Python の gRPC で Redis のデータを削除 (Delete)

設定ファイル、サーバープログラム、クライアントプログラムの３つが必要です。

設定ファイル

redis_delete.proto

syntax = "proto3";

package redis_delete;

service Greeter {
	rpc RedisDelete (RedisRequest) returns (RedisReply) {}
}

message RedisRequest {
	string key = 1;
}

message RedisReply {
	string key = 1;
}

サーバープログラム

redis_delete_server.py

#! /usr/bin/python
#
#	redis_delete_server.py
#
#					Feb/08/2020
# --------------------------------------------------------------
import sys
import json
import redis
from concurrent import futures
import logging
import	datetime

import grpc

import redis_delete_pb2
import redis_delete_pb2_grpc

# --------------------------------------------------------------
def redis_delete_proc(key_in):
	rr = redis.Redis(host='localhost', port=6379, db=0)
#
	rr.delete(key_in)
#
# --------------------------------------------------------------
class Greeter(redis_delete_pb2_grpc.GreeterServicer):

	def RedisDelete(self, request, context):
		sys.stderr.write("*** RedisRead ***\n")
		sys.stderr.write("*** key = %s ***\n" % request.key)
		redis_delete_proc(request.key)
		return redis_delete_pb2.RedisReply(key=request.key)

# --------------------------------------------------------------
def serve():
	server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
	redis_delete_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server)
	server.add_insecure_port('[::]:50051')
	server.start()
	server.wait_for_termination()

# --------------------------------------------------------------
if __name__ == '__main__':
	logging.basicConfig()
	serve()
# --------------------------------------------------------------

クライアントプログラム

redis_delete_client.py

#! /usr/bin/python
#
#	redis_delete_client.py
#
#					Feb/08/2020
#
# --------------------------------------------------------------
from __future__ import print_function
import logging
import json
import grpc
import sys

import redis_delete_pb2
import redis_delete_pb2_grpc

# --------------------------------------------------------------
def run():
	key_in = sys.argv[1]
#
	with grpc.insecure_channel('localhost:50051') as channel:
		stub = redis_delete_pb2_grpc.GreeterStub(channel)
		response = stub.RedisDelete(redis_delete_pb2.RedisRequest \
			(key=key_in))
		print("Greeter client received aa: " + response.key)
#
# --------------------------------------------------------------
if __name__ == '__main__':
	logging.basicConfig()
	run()
# --------------------------------------------------------------

gRPC のコードを作成します。

python -m grpc_tools.protoc -I. \
	--python_out=. \
	--grpc_python_out=. \
	./redis_delete.proto

サーバープログラムの起動

./redis_delete_server.py

クライアントプログラムの実行

$ ./redis_delete_client.py t0934
Greeter client received aa: t0934