API: Added ping endpoint to check if service is available

Dockerfile

@@ -21,4 +21,5 @@ COPY --from=builder /go/src/${PACKAGE}/httpcache /httpcache
 
 USER nobody:nobody
 
+EXPOSE 8000
 ENTRYPOINT ["./httpcache"]

README.md

@@ -75,4 +75,10 @@ client = &http.Client{
 
 client.Do(req)
 ...
-```
+```
+
+## Run container
+It's expose port 8000 and run a spefici container by id
+```bash
+sudo docker run  -p 8000:8000 {{container_id}} 
+```

cmd/httpcache/main.go

@@ -54,10 +54,12 @@ func main() {
 
 	proxy := handler.NewProxy(c, logger.Println, *responseBodyContentLenghtLimit)
 	stats := handler.NewStats(c, logger.Println)
+	ping := handler.NewPing(logger.Println)
 
 	mux := http.NewServeMux()
 	mux.Handle("/stats", stats)
 	mux.Handle("/", proxy)
+	mux.Handle("/ping", ping)
 
 	stack := middleware.NewPanic(mux, logger.Println)
 

internal/handler/ping.go

@@ -0,0 +1,22 @@
+package handler
+
+import (
+	"net/http"
+)
+
+func NewPing(logger func(v ...interface{})) *Ping {
+	return &Ping{
+		logger: logger,
+	}
+}
+
+type Ping struct {
+	logger func(v ...interface{})
+}
+
+func (s *Ping) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
+	s.logger("pinged cache")
+	resp.WriteHeader(http.StatusOK)
+	resp.Write([]byte("ok"))
+}
+