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python的异步IO模块

时间:2019-03-08 20:55:59      阅读:202      评论:0      收藏:0      [点我收藏+]

标签:ror   UNC   fun   internet   fail   http   utf8   amp   cti   

asyncio模块:示例一

import asyncio


@asyncio.coroutine
def func1():
    print(before...func1......)
    yield from asyncio.sleep(5)
    print(end...func1......)


tasks = [func1(), func1()]

loop = asyncio.get_event_loop()
loop.run_until_complete(asyncio.gather(*tasks))
loop.close()

asyncio模块:示例二

import asyncio


@asyncio.coroutine
def fetch_async(host, url=/):
    print(host, url)
    reader, writer = yield from asyncio.open_connection(host, 80)

    request_header_content = """GET %s HTTP/1.0\r\nHost: %s\r\n\r\n""" % (url, host,)
    request_header_content = bytes(request_header_content, encoding=utf-8)

    writer.write(request_header_content)
    yield from writer.drain()
    text = yield from reader.read()
    print(host, url, text)
    writer.close()

tasks = [
    fetch_async(www.cnblogs.com, /angelyan/),
    fetch_async(dig.chouti.com, /pic/show?nid=4073644713430508&lid=10273091)
]

loop = asyncio.get_event_loop()
results = loop.run_until_complete(asyncio.gather(*tasks))
loop.close()

 

asyncio模块+aiohttp模块:示例三

import aiohttp
import asyncio


@asyncio.coroutine
def fetch_async(url):
    print(url)
    response = yield from aiohttp.request(GET, url)
    # data = yield from response.read()
    # print(url, data)
    print(url, response)
    response.close()


tasks = [fetch_async(http://www.google.com/), fetch_async(http://www.chouti.com/)]

event_loop = asyncio.get_event_loop()
results = event_loop.run_until_complete(asyncio.gather(*tasks))
event_loop.close()

asyncio模块+requests模块:示例四

import asyncio
import requests


@asyncio.coroutine
def fetch_async(func, *args):
    loop = asyncio.get_event_loop()
    future = loop.run_in_executor(None, func, *args)
    response = yield from future
    print(response.url, response.content)


tasks = [
    fetch_async(requests.get, http://www.cnblogs.com/angelyan/),
    fetch_async(requests.get, http://dig.chouti.com/pic/show?nid=4073644713430508&lid=10273091)
]

loop = asyncio.get_event_loop()
results = loop.run_until_complete(asyncio.gather(*tasks))
loop.close()

gevent模块+requests模块:示例五

import gevent

import requests
from gevent import monkey

monkey.patch_all()


def fetch_async(method, url, req_kwargs):
    print(method, url, req_kwargs)
    response = requests.request(method=method, url=url, **req_kwargs)
    print(response.url, response.content)

# ##### 发送请求 #####
gevent.joinall([
    gevent.spawn(fetch_async, method=get, url=https://www.python.org/, req_kwargs={}),
    gevent.spawn(fetch_async, method=get, url=https://www.yahoo.com/, req_kwargs={}),
    gevent.spawn(fetch_async, method=get, url=https://github.com/, req_kwargs={}),
])

# ##### 发送请求(协程池控制最大协程数量) #####
# from gevent.pool import Pool
# pool = Pool(None)
# gevent.joinall([
#     pool.spawn(fetch_async, method=‘get‘, url=‘https://www.python.org/‘, req_kwargs={}),
#     pool.spawn(fetch_async, method=‘get‘, url=‘https://www.yahoo.com/‘, req_kwargs={}),
#     pool.spawn(fetch_async, method=‘get‘, url=‘https://www.github.com/‘, req_kwargs={}),
# ])

 

grequests模块:示例六

import grequests


request_list = [
    grequests.get(http://httpbin.org/delay/1, timeout=0.001),
    grequests.get(http://fakedomain/),
    grequests.get(http://httpbin.org/status/500)
]


# ##### 执行并获取响应列表 #####
# response_list = grequests.map(request_list)
# print(response_list)


# ##### 执行并获取响应列表(处理异常) #####
# def exception_handler(request, exception):
# print(request,exception)
#     print("Request failed")

# response_list = grequests.map(request_list, exception_handler=exception_handler)
# print(response_list)

twisted模块:示例七

from twisted.web.client import getPage, defer
from twisted.internet import reactor


def all_done(arg):
    reactor.stop()


def callback(contents):
    print(contents)


deferred_list = []

url_list = [http://www.bing.com, http://www.baidu.com, ]
for url in url_list:
    deferred = getPage(bytes(url, encoding=utf8))
    deferred.addCallback(callback)
    deferred_list.append(deferred)

dlist = defer.DeferredList(deferred_list)
dlist.addBoth(all_done)

reactor.run()

tornado模块:示例八

from tornado.httpclient import AsyncHTTPClient
from tornado.httpclient import HTTPRequest
from tornado import ioloop


def handle_response(response):
    """
    处理返回值内容(需要维护计数器,来停止IO循环),调用 ioloop.IOLoop.current().stop()
    :param response: 
    :return: 
    """
    if response.error:
        print("Error:", response.error)
    else:
        print(response.body)


def func():
    url_list = [
        http://www.baidu.com,
        http://www.bing.com,
    ]
    for url in url_list:
        print(url)
        http_client = AsyncHTTPClient()
        http_client.fetch(HTTPRequest(url), handle_response)


ioloop.IOLoop.current().add_callback(func)
ioloop.IOLoop.current().start()

twisted模块:示例九

from twisted.internet import reactor
from twisted.web.client import getPage
import urllib.parse


def one_done(arg):
    print(arg)
    reactor.stop()

post_data = urllib.parse.urlencode({check_data: adf})
post_data = bytes(post_data, encoding=utf8)
headers = {bContent-Type: bapplication/x-www-form-urlencoded}
response = getPage(bytes(http://dig.chouti.com/login, encoding=utf8),
                   method=bytes(POST, encoding=utf8),
                   postdata=post_data,
                   cookies={},
                   headers=headers)
response.addBoth(one_done)

reactor.run()

select模块:示例十

import select
import socket
import time


class AsyncTimeoutException(TimeoutError):
    """
    请求超时异常类
    """

    def __init__(self, msg):
        self.msg = msg
        super(AsyncTimeoutException, self).__init__(msg)


class HttpContext(object):
    """封装请求和相应的基本数据"""

    def __init__(self, sock, host, port, method, url, data, callback, timeout=5):
        """
        sock: 请求的客户端socket对象
        host: 请求的主机名
        port: 请求的端口
        port: 请求的端口
        method: 请求方式
        url: 请求的URL
        data: 请求时请求体中的数据
        callback: 请求完成后的回调函数
        timeout: 请求的超时时间
        """
        self.sock = sock
        self.callback = callback
        self.host = host
        self.port = port
        self.method = method
        self.url = url
        self.data = data

        self.timeout = timeout

        self.__start_time = time.time()
        self.__buffer = []

    def is_timeout(self):
        """当前请求是否已经超时"""
        current_time = time.time()
        if (self.__start_time + self.timeout) < current_time:
            return True

    def fileno(self):
        """请求sockect对象的文件描述符,用于select监听"""
        return self.sock.fileno()

    def write(self, data):
        """在buffer中写入响应内容"""
        self.__buffer.append(data)

    def finish(self, exc=None):
        """在buffer中写入响应内容完成,执行请求的回调函数"""
        if not exc:
            response = b‘‘.join(self.__buffer)
            self.callback(self, response, exc)
        else:
            self.callback(self, None, exc)

    def send_request_data(self):
        content = """%s %s HTTP/1.0\r\nHost: %s\r\n\r\n%s""" % (
            self.method.upper(), self.url, self.host, self.data,)

        return content.encode(encoding=utf8)


class AsyncRequest(object):
    def __init__(self):
        self.fds = []
        self.connections = []

    def add_request(self, host, port, method, url, data, callback, timeout):
        """创建一个要请求"""
        client = socket.socket()
        client.setblocking(False)
        try:
            client.connect((host, port))
        except BlockingIOError as e:
            pass
            # print(‘已经向远程发送连接的请求‘)
        req = HttpContext(client, host, port, method, url, data, callback, timeout)
        self.connections.append(req)
        self.fds.append(req)

    def check_conn_timeout(self):
        """检查所有的请求,是否有已经连接超时,如果有则终止"""
        timeout_list = []
        for context in self.connections:
            if context.is_timeout():
                timeout_list.append(context)
        for context in timeout_list:
            context.finish(AsyncTimeoutException(请求超时))
            self.fds.remove(context)
            self.connections.remove(context)

    def running(self):
        """事件循环,用于检测请求的socket是否已经就绪,从而执行相关操作"""
        while True:
            r, w, e = select.select(self.fds, self.connections, self.fds, 0.05)

            if not self.fds:
                return

            for context in r:
                sock = context.sock
                while True:
                    try:
                        data = sock.recv(8096)
                        if not data:
                            self.fds.remove(context)
                            context.finish()
                            break
                        else:
                            context.write(data)
                    except BlockingIOError as e:
                        break
                    except TimeoutError as e:
                        self.fds.remove(context)
                        self.connections.remove(context)
                        context.finish(e)
                        break

            for context in w:
                # 已经连接成功远程服务器,开始向远程发送请求数据
                if context in self.fds:
                    data = context.send_request_data()
                    context.sock.sendall(data)
                    self.connections.remove(context)

            self.check_conn_timeout()


if __name__ == __main__:
    def callback_func(context, response, ex):
        """
        :param context: HttpContext对象,内部封装了请求相关信息
        :param response: 请求响应内容
        :param ex: 是否出现异常(如果有异常则值为异常对象;否则值为None)
        :return:
        """
        print(context, response, ex)

    obj = AsyncRequest()
    url_list = [
        {host: www.google.com, port: 80, method: GET, url: /, data: ‘‘, timeout: 5,
         callback: callback_func},
        {host: www.baidu.com, port: 80, method: GET, url: /, data: ‘‘, timeout: 5,
         callback: callback_func},
        {host: www.bing.com, port: 80, method: GET, url: /, data: ‘‘, timeout: 5,
         callback: callback_func},
    ]
    for item in url_list:
        print(item)
        obj.add_request(**item)

    obj.running()

 

python的异步IO模块

标签:ror   UNC   fun   internet   fail   http   utf8   amp   cti   

原文地址:https://www.cnblogs.com/angelyan/p/10498112.html

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