feat(agent): allow specifying agent for routes in route files

internal/route/route.go

@@ -50,6 +50,7 @@ type (
 		Middlewares  map[string]docker.LabelMap     `json:"middlewares,omitempty"`
 		Homepage     *homepage.ItemConfig           `json:"homepage,omitempty"`
 		AccessLog    *accesslog.RequestLoggerConfig `json:"access_log,omitempty"`
+		Agent        string                         `json:"agent,omitempty"`
 
 		Idlewatcher *idlewatcher.Config  `json:"idlewatcher,omitempty"`
 		HealthMon   health.HealthMonitor `json:"health,omitempty"`
@@ -76,6 +77,8 @@ type (
 		lastError   gperr.Error
 		provider    routes.Provider
 
+		agent *agent.AgentConfig
+
 		started chan struct{}
 		once    sync.Once
 	}
@@ -94,6 +97,23 @@ func (r *Route) Validate() gperr.Error {
 		return r.lastError
 	}
 	r.isValidated = true
+
+	if r.Agent != "" {
+		if r.Container != nil {
+			return gperr.Errorf("specifying agent is not allowed for docker container routes")
+		}
+		var ok bool
+		// by agent address
+		r.agent, ok = agent.GetAgent(r.Agent)
+		if !ok {
+			// fallback to get agent by name
+			r.agent, ok = agent.GetAgentByName(r.Agent)
+			if !ok {
+				return gperr.Errorf("agent %s not found", r.Agent)
+			}
+		}
+	}
+
 	r.Finalize()
 
 	r.started = make(chan struct{})
@@ -177,7 +197,8 @@ func (r *Route) Validate() gperr.Error {
 		r.Idlewatcher = r.Container.IdlewatcherConfig
 	}
 
-	// return error if route is localhost:<godoxy_port>
+	// return error if route is localhost:<godoxy_port> but route is not agent
+	if !r.IsAgent() {
 		switch r.Host {
 		case "localhost", "127.0.0.1":
 			switch r.Port.Proxy {
@@ -187,6 +208,7 @@ func (r *Route) Validate() gperr.Error {
 				}
 			}
 		}
+	}
 
 	errs := gperr.NewBuilder("entry validation failed")
 
@@ -352,11 +374,11 @@ func (r *Route) Type() route.RouteType {
 }
 
 func (r *Route) GetAgent() *agent.AgentConfig {
-	if r.Container == nil {
+	if r.Container != nil && r.Container.Agent != nil {
-		return nil
-	}
 		return r.Container.Agent
 	}
+	return r.agent
+}
 
 func (r *Route) IsAgent() bool {
 	return r.GetAgent() != nil

internal/route/route_test.go

@@ -148,3 +148,37 @@ func TestPreferredPort(t *testing.T) {
 	port := preferredPort(ports)
 	expect.Equal(t, port, 3000)
 }
+
+func TestDockerRouteDisallowAgent(t *testing.T) {
+	r := &Route{
+		Alias:  "test",
+		Scheme: route.SchemeHTTP,
+		Host:   "example.com",
+		Port:   route.Port{Proxy: 80},
+		Agent:  "test-agent",
+		Metadata: Metadata{
+			Container: &docker.Container{
+				ContainerID: "test-id",
+				Image: &docker.ContainerImage{
+					Name: "test-image",
+				},
+			},
+		},
+	}
+	err := r.Validate()
+	expect.HasError(t, err, "Validate should return error for docker route with agent")
+	expect.ErrorContains(t, err, "specifying agent is not allowed for docker container routes")
+}
+
+func TestRouteAgent(t *testing.T) {
+	r := &Route{
+		Alias:  "test",
+		Scheme: route.SchemeHTTP,
+		Host:   "example.com",
+		Port:   route.Port{Proxy: 80},
+		Agent:  "test-agent",
+	}
+	err := r.Validate()
+	expect.NoError(t, err, "Validate should not return error for valid route with agent")
+	expect.NotNil(t, r.GetAgent(), "GetAgent should return agent")
+}