grpc with python

python를 사용하여 grpc 서비스 제공 

 

1. 설치

pip install grpcio

pip install grpcio-tools

pip install protobuf

pip install flask

 

2. protobuf 로 IDL 정의

syntax = "proto3";

package demo;

message RequestData {
string data = 1;
}

message ResponseData {
int64 return_code = 1;
string message = 2;
string data = 3;
}

service DemoService {
rpc CreateOne(RequestData) returns (ResponseData) {}
rpc DeleteOne(RequestData) returns (ResponseData) {}
rpc TransferOne(RequestData) returns (ResponseData) {}
rpc GetCreateNotify(RequestData) returns (ResponseData) {}
}

 

3. grpc compile

python -m grpc_tools.protoc -I/usr/local/include -I. \
--grpc_python_out=. \
--python_out=. \
-I./proto/ demo.proto

 

 

4. flask 사용

==============================

 

from flask import Flask
app = Flask(__name__)

import grpc

import demo_pb2
import demo_pb2_grpc


@app.route('/grpc')
def hello_world_grpc():
with grpc.insecure_channel('127.0.0.1:9090') as channel:
client = demo_pb2_grpc.DemoServiceStub(channel)

response = client.CreateOne(demo_pb2.RequestData(
data="call create one from client",
))
print(response.return_code, response.message, response.data)
return 'Hello, World grpc!'


@app.route('/')
def hello_world():
return 'Hello, World!'

 

5. grpc gateway

 

restful api 서비스를 제공하고자 할때 사용

https://github.com/grpc-ecosystem/grpc-gateway