336 lines
12 KiB
Python
336 lines
12 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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import fusion
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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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# Maps of outgoing and incoming links
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sender_links = {} # indexed by Source address
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receiver_links = {} # indexed by Target address
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class SocketConnection(fusion.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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self.connection.sasl.mechanisms("ANONYMOUS")
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self.connection.sasl.server()
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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 sender_requested(self, connection, link_handle,
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requested_source, properties):
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print "APP: SENDER LINK REQUESTED"
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global sender_links
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name = uuid.uuid4().hex
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# allow for requested_source address if it doesn't conflict with an
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# existing address
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if not requested_source or requested_source in sender_links:
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requested_source = "/%s/%s" % (connection.container.name,
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name)
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assert requested_source not in sender_links
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sender = MySenderLink(connection, link_handle, requested_source,
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name, {})
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sender_links[requested_source] = sender
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print "APP: NEW SENDER LINK CREATED, source=%s" % requested_source
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def receiver_requested(self, connection, link_handle,
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requested_target, properties):
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print "APP: RECEIVER LINK REQUESTED"
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# allow for requested_source address if it doesn't conflict with an
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# existing address
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global receiver_links
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name = uuid.uuid4().hex
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if not requested_target or requested_target in receiver_links:
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requested_target = "/%s/%s" % (connection.container.name,
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name)
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assert requested_target not in receiver_links
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receiver = MyReceiverLink(connection, link_handle,
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requested_target, name,
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{"capacity": 3})
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receiver_links[requested_target] = receiver
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print "APP: NEW RECEIVER LINK CREATED, target=%s" % requested_target
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# SASL callbacks:
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def sasl_step(self, connection, pn_sasl):
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print "SASL STEP"
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pn_sasl.done(pn_sasl.OK)
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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.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, properties):
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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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properties)
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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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# 'message sent' callback:
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def __call__(self, sender, handle, status, error=None):
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print "APP: MESSAGE SENT CALLBACK %s" % status
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class MyReceiverLink(fusion.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, properties):
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self._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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properties)
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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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global sender_links
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# extract to reply-to, correlation id
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reply_to = message.reply_to
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if not reply_to or reply_to not in sender_links:
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self._link.message_rejected(handle, "Bad reply-to address")
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else:
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my_sender = sender_links[reply_to]
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correlation_id = message.correlation_id
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method_map = message.body
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if (not isinstance(method_map, dict) or
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'method' not in method_map):
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self._link.message_rejected(handle, "Bad format")
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else:
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print "Echoing back message map"
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response = Message()
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response.address = reply_to
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response.subject = message.subject
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response.correlation_id = correlation_id
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response.body = {"response": method_map}
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link = my_sender.sender_link
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link.send( response, my_sender,
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message, time.time() + 5.0)
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self._link.message_accepted(handle)
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if self._link.capacity == 0:
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self._link.add_capacity( 5 )
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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 for inbound connections
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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("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 back 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 # 0 == next expiring timer
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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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return 0
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if __name__ == "__main__":
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sys.exit(main())
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