asyncore timeout

Question

简单的异步http客户端，挂起很长时间与不可用的网站。

例如，在站点www.evtur.ru上，它等待很长时间，10分钟或更长时间。

我找不到方法如何尽量减少超时，是否有可能在5秒内超时，例如?

# 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)

Answer 1

self.socket.settimeout(nn)

这似乎不适合我。

然而，asyncore.loop()有一个名为count的参数。下面是asyncore.loop()所做的伪代码:

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

所以如果你想要5秒，你需要做:

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

但不建议以这种方式工作。注意，如果有"事件"，你可能有超过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

Answer 2

您必须在调度程序套接字上设置超时。调用

后

self.create_socket(socket.AF_INET, socket.SOCK_STREAM)

你可以调用

self.socket.settimeout(nn)

设置套接字上的超时时间。