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pbgo: mini rpc/rest framework based on Protobuf

Features

• protoc plugin generate code
• define rpc api with Protobuf, generate stub code, work with standard net/rpc framework
• define rest api with Protobuf, and generate service and client code
• work with grpc framework

Install

1. install protoc at first: http://github.com/google/protobuf/releases
2. go get github.com/chai2010/pbgo
3. go get github.com/chai2010/pbgo/protoc-gen-pbgo
4. go run hello.go

Example (net/rpc)

create proto file:

syntax = "proto3";
package hello_pb;

message String {
	string value = 1;
}
message Message {
	string value = 1;
}

service HelloService {
	rpc Hello (String) returns (String);
	rpc Echo (Message) returns (Message);
}

generate rpc code:

$ protoc -I=. -I=$GOPATH/src --pbgo_out=. hello.proto

use generate code:

package main

import (
	"fmt"
	"log"
	"net"
	"net/rpc"

	"github.com/chai2010/pbgo/examples/hello.pb"
)

type HelloService struct{}

func (p *HelloService) Hello(request *hello_pb.String, reply *hello_pb.String) error {
	reply.Value = "hello:" + request.GetValue()
	return nil
}
func (p *HelloService) Echo(request *hello_pb.Message, reply *hello_pb.Message) error {
	*reply = *request
	return nil
}

func startRpcServer() {
	hello_pb.RegisterHelloService(rpc.DefaultServer, new(HelloService))

	listener, err := net.Listen("tcp", ":1234")
	if err != nil {
		log.Fatal("ListenTCP error:", err)
	}

	for {
		conn, err := listener.Accept()
		if err != nil {
			log.Fatal("Accept error:", err)
		}

		go rpc.ServeConn(conn)
	}
}

func tryRpcClient() {
	client, err := hello_pb.DialHelloService("tcp", "localhost:1234")
	if err != nil {
		log.Fatal(err)
	}

	reply, err := client.Hello(&hello_pb.String{Value: "gopher"})
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(reply.GetValue())
}

func main() {
	go startRpcServer()
	tryRpcClient()
}

Example (rest api)

create proto file:

syntax = "proto3";
package hello_pb;

import "github.com/chai2010/pbgo/pbgo.proto";

message String {
	string value = 1;
}

message Message {
	string value = 1;
	repeated int32 array = 2;
	map<string,string> dict = 3;
	String subfiled = 4;
}

message StaticFile {
	string content_type = 1;
	bytes content_body = 2;
}

service HelloService {
	rpc Hello (String) returns (String) {
		option (pbgo.rest_api) = {
			get: "/hello/:value"
			post: "/hello"

			additional_bindings {
				method: "DELETE"; url: "/hello"
			}
			additional_bindings {
				method: "PATCH"; url: "/hello"
			}
		};
	}
	rpc Echo (Message) returns (Message) {
		option (pbgo.rest_api) = {
			get: "/echo/:subfiled.value"
		};
	}
	rpc Static(String) returns (StaticFile) {
		option (pbgo.rest_api) = {
			additional_bindings {
				method: "GET";
				url: "/static/:value";
				content_type: ":content_type";
				content_body: ":content_body"
			}
		};
	}
}

generate rpc/rest code:

$ protoc -I=. -I=$GOPATH/src --pbgo_out=. hello.proto

use generate code:

package main

import (
	"io/ioutil"
	"log"
	"mime"
	"net/http"
	"time"

	"github.com/chai2010/pbgo/examples/hello.pb"
)

type HelloService struct{}

func (p *HelloService) Hello(request *hello_pb.String, reply *hello_pb.String) error {
	reply.Value = "hello:" + request.GetValue()
	return nil
}
func (p *HelloService) Echo(request *hello_pb.Message, reply *hello_pb.Message) error {
	*reply = *request
	return nil
}
func (p *HelloService) Static(request *hello_pb.String, reply *hello_pb.StaticFile) error {
	data, err := ioutil.ReadFile("./testdata/" + request.Value)
	if err != nil {
		return err
	}

	reply.ContentType = mime.TypeByExtension(request.Value)
	reply.ContentBody = data
	return nil
}

func someMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(wr http.ResponseWriter, r *http.Request) {
		timeStart := time.Now()
		defer func() {
			timeElapsed := time.Since(timeStart)
			log.Println(r.Method, r.URL, timeElapsed)
		}()

		next.ServeHTTP(wr, r)
	})
}

func main() {
	router := hello_pb.HelloServiceHandler(new(HelloService))
	log.Fatal(http.ListenAndServe(":8080", someMiddleware(router)))
}

Go client:

func main() {
	var reply hello_pb.Message
	err := pbgo.HttpDo("GET", "http://127.0.0.1:8080/echo/xx",
		&hello_pb.Message{
			Value: "chai2010",
			Array: []int32{1, 2, 3},
		},
		&reply,
	)
	if err != nil {
		println("aaa")
		log.Fatal(err)
	}

	// {chai2010 [1 2 3] map[] value:"xx"  {} [] 0}
	fmt.Println(reply)
}

CURL client:

$ curl localhost:8080/hello/gopher
{"value":"hello:gopher"}
$ curl "localhost:8080/hello/gopher?value=vgo"
{"value":"hello:vgo"}
$ curl localhost:8080/hello -X POST --data '{"value":"cgo"}'
{"value":"hello:cgo"}

$ curl localhost:8080/echo/gopher
{"subfiled":{"value":"gopher"}}
$ curl "localhost:8080/echo/gopher?array=123&array=456"
{"array":[123,456],"subfiled":{"value":"gopher"}}
$ curl "localhost:8080/echo/gopher?dict%5Babc%5D=123"
{"dict":{"abc":"123"},"subfiled":{"value":"gopher"}}

$ curl localhost:8080/static/gopher.png
$ curl localhost:8080/static/hello.txt

Rest Client

https://github.com/chubin/wttr.in

$ curl http://wttr.in/wuhan?format=j1
$ curl http://wttr.in/武汉?format=j1

func main() {
	var reply struct {
		CurrentCondition []struct {
			FeelsLikeC       string `json:"FeelsLikeC"`
			FeelsLikeF       string `json:"FeelsLikeF"`
			Cloudcover       string `json:"cloudcover"`
			Humidity         string `json:"humidity"`
			LocalObsDateTime string `json:"localObsDateTime"`
			Observation_time string `json:"observation_time"`
		} `json:"current_condition"`
	}

	err := pbgo.HttpGet("http://wttr.in/wuhan?format=j1", nil, &reply)
	if err != nil {
		log.Fatal(err)
	}

	json, err := json.MarshalIndent(reply, "", "  ")
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(string(json))
}

Form Example

Create example/form_pb/comment.proto:

syntax = "proto3";
package form_pb;

message Comment {
	string user = 1;
	string email = 2;
	string url = 3;
	string text = 4;
	string next = 5; // redirect
}

generate proto code:

$ protoc -I=. --go_out=. comment.proto

create web server:

package main

import (
	"github.com/chai2010/pbgo"
	"github.com/chai2010/pbgo/examples/form_pb"
	"github.com/julienschmidt/httprouter"
)

func main() {
	router := httprouter.New()

	// http://localhost:8080
	router.GET("/", func(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
		w.Header().Add("Content-Type", "text/html; charset=utf-8")

		fmt.Fprint(w, `
			<form method="POST" action="/api/comment">
				<input type="text" name="user" value="user name">
				<input type="email" name="email" value="[email protected]">
				<input name="url" value="http://chai2010.cn"></textarea>
				<textarea name="text" value="text">www</textarea>
				<input type="text" name="next" value="/thanks">
				<button type="submit">Send Test</button>
			</form>
		`)
	})

	router.GET("/thanks", func(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
		fmt.Fprintln(w, "Thanks")
	})

	// curl -d "user=chai&[email protected]&text=hello&next=http://github.com" localhost:8080/api/comment
	router.POST("/api/comment", func(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
		var form form_pb.Comment
		if err := pbgo.BindForm(r, &form); err != nil {
			http.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
			log.Println("err:", err)
			return
		}

		if form.Next != "" {
			http.Redirect(w, r, form.Next, http.StatusFound)
		}

		log.Println("form:", form)
	})

	log.Fatal(http.ListenAndServe(":8080", router))
}

$ curl -d "user=chai&[email protected]&text=hello&next=http://github.com" localhost:8080/api/comment-form
{"user":"chai","email":"[email protected]","text":"hello","next":"http://github.com"}

gRPC & Rest Example

See https://github.com/chai2010/pbgo-grpc

BUGS

Report bugs to [email protected].

Thanks!