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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| /* | ||
| Copyright 2022 The Knative Authors | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package networking | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "log" | ||
| "net/http" | ||
| "os" | ||
| "sync" | ||
| "time" | ||
|
|
||
| netheader "knative.dev/networking/pkg/http/header" | ||
| ) | ||
|
|
||
| func StartHealthCheck(ctx context.Context) { | ||
| port := os.Getenv("PROBES_PORT") | ||
| if port == "" { | ||
| port = "8080" | ||
| } | ||
| handler := healthHandler{HealthCheck: newHealthCheck(ctx)} | ||
|
|
||
| // sets up liveness and readiness probes. | ||
| server := http.Server{ReadHeaderTimeout: time.Minute, Handler: &handler, Addr: ":" + port} | ||
|
|
||
| go func() { | ||
| go func() { | ||
| <-ctx.Done() | ||
| _ = server.Shutdown(ctx) | ||
| }() | ||
|
|
||
| // start the web server on port and accept requests | ||
| log.Printf("Readiness and health check server listening on port %s", port) | ||
|
|
||
| if err := server.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) { | ||
| log.Fatal(err) | ||
| } | ||
| }() | ||
| } | ||
|
|
||
| func newHealthCheck(sigCtx context.Context) func() error { | ||
| once := sync.Once{} | ||
| return func() error { | ||
| select { | ||
| // When we get SIGTERM (sigCtx done), let readiness probes start failing. | ||
| case <-sigCtx.Done(): | ||
| once.Do(func() { | ||
| log.Println("Signal context canceled") | ||
| }) | ||
| return errors.New("received SIGTERM from kubelet") | ||
| default: | ||
| return nil | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // healthHandler handles responding to kubelet probes with a provided health check. | ||
| type healthHandler struct { | ||
| HealthCheck func() error | ||
| } | ||
|
|
||
| func (h *healthHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { | ||
| if netheader.IsKubeletProbe(r) { | ||
| if err := h.HealthCheck(); err != nil { | ||
| log.Println("Healthcheck failed: ", err.Error()) | ||
| http.Error(w, err.Error(), http.StatusInternalServerError) | ||
| } else { | ||
| w.WriteHeader(http.StatusOK) | ||
| } | ||
| return | ||
| } | ||
| http.Error(w, "Unexpected request", http.StatusBadRequest) | ||
| } |