fixed / suppressed (irrelevant) golangci-lint errors

Dockerfile

@@ -1,5 +1,9 @@
 # Stage 1: Builder
 FROM golang:1.23.3-alpine AS builder
+HEALTHCHECK NONE
+
+# package version does not matter
+# trunk-ignore(hadolint/DL3018)
 RUN apk add --no-cache tzdata make
 
 WORKDIR /src

cmd/main.go

@@ -160,7 +160,7 @@ func main() {
 	// grafully shutdown
 	logging.Info().Msg("shutting down")
 	task.CancelGlobalContext()
-	task.GlobalContextWait(time.Second * time.Duration(config.Value().TimeoutShutdown))
+	_ = task.GlobalContextWait(time.Second * time.Duration(config.Value().TimeoutShutdown))
 }
 
 func prepareDirectory(dir string) {

internal/docker/idlewatcher/watcher.go

@@ -44,6 +44,8 @@ var (
 	watcherMap   = F.NewMapOf[string, *Watcher]()
 	watcherMapMu sync.Mutex
 
+	errShouldNotReachHere = errors.New("should not reach here")
+
 	logger = logging.With().Str("module", "idle_watcher").Logger()
 )
 
@@ -53,7 +55,7 @@ func registerWatcher(providerSubtask task.Task, entry route.Entry, waker *waker)
 	cfg := entry.IdlewatcherConfig()
 
 	if cfg.IdleTimeout == 0 {
-		panic("should not reach here")
+		panic(errShouldNotReachHere)
 	}
 
 	watcherMapMu.Lock()
@@ -104,10 +106,12 @@ func (w *Watcher) Wake() error {
 
 // WakeDebug logs a debug message related to waking the container.
 func (w *Watcher) WakeDebug() *zerolog.Event {
+	//nolint:zerologlint
 	return w.Debug().Str("action", "wake")
 }
 
 func (w *Watcher) WakeTrace() *zerolog.Event {
+	//nolint:zerologlint
 	return w.Trace().Str("action", "wake")
 }
 
@@ -177,7 +181,7 @@ func (w *Watcher) wakeIfStopped() error {
 	case "running":
 		return nil
 	default:
-		panic("should not reach here")
+		panic(errShouldNotReachHere)
 	}
 }
 
@@ -191,7 +195,7 @@ func (w *Watcher) getStopCallback() StopCallback {
 	case idlewatcher.StopMethodKill:
 		cb = w.containerKill
 	default:
-		panic("should not reach here")
+		panic(errShouldNotReachHere)
 	}
 	return func() error {
 		ctx, cancel := context.WithTimeout(w.task.Context(), time.Duration(w.StopTimeout)*time.Second)

internal/error/base.go

@@ -1,4 +1,4 @@
-package error
+package err
 
 import (
 	"errors"
@@ -6,6 +6,8 @@ import (
 )
 
 // baseError is an immutable wrapper around an error.
+//
+//nolint:recvcheck
 type baseError struct {
 	Err error `json:"err"`
 }

internal/error/builder.go

@@ -1,4 +1,4 @@
-package error
+package err
 
 import (
 	"fmt"
@@ -60,7 +60,7 @@ func (b *Builder) Add(err error) *Builder {
 	b.Lock()
 	defer b.Unlock()
 
-	switch err := err.(type) {
+	switch err := From(err).(type) {
 	case *baseError:
 		b.errs = append(b.errs, err.Err)
 	case *nestedError:
@@ -70,7 +70,7 @@ func (b *Builder) Add(err error) *Builder {
 			b.errs = append(b.errs, err)
 		}
 	default:
-		b.errs = append(b.errs, err)
+		panic("bug: should not reach here")
 	}
 
 	return b

internal/error/builder_test.go

@@ -1,4 +1,4 @@
-package error_test
+package err_test
 
 import (
 	"context"

internal/error/error.go

@@ -1,4 +1,4 @@
-package error
+package err
 
 type Error interface {
 	error
@@ -24,6 +24,8 @@ type Error interface {
 
 // this makes JSON marshaling work,
 // as the builtin one doesn't.
+//
+//nolint:errname
 type errStr string
 
 func (err errStr) Error() string {

internal/error/error_test.go

@@ -1,4 +1,4 @@
-package error
+package err
 
 import (
 	"errors"
@@ -81,10 +81,10 @@ func TestErrorImmutability(t *testing.T) {
 
 	for range 3 {
 		// t.Logf("%d: %v %T %s", i, errors.Unwrap(err), err, err)
-		err.Subject("foo")
+		_ = err.Subject("foo")
 		ExpectFalse(t, strings.Contains(err.Error(), "foo"))
 
-		err.With(err2)
+		_ = err.With(err2)
 		ExpectFalse(t, strings.Contains(err.Error(), "extra"))
 		ExpectFalse(t, err.Is(err2))
 
@@ -102,7 +102,7 @@ func TestErrorWith(t *testing.T) {
 	ExpectTrue(t, err3.Is(err1))
 	ExpectTrue(t, err3.Is(err2))
 
-	err2.Subject("foo")
+	_ = err2.Subject("foo")
 
 	ExpectTrue(t, err3.Is(err1))
 	ExpectTrue(t, err3.Is(err2))

internal/error/log.go

@@ -1,4 +1,4 @@
-package error
+package err
 
 import (
 	"github.com/rs/zerolog"

internal/error/nested_error.go

@@ -1,4 +1,4 @@
-package error
+package err
 
 import (
 	"errors"
@@ -6,6 +6,7 @@ import (
 	"strings"
 )
 
+//nolint:recvcheck
 type nestedError struct {
 	Err    error   `json:"err"`
 	Extras []error `json:"extras"`
@@ -66,7 +67,18 @@ func (err *nestedError) Is(other error) bool {
 }
 
 func (err *nestedError) Error() string {
-	return buildError(err, 0)
+	if err == nil {
+		return makeLine("<nil>", 0)
+	}
+
+	lines := make([]string, 0, 1+len(err.Extras))
+	if err.Err != nil {
+		lines = append(lines, makeLine(err.Err.Error(), 0))
+	}
+	if extras := makeLines(err.Extras, 1); len(extras) > 0 {
+		lines = append(lines, extras...)
+	}
+	return strings.Join(lines, "\n")
 }
 
 //go:inline
@@ -86,7 +98,7 @@ func makeLines(errs []error, level int) []string {
 	}
 	lines := make([]string, 0, len(errs))
 	for _, err := range errs {
-		switch err := err.(type) {
+		switch err := From(err).(type) {
 		case *nestedError:
 			if err.Err != nil {
 				lines = append(lines, makeLine(err.Err.Error(), level))
@@ -100,21 +112,3 @@ func makeLines(errs []error, level int) []string {
 	}
 	return lines
 }
-
-func buildError(err error, level int) string {
-	switch err := err.(type) {
-	case nil:
-		return makeLine("<nil>", level)
-	case *nestedError:
-		lines := make([]string, 0, 1+len(err.Extras))
-		if err.Err != nil {
-			lines = append(lines, makeLine(err.Err.Error(), level))
-		}
-		if extras := makeLines(err.Extras, level+1); len(extras) > 0 {
-			lines = append(lines, extras...)
-		}
-		return strings.Join(lines, "\n")
-	default:
-		return makeLine(err.Error(), level)
-	}
-}

internal/error/subject.go

@@ -1,4 +1,4 @@
-package error
+package err
 
 import (
 	"strings"
@@ -6,6 +6,7 @@ import (
 	"github.com/yusing/go-proxy/internal/utils/strutils/ansi"
 )
 
+//nolint:errname
 type withSubject struct {
 	Subject string `json:"subject"`
 	Err     error  `json:"err"`
@@ -18,23 +19,26 @@ func highlight(subject string) string {
 }
 
 func PrependSubject(subject string, err error) error {
-	switch err := err.(type) {
-	case nil:
+	if err == nil {
 		return nil
+	}
+
+	//nolint:errorlint
+	switch err := err.(type) {
 	case *withSubject:
 		return err.Prepend(subject)
 	case Error:
 		return err.Subject(subject)
-	default:
-		return &withSubject{subject, err}
 	}
+	return &withSubject{subject, err}
 }
 
-func (err withSubject) Prepend(subject string) *withSubject {
+func (err *withSubject) Prepend(subject string) *withSubject {
+	clone := *err
 	if subject != "" {
-		err.Subject = subject + subjectSep + err.Subject
+		clone.Subject = subject + subjectSep + clone.Subject
 	}
-	return &err
+	return &clone
 }
 
 func (err *withSubject) Is(other error) bool {

internal/error/utils.go

@@ -1,6 +1,7 @@
-package error
+package err
 
 import (
+	"errors"
 	"fmt"
 )
 
@@ -19,12 +20,12 @@ func Errorf(format string, args ...any) Error {
 	return &baseError{fmt.Errorf(format, args...)}
 }
 
-func From(err error) Error {
+func From(err error) (e Error) {
 	if err == nil {
 		return nil
 	}
-	if err, ok := err.(Error); ok {
-		return err
+	if errors.As(err, &e) {
+		return e
 	}
 	return &baseError{err}
 }

internal/homepage/homepage.go

@@ -1,6 +1,7 @@
 package homepage
 
 type (
+	//nolint:recvcheck
 	Config   map[string]Category
 	Category []*Item
 

internal/logging/logging.go

@@ -1,3 +1,4 @@
+//nolint:zerologlint
 package logging
 
 import (

internal/net/http/middleware/real_ip.go

@@ -81,8 +81,8 @@ func (ri *realIP) setRealIP(req *http.Request) {
 		return
 	}
 
-	var realIPs = req.Header.Values(ri.Header)
-	var lastNonTrustedIP string
+	realIPs := req.Header.Values(ri.Header)
+	lastNonTrustedIP := ""
 
 	if len(realIPs) == 0 {
 		ri.AddTracef("no real ip found in header %s", ri.Header).WithRequest(req)

internal/notif/providers.go

@@ -45,10 +45,14 @@ func newNotifProvider[T Provider](cfg map[string]any) (Provider, E.Error) {
 	return client, nil
 }
 
+func formatError(p Provider, err error) error {
+	return fmt.Errorf("%s error: %w", p.Name(), err)
+}
+
 func notifyProvider(ctx context.Context, provider Provider, msg *LogMessage) error {
 	body, err := provider.MakeBody(msg)
 	if err != nil {
-		return fmt.Errorf("%s error: %w", provider.Name(), err)
+		return formatError(provider, err)
 	}
 	req, err := http.NewRequestWithContext(
 		ctx,
@@ -57,7 +61,7 @@ func notifyProvider(ctx context.Context, provider Provider, msg *LogMessage) err
 		body,
 	)
 	if err != nil {
-		return fmt.Errorf("%s error: %w", provider.Name(), err)
+		return formatError(provider, err)
 	}
 
 	req.Header.Set("Content-Type", provider.MIMEType())
@@ -67,7 +71,7 @@ func notifyProvider(ctx context.Context, provider Provider, msg *LogMessage) err
 
 	resp, err := http.DefaultClient.Do(req)
 	if err != nil {
-		return fmt.Errorf("%s error: %w", provider.Name(), err)
+		return formatError(provider, err)
 	}
 
 	defer resp.Body.Close()

internal/route/http.go

@@ -174,7 +174,9 @@ func (r *HTTPRoute) addToLoadBalancer() {
 		lbTask.OnCancel("remove lb from routes", func() {
 			routes.DeleteHTTPRoute(r.LoadBalance.Link)
 		})
-		lb.Start(lbTask)
+		if err := lb.Start(lbTask); err != nil {
+			panic(err) // should always return nil
+		}
 		linked = &HTTPRoute{
 			ReverseProxyEntry: &entry.ReverseProxyEntry{
 				Raw: &route.RawEntry{

internal/route/types/raw_entry.go

@@ -1,3 +1,4 @@
+//nolint:goconst
 package types
 
 import (

internal/route/udp_forwarder.go

@@ -96,16 +96,16 @@ func (w *UDPForwarder) readFromListener(buf *UDPBuf) (srcAddr *net.UDPAddr, err
 	return
 }
 
-func (dst *UDPConn) read() (err error) {
-	switch dstConn := dst.conn.(type) {
+func (conn *UDPConn) read() (err error) {
+	switch dstConn := conn.conn.(type) {
 	case *net.UDPConn:
-		dst.buf.n, dst.buf.oobn, _, _, err = dstConn.ReadMsgUDP(dst.buf.data, dst.buf.oob)
+		conn.buf.n, conn.buf.oobn, _, _, err = dstConn.ReadMsgUDP(conn.buf.data, conn.buf.oob)
 	default:
-		dst.buf.n, err = dstConn.Read(dst.buf.data[:dst.buf.n])
-		dst.buf.oobn = 0
+		conn.buf.n, err = dstConn.Read(conn.buf.data[:conn.buf.n])
+		conn.buf.oobn = 0
 	}
 	if err == nil {
-		logger.Debug().Msgf("read from dst %s success (n: %d, oobn: %d)", dst.DstAddrString(), dst.buf.n, dst.buf.oobn)
+		logger.Debug().Msgf("read from dst %s success (n: %d, oobn: %d)", conn.DstAddrString(), conn.buf.n, conn.buf.oobn)
 	}
 	return
 }
@@ -118,17 +118,17 @@ func (w *UDPForwarder) writeToSrc(srcAddr *net.UDPAddr, buf *UDPBuf) (err error)
 	return
 }
 
-func (dst *UDPConn) write() (err error) {
-	switch dstConn := dst.conn.(type) {
+func (conn *UDPConn) write() (err error) {
+	switch dstConn := conn.conn.(type) {
 	case *net.UDPConn:
-		dst.buf.n, dst.buf.oobn, err = dstConn.WriteMsgUDP(dst.buf.data[:dst.buf.n], dst.buf.oob[:dst.buf.oobn], nil)
+		conn.buf.n, conn.buf.oobn, err = dstConn.WriteMsgUDP(conn.buf.data[:conn.buf.n], conn.buf.oob[:conn.buf.oobn], nil)
 		if err == nil {
-			logger.Debug().Msgf("write to dst %s success (n: %d, oobn: %d)", dst.DstAddrString(), dst.buf.n, dst.buf.oobn)
+			logger.Debug().Msgf("write to dst %s success (n: %d, oobn: %d)", conn.DstAddrString(), conn.buf.n, conn.buf.oobn)
 		}
 	default:
-		_, err = dstConn.Write(dst.buf.data[:dst.buf.n])
+		_, err = dstConn.Write(conn.buf.data[:conn.buf.n])
 		if err == nil {
-			logger.Debug().Msgf("write to dst %s success (n: %d)", dst.DstAddrString(), dst.buf.n)
+			logger.Debug().Msgf("write to dst %s success (n: %d)", conn.DstAddrString(), conn.buf.n)
 		}
 	}
 

internal/utils/serialization.go

@@ -149,7 +149,7 @@ func extractFields(t reflect.Type) []reflect.StructField {
 		return nil
 	}
 	var fields []reflect.StructField
-	for i := 0; i < t.NumField(); i++ {
+	for i := range t.NumField() {
 		field := t.Field(i)
 		if !field.IsExported() {
 			continue

internal/utils/strutils/string.go

@@ -32,6 +32,7 @@ func ToLowerNoSnake(s string) string {
 	return strings.ToLower(strings.ReplaceAll(s, "_", ""))
 }
 
+//nolint:intrange
 func LevenshteinDistance(a, b string) int {
 	if a == b {
 		return 0

internal/watcher/health/monitor/raw.go

@@ -41,7 +41,6 @@ func (mon *RawHealthMonitor) CheckHealth() (result *health.HealthCheckResult, er
 	}
 	if dialErr != nil {
 		result.Detail = dialErr.Error()
-		/* trunk-ignore(golangci-lint/nilerr) */
 		return
 	}
 	conn.Close()