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#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#
import datatypes, session
from threading import Thread, Condition, RLock
from util import wait, notify
from codec010 import StringCodec
from framing import *
from session import Session
from generator import control_invoker
from exceptions import *
from logging import getLogger
import delegates, socket
class ChannelBusy(Exception): pass
class ChannelsBusy(Exception): pass
class SessionBusy(Exception): pass
class ConnectionFailed(Exception): pass
def client(*args, **kwargs):
return delegates.Client(*args, **kwargs)
def server(*args, **kwargs):
return delegates.Server(*args, **kwargs)
from framer import Framer
class Connection(Framer):
def __init__(self, sock, delegate=client, **args):
Framer.__init__(self, sock)
self.lock = RLock()
self.attached = {}
self.sessions = {}
self.condition = Condition()
# XXX: we should combine this into a single comprehensive state
# model (whatever that means)
self.opened = False
self.failed = False
self.closed = False
self.close_code = (None, "connection aborted")
self.thread = Thread(target=self.run)
self.thread.setDaemon(True)
self.channel_max = 65535
self.user_id = None
self.op_enc = OpEncoder()
self.seg_enc = SegmentEncoder()
self.frame_enc = FrameEncoder()
self.delegate = delegate(self, **args)
def attach(self, name, ch, delegate, force=False):
self.lock.acquire()
try:
ssn = self.attached.get(ch.id)
if ssn is not None:
if ssn.name != name:
raise ChannelBusy(ch, ssn)
else:
ssn = self.sessions.get(name)
if ssn is None:
ssn = Session(name, delegate=delegate)
self.sessions[name] = ssn
elif ssn.channel is not None:
if force:
del self.attached[ssn.channel.id]
ssn.channel = None
else:
raise SessionBusy(ssn)
self.attached[ch.id] = ssn
ssn.channel = ch
ch.session = ssn
return ssn
finally:
self.lock.release()
def detach(self, name, ch):
self.lock.acquire()
try:
self.attached.pop(ch.id, None)
ssn = self.sessions.pop(name, None)
if ssn is not None:
ssn.channel = None
ssn.closed()
return ssn
finally:
self.lock.release()
def __channel(self):
for i in xrange(1, self.channel_max):
if not self.attached.has_key(i):
return i
else:
raise ChannelsBusy()
def session(self, name, timeout=None, delegate=session.client):
self.lock.acquire()
try:
ch = Channel(self, self.__channel())
ssn = self.attach(name, ch, delegate)
ssn.channel.session_attach(name)
if wait(ssn.condition, lambda: ssn.channel is not None, timeout):
return ssn
else:
self.detach(name, ch)
raise Timeout()
finally:
self.lock.release()
def detach_all(self):
self.lock.acquire()
self.failed = True
try:
for ssn in self.attached.values():
if self.close_code[0] != 200:
ssn.exceptions.append(self.close_code)
self.detach(ssn.name, ssn.channel)
finally:
self.lock.release()
def start(self, timeout=None):
self.delegate.start()
self.thread.start()
if not wait(self.condition, lambda: self.opened or self.failed, timeout):
self.thread.join()
raise Timeout()
if self.failed:
self.thread.join()
raise ConnectionFailed(*self.close_code)
def run(self):
frame_dec = FrameDecoder()
seg_dec = SegmentDecoder()
op_dec = OpDecoder()
while not self.closed:
try:
data = self.sock.recv(64*1024)
if self.security_layer_rx and data:
status, data = self.security_layer_rx.decode(data)
if not data:
self.detach_all()
break
except socket.timeout:
if self.aborted():
self.close_code = (None, "connection timed out")
self.detach_all()
break
else:
continue
except socket.error, e:
self.close_code = (None, str(e))
self.detach_all()
break
frame_dec.write(data)
seg_dec.write(*frame_dec.read())
op_dec.write(*seg_dec.read())
for op in op_dec.read():
try:
self.delegate.received(op)
except Closed, e:
self.close_code = (None, str(e))
if not self.opened:
self.failed = True
self.closed = True
notify(self.condition)
self.sock.close()
def write_op(self, op):
self.sock_lock.acquire()
try:
self.op_enc.write(op)
self.seg_enc.write(*self.op_enc.read())
self.frame_enc.write(*self.seg_enc.read())
bytes = self.frame_enc.read()
self.write(bytes)
self.flush()
finally:
self.sock_lock.release()
def close(self, timeout=None):
if not self.opened: return
Channel(self, 0).connection_close(200)
if not wait(self.condition, lambda: not self.opened, timeout):
raise Timeout()
self.thread.join(timeout=timeout)
def __str__(self):
return "%s:%s" % self.sock.getsockname()
def __repr__(self):
return str(self)
log = getLogger("qpid.io.ctl")
class Channel(control_invoker()):
def __init__(self, connection, id):
self.connection = connection
self.id = id
self.session = None
def invoke(self, op, args, kwargs):
ctl = op(*args, **kwargs)
ctl.channel = self.id
self.connection.write_op(ctl)
log.debug("SENT %s", ctl)
def __str__(self):
return "%s[%s]" % (self.connection, self.id)
def __repr__(self):
return str(self)
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