JSON RPC with HTTP2 与 grpc 有什么区别

JSON RPC与HTTP2是两种不同的通信协议，而gRPC则是基于HTTP2的一种远程过程调用（RPC）框架。本文将分别介绍JSON RPC、HTTP2和gRPC，并比较它们之间的区别。

POST /jsonrpc HTTP/1.1
Host: example.com
Content-Type: application/json
{
  "jsonrpc": "2.0",
  "method": "sum",
  "params": [1, 2],
  "id": 1
}

HTTP/1.1 200 OK
Content-Type: application/json
{
  "jsonrpc": "2.0",
  "result": 3,
  "id": 1
}

protobuf
syntax = "proto3";
service Calculator {
  rpc Add (AddRequest) returns (AddResponse) {}
}
message AddRequest {
  int32 a = 1;
  int32 b = 2;
}
message AddResponse {
  int32 sum = 1;
}

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

go
package main
import (
	"context"
	"fmt"
	"log"
	"net"
	pb "path/to/generated/proto"
	"google.golang.org/grpc"
)
type calculatorServer struct{}
func (s *calculatorServer) Add(ctx context.Context, req *pb.AddRequest) (*pb.AddResponse, error) {
	sum := req.A + req.B
	return &pb.AddResponse{Sum: sum}, nil
}
func main() {
	listen, err := net.Listen("tcp", ":50051")
	if err != nil {
		log.Fatalf("failed to listen: %v", err)
	}
	grpcServer := grpc.NewServer()
	pb.RegisterCalculatorServer(grpcServer, &calculatorServer{})
	if err := grpcServer.Serve(listen); err != nil {
		log.Fatalf("failed to serve: %v", err)
	}
}

go
package main
import (
	"context"
	"fmt"
	"log"
	pb "path/to/generated/proto"
	"google.golang.org/grpc"
)
func main() {
	conn, err := grpc.Dial(":50051", grpc.WithInsecure())
	if err != nil {
		log.Fatalf("failed to connect: %v", err)
	}
	defer conn.Close()
	client := pb.NewCalculatorClient(conn)
	req := &pb.AddRequest{A: 1, B: 2}
	res, err := client.Add(context.Background(), req)
	if err != nil {
		log.Fatalf("failed to call Add: %v", err)
	}
	fmt.Println(res.Sum)
}