add gin examples

examples/go.mod

@@ -13,6 +13,7 @@ require (
 	github.com/go-errors/errors v1.4.0 // indirect
 	github.com/go-kratos/consul v0.1.2
 	github.com/go-kratos/etcd v0.1.0
+	github.com/go-kratos/gin v0.1.0
 	github.com/go-kratos/kratos/v2 v2.0.0
 	github.com/go-kratos/nacos v0.1.0
 	github.com/go-kratos/prometheus v0.0.0-20210522055322-137e29e7cf47

examples/go.sum

@@ -172,6 +172,10 @@ github.com/go-kratos/consul v0.1.2 h1:vryYF2o3wWQzFyzqKKKc1+GX/FY9T7DSkM3nc/Hy6/
 github.com/go-kratos/consul v0.1.2/go.mod h1:FhxdCfkqaqIYfgpGbzGb8ywM/zV3jk+EBS+WSy1FzQQ=
 github.com/go-kratos/etcd v0.1.0 h1:ewAfloZcpcg2L1QB1VLXYUMdvfUU0i3kAlToHrxTv2g=
 github.com/go-kratos/etcd v0.1.0/go.mod h1:RzWYbka3LjS0v2RbCtADN7d2Ng8eH774ehHlTGgbma4=
+github.com/go-kratos/gin v0.0.0-20210718022314-0365ef99696f h1:BrWyGMOTPEgu1lpecOCOiNClggXehjK6ox00Yb/GhyY=
+github.com/go-kratos/gin v0.0.0-20210718022314-0365ef99696f/go.mod h1:KzE88+mV1QJdmiT+sU2D560ucOXnWZx+4m0OnVcSyzQ=
+github.com/go-kratos/gin v0.1.0 h1:yq5GfZnSNo8cOIqxqPE0FVNQ8fm++oKQBd3/rTTp4oI=
+github.com/go-kratos/gin v0.1.0/go.mod h1:KzE88+mV1QJdmiT+sU2D560ucOXnWZx+4m0OnVcSyzQ=
 github.com/go-kratos/nacos v0.1.0 h1:sUvTsgZ4u88YaKF/jAi2Rdr+hzPCfQtmNjBpiyEbbJ0=
 github.com/go-kratos/nacos v0.1.0/go.mod h1:qhVsyp6RyDDEKLtT0/iTMaN3D7SheRMrYb2bV0jYqjw=
 github.com/go-kratos/prometheus v0.0.0-20210522055322-137e29e7cf47 h1:uJennLdg0rwhrIl0bjsObwub+I3U0vJGAhpK6CYASrM=

examples/http/gin/main.go

@@ -1,17 +1,43 @@
 package main
 
 import (
+	"context"
+	"fmt"
 	"log"
 
 	"github.com/gin-gonic/gin"
+	kgin "github.com/go-kratos/gin"
 	"github.com/go-kratos/kratos/v2"
+	"github.com/go-kratos/kratos/v2/errors"
+	"github.com/go-kratos/kratos/v2/middleware"
+	"github.com/go-kratos/kratos/v2/middleware/recovery"
+	"github.com/go-kratos/kratos/v2/transport"
 	"github.com/go-kratos/kratos/v2/transport/http"
 )
 
+func customMiddleware(handler middleware.Handler) middleware.Handler {
+	return func(ctx context.Context, req interface{}) (reply interface{}, err error) {
+		if tr, ok := transport.FromServerContext(ctx); ok {
+			fmt.Println("operation:", tr.Operation())
+		}
+		reply, err = handler(ctx, req)
+		return
+	}
+}
+
 func main() {
 	router := gin.Default()
-	router.GET("/home", func(ctx *gin.Context) {
-		ctx.String(200, "Hello Gin!")
+	// 使用kratos中间件
+	router.Use(kgin.Middlewares(recovery.Recovery(), customMiddleware))
+
+	router.GET("/helloworld/:name", func(ctx *gin.Context) {
+		name := ctx.Param("name")
+		if name == "error" {
+			// 返回kratos error
+			kgin.Error(ctx, errors.Unauthorized("auth_error", "no authentication"))
+		} else {
+			ctx.JSON(200, map[string]string{"welcome": name})
+		}
 	})
 
 	httpSrv := http.NewServer(http.Address(":8000"))