标签: asyncore

我正在使用asyncore来实现发布订阅.我理解使用twisted或ZMQ可能是一个更好的解决方案,但在这种情况下它需要是纯python.等待连接时,CPU使用率约为1%,一旦客户端连接CPU使用率跳转写入高达100%.即使客户端断开连接,它也不会降回.

我的服务器类:

class Host(asyncore.dispatcher):

    log = logging.getLogger('Host')

    def __init__(self, port=7655):
        asyncore.dispatcher.__init__(self)
        self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
        self.set_reuse_addr()
        self.bind(('0.0.0.0', port,))
        self.listen(5)
        self.clients = []

    def handle_accept(self):
        socket, addr = self.accept()
        self.log.info("Aceepted client at {0}:{1}".format(addr[0], addr[1]))
        self.clients.append(RemoteClient(self, socket, addr))

    def broadcast(self, message):
        self.log.info("Broadcasting message: {0}".format(message))
        for client in self.clients:
            client.message(message)

我的经纪人:

class RemoteClient(asyncore.dispatcher):

    log = logging.getLogger('Host')

    def __init__(self, host, socket, address):
        asyncore.dispatcher.__init__(self, socket)
        self.host = host
        self.outbox = collections.deque()

    def message(self, message):
        self.outbox.append(message)

    def handle_write(self):
        if not self.outbox:
            return
        message = self.outbox.popleft()
        if len(message) > …

我尝试用asyncore做简单的异步http客户端:这段代码工作正常,输出是(快速执行):

www.gmail.com  :  recv http code:  301
www.yandex.ru  :  recv http code:  200
www.python.org  :  recv http code:  200
www.google.ru  :  recv http code:  200
www.gravatar.com  :  recv http code:  302
www.com.com  :  recv http code:  302
www.yahoo.com  :  recv http code:  302
www.bom.com  :  recv http code:  301

但是,与我不存在主机的取消注释:

#c = AsyncHTTP('http://www.no-such-host.ru') #!this line breaks execution!

执行中断,代码挂起一段时间,输出部分数据并挂起,没有最后的数据输出:

connection error: [Errno -5] No address associated with hostname
www.gmail.com  :  recv http code:  301
www.yandex.ru  :  recv http code:  200
www.yahoo.com …

我在使用带有AF_UNIX套接字的asyncore时遇到了一些问题.这段代码

import asyncore, socket, os
class testselect(asyncore.dispatcher):

    path = '/tmp/mysocket'

    def __init__(self):

        asyncore.dispatcher.__init__(self)

        self.create_socket(socket.AF_UNIX, socket.SOCK_DGRAM)
        self.bind(self.path)
        self.buffer = 'buffer'

    def handle_connect(self):

        print 'handle_connect'
        pass

    def handle_close(self):
        print 'handle_close'
        if os.path.exists(self.path)       
             os.remove(self.path)
        self.close()

    def handle_read(self):
        print 'handle_read'
        print self.recv(8192)

    def writable(self):
        print 'writable'
        return (len(self.buffer) > 0)

    def handle_write(self):
        print 'handle_write'
        sent = self.send(self.buffer)
        self.buffer = self.buffer[sent:]


    client = testselect()
    asyncore.loop()

如果我执行代码

 $ python select_prova.py
 writable
 handle_connect
 handle_write
 handle_close
 $  

它立即退出,不等待读写.如果我改变代码以强制writable()方法总是返回False,它正确地等待输入,我可以像这样与socat通信

 $ socat readline UNIX:/tmp/mysocket

但只是为了阅读(逻辑上写不起作用,因为writable()返回False).我的代码中是否有错误,或者我无法使用asyncore/select()管理AF_UNIX套接字？

有两个文件:server.py和client.py,都是在asyncore.dispatcher的帮助下编写的

Server.py

import asyncore, socket

class Server(asyncore.dispatcher):
    def __init__(self, host, port):
        asyncore.dispatcher.__init__(self)
        self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
        self.bind(('', port))
        self.listen(1)
        print "Waiting for connection..."

    def handle_accept(self):
        socket, address = self.accept()
        print 'Connection by', address
        socket.send("Hello Server")

    def handle_read(self):
        print "Reading..."
        out_buffer = self.recv(1024)
        if not out_buffer:
            self.close()
        print out_buffer

    def handle_closed(self):
        print "Server: Connection Closed"
        self.close()

s = Server('0.0.0.0', 5007)
asyncore.loop()

Client.py

import asyncore, socket

class Client(asyncore.dispatcher):
    def __init__(self, host, port):
        asyncore.dispatcher.__init__(self)
        self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
        self.connect((host, port))
        print "Client Start..."

    def handle_close(self):
        print "Client: …

我想为某个项目构建一个自定义服务器，但我不知道和服务器之间有什么区别，什么更好用，以及为什么asyncoreasyncio