|
|
|
# Copyright 2019 gRPC authors.
|
|
|
|
#
|
|
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
|
|
# you may not use this file except in compliance with the License.
|
|
|
|
# You may obtain a copy of the License at
|
|
|
|
#
|
|
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
#
|
|
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
|
|
# See the License for the specific language governing permissions and
|
|
|
|
# limitations under the License.
|
|
|
|
"""The example of four ways of data transmission using gRPC in Python."""
|
|
|
|
|
|
|
|
import time
|
|
|
|
import grpc
|
|
|
|
|
|
|
|
import demo_pb2_grpc
|
|
|
|
import demo_pb2
|
|
|
|
|
|
|
|
SERVER_ADDRESS = "localhost:23333"
|
|
|
|
CLIENT_ID = 1
|
|
|
|
|
|
|
|
|
|
|
|
# 一元模式(在一次调用中, 客户端只能向服务器传输一次请求数据, 服务器也只能返回一次响应)
|
|
|
|
# unary-unary(In a single call, the client can only send request once, and the server can
|
|
|
|
# only respond once.)
|
|
|
|
def simple_method(stub):
|
|
|
|
print("--------------Call SimpleMethod Begin--------------")
|
|
|
|
request = demo_pb2.Request(
|
|
|
|
client_id=CLIENT_ID, request_data="called by Python client")
|
|
|
|
response = stub.SimpleMethod(request)
|
|
|
|
print("resp from server(%d), the message=%s" % (response.server_id,
|
|
|
|
response.response_data))
|
|
|
|
print("--------------Call SimpleMethod Over---------------")
|
|
|
|
|
|
|
|
|
|
|
|
# 客户端流模式(在一次调用中, 客户端可以多次向服务器传输数据, 但是服务器只能返回一次响应)
|
|
|
|
# stream-unary (In a single call, the client can transfer data to the server several times,
|
|
|
|
# but the server can only return a response once.)
|
|
|
|
def client_streaming_method(stub):
|
|
|
|
print("--------------Call ClientStreamingMethod Begin--------------")
|
|
|
|
|
|
|
|
# 创建一个生成器
|
|
|
|
# create a generator
|
|
|
|
def request_messages():
|
|
|
|
for i in range(5):
|
|
|
|
request = demo_pb2.Request(
|
|
|
|
client_id=CLIENT_ID,
|
|
|
|
request_data=("called by Python client, message:%d" % i))
|
|
|
|
yield request
|
|
|
|
|
|
|
|
response = stub.ClientStreamingMethod(request_messages())
|
|
|
|
print("resp from server(%d), the message=%s" % (response.server_id,
|
|
|
|
response.response_data))
|
|
|
|
print("--------------Call ClientStreamingMethod Over---------------")
|
|
|
|
|
|
|
|
|
|
|
|
# 服务端流模式(在一次调用中, 客户端只能一次向服务器传输数据, 但是服务器可以多次返回响应)
|
|
|
|
# unary-stream (In a single call, the client can only transmit data to the server at one time,
|
|
|
|
# but the server can return the response many times.)
|
|
|
|
def server_streaming_method(stub):
|
|
|
|
print("--------------Call ServerStreamingMethod Begin--------------")
|
|
|
|
request = demo_pb2.Request(
|
|
|
|
client_id=CLIENT_ID, request_data="called by Python client")
|
|
|
|
response_iterator = stub.ServerStreamingMethod(request)
|
|
|
|
for response in response_iterator:
|
|
|
|
print("recv from server(%d), message=%s" % (response.server_id,
|
|
|
|
response.response_data))
|
|
|
|
|
|
|
|
print("--------------Call ServerStreamingMethod Over---------------")
|
|
|
|
|
|
|
|
|
|
|
|
# 双向流模式 (在一次调用中, 客户端和服务器都可以向对方多次收发数据)
|
|
|
|
# stream-stream (In a single call, both client and server can send and receive data
|
|
|
|
# to each other multiple times.)
|
|
|
|
def bidirectional_streaming_method(stub):
|
|
|
|
print(
|
|
|
|
"--------------Call BidirectionalStreamingMethod Begin---------------")
|
|
|
|
|
|
|
|
# 创建一个生成器
|
|
|
|
# create a generator
|
|
|
|
def request_messages():
|
|
|
|
for i in range(5):
|
|
|
|
request = demo_pb2.Request(
|
|
|
|
client_id=CLIENT_ID,
|
|
|
|
request_data=("called by Python client, message: %d" % i))
|
|
|
|
yield request
|
|
|
|
time.sleep(1)
|
|
|
|
|
|
|
|
response_iterator = stub.BidirectionalStreamingMethod(request_messages())
|
|
|
|
for response in response_iterator:
|
|
|
|
print("recv from server(%d), message=%s" % (response.server_id,
|
|
|
|
response.response_data))
|
|
|
|
|
|
|
|
print("--------------Call BidirectionalStreamingMethod Over---------------")
|
|
|
|
|
|
|
|
|
|
|
|
def main():
|
|
|
|
with grpc.insecure_channel(SERVER_ADDRESS) as channel:
|
|
|
|
stub = demo_pb2_grpc.GRPCDemoStub(channel)
|
|
|
|
|
|
|
|
simple_method(stub)
|
|
|
|
|
|
|
|
client_streaming_method(stub)
|
|
|
|
|
|
|
|
server_streaming_method(stub)
|
|
|
|
|
|
|
|
bidirectional_streaming_method(stub)
|
|
|
|
|
|
|
|
|
|
|
|
if __name__ == '__main__':
|
|
|
|
main()
|