python golang中grpc 使用示例代码详解
hw_owen · 人气:0python
1、使用前准备，安装这三个库
pip install grpcio pip install protobuf pip install grpcio_tools
2、建立一个proto文件hello.proto
// [python quickstart](https://grpc.iohttps://img.qb5200.com/download-x/docs/quickstart/python.html#run-a-grpc-application)
// python -m grpc_tools.protoc --python_out=. --grpc_python_out=. -I. hello.proto
// helloworld.proto
syntax = "proto3";
package test;
service Greeter {
rpc SayHello(HelloRequest) returns (HelloReply) {}
rpc SayHelloAgain(HelloRequest) returns (HelloReply) {}
}
service Greetera{
rpc SayStudent(Studentid) returns (Student){}
}
message Student {
string msg=1;//json
}
message Studentid{
string id=1;
}
message HelloRequest {
string name = 1;
}
message HelloReply {
string message = 1;
}
3、执行命令就会对应生成两个py文件
hello_pb2.py
hello_pb2_grpc.py
python -m grpc_tools.protoc --python_out=. --grpc_python_out=. -I. hello.proto
4、py服务端代码hello.server.py：
from concurrent import futures
import time
import grpc
import hello_pb2
import hello_pb2_grpc
import json
# 实现 proto 文件中定义的 GreeterServicer
class Greeter(hello_pb2_grpc.GreeterServicer):
# 实现 proto 文件中定义的 rpc 调用
def SayHello(self, request, context):
return hello_pb2.HelloReply(message = 'hello {msg}'.format(msg = request.name))
def SayHelloAgain(self, request, context):
return hello_pb2.HelloReply(message='hello {msg}'.format(msg = request.name))
class Gretera(hello_pb2_grpc.GreeteraServicer):
def SayStudent(self,request,context):
print(request.id)
if request.id=="0":
c=hello_pb2.Student(msg=json.dumps({"name":"owen","age":22,"sex":"男"}))
else:
c=hello_pb2.Student(msg=json.dumps({"name":"lihui","age":23,"sex":"女"}))
return c
def serve():
# 启动 rpc 服务
server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
hello_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server)
hello_pb2_grpc.add_GreeteraServicer_to_server(Gretera(),server)
server.add_insecure_port('[::]:50052')
server.start()
try:
while True:
time.sleep(60*60*24) # one day in seconds
except KeyboardInterrupt:
server.stop(0)
if __name__ == '__main__':
serve()
py客户端代码hello.client.py：
import grpc
import hello_pb2
import hello_pb2_grpc
import json
def run():
# 连接 rpc 服务器
channel = grpc.insecure_channel('localhost:50051')
# 调用 rpc 服务
stub = hello_pb2_grpc.GreeterStub(channel)
response = stub.SayHello(hello_pb2.HelloRequest(name='czl'))
print("Greeter client received: " + response.message)
response = stub.SayHelloAgain(hello_pb2.HelloRequest(name='nsdnfkjda'))
print("Greeter client received: " + response.message)
stub1 = hello_pb2_grpc.GreeteraStub(channel)
response1 = stub1.SayStudent(hello_pb2.Studentid(id='1'))
print(json.loads(response1.msg))
if __name__ == '__main__':
run()
golang
由于grpc是跨语言的所以这里用golang做为示范，golang客户端代码，小编这里也踩了许多坑，最主要的是两个proto文件一定要一致，golang 中使用必须安装protoc，windows将环境变量指向安装目录的bin下面：
1、protocal buffer安装
从 https://github.com/google/protobuf/releases 下载 对应自己的系统（环境变量记得改）
2、安装 golang protobuf
go get -u github.com/golang/protobuf/proto // golang protobuf 库 go get -u github.com/golang/protobuf/protoc-gen-go //protoc --go_out 工具
3、安装 gRPC-go
go get google.golang.org/grpc
4、生成go文件
protoc --go_out=plugins=grpc:文件目录 对应的.proto文件 protoc --go_out=plugins=grpc:. hello.proto
生成hello.pb.go，调用的实现hello_go_client.go：
package main
import (
"context"
"encoding/json"
"google.golang.org/grpc"
"log"
"student/test" //对应的生成文件目录
)
type Studenmsg struct {
Name string
Age int
Sex string
}
func main() {
// 建立连接到gRPC服务
conn, err := grpc.Dial("127.0.0.1:50052", grpc.WithInsecure())
if err != nil {
log.Fatalf("did not connect: %v", err)
}
// 函数结束时关闭连接
defer conn.Close()
// 创建Waiter服务的客户端
t := test.NewGreeteraClient(conn)
tr,err:=t.SayStudent(context.Background(),&test.Studentid{Id:"1"})
if err != nil {
log.Fatalf("could not greet: %v", err)
}
var st Studenmsg
err=json.Unmarshal([]byte(tr.Msg),&st)//这里说明一下发过来的数据是json格式转化成struct
if err!=nil{
log.Println(err.Error())
}
log.Println(st.Name,st.Age,st.Sex)
}
总结
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