feat: Ignore agent pprof port in listening ports (#6515)

* feat: Ignore agent pprof port in listening ports

agent/api.go

@@ -11,7 +11,7 @@ import (
 	"github.com/coder/coder/codersdk"
 )
 
-func (*agent) apiHandler() http.Handler {
+func (a *agent) apiHandler() http.Handler {
 	r := chi.NewRouter()
 	r.Get("/", func(rw http.ResponseWriter, r *http.Request) {
 		httpapi.Write(r.Context(), rw, http.StatusOK, codersdk.Response{
@@ -19,16 +19,24 @@ func (*agent) apiHandler() http.Handler {
 		})
 	})
 
-	lp := &listeningPortsHandler{}
+	// Make a copy to ensure the map is not modified after the handler is
+	// created.
+	cpy := make(map[int]string)
+	for k, b := range a.ignorePorts {
+		cpy[k] = b
+	}
+
+	lp := &listeningPortsHandler{ignorePorts: cpy}
 	r.Get("/api/v0/listening-ports", lp.handler)
 
 	return r
 }
 
 type listeningPortsHandler struct {
-	mut   sync.Mutex
-	ports []codersdk.WorkspaceAgentListeningPort
-	mtime time.Time
+	mut         sync.Mutex
+	ports       []codersdk.WorkspaceAgentListeningPort
+	mtime       time.Time
+	ignorePorts map[int]string
 }
 
 // handler returns a list of listening ports. This is tested by coderd's