264 lines
8.9 KiB
Python
264 lines
8.9 KiB
Python
#
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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#
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import optparse, sys, time, uuid
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import re, socket, select, errno
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from proton import Message
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# @todo stop the madness:
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import container as fusion_container
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import connection as fusion_connection
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import link as fusion_link
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"""
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This module implements a simple RPC server that can be used with the example
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RPC client. The client sends a 'method call'
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to the server, and waits for a response. The method call is a map of the form:
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{'method': '<name of method on server>',
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'args': {<map of name=value arguments for the call}
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}
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The server replies to the client using a map that contains a copy of the method
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map sent in the request.
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"""
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class SocketConnection(fusion_connection.ConnectionEventHandler):
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"""Associates a fusion Connection with a python network socket"""
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def __init__(self, name, socket, container, conn_properties):
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self.name = name
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self.socket = socket
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self.connection = container.create_connection(name, self,
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conn_properties)
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self.connection.user_context = self
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def fileno(self):
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"""Allows use of a SocketConnection in a select() call.
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"""
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return self.socket.fileno()
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# ConnectionEventHandler callbacks:
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def connection_active(self, connection):
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print "APP: CONN ACTIVE"
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def connection_closed(self, connection, reason):
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print "APP: CONN CLOSED"
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def link_pending(self, connection, link):
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print "APP: LINK PENDING"
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return True
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def sasl_done(self, connection, result):
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print "APP: SASL DONE"
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print result
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class MySenderLink(fusion_link.SenderEventHandler):
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"""
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"""
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def __init__(self, connection, link_handle, source_address,
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name):
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self.sender_link = connection.accept_sender(link_handle,
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source_address,
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self,
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name)
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# SenderEventHandler callbacks:
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def sender_active(self, sender_link):
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print "APP: SENDER ACTIVE"
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def sender_closed(self, sender_link, error):
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print "APP: SENDER CLOSED"
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class MyReceiverLink(fusion_link.ReceiverEventHandler):
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"""
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"""
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def __init__(self, connection, link_handle, target_address,
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name):
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self.receiver_link = connection.accept_receiver(link_handle,
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target_address,
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self,
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name)
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# ReceiverEventHandler callbacks:
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def receiver_active(self, receiver_link):
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print "APP: RECEIVER ACTIVE"
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def receiver_closed(self, receiver_link, error):
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print "APP: RECEIVER CLOSED"
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def message_received(self, receiver_link, message, handle):
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print "APP: MESSAGE RECEIVED"
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def send_callback(sender, handle, status, error=None):
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print "APP: MESSAGE SENT CALLBACK"
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def main(argv=None):
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_usage = """Usage: %prog [options]"""
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parser = optparse.OptionParser(usage=_usage)
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parser.add_option("-a", dest="address", type="string",
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default="amqp://0.0.0.0:5672",
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help="""The socket address this server will listen on
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[amqp://0.0.0.0:5672]""")
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opts, arguments = parser.parse_args(args=argv)
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# Create a socket connection to the server
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#
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regex = re.compile(r"^amqp://([a-zA-Z0-9.]+)(:([\d]+))?$")
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print("Listening on %s" % opts.address)
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x = regex.match(opts.address)
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if not x:
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raise Exception("Bad address syntax: %s" % opts.address)
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matches = x.groups()
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host = matches[0]
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port = int(matches[2]) if matches[2] else None
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addr = socket.getaddrinfo(host, port, socket.AF_INET, socket.SOCK_STREAM)
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if not addr:
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raise Exception("Could not translate address '%s'" % opts.address)
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my_socket = socket.socket(addr[0][0], addr[0][1], addr[0][2])
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my_socket.setblocking(0) # 0=non-blocking
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try:
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my_socket.bind((host, port))
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my_socket.listen(10)
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except socket.error, e:
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if e[0] != errno.EINPROGRESS:
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raise
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# create an AMQP container that will 'provide' the RPC service
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#
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container = fusion_container.Container("example RPC service")
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socket_connections = {} # indexed by name (uuid)
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while True:
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#
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# Poll for I/O & timers
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#
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readfd = [my_socket]
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writefd = []
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readers,writers,timers = container.need_processing()
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# map fusion Connections to my SocketConnections
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for c in readers:
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sc = c.user_context
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assert sc and isinstance(sc, SocketConnection)
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readfd.append(sc)
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for c in writers:
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sc = c.user_context
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assert sc and isinstance(sc, SocketConnection)
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writefd.append(sc)
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timeout = None
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if timers:
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deadline = timers[0].next_tick
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now = time.time()
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timeout = 0 if deadline <= now else deadline - now
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print("select start (t=%s)" % str(timeout))
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readable,writable,ignore = select.select(readfd,writefd,[],timeout)
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print("select return")
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for r in readable:
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if r is my_socket:
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# new inbound connection request
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client_socket, client_address = my_socket.accept()
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name = uuid.uuid4().hex
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assert name not in socket_connections
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socket_connections[name] = SocketConnection(name,
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client_socket,
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container, {})
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else:
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assert isinstance(r, SocketConnection)
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count = r.connection.needs_input
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if count > 0:
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try:
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sock_data = r.socket.recv(count)
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if sock_data:
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r.connection.process_input( sock_data )
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else:
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# closed?
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r.connection.close_input()
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except socket.timeout, e:
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raise # I don't expect this
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except socket.error, e:
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err = e.args[0]
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# ignore non-fatal errors
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if (err != errno.EAGAIN and
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err != errno.EWOULDBLOCK and
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err != errno.EINTR):
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# otherwise, unrecoverable:
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r.connection.close_input()
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raise
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except: # beats me...
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r.connection.close_input()
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raise
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r.connection.process(time.time())
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for t in timers:
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now = time.time()
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if t.next_tick > now:
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break
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t.process(now)
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for w in writable:
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assert isinstance(w, SocketConnection)
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data = w.connection.output_data()
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if data:
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try:
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rc = w.socket.send(data)
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if rc > 0:
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w.connection.output_written(rc)
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else:
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# else socket closed
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w.connection.close_output()
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except socket.timeout, e:
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raise # I don't expect this
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except socket.error, e:
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err = e.args[0]
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# ignore non-fatal errors
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if (err != errno.EAGAIN and
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err != errno.EWOULDBLOCK and
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err != errno.EINTR):
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# otherwise, unrecoverable
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w.connection.close_output()
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raise
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except: # beats me...
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w.connection.close_output()
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raise
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w.connection.process(time.time())
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print "How to close connections that are finished???"
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# Send replies
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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