#golang Prometheus

参考代码： Open-IM-Server

基础： https://www.maocaoying.com/topic/950

http :
if config.Config.Prometheus.Enable {
		promePkg.NewApiRequestCounter()
		promePkg.NewApiRequestFailedCounter()
		promePkg.NewApiRequestSuccessCounter()
		r.Use(promePkg.PromeTheusMiddleware)
		r.GET("/metrics", promePkg.PrometheusHandler())
	}
----------
func PrometheusHandler() gin.HandlerFunc {
	h := promhttp.Handler()
	return func(c *gin.Context) {
		h.ServeHTTP(c.Writer, c.Request)
	}
}

-------
func PromeTheusMiddleware(c *gin.Context) {
	PromeInc(ApiRequestCounter)
	w := &responseBodyWriter{body: &bytes.Buffer{}, ResponseWriter: c.Writer}
	c.Writer = w
	c.Next()
	if c.Writer.Status() == http.StatusOK {
		PromeInc(ApiRequestSuccessCounter)
	} else {
		PromeInc(ApiRequestFailedCounter)
	}
}

grpc:
	var grpcOpts []grpc.ServerOption
	if config.Config.Prometheus.Enable {
		promePkg.NewGrpcRequestCounter()
		promePkg.NewGrpcRequestFailedCounter()
		promePkg.NewGrpcRequestSuccessCounter()
		promePkg.NewUserRegisterCounter()
		promePkg.NewUserLoginCounter()
		grpcOpts = append(grpcOpts, []grpc.ServerOption{
			// grpc.UnaryInterceptor(promePkg.UnaryServerInterceptorProme),
			grpc.StreamInterceptor(grpcPrometheus.StreamServerInterceptor),
			grpc.UnaryInterceptor(grpcPrometheus.UnaryServerInterceptor),
		}...)
	}
	srv := grpc.NewServer(grpcOpts...)
	defer srv.GracefulStop()

// rpc 打开rpc同时也提供http metrics接口,在 rpc.run()之前
func StartPromeSrv(promethuesPort int) error {
	if config.Config.Prometheus.Enable {
		http.Handle("/metrics", promhttp.Handler())
		err := http.ListenAndServe(":"+strconv.Itoa(promethuesPort), nil)
		return err
	}
	return nil
}