feat: use robot to migrate code

Signed-off-by: kubbot & kubecub <3293172751ysy@gmail.com>

pkg/common/prome/prometheus.go

@@ -0,0 +1,82 @@
+package prome
+
+import (
+	"bytes"
+	"github.com/OpenIMSDK/Open-IM-Server/pkg/common/config"
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+func StartPrometheusSrv(prometheusPort int) error {
+	if config.Config.Prometheus.Enable {
+		http.Handle("/metrics", promhttp.Handler())
+		err := http.ListenAndServe(":"+strconv.Itoa(prometheusPort), nil)
+		return err
+	}
+	return nil
+}
+
+func PrometheusHandler() gin.HandlerFunc {
+	h := promhttp.Handler()
+	return func(c *gin.Context) {
+		h.ServeHTTP(c.Writer, c.Request)
+	}
+}
+
+type responseBodyWriter struct {
+	gin.ResponseWriter
+	body *bytes.Buffer
+}
+
+func (r responseBodyWriter) Write(b []byte) (int, error) {
+	r.body.Write(b)
+	return r.ResponseWriter.Write(b)
+}
+
+func PrometheusMiddleware(c *gin.Context) {
+	Inc(ApiRequestCounter)
+	w := &responseBodyWriter{body: &bytes.Buffer{}, ResponseWriter: c.Writer}
+	c.Writer = w
+	c.Next()
+	if c.Writer.Status() == http.StatusOK {
+		Inc(ApiRequestSuccessCounter)
+	} else {
+		Inc(ApiRequestFailedCounter)
+	}
+}
+
+func Inc(counter prometheus.Counter) {
+	if config.Config.Prometheus.Enable {
+		if counter != nil {
+			counter.Inc()
+		}
+	}
+}
+
+func Add(counter prometheus.Counter, add int) {
+	if config.Config.Prometheus.Enable {
+		if counter != nil {
+			counter.Add(float64(add))
+		}
+	}
+}
+
+func GaugeInc(gauges prometheus.Gauge) {
+	if config.Config.Prometheus.Enable {
+		if gauges != nil {
+			gauges.Inc()
+		}
+	}
+}
+
+func GaugeDec(gauges prometheus.Gauge) {
+	if config.Config.Prometheus.Enable {
+		if gauges != nil {
+			gauges.Dec()
+		}
+	}
+}