors in %s these providers", action)
-
-	cfg.proxyProviders.RangeAllParallel(func(name string, p *PR.Provider) {
-		if err := do(p); err != nil {
-			errors.Add(err.Subject(p))
-		}
-	})
-
-	if err := errors.Build(); err != nil {
-		cfg.l.Error(err)
-	}
-}
-
-func (cfg *Config) stopProviders() {
-	cfg.controlProviders("stop routes", (*PR.Provider).StopAllRoutes)
-}

internal/config/query.go

@@ -6,33 +6,35 @@ import (
 
 	"github.com/yusing/go-proxy/internal/common"
 	"github.com/yusing/go-proxy/internal/homepage"
-	PR "github.com/yusing/go-proxy/internal/proxy/provider"
-	R "github.com/yusing/go-proxy/internal/route"
-	"github.com/yusing/go-proxy/internal/types"
+	"github.com/yusing/go-proxy/internal/proxy/entry"
+	"github.com/yusing/go-proxy/internal/route"
+	proxy "github.com/yusing/go-proxy/internal/route/provider"
 	U "github.com/yusing/go-proxy/internal/utils"
 	F "github.com/yusing/go-proxy/internal/utils/functional"
 )
 
-func (cfg *Config) DumpEntries() map[string]*types.RawEntry {
-	entries := make(map[string]*types.RawEntry)
-	cfg.forEachRoute(func(alias string, r *R.Route, p *PR.Provider) {
-		entries[alias] = r.Entry
+func DumpEntries() map[string]*entry.RawEntry {
+	entries := make(map[string]*entry.RawEntry)
+	instance.providers.RangeAll(func(_ string, p *proxy.Provider) {
+		p.RangeRoutes(func(alias string, r *route.Route) {
+			entries[alias] = r.Entry
+		})
 	})
 	return entries
 }
 
-func (cfg *Config) DumpProviders() map[string]*PR.Provider {
-	entries := make(map[string]*PR.Provider)
-	cfg.proxyProviders.RangeAll(func(name string, p *PR.Provider) {
+func DumpProviders() map[string]*proxy.Provider {
+	entries := make(map[string]*proxy.Provider)
+	instance.providers.RangeAll(func(name string, p *proxy.Provider) {
 		entries[name] = p
 	})
 	return entries
 }
 
-func (cfg *Config) HomepageConfig() homepage.Config {
+func HomepageConfig() homepage.Config {
 	var proto, port string
-	domains := cfg.value.MatchDomains
-	cert, _ := cfg.autocertProvider.GetCert(nil)
+	domains := instance.value.MatchDomains
+	cert, _ := instance.autocertProvider.GetCert(nil)
 	if cert != nil {
 		proto = "https"
 		port = common.ProxyHTTPSPort
@@ -42,9 +44,9 @@ func (cfg *Config) HomepageConfig() homepage.Config {
 	}
 
 	hpCfg := homepage.NewHomePageConfig()
-	R.GetReverseProxies().RangeAll(func(alias string, r *R.HTTPRoute) {
-		entry := r.Raw
-		item := entry.Homepage
+	route.GetReverseProxies().RangeAll(func(alias string, r *route.HTTPRoute) {
+		en := r.Raw
+		item := en.Homepage
 		if item == nil {
 			item = new(homepage.Item)
 			item.Show = true
@@ -63,12 +65,12 @@ func (cfg *Config) HomepageConfig() homepage.Config {
 			)
 		}
 
-		if r.IsDocker() {
+		if entry.IsDocker(r) {
 			if item.Category == "" {
 				item.Category = "Docker"
 			}
-			item.SourceType = string(PR.ProviderTypeDocker)
-		} else if r.UseLoadBalance() {
+			item.SourceType = string(proxy.ProviderTypeDocker)
+		} else if entry.UseLoadBalance(r) {
 			if item.Category == "" {
 				item.Category = "Load-balanced"
 			}
@@ -77,7 +79,7 @@ func (cfg *Config) HomepageConfig() homepage.Config {
 			if item.Category == "" {
 				item.Category = "Others"
 			}
-			item.SourceType = string(PR.ProviderTypeFile)
+			item.SourceType = string(proxy.ProviderTypeFile)
 		}
 
 		if item.URL == "" {
@@ -85,26 +87,26 @@ func (cfg *Config) HomepageConfig() homepage.Config {
 				item.URL = fmt.Sprintf("%s://%s.%s:%s", proto, strings.ToLower(alias), domains[0], port)
 			}
 		}
-		item.AltURL = r.URL().String()
+		item.AltURL = r.TargetURL().String()
 
 		hpCfg.Add(item)
 	})
 	return hpCfg
 }
 
-func (cfg *Config) RoutesByAlias(typeFilter ...R.RouteType) map[string]any {
+func RoutesByAlias(typeFilter ...route.RouteType) map[string]any {
 	routes := make(map[string]any)
 	if len(typeFilter) == 0 || typeFilter[0] == "" {
-		typeFilter = []R.RouteType{R.RouteTypeReverseProxy, R.RouteTypeStream}
+		typeFilter = []route.RouteType{route.RouteTypeReverseProxy, route.RouteTypeStream}
 	}
 	for _, t := range typeFilter {
 		switch t {
-		case R.RouteTypeReverseProxy:
-			R.GetReverseProxies().RangeAll(func(alias string, r *R.HTTPRoute) {
+		case route.RouteTypeReverseProxy:
+			route.GetReverseProxies().RangeAll(func(alias string, r *route.HTTPRoute) {
 				routes[alias] = r
 			})
-		case R.RouteTypeStream:
-			R.GetStreamProxies().RangeAll(func(alias string, r *R.StreamRoute) {
+		case route.RouteTypeStream:
+			route.GetStreamProxies().RangeAll(func(alias string, r *route.StreamRoute) {
 				routes[alias] = r
 			})
 		}
@@ -112,12 +114,12 @@ func (cfg *Config) RoutesByAlias(typeFilter ...R.RouteType) map[string]any {
 	return routes
 }
 
-func (cfg *Config) Statistics() map[string]any {
+func Statistics() map[string]any {
 	nTotalStreams := 0
 	nTotalRPs := 0
-	providerStats := make(map[string]PR.ProviderStats)
+	providerStats := make(map[string]proxy.ProviderStats)
 
-	cfg.proxyProviders.RangeAll(func(name string, p *PR.Provider) {
+	instance.providers.RangeAll(func(name string, p *proxy.Provider) {
 		providerStats[name] = p.Statistics()
 	})
 
@@ -133,9 +135,9 @@ func (cfg *Config) Statistics() map[string]any {
 	}
 }
 
-func (cfg *Config) FindRoute(alias string) *R.Route {
-	return F.MapFind(cfg.proxyProviders,
-		func(p *PR.Provider) (*R.Route, bool) {
+func FindRoute(alias string) *route.Route {
+	return F.MapFind(instance.providers,
+		func(p *proxy.Provider) (*route.Route, bool) {
 			if route, ok := p.GetRoute(alias); ok {
 				return route, true
 			}

internal/config/types/config.go

@@ -0,0 +1,24 @@
+package types
+
+type (
+	Config struct {
+		Providers       ProxyProviders `json:"providers" yaml:",flow"`
+		AutoCert        AutoCertConfig `json:"autocert" yaml:",flow"`
+		ExplicitOnly    bool           `json:"explicit_only" yaml:"explicit_only"`
+		MatchDomains    []string       `json:"match_domains" yaml:"match_domains"`
+		TimeoutShutdown int            `json:"timeout_shutdown" yaml:"timeout_shutdown"`
+		RedirectToHTTPS bool           `json:"redirect_to_https" yaml:"redirect_to_https"`
+	}
+	ProxyProviders struct {
+		Files  []string          `json:"include" yaml:"include"` // docker, file
+		Docker map[string]string `json:"docker" yaml:"docker"`
+	}
+)
+
+func DefaultConfig() *Config {
+	return &Config{
+		Providers:       ProxyProviders{},
+		TimeoutShutdown: 3,
+		RedirectToHTTPS: false,
+	}
+}

internal/docker/client.go

@@ -9,6 +9,7 @@ import (
 	"github.com/sirupsen/logrus"
 	"github.com/yusing/go-proxy/internal/common"
 	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/task"
 	U "github.com/yusing/go-proxy/internal/utils"
 	F "github.com/yusing/go-proxy/internal/utils/functional"
 )
@@ -36,22 +37,13 @@ var (
 )
 
 func init() {
-	go func() {
-		task := common.NewTask("close all docker client")
-		defer task.Finished()
-		for {
-			select {
-			case <-task.Context().Done():
-				clientMap.RangeAllParallel(func(_ string, c Client) {
-					if c.Connected() {
-						c.Client.Close()
-					}
-				})
-				clientMap.Clear()
-				return
+	task.GlobalTask("close docker clients").OnComplete("", func() {
+		clientMap.RangeAllParallel(func(_ string, c Client) {
+			if c.Connected() {
+				c.Client.Close()
 			}
-		}
-	}()
+		})
+	})
 }
 
 func (c *SharedClient) Connected() bool {
@@ -141,19 +133,10 @@ func ConnectClient(host string) (Client, E.NestedError) {
 		<-c.refCount.Zero()
 		clientMap.Delete(c.key)
 
-		if c.Client != nil {
+		if c.Connected() {
 			c.Client.Close()
-			c.Client = nil
 			c.l.Debugf("client closed")
 		}
 	}()
 	return c, nil
 }
-
-func CloseAllClients() {
-	clientMap.RangeAllParallel(func(_ string, c Client) {
-		c.Client.Close()
-	})
-	clientMap.Clear()
-	logger.Debug("closed all clients")
-}

internal/docker/client_info.go

@@ -2,6 +2,7 @@ package docker
 
 import (
 	"context"
+	"errors"
 	"time"
 
 	"github.com/docker/docker/api/types"
@@ -16,10 +17,13 @@ type ClientInfo struct {
 }
 
 var listOptions = container.ListOptions{
+	// created|restarting|running|removing|paused|exited|dead
 	// Filters: filters.NewArgs(
-	// 	filters.Arg("health", "healthy"),
-	// 	filters.Arg("health", "none"),
-	// 	filters.Arg("health", "starting"),
+	// 	filters.Arg("status", "created"),
+	// 	filters.Arg("status", "restarting"),
+	// 	filters.Arg("status", "running"),
+	// 	filters.Arg("status", "paused"),
+	// 	filters.Arg("status", "exited"),
 	// ),
 	All: true,
 }
@@ -31,7 +35,7 @@ func GetClientInfo(clientHost string, getContainer bool) (*ClientInfo, E.NestedE
 	}
 	defer dockerClient.Close()
 
-	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	ctx, cancel := context.WithTimeoutCause(context.Background(), 3*time.Second, errors.New("docker client connection timeout"))
 	defer cancel()
 
 	var containers []types.Container

internal/docker/container.go

@@ -32,11 +32,11 @@ type (
 		IsExcluded  bool     `json:"is_excluded" yaml:"-"`
 		IsExplicit  bool     `json:"is_explicit" yaml:"-"`
 		IsDatabase  bool     `json:"is_database" yaml:"-"`
-		IdleTimeout string   `json:"idle_timeout" yaml:"-"`
-		WakeTimeout string   `json:"wake_timeout" yaml:"-"`
-		StopMethod  string   `json:"stop_method" yaml:"-"`
-		StopTimeout string   `json:"stop_timeout" yaml:"-"` // stop_method = "stop" only
-		StopSignal  string   `json:"stop_signal" yaml:"-"`  // stop_method = "stop" | "kill" only
+		IdleTimeout string   `json:"idle_timeout,omitempty" yaml:"-"`
+		WakeTimeout string   `json:"wake_timeout,omitempty" yaml:"-"`
+		StopMethod  string   `json:"stop_method,omitempty" yaml:"-"`
+		StopTimeout string   `json:"stop_timeout,omitempty" yaml:"-"` // stop_method = "stop" only
+		StopSignal  string   `json:"stop_signal,omitempty" yaml:"-"`  // stop_method = "stop" | "kill" only
 		Running     bool     `json:"running" yaml:"-"`
 	}
 )

internal/docker/idlewatcher/config/config.go

@@ -0,0 +1,112 @@
+package idlewatcher
+
+import (
+	"time"
+
+	"github.com/yusing/go-proxy/internal/docker"
+	E "github.com/yusing/go-proxy/internal/error"
+)
+
+type (
+	Config struct {
+		IdleTimeout time.Duration `json:"idle_timeout,omitempty"`
+		WakeTimeout time.Duration `json:"wake_timeout,omitempty"`
+		StopTimeout int           `json:"stop_timeout,omitempty"` // docker api takes integer seconds for timeout argument
+		StopMethod  StopMethod    `json:"stop_method,omitempty"`
+		StopSignal  Signal        `json:"stop_signal,omitempty"`
+
+		DockerHost       string `json:"docker_host,omitempty"`
+		ContainerName    string `json:"container_name,omitempty"`
+		ContainerID      string `json:"container_id,omitempty"`
+		ContainerRunning bool   `json:"container_running,omitempty"`
+	}
+	StopMethod string
+	Signal     string
+)
+
+const (
+	StopMethodPause StopMethod = "pause"
+	StopMethodStop  StopMethod = "stop"
+	StopMethodKill  StopMethod = "kill"
+)
+
+func ValidateConfig(cont *docker.Container) (cfg *Config, res E.NestedError) {
+	if cont == nil {
+		return nil, nil
+	}
+
+	if cont.IdleTimeout == "" {
+		return &Config{
+			DockerHost:       cont.DockerHost,
+			ContainerName:    cont.ContainerName,
+			ContainerID:      cont.ContainerID,
+			ContainerRunning: cont.Running,
+		}, nil
+	}
+
+	b := E.NewBuilder("invalid idlewatcher config")
+	defer b.To(&res)
+
+	idleTimeout, err := validateDurationPostitive(cont.IdleTimeout)
+	b.Add(err.Subjectf("%s", "idle_timeout"))
+
+	wakeTimeout, err := validateDurationPostitive(cont.WakeTimeout)
+	b.Add(err.Subjectf("%s", "wake_timeout"))
+
+	stopTimeout, err := validateDurationPostitive(cont.StopTimeout)
+	b.Add(err.Subjectf("%s", "stop_timeout"))
+
+	stopMethod, err := validateStopMethod(cont.StopMethod)
+	b.Add(err)
+
+	signal, err := validateSignal(cont.StopSignal)
+	b.Add(err)
+
+	if err := b.Build(); err != nil {
+		return
+	}
+
+	return &Config{
+		IdleTimeout: idleTimeout,
+		WakeTimeout: wakeTimeout,
+		StopTimeout: int(stopTimeout.Seconds()),
+		StopMethod:  stopMethod,
+		StopSignal:  signal,
+
+		DockerHost:       cont.DockerHost,
+		ContainerName:    cont.ContainerName,
+		ContainerID:      cont.ContainerID,
+		ContainerRunning: cont.Running,
+	}, nil
+}
+
+func validateDurationPostitive(value string) (time.Duration, E.NestedError) {
+	d, err := time.ParseDuration(value)
+	if err != nil {
+		return 0, E.Invalid("duration", value).With(err)
+	}
+	if d < 0 {
+		return 0, E.Invalid("duration", "negative value")
+	}
+	return d, nil
+}
+
+func validateSignal(s string) (Signal, E.NestedError) {
+	switch s {
+	case "", "SIGINT", "SIGTERM", "SIGHUP", "SIGQUIT",
+		"INT", "TERM", "HUP", "QUIT":
+		return Signal(s), nil
+	}
+
+	return "", E.Invalid("signal", s)
+}
+
+func validateStopMethod(s string) (StopMethod, E.NestedError) {
+	sm := StopMethod(s)
+	switch sm {
+	case StopMethodPause, StopMethodStop, StopMethodKill:
+		return sm, nil
+	default:
+		return "", E.Invalid("stop_method", sm)
+	}
+}

internal/docker/idlewatcher/loading_page.go

@@ -20,16 +20,15 @@ var loadingPageTmpl = template.Must(template.New("loading_page").Parse(string(lo
 
 const headerCheckRedirect = "X-Goproxy-Check-Redirect"
 
-func (w *Watcher) makeRespBody(format string, args ...any) []byte {
-	msg := fmt.Sprintf(format, args...)
+func (w *Watcher) makeLoadingPageBody() []byte {
+	msg := fmt.Sprintf("%s is starting...", w.ContainerName)
 
 	data := new(templateData)
 	data.CheckRedirectHeader = headerCheckRedirect
 	data.Title = w.ContainerName
-	data.Message = strings.ReplaceAll(msg, "\n", "<br>")
-	data.Message = strings.ReplaceAll(data.Message, " ", "&ensp;")
+	data.Message = strings.ReplaceAll(msg, " ", "&ensp;")
 
-	buf := bytes.NewBuffer(make([]byte, 128)) // more than enough
+	buf := bytes.NewBuffer(make([]byte, len(loadingPage)+len(data.Title)+len(data.Message)+len(headerCheckRedirect)))
 	err := loadingPageTmpl.Execute(buf, data)
 	if err != nil { // should never happen in production
 		panic(err)

internal/docker/idlewatcher/waker.go

@@ -1,197 +1,133 @@
 package idlewatcher
 
 import (
-	"context"
 	"net/http"
-	"strconv"
+	"sync/atomic"
 	"time"
 
-	"github.com/sirupsen/logrus"
 	E "github.com/yusing/go-proxy/internal/error"
 	gphttp "github.com/yusing/go-proxy/internal/net/http"
-	"github.com/yusing/go-proxy/internal/net/types"
+	net "github.com/yusing/go-proxy/internal/net/types"
+	"github.com/yusing/go-proxy/internal/proxy/entry"
+	"github.com/yusing/go-proxy/internal/task"
+	U "github.com/yusing/go-proxy/internal/utils"
 	"github.com/yusing/go-proxy/internal/watcher/health"
 )
 
-type Waker struct {
-	*Watcher
+type Waker interface {
+	health.HealthMonitor
+	http.Handler
+	net.Stream
+}
+
+type waker struct {
+	_ U.NoCopy
 
-	client *http.Client
 	rp     *gphttp.ReverseProxy
+	stream net.Stream
+	hc     health.HealthChecker
+
+	ready atomic.Bool
 }
 
-func NewWaker(w *Watcher, rp *gphttp.ReverseProxy) *Waker {
-	return &Waker{
-		Watcher: w,
-		client: &http.Client{
-			Timeout:   1 * time.Second,
-			Transport: rp.Transport,
-		},
-		rp: rp,
+const (
+	idleWakerCheckInterval = 100 * time.Millisecond
+	idleWakerCheckTimeout  = time.Second
+)
+
+// TODO: support stream
+
+func newWaker(providerSubTask task.Task, entry entry.Entry, rp *gphttp.ReverseProxy, stream net.Stream) (Waker, E.NestedError) {
+	hcCfg := entry.HealthCheckConfig()
+	hcCfg.Timeout = idleWakerCheckTimeout
+
+	waker := &waker{
+		rp:     rp,
+		stream: stream,
 	}
-}
 
-func (w *Waker) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
-	shouldNext := w.wake(rw, r)
-	if !shouldNext {
-		return
+	watcher, err := registerWatcher(providerSubTask, entry, waker)
+	if err != nil {
+		return nil, err
 	}
-	w.rp.ServeHTTP(rw, r)
+
+	if rp != nil {
+		waker.hc = health.NewHTTPHealthChecker(entry.TargetURL(), hcCfg, rp.Transport)
+	} else if stream != nil {
+		waker.hc = health.NewRawHealthChecker(entry.TargetURL(), hcCfg)
+	} else {
+		panic("both nil")
+	}
+	return watcher, nil
 }
 
-/* HealthMonitor interface */
-
-func (w *Waker) Start() {}
-
-func (w *Waker) Stop() {
-	w.Unregister()
+// lifetime should follow route provider
+func NewHTTPWaker(providerSubTask task.Task, entry entry.Entry, rp *gphttp.ReverseProxy) (Waker, E.NestedError) {
+	return newWaker(providerSubTask, entry, rp, nil)
 }
 
-func (w *Waker) UpdateConfig(config health.HealthCheckConfig) {
-	panic("use idlewatcher.Register instead")
+func NewStreamWaker(providerSubTask task.Task, entry entry.Entry, stream net.Stream) (Waker, E.NestedError) {
+	return newWaker(providerSubTask, entry, nil, stream)
 }
 
-func (w *Waker) Name() string {
+// Start implements health.HealthMonitor.
+func (w *Watcher) Start(routeSubTask task.Task) E.NestedError {
+	w.task.OnComplete("stop route", func() {
+		routeSubTask.Parent().Finish("watcher stopped")
+	})
+	return nil
+}
+
+// Finish implements health.HealthMonitor.
+func (w *Watcher) Finish(reason string) {}
+
+// Name implements health.HealthMonitor.
+func (w *Watcher) Name() string {
 	return w.String()
 }
 
-func (w *Waker) String() string {
-	return string(w.Alias)
+// String implements health.HealthMonitor.
+func (w *Watcher) String() string {
+	return w.ContainerName
 }
 
-func (w *Waker) Status() health.Status {
-	if w.ready.Load() {
-		return health.StatusHealthy
-	}
-	if !w.ContainerRunning {
-		return health.StatusNapping
-	}
-	return health.StatusStarting
-}
-
-func (w *Waker) Uptime() time.Duration {
+// Uptime implements health.HealthMonitor.
+func (w *Watcher) Uptime() time.Duration {
 	return 0
 }
 
-func (w *Waker) MarshalJSON() ([]byte, error) {
-	var url types.URL
-	if w.URL.String() != "http://:0" {
-		url = w.URL
+// Status implements health.HealthMonitor.
+func (w *Watcher) Status() health.Status {
+	if !w.ContainerRunning {
+		return health.StatusNapping
+	}
+
+	if w.ready.Load() {
+		return health.StatusHealthy
+	}
+
+	healthy, _, err := w.hc.CheckHealth()
+	switch {
+	case err != nil:
+		return health.StatusError
+	case healthy:
+		w.ready.Store(true)
+		return health.StatusHealthy
+	default:
+		return health.StatusStarting
+	}
+}
+
+// MarshalJSON implements health.HealthMonitor.
+func (w *Watcher) MarshalJSON() ([]byte, error) {
+	var url net.URL
+	if w.hc.URL().Port() != "0" {
+		url = w.hc.URL()
 	}
 	return (&health.JSONRepresentation{
 		Name:   w.Name(),
 		Status: w.Status(),
-		Config: &health.HealthCheckConfig{
-			Interval: w.IdleTimeout,
-			Timeout:  w.WakeTimeout,
-		},
-		URL: url,
+		Config: w.hc.Config(),
+		URL:    url,
 	}).MarshalJSON()
 }
-
-/* End of HealthMonitor interface */
-
-func (w *Waker) wake(rw http.ResponseWriter, r *http.Request) (shouldNext bool) {
-	w.resetIdleTimer()
-
-	if r.Body != nil {
-		defer r.Body.Close()
-	}
-
-	// pass through if container is ready
-	if w.ready.Load() {
-		return true
-	}
-
-	ctx, cancel := context.WithTimeout(r.Context(), w.WakeTimeout)
-	defer cancel()
-
-	accept := gphttp.GetAccept(r.Header)
-	acceptHTML := (r.Method == http.MethodGet && accept.AcceptHTML() || r.RequestURI == "/" && accept.IsEmpty())
-
-	isCheckRedirect := r.Header.Get(headerCheckRedirect) != ""
-	if !isCheckRedirect && acceptHTML {
-		// Send a loading response to the client
-		body := w.makeRespBody("%s waking up...", w.ContainerName)
-		rw.Header().Set("Content-Type", "text/html; charset=utf-8")
-		rw.Header().Set("Content-Length", strconv.Itoa(len(body)))
-		rw.Header().Add("Cache-Control", "no-cache")
-		rw.Header().Add("Cache-Control", "no-store")
-		rw.Header().Add("Cache-Control", "must-revalidate")
-		if _, err := rw.Write(body); err != nil {
-			w.l.Errorf("error writing http response: %s", err)
-		}
-		return
-	}
-
-	select {
-	case <-w.task.Context().Done():
-		http.Error(rw, "Service unavailable", http.StatusServiceUnavailable)
-		return
-	case <-ctx.Done():
-		http.Error(rw, "Waking timed out", http.StatusGatewayTimeout)
-		return
-	default:
-	}
-
-	w.l.Debug("wake signal received")
-	err := w.wakeIfStopped()
-	if err != nil {
-		w.l.Error(E.FailWith("wake", err))
-		http.Error(rw, "Error waking container", http.StatusInternalServerError)
-		return
-	}
-
-	// maybe another request came in while we were waiting for the wake
-	if w.ready.Load() {
-		if isCheckRedirect {
-			rw.WriteHeader(http.StatusOK)
-			return
-		}
-		return true
-	}
-
-	for {
-		select {
-		case <-w.task.Context().Done():
-			http.Error(rw, "Service unavailable", http.StatusServiceUnavailable)
-			return
-		case <-ctx.Done():
-			http.Error(rw, "Waking timed out", http.StatusGatewayTimeout)
-			return
-		default:
-		}
-
-		wakeReq, err := http.NewRequestWithContext(
-			ctx,
-			http.MethodHead,
-			w.URL.String(),
-			nil,
-		)
-		if err != nil {
-			w.l.Errorf("new request err to %s: %s", r.URL, err)
-			http.Error(rw, "Internal server error", http.StatusInternalServerError)
-			return
-		}
-
-		wakeResp, err := w.client.Do(wakeReq)
-		if err == nil && wakeResp.StatusCode != http.StatusServiceUnavailable {
-			w.ready.Store(true)
-			w.l.Debug("awaken")
-			if isCheckRedirect {
-				rw.WriteHeader(http.StatusOK)
-				return
-			}
-			logrus.Infof("container %s is ready, passing through to %s", w.Alias, w.rp.TargetURL)
-			return true
-		}
-
-		// retry until the container is ready or timeout
-		time.Sleep(100 * time.Millisecond)
-	}
-}
-
-// static HealthMonitor interface check
-func (w *Waker) _() health.HealthMonitor {
-	return w
-}

internal/docker/idlewatcher/waker_http.go

@@ -0,0 +1,105 @@
+package idlewatcher
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"strconv"
+	"time"
+
+	"github.com/sirupsen/logrus"
+	E "github.com/yusing/go-proxy/internal/error"
+	gphttp "github.com/yusing/go-proxy/internal/net/http"
+	"github.com/yusing/go-proxy/internal/watcher/health"
+)
+
+// ServeHTTP implements http.Handler
+func (w *Watcher) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
+	shouldNext := w.wakeFromHTTP(rw, r)
+	if !shouldNext {
+		return
+	}
+	w.rp.ServeHTTP(rw, r)
+}
+
+func (w *Watcher) wakeFromHTTP(rw http.ResponseWriter, r *http.Request) (shouldNext bool) {
+	w.resetIdleTimer()
+
+	if r.Body != nil {
+		defer r.Body.Close()
+	}
+
+	// pass through if container is already ready
+	if w.ready.Load() {
+		return true
+	}
+
+	accept := gphttp.GetAccept(r.Header)
+	acceptHTML := (r.Method == http.MethodGet && accept.AcceptHTML() || r.RequestURI == "/" && accept.IsEmpty())
+
+	isCheckRedirect := r.Header.Get(headerCheckRedirect) != ""
+	if !isCheckRedirect && acceptHTML {
+		// Send a loading response to the client
+		body := w.makeLoadingPageBody()
+		rw.Header().Set("Content-Type", "text/html; charset=utf-8")
+		rw.Header().Set("Content-Length", strconv.Itoa(len(body)))
+		rw.Header().Add("Cache-Control", "no-cache")
+		rw.Header().Add("Cache-Control", "no-store")
+		rw.Header().Add("Cache-Control", "must-revalidate")
+		rw.Header().Add("Connection", "close")
+		if _, err := rw.Write(body); err != nil {
+			w.l.Errorf("error writing http response: %s", err)
+		}
+		return
+	}
+
+	ctx, cancel := context.WithTimeoutCause(r.Context(), w.WakeTimeout, errors.New("wake timeout"))
+	defer cancel()
+
+	checkCancelled := func() bool {
+		select {
+		case <-w.task.Context().Done():
+			w.l.Debugf("wake cancelled: %s", context.Cause(w.task.Context()))
+			http.Error(rw, "Service unavailable", http.StatusServiceUnavailable)
+			return true
+		case <-ctx.Done():
+			w.l.Debugf("wake cancelled: %s", context.Cause(ctx))
+			http.Error(rw, "Waking timed out", http.StatusGatewayTimeout)
+			return true
+		default:
+			return false
+		}
+	}
+
+	if checkCancelled() {
+		return false
+	}
+
+	w.l.Debug("wake signal received")
+	err := w.wakeIfStopped()
+	if err != nil {
+		w.l.Error(E.FailWith("wake", err))
+		http.Error(rw, "Error waking container", http.StatusInternalServerError)
+		return
+	}
+
+	for {
+		if checkCancelled() {
+			return false
+		}
+
+		if w.Status() == health.StatusHealthy {
+			w.resetIdleTimer()
+			if isCheckRedirect {
+				logrus.Debugf("container %s is ready, redirecting...", w.String())
+				rw.WriteHeader(http.StatusOK)
+				return
+			}
+			logrus.Infof("container %s is ready, passing through to %s", w.String(), w.hc.URL())
+			return true
+		}
+
+		// retry until the container is ready or timeout
+		time.Sleep(idleWakerCheckInterval)
+	}
+}

internal/docker/idlewatcher/waker_stream.go

@@ -0,0 +1,87 @@
+package idlewatcher
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net"
+	"time"
+
+	"github.com/sirupsen/logrus"
+	"github.com/yusing/go-proxy/internal/net/types"
+	"github.com/yusing/go-proxy/internal/watcher/health"
+)
+
+// Setup implements types.Stream.
+func (w *Watcher) Setup() error {
+	return w.stream.Setup()
+}
+
+// Accept implements types.Stream.
+func (w *Watcher) Accept() (conn types.StreamConn, err error) {
+	conn, err = w.stream.Accept()
+	// timeout means no connection is accepted
+	var nErr *net.OpError
+	ok := errors.As(err, &nErr)
+	if ok && nErr.Timeout() {
+		return
+	}
+	if err := w.wakeFromStream(); err != nil {
+		return nil, err
+	}
+	return w.stream.Accept()
+}
+
+// CloseListeners implements types.Stream.
+func (w *Watcher) CloseListeners() {
+	w.stream.CloseListeners()
+}
+
+// Handle implements types.Stream.
+func (w *Watcher) Handle(conn types.StreamConn) error {
+	if err := w.wakeFromStream(); err != nil {
+		return err
+	}
+	return w.stream.Handle(conn)
+}
+
+func (w *Watcher) wakeFromStream() error {
+	// pass through if container is already ready
+	if w.ready.Load() {
+		return nil
+	}
+
+	w.l.Debug("wake signal received")
+	wakeErr := w.wakeIfStopped()
+	if wakeErr != nil {
+		wakeErr = fmt.Errorf("wake failed with error: %w", wakeErr)
+		w.l.Error(wakeErr)
+		return wakeErr
+	}
+
+	ctx, cancel := context.WithTimeoutCause(w.task.Context(), w.WakeTimeout, errors.New("wake timeout"))
+	defer cancel()
+
+	for {
+		select {
+		case <-w.task.Context().Done():
+			cause := w.task.FinishCause()
+			w.l.Debugf("wake cancelled: %s", cause)
+			return cause
+		case <-ctx.Done():
+			cause := context.Cause(ctx)
+			w.l.Debugf("wake cancelled: %s", cause)
+			return cause
+		default:
+		}
+
+		if w.Status() == health.StatusHealthy {
+			w.resetIdleTimer()
+			logrus.Infof("container %s is ready, passing through to %s", w.String(), w.hc.URL())
+			return nil
+		}
+
+		// retry until the container is ready or timeout
+		time.Sleep(idleWakerCheckInterval)
+	}
+}

internal/docker/idlewatcher/watcher.go

@@ -2,191 +2,193 @@ package idlewatcher
 
 import (
 	"context"
+	"errors"
+	"fmt"
 	"sync"
-	"sync/atomic"
 	"time"
 
 	"github.com/docker/docker/api/types/container"
 	"github.com/sirupsen/logrus"
-	"github.com/yusing/go-proxy/internal/common"
 	D "github.com/yusing/go-proxy/internal/docker"
+	idlewatcher "github.com/yusing/go-proxy/internal/docker/idlewatcher/config"
 	E "github.com/yusing/go-proxy/internal/error"
-	P "github.com/yusing/go-proxy/internal/proxy"
-	PT "github.com/yusing/go-proxy/internal/proxy/fields"
+	"github.com/yusing/go-proxy/internal/proxy/entry"
+	"github.com/yusing/go-proxy/internal/task"
 	U "github.com/yusing/go-proxy/internal/utils"
 	F "github.com/yusing/go-proxy/internal/utils/functional"
+	"github.com/yusing/go-proxy/internal/watcher"
 	W "github.com/yusing/go-proxy/internal/watcher"
+	"github.com/yusing/go-proxy/internal/watcher/events"
 )
 
 type (
 	Watcher struct {
-		*P.ReverseProxyEntry
+		_ U.NoCopy
 
-		client D.Client
+		*idlewatcher.Config
+		*waker
 
-		ready        atomic.Bool  // whether the site is ready to accept connection
+		client       D.Client
 		stopByMethod StopCallback // send a docker command w.r.t. `stop_method`
-
-		ticker *time.Ticker
-
-		task   common.Task
-		cancel context.CancelFunc
-
-		refCount *U.RefCount
-
-		l logrus.FieldLogger
+		ticker       *time.Ticker
+		task         task.Task
+		l            *logrus.Entry
 	}
 
 	WakeDone     <-chan error
 	WakeFunc     func() WakeDone
-	StopCallback func() E.NestedError
+	StopCallback func() error
 )
 
 var (
 	watcherMap   = F.NewMapOf[string, *Watcher]()
 	watcherMapMu sync.Mutex
 
-	portHistoryMap = F.NewMapOf[PT.Alias, string]()
-
 	logger = logrus.WithField("module", "idle_watcher")
 )
 
-func Register(entry *P.ReverseProxyEntry) (*Watcher, E.NestedError) {
-	failure := E.Failure("idle_watcher register")
+const dockerReqTimeout = 3 * time.Second
 
-	if entry.IdleTimeout == 0 {
-		return nil, failure.With(E.Invalid("idle_timeout", 0))
+func registerWatcher(providerSubtask task.Task, entry entry.Entry, waker *waker) (*Watcher, E.NestedError) {
+	failure := E.Failure("idle_watcher register")
+	cfg := entry.IdlewatcherConfig()
+
+	if cfg.IdleTimeout == 0 {
+		panic("should not reach here")
 	}
 
 	watcherMapMu.Lock()
 	defer watcherMapMu.Unlock()
 
-	key := entry.ContainerID
-
-	if entry.URL.Port() != "0" {
-		portHistoryMap.Store(entry.Alias, entry.URL.Port())
-	}
+	key := cfg.ContainerID
 
 	if w, ok := watcherMap.Load(key); ok {
-		w.refCount.Add()
-		w.ReverseProxyEntry = entry
+		w.Config = cfg
+		w.waker = waker
+		w.resetIdleTimer()
 		return w, nil
 	}
 
-	client, err := D.ConnectClient(entry.DockerHost)
+	client, err := D.ConnectClient(cfg.DockerHost)
 	if err.HasError() {
 		return nil, failure.With(err)
 	}
 
 	w := &Watcher{
-		ReverseProxyEntry: entry,
-		client:            client,
-		refCount:          U.NewRefCounter(),
-		ticker:            time.NewTicker(entry.IdleTimeout),
-		l:                 logger.WithField("container", entry.ContainerName),
+		Config: cfg,
+		waker:  waker,
+		client: client,
+		task:   providerSubtask,
+		ticker: time.NewTicker(cfg.IdleTimeout),
+		l:      logger.WithField("container", cfg.ContainerName),
 	}
-	w.task, w.cancel = common.NewTaskWithCancel("Idlewatcher for %s", w.Alias)
 	w.stopByMethod = w.getStopCallback()
-
 	watcherMap.Store(key, w)
 
-	go w.watchUntilCancel()
+	go func() {
+		cause := w.watchUntilDestroy()
+
+		watcherMapMu.Lock()
+		watcherMap.Delete(w.ContainerID)
+		watcherMapMu.Unlock()
+
+		w.ticker.Stop()
+		w.client.Close()
+		w.task.Finish(cause.Error())
+	}()
 
 	return w, nil
 }
 
-func (w *Watcher) Unregister() {
-	w.refCount.Sub()
-}
-
-func (w *Watcher) containerStop() error {
-	return w.client.ContainerStop(w.task.Context(), w.ContainerID, container.StopOptions{
+func (w *Watcher) containerStop(ctx context.Context) error {
+	return w.client.ContainerStop(ctx, w.ContainerID, container.StopOptions{
 		Signal:  string(w.StopSignal),
 		Timeout: &w.StopTimeout,
 	})
 }
 
-func (w *Watcher) containerPause() error {
-	return w.client.ContainerPause(w.task.Context(), w.ContainerID)
+func (w *Watcher) containerPause(ctx context.Context) error {
+	return w.client.ContainerPause(ctx, w.ContainerID)
 }
 
-func (w *Watcher) containerKill() error {
-	return w.client.ContainerKill(w.task.Context(), w.ContainerID, string(w.StopSignal))
+func (w *Watcher) containerKill(ctx context.Context) error {
+	return w.client.ContainerKill(ctx, w.ContainerID, string(w.StopSignal))
 }
 
-func (w *Watcher) containerUnpause() error {
-	return w.client.ContainerUnpause(w.task.Context(), w.ContainerID)
+func (w *Watcher) containerUnpause(ctx context.Context) error {
+	return w.client.ContainerUnpause(ctx, w.ContainerID)
 }
 
-func (w *Watcher) containerStart() error {
-	return w.client.ContainerStart(w.task.Context(), w.ContainerID, container.StartOptions{})
+func (w *Watcher) containerStart(ctx context.Context) error {
+	return w.client.ContainerStart(ctx, w.ContainerID, container.StartOptions{})
 }
 
-func (w *Watcher) containerStatus() (string, E.NestedError) {
+func (w *Watcher) containerStatus() (string, error) {
 	if !w.client.Connected() {
-		return "", E.Failure("docker client closed")
+		return "", errors.New("docker client not connected")
 	}
-	json, err := w.client.ContainerInspect(w.task.Context(), w.ContainerID)
+	ctx, cancel := context.WithTimeoutCause(w.task.Context(), dockerReqTimeout, errors.New("docker request timeout"))
+	defer cancel()
+	json, err := w.client.ContainerInspect(ctx, w.ContainerID)
 	if err != nil {
-		return "", E.FailWith("inspect container", err)
+		return "", fmt.Errorf("failed to inspect container: %w", err)
 	}
 	return json.State.Status, nil
 }
 
-func (w *Watcher) wakeIfStopped() E.NestedError {
-	if w.ready.Load() || w.ContainerRunning {
+func (w *Watcher) wakeIfStopped() error {
+	if w.ContainerRunning {
 		return nil
 	}
 
 	status, err := w.containerStatus()
-
-	if err.HasError() {
+	if err != nil {
 		return err
 	}
-	// "created", "running", "paused", "restarting", "removing", "exited", or "dead"
+
+	ctx, cancel := context.WithTimeout(w.task.Context(), dockerReqTimeout)
+	defer cancel()
+
+	// !Hard coded here since theres no constants from Docker API
 	switch status {
 	case "exited", "dead":
-		return E.From(w.containerStart())
+		return w.containerStart(ctx)
 	case "paused":
-		return E.From(w.containerUnpause())
+		return w.containerUnpause(ctx)
 	case "running":
 		return nil
 	default:
-		return E.Unexpected("container state", status)
+		panic("should not reach here")
 	}
 }
 
 func (w *Watcher) getStopCallback() StopCallback {
-	var cb func() error
+	var cb func(context.Context) error
 	switch w.StopMethod {
-	case PT.StopMethodPause:
+	case idlewatcher.StopMethodPause:
 		cb = w.containerPause
-	case PT.StopMethodStop:
+	case idlewatcher.StopMethodStop:
 		cb = w.containerStop
-	case PT.StopMethodKill:
+	case idlewatcher.StopMethodKill:
 		cb = w.containerKill
 	default:
 		panic("should not reach here")
 	}
-	return func() E.NestedError {
-		status, err := w.containerStatus()
-		if err.HasError() {
-			return err
-		}
-		if status != "running" {
-			return nil
-		}
-		return E.From(cb())
+	return func() error {
+		ctx, cancel := context.WithTimeout(w.task.Context(), dockerReqTimeout)
+		defer cancel()
+		return cb(ctx)
 	}
 }
 
 func (w *Watcher) resetIdleTimer() {
+	w.l.Trace("reset idle timer")
 	w.ticker.Reset(w.IdleTimeout)
 }
 
-func (w *Watcher) watchUntilCancel() {
-	dockerWatcher := W.NewDockerWatcherWithClient(w.client)
-	dockerEventCh, dockerEventErrCh := dockerWatcher.EventsWithOptions(w.task.Context(), W.DockerListOptions{
+func (w *Watcher) getEventCh(dockerWatcher watcher.DockerWatcher) (eventTask task.Task, eventCh <-chan events.Event, errCh <-chan E.NestedError) {
+	eventTask = w.task.Subtask("watcher for %s", w.ContainerID)
+	eventCh, errCh = dockerWatcher.EventsWithOptions(eventTask.Context(), W.DockerListOptions{
 		Filters: W.NewDockerFilter(
 			W.DockerFilterContainer,
 			W.DockerrFilterContainer(w.ContainerID),
@@ -194,34 +196,47 @@ func (w *Watcher) watchUntilCancel() {
 			W.DockerFilterStop,
 			W.DockerFilterDie,
 			W.DockerFilterKill,
+			W.DockerFilterDestroy,
 			W.DockerFilterPause,
 			W.DockerFilterUnpause,
 		),
 	})
+	return
+}
 
-	defer func() {
-		w.cancel()
-		w.ticker.Stop()
-		w.client.Close()
-		watcherMap.Delete(w.ContainerID)
-		w.task.Finished()
-	}()
+// watchUntilDestroy waits for the container to be created, started, or unpaused,
+// and then reset the idle timer.
+//
+// When the container is stopped, paused,
+// or killed, the idle timer is stopped and the ContainerRunning flag is set to false.
+//
+// When the idle timer fires, the container is stopped according to the
+// stop method.
+//
+// it exits only if the context is canceled, the container is destroyed,
+// errors occured on docker client, or route provider died (mainly caused by config reload).
+func (w *Watcher) watchUntilDestroy() error {
+	dockerWatcher := W.NewDockerWatcherWithClient(w.client)
+	eventTask, dockerEventCh, dockerEventErrCh := w.getEventCh(dockerWatcher)
 
 	for {
 		select {
 		case <-w.task.Context().Done():
-			w.l.Debug("stopped by context done")
-			return
-		case <-w.refCount.Zero():
-			w.l.Debug("stopped by zero ref count")
-			return
+			cause := context.Cause(w.task.Context())
+			w.l.Debugf("watcher stopped by context done: %s", cause)
+			return cause
 		case err := <-dockerEventErrCh:
 			if err != nil && err.IsNot(context.Canceled) {
 				w.l.Error(E.FailWith("docker watcher", err))
-				return
+				return err.Error()
 			}
 		case e := <-dockerEventCh:
 			switch {
+			case e.Action == events.ActionContainerDestroy:
+				w.ContainerRunning = false
+				w.ready.Store(false)
+				w.l.Info("watcher stopped by container destruction")
+				return errors.New("container destroyed")
 			// create / start / unpause
 			case e.Action.IsContainerWake():
 				w.ContainerRunning = true
@@ -229,18 +244,31 @@ func (w *Watcher) watchUntilCancel() {
 				w.l.Info("container awaken")
 			case e.Action.IsContainerSleep(): // stop / pause / kil
 				w.ContainerRunning = false
-				w.ticker.Stop()
 				w.ready.Store(false)
+				w.ticker.Stop()
 			default:
 				w.l.Errorf("unexpected docker event: %s", e)
 			}
+			// container name changed should also change the container id
+			if w.ContainerName != e.ActorName {
+				w.l.Debugf("container renamed %s -> %s", w.ContainerName, e.ActorName)
+				w.ContainerName = e.ActorName
+			}
+			if w.ContainerID != e.ActorID {
+				w.l.Debugf("container id changed %s -> %s", w.ContainerID, e.ActorID)
+				w.ContainerID = e.ActorID
+				// recreate event stream
+				eventTask.Finish("recreate event stream")
+				eventTask, dockerEventCh, dockerEventErrCh = w.getEventCh(dockerWatcher)
+			}
 		case <-w.ticker.C:
-			w.l.Debug("idle timeout")
 			w.ticker.Stop()
-			if err := w.stopByMethod(); err != nil && err.IsNot(context.Canceled) {
-				w.l.Error(E.FailWith("stop", err).Extraf("stop method: %s", w.StopMethod))
-			} else {
-				w.l.Info("stopped by idle timeout")
+			if w.ContainerRunning {
+				if err := w.stopByMethod(); err != nil && !errors.Is(err, context.Canceled) {
+					w.l.Errorf("container stop with method %q failed with error: %v", w.StopMethod, err)
+				} else {
+					w.l.Info("container stopped by idle timeout")
+				}
 			}
 		}
 	}

internal/docker/inspect.go

@@ -2,6 +2,7 @@ package docker
 
 import (
 	"context"
+	"errors"
 	"time"
 
 	E "github.com/yusing/go-proxy/internal/error"
@@ -19,7 +20,7 @@ func Inspect(dockerHost string, containerID string) (*Container, E.NestedError)
 }
 
 func (c Client) Inspect(containerID string) (*Container, E.NestedError) {
-	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	ctx, cancel := context.WithTimeoutCause(context.Background(), 3*time.Second, errors.New("docker container inspect timeout"))
 	defer cancel()
 
 	json, err := c.ContainerInspect(ctx, containerID)

internal/error/builder.go

@@ -17,35 +17,36 @@ type builder struct {
 }
 
 func NewBuilder(format string, args ...any) Builder {
-	return Builder{&builder{message: fmt.Sprintf(format, args...)}}
+	if len(args) > 0 {
+		return Builder{&builder{message: fmt.Sprintf(format, args...)}}
+	}
+	return Builder{&builder{message: format}}
 }
 
 // adding nil / nil is no-op,
 // you may safely pass expressions returning error to it.
-func (b Builder) Add(err NestedError) Builder {
+func (b Builder) Add(err NestedError) {
 	if err != nil {
 		b.Lock()
 		b.errors = append(b.errors, err)
 		b.Unlock()
 	}
-	return b
 }
 
-func (b Builder) AddE(err error) Builder {
-	return b.Add(From(err))
+func (b Builder) AddE(err error) {
+	b.Add(From(err))
 }
 
-func (b Builder) Addf(format string, args ...any) Builder {
-	return b.Add(errorf(format, args...))
+func (b Builder) Addf(format string, args ...any) {
+	b.Add(errorf(format, args...))
 }
 
-func (b Builder) AddRangeE(errs ...error) Builder {
+func (b Builder) AddRangeE(errs ...error) {
 	b.Lock()
 	defer b.Unlock()
 	for _, err := range errs {
 		b.AddE(err)
 	}
-	return b
 }
 
 // Build builds a NestedError based on the errors collected in the Builder.

internal/error/errors.go

@@ -2,6 +2,7 @@ package error
 
 import (
 	stderrors "errors"
+	"fmt"
 	"reflect"
 )
 
@@ -16,6 +17,7 @@ var (
 	ErrOutOfRange   = stderrors.New("out of range")
 	ErrTypeError    = stderrors.New("type error")
 	ErrTypeMismatch = stderrors.New("type mismatch")
+	ErrPanicRecv    = stderrors.New("panic")
 )
 
 const fmtSubjectWhat = "%w %v: %q"
@@ -75,3 +77,7 @@ func TypeError2(subject any, from, to reflect.Value) NestedError {
 func TypeMismatch[Expect any](value any) NestedError {
 	return errorf("%w: expect %s got %T", ErrTypeMismatch, reflect.TypeFor[Expect](), value)
 }
+
+func PanicRecv(format string, args ...any) NestedError {
+	return errorf("%w%s", ErrPanicRecv, fmt.Sprintf(format, args...))
+}

internal/net/http/loadbalancer/ip_hash.go

@@ -4,18 +4,20 @@ import (
 	"hash/fnv"
 	"net"
 	"net/http"
+	"sync"
 
 	E "github.com/yusing/go-proxy/internal/error"
 	"github.com/yusing/go-proxy/internal/net/http/middleware"
 )
 
 type ipHash struct {
-	*LoadBalancer
 	realIP *middleware.Middleware
+	pool   servers
+	mu     sync.Mutex
 }
 
 func (lb *LoadBalancer) newIPHash() impl {
-	impl := &ipHash{LoadBalancer: lb}
+	impl := new(ipHash)
 	if len(lb.Options) == 0 {
 		return impl
 	}
@@ -26,10 +28,37 @@ func (lb *LoadBalancer) newIPHash() impl {
 	}
 	return impl
 }
-func (ipHash) OnAddServer(srv *Server)    {}
-func (ipHash) OnRemoveServer(srv *Server) {}
 
-func (impl ipHash) ServeHTTP(_ servers, rw http.ResponseWriter, r *http.Request) {
+func (impl *ipHash) OnAddServer(srv *Server) {
+	impl.mu.Lock()
+	defer impl.mu.Unlock()
+
+	for i, s := range impl.pool {
+		if s == srv {
+			return
+		}
+		if s == nil {
+			impl.pool[i] = srv
+			return
+		}
+	}
+
+	impl.pool = append(impl.pool, srv)
+}
+
+func (impl *ipHash) OnRemoveServer(srv *Server) {
+	impl.mu.Lock()
+	defer impl.mu.Unlock()
+
+	for i, s := range impl.pool {
+		if s == srv {
+			impl.pool[i] = nil
+			return
+		}
+	}
+}
+
+func (impl *ipHash) ServeHTTP(_ servers, rw http.ResponseWriter, r *http.Request) {
 	if impl.realIP != nil {
 		impl.realIP.ModifyRequest(impl.serveHTTP, rw, r)
 	} else {
@@ -37,7 +66,7 @@ func (impl ipHash) ServeHTTP(_ servers, rw http.ResponseWriter, r *http.Request)
 	}
 }
 
-func (impl ipHash) serveHTTP(rw http.ResponseWriter, r *http.Request) {
+func (impl *ipHash) serveHTTP(rw http.ResponseWriter, r *http.Request) {
 	ip, _, err := net.SplitHostPort(r.RemoteAddr)
 	if err != nil {
 		http.Error(rw, "Internal error", http.StatusInternalServerError)
@@ -45,10 +74,12 @@ func (impl ipHash) serveHTTP(rw http.ResponseWriter, r *http.Request) {
 		return
 	}
 	idx := hashIP(ip) % uint32(len(impl.pool))
-	if impl.pool[idx].Status().Bad() {
+
+	srv := impl.pool[idx]
+	if srv == nil || srv.Status().Bad() {
 		http.Error(rw, "Service unavailable", http.StatusServiceUnavailable)
 	}
-	impl.pool[idx].ServeHTTP(rw, r)
+	srv.ServeHTTP(rw, r)
 }
 
 func hashIP(ip string) uint32 {

internal/net/http/loadbalancer/loadbalancer.go

@@ -5,8 +5,9 @@ import (
 	"sync"
 	"time"
 
-	"github.com/go-acme/lego/v4/log"
+	E "github.com/yusing/go-proxy/internal/error"
 	"github.com/yusing/go-proxy/internal/net/http/middleware"
+	"github.com/yusing/go-proxy/internal/task"
 	"github.com/yusing/go-proxy/internal/watcher/health"
 )
 
@@ -28,7 +29,9 @@ type (
 		impl
 		*Config
 
-		pool   servers
+		task task.Task
+
+		pool   Pool
 		poolMu sync.Mutex
 
 		sumWeight weightType
@@ -41,11 +44,35 @@ type (
 const maxWeight weightType = 100
 
 func New(cfg *Config) *LoadBalancer {
-	lb := &LoadBalancer{Config: new(Config), pool: make(servers, 0)}
+	lb := &LoadBalancer{
+		Config: new(Config),
+		pool:   newPool(),
+		task:   task.DummyTask(),
+	}
 	lb.UpdateConfigIfNeeded(cfg)
 	return lb
 }
 
+// Start implements task.TaskStarter.
+func (lb *LoadBalancer) Start(routeSubtask task.Task) E.NestedError {
+	lb.startTime = time.Now()
+	lb.task = routeSubtask
+	lb.task.OnComplete("loadbalancer cleanup", func() {
+		if lb.impl != nil {
+			lb.pool.RangeAll(func(k string, v *Server) {
+				lb.impl.OnRemoveServer(v)
+			})
+		}
+		lb.pool.Clear()
+	})
+	return nil
+}
+
+// Finish implements task.TaskFinisher.
+func (lb *LoadBalancer) Finish(reason string) {
+	lb.task.Finish(reason)
+}
+
 func (lb *LoadBalancer) updateImpl() {
 	switch lb.Mode {
 	case Unset, RoundRobin:
@@ -57,9 +84,9 @@ func (lb *LoadBalancer) updateImpl() {
 	default: // should happen in test only
 		lb.impl = lb.newRoundRobin()
 	}
-	for _, srv := range lb.pool {
+	lb.pool.RangeAll(func(_ string, srv *Server) {
 		lb.impl.OnAddServer(srv)
-	}
+	})
 }
 
 func (lb *LoadBalancer) UpdateConfigIfNeeded(cfg *Config) {
@@ -91,55 +118,60 @@ func (lb *LoadBalancer) AddServer(srv *Server) {
 	lb.poolMu.Lock()
 	defer lb.poolMu.Unlock()
 
-	lb.pool = append(lb.pool, srv)
+	if lb.pool.Has(srv.Name) {
+		old, _ := lb.pool.Load(srv.Name)
+		lb.sumWeight -= old.Weight
+		lb.impl.OnRemoveServer(old)
+	}
+	lb.pool.Store(srv.Name, srv)
 	lb.sumWeight += srv.Weight
 
-	lb.Rebalance()
+	lb.rebalance()
 	lb.impl.OnAddServer(srv)
-	logger.Debugf("[add] loadbalancer %s: %d servers available", lb.Link, len(lb.pool))
+	logger.Infof("[add] %s to loadbalancer %s: %d servers available", srv.Name, lb.Link, lb.pool.Size())
 }
 
 func (lb *LoadBalancer) RemoveServer(srv *Server) {
 	lb.poolMu.Lock()
 	defer lb.poolMu.Unlock()
 
-	lb.sumWeight -= srv.Weight
-	lb.Rebalance()
-	lb.impl.OnRemoveServer(srv)
-
-	for i, s := range lb.pool {
-		if s == srv {
-			lb.pool = append(lb.pool[:i], lb.pool[i+1:]...)
-			break
-		}
-	}
-	if lb.IsEmpty() {
-		lb.pool = nil
+	if !lb.pool.Has(srv.Name) {
 		return
 	}
 
-	logger.Debugf("[remove] loadbalancer %s: %d servers left", lb.Link, len(lb.pool))
+	lb.pool.Delete(srv.Name)
+
+	lb.sumWeight -= srv.Weight
+	lb.rebalance()
+	lb.impl.OnRemoveServer(srv)
+
+	if lb.pool.Size() == 0 {
+		lb.task.Finish("no server left")
+		logger.Infof("[remove] loadbalancer %s stopped", lb.Link)
+		return
+	}
+
+	logger.Infof("[remove] %s from loadbalancer %s: %d servers left", srv.Name, lb.Link, lb.pool.Size())
 }
 
-func (lb *LoadBalancer) IsEmpty() bool {
-	return len(lb.pool) == 0
-}
-
-func (lb *LoadBalancer) Rebalance() {
+func (lb *LoadBalancer) rebalance() {
 	if lb.sumWeight == maxWeight {
 		return
 	}
+	if lb.pool.Size() == 0 {
+		return
+	}
 	if lb.sumWeight == 0 { // distribute evenly
-		weightEach := maxWeight / weightType(len(lb.pool))
-		remainder := maxWeight % weightType(len(lb.pool))
-		for _, s := range lb.pool {
+		weightEach := maxWeight / weightType(lb.pool.Size())
+		remainder := maxWeight % weightType(lb.pool.Size())
+		lb.pool.RangeAll(func(_ string, s *Server) {
 			s.Weight = weightEach
 			lb.sumWeight += weightEach
 			if remainder > 0 {
 				s.Weight++
 				remainder--
 			}
-		}
+		})
 		return
 	}
 
@@ -147,18 +179,18 @@ func (lb *LoadBalancer) Rebalance() {
 	scaleFactor := float64(maxWeight) / float64(lb.sumWeight)
 	lb.sumWeight = 0
 
-	for _, s := range lb.pool {
+	lb.pool.RangeAll(func(_ string, s *Server) {
 		s.Weight = weightType(float64(s.Weight) * scaleFactor)
 		lb.sumWeight += s.Weight
-	}
+	})
 
 	delta := maxWeight - lb.sumWeight
 	if delta == 0 {
 		return
 	}
-	for _, s := range lb.pool {
+	lb.pool.Range(func(_ string, s *Server) bool {
 		if delta == 0 {
-			break
+			return false
 		}
 		if delta > 0 {
 			s.Weight++
@@ -169,7 +201,8 @@ func (lb *LoadBalancer) Rebalance() {
 			lb.sumWeight--
 			delta++
 		}
-	}
+		return true
+	})
 }
 
 func (lb *LoadBalancer) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
@@ -181,23 +214,6 @@ func (lb *LoadBalancer) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
 	lb.impl.ServeHTTP(srvs, rw, r)
 }
 
-func (lb *LoadBalancer) Start() {
-	if lb.sumWeight != 0 {
-		log.Warnf("weighted mode not supported yet")
-	}
-
-	lb.startTime = time.Now()
-	logger.Debugf("loadbalancer %s started", lb.Link)
-}
-
-func (lb *LoadBalancer) Stop() {
-	lb.poolMu.Lock()
-	defer lb.poolMu.Unlock()
-	lb.pool = nil
-
-	logger.Debugf("loadbalancer %s stopped", lb.Link)
-}
-
 func (lb *LoadBalancer) Uptime() time.Duration {
 	return time.Since(lb.startTime)
 }
@@ -205,9 +221,10 @@ func (lb *LoadBalancer) Uptime() time.Duration {
 // MarshalJSON implements health.HealthMonitor.
 func (lb *LoadBalancer) MarshalJSON() ([]byte, error) {
 	extra := make(map[string]any)
-	for _, v := range lb.pool {
+	lb.pool.RangeAll(func(k string, v *Server) {
 		extra[v.Name] = v.healthMon
-	}
+	})
+
 	return (&health.JSONRepresentation{
 		Name:    lb.Name(),
 		Status:  lb.Status(),
@@ -227,7 +244,7 @@ func (lb *LoadBalancer) Name() string {
 
 // Status implements health.HealthMonitor.
 func (lb *LoadBalancer) Status() health.Status {
-	if len(lb.pool) == 0 {
+	if lb.pool.Size() == 0 {
 		return health.StatusUnknown
 	}
 	if len(lb.availServers()) == 0 {
@@ -241,21 +258,13 @@ func (lb *LoadBalancer) String() string {
 	return lb.Name()
 }
 
-func (lb *LoadBalancer) availServers() servers {
-	lb.poolMu.Lock()
-	defer lb.poolMu.Unlock()
-
-	avail := make(servers, 0, len(lb.pool))
-	for _, s := range lb.pool {
-		if s.Status().Bad() {
-			continue
+func (lb *LoadBalancer) availServers() []*Server {
+	avail := make([]*Server, 0, lb.pool.Size())
+	lb.pool.RangeAll(func(_ string, srv *Server) {
+		if srv.Status().Bad() {
+			return
 		}
-		avail = append(avail, s)
-	}
+		avail = append(avail, srv)
+	})
 	return avail
 }
-
-// static HealthMonitor interface check
-func (lb *LoadBalancer) _() health.HealthMonitor {
-	return lb
-}

internal/net/http/loadbalancer/loadbalancer_test.go

@@ -13,7 +13,7 @@ func TestRebalance(t *testing.T) {
 		for range 10 {
 			lb.AddServer(&Server{})
 		}
-		lb.Rebalance()
+		lb.rebalance()
 		ExpectEqual(t, lb.sumWeight, maxWeight)
 	})
 	t.Run("less", func(t *testing.T) {
@@ -23,7 +23,7 @@ func TestRebalance(t *testing.T) {
 		lb.AddServer(&Server{Weight: weightType(float64(maxWeight) * .3)})
 		lb.AddServer(&Server{Weight: weightType(float64(maxWeight) * .2)})
 		lb.AddServer(&Server{Weight: weightType(float64(maxWeight) * .1)})
-		lb.Rebalance()
+		lb.rebalance()
 		// t.Logf("%s", U.Must(json.MarshalIndent(lb.pool, "", "  ")))
 		ExpectEqual(t, lb.sumWeight, maxWeight)
 	})
@@ -36,7 +36,7 @@ func TestRebalance(t *testing.T) {
 		lb.AddServer(&Server{Weight: weightType(float64(maxWeight) * .3)})
 		lb.AddServer(&Server{Weight: weightType(float64(maxWeight) * .2)})
 		lb.AddServer(&Server{Weight: weightType(float64(maxWeight) * .1)})
-		lb.Rebalance()
+		lb.rebalance()
 		// t.Logf("%s", U.Must(json.MarshalIndent(lb.pool, "", "  ")))
 		ExpectEqual(t, lb.sumWeight, maxWeight)
 	})

internal/net/http/loadbalancer/server.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/yusing/go-proxy/internal/net/types"
 	U "github.com/yusing/go-proxy/internal/utils"
+	F "github.com/yusing/go-proxy/internal/utils/functional"
 	"github.com/yusing/go-proxy/internal/watcher/health"
 )
 
@@ -20,9 +21,12 @@ type (
 		handler   http.Handler
 		healthMon health.HealthMonitor
 	}
-	servers []*Server
+	servers = []*Server
+	Pool    = F.Map[string, *Server]
 )
 
+var newPool = F.NewMap[Pool]
+
 func NewServer(name string, url types.URL, weight weightType, handler http.Handler, healthMon health.HealthMonitor) *Server {
 	srv := &Server{
 		Name:      name,

internal/net/http/middleware/middleware_builder.go

@@ -48,11 +48,11 @@ func BuildMiddlewaresFromYAML(data []byte) (middlewares map[string]*Middleware,
 			}
 			delete(def, "use")
 			m, err := base.WithOptionsClone(def)
-			m.name = fmt.Sprintf("%s[%d]", name, i)
 			if err != nil {
 				chainErr.Add(err.Subjectf("item%d", i))
 				continue
 			}
+			m.name = fmt.Sprintf("%s[%d]", name, i)
 			chain = append(chain, m)
 		}
 		if chainErr.HasError() {

internal/net/types/stream.go

@@ -0,0 +1,19 @@
+package types
+
+import (
+	"fmt"
+	"net"
+)
+
+type Stream interface {
+	fmt.Stringer
+	Setup() error
+	Accept() (conn StreamConn, err error)
+	Handle(conn StreamConn) error
+	CloseListeners()
+}
+
+type StreamConn interface {
+	RemoteAddr() net.Addr
+	Close() error
+}

internal/proxy/entry.go

@@ -1,177 +0,0 @@
-package proxy
-
-import (
-	"fmt"
-	"net/url"
-	"time"
-
-	D "github.com/yusing/go-proxy/internal/docker"
-	E "github.com/yusing/go-proxy/internal/error"
-	"github.com/yusing/go-proxy/internal/net/http/loadbalancer"
-	net "github.com/yusing/go-proxy/internal/net/types"
-	T "github.com/yusing/go-proxy/internal/proxy/fields"
-	"github.com/yusing/go-proxy/internal/types"
-	"github.com/yusing/go-proxy/internal/watcher/health"
-)
-
-type (
-	ReverseProxyEntry struct { // real model after validation
-		Raw *types.RawEntry `json:"raw"`
-
-		Alias        T.Alias                   `json:"alias,omitempty"`
-		Scheme       T.Scheme                  `json:"scheme,omitempty"`
-		URL          net.URL                   `json:"url,omitempty"`
-		NoTLSVerify  bool                      `json:"no_tls_verify,omitempty"`
-		PathPatterns T.PathPatterns            `json:"path_patterns,omitempty"`
-		HealthCheck  *health.HealthCheckConfig `json:"healthcheck,omitempty"`
-		LoadBalance  *loadbalancer.Config      `json:"load_balance,omitempty"`
-		Middlewares  D.NestedLabelMap          `json:"middlewares,omitempty"`
-
-		/* Docker only */
-		IdleTimeout      time.Duration `json:"idle_timeout,omitempty"`
-		WakeTimeout      time.Duration `json:"wake_timeout,omitempty"`
-		StopMethod       T.StopMethod  `json:"stop_method,omitempty"`
-		StopTimeout      int           `json:"stop_timeout,omitempty"`
-		StopSignal       T.Signal      `json:"stop_signal,omitempty"`
-		DockerHost       string        `json:"docker_host,omitempty"`
-		ContainerName    string        `json:"container_name,omitempty"`
-		ContainerID      string        `json:"container_id,omitempty"`
-		ContainerRunning bool          `json:"container_running,omitempty"`
-	}
-	StreamEntry struct {
-		Raw *types.RawEntry `json:"raw"`
-
-		Alias       T.Alias                   `json:"alias,omitempty"`
-		Scheme      T.StreamScheme            `json:"scheme,omitempty"`
-		Host        T.Host                    `json:"host,omitempty"`
-		Port        T.StreamPort              `json:"port,omitempty"`
-		Healthcheck *health.HealthCheckConfig `json:"healthcheck,omitempty"`
-	}
-)
-
-func (rp *ReverseProxyEntry) UseIdleWatcher() bool {
-	return rp.IdleTimeout > 0 && rp.IsDocker()
-}
-
-func (rp *ReverseProxyEntry) UseLoadBalance() bool {
-	return rp.LoadBalance != nil && rp.LoadBalance.Link != ""
-}
-
-func (rp *ReverseProxyEntry) IsDocker() bool {
-	return rp.DockerHost != ""
-}
-
-func (rp *ReverseProxyEntry) IsZeroPort() bool {
-	return rp.URL.Port() == "0"
-}
-
-func (rp *ReverseProxyEntry) ShouldNotServe() bool {
-	return rp.IsZeroPort() && !rp.UseIdleWatcher()
-}
-
-func ValidateEntry(m *types.RawEntry) (any, E.NestedError) {
-	m.FillMissingFields()
-
-	scheme, err := T.NewScheme(m.Scheme)
-	if err != nil {
-		return nil, err
-	}
-
-	var entry any
-	e := E.NewBuilder("error validating entry")
-	if scheme.IsStream() {
-		entry = validateStreamEntry(m, e)
-	} else {
-		entry = validateRPEntry(m, scheme, e)
-	}
-	if err := e.Build(); err != nil {
-		return nil, err
-	}
-	return entry, nil
-}
-
-func validateRPEntry(m *types.RawEntry, s T.Scheme, b E.Builder) *ReverseProxyEntry {
-	var stopTimeOut time.Duration
-	cont := m.Container
-	if cont == nil {
-		cont = D.DummyContainer
-	}
-
-	host, err := T.ValidateHost(m.Host)
-	b.Add(err)
-
-	port, err := T.ValidatePort(m.Port)
-	b.Add(err)
-
-	pathPatterns, err := T.ValidatePathPatterns(m.PathPatterns)
-	b.Add(err)
-
-	url, err := E.Check(url.Parse(fmt.Sprintf("%s://%s:%d", s, host, port)))
-	b.Add(err)
-
-	idleTimeout, err := T.ValidateDurationPostitive(cont.IdleTimeout)
-	b.Add(err)
-
-	wakeTimeout, err := T.ValidateDurationPostitive(cont.WakeTimeout)
-	b.Add(err)
-
-	stopMethod, err := T.ValidateStopMethod(cont.StopMethod)
-	b.Add(err)
-
-	if stopMethod == T.StopMethodStop {
-		stopTimeOut, err = T.ValidateDurationPostitive(cont.StopTimeout)
-		b.Add(err)
-	}
-
-	stopSignal, err := T.ValidateSignal(cont.StopSignal)
-	b.Add(err)
-
-	if err != nil {
-		return nil
-	}
-
-	return &ReverseProxyEntry{
-		Raw:              m,
-		Alias:            T.NewAlias(m.Alias),
-		Scheme:           s,
-		URL:              net.NewURL(url),
-		NoTLSVerify:      m.NoTLSVerify,
-		PathPatterns:     pathPatterns,
-		HealthCheck:      &m.HealthCheck,
-		LoadBalance:      &m.LoadBalance,
-		Middlewares:      m.Middlewares,
-		IdleTimeout:      idleTimeout,
-		WakeTimeout:      wakeTimeout,
-		StopMethod:       stopMethod,
-		StopTimeout:      int(stopTimeOut.Seconds()), // docker api takes integer seconds for timeout argument
-		StopSignal:       stopSignal,
-		DockerHost:       cont.DockerHost,
-		ContainerName:    cont.ContainerName,
-		ContainerID:      cont.ContainerID,
-		ContainerRunning: cont.Running,
-	}
-}
-
-func validateStreamEntry(m *types.RawEntry, b E.Builder) *StreamEntry {
-	host, err := T.ValidateHost(m.Host)
-	b.Add(err)
-
-	port, err := T.ValidateStreamPort(m.Port)
-	b.Add(err)
-
-	scheme, err := T.ValidateStreamScheme(m.Scheme)
-	b.Add(err)
-
-	if b.HasError() {
-		return nil
-	}
-
-	return &StreamEntry{
-		Raw:         m,
-		Alias:       T.NewAlias(m.Alias),
-		Scheme:      *scheme,
-		Host:        host,
-		Port:        port,
-		Healthcheck: &m.HealthCheck,
-	}
-}

internal/proxy/entry/entry.go

@@ -0,0 +1,68 @@
+package entry
+
+import (
+	idlewatcher "github.com/yusing/go-proxy/internal/docker/idlewatcher/config"
+	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/net/http/loadbalancer"
+	net "github.com/yusing/go-proxy/internal/net/types"
+	T "github.com/yusing/go-proxy/internal/proxy/fields"
+	"github.com/yusing/go-proxy/internal/watcher/health"
+)
+
+type Entry interface {
+	TargetName() string
+	TargetURL() net.URL
+	RawEntry() *RawEntry
+	LoadBalanceConfig() *loadbalancer.Config
+	HealthCheckConfig() *health.HealthCheckConfig
+	IdlewatcherConfig() *idlewatcher.Config
+}
+
+func ValidateEntry(m *RawEntry) (Entry, E.NestedError) {
+	m.FillMissingFields()
+
+	scheme, err := T.NewScheme(m.Scheme)
+	if err != nil {
+		return nil, err
+	}
+
+	var entry Entry
+	e := E.NewBuilder("error validating entry")
+	if scheme.IsStream() {
+		entry = validateStreamEntry(m, e)
+	} else {
+		entry = validateRPEntry(m, scheme, e)
+	}
+	if err := e.Build(); err != nil {
+		return nil, err
+	}
+	return entry, nil
+}
+
+func IsDocker(entry Entry) bool {
+	iw := entry.IdlewatcherConfig()
+	return iw != nil && iw.ContainerID != ""
+}
+
+func IsZeroPort(entry Entry) bool {
+	return entry.TargetURL().Port() == "0"
+}
+
+func ShouldNotServe(entry Entry) bool {
+	return IsZeroPort(entry) && !UseIdleWatcher(entry)
+}
+
+func UseLoadBalance(entry Entry) bool {
+	lb := entry.LoadBalanceConfig()
+	return lb != nil && lb.Link != ""
+}
+
+func UseIdleWatcher(entry Entry) bool {
+	iw := entry.IdlewatcherConfig()
+	return iw != nil && iw.IdleTimeout > 0
+}
+
+func UseHealthCheck(entry Entry) bool {
+	hc := entry.HealthCheckConfig()
+	return hc != nil && !hc.Disabled
+}

internal/proxy/entry/raw.go

@@ -1,4 +1,4 @@
-package types
+package entry
 
 import (
 	"strconv"
@@ -21,16 +21,16 @@ type (
 
 		// raw entry object before validation
 		// loaded from docker labels or yaml file
-		Alias        string                   `json:"-" yaml:"-"`
-		Scheme       string                   `json:"scheme,omitempty" yaml:"scheme"`
-		Host         string                   `json:"host,omitempty" yaml:"host"`
-		Port         string                   `json:"port,omitempty" yaml:"port"`
-		NoTLSVerify  bool                     `json:"no_tls_verify,omitempty" yaml:"no_tls_verify"` // https proxy only
-		PathPatterns []string                 `json:"path_patterns,omitempty" yaml:"path_patterns"` // http(s) proxy only
-		HealthCheck  health.HealthCheckConfig `json:"healthcheck,omitempty" yaml:"healthcheck"`
-		LoadBalance  loadbalancer.Config      `json:"load_balance,omitempty" yaml:"load_balance"`
-		Middlewares  docker.NestedLabelMap    `json:"middlewares,omitempty" yaml:"middlewares"`
-		Homepage     *homepage.Item           `json:"homepage,omitempty" yaml:"homepage"`
+		Alias        string                    `json:"-" yaml:"-"`
+		Scheme       string                    `json:"scheme,omitempty" yaml:"scheme"`
+		Host         string                    `json:"host,omitempty" yaml:"host"`
+		Port         string                    `json:"port,omitempty" yaml:"port"`
+		NoTLSVerify  bool                      `json:"no_tls_verify,omitempty" yaml:"no_tls_verify"` // https proxy only
+		PathPatterns []string                  `json:"path_patterns,omitempty" yaml:"path_patterns"` // http(s) proxy only
+		HealthCheck  *health.HealthCheckConfig `json:"healthcheck,omitempty" yaml:"healthcheck"`
+		LoadBalance  *loadbalancer.Config      `json:"load_balance,omitempty" yaml:"load_balance"`
+		Middlewares  docker.NestedLabelMap     `json:"middlewares,omitempty" yaml:"middlewares"`
+		Homepage     *homepage.Item            `json:"homepage,omitempty" yaml:"homepage"`
 
 		/* Docker only */
 		Container *docker.Container `json:"container,omitempty" yaml:"-"`
@@ -122,29 +122,41 @@ func (e *RawEntry) FillMissingFields() {
 		}
 	}
 
-	if e.HealthCheck.Interval == 0 {
-		e.HealthCheck.Interval = common.HealthCheckIntervalDefault
+	if e.HealthCheck == nil {
+		e.HealthCheck = new(health.HealthCheckConfig)
 	}
-	if e.HealthCheck.Timeout == 0 {
-		e.HealthCheck.Timeout = common.HealthCheckTimeoutDefault
+
+	if e.HealthCheck.Disabled {
+		e.HealthCheck = nil
+	} else {
+		if e.HealthCheck.Interval == 0 {
+			e.HealthCheck.Interval = common.HealthCheckIntervalDefault
+		}
+		if e.HealthCheck.Timeout == 0 {
+			e.HealthCheck.Timeout = common.HealthCheckTimeoutDefault
+		}
 	}
-	if cont.IdleTimeout == "" {
-		cont.IdleTimeout = common.IdleTimeoutDefault
-	}
-	if cont.WakeTimeout == "" {
-		cont.WakeTimeout = common.WakeTimeoutDefault
-	}
-	if cont.StopTimeout == "" {
-		cont.StopTimeout = common.StopTimeoutDefault
-	}
-	if cont.StopMethod == "" {
-		cont.StopMethod = common.StopMethodDefault
+
+	if cont.IdleTimeout != "" {
+		if cont.WakeTimeout == "" {
+			cont.WakeTimeout = common.WakeTimeoutDefault
+		}
+		if cont.StopTimeout == "" {
+			cont.StopTimeout = common.StopTimeoutDefault
+		}
+		if cont.StopMethod == "" {
+			cont.StopMethod = common.StopMethodDefault
+		}
 	}
 
 	e.Port = joinPorts(lp, pp, extra)
 
 	if e.Port == "" || e.Host == "" {
-		e.Port = "0"
+		if lp != "" {
+			e.Port = lp + ":0"
+		} else {
+			e.Port = "0"
+		}
 	}
 }
 

internal/proxy/entry/reverse_proxy.go

@@ -0,0 +1,98 @@
+package entry
+
+import (
+	"fmt"
+	"net/url"
+
+	"github.com/yusing/go-proxy/internal/docker"
+	idlewatcher "github.com/yusing/go-proxy/internal/docker/idlewatcher/config"
+	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/net/http/loadbalancer"
+	net "github.com/yusing/go-proxy/internal/net/types"
+	"github.com/yusing/go-proxy/internal/proxy/fields"
+	"github.com/yusing/go-proxy/internal/watcher/health"
+)
+
+type ReverseProxyEntry struct { // real model after validation
+	Raw *RawEntry `json:"raw"`
+
+	Alias        fields.Alias              `json:"alias,omitempty"`
+	Scheme       fields.Scheme             `json:"scheme,omitempty"`
+	URL          net.URL                   `json:"url,omitempty"`
+	NoTLSVerify  bool                      `json:"no_tls_verify,omitempty"`
+	PathPatterns fields.PathPatterns       `json:"path_patterns,omitempty"`
+	HealthCheck  *health.HealthCheckConfig `json:"healthcheck,omitempty"`
+	LoadBalance  *loadbalancer.Config      `json:"load_balance,omitempty"`
+	Middlewares  docker.NestedLabelMap     `json:"middlewares,omitempty"`
+
+	/* Docker only */
+	Idlewatcher *idlewatcher.Config `json:"idlewatcher,omitempty"`
+}
+
+func (rp *ReverseProxyEntry) TargetName() string {
+	return string(rp.Alias)
+}
+
+func (rp *ReverseProxyEntry) TargetURL() net.URL {
+	return rp.URL
+}
+
+func (rp *ReverseProxyEntry) RawEntry() *RawEntry {
+	return rp.Raw
+}
+
+func (rp *ReverseProxyEntry) LoadBalanceConfig() *loadbalancer.Config {
+	return rp.LoadBalance
+}
+
+func (rp *ReverseProxyEntry) HealthCheckConfig() *health.HealthCheckConfig {
+	return rp.HealthCheck
+}
+
+func (rp *ReverseProxyEntry) IdlewatcherConfig() *idlewatcher.Config {
+	return rp.Idlewatcher
+}
+
+func validateRPEntry(m *RawEntry, s fields.Scheme, b E.Builder) *ReverseProxyEntry {
+	cont := m.Container
+	if cont == nil {
+		cont = docker.DummyContainer
+	}
+
+	lb := m.LoadBalance
+	if lb != nil && lb.Link == "" {
+		lb = nil
+	}
+
+	host, err := fields.ValidateHost(m.Host)
+	b.Add(err)
+
+	port, err := fields.ValidatePort(m.Port)
+	b.Add(err)
+
+	pathPatterns, err := fields.ValidatePathPatterns(m.PathPatterns)
+	b.Add(err)
+
+	url, err := E.Check(url.Parse(fmt.Sprintf("%s://%s:%d", s, host, port)))
+	b.Add(err)
+
+	idleWatcherCfg, err := idlewatcher.ValidateConfig(m.Container)
+	b.Add(err)
+
+	if err != nil {
+		return nil
+	}
+
+	return &ReverseProxyEntry{
+		Raw:          m,
+		Alias:        fields.NewAlias(m.Alias),
+		Scheme:       s,
+		URL:          net.NewURL(url),
+		NoTLSVerify:  m.NoTLSVerify,
+		PathPatterns: pathPatterns,
+		HealthCheck:  m.HealthCheck,
+		LoadBalance:  lb,
+		Middlewares:  m.Middlewares,
+		Idlewatcher:  idleWatcherCfg,
+	}
+}

internal/proxy/entry/stream.go

@@ -0,0 +1,89 @@
+package entry
+
+import (
+	"fmt"
+
+	"github.com/yusing/go-proxy/internal/docker"
+	idlewatcher "github.com/yusing/go-proxy/internal/docker/idlewatcher/config"
+	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/net/http/loadbalancer"
+	net "github.com/yusing/go-proxy/internal/net/types"
+	"github.com/yusing/go-proxy/internal/proxy/fields"
+	"github.com/yusing/go-proxy/internal/watcher/health"
+)
+
+type StreamEntry struct {
+	Raw *RawEntry `json:"raw"`
+
+	Alias       fields.Alias              `json:"alias,omitempty"`
+	Scheme      fields.StreamScheme       `json:"scheme,omitempty"`
+	URL         net.URL                   `json:"url,omitempty"`
+	Host        fields.Host               `json:"host,omitempty"`
+	Port        fields.StreamPort         `json:"port,omitempty"`
+	HealthCheck *health.HealthCheckConfig `json:"healthcheck,omitempty"`
+
+	/* Docker only */
+	Idlewatcher *idlewatcher.Config `json:"idlewatcher,omitempty"`
+}
+
+func (s *StreamEntry) TargetName() string {
+	return string(s.Alias)
+}
+
+func (s *StreamEntry) TargetURL() net.URL {
+	return s.URL
+}
+
+func (s *StreamEntry) RawEntry() *RawEntry {
+	return s.Raw
+}
+
+func (s *StreamEntry) LoadBalanceConfig() *loadbalancer.Config {
+	// TODO: support stream load balance
+	return nil
+}
+
+func (s *StreamEntry) HealthCheckConfig() *health.HealthCheckConfig {
+	return s.HealthCheck
+}
+
+func (s *StreamEntry) IdlewatcherConfig() *idlewatcher.Config {
+	return s.Idlewatcher
+}
+
+func validateStreamEntry(m *RawEntry, b E.Builder) *StreamEntry {
+	cont := m.Container
+	if cont == nil {
+		cont = docker.DummyContainer
+	}
+
+	host, err := fields.ValidateHost(m.Host)
+	b.Add(err)
+
+	port, err := fields.ValidateStreamPort(m.Port)
+	b.Add(err)
+
+	scheme, err := fields.ValidateStreamScheme(m.Scheme)
+	b.Add(err)
+
+	url, err := E.Check(net.ParseURL(fmt.Sprintf("%s://%s:%d", scheme.ProxyScheme, m.Host, port.ProxyPort)))
+	b.Add(err)
+
+	idleWatcherCfg, err := idlewatcher.ValidateConfig(m.Container)
+	b.Add(err)
+
+	if b.HasError() {
+		return nil
+	}
+
+	return &StreamEntry{
+		Raw:         m,
+		Alias:       fields.NewAlias(m.Alias),
+		Scheme:      *scheme,
+		URL:         url,
+		Host:        host,
+		Port:        port,
+		HealthCheck: m.HealthCheck,
+		Idlewatcher: idleWatcherCfg,
+	}
+}

internal/proxy/fields/signal.go

@@ -1,17 +0,0 @@
-package fields
-
-import (
-	E "github.com/yusing/go-proxy/internal/error"
-)
-
-type Signal string
-
-func ValidateSignal(s string) (Signal, E.NestedError) {
-	switch s {
-	case "", "SIGINT", "SIGTERM", "SIGHUP", "SIGQUIT",
-		"INT", "TERM", "HUP", "QUIT":
-		return Signal(s), nil
-	}
-
-	return "", E.Invalid("signal", s)
-}

internal/proxy/fields/stop_method.go

@@ -1,23 +0,0 @@
-package fields
-
-import (
-	E "github.com/yusing/go-proxy/internal/error"
-)
-
-type StopMethod string
-
-const (
-	StopMethodPause StopMethod = "pause"
-	StopMethodStop  StopMethod = "stop"
-	StopMethodKill  StopMethod = "kill"
-)
-
-func ValidateStopMethod(s string) (StopMethod, E.NestedError) {
-	sm := StopMethod(s)
-	switch sm {
-	case StopMethodPause, StopMethodStop, StopMethodKill:
-		return sm, nil
-	default:
-		return "", E.Invalid("stop_method", sm)
-	}
-}

internal/proxy/fields/timeout.go

@@ -1,18 +0,0 @@
-package fields
-
-import (
-	"time"
-
-	E "github.com/yusing/go-proxy/internal/error"
-)
-
-func ValidateDurationPostitive(value string) (time.Duration, E.NestedError) {
-	d, err := time.ParseDuration(value)
-	if err != nil {
-		return 0, E.Invalid("duration", value)
-	}
-	if d < 0 {
-		return 0, E.Invalid("duration", "negative value")
-	}
-	return d, nil
-}

internal/route/http.go

@@ -9,23 +9,21 @@ import (
 
 	"github.com/sirupsen/logrus"
 	"github.com/yusing/go-proxy/internal/api/v1/errorpage"
-	"github.com/yusing/go-proxy/internal/common"
 	"github.com/yusing/go-proxy/internal/docker/idlewatcher"
 	E "github.com/yusing/go-proxy/internal/error"
 	gphttp "github.com/yusing/go-proxy/internal/net/http"
 	"github.com/yusing/go-proxy/internal/net/http/loadbalancer"
 	"github.com/yusing/go-proxy/internal/net/http/middleware"
-	url "github.com/yusing/go-proxy/internal/net/types"
-	P "github.com/yusing/go-proxy/internal/proxy"
+	"github.com/yusing/go-proxy/internal/proxy/entry"
 	PT "github.com/yusing/go-proxy/internal/proxy/fields"
-	"github.com/yusing/go-proxy/internal/types"
+	"github.com/yusing/go-proxy/internal/task"
 	F "github.com/yusing/go-proxy/internal/utils/functional"
 	"github.com/yusing/go-proxy/internal/watcher/health"
 )
 
 type (
 	HTTPRoute struct {
-		*P.ReverseProxyEntry
+		*entry.ReverseProxyEntry
 
 		HealthMon health.HealthMonitor `json:"health,omitempty"`
 
@@ -33,6 +31,8 @@ type (
 		server       *loadbalancer.Server
 		handler      http.Handler
 		rp           *gphttp.ReverseProxy
+
+		task task.Task
 	}
 
 	SubdomainKey = PT.Alias
@@ -66,7 +66,7 @@ func SetFindMuxDomains(domains []string) {
 	}
 }
 
-func NewHTTPRoute(entry *P.ReverseProxyEntry) (*HTTPRoute, E.NestedError) {
+func NewHTTPRoute(entry *entry.ReverseProxyEntry) (impl, E.NestedError) {
 	var trans *http.Transport
 
 	if entry.NoTLSVerify {
@@ -84,12 +84,10 @@ func NewHTTPRoute(entry *P.ReverseProxyEntry) (*HTTPRoute, E.NestedError) {
 		}
 	}
 
-	httpRoutesMu.Lock()
-	defer httpRoutesMu.Unlock()
-
 	r := &HTTPRoute{
 		ReverseProxyEntry: entry,
 		rp:                rp,
+		task:              task.DummyTask(),
 	}
 	return r, nil
 }
@@ -98,39 +96,34 @@ func (r *HTTPRoute) String() string {
 	return string(r.Alias)
 }
 
-func (r *HTTPRoute) URL() url.URL {
-	return r.ReverseProxyEntry.URL
-}
-
-func (r *HTTPRoute) Start() E.NestedError {
-	if r.ShouldNotServe() {
+// Start implements task.TaskStarter.
+func (r *HTTPRoute) Start(providerSubtask task.Task) E.NestedError {
+	if entry.ShouldNotServe(r) {
+		providerSubtask.Finish("should not serve")
 		return nil
 	}
 
 	httpRoutesMu.Lock()
 	defer httpRoutesMu.Unlock()
 
-	if r.handler != nil {
-		return nil
-	}
-
-	if r.HealthCheck.Disabled && (r.UseIdleWatcher() || r.UseLoadBalance()) {
+	if r.HealthCheck.Disabled && (entry.UseLoadBalance(r) || entry.UseIdleWatcher(r)) {
 		logrus.Warnf("%s.healthCheck.disabled cannot be false when loadbalancer or idlewatcher is enabled", r.Alias)
 		r.HealthCheck.Disabled = true
 	}
 
 	switch {
-	case r.UseIdleWatcher():
-		watcher, err := idlewatcher.Register(r.ReverseProxyEntry)
+	case entry.UseIdleWatcher(r):
+		wakerTask := providerSubtask.Parent().Subtask("waker for " + string(r.Alias))
+		waker, err := idlewatcher.NewHTTPWaker(wakerTask, r.ReverseProxyEntry, r.rp)
 		if err != nil {
 			return err
 		}
-		waker := idlewatcher.NewWaker(watcher, r.rp)
 		r.handler = waker
 		r.HealthMon = waker
-	case !r.HealthCheck.Disabled:
-		r.HealthMon = health.NewHTTPHealthMonitor(common.GlobalTask(r.String()), r.URL(), r.HealthCheck)
+	case entry.UseHealthCheck(r):
+		r.HealthMon = health.NewHTTPHealthMonitor(r.TargetURL(), r.HealthCheck, r.rp.Transport)
 	}
+	r.task = providerSubtask
 
 	if r.handler == nil {
 		switch {
@@ -146,44 +139,26 @@ func (r *HTTPRoute) Start() E.NestedError {
 	}
 
 	if r.HealthMon != nil {
-		r.HealthMon.Start()
+		if err := r.HealthMon.Start(r.task.Subtask("health monitor")); err != nil {
+			logrus.Warn(E.FailWith("health monitor", err))
+		}
 	}
 
-	if r.UseLoadBalance() {
+	if entry.UseLoadBalance(r) {
 		r.addToLoadBalancer()
 	} else {
 		httpRoutes.Store(string(r.Alias), r)
+		r.task.OnComplete("stop rp", func() {
+			httpRoutes.Delete(string(r.Alias))
+		})
 	}
 
 	return nil
 }
 
-func (r *HTTPRoute) Stop() (_ E.NestedError) {
-	if r.handler == nil {
-		return
-	}
-
-	httpRoutesMu.Lock()
-	defer httpRoutesMu.Unlock()
-
-	if r.loadBalancer != nil {
-		r.removeFromLoadBalancer()
-	} else {
-		httpRoutes.Delete(string(r.Alias))
-	}
-
-	if r.HealthMon != nil {
-		r.HealthMon.Stop()
-		r.HealthMon = nil
-	}
-
-	r.handler = nil
-
-	return
-}
-
-func (r *HTTPRoute) Started() bool {
-	return r.handler != nil
+// Finish implements task.TaskFinisher.
+func (r *HTTPRoute) Finish(reason string) {
+	r.task.Finish(reason)
 }
 
 func (r *HTTPRoute) addToLoadBalancer() {
@@ -197,10 +172,14 @@ func (r *HTTPRoute) addToLoadBalancer() {
 		}
 	} else {
 		lb = loadbalancer.New(r.LoadBalance)
-		lb.Start()
+		lbTask := r.task.Parent().Subtask("loadbalancer %s", r.LoadBalance.Link)
+		lbTask.OnComplete("remove lb from routes", func() {
+			httpRoutes.Delete(r.LoadBalance.Link)
+		})
+		lb.Start(lbTask)
 		linked = &HTTPRoute{
-			ReverseProxyEntry: &P.ReverseProxyEntry{
-				Raw: &types.RawEntry{
+			ReverseProxyEntry: &entry.ReverseProxyEntry{
+				Raw: &entry.RawEntry{
 					Homepage: r.Raw.Homepage,
 				},
 				Alias: PT.Alias(lb.Link),
@@ -214,16 +193,9 @@ func (r *HTTPRoute) addToLoadBalancer() {
 	r.loadBalancer = lb
 	r.server = loadbalancer.NewServer(string(r.Alias), r.rp.TargetURL, r.LoadBalance.Weight, r.handler, r.HealthMon)
 	lb.AddServer(r.server)
-}
-
-func (r *HTTPRoute) removeFromLoadBalancer() {
-	r.loadBalancer.RemoveServer(r.server)
-	if r.loadBalancer.IsEmpty() {
-		httpRoutes.Delete(r.LoadBalance.Link)
-		logrus.Debugf("loadbalancer %q removed from route table", r.LoadBalance.Link)
-	}
-	r.server = nil
-	r.loadBalancer = nil
+	r.task.OnComplete("remove server from lb", func() {
+		lb.RemoveServer(r.server)
+	})
 }
 
 func ProxyHandler(w http.ResponseWriter, r *http.Request) {

internal/route/provider/docker.go

@@ -10,10 +10,9 @@ import (
 	"github.com/yusing/go-proxy/internal/common"
 	D "github.com/yusing/go-proxy/internal/docker"
 	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/proxy/entry"
 	R "github.com/yusing/go-proxy/internal/route"
-	"github.com/yusing/go-proxy/internal/types"
 	W "github.com/yusing/go-proxy/internal/watcher"
-	"github.com/yusing/go-proxy/internal/watcher/events"
 )
 
 type DockerProvider struct {
@@ -43,7 +42,7 @@ func (p *DockerProvider) NewWatcher() W.Watcher {
 
 func (p *DockerProvider) LoadRoutesImpl() (routes R.Routes, err E.NestedError) {
 	routes = R.NewRoutes()
-	entries := types.NewProxyEntries()
+	entries := entry.NewProxyEntries()
 
 	info, err := D.GetClientInfo(p.dockerHost, true)
 	if err != nil {
@@ -66,12 +65,12 @@ func (p *DockerProvider) LoadRoutesImpl() (routes R.Routes, err E.NestedError) {
 		// there may be some valid entries in `en`
 		dups := entries.MergeFrom(newEntries)
 		// add the duplicate proxy entries to the error
-		dups.RangeAll(func(k string, v *types.RawEntry) {
+		dups.RangeAll(func(k string, v *entry.RawEntry) {
 			errors.Addf("duplicate alias %s", k)
 		})
 	}
 
-	entries.RangeAll(func(_ string, e *types.RawEntry) {
+	entries.RangeAll(func(_ string, e *entry.RawEntry) {
 		e.Container.DockerHost = p.dockerHost
 	})
 
@@ -88,85 +87,10 @@ func (p *DockerProvider) shouldIgnore(container *D.Container) bool {
 		strings.HasSuffix(container.ContainerName, "-old")
 }
 
-func (p *DockerProvider) OnEvent(event W.Event, oldRoutes R.Routes) (res EventResult) {
-	b := E.NewBuilder("event %s error", event)
-	defer b.To(&res.err)
-
-	matches := R.NewRoutes()
-	oldRoutes.RangeAllParallel(func(k string, v *R.Route) {
-		if v.Entry.Container.ContainerID == event.ActorID ||
-			v.Entry.Container.ContainerName == event.ActorName {
-			matches.Store(k, v)
-		}
-	})
-	//FIXME: docker event die stuck
-
-	var newRoutes R.Routes
-	var err E.NestedError
-
-	switch {
-	// id & container name changed
-	case matches.Size() == 0:
-		matches = oldRoutes
-		newRoutes, err = p.LoadRoutesImpl()
-		b.Add(err)
-	case event.Action == events.ActionContainerDestroy:
-		// stop all old routes
-		matches.RangeAllParallel(func(_ string, v *R.Route) {
-			oldRoutes.Delete(v.Entry.Alias)
-			b.Add(v.Stop())
-			res.nRemoved++
-		})
-		return
-	default:
-		cont, err := D.Inspect(p.dockerHost, event.ActorID)
-		if err != nil {
-			b.Add(E.FailWith("inspect container", err))
-			return
-		}
-
-		if p.shouldIgnore(cont) {
-			// stop all old routes
-			matches.RangeAllParallel(func(_ string, v *R.Route) {
-				b.Add(v.Stop())
-				res.nRemoved++
-			})
-			return
-		}
-
-		entries, err := p.entriesFromContainerLabels(cont)
-		b.Add(err)
-		newRoutes, err = R.FromEntries(entries)
-		b.Add(err)
-	}
-
-	matches.RangeAll(func(k string, v *R.Route) {
-		if !newRoutes.Has(k) && !oldRoutes.Has(k) {
-			b.Add(v.Stop())
-			matches.Delete(k)
-			res.nRemoved++
-		}
-	})
-
-	newRoutes.RangeAll(func(alias string, newRoute *R.Route) {
-		oldRoute, exists := oldRoutes.Load(alias)
-		if exists {
-			b.Add(oldRoute.Stop())
-			res.nReloaded++
-		} else {
-			res.nAdded++
-		}
-		b.Add(newRoute.Start())
-		oldRoutes.Store(alias, newRoute)
-	})
-
-	return
-}
-
 // Returns a list of proxy entries for a container.
 // Always non-nil.
-func (p *DockerProvider) entriesFromContainerLabels(container *D.Container) (entries types.RawEntries, _ E.NestedError) {
-	entries = types.NewProxyEntries()
+func (p *DockerProvider) entriesFromContainerLabels(container *D.Container) (entries entry.RawEntries, _ E.NestedError) {
+	entries = entry.NewProxyEntries()
 
 	if p.shouldIgnore(container) {
 		return
@@ -174,7 +98,7 @@ func (p *DockerProvider) entriesFromContainerLabels(container *D.Container) (ent
 
 	// init entries map for all aliases
 	for _, a := range container.Aliases {
-		entries.Store(a, &types.RawEntry{
+		entries.Store(a, &entry.RawEntry{
 			Alias:     a,
 			Container: container,
 		})
@@ -186,14 +110,14 @@ func (p *DockerProvider) entriesFromContainerLabels(container *D.Container) (ent
 	}
 
 	// remove all entries that failed to fill in missing fields
-	entries.RangeAll(func(_ string, re *types.RawEntry) {
+	entries.RangeAll(func(_ string, re *entry.RawEntry) {
 		re.FillMissingFields()
 	})
 
 	return entries, errors.Build().Subject(container.ContainerName)
 }
 
-func (p *DockerProvider) applyLabel(container *D.Container, entries types.RawEntries, key, val string) (res E.NestedError) {
+func (p *DockerProvider) applyLabel(container *D.Container, entries entry.RawEntries, key, val string) (res E.NestedError) {
 	b := E.NewBuilder("errors in label %s", key)
 	defer b.To(&res)
 
@@ -220,7 +144,7 @@ func (p *DockerProvider) applyLabel(container *D.Container, entries types.RawEnt
 	}
 	if lbl.Target == D.WildcardAlias {
 		// apply label for all aliases
-		entries.RangeAll(func(a string, e *types.RawEntry) {
+		entries.RangeAll(func(a string, e *entry.RawEntry) {
 			if err = D.ApplyLabel(e, lbl); err != nil {
 				b.Add(err)
 			}

internal/route/provider/docker_test.go

@@ -10,7 +10,7 @@ import (
 	"github.com/yusing/go-proxy/internal/common"
 	D "github.com/yusing/go-proxy/internal/docker"
 	E "github.com/yusing/go-proxy/internal/error"
-	P "github.com/yusing/go-proxy/internal/proxy"
+	"github.com/yusing/go-proxy/internal/proxy/entry"
 	T "github.com/yusing/go-proxy/internal/proxy/fields"
 	. "github.com/yusing/go-proxy/internal/utils/testing"
 )
@@ -46,7 +46,7 @@ func TestApplyLabelWildcard(t *testing.T) {
 		Names: dummyNames,
 		Labels: map[string]string{
 			D.LabelAliases:                          "a,b",
-			D.LabelIdleTimeout:                      common.IdleTimeoutDefault,
+			D.LabelIdleTimeout:                      "",
 			D.LabelStopMethod:                       common.StopMethodDefault,
 			D.LabelStopSignal:                       "SIGTERM",
 			D.LabelStopTimeout:                      common.StopTimeoutDefault,
@@ -62,7 +62,7 @@ func TestApplyLabelWildcard(t *testing.T) {
 			"proxy.a.middlewares.middleware2.prop3": "value3",
 			"proxy.a.middlewares.middleware2.prop4": "value4",
 		},
-	}, ""))
+	}, client.DefaultDockerHost))
 	ExpectNoError(t, err.Error())
 
 	a, ok := entries.Load("a")
@@ -88,8 +88,8 @@ func TestApplyLabelWildcard(t *testing.T) {
 	ExpectDeepEqual(t, a.Middlewares, middlewaresExpect)
 	ExpectEqual(t, len(b.Middlewares), 0)
 
-	ExpectEqual(t, a.Container.IdleTimeout, common.IdleTimeoutDefault)
-	ExpectEqual(t, b.Container.IdleTimeout, common.IdleTimeoutDefault)
+	ExpectEqual(t, a.Container.IdleTimeout, "")
+	ExpectEqual(t, b.Container.IdleTimeout, "")
 
 	ExpectEqual(t, a.Container.StopTimeout, common.StopTimeoutDefault)
 	ExpectEqual(t, b.Container.StopTimeout, common.StopTimeoutDefault)
@@ -107,6 +107,7 @@ func TestApplyLabelWildcard(t *testing.T) {
 func TestApplyLabelWithAlias(t *testing.T) {
 	entries, err := p.entriesFromContainerLabels(D.FromDocker(&types.Container{
 		Names: dummyNames,
+		State: "running",
 		Labels: map[string]string{
 			D.LabelAliases:          "a,b,c",
 			"proxy.a.no_tls_verify": "true",
@@ -114,7 +115,7 @@ func TestApplyLabelWithAlias(t *testing.T) {
 			"proxy.b.port":          "1234",
 			"proxy.c.scheme":        "https",
 		},
-	}, ""))
+	}, client.DefaultDockerHost))
 	a, ok := entries.Load("a")
 	ExpectTrue(t, ok)
 	b, ok := entries.Load("b")
@@ -134,6 +135,7 @@ func TestApplyLabelWithAlias(t *testing.T) {
 func TestApplyLabelWithRef(t *testing.T) {
 	entries := Must(p.entriesFromContainerLabels(D.FromDocker(&types.Container{
 		Names: dummyNames,
+		State: "running",
 		Labels: map[string]string{
 			D.LabelAliases:    "a,b,c",
 			"proxy.#1.host":   "localhost",
@@ -142,7 +144,7 @@ func TestApplyLabelWithRef(t *testing.T) {
 			"proxy.#3.port":   "1111",
 			"proxy.#3.scheme": "https",
 		},
-	}, "")))
+	}, client.DefaultDockerHost)))
 	a, ok := entries.Load("a")
 	ExpectTrue(t, ok)
 	b, ok := entries.Load("b")
@@ -161,6 +163,7 @@ func TestApplyLabelWithRef(t *testing.T) {
 func TestApplyLabelWithRefIndexError(t *testing.T) {
 	c := D.FromDocker(&types.Container{
 		Names: dummyNames,
+		State: "running",
 		Labels: map[string]string{
 			D.LabelAliases:    "a,b",
 			"proxy.#1.host":   "localhost",
@@ -173,6 +176,7 @@ func TestApplyLabelWithRefIndexError(t *testing.T) {
 
 	_, err = p.entriesFromContainerLabels(D.FromDocker(&types.Container{
 		Names: dummyNames,
+		State: "running",
 		Labels: map[string]string{
 			D.LabelAliases:  "a,b",
 			"proxy.#0.host": "localhost",
@@ -183,7 +187,7 @@ func TestApplyLabelWithRefIndexError(t *testing.T) {
 }
 
 func TestPublicIPLocalhost(t *testing.T) {
-	c := D.FromDocker(&types.Container{Names: dummyNames}, client.DefaultDockerHost)
+	c := D.FromDocker(&types.Container{Names: dummyNames, State: "running"}, client.DefaultDockerHost)
 	raw, ok := Must(p.entriesFromContainerLabels(c)).Load("a")
 	ExpectTrue(t, ok)
 	ExpectEqual(t, raw.Container.PublicIP, "127.0.0.1")
@@ -191,7 +195,7 @@ func TestPublicIPLocalhost(t *testing.T) {
 }
 
 func TestPublicIPRemote(t *testing.T) {
-	c := D.FromDocker(&types.Container{Names: dummyNames}, "tcp://1.2.3.4:2375")
+	c := D.FromDocker(&types.Container{Names: dummyNames, State: "running"}, "tcp://1.2.3.4:2375")
 	raw, ok := Must(p.entriesFromContainerLabels(c)).Load("a")
 	ExpectTrue(t, ok)
 	ExpectEqual(t, raw.Container.PublicIP, "1.2.3.4")
@@ -218,6 +222,7 @@ func TestPrivateIPLocalhost(t *testing.T) {
 func TestPrivateIPRemote(t *testing.T) {
 	c := D.FromDocker(&types.Container{
 		Names: dummyNames,
+		State: "running",
 		NetworkSettings: &types.SummaryNetworkSettings{
 			Networks: map[string]*network.EndpointSettings{
 				"network": {
@@ -239,6 +244,7 @@ func TestStreamDefaultValues(t *testing.T) {
 	privIP := "172.17.0.123"
 	cont := &types.Container{
 		Names: []string{"a"},
+		State: "running",
 		NetworkSettings: &types.SummaryNetworkSettings{
 			Networks: map[string]*network.EndpointSettings{
 				"network": {
@@ -256,9 +262,8 @@ func TestStreamDefaultValues(t *testing.T) {
 
 		raw, ok := Must(p.entriesFromContainerLabels(c)).Load("a")
 		ExpectTrue(t, ok)
-		entry := Must(P.ValidateEntry(raw))
-
-		a := ExpectType[*P.StreamEntry](t, entry)
+		en := Must(entry.ValidateEntry(raw))
+		a := ExpectType[*entry.StreamEntry](t, en)
 		ExpectEqual(t, a.Scheme.ListeningScheme, T.Scheme("udp"))
 		ExpectEqual(t, a.Scheme.ProxyScheme, T.Scheme("udp"))
 		ExpectEqual(t, a.Host, T.Host(privIP))
@@ -270,9 +275,8 @@ func TestStreamDefaultValues(t *testing.T) {
 		c := D.FromDocker(cont, "tcp://1.2.3.4:2375")
 		raw, ok := Must(p.entriesFromContainerLabels(c)).Load("a")
 		ExpectTrue(t, ok)
-		entry := Must(P.ValidateEntry(raw))
-
-		a := ExpectType[*P.StreamEntry](t, entry)
+		en := Must(entry.ValidateEntry(raw))
+		a := ExpectType[*entry.StreamEntry](t, en)
 		ExpectEqual(t, a.Scheme.ListeningScheme, T.Scheme("udp"))
 		ExpectEqual(t, a.Scheme.ProxyScheme, T.Scheme("udp"))
 		ExpectEqual(t, a.Host, "1.2.3.4")

internal/route/provider/event_handler.go

@@ -0,0 +1,109 @@
+package provider
+
+import (
+	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/route"
+	"github.com/yusing/go-proxy/internal/task"
+	"github.com/yusing/go-proxy/internal/watcher"
+)
+
+type EventHandler struct {
+	provider *Provider
+
+	added   []string
+	removed []string
+	paused  []string
+	updated []string
+	errs    E.Builder
+}
+
+func (provider *Provider) newEventHandler() *EventHandler {
+	return &EventHandler{
+		provider: provider,
+		errs:     E.NewBuilder("event errors"),
+	}
+}
+
+func (handler *EventHandler) Handle(parent task.Task, events []watcher.Event) {
+	oldRoutes := handler.provider.routes
+	newRoutes, err := handler.provider.LoadRoutesImpl()
+	if err != nil {
+		handler.errs.Add(err.Subject("load routes"))
+		return
+	}
+
+	oldRoutes.RangeAll(func(k string, v *route.Route) {
+		if !newRoutes.Has(k) {
+			handler.Remove(v)
+		}
+	})
+	newRoutes.RangeAll(func(k string, newr *route.Route) {
+		if oldRoutes.Has(k) {
+			for _, ev := range events {
+				if handler.match(ev, newr) {
+					old, ok := oldRoutes.Load(k)
+					if !ok { // should not happen
+						panic("race condition")
+					}
+					handler.Update(parent, old, newr)
+					return
+				}
+			}
+		} else {
+			handler.Add(parent, newr)
+		}
+	})
+}
+
+func (handler *EventHandler) match(event watcher.Event, route *route.Route) bool {
+	switch handler.provider.t {
+	case ProviderTypeDocker:
+		return route.Entry.Container.ContainerID == event.ActorID ||
+			route.Entry.Container.ContainerName == event.ActorName
+	case ProviderTypeFile:
+		return true
+	}
+	// should never happen
+	return false
+}
+
+func (handler *EventHandler) Add(parent task.Task, route *route.Route) {
+	err := handler.provider.startRoute(parent, route)
+	if err != nil {
+		handler.errs.Add(err)
+	} else {
+		handler.added = append(handler.added, route.Entry.Alias)
+	}
+}
+
+func (handler *EventHandler) Remove(route *route.Route) {
+	route.Finish("route removal")
+	handler.removed = append(handler.removed, route.Entry.Alias)
+}
+
+func (handler *EventHandler) Update(parent task.Task, oldRoute *route.Route, newRoute *route.Route) {
+	oldRoute.Finish("route update")
+	err := handler.provider.startRoute(parent, newRoute)
+	if err != nil {
+		handler.errs.Add(err)
+	} else {
+		handler.updated = append(handler.updated, newRoute.Entry.Alias)
+	}
+}
+
+func (handler *EventHandler) Log() {
+	results := E.NewBuilder("event occured")
+	for _, alias := range handler.added {
+		results.Addf("added %s", alias)
+	}
+	for _, alias := range handler.removed {
+		results.Addf("removed %s", alias)
+	}
+	for _, alias := range handler.updated {
+		results.Addf("updated %s", alias)
+	}
+	results.Add(handler.errs.Build())
+	if result := results.Build(); result != nil {
+		handler.provider.l.Info(result)
+	}
+}

internal/route/provider/file.go

@@ -7,8 +7,8 @@ import (
 
 	"github.com/yusing/go-proxy/internal/common"
 	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/proxy/entry"
 	R "github.com/yusing/go-proxy/internal/route"
-	"github.com/yusing/go-proxy/internal/types"
 	U "github.com/yusing/go-proxy/internal/utils"
 	W "github.com/yusing/go-proxy/internal/watcher"
 )
@@ -42,38 +42,13 @@ func (p FileProvider) String() string {
 	return p.fileName
 }
 
-func (p FileProvider) OnEvent(event W.Event, routes R.Routes) (res EventResult) {
-	b := E.NewBuilder("event %s error", event)
-	defer b.To(&res.err)
-
-	newRoutes, err := p.LoadRoutesImpl()
-	if err != nil {
-		b.Add(err)
-		return
-	}
-
-	res.nRemoved = newRoutes.Size()
-	routes.RangeAllParallel(func(_ string, v *R.Route) {
-		b.Add(v.Stop())
-	})
-	routes.Clear()
-
-	newRoutes.RangeAllParallel(func(_ string, v *R.Route) {
-		b.Add(v.Start())
-	})
-	res.nAdded = newRoutes.Size()
-
-	routes.MergeFrom(newRoutes)
-	return
-}
-
 func (p *FileProvider) LoadRoutesImpl() (routes R.Routes, res E.NestedError) {
 	routes = R.NewRoutes()
 
 	b := E.NewBuilder("file %q validation failure", p.fileName)
 	defer b.To(&res)
 
-	entries := types.NewProxyEntries()
+	entries := entry.NewProxyEntries()
 
 	data, err := E.Check(os.ReadFile(p.path))
 	if err != nil {

internal/route/provider/provider.go

@@ -1,14 +1,16 @@
 package provider
 
 import (
-	"context"
+	"fmt"
 	"path"
+	"time"
 
 	"github.com/sirupsen/logrus"
-	"github.com/yusing/go-proxy/internal/common"
 	E "github.com/yusing/go-proxy/internal/error"
 	R "github.com/yusing/go-proxy/internal/route"
+	"github.com/yusing/go-proxy/internal/task"
 	W "github.com/yusing/go-proxy/internal/watcher"
+	"github.com/yusing/go-proxy/internal/watcher/events"
 )
 
 type (
@@ -19,18 +21,14 @@ type (
 		t      ProviderType
 		routes R.Routes
 
-		watcher       W.Watcher
-		watcherTask   common.Task
-		watcherCancel context.CancelFunc
+		watcher W.Watcher
 
 		l *logrus.Entry
 	}
 	ProviderImpl interface {
+		fmt.Stringer
 		NewWatcher() W.Watcher
-		// even returns error, routes must be non-nil
 		LoadRoutesImpl() (R.Routes, E.NestedError)
-		OnEvent(event W.Event, routes R.Routes) EventResult
-		String() string
 	}
 	ProviderType  string
 	ProviderStats struct {
@@ -38,17 +36,13 @@ type (
 		NumStreams int          `json:"num_streams"`
 		Type       ProviderType `json:"type"`
 	}
-	EventResult struct {
-		nAdded    int
-		nRemoved  int
-		nReloaded int
-		err       E.NestedError
-	}
 )
 
 const (
 	ProviderTypeDocker ProviderType = "docker"
 	ProviderTypeFile   ProviderType = "file"
+
+	providerEventFlushInterval = 500 * time.Millisecond
 )
 
 func newProvider(name string, t ProviderType) *Provider {
@@ -106,32 +100,48 @@ func (p *Provider) MarshalText() ([]byte, error) {
 	return []byte(p.String()), nil
 }
 
-func (p *Provider) StartAllRoutes() (res E.NestedError) {
+func (p *Provider) startRoute(parent task.Task, r *R.Route) E.NestedError {
+	subtask := parent.Subtask("route %s", r.Entry.Alias)
+	err := r.Start(subtask)
+	if err != nil {
+		p.routes.Delete(r.Entry.Alias)
+		subtask.Finish(err.String()) // just to ensure
+		return err
+	} else {
+		subtask.OnComplete("del from provider", func() {
+			p.routes.Delete(r.Entry.Alias)
+		})
+	}
+	return nil
+}
+
+// Start implements task.TaskStarter.
+func (p *Provider) Start(configSubtask task.Task) (res E.NestedError) {
 	errors := E.NewBuilder("errors starting routes")
 	defer errors.To(&res)
 
-	// start watcher no matter load success or not
-	go p.watchEvents()
+	// routes and event queue will stop on parent cancel
+	providerTask := configSubtask
 
 	p.routes.RangeAllParallel(func(alias string, r *R.Route) {
-		errors.Add(r.Start().Subject(r))
+		errors.Add(p.startRoute(providerTask, r))
 	})
-	return
-}
 
-func (p *Provider) StopAllRoutes() (res E.NestedError) {
-	if p.watcherCancel != nil {
-		p.watcherCancel()
-		p.watcherCancel = nil
-	}
-
-	errors := E.NewBuilder("errors stopping routes")
-	defer errors.To(&res)
-
-	p.routes.RangeAllParallel(func(alias string, r *R.Route) {
-		errors.Add(r.Stop().Subject(r))
-	})
-	p.routes.Clear()
+	eventQueue := events.NewEventQueue(
+		providerTask,
+		providerEventFlushInterval,
+		func(flushTask task.Task, events []events.Event) {
+			handler := p.newEventHandler()
+			// routes' lifetime should follow the provider's lifetime
+			handler.Handle(providerTask, events)
+			handler.Log()
+			flushTask.Finish("events flushed")
+		},
+		func(err E.NestedError) {
+			p.l.Error(err)
+		},
+	)
+	eventQueue.Start(p.watcher.Events(providerTask.Context()))
 	return
 }
 
@@ -147,7 +157,6 @@ func (p *Provider) LoadRoutes() E.NestedError {
 	var err E.NestedError
 	p.routes, err = p.LoadRoutesImpl()
 	if p.routes.Size() > 0 {
-		p.l.Infof("loaded %d routes", p.routes.Size())
 		return err
 	}
 	if err == nil {
@@ -156,13 +165,14 @@ func (p *Provider) LoadRoutes() E.NestedError {
 	return E.FailWith("loading routes", err)
 }
 
+func (p *Provider) NumRoutes() int {
+	return p.routes.Size()
+}
+
 func (p *Provider) Statistics() ProviderStats {
 	numRPs := 0
 	numStreams := 0
 	p.routes.RangeAll(func(_ string, r *R.Route) {
-		if !r.Started() {
-			return
-		}
 		switch r.Type {
 		case R.RouteTypeReverseProxy:
 			numRPs++
@@ -176,34 +186,3 @@ func (p *Provider) Statistics() ProviderStats {
 		Type:       p.t,
 	}
 }
-
-func (p *Provider) watchEvents() {
-	p.watcherTask, p.watcherCancel = common.NewTaskWithCancel("Watcher for provider %s", p.name)
-	defer p.watcherTask.Finished()
-
-	events, errs := p.watcher.Events(p.watcherTask.Context())
-	l := p.l.WithField("module", "watcher")
-
-	for {
-		select {
-		case <-p.watcherTask.Context().Done():
-			return
-		case event := <-events:
-			task := p.watcherTask.Subtask("%s event %s", event.Type, event)
-			l.Infof("%s event %q", event.Type, event)
-			res := p.OnEvent(event, p.routes)
-			task.Finished()
-			if res.nAdded+res.nRemoved+res.nReloaded > 0 {
-				l.Infof("| %d NEW | %d REMOVED | %d RELOADED |", res.nAdded, res.nRemoved, res.nReloaded)
-			}
-			if res.err != nil {
-				l.Error(res.err)
-			}
-		case err := <-errs:
-			if err == nil || err.Is(context.Canceled) {
-				continue
-			}
-			l.Errorf("watcher error: %s", err)
-		}
-	}
-}

internal/route/route.go

@@ -4,8 +4,8 @@ import (
 	"github.com/yusing/go-proxy/internal/docker"
 	E "github.com/yusing/go-proxy/internal/error"
 	url "github.com/yusing/go-proxy/internal/net/types"
-	P "github.com/yusing/go-proxy/internal/proxy"
-	"github.com/yusing/go-proxy/internal/types"
+	"github.com/yusing/go-proxy/internal/proxy/entry"
+	"github.com/yusing/go-proxy/internal/task"
 	U "github.com/yusing/go-proxy/internal/utils"
 	F "github.com/yusing/go-proxy/internal/utils/functional"
 )
@@ -16,16 +16,16 @@ type (
 		_ U.NoCopy
 		impl
 		Type  RouteType
-		Entry *types.RawEntry
+		Entry *entry.RawEntry
 	}
 	Routes = F.Map[string, *Route]
 
 	impl interface {
-		Start() E.NestedError
-		Stop() E.NestedError
-		Started() bool
+		entry.Entry
+		task.TaskStarter
+		task.TaskFinisher
 		String() string
-		URL() url.URL
+		TargetURL() url.URL
 	}
 )
 
@@ -44,8 +44,8 @@ func (rt *Route) Container() *docker.Container {
 	return rt.Entry.Container
 }
 
-func NewRoute(en *types.RawEntry) (*Route, E.NestedError) {
-	entry, err := P.ValidateEntry(en)
+func NewRoute(raw *entry.RawEntry) (*Route, E.NestedError) {
+	en, err := entry.ValidateEntry(raw)
 	if err != nil {
 		return nil, err
 	}
@@ -53,11 +53,11 @@ func NewRoute(en *types.RawEntry) (*Route, E.NestedError) {
 	var t RouteType
 	var rt impl
 
-	switch e := entry.(type) {
-	case *P.StreamEntry:
+	switch e := en.(type) {
+	case *entry.StreamEntry:
 		t = RouteTypeStream
 		rt, err = NewStreamRoute(e)
-	case *P.ReverseProxyEntry:
+	case *entry.ReverseProxyEntry:
 		t = RouteTypeReverseProxy
 		rt, err = NewHTTPRoute(e)
 	default:
@@ -69,19 +69,21 @@ func NewRoute(en *types.RawEntry) (*Route, E.NestedError) {
 	return &Route{
 		impl:  rt,
 		Type:  t,
-		Entry: en,
+		Entry: raw,
 	}, nil
 }
 
-func FromEntries(entries types.RawEntries) (Routes, E.NestedError) {
+func FromEntries(entries entry.RawEntries) (Routes, E.NestedError) {
 	b := E.NewBuilder("errors in routes")
 
 	routes := NewRoutes()
-	entries.RangeAll(func(alias string, entry *types.RawEntry) {
-		entry.Alias = alias
-		r, err := NewRoute(entry)
+	entries.RangeAllParallel(func(alias string, en *entry.RawEntry) {
+		en.Alias = alias
+		r, err := NewRoute(en)
 		if err != nil {
 			b.Add(err.Subject(alias))
+		} else if entry.ShouldNotServe(r) {
+			return
 		} else {
 			routes.Store(alias, r)
 		}

internal/route/stream.go

@@ -4,169 +4,141 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"net"
+	stdNet "net"
 	"sync"
 
 	"github.com/sirupsen/logrus"
-	"github.com/yusing/go-proxy/internal/common"
+	"github.com/yusing/go-proxy/internal/docker/idlewatcher"
 	E "github.com/yusing/go-proxy/internal/error"
-	url "github.com/yusing/go-proxy/internal/net/types"
-	P "github.com/yusing/go-proxy/internal/proxy"
-	PT "github.com/yusing/go-proxy/internal/proxy/fields"
+	net "github.com/yusing/go-proxy/internal/net/types"
+	"github.com/yusing/go-proxy/internal/proxy/entry"
+	"github.com/yusing/go-proxy/internal/task"
 	F "github.com/yusing/go-proxy/internal/utils/functional"
 	"github.com/yusing/go-proxy/internal/watcher/health"
 )
 
 type StreamRoute struct {
-	*P.StreamEntry
-	StreamImpl `json:"-"`
+	*entry.StreamEntry
+	net.Stream `json:"-"`
 
 	HealthMon health.HealthMonitor `json:"health"`
 
-	url url.URL
-
-	task   common.Task
-	cancel context.CancelFunc
-	done   chan struct{}
+	task task.Task
 
 	l logrus.FieldLogger
-
-	mu sync.Mutex
 }
 
-type StreamImpl interface {
-	Setup() error
-	Accept() (any, error)
-	Handle(conn any) error
-	CloseListeners()
-	String() string
-}
-
-var streamRoutes = F.NewMapOf[string, *StreamRoute]()
+var (
+	streamRoutes   = F.NewMapOf[string, *StreamRoute]()
+	streamRoutesMu sync.Mutex
+)
 
 func GetStreamProxies() F.Map[string, *StreamRoute] {
 	return streamRoutes
 }
 
-func NewStreamRoute(entry *P.StreamEntry) (*StreamRoute, E.NestedError) {
+func NewStreamRoute(entry *entry.StreamEntry) (impl, E.NestedError) {
 	// TODO: support non-coherent scheme
 	if !entry.Scheme.IsCoherent() {
 		return nil, E.Unsupported("scheme", fmt.Sprintf("%v -> %v", entry.Scheme.ListeningScheme, entry.Scheme.ProxyScheme))
 	}
-	url, err := url.ParseURL(fmt.Sprintf("%s://%s:%d", entry.Scheme.ProxyScheme, entry.Host, entry.Port.ProxyPort))
-	if err != nil {
-		// !! should not happen
-		panic(err)
-	}
-	base := &StreamRoute{
+	return &StreamRoute{
 		StreamEntry: entry,
-		url:         url,
-	}
-	if entry.Scheme.ListeningScheme.IsTCP() {
-		base.StreamImpl = NewTCPRoute(base)
-	} else {
-		base.StreamImpl = NewUDPRoute(base)
-	}
-	base.l = logrus.WithField("route", base.StreamImpl)
-	return base, nil
+		task:        task.DummyTask(),
+	}, nil
+}
+
+func (r *StreamRoute) Finish(reason string) {
+	r.task.Finish(reason)
 }
 
 func (r *StreamRoute) String() string {
 	return fmt.Sprintf("stream %s", r.Alias)
 }
 
-func (r *StreamRoute) URL() url.URL {
-	return r.url
-}
-
-func (r *StreamRoute) Start() E.NestedError {
-	r.mu.Lock()
-	defer r.mu.Unlock()
-
-	if r.Port.ProxyPort == PT.NoPort || r.task != nil {
+// Start implements task.TaskStarter.
+func (r *StreamRoute) Start(providerSubtask task.Task) E.NestedError {
+	if entry.ShouldNotServe(r) {
+		providerSubtask.Finish("should not serve")
 		return nil
 	}
-	r.task, r.cancel = common.NewTaskWithCancel(r.String())
+
+	streamRoutesMu.Lock()
+	defer streamRoutesMu.Unlock()
+
+	if r.HealthCheck.Disabled && (entry.UseLoadBalance(r) || entry.UseIdleWatcher(r)) {
+		logrus.Warnf("%s.healthCheck.disabled cannot be false when loadbalancer or idlewatcher is enabled", r.Alias)
+		r.HealthCheck.Disabled = true
+	}
+
+	if r.Scheme.ListeningScheme.IsTCP() {
+		r.Stream = NewTCPRoute(r)
+	} else {
+		r.Stream = NewUDPRoute(r)
+	}
+	r.l = logrus.WithField("route", r.Stream.String())
+
+	switch {
+	case entry.UseIdleWatcher(r):
+		wakerTask := providerSubtask.Parent().Subtask("waker for " + string(r.Alias))
+		waker, err := idlewatcher.NewStreamWaker(wakerTask, r.StreamEntry, r.Stream)
+		if err != nil {
+			return err
+		}
+		r.Stream = waker
+		r.HealthMon = waker
+	case entry.UseHealthCheck(r):
+		r.HealthMon = health.NewRawHealthMonitor(r.TargetURL(), r.HealthCheck)
+	}
+	r.task = providerSubtask
+	r.task.OnComplete("stop stream", r.CloseListeners)
+
 	if err := r.Setup(); err != nil {
 		return E.FailWith("setup", err)
 	}
-	r.done = make(chan struct{})
 	r.l.Infof("listening on port %d", r.Port.ListeningPort)
+
 	go r.acceptConnections()
-	if !r.Healthcheck.Disabled {
-		r.HealthMon = health.NewRawHealthMonitor(r.task, r.URL(), r.Healthcheck)
-		r.HealthMon.Start()
+
+	if r.HealthMon != nil {
+		r.HealthMon.Start(r.task.Subtask("health monitor"))
 	}
 	streamRoutes.Store(string(r.Alias), r)
 	return nil
 }
 
-func (r *StreamRoute) Stop() E.NestedError {
-	r.mu.Lock()
-	defer r.mu.Unlock()
-
-	if r.task == nil {
-		return nil
-	}
-
-	streamRoutes.Delete(string(r.Alias))
-
-	if r.HealthMon != nil {
-		r.HealthMon.Stop()
-		r.HealthMon = nil
-	}
-
-	r.cancel()
-	r.CloseListeners()
-
-	<-r.done
-	return nil
-}
-
-func (r *StreamRoute) Started() bool {
-	return r.task != nil
-}
-
 func (r *StreamRoute) acceptConnections() {
-	var connWg sync.WaitGroup
-
-	task := r.task.Subtask("%s accept connections", r.String())
-
-	defer func() {
-		connWg.Wait()
-		task.Finished()
-		r.task.Finished()
-		r.task, r.cancel = nil, nil
-		close(r.done)
-		r.done = nil
-	}()
-
 	for {
 		select {
-		case <-task.Context().Done():
+		case <-r.task.Context().Done():
 			return
 		default:
 			conn, err := r.Accept()
 			if err != nil {
 				select {
-				case <-task.Context().Done():
+				case <-r.task.Context().Done():
 					return
 				default:
-					var nErr *net.OpError
+					var nErr *stdNet.OpError
 					ok := errors.As(err, &nErr)
 					if !(ok && nErr.Timeout()) {
-						r.l.Error(err)
+						r.l.Error("accept connection error: ", err)
+						r.task.Finish(err.Error())
+						return
 					}
 					continue
 				}
 			}
-			connWg.Add(1)
+			connTask := r.task.Subtask("%s connection from %s", conn.RemoteAddr().Network(), conn.RemoteAddr().String())
 			go func() {
 				err := r.Handle(conn)
 				if err != nil && !errors.Is(err, context.Canceled) {
 					r.l.Error(err)
+					connTask.Finish(err.Error())
+				} else {
+					connTask.Finish("connection closed")
 				}
-				connWg.Done()
+				conn.Close()
 			}()
 		}
 	}

internal/route/tcp.go

@@ -6,6 +6,7 @@ import (
 	"net"
 	"time"
 
+	"github.com/yusing/go-proxy/internal/net/types"
 	T "github.com/yusing/go-proxy/internal/proxy/fields"
 	U "github.com/yusing/go-proxy/internal/utils"
 	F "github.com/yusing/go-proxy/internal/utils/functional"
@@ -21,7 +22,7 @@ type (
 	}
 )
 
-func NewTCPRoute(base *StreamRoute) StreamImpl {
+func NewTCPRoute(base *StreamRoute) *TCPRoute {
 	return &TCPRoute{StreamRoute: base}
 }
 
@@ -36,19 +37,16 @@ func (route *TCPRoute) Setup() error {
 	return nil
 }
 
-func (route *TCPRoute) Accept() (any, error) {
+func (route *TCPRoute) Accept() (types.StreamConn, error) {
 	route.listener.SetDeadline(time.Now().Add(time.Second))
 	return route.listener.Accept()
 }
 
-func (route *TCPRoute) Handle(c any) error {
+func (route *TCPRoute) Handle(c types.StreamConn) error {
 	clientConn := c.(net.Conn)
 
 	defer clientConn.Close()
-	go func() {
-		<-route.task.Context().Done()
-		clientConn.Close()
-	}()
+	route.task.OnComplete("close conn", func() { clientConn.Close() })
 
 	ctx, cancel := context.WithTimeout(route.task.Context(), tcpDialTimeout)
 
@@ -70,5 +68,4 @@ func (route *TCPRoute) CloseListeners() {
 		return
 	}
 	route.listener.Close()
-	route.listener = nil
 }

internal/route/udp.go

@@ -1,11 +1,13 @@
 package route
 
 import (
+	"errors"
 	"fmt"
 	"io"
 	"net"
 	"time"
 
+	"github.com/yusing/go-proxy/internal/net/types"
 	T "github.com/yusing/go-proxy/internal/proxy/fields"
 	U "github.com/yusing/go-proxy/internal/utils"
 	F "github.com/yusing/go-proxy/internal/utils/functional"
@@ -33,7 +35,7 @@ var NewUDPConnMap = F.NewMap[UDPConnMap]
 
 const udpBufferSize = 8192
 
-func NewUDPRoute(base *StreamRoute) StreamImpl {
+func NewUDPRoute(base *StreamRoute) *UDPRoute {
 	return &UDPRoute{
 		StreamRoute: base,
 		connMap:     NewUDPConnMap(),
@@ -64,7 +66,7 @@ func (route *UDPRoute) Setup() error {
 	return nil
 }
 
-func (route *UDPRoute) Accept() (any, error) {
+func (route *UDPRoute) Accept() (types.StreamConn, error) {
 	in := route.listeningConn
 
 	buffer := make([]byte, udpBufferSize)
@@ -104,7 +106,7 @@ func (route *UDPRoute) Accept() (any, error) {
 	return conn, err
 }
 
-func (route *UDPRoute) Handle(c any) error {
+func (route *UDPRoute) Handle(c types.StreamConn) error {
 	conn := c.(*UDPConn)
 	err := conn.Start()
 	route.connMap.Delete(conn.key)
@@ -114,19 +116,25 @@ func (route *UDPRoute) Handle(c any) error {
 func (route *UDPRoute) CloseListeners() {
 	if route.listeningConn != nil {
 		route.listeningConn.Close()
-		route.listeningConn = nil
 	}
 	route.connMap.RangeAllParallel(func(_ string, conn *UDPConn) {
-		if err := conn.src.Close(); err != nil {
-			route.l.Errorf("error closing src conn: %s", err)
-		}
-		if err := conn.dst.Close(); err != nil {
-			route.l.Error("error closing dst conn: %s", err)
+		if err := conn.Close(); err != nil {
+			route.l.Errorf("error closing conn: %s", err)
 		}
 	})
 	route.connMap.Clear()
 }
 
+// Close implements types.StreamConn
+func (conn *UDPConn) Close() error {
+	return errors.Join(conn.src.Close(), conn.dst.Close())
+}
+
+// RemoteAddr implements types.StreamConn
+func (conn *UDPConn) RemoteAddr() net.Addr {
+	return conn.src.RemoteAddr()
+}
+
 type sourceRWCloser struct {
 	server *net.UDPConn
 	*net.UDPConn

internal/server/server.go

@@ -1,6 +1,7 @@
 package server
 
 import (
+	"context"
 	"crypto/tls"
 	"errors"
 	"log"
@@ -9,8 +10,7 @@ import (
 
 	"github.com/sirupsen/logrus"
 	"github.com/yusing/go-proxy/internal/autocert"
-	"github.com/yusing/go-proxy/internal/common"
-	"golang.org/x/net/context"
+	"github.com/yusing/go-proxy/internal/task"
 )
 
 type Server struct {
@@ -21,7 +21,8 @@ type Server struct {
 	httpStarted  bool
 	httpsStarted bool
 	startTime    time.Time
-	task         common.Task
+
+	task task.Task
 }
 
 type Options struct {
@@ -84,7 +85,7 @@ func NewServer(opt Options) (s *Server) {
 		CertProvider: opt.CertProvider,
 		http:         httpSer,
 		https:        httpsSer,
-		task:         common.GlobalTask(opt.Name + " server"),
+		task:         task.GlobalTask(opt.Name + " server"),
 	}
 }
 
@@ -115,11 +116,7 @@ func (s *Server) Start() {
 		}()
 	}
 
-	go func() {
-		<-s.task.Context().Done()
-		s.stop()
-		s.task.Finished()
-	}()
+	s.task.OnComplete("stop server", s.stop)
 }
 
 func (s *Server) stop() {
@@ -127,16 +124,13 @@ func (s *Server) stop() {
 		return
 	}
 
-	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
-	defer cancel()
-
 	if s.http != nil && s.httpStarted {
-		s.handleErr("http", s.http.Shutdown(ctx))
+		s.handleErr("http", s.http.Shutdown(s.task.Context()))
 		s.httpStarted = false
 	}
 
 	if s.https != nil && s.httpsStarted {
-		s.handleErr("https", s.https.Shutdown(ctx))
+		s.handleErr("https", s.https.Shutdown(s.task.Context()))
 		s.httpsStarted = false
 	}
 }
@@ -147,7 +141,7 @@ func (s *Server) Uptime() time.Duration {
 
 func (s *Server) handleErr(scheme string, err error) {
 	switch {
-	case err == nil, errors.Is(err, http.ErrServerClosed):
+	case err == nil, errors.Is(err, http.ErrServerClosed), errors.Is(err, context.Canceled):
 		return
 	default:
 		logrus.Fatalf("%s server %s error: %s", scheme, s.Name, err)

internal/task/dummy_task.go

@@ -0,0 +1,43 @@
+package task
+
+import "context"
+
+type dummyTask struct{}
+
+func DummyTask() (_ Task) {
+	return
+}
+
+// Context implements Task.
+func (d dummyTask) Context() context.Context {
+	panic("call of dummyTask.Context")
+}
+
+// Finish implements Task.
+func (d dummyTask) Finish() {}
+
+// Name implements Task.
+func (d dummyTask) Name() string {
+	return "Dummy Task"
+}
+
+// OnComplete implements Task.
+func (d dummyTask) OnComplete(about string, fn func()) {
+	panic("call of dummyTask.OnComplete")
+}
+
+// Parent implements Task.
+func (d dummyTask) Parent() Task {
+	panic("call of dummyTask.Parent")
+}
+
+// Subtask implements Task.
+func (d dummyTask) Subtask(usageFmt string, args ...any) Task {
+	panic("call of dummyTask.Subtask")
+}
+
+// Wait implements Task.
+func (d dummyTask) Wait() {}
+
+// WaitSubTasks implements Task.
+func (d dummyTask) WaitSubTasks() {}

internal/task/task.go

@@ -0,0 +1,310 @@
+package task
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"runtime"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/puzpuzpuz/xsync/v3"
+	"github.com/sirupsen/logrus"
+	"github.com/yusing/go-proxy/internal/common"
+	E "github.com/yusing/go-proxy/internal/error"
+)
+
+var globalTask = createGlobalTask()
+
+func createGlobalTask() (t *task) {
+	t = new(task)
+	t.name = "root"
+	t.ctx, t.cancel = context.WithCancelCause(context.Background())
+	t.subtasks = xsync.NewMapOf[*task, struct{}]()
+	return
+}
+
+type (
+	// Task controls objects' lifetime.
+	//
+	// Task must be initialized, use DummyTask if the task is not yet started.
+	//
+	// Objects that uses a task should implement the TaskStarter and the TaskFinisher interface.
+	//
+	// When passing a Task object to another function,
+	// it must be a sub-task of the current task,
+	// in name of "`currentTaskName`Subtask"
+	//
+	// Use Task.Finish to stop all subtasks of the task.
+	Task interface {
+		TaskFinisher
+		// Name returns the name of the task.
+		Name() string
+		// Context returns the context associated with the task. This context is
+		// canceled when Finish is called.
+		Context() context.Context
+		// FinishCause returns the reason / error that caused the task to be finished.
+		FinishCause() error
+		// Parent returns the parent task of the current task.
+		Parent() Task
+		// Subtask returns a new subtask with the given name, derived from the parent's context.
+		//
+		// If the parent's context is already canceled, the returned subtask will be canceled immediately.
+		//
+		// This should not be called after Finish, Wait, or WaitSubTasks is called.
+		Subtask(usageFmt string, args ...any) Task
+		// OnComplete calls fn when the task and all subtasks are finished.
+		//
+		// It cannot be called after Finish or Wait is called.
+		OnComplete(about string, fn func())
+		// Wait waits for all subtasks, itself and all OnComplete to finish.
+		//
+		// It must be called only after Finish is called.
+		Wait()
+		// WaitSubTasks waits for all subtasks of the task to finish.
+		//
+		// No more subtasks can be added after this call.
+		//
+		// It can be called before Finish is called.
+		WaitSubTasks()
+	}
+	TaskStarter interface {
+		// Start starts the object that implements TaskStarter,
+		// and returns an error if it fails to start.
+		//
+		// The task passed must be a subtask of the caller task.
+		//
+		// callerSubtask.Finish must be called when start fails or the object is finished.
+		Start(callerSubtask Task) E.NestedError
+	}
+	TaskFinisher interface {
+		// Finish marks the task as finished by cancelling its context.
+		//
+		// Then call Wait to wait for all subtasks and OnComplete of the task to finish.
+		//
+		// Note that it will also cancel all subtasks.
+		Finish(reason string)
+	}
+	task struct {
+		ctx    context.Context
+		cancel context.CancelCauseFunc
+
+		parent   *task
+		subtasks *xsync.MapOf[*task, struct{}]
+
+		name, line string
+
+		subTasksWg, onCompleteWg sync.WaitGroup
+	}
+)
+
+var (
+	ErrProgramExiting = errors.New("program exiting")
+	ErrTaskCancelled  = errors.New("task cancelled")
+)
+
+// GlobalTask returns a new Task with the given name, derived from the global context.
+func GlobalTask(format string, args ...any) Task {
+	return globalTask.Subtask(format, args...)
+}
+
+// DebugTaskMap returns a map[string]any representation of the global task tree.
+//
+// The returned map is suitable for encoding to JSON, and can be used
+// to debug the task tree.
+//
+// The returned map is not guaranteed to be stable, and may change
+// between runs of the program. It is intended for debugging purposes
+// only.
+func DebugTaskMap() map[string]any {
+	return globalTask.serialize()
+}
+
+// CancelGlobalContext cancels the global task context, which will cause all tasks
+// created to be canceled. This should be called before exiting the program
+// to ensure that all tasks are properly cleaned up.
+func CancelGlobalContext() {
+	globalTask.cancel(ErrProgramExiting)
+}
+
+// GlobalContextWait waits for all tasks to finish, up to the given timeout.
+//
+// If the timeout is exceeded, it prints a list of all tasks that were
+// still running when the timeout was reached, and their current tree
+// of subtasks.
+func GlobalContextWait(timeout time.Duration) {
+	done := make(chan struct{})
+	after := time.After(timeout)
+	go func() {
+		globalTask.Wait()
+		close(done)
+	}()
+	for {
+		select {
+		case <-done:
+			return
+		case <-after:
+			logrus.Warn("Timeout waiting for these tasks to finish:\n" + globalTask.tree())
+			return
+		}
+	}
+}
+
+func (t *task) Name() string {
+	return t.name
+}
+
+func (t *task) Context() context.Context {
+	return t.ctx
+}
+
+func (t *task) FinishCause() error {
+	return context.Cause(t.ctx)
+}
+
+func (t *task) Parent() Task {
+	return t.parent
+}
+
+func (t *task) OnComplete(about string, fn func()) {
+	t.onCompleteWg.Add(1)
+	var file string
+	var line int
+	if common.IsTrace {
+		_, file, line, _ = runtime.Caller(1)
+	}
+	go func() {
+		defer func() {
+			if err := recover(); err != nil {
+				logrus.Errorf("panic in task %q\nline %s:%d\n%v", t.name, file, line, err)
+			}
+		}()
+		defer t.onCompleteWg.Done()
+		t.subTasksWg.Wait()
+		<-t.ctx.Done()
+		fn()
+		logrus.Tracef("line %s:%d\ntask %q -> %q done", file, line, t.name, about)
+		t.cancel(nil) // ensure resources are released
+	}()
+}
+
+func (t *task) Finish(reason string) {
+	t.cancel(fmt.Errorf("%w: %s, reason: %s", ErrTaskCancelled, t.name, reason))
+	t.Wait()
+}
+
+func (t *task) Subtask(format string, args ...any) Task {
+	if len(args) > 0 {
+		format = fmt.Sprintf(format, args...)
+	}
+	ctx, cancel := context.WithCancelCause(t.ctx)
+	return t.newSubTask(ctx, cancel, format)
+}
+
+func (t *task) newSubTask(ctx context.Context, cancel context.CancelCauseFunc, name string) *task {
+	parent := t
+	subtask := &task{
+		ctx:      ctx,
+		cancel:   cancel,
+		name:     name,
+		parent:   parent,
+		subtasks: xsync.NewMapOf[*task, struct{}](),
+	}
+	parent.subTasksWg.Add(1)
+	parent.subtasks.Store(subtask, struct{}{})
+	if common.IsTrace {
+		_, file, line, ok := runtime.Caller(3)
+		if ok {
+			subtask.line = fmt.Sprintf("%s:%d", file, line)
+		}
+		logrus.Tracef("line %s\ntask %q started", subtask.line, name)
+		go func() {
+			subtask.Wait()
+			logrus.Tracef("task %q finished", subtask.Name())
+		}()
+	}
+	go func() {
+		subtask.Wait()
+		parent.subtasks.Delete(subtask)
+		parent.subTasksWg.Done()
+	}()
+	return subtask
+}
+
+func (t *task) Wait() {
+	t.subTasksWg.Wait()
+	if t != globalTask {
+		<-t.ctx.Done()
+	}
+	t.onCompleteWg.Wait()
+}
+
+func (t *task) WaitSubTasks() {
+	t.subTasksWg.Wait()
+}
+
+// tree returns a string representation of the task tree, with the given
+// prefix prepended to each line. The prefix is used to indent the tree,
+// and should be a string of spaces or a similar separator.
+//
+// The resulting string is suitable for printing to the console, and can be
+// used to debug the task tree.
+//
+// The tree is traversed in a depth-first manner, with each task's name and
+// line number (if available) printed on a separate line. The line number is
+// only printed if the task was created with a non-empty line argument.
+//
+// The returned string is not guaranteed to be stable, and may change between
+// runs of the program. It is intended for debugging purposes only.
+func (t *task) tree(prefix ...string) string {
+	var sb strings.Builder
+	var pre string
+	if len(prefix) > 0 {
+		pre = prefix[0]
+		sb.WriteString(pre + "- ")
+	}
+	if t.line != "" {
+		sb.WriteString("line " + t.line + "\n")
+	}
+	if len(pre) > 0 {
+		sb.WriteString(pre + "- ")
+	}
+	sb.WriteString(t.Name() + "\n")
+	t.subtasks.Range(func(subtask *task, _ struct{}) bool {
+		sb.WriteString(subtask.tree(pre + "  "))
+		return true
+	})
+	return sb.String()
+}
+
+// serialize returns a map[string]any representation of the task tree.
+//
+// The map contains the following keys:
+// - name: the name of the task
+// - line: the line number of the task, if available
+// - subtasks: a slice of maps, each representing a subtask
+//
+// The subtask maps contain the same keys, recursively.
+//
+// The returned map is suitable for encoding to JSON, and can be used
+// to debug the task tree.
+//
+// The returned map is not guaranteed to be stable, and may change
+// between runs of the program. It is intended for debugging purposes
+// only.
+func (t *task) serialize() map[string]any {
+	m := make(map[string]any)
+	m["name"] = t.name
+	if t.line != "" {
+		m["line"] = t.line
+	}
+	if t.subtasks.Size() > 0 {
+		m["subtasks"] = make([]map[string]any, 0, t.subtasks.Size())
+		t.subtasks.Range(func(subtask *task, _ struct{}) bool {
+			m["subtasks"] = append(m["subtasks"].([]map[string]any), subtask.serialize())
+			return true
+		})
+	}
+	return m
+}

internal/task/task_test.go

@@ -0,0 +1,147 @@
+package task_test
+
+import (
+	"context"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	. "github.com/yusing/go-proxy/internal/task"
+	. "github.com/yusing/go-proxy/internal/utils/testing"
+)
+
+func TestTaskCreation(t *testing.T) {
+	defer CancelGlobalContext()
+
+	rootTask := GlobalTask("root-task")
+	subTask := rootTask.Subtask("subtask")
+
+	ExpectEqual(t, "root-task", rootTask.Name())
+	ExpectEqual(t, "subtask", subTask.Name())
+}
+
+func TestTaskCancellation(t *testing.T) {
+	defer CancelGlobalContext()
+
+	subTaskDone := make(chan struct{})
+
+	rootTask := GlobalTask("root-task")
+	subTask := rootTask.Subtask("subtask")
+
+	go func() {
+		subTask.Wait()
+		close(subTaskDone)
+	}()
+
+	go rootTask.Finish("done")
+
+	select {
+	case <-subTaskDone:
+		err := subTask.Context().Err()
+		ExpectError(t, context.Canceled, err)
+		cause := context.Cause(subTask.Context())
+		ExpectError(t, ErrTaskCancelled, cause)
+	case <-time.After(1 * time.Second):
+		t.Fatal("subTask context was not canceled as expected")
+	}
+}
+
+func TestGlobalContextCancellation(t *testing.T) {
+	taskDone := make(chan struct{})
+
+	rootTask := GlobalTask("root-task")
+
+	go func() {
+		rootTask.Wait()
+		close(taskDone)
+	}()
+
+	CancelGlobalContext()
+
+	select {
+	case <-taskDone:
+		err := rootTask.Context().Err()
+		ExpectError(t, context.Canceled, err)
+		cause := context.Cause(rootTask.Context())
+		ExpectError(t, ErrProgramExiting, cause)
+	case <-time.After(1 * time.Second):
+		t.Fatal("subTask context was not canceled as expected")
+	}
+}
+
+func TestOnComplete(t *testing.T) {
+	defer CancelGlobalContext()
+
+	task := GlobalTask("test")
+	var value atomic.Int32
+	task.OnComplete("set value", func() {
+		value.Store(1234)
+	})
+	task.Finish("done")
+	ExpectEqual(t, value.Load(), 1234)
+}
+
+func TestGlobalContextWait(t *testing.T) {
+	defer CancelGlobalContext()
+
+	rootTask := GlobalTask("root-task")
+
+	finished1, finished2 := false, false
+
+	subTask1 := rootTask.Subtask("subtask1")
+	subTask2 := rootTask.Subtask("subtask2")
+	subTask1.OnComplete("set finished", func() {
+		finished1 = true
+	})
+	subTask2.OnComplete("set finished", func() {
+		finished2 = true
+	})
+
+	go func() {
+		time.Sleep(500 * time.Millisecond)
+		subTask1.Finish("done")
+	}()
+
+	go func() {
+		time.Sleep(500 * time.Millisecond)
+		subTask2.Finish("done")
+	}()
+
+	go func() {
+		subTask1.Wait()
+		subTask2.Wait()
+		rootTask.Finish("done")
+	}()
+
+	GlobalContextWait(1 * time.Second)
+	ExpectTrue(t, finished1)
+	ExpectTrue(t, finished2)
+	ExpectError(t, context.Canceled, rootTask.Context().Err())
+	ExpectError(t, ErrTaskCancelled, context.Cause(subTask1.Context()))
+	ExpectError(t, ErrTaskCancelled, context.Cause(subTask2.Context()))
+}
+
+func TestTimeoutOnGlobalContextWait(t *testing.T) {
+	defer CancelGlobalContext()
+
+	rootTask := GlobalTask("root-task")
+	subTask := rootTask.Subtask("subtask")
+
+	done := make(chan struct{})
+	go func() {
+		GlobalContextWait(500 * time.Millisecond)
+		close(done)
+	}()
+
+	select {
+	case <-done:
+		t.Fatal("GlobalContextWait should have timed out")
+	case <-time.After(200 * time.Millisecond):
+	}
+
+	// Ensure clean exit
+	subTask.Finish("exit")
+}
+
+func TestGlobalContextCancel(t *testing.T) {
+}

internal/types/config.go

@@ -1,18 +0,0 @@
-package types
-
-type Config struct {
-	Providers       ProxyProviders `json:"providers" yaml:",flow"`
-	AutoCert        AutoCertConfig `json:"autocert" yaml:",flow"`
-	ExplicitOnly    bool           `json:"explicit_only" yaml:"explicit_only"`
-	MatchDomains    []string       `json:"match_domains" yaml:"match_domains"`
-	TimeoutShutdown int            `json:"timeout_shutdown" yaml:"timeout_shutdown"`
-	RedirectToHTTPS bool           `json:"redirect_to_https" yaml:"redirect_to_https"`
-}
-
-func DefaultConfig() *Config {
-	return &Config{
-		Providers:       ProxyProviders{},
-		TimeoutShutdown: 3,
-		RedirectToHTTPS: false,
-	}
-}

internal/types/proxy_providers.go

@@ -1,6 +0,0 @@
-package types
-
-type ProxyProviders struct {
-	Files  []string          `json:"include" yaml:"include"` // docker, file
-	Docker map[string]string `json:"docker" yaml:"docker"`
-}

internal/utils/testing/testing.go

@@ -23,7 +23,7 @@ func IgnoreError[Result any](r Result, _ error) Result {
 func ExpectNoError(t *testing.T, err error) {
 	t.Helper()
 	if err != nil && !reflect.ValueOf(err).IsNil() {
-		t.Errorf("expected err=nil, got %s", err.Error())
+		t.Errorf("expected err=nil, got %s", err)
 		t.FailNow()
 	}
 }
@@ -31,7 +31,7 @@ func ExpectNoError(t *testing.T, err error) {
 func ExpectError(t *testing.T, expected error, err error) {
 	t.Helper()
 	if !errors.Is(err, expected) {
-		t.Errorf("expected err %s, got %s", expected.Error(), err.Error())
+		t.Errorf("expected err %s, got %s", expected, err)
 		t.FailNow()
 	}
 }
@@ -39,7 +39,7 @@ func ExpectError(t *testing.T, expected error, err error) {
 func ExpectError2(t *testing.T, input any, expected error, err error) {
 	t.Helper()
 	if !errors.Is(err, expected) {
-		t.Errorf("%v: expected err %s, got %s", input, expected.Error(), err.Error())
+		t.Errorf("%v: expected err %s, got %s", input, expected, err)
 		t.FailNow()
 	}
 }

internal/watcher/docker_watcher.go

@@ -15,8 +15,9 @@ import (
 
 type (
 	DockerWatcher struct {
-		host   string
-		client D.Client
+		host        string
+		client      D.Client
+		clientOwned bool
 		logrus.FieldLogger
 	}
 	DockerListOptions = docker_events.ListOptions
@@ -44,10 +45,11 @@ func DockerrFilterContainer(nameOrID string) filters.KeyValuePair {
 
 func NewDockerWatcher(host string) DockerWatcher {
 	return DockerWatcher{
+		host:        host,
+		clientOwned: true,
 		FieldLogger: (logrus.
 			WithField("module", "docker_watcher").
 			WithField("host", host)),
-		host: host,
 	}
 }
 
@@ -72,7 +74,7 @@ func (w DockerWatcher) EventsWithOptions(ctx context.Context, options DockerList
 		defer close(errCh)
 
 		defer func() {
-			if w.client.Connected() {
+			if w.clientOwned && w.client.Connected() {
 				w.client.Close()
 			}
 		}()

internal/watcher/events/event_queue.go

@@ -0,0 +1,91 @@
+package events
+
+import (
+	"time"
+
+	E "github.com/yusing/go-proxy/internal/error"
+	"github.com/yusing/go-proxy/internal/task"
+)
+
+type (
+	EventQueue struct {
+		task    task.Task
+		queue   []Event
+		ticker  *time.Ticker
+		onFlush OnFlushFunc
+		onError OnErrorFunc
+	}
+	OnFlushFunc = func(flushTask task.Task, events []Event)
+	OnErrorFunc = func(err E.NestedError)
+)
+
+const eventQueueCapacity = 10
+
+// NewEventQueue returns a new EventQueue with the given
+// queueTask, flushInterval, onFlush and onError.
+//
+// The returned EventQueue will start a goroutine to flush events in the queue
+// when the flushInterval is reached.
+//
+// The onFlush function is called when the flushInterval is reached and the queue is not empty,
+//
+// The onError function is called when an error received from the errCh,
+// or panic occurs in the onFlush function. Panic will cause a E.ErrPanicRecv error.
+//
+// flushTask.Finish must be called after the flush is done,
+// but the onFlush function can return earlier (e.g. run in another goroutine).
+//
+// If task is cancelled before the flushInterval is reached, the events in queue will be discarded.
+func NewEventQueue(parent task.Task, flushInterval time.Duration, onFlush OnFlushFunc, onError OnErrorFunc) *EventQueue {
+	return &EventQueue{
+		task:    parent.Subtask("event queue"),
+		queue:   make([]Event, 0, eventQueueCapacity),
+		ticker:  time.NewTicker(flushInterval),
+		onFlush: onFlush,
+		onError: onError,
+	}
+}
+
+func (e *EventQueue) Start(eventCh <-chan Event, errCh <-chan E.NestedError) {
+	go func() {
+		defer e.ticker.Stop()
+		for {
+			select {
+			case <-e.task.Context().Done():
+				e.task.Finish(e.task.FinishCause().Error())
+				return
+			case <-e.ticker.C:
+				if len(e.queue) > 0 {
+					flushTask := e.task.Subtask("flush events")
+					queue := e.queue
+					e.queue = make([]Event, 0, eventQueueCapacity)
+					go func() {
+						defer func() {
+							if err := recover(); err != nil {
+								e.onError(E.PanicRecv("panic in onFlush %s", err))
+							}
+						}()
+						e.onFlush(flushTask, queue)
+					}()
+					flushTask.Wait()
+				}
+			case event, ok := <-eventCh:
+				e.queue = append(e.queue, event)
+				if !ok {
+					return
+				}
+			case err := <-errCh:
+				if err != nil {
+					e.onError(err)
+				}
+			}
+		}
+	}()
+}
+
+// Wait waits for all events to be flushed and the task to finish.
+//
+// It is safe to call this method multiple times.
+func (e *EventQueue) Wait() {
+	e.task.Wait()
+}

internal/watcher/events/events.go

@@ -74,7 +74,7 @@ var actionNameMap = func() (m map[Action]string) {
 }()
 
 func (e Event) String() string {
-	return fmt.Sprintf("%s %s", e.ActorName, e.Action)
+	return fmt.Sprintf("%s %s", e.Action, e.ActorName)
 }
 
 func (a Action) String() string {

internal/watcher/health/http.go

@@ -5,7 +5,6 @@ import (
 	"errors"
 	"net/http"
 
-	"github.com/yusing/go-proxy/internal/common"
 	"github.com/yusing/go-proxy/internal/net/types"
 )
 
@@ -15,10 +14,10 @@ type HTTPHealthMonitor struct {
 	pinger *http.Client
 }
 
-func NewHTTPHealthMonitor(task common.Task, url types.URL, config *HealthCheckConfig) HealthMonitor {
+func NewHTTPHealthMonitor(url types.URL, config *HealthCheckConfig, transport http.RoundTripper) *HTTPHealthMonitor {
 	mon := new(HTTPHealthMonitor)
-	mon.monitor = newMonitor(task, url, config, mon.checkHealth)
-	mon.pinger = &http.Client{Timeout: config.Timeout}
+	mon.monitor = newMonitor(url, config, mon.CheckHealth)
+	mon.pinger = &http.Client{Timeout: config.Timeout, Transport: transport}
 	if config.UseGet {
 		mon.method = http.MethodGet
 	} else {
@@ -27,19 +26,26 @@ func NewHTTPHealthMonitor(task common.Task, url types.URL, config *HealthCheckCo
 	return mon
 }
 
-func (mon *HTTPHealthMonitor) checkHealth() (healthy bool, detail string, err error) {
+func NewHTTPHealthChecker(url types.URL, config *HealthCheckConfig, transport http.RoundTripper) HealthChecker {
+	return NewHTTPHealthMonitor(url, config, transport)
+}
+
+func (mon *HTTPHealthMonitor) CheckHealth() (healthy bool, detail string, err error) {
+	ctx, cancel := mon.ContextWithTimeout("ping request timed out")
+	defer cancel()
+
 	req, reqErr := http.NewRequestWithContext(
-		mon.task.Context(),
+		ctx,
 		mon.method,
-		mon.url.JoinPath(mon.config.Path).String(),
+		mon.url.Load().JoinPath(mon.config.Path).String(),
 		nil,
 	)
 	if reqErr != nil {
 		err = reqErr
 		return
 	}
-	req.Header.Set("Connection", "close")
 
+	req.Header.Set("Connection", "close")
 	resp, respErr := mon.pinger.Do(req)
 	if respErr == nil {
 		resp.Body.Close()

internal/watcher/health/monitor.go

@@ -2,78 +2,93 @@ package health
 
 import (
 	"context"
+	"encoding/json"
 	"errors"
-	"sync"
+	"fmt"
 	"time"
 
-	"github.com/yusing/go-proxy/internal/common"
+	E "github.com/yusing/go-proxy/internal/error"
 	"github.com/yusing/go-proxy/internal/net/types"
+	"github.com/yusing/go-proxy/internal/task"
 	U "github.com/yusing/go-proxy/internal/utils"
 	F "github.com/yusing/go-proxy/internal/utils/functional"
 )
 
 type (
 	HealthMonitor interface {
-		Start()
-		Stop()
+		task.TaskStarter
+		task.TaskFinisher
+		fmt.Stringer
+		json.Marshaler
 		Status() Status
 		Uptime() time.Duration
 		Name() string
-		String() string
-		MarshalJSON() ([]byte, error)
+	}
+	HealthChecker interface {
+		CheckHealth() (healthy bool, detail string, err error)
+		URL() types.URL
+		Config() *HealthCheckConfig
+		UpdateURL(url types.URL)
 	}
 	HealthCheckFunc func() (healthy bool, detail string, err error)
 	monitor         struct {
 		service string
 		config  *HealthCheckConfig
-		url     types.URL
+		url     U.AtomicValue[types.URL]
 
 		status      U.AtomicValue[Status]
 		checkHealth HealthCheckFunc
 		startTime   time.Time
 
-		task   common.Task
-		cancel context.CancelFunc
-		done   chan struct{}
-
-		mu sync.Mutex
+		task task.Task
 	}
 )
 
 var monMap = F.NewMapOf[string, HealthMonitor]()
 
-func newMonitor(task common.Task, url types.URL, config *HealthCheckConfig, healthCheckFunc HealthCheckFunc) *monitor {
-	service := task.Name()
-	task, cancel := task.SubtaskWithCancel("Health monitor for %s", service)
+func newMonitor(url types.URL, config *HealthCheckConfig, healthCheckFunc HealthCheckFunc) *monitor {
 	mon := &monitor{
-		service:     service,
 		config:      config,
-		url:         url,
 		checkHealth: healthCheckFunc,
 		startTime:   time.Now(),
-		task:        task,
-		cancel:      cancel,
-		done:        make(chan struct{}),
+		task:        task.DummyTask(),
 	}
+	mon.url.Store(url)
 	mon.status.Store(StatusHealthy)
 	return mon
 }
 
-func Inspect(name string) (HealthMonitor, bool) {
-	return monMap.Load(name)
+func Inspect(service string) (HealthMonitor, bool) {
+	return monMap.Load(service)
 }
 
-func (mon *monitor) Start() {
-	defer monMap.Store(mon.task.Name(), mon)
+func (mon *monitor) ContextWithTimeout(cause string) (ctx context.Context, cancel context.CancelFunc) {
+	if mon.task != nil {
+		return context.WithTimeoutCause(mon.task.Context(), mon.config.Timeout, errors.New(cause))
+	} else {
+		return context.WithTimeoutCause(context.Background(), mon.config.Timeout, errors.New(cause))
+	}
+}
 
+// Start implements task.TaskStarter.
+func (mon *monitor) Start(routeSubtask task.Task) E.NestedError {
+	mon.service = routeSubtask.Parent().Name()
+	mon.task = routeSubtask
+
+	if err := mon.checkUpdateHealth(); err != nil {
+		mon.task.Finish(fmt.Sprintf("healthchecker %s failure: %s", mon.service, err))
+		return err
+	}
 	go func() {
-		defer close(mon.done)
-		defer mon.task.Finished()
+		defer func() {
+			monMap.Delete(mon.task.Name())
+			if mon.status.Load() != StatusError {
+				mon.status.Store(StatusUnknown)
+			}
+			mon.task.Finish(mon.task.FinishCause().Error())
+		}()
 
-		ok := mon.checkUpdateHealth()
-		if !ok {
-			return
-		}
+		monMap.Store(mon.service, mon)
 
 		ticker := time.NewTicker(mon.config.Interval)
 		defer ticker.Stop()
@@ -83,48 +98,61 @@ func (mon *monitor) Start() {
 			case <-mon.task.Context().Done():
 				return
 			case <-ticker.C:
-				ok = mon.checkUpdateHealth()
-				if !ok {
+				err := mon.checkUpdateHealth()
+				if err != nil {
+					logger.Errorf("healthchecker %s failure: %s", mon.service, err)
 					return
 				}
 			}
 		}
 	}()
+	return nil
 }
 
-func (mon *monitor) Stop() {
-	monMap.Delete(mon.task.Name())
-
-	mon.mu.Lock()
-	defer mon.mu.Unlock()
-
-	if mon.cancel == nil {
-		return
-	}
-
-	mon.cancel()
-	<-mon.done
-
-	mon.cancel = nil
-	mon.status.Store(StatusUnknown)
+// Finish implements task.TaskFinisher.
+func (mon *monitor) Finish(reason string) {
+	mon.task.Finish(reason)
 }
 
+// UpdateURL implements HealthChecker.
+func (mon *monitor) UpdateURL(url types.URL) {
+	mon.url.Store(url)
+}
+
+// URL implements HealthChecker.
+func (mon *monitor) URL() types.URL {
+	return mon.url.Load()
+}
+
+// Config implements HealthChecker.
+func (mon *monitor) Config() *HealthCheckConfig {
+	return mon.config
+}
+
+// Status implements HealthMonitor.
 func (mon *monitor) Status() Status {
 	return mon.status.Load()
 }
 
+// Uptime implements HealthMonitor.
 func (mon *monitor) Uptime() time.Duration {
 	return time.Since(mon.startTime)
 }
 
+// Name implements HealthMonitor.
 func (mon *monitor) Name() string {
+	if mon.task == nil {
+		return ""
+	}
 	return mon.task.Name()
 }
 
+// String implements fmt.Stringer of HealthMonitor.
 func (mon *monitor) String() string {
 	return mon.Name()
 }
 
+// MarshalJSON implements json.Marshaler of HealthMonitor.
 func (mon *monitor) MarshalJSON() ([]byte, error) {
 	return (&JSONRepresentation{
 		Name:    mon.service,
@@ -132,19 +160,19 @@ func (mon *monitor) MarshalJSON() ([]byte, error) {
 		Status:  mon.status.Load(),
 		Started: mon.startTime,
 		Uptime:  mon.Uptime(),
-		URL:     mon.url,
+		URL:     mon.url.Load(),
 	}).MarshalJSON()
 }
 
-func (mon *monitor) checkUpdateHealth() (hasError bool) {
+func (mon *monitor) checkUpdateHealth() E.NestedError {
 	healthy, detail, err := mon.checkHealth()
 	if err != nil {
+		defer mon.task.Finish(err.Error())
 		mon.status.Store(StatusError)
 		if !errors.Is(err, context.Canceled) {
-			logger.Errorf("%s failed to check health: %s", mon.service, err)
+			return E.Failure("check health").With(err)
 		}
-		mon.Stop()
-		return false
+		return nil
 	}
 	var status Status
 	if healthy {
@@ -160,5 +188,5 @@ func (mon *monitor) checkUpdateHealth() (hasError bool) {
 		}
 	}
 
-	return true
+	return nil
 }

internal/watcher/health/raw.go

@@ -3,7 +3,6 @@ package health
 import (
 	"net"
 
-	"github.com/yusing/go-proxy/internal/common"
 	"github.com/yusing/go-proxy/internal/net/types"
 )
 
@@ -14,9 +13,9 @@ type (
 	}
 )
 
-func NewRawHealthMonitor(task common.Task, url types.URL, config *HealthCheckConfig) HealthMonitor {
+func NewRawHealthMonitor(url types.URL, config *HealthCheckConfig) *RawHealthMonitor {
 	mon := new(RawHealthMonitor)
-	mon.monitor = newMonitor(task, url, config, mon.checkAvail)
+	mon.monitor = newMonitor(url, config, mon.CheckHealth)
 	mon.dialer = &net.Dialer{
 		Timeout:       config.Timeout,
 		FallbackDelay: -1,
@@ -24,14 +23,22 @@ func NewRawHealthMonitor(task common.Task, url types.URL, config *HealthCheckCon
 	return mon
 }
 
-func (mon *RawHealthMonitor) checkAvail() (avail bool, detail string, err error) {
-	conn, dialErr := mon.dialer.DialContext(mon.task.Context(), mon.url.Scheme, mon.url.Host)
+func NewRawHealthChecker(url types.URL, config *HealthCheckConfig) HealthChecker {
+	return NewRawHealthMonitor(url, config)
+}
+
+func (mon *RawHealthMonitor) CheckHealth() (healthy bool, detail string, err error) {
+	ctx, cancel := mon.ContextWithTimeout("ping request timed out")
+	defer cancel()
+
+	url := mon.url.Load()
+	conn, dialErr := mon.dialer.DialContext(ctx, url.Scheme, url.Host)
 	if dialErr != nil {
 		detail = dialErr.Error()
 		/* trunk-ignore(golangci-lint/nilerr) */
 		return
 	}
 	conn.Close()
-	avail = true
+	healthy = true
 	return
 }