| # |
| # 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 |
| import sys |
| |
| 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 not data: |
| self.detach_all() |
| break |
| # If we have a security layer and it sends us no decoded data, |
| # that's OK as long as its return code is happy. |
| if self.security_layer_rx: |
| try: |
| data = self.security_layer_rx.decode(data) |
| except: |
| self.detach_all() |
| break |
| # When we do not use SSL transport, we get periodic |
| # spurious timeout events on the socket. When using SSL, |
| # these events show up as timeout *errors*. Both should be |
| # ignored unless we have aborted. |
| except socket.timeout: |
| if self.aborted(): |
| self.close_code = (None, "connection timed out") |
| self.detach_all() |
| break |
| else: |
| continue |
| except socket.error, e: |
| if self.aborted() or str(e) != "The read operation timed out": |
| self.close_code = (None, str(e)) |
| self.detach_all() |
| break |
| else: |
| continue |
| 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) |
