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authorLance Stout <lancestout@gmail.com>2012-02-02 18:27:23 +0100
committerLance Stout <lancestout@gmail.com>2012-02-02 18:27:23 +0100
commitbd52a5e6c12237e1ab4ceaf0d5933f3e5109800e (patch)
tree7097a2019b8535db8fc29b2a8a9f566b1ab3bd1e /sleekxmpp/plugins/xep_0047/stream.py
parentf98e5a03de19d6e4af6478b902789a50fc1a3b1c (diff)
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Initial, mostly working XEP-0047 plugin.
This is inspired by the version from macdiesel and tomstrummer, but their version was heavily linked with XEP-0096 and focused solely on file transfer. This version is a more generic implementation.
Diffstat (limited to 'sleekxmpp/plugins/xep_0047/stream.py')
-rw-r--r--sleekxmpp/plugins/xep_0047/stream.py137
1 files changed, 137 insertions, 0 deletions
diff --git a/sleekxmpp/plugins/xep_0047/stream.py b/sleekxmpp/plugins/xep_0047/stream.py
new file mode 100644
index 00000000..73c34425
--- /dev/null
+++ b/sleekxmpp/plugins/xep_0047/stream.py
@@ -0,0 +1,137 @@
+import socket
+import threading
+import logging
+try:
+ import queue
+except ImportError:
+ import Queue as queue
+
+from sleekxmpp.exceptions import XMPPError
+
+
+log = logging.getLogger(__name__)
+
+
+class IBBytestream(object):
+
+ def __init__(self, xmpp, sid, block_size, to, ifrom, window_size=1):
+ self.xmpp = xmpp
+ self.sid = sid
+ self.block_size = block_size
+ self.window_size = window_size
+
+ self.receiver = to
+ self.sender = ifrom
+
+ self.send_seq = -1
+ self.recv_seq = -1
+
+ self._send_seq_lock = threading.Lock()
+ self._recv_seq_lock = threading.Lock()
+
+ self.stream_started = threading.Event()
+ self.stream_in_closed = threading.Event()
+ self.stream_out_closed = threading.Event()
+
+ self.recv_queue = queue.Queue()
+
+ self.send_window = threading.BoundedSemaphore(value=self.window_size)
+ self.window_ids = set()
+ self.window_empty = threading.Event()
+ self.window_empty.set()
+
+ def send(self, data):
+ if not self.stream_started.is_set() or \
+ self.stream_out_closed.is_set():
+ raise socket.error
+ data = data[0:self.block_size]
+ self.send_window.acquire()
+ with self._send_seq_lock:
+ self.send_seq = (self.send_seq + 1) % 65535
+ seq = self.send_seq
+ iq = self.xmpp.Iq()
+ iq['type'] = 'set'
+ iq['to'] = self.receiver
+ iq['from'] = self.sender
+ iq['ibb_data']['sid'] = self.sid
+ iq['ibb_data']['seq'] = seq
+ iq['ibb_data']['data'] = data
+ self.window_empty.clear()
+ self.window_ids.add(iq['id'])
+ iq.send(block=False, callback=self._recv_ack)
+ return len(data)
+
+ def sendall(self, data):
+ sent_len = 0
+ while sent_len < len(data):
+ sent_len += self.send(data[sent_len:])
+
+ def _recv_ack(self, iq):
+ self.window_ids.remove(iq['id'])
+ if not self.window_ids:
+ self.window_empty.set()
+ self.send_window.release()
+ if iq['type'] == 'error':
+ self.close()
+
+ def _recv_data(self, iq):
+ with self._recv_seq_lock:
+ new_seq = iq['ibb_data']['seq']
+ if new_seq != (self.recv_seq + 1) % 65535:
+ self.close()
+ raise XMPPError('unexpected-request')
+ self.recv_seq = new_seq
+
+ data = iq['ibb_data']['data']
+ if len(data) > self.block_size:
+ self.close()
+ raise XMPPError('not-acceptable')
+
+ self.recv_queue.put(data)
+ self.xmpp.event('ibb_stream_data', {'stream': self, 'data': data})
+ iq.reply()
+ iq.send()
+
+ def recv(self, *args, **kwargs):
+ return self.read(block=True)
+
+ def read(self, block=True, timeout=None, **kwargs):
+ if not self.stream_started.is_set() or \
+ self.stream_in_closed.is_set():
+ raise socket.error
+ if timeout is not None:
+ block = True
+ try:
+ return self.recv_queue.get(block, timeout)
+ except:
+ return None
+
+ def close(self):
+ iq = self.xmpp.Iq()
+ iq['type'] = 'set'
+ iq['to'] = self.receiver
+ iq['from'] = self.sender
+ iq['ibb_close']['sid'] = self.sid
+ self.stream_out_closed.set()
+ iq.send(block=False,
+ callback=lambda x: self.stream_in_closed.set())
+ self.xmpp.event('ibb_stream_end', self)
+
+ def _closed(self, iq):
+ self.stream_in_closed.set()
+ self.stream_out_closed.set()
+ while not self.window_empty.is_set():
+ log.info('waiting for send window to empty')
+ self.window_empty.wait(timeout=1)
+ iq.reply()
+ iq.send()
+ self.xmpp.event('ibb_stream_end', self)
+
+ def makefile(self, *args, **kwargs):
+ return self
+
+ def connect(*args, **kwargs):
+ return None
+
+ def shutdown(self, *args, **kwargs):
+ return None