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# _*_ coding: utf-8 _*_

"""

python_coroutine.py by xianhu

"""

import asyncio

import aiohttp

import threading

# 生产者、消费者例子

def consumer(): # 定义消费者，由于有yeild关键词，此消费者为一个生成器

print("[Consumer] Init Consumer ......")

r = "init ok" # 初始化返回结果，并在启动消费者时，返回给生产者

while True:

n = yield r # 消费者通过yield关键词接收生产者产生的消息，同时返回结果给生产者

print("[Consumer] conusme n = %s, r = %s" % (n, r))

r = "consume %s OK" % n # 消费者消费结果，下个循环返回给生产者

def produce(c): # 定义生产者，此时的 c 为一个生成器

print("[Producer] Init Producer ......")

r = c.send(None) # 启动消费者生成器，同时第一次接收返回结果

print("[Producer] Start Consumer, return %s" % r)

n = 0

while n < 5:

n += 1

print("[Producer] While, Producing %s ......" % n)

r = c.send(n) # 向消费者发送消息，同时准备接收结果。此时会切换到消费者执行

print("[Producer] Consumer return: %s" % r)

c.close() # 关闭消费者生成器

print("[Producer] Close Producer ......")

# produce(consumer())

# 异步IO例子：适配Python3.4，使用asyncio库

@asyncio.coroutine

def hello(index): # 通过装饰器asyncio.coroutine定义协程

print('Hello world! index=%s, thread=%s' % (index, threading.currentThread()))

yield from asyncio.sleep(1) # 模拟IO任务

print('Hello again! index=%s, thread=%s' % (index, threading.currentThread()))@asyncio.coroutine

loop = asyncio.get_event_loop() # 得到一个事件循环模型

tasks = [hello(1), hello(2)] # 初始化任务列表

loop.run_until_complete(asyncio.wait(tasks)) # 执行任务

loop.close() # 关闭事件循环列表

# 异步IO例子：适配Python3.5，使用async和await关键字

async def hello1(index): # 通过关键字async定义协程

print('Hello world! index=%s, thread=%s' % (index, threading.currentThread()))

await asyncio.sleep(1) # 模拟IO任务

print('Hello again! index=%s, thread=%s' % (index, threading.currentThread()))

loop = asyncio.get_event_loop() # 得到一个事件循环模型

tasks = [hello1(1), hello1(2)] # 初始化任务列表

loop.run_until_complete(asyncio.wait(tasks)) # 执行任务

loop.close() # 关闭事件循环列表

# aiohttp 实例

async def get(url):

async with aiohttp.ClientSession() as session:

async with session.get(url) as resp:

print(url, resp.status)

print(url, await resp.text())

loop = asyncio.get_event_loop() # 得到一个事件循环模型

tasks = [ # 初始化任务列表

get("http://zhushou.360.cn/detail/index/soft_id/3283370"),

get("http://zhushou.360.cn/detail/index/soft_id/3264775"),

get("http://zhushou.360.cn/detail/index/soft_id/705490")

]

loop.run_until_complete(asyncio.wait(tasks)) # 执行任务

loop.close() # 关闭事件循环列表

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