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+# Copyright 2011, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+# * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+# * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+"""Message related utilities.
+
+Note: request.connection.write/read are used in this module, even though
+mod_python document says that they should be used only in connection
+handlers. Unfortunately, we have no other options. For example,
+request.write/read are not suitable because they don't allow direct raw
+bytes writing/reading.
+"""
+
+from __future__ import absolute_import
+import six.moves.queue
+import threading
+
+# Export Exception symbols from msgutil for backward compatibility
+from mod_pywebsocket._stream_exceptions import ConnectionTerminatedException
+from mod_pywebsocket._stream_exceptions import InvalidFrameException
+from mod_pywebsocket._stream_exceptions import BadOperationException
+from mod_pywebsocket._stream_exceptions import UnsupportedFrameException
+
+
+# An API for handler to send/receive WebSocket messages.
+def close_connection(request):
+ """Close connection.
+
+ Args:
+ request: mod_python request.
+ """
+ request.ws_stream.close_connection()
+
+
+def send_message(request, payload_data, end=True, binary=False):
+ """Send a message (or part of a message).
+
+ Args:
+ request: mod_python request.
+ payload_data: unicode text or str binary to send.
+ end: True to terminate a message.
+ False to send payload_data as part of a message that is to be
+ terminated by next or later send_message call with end=True.
+ binary: send payload_data as binary frame(s).
+ Raises:
+ BadOperationException: when server already terminated.
+ """
+ request.ws_stream.send_message(payload_data, end, binary)
+
+
+def receive_message(request):
+ """Receive a WebSocket frame and return its payload as a text in
+ unicode or a binary in str.
+
+ Args:
+ request: mod_python request.
+ Raises:
+ InvalidFrameException: when client send invalid frame.
+ UnsupportedFrameException: when client send unsupported frame e.g. some
+ of reserved bit is set but no extension can
+ recognize it.
+ InvalidUTF8Exception: when client send a text frame containing any
+ invalid UTF-8 string.
+ ConnectionTerminatedException: when the connection is closed
+ unexpectedly.
+ BadOperationException: when client already terminated.
+ """
+ return request.ws_stream.receive_message()
+
+
+def send_ping(request, body):
+ request.ws_stream.send_ping(body)
+
+
+class MessageReceiver(threading.Thread):
+ """This class receives messages from the client.
+
+ This class provides three ways to receive messages: blocking,
+ non-blocking, and via callback. Callback has the highest precedence.
+
+ Note: This class should not be used with the standalone server for wss
+ because pyOpenSSL used by the server raises a fatal error if the socket
+ is accessed from multiple threads.
+ """
+ def __init__(self, request, onmessage=None):
+ """Construct an instance.
+
+ Args:
+ request: mod_python request.
+ onmessage: a function to be called when a message is received.
+ May be None. If not None, the function is called on
+ another thread. In that case, MessageReceiver.receive
+ and MessageReceiver.receive_nowait are useless
+ because they will never return any messages.
+ """
+
+ threading.Thread.__init__(self)
+ self._request = request
+ self._queue = six.moves.queue.Queue()
+ self._onmessage = onmessage
+ self._stop_requested = False
+ self.setDaemon(True)
+ self.start()
+
+ def run(self):
+ try:
+ while not self._stop_requested:
+ message = receive_message(self._request)
+ if self._onmessage:
+ self._onmessage(message)
+ else:
+ self._queue.put(message)
+ finally:
+ close_connection(self._request)
+
+ def receive(self):
+ """ Receive a message from the channel, blocking.
+
+ Returns:
+ message as a unicode string.
+ """
+ return self._queue.get()
+
+ def receive_nowait(self):
+ """ Receive a message from the channel, non-blocking.
+
+ Returns:
+ message as a unicode string if available. None otherwise.
+ """
+ try:
+ message = self._queue.get_nowait()
+ except six.moves.queue.Empty:
+ message = None
+ return message
+
+ def stop(self):
+ """Request to stop this instance.
+
+ The instance will be stopped after receiving the next message.
+ This method may not be very useful, but there is no clean way
+ in Python to forcefully stop a running thread.
+ """
+ self._stop_requested = True
+
+
+class MessageSender(threading.Thread):
+ """This class sends messages to the client.
+
+ This class provides both synchronous and asynchronous ways to send
+ messages.
+
+ Note: This class should not be used with the standalone server for wss
+ because pyOpenSSL used by the server raises a fatal error if the socket
+ is accessed from multiple threads.
+ """
+ def __init__(self, request):
+ """Construct an instance.
+
+ Args:
+ request: mod_python request.
+ """
+ threading.Thread.__init__(self)
+ self._request = request
+ self._queue = six.moves.queue.Queue()
+ self.setDaemon(True)
+ self.start()
+
+ def run(self):
+ while True:
+ message, condition = self._queue.get()
+ condition.acquire()
+ send_message(self._request, message)
+ condition.notify()
+ condition.release()
+
+ def send(self, message):
+ """Send a message, blocking."""
+
+ condition = threading.Condition()
+ condition.acquire()
+ self._queue.put((message, condition))
+ condition.wait()
+
+ def send_nowait(self, message):
+ """Send a message, non-blocking."""
+
+ self._queue.put((message, threading.Condition()))
+
+
+# vi:sts=4 sw=4 et