golang工程— grpc-gateway健康检查和跨域配置

grpc健康检查网关跨域配置

grpc健康检查

grpc健康检查使用

服务端配置

import ("google.golang.org/grpc/health""google.golang.org/grpc/health/grpc_health_v1"
)//添加健康检查服务,多路复用
grpc_health_v1.RegisterHealthServer(s, health.NewServer())

网关配置

gateway.go

package gatewayimport ("context""flag""fmt""google.golang.org/grpc/health/grpc_health_v1""net/http""user/user-server/gateway/middleware""github.com/grpc-ecosystem/grpc-gateway/v2/runtime""google.golang.org/grpc""google.golang.org/grpc/credentials/insecure"_ "google.golang.org/grpc/grpclog"gw "user/proto"  // Update
)var (// command-line options:// gRPC server endpointgrpcServerEndpoint = flag.String("grpc-server-endpoint",  "localhost:50051", "gRPC server endpoint")
)func Run() error {ctx := context.Background()ctx, cancel := context.WithCancel(ctx)defer cancel()// 请求时,将http header中某些字段转发到grpc上下文inComingOpt :=  runtime.WithIncomingHeaderMatcher(func(s string) (string, bool) {fmt.Println("header:" + s)switch s {case "Service-Authorization":fmt.Println("Service-Authorization hit")return "Service-Authorization", truedefault:return "", false}})// 响应后,grpc上下文转发到http头部outGoingOpt := runtime.WithOutgoingHeaderMatcher(func(s string) (string, bool) {return "", false})//创建连接,用于健康检查conn, err := grpc.Dial(*grpcServerEndpoint, grpc.WithTransportCredentials(insecure.NewCredentials()))if err != nil {return err}// Register gRPC server endpoint// Note: Make sure the gRPC server is running properly and accessible// runtime.WithHealthEndpointAt() 指定路径， 转发Header到grpc上下文在这是不生效的inCommingOpt 是不生效的，因为我们在这弄了个客户端，需要手动转发操作。或者排除掉，我们这选择排除掉mux := runtime.NewServeMux(inComingOpt, outGoingOpt, runtime.WithHealthzEndpoint(grpc_health_v1.NewHealthClient(conn)))//添加文件上传处理函数mux.HandlePath("POST", "/upload", uploadHandler)handler := middleware.Cors(mux)opts := []grpc.DialOption{grpc.WithTransportCredentials(insecure.NewCredentials())}err = gw.RegisterUserHandlerFromEndpoint(ctx, mux,  *grpcServerEndpoint, opts)if err != nil {return err}// Start HTTP server (and proxy calls to gRPC server endpoint)return http.ListenAndServe(":8081", handler)
}

如果网关中设置了拦截器之类的进行鉴权判断，可以通过FullName="/grpc.health.v1.Health/Check"去忽略鉴权

监控检查默认请求 http://localhost:8081/healthz

grpc网关跨域配置

采用中间件的形式封装httphandler

package middlewareimport "net/http"func Cors(handler http.Handler) http.Handler {return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {method := r.Methodorigin := r.Header.Get("Origin")if origin != "" {// 允许来源配置w.Header().Set("Access-Control-Allow-Origin", "*") // 可将将 * 替换为指定的域名w.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE, UPDATE, PATCH")w.Header().Set("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization")w.Header().Set("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers, Cache-Control, Content-Language, Content-Type")w.Header().Set("Access-Control-Allow-Credentials", "true")}if method == "OPTIONS" {w.WriteHeader(http.StatusNoContent)return}handler.ServeHTTP(w, r)})
}

然后修改gateway

gateway.go

package gatewayimport ("context""flag""fmt""google.golang.org/grpc/health/grpc_health_v1""net/http""user/user-server/gateway/middleware""github.com/grpc-ecosystem/grpc-gateway/v2/runtime""google.golang.org/grpc""google.golang.org/grpc/credentials/insecure"_ "google.golang.org/grpc/grpclog"gw "user/proto"  // Update
)var (// command-line options:// gRPC server endpointgrpcServerEndpoint = flag.String("grpc-server-endpoint",  "localhost:50051", "gRPC server endpoint")
)func Run() error {ctx := context.Background()ctx, cancel := context.WithCancel(ctx)defer cancel()// 请求时,将http header中某些字段转发到grpc上下文inComingOpt :=  runtime.WithIncomingHeaderMatcher(func(s string) (string, bool) {fmt.Println("header:" + s)switch s {case "Service-Authorization":fmt.Println("Service-Authorization hit")return "Service-Authorization", truedefault:return "", false}})// 响应后,grpc上下文转发到http头部outGoingOpt := runtime.WithOutgoingHeaderMatcher(func(s string) (string, bool) {return "", false})//创建连接,用于健康检查conn, err := grpc.Dial(*grpcServerEndpoint, grpc.WithTransportCredentials(insecure.NewCredentials()))if err != nil {return err}// Register gRPC server endpoint// Note: Make sure the gRPC server is running properly and accessible// runtime.WithHealthEndpointAt() 指定路径， 转发Header到grpc上下文在这是不生效的inCommingOpt 是不生效的，因为我们在这弄了个客户端，需要手动转发操作。或者排除掉，我们这选择排除掉mux := runtime.NewServeMux(inComingOpt, outGoingOpt, runtime.WithHealthzEndpoint(grpc_health_v1.NewHealthClient(conn)))//添加文件上传处理函数mux.HandlePath("POST", "/upload", uploadHandler)handler := middleware.Cors(mux)opts := []grpc.DialOption{grpc.WithTransportCredentials(insecure.NewCredentials())}err = gw.RegisterUserHandlerFromEndpoint(ctx, mux,  *grpcServerEndpoint, opts)if err != nil {return err}// Start HTTP server (and proxy calls to gRPC server endpoint)return http.ListenAndServe(":8081", handler)
}

更多grpc跨域配置的内容见

[gin中间件编程与跨域配置](