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�� �
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set_header�.��& �Sec-WebSocket-Version��7, 8, 13���.�� �WebSocketHandler.get�.�� �strip�.�� �settings�.�� �websocket_ping_interval�N��.��t �pThe interval for websocket keep-alive pings.
Set websocket_ping_interval = 0 to disable pings.
�.�� �websocket_ping_timeout�N��.��� ��If no ping is received in this many seconds,
close the websocket connection (VPNs, etc. can fail to cleanly close ws connections).
Default is max of 3 pings or 30 seconds.
�.�� �websocket_max_message_size�.�� �_default_max_message_size�.��� ��Maximum allowed message size.
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�.�� �
is_closing�.�� �WebSocketClosedError�.�� �tornado�.��
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write_message�.�� �binary���.��O XH Sends the given message to the client of this Web Socket.
The message may be either a string or a dict (which will be
encoded as json). If the ``binary`` argument is false, the
message will be sent as utf8; in binary mode any byte string
is allowed.
If the connection is already closed, raises `WebSocketClosedError`.
Returns a `.Future` which can be used for flow control.
.. versionchanged:: 3.2
`WebSocketClosedError` was added (previously a closed connection
would raise an `AttributeError`)
.. versionchanged:: 4.3
Returns a `.Future` which can be used for flow control.
.. versionchanged:: 5.0
Consistently raises `WebSocketClosedError`. Previously could
sometimes raise `.StreamClosedError`.
�.�� �selected_subprotocol�.��] �YThe subprotocol returned by `select_subprotocol`.
.. versionadded:: 5.1
�.��� ��Handle incoming messages on the WebSocket
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.. versionchanged:: 4.5
``on_message`` can be a coroutine.
�.�� �utf8�.�� �
write_ping�.��� X� Send ping frame to the remote end.
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bytes) to be sent as a part of the ping message. Note that not
all websocket implementations expose this data to
applications.
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setting instead of sending pings manually.
.. versionchanged:: 5.1
The data argument is now optional.
�.�� �close�.��J XC Closes this Web Socket.
Once the close handshake is successful the socket will be closed.
``code`` may be a numeric status code, taken from the values
defined in `RFC 6455 section 7.4.1
<https://tools.ietf.org/html/rfc6455#section-7.4.1>`_.
``reason`` may be a textual message about why the connection is
closing. These values are made available to the client, but are
not otherwise interpreted by the websocket protocol.
.. versionchanged:: 4.0
Added the ``code`` and ``reason`` arguments.
�.�� �urlparse�.��
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�Host���.��� X� Override to enable support for allowing alternate origins.
The ``origin`` argument is the value of the ``Origin`` HTTP
header, the url responsible for initiating this request. This
method is not called for clients that do not send this header;
such requests are always allowed (because all browsers that
implement WebSockets support this header, and non-browser
clients do not have the same cross-site security concerns).
Should return ``True`` to accept the request or ``False`` to
reject it. By default, rejects all requests with an origin on
a host other than this one.
This is a security protection against cross site scripting attacks on
browsers, since WebSockets are allowed to bypass the usual same-origin
policies and don't use CORS headers.
.. warning::
This is an important security measure; don't disable it
without understanding the security implications. In
particular, if your authentication is cookie-based, you
must either restrict the origins allowed by
``check_origin()`` or implement your own XSRF-like
protection for websocket connections. See `these
<https://www.christian-schneider.net/CrossSiteWebSocketHijacking.html>`_
`articles
<https://devcenter.heroku.com/articles/websocket-security>`_
for more.
To accept all cross-origin traffic (which was the default prior to
Tornado 4.0), simply override this method to always return ``True``::
def check_origin(self, origin):
return True
To allow connections from any subdomain of your site, you might
do something like::
def check_origin(self, origin):
parsed_origin = urllib.parse.urlparse(origin)
return parsed_origin.netloc.endswith(".mydomain.com")
.. versionadded:: 4.0
�.�� � set_nodelay�.��8 X1 Set the no-delay flag for this stream.
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due to the interaction between Nagle's algorithm and TCP delayed
ACKs. To reduce this delay (at the expense of possibly increasing
bandwidth usage), call ``self.set_nodelay(True)`` once the websocket
connection is established.
See `.BaseIOStream.set_nodelay` for additional details.
.. versionadded:: 3.1
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decompress�.�� C ���.�� �unconsumed_tail�.�� �_DecompressTooLargeError�.�� �WebSocketProtocol�.�� �
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� last_pong�.�� �_selected_subprotocol�.�� �_handle_websocket_headers�.��' �!Missing/Invalid WebSocket headers���.�� �_accept_connection�.�� �asyncio�.�� �CancelledError�.��+ �$Malformed WebSocket request received����.�� h|��.��) �%WebSocketProtocol13.accept_connection�.��C �?WebSocketProtocol13._handle_websocket_headers.<locals>.<lambda>�.��6 �Host��Sec-Websocket-Key��Sec-Websocket-Version���.��% �!Missing/Invalid WebSocket headers�.��� ��Verifies all invariant- and required headers
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�.�� �hashlib�.�� �sha1�.��
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�.�� �compute_accept_value�.�� �cast�.�� �Sec-Websocket-Key���.�� �Sec-WebSocket-Protocol���.�� �select_subprotocol�.�� �Sec-WebSocket-Protocol�.�� �_parse_extensions_header�.�� �permessage-deflate�.�� �_create_compressors�.��
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start_pinging�.�� �open�.��* �&WebSocketProtocol13._accept_connection�.�� �Sec-WebSocket-Extensions�h��.�� �
_parse_header�.�� �Upgrade�.�� �
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�client�.�� �unsupported extension %r�.�� �Sec-WebSocket-Protocol�N��.��� ��Process the headers sent by the server to this client connection.
'key' is the websocket handshake challenge/response key.
�.�� �
persistent�.�� �_no_context_takeover�.�� �_max_window_bits�.��
� max_wbits�.�� �options�.��p �lConverts a websocket agreed_parameters set to keyword arguments
for our compressor objects.
�.��q ��(�server_no_context_takeover��client_no_context_takeover��server_max_window_bits��client_max_window_bits��.��( �$unsupported compression parameter %r�.�� � _PerMessageDeflateCompressor�.�� �_get_compressor_options�.��" � _PerMessageDeflateDecompressor�.��( �$control frames may not be fragmented�.��3 �/control frame payloads may not exceed 125 bytes�.�� �FIN�.��
�struct�.�� �pack�.�� �B�.�K�.�� �!BH�.�K~.�� �!BQ�.�K.�� �os�.�� �urandom�.�� K��.�� �_websocket_mask�.�� �data�.�� �write�.�K.�� �RSV1�.�� � _write_frame�.�� �message�.�� �flags���.�� �StreamClosedError�.�� }��return�Ns.�� �wrapper�.��6 �2WebSocketProtocol13.write_message.<locals>.wrapper�.�� �
ensure_future�.��= �9Sends the given message to the client of this Web Socket.�.�� �fut�.�K .�� �Send ping frame.�.�� �_receive_frame�.�� �on_ws_connection_close�.��+ �'WebSocketProtocol13._receive_frame_loop�.�� �
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�unpack�.�� �BB�.��* �&too many values to unpack (expected 2)�.�� �RSV_MASK�.�� � OPCODE_MASK�.�� �!H�.�� K��.�� �!Q�.�� M��message too big���.�� �_handle_message�.��
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on_message�.�� �>H�.�� h�NKN��R�.�� �
to_unicode�.�� h�KNN��R�.�K
.�� �on_ping�.��
�IOLoop�.�� �current�.�� �time�.�� �on_pong�.��B �>Execute on_message, returning its Future if it is a coroutine.�.��
�closed�.�� M�.�� C �.�� �remove_timeout�.�� � add_timeout�.�K.�� �stop�.��$ � Closes the WebSocket connection.�.��� ��Return ``True`` if this connection is closing.
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initiated its closing handshake or if the stream has been
shut down uncleanly.
�.�� �max�.�K.�K .�� �PeriodicCallback�.�� �
periodic_ping�.�� �start�.��= �9Start sending periodic pings to keep the connection alive�.�� jZ ��.��� ��Send a ping to keep the websocket alive
Called periodically if the websocket_ping_interval is set and non-zero.
�.��
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read_queue�.�� K��.�� �key�.�� �_on_message_callback�.�� �url�.��
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tcp_client�.��8 �4WebSocketClientConnection.__init__.<locals>.<lambda>�.�� �_on_http_response�.�� J @.�� J .�� �protocol�.��� ��Closes the websocket connection.
``code`` and ``reason`` are documented under
`WebSocketHandler.close`.
.. versionadded:: 3.2
.. versionchanged:: 4.0
Added the ``code`` and ``reason`` arguments.
�.�� �done�.�� �
set_exception�.�� � _on_message�.�� N��.�� �error�.�� �WebSocketError�.�� �Non-websocket response���.�� �
start_line�.�� �ResponseStartLine�.�� �code�.�� �headers_received�.�� �_timeout�.�� �_process_server_headers�.�� �
connection�.�� � add_callback�.�� �final_callback�.��& �"future_set_result_unless_cancelled�.��. �*WebSocketClientConnection.headers_received�.��' �!Client connection has been closed���.��Q XJ Sends a message to the WebSocket server.
If the stream is closed, raises `WebSocketClosedError`.
Returns a `.Future` which can be used for flow control.
.. versionchanged:: 5.0
Exception raised on a closed stream changed from `.StreamClosedError`
to `WebSocketClosedError`.
�.��
� awaitable�.�� Xx Reads a message from the WebSocket server.
If on_message_callback was specified at WebSocket
initialization, this function will never return messages
Returns a future whose result is the message, or None
if the connection is closed. If a callback argument
is given it will be called with the future when it is
ready.
�.�� �put�.��� X� Send ping frame to the remote end.
The data argument allows a small amount of data (up to 125
bytes) to be sent as a part of the ping message. Note that not
all websocket implementations expose this data to
applications.
Consider using the ``ping_interval`` argument to
`websocket_connect` instead of sending pings manually.
.. versionadded:: 5.1
�.�� h�h���.��S �OThe subprotocol selected by the server.
.. versionadded:: 5.1
�.�� �app_log�.�� �Uncaught exception %s�.�� �
httpclient�.�� � HTTPRequest�.�� � HTTPHeaders�.�� �connect_timeout���.�� �
_RequestProxy�.��
� _DEFAULTS�.�� �WebSocketClientConnection�.��1 (�on_message_callback�hh hh� subprotocols�t�.�� �conn�.��# X Client-side websocket support.
Takes a url and returns a Future whose result is a
`WebSocketClientConnection`.
``compression_options`` is interpreted in the same way as the
return value of `.WebSocketHandler.get_compression_options`.
The connection supports two styles of operation. In the coroutine
style, the application typically calls
`~.WebSocketClientConnection.read_message` in a loop::
conn = yield websocket_connect(url)
while True:
msg = yield conn.read_message()
if msg is None: break
# Do something with msg
In the callback style, pass an ``on_message_callback`` to
``websocket_connect``. In both styles, a message of ``None``
indicates that the connection has been closed.
``subprotocols`` may be a list of strings specifying proposed
subprotocols. The selected protocol may be found on the
``selected_subprotocol`` attribute of the connection object
when the connection is complete.
.. versionchanged:: 3.2
Also accepts ``HTTPRequest`` objects in place of urls.
.. versionchanged:: 4.1
Added ``compression_options`` and ``on_message_callback``.
.. versionchanged:: 4.5
Added the ``ping_interval``, ``ping_timeout``, and ``max_message_size``
arguments, which have the same meaning as in `WebSocketHandler`.
.. versionchanged:: 5.0
The ``io_loop`` argument (deprecated since version 4.1) has been removed.
.. versionchanged:: 5.1
Added the ``subprotocols`` argument.
�.��� X� Implementation of the WebSocket protocol.
`WebSockets <http://dev.w3.org/html5/websockets/>`_ allow for bidirectional
communication between the browser and server.
WebSockets are supported in the current versions of all major browsers,
although older versions that do not support WebSockets are still in use
(refer to http://caniuse.com/websockets for details).
This module implements the final version of the WebSocket protocol as
defined in `RFC 6455 <http://tools.ietf.org/html/rfc6455>`_. Certain
browser versions (notably Safari 5.x) implemented an earlier draft of
the protocol (known as "draft 76") and are not compatible with this module.
.. versionchanged:: 4.0
Removed support for the draft 76 protocol version.
�.�� �__doc__�.��? �;/usr/local/lib/python3.8/dist-packages/tornado/websocket.py�.�� �__file__�.�� �__spec__�.��
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__cached__�.�� �abc�.�� �tornado.escape�.�� � tornado.web�.�� � urllib.parse�.�� hV��.�� �tornado.concurrent�.��
jg j� ��.�� hQh�jP ��.�� h~j� h釔.�� �tornado.ioloop�.��
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TYPE_CHECKING�.�� �Any�.�� �Optional�.�� �Dict�.�� �Union�.�� �List�.��
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TracebackType�.�� J � .�� h�� Exception�����.��
� metaclass�.�� � __prepare__�.�� � __getitem__�.��2 �.%s.__prepare__() must return a mapping, not %s�.�� �__name__�.�� � <metaclass>�.�� �tornado.websocket�.�� �
__module__�.�� � __qualname__�.�� �__orig_bases__�.��P �LRaised by operations on a closed connection.
.. versionadded:: 3.2
�.�� h��object�����.�� �float�.�� �int�.�� �str�.�� j* .�� �_WebSocketParams.__init__�.�� �RequestHandler�.�� �WebSocketHandler�.��
X� Subclass this class to create a basic WebSocket handler.
Override `on_message` to handle incoming messages, and use
`write_message` to send messages to the client. You can also
override `open` and `on_close` to handle opened and closed
connections.
Custom upgrade response headers can be sent by overriding
`~tornado.web.RequestHandler.set_default_headers` or
`~tornado.web.RequestHandler.prepare`.
See http://dev.w3.org/html5/websockets/ for details on the
JavaScript interface. The protocol is specified at
http://tools.ietf.org/html/rfc6455.
Here is an example WebSocket handler that echos back all received messages
back to the client:
.. testcode::
class EchoWebSocket(tornado.websocket.WebSocketHandler):
def open(self):
print("WebSocket opened")
def on_message(self, message):
self.write_message(u"You said: " + message)
def on_close(self):
print("WebSocket closed")
.. testoutput::
:hide:
WebSockets are not standard HTTP connections. The "handshake" is
HTTP, but after the handshake, the protocol is
message-based. Consequently, most of the Tornado HTTP facilities
are not available in handlers of this type. The only communication
methods available to you are `write_message()`, `ping()`, and
`close()`. Likewise, your request handler class should implement
`open()` method rather than ``get()`` or ``post()``.
If you map the handler above to ``/websocket`` in your application, you can
invoke it in JavaScript with::
var ws = new WebSocket("ws://localhost:8888/websocket");
ws.onopen = function() {
ws.send("Hello, world");
};
ws.onmessage = function (evt) {
alert(evt.data);
};
This script pops up an alert box that says "You said: Hello, world".
Web browsers allow any site to open a websocket connection to any other,
instead of using the same-origin policy that governs other network
access from JavaScript. This can be surprising and is a potential
security hole, so since Tornado 4.0 `WebSocketHandler` requires
applications that wish to receive cross-origin websockets to opt in
by overriding the `~WebSocketHandler.check_origin` method (see that
method's docs for details). Failure to do so is the most likely
cause of 403 errors when making a websocket connection.
When using a secure websocket connection (``wss://``) with a self-signed
certificate, the connection from a browser may fail because it wants
to show the "accept this certificate" dialog but has nowhere to show it.
You must first visit a regular HTML page using the same certificate
to accept it before the websocket connection will succeed.
If the application setting ``websocket_ping_interval`` has a non-zero
value, a ping will be sent periodically, and the connection will be
closed if a response is not received before the ``websocket_ping_timeout``.
Messages larger than the ``websocket_max_message_size`` application setting
(default 10MiB) will not be accepted.
.. versionchanged:: 4.5
Added ``websocket_ping_interval``, ``websocket_ping_timeout``, and
``websocket_max_message_size``.
�.�� � application�.�� � Application�.�� �HTTPServerRequest�.�� �WebSocketHandler.__init__�.�� �property�.��" � WebSocketHandler.ping_interval�.��! � WebSocketHandler.ping_timeout�.��% �!WebSocketHandler.max_message_size�.�� ���.�� �bytes�.�hK.�� �bool�.�� � Future[None]�.��" � WebSocketHandler.write_message�.�� j� .��� X� Override to implement subprotocol negotiation.
``subprotocols`` is a list of strings identifying the
subprotocols proposed by the client. This method may be
overridden to return one of those strings to select it, or
``None`` to not select a subprotocol.
Failure to select a subprotocol does not automatically abort
the connection, although clients may close the connection if
none of their proposed subprotocols was selected.
The list may be empty, in which case this method must return
None. This method is always called exactly once even if no
subprotocols were proposed so that the handler can be advised
of this fact.
.. versionchanged:: 5.1
Previously, this method was called with a list containing
an empty string instead of an empty list if no subprotocols
were proposed by the client.
�.��' �#WebSocketHandler.select_subprotocol�.��) �%WebSocketHandler.selected_subprotocol�.��� X� Override to return compression options for the connection.
If this method returns None (the default), compression will
be disabled. If it returns a dict (even an empty one), it
will be enabled. The contents of the dict may be used to
control the following compression options:
``compression_level`` specifies the compression level.
``mem_level`` specifies the amount of memory used for the internal compression state.
These parameters are documented in details here:
https://docs.python.org/3.6/library/zlib.html#zlib.compressobj
.. versionadded:: 4.1
.. versionchanged:: 4.5
Added ``compression_level`` and ``mem_level``.
�.��, �(WebSocketHandler.get_compression_options�.��� X� Invoked when a new WebSocket is opened.
The arguments to `open` are extracted from the `tornado.web.URLSpec`
regular expression, just like the arguments to
`tornado.web.RequestHandler.get`.
`open` may be a coroutine. `on_message` will not be called until
`open` has returned.
.. versionchanged:: 5.1
``open`` may be a coroutine.
�.�� �WebSocketHandler.open�.�� �WebSocketHandler.on_message�.�� �ping�.�� �WebSocketHandler.ping�.��: �6Invoked when the response to a ping frame is received.�.�� �WebSocketHandler.on_pong�.��. �*Invoked when the a ping frame is received.�.�� �WebSocketHandler.on_ping�.��g X` Invoked when the WebSocket is closed.
If the connection was closed cleanly and a status code or reason
phrase was supplied, these values will be available as the attributes
``self.close_code`` and ``self.close_reason``.
.. versionchanged:: 4.0
Added ``close_code`` and ``close_reason`` attributes.
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