prometheus metrics server

pkg/router/handler.go

@@ -0,0 +1,61 @@
+package router
+
+import (
+	"context"
+	"errors"
+	"github.com/gin-gonic/gin"
+	log "github.com/sirupsen/logrus"
+	ginprometheus "github.com/zsais/go-gin-prometheus"
+	"net/http"
+)
+
+type Handler struct {
+	srv *http.Server
+}
+
+type Deps struct {
+	Addr    string
+	GinMode string
+}
+
+const pkgLogHeader string = "Router |"
+
+func NewHandler(deps Deps) *Handler {
+	engine := gin.Default()
+
+	if deps.GinMode == "release" {
+		gin.SetMode(gin.ReleaseMode)
+		err := engine.SetTrustedProxies([]string{"172.20.0.0/16"})
+		if err != nil {
+			log.WithError(err).Errorf("%v Set proxies failed", pkgLogHeader)
+			return nil
+		}
+	}
+
+	engine.GET("/", func(c *gin.Context) { c.JSON(200, gin.H{"msg": "v2"}) })
+
+	p := ginprometheus.NewPrometheus("gin")
+	p.Use(engine)
+
+	srv := http.Server{
+		Addr:    deps.Addr,
+		Handler: engine,
+	}
+
+	return &Handler{
+		srv: &srv,
+	}
+}
+
+func (h *Handler) Run() error {
+	log.Infof("Starting server on %s", h.srv.Addr)
+	if err := h.srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+		log.WithError(err).Errorf("%v ListenAndServe failed", pkgLogHeader)
+		return err
+	}
+	return nil
+}
+
+func (h *Handler) Shutdown(ctx context.Context) error {
+	return h.srv.Shutdown(ctx)
+}