python – asyncore超时

发布时间：2020-12-20 13:25:52 所属栏目：Python 来源：网络整理

导读：简单的异步http客户端,很长时间没有可用的站点. 例如,在网站www.evtur.ru它等待很长时间,十分钟或更长时间. 我找不到如何最小化超时的方法,例如可以在5秒内执行超时吗？ # coding=utf-8import asyncoreimport string,socketimport StringIOimport mimetools,

简单的异步http客户端,很长时间没有可用的站点.

例如,在网站www.evtur.ru它等待很长时间,十分钟或更长时间.

我找不到如何最小化超时的方法,例如可以在5秒内执行超时吗？

# coding=utf-8
import asyncore
import string,socket
import StringIO
import mimetools,urlparse

class AsyncHTTP(asyncore.dispatcher):
    # HTTP requestor

    def __init__(self,uri):
        asyncore.dispatcher.__init__(self)

        self.uri = uri


        # turn the uri into a valid request
        scheme,host,path,params,query,fragment = urlparse.urlparse(uri)
        assert scheme == "http","only supports HTTP requests"
        try:
            host,port = string.split(host,":",1)
            port = int(port)
        except (TypeError,ValueError):
            port = 80 # default port
        if not path:
            path = "/"
        if params:
            path = path + ";" + params
        if query:
            path = path + "?" + query

        self.request = "GET %s HTTP/1.0rnHost: %srnrn" % (path,host)

        self.host = host
        self.port = port

        self.status = None
        self.header = None
        self.http_code = None
        self.data = ""

        # get things going!
        self.create_socket(socket.AF_INET,socket.SOCK_STREAM)
        #self.connect((host,port))
        #return
        try:
            self.connect((host,port))
        except Exception,e:
            self.close()
            self.handle_connect_expt(e)

    def handle_connect(self):
        self.send(self.request)

    def handle_expt(self):
        print "handle_expt error!"
        self.close()

    def handle_error(self):
        print "handle_error error!"
        self.close()

    def handle_connect_expt(self,expt):
        print "connection error:",expt

    def handle_code(self):        
        print self.host," : ","recv http code: ",self.http_code


    def handle_read(self):
        data = self.recv(2048)
        #print data
        if not self.header:
            self.data = self.data + data
            try:
                i = string.index(self.data,"rnrn")
            except ValueError:
                return # continue
            else:
                # parse header
                fp = StringIO.StringIO(self.data[:i+4])
                # status line is "HTTP/version status message"
                status = fp.readline()
                self.status = string.split(status," ",2)
                self.http_code = self.status[1]
                self.handle_code()      

                # followed by a rfc822-style message header
                self.header = mimetools.Message(fp)
                # followed by a newline,and the payload (if any)
                data = self.data[i+4:]
                self.data = ""
                #header recived
                #self.close()


    def handle_close(self):
        self.close()



c = AsyncHTTP('http://www.python.org')
c = AsyncHTTP('http://www.evtur.ru')
asyncore.loop(timeout=0.05)

解决方法

self.socket.settimeout(nn)

这似乎不适合我.

但是,asyncore.loop()具有名为count的参数.这里是伪代码asyncore.loop()在做什么：

for i in range(count):
    ...
    select(...,timeout)
    ...

所以如果你想要5秒钟,你需要做：

asyncore.loop(timeout=1,count=5)

但不建议以这种方式工作.请注意,如果存在“事件”,则可能有超过5个“计数”.我使用以下代码：

start = int(time.time())

while True:
    asyncore.loop(timeout=1,count=5)
    print "LOOP : %d enqueued,waiting to finish" % len(asyncore.socket_map)

    if len(asyncore.socket_map) == 0 :
        break

    if int(time.time()) - start > timeout :
        print "LOOP : Timeout"
        break

（编辑：李大同）

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