Go Grpc Gateway兼容HTTP协议文档自动生成网关_Golang

go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway
go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger
go get -u github.com/golang/protobuf/protoc-gen-go

cd $GOPATH/src/
mkdir -p grpc-gateway-demo/gateway
cd grpc-gateway-demo/gateway
vim gateway.proto
syntax = "proto3";
package gateway;
# 新增以下引入
import "google/api/annotations.proto";
message StringMessage {
string value = 1;
}
# 修改方法增加http定义
# service Gateway {
# rpc SayHello Echo(StringMessage) returns (StringMessage) {}
# }
service Gateway {
rpc Echo(StringMessage) returns (StringMessage) {
option (google.api.http) = {
post: "/v1/example/echo"
body: "*"
};
}
}

cd ..
vim grpc_service.go
package main
import (
"log"
"net"
pb "grpc-gateway-demo/gateway"
"google.golang.org/grpc"
"golang.org/x/net/context"
)
const (
PORT = ":9192"
)
type server struct {}
func (s *server) Echo(ctx context.Context, in *pb.StringMessage) (*pb.StringMessage, error) {
log.Println("request: ", in.Value)
return &pb.StringMessage{Value: "Hello " + in.Value}, nil
}
func main() {
lis, err := net.Listen("tcp", PORT)
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
s := grpc.NewServer()
pb.RegisterGatewayServer(s, &server{})
log.Println("rpc服务已经开启")
s.Serve(lis)
}

go build grpc_service.go
./grpc_service

vim grpc_gateway.go
package main
import (
"flag"
"net/http"
"log"
"github.com/golang/glog"
"golang.org/x/net/context"
"github.com/grpc-ecosystem/grpc-gateway/runtime"
"google.golang.org/grpc"
gw "grpc-gateway-demo/gateway"
)
var (
echoEndpoint = flag.String("echo_endpoint", "localhost:9192", "endpoint of Gateway")
)
func run() error {
ctx := context.Background()
ctx, cancel := context.WithCancel(ctx)
defer cancel()
mux := runtime.NewServeMux()
opts := []grpc.DialOption{grpc.WithInsecure()}
err := gw.RegisterGatewayHandlerFromEndpoint(ctx, mux, *echoEndpoint, opts)
if err != nil {
return err
}
log.Println("服务开启")
return http.ListenAndServe(":8080", mux)
}
func main() {
flag.Parse()
defer glog.Flush()
if err := run(); err != nil {
glog.Fatal(err)
}
}

go build grpc_gateway.go
./grpc_gateway

curl -X POST -k http://localhost:8080/v1/example/echo -d '{"value":" world"}'
{"value":"Hello world"}

cd gateway
protoc -I/usr/local/include -I. \
-I$GOPATH/src \
-I$GOPATH/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis \
--swagger_out=logtostderr=true:. \
gateway.proto