1061 lines
34 KiB
Python
1061 lines
34 KiB
Python
"""
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websocket - WebSocket client library for Python
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Copyright (C) 2010 Hiroki Ohtani(liris)
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""
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from __future__ import print_function
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import six
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import socket
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try:
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import ssl
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from ssl import SSLError
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if hasattr(ssl, "match_hostname"):
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from ssl import match_hostname
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else:
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from backports.ssl_match_hostname import match_hostname
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HAVE_SSL = True
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except ImportError:
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# dummy class of SSLError for ssl none-support environment.
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class SSLError(Exception):
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pass
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HAVE_SSL = False
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from six.moves.urllib.parse import urlparse
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import os
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import array
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import struct
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import uuid
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import hashlib
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import base64
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import threading
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import time
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import logging
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import traceback
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import sys
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import select
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"""
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websocket python client.
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=========================
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This version support only hybi-13.
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Please see http://tools.ietf.org/html/rfc6455 for protocol.
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"""
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# websocket supported version.
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VERSION = 13
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# closing frame status codes.
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STATUS_NORMAL = 1000
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STATUS_GOING_AWAY = 1001
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STATUS_PROTOCOL_ERROR = 1002
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STATUS_UNSUPPORTED_DATA_TYPE = 1003
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STATUS_STATUS_NOT_AVAILABLE = 1005
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STATUS_ABNORMAL_CLOSED = 1006
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STATUS_INVALID_PAYLOAD = 1007
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STATUS_POLICY_VIOLATION = 1008
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STATUS_MESSAGE_TOO_BIG = 1009
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STATUS_INVALID_EXTENSION = 1010
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STATUS_UNEXPECTED_CONDITION = 1011
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STATUS_TLS_HANDSHAKE_ERROR = 1015
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DEFAULT_SOCKET_OPTION = [(socket.SOL_TCP, socket.TCP_NODELAY, 1),]
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if hasattr(socket, "SO_KEEPALIVE"):
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DEFAULT_SOCKET_OPTION.append((socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1))
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if hasattr(socket, "TCP_KEEPIDLE"):
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DEFAULT_SOCKET_OPTION.append((socket.SOL_TCP, socket.TCP_KEEPIDLE, 30))
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if hasattr(socket, "TCP_KEEPINTVL"):
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DEFAULT_SOCKET_OPTION.append((socket.SOL_TCP, socket.TCP_KEEPINTVL, 10))
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if hasattr(socket, "TCP_KEEPCNT"):
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DEFAULT_SOCKET_OPTION.append((socket.SOL_TCP, socket.TCP_KEEPCNT, 3))
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logger = logging.getLogger()
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class WebSocketException(Exception):
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"""
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websocket exeception class.
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"""
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pass
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class WebSocketConnectionClosedException(WebSocketException):
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"""
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If remote host closed the connection or some network error happened,
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this exception will be raised.
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"""
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pass
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class WebSocketTimeoutException(WebSocketException):
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"""
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WebSocketTimeoutException will be raised at socket timeout during read/write data.
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"""
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pass
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default_timeout = None
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traceEnabled = False
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def enableTrace(tracable):
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"""
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turn on/off the tracability.
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tracable: boolean value. if set True, tracability is enabled.
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"""
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global traceEnabled
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traceEnabled = tracable
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if tracable:
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if not logger.handlers:
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logger.addHandler(logging.StreamHandler())
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logger.setLevel(logging.DEBUG)
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def setdefaulttimeout(timeout):
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"""
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Set the global timeout setting to connect.
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timeout: default socket timeout time. This value is second.
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"""
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global default_timeout
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default_timeout = timeout
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def getdefaulttimeout():
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"""
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Return the global timeout setting(second) to connect.
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"""
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return default_timeout
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def _parse_url(url):
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"""
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parse url and the result is tuple of
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(hostname, port, resource path and the flag of secure mode)
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url: url string.
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"""
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if ":" not in url:
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raise ValueError("url is invalid")
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scheme, url = url.split(":", 1)
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parsed = urlparse(url, scheme="http")
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if parsed.hostname:
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hostname = parsed.hostname
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else:
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raise ValueError("hostname is invalid")
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port = 0
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if parsed.port:
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port = parsed.port
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is_secure = False
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if scheme == "ws":
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if not port:
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port = 80
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elif scheme == "wss":
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is_secure = True
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if not port:
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port = 443
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else:
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raise ValueError("scheme %s is invalid" % scheme)
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if parsed.path:
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resource = parsed.path
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else:
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resource = "/"
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if parsed.query:
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resource += "?" + parsed.query
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return (hostname, port, resource, is_secure)
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def create_connection(url, timeout=None, **options):
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"""
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connect to url and return websocket object.
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Connect to url and return the WebSocket object.
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Passing optional timeout parameter will set the timeout on the socket.
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If no timeout is supplied, the global default timeout setting returned by getdefauttimeout() is used.
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You can customize using 'options'.
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If you set "header" list object, you can set your own custom header.
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>>> conn = create_connection("ws://echo.websocket.org/",
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... header=["User-Agent: MyProgram",
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... "x-custom: header"])
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timeout: socket timeout time. This value is integer.
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if you set None for this value, it means "use default_timeout value"
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options: current support option is only "header".
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if you set header as dict value, the custom HTTP headers are added.
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"""
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sockopt = options.get("sockopt", [])
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sslopt = options.get("sslopt", {})
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fire_cont_frame = options.get("fire_cont_frame", False)
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websock = WebSocket(sockopt=sockopt, sslopt=sslopt, fire_cont_frame = fire_cont_frame)
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websock.settimeout(timeout if timeout is not None else default_timeout)
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websock.connect(url, **options)
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return websock
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_MAX_INTEGER = (1 << 32) -1
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_AVAILABLE_KEY_CHARS = list(range(0x21, 0x2f + 1)) + list(range(0x3a, 0x7e + 1))
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_MAX_CHAR_BYTE = (1<<8) -1
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# ref. Websocket gets an update, and it breaks stuff.
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# http://axod.blogspot.com/2010/06/websocket-gets-update-and-it-breaks.html
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def _create_sec_websocket_key():
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uid = uuid.uuid4()
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return base64.encodestring(uid.bytes).decode('utf-8').strip()
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_HEADERS_TO_CHECK = {
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"upgrade": "websocket",
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"connection": "upgrade",
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}
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class ABNF(object):
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"""
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ABNF frame class.
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see http://tools.ietf.org/html/rfc5234
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and http://tools.ietf.org/html/rfc6455#section-5.2
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"""
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# operation code values.
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OPCODE_CONT = 0x0
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OPCODE_TEXT = 0x1
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OPCODE_BINARY = 0x2
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OPCODE_CLOSE = 0x8
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OPCODE_PING = 0x9
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OPCODE_PONG = 0xa
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# available operation code value tuple
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OPCODES = (OPCODE_CONT, OPCODE_TEXT, OPCODE_BINARY, OPCODE_CLOSE,
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OPCODE_PING, OPCODE_PONG)
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# opcode human readable string
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OPCODE_MAP = {
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OPCODE_CONT: "cont",
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OPCODE_TEXT: "text",
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OPCODE_BINARY: "binary",
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OPCODE_CLOSE: "close",
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OPCODE_PING: "ping",
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OPCODE_PONG: "pong"
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}
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# data length threashold.
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LENGTH_7 = 0x7e
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LENGTH_16 = 1 << 16
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LENGTH_63 = 1 << 63
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def __init__(self, fin=0, rsv1=0, rsv2=0, rsv3=0,
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opcode=OPCODE_TEXT, mask=1, data=""):
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"""
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Constructor for ABNF.
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please check RFC for arguments.
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"""
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self.fin = fin
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self.rsv1 = rsv1
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self.rsv2 = rsv2
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self.rsv3 = rsv3
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self.opcode = opcode
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self.mask = mask
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self.data = data
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self.get_mask_key = os.urandom
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def __str__(self):
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return "fin=" + str(self.fin) \
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+ " opcode=" + str(self.opcode) \
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+ " data=" + str(self.data)
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@staticmethod
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def create_frame(data, opcode, fin=1):
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"""
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create frame to send text, binary and other data.
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data: data to send. This is string value(byte array).
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if opcode is OPCODE_TEXT and this value is uniocde,
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data value is conveted into unicode string, automatically.
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opcode: operation code. please see OPCODE_XXX.
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fin: fin flag. if set to 0, create continue fragmentation.
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"""
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if opcode == ABNF.OPCODE_TEXT and isinstance(data, six.text_type):
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data = data.encode("utf-8")
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# mask must be set if send data from client
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return ABNF(fin, 0, 0, 0, opcode, 1, data)
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def format(self):
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"""
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format this object to string(byte array) to send data to server.
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"""
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if any(x not in (0, 1) for x in [self.fin, self.rsv1, self.rsv2, self.rsv3]):
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raise ValueError("not 0 or 1")
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if self.opcode not in ABNF.OPCODES:
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raise ValueError("Invalid OPCODE")
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length = len(self.data)
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if length >= ABNF.LENGTH_63:
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raise ValueError("data is too long")
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frame_header = chr(self.fin << 7
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| self.rsv1 << 6 | self.rsv2 << 5 | self.rsv3 << 4
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| self.opcode)
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if length < ABNF.LENGTH_7:
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frame_header += chr(self.mask << 7 | length)
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elif length < ABNF.LENGTH_16:
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frame_header += chr(self.mask << 7 | 0x7e)
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frame_header += struct.pack("!H", length)
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else:
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frame_header += chr(self.mask << 7 | 0x7f)
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frame_header += struct.pack("!Q", length)
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frame_header = six.b(frame_header)
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if not self.mask:
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return frame_header + self.data
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else:
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mask_key = self.get_mask_key(4)
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return frame_header + self._get_masked(mask_key)
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def _get_masked(self, mask_key):
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s = ABNF.mask(mask_key, self.data)
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if isinstance(mask_key, six.text_type):
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mask_key = mask_key.encode('utf-8')
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return mask_key + s
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@staticmethod
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def mask(mask_key, data):
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"""
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mask or unmask data. Just do xor for each byte
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mask_key: 4 byte string(byte).
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data: data to mask/unmask.
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"""
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if isinstance(mask_key, six.text_type):
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mask_key = six.b(mask_key)
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if isinstance(data, six.text_type):
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data = six.b(data)
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_m = array.array("B", mask_key)
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_d = array.array("B", data)
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for i in range(len(_d)):
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_d[i] ^= _m[i % 4]
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return _d.tostring()
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class WebSocket(object):
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"""
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Low level WebSocket interface.
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This class is based on
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The WebSocket protocol draft-hixie-thewebsocketprotocol-76
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http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-76
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We can connect to the websocket server and send/recieve data.
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The following example is a echo client.
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>>> import websocket
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>>> ws = websocket.WebSocket()
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>>> ws.connect("ws://echo.websocket.org")
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>>> ws.send("Hello, Server")
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>>> ws.recv()
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'Hello, Server'
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>>> ws.close()
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get_mask_key: a callable to produce new mask keys, see the set_mask_key
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function's docstring for more details
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sockopt: values for socket.setsockopt.
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sockopt must be tuple and each element is argument of sock.setscokopt.
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sslopt: dict object for ssl socket option.
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fire_cont_frame: fire recv event for each cont frame. default is False
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"""
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def __init__(self, get_mask_key=None, sockopt=None, sslopt=None,
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fire_cont_frame=False):
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"""
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Initalize WebSocket object.
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"""
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if sockopt is None:
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sockopt = []
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if sslopt is None:
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sslopt = {}
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self.connected = False
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self.sock = socket.socket()
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for opts in DEFAULT_SOCKET_OPTION:
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self.sock.setsockopt(*opts)
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for opts in sockopt:
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self.sock.setsockopt(*opts)
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self.sslopt = sslopt
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self.get_mask_key = get_mask_key
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self.fire_cont_frame = fire_cont_frame
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# Buffers over the packets from the layer beneath until desired amount
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# bytes of bytes are received.
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self._recv_buffer = []
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# These buffer over the build-up of a single frame.
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self._frame_header = None
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self._frame_length = None
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self._frame_mask = None
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self._cont_data = None
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|
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def fileno(self):
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return self.sock.fileno()
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|
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def set_mask_key(self, func):
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"""
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set function to create musk key. You can custumize mask key generator.
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Mainly, this is for testing purpose.
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func: callable object. the fuct must 1 argument as integer.
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The argument means length of mask key.
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This func must be return string(byte array),
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which length is argument specified.
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"""
|
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self.get_mask_key = func
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|
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def gettimeout(self):
|
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"""
|
|
Get the websocket timeout(second).
|
|
"""
|
|
return self.sock.gettimeout()
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|
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def settimeout(self, timeout):
|
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"""
|
|
Set the timeout to the websocket.
|
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|
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timeout: timeout time(second).
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|
"""
|
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self.sock.settimeout(timeout)
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|
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timeout = property(gettimeout, settimeout)
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|
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def connect(self, url, **options):
|
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"""
|
|
Connect to url. url is websocket url scheme. ie. ws://host:port/resource
|
|
You can customize using 'options'.
|
|
If you set "header" dict object, you can set your own custom header.
|
|
|
|
>>> ws = WebSocket()
|
|
>>> ws.connect("ws://echo.websocket.org/",
|
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... header={"User-Agent: MyProgram",
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... "x-custom: header"})
|
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|
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timeout: socket timeout time. This value is integer.
|
|
if you set None for this value,
|
|
it means "use default_timeout value"
|
|
|
|
options: current support option is only "header".
|
|
if you set header as dict value,
|
|
the custom HTTP headers are added.
|
|
|
|
"""
|
|
hostname, port, resource, is_secure = _parse_url(url)
|
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# TODO: we need to support proxy
|
|
self.sock.connect((hostname, port))
|
|
if is_secure:
|
|
if HAVE_SSL:
|
|
sslopt = dict(cert_reqs=ssl.CERT_REQUIRED,
|
|
ca_certs=os.path.join(os.path.dirname(__file__), "cacert.pem"))
|
|
sslopt.update(self.sslopt)
|
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self.sock = ssl.wrap_socket(self.sock, **sslopt)
|
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match_hostname(self.sock.getpeercert(), hostname)
|
|
else:
|
|
raise WebSocketException("SSL not available.")
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|
|
|
self._handshake(hostname, port, resource, **options)
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|
|
|
def _handshake(self, host, port, resource, **options):
|
|
headers = []
|
|
headers.append("GET %s HTTP/1.1" % resource)
|
|
headers.append("Upgrade: websocket")
|
|
headers.append("Connection: Upgrade")
|
|
if port == 80:
|
|
hostport = host
|
|
else:
|
|
hostport = "%s:%d" % (host, port)
|
|
headers.append("Host: %s" % hostport)
|
|
|
|
if "origin" in options:
|
|
headers.append("Origin: %s" % options["origin"])
|
|
else:
|
|
headers.append("Origin: http://%s" % hostport)
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|
|
key = _create_sec_websocket_key()
|
|
headers.append("Sec-WebSocket-Key: %s" % key)
|
|
headers.append("Sec-WebSocket-Version: %s" % VERSION)
|
|
if "header" in options:
|
|
headers.extend(options["header"])
|
|
|
|
headers.append("")
|
|
headers.append("")
|
|
|
|
header_str = "\r\n".join(headers)
|
|
self._send(header_str)
|
|
if traceEnabled:
|
|
logger.debug("--- request header ---")
|
|
logger.debug(header_str)
|
|
logger.debug("-----------------------")
|
|
|
|
status, resp_headers = self._read_headers()
|
|
if status != 101:
|
|
self.close()
|
|
raise WebSocketException("Handshake Status %d" % status)
|
|
|
|
success = self._validate_header(resp_headers, key)
|
|
if not success:
|
|
self.close()
|
|
raise WebSocketException("Invalid WebSocket Header")
|
|
|
|
self.connected = True
|
|
|
|
def _validate_header(self, headers, key):
|
|
for k, v in _HEADERS_TO_CHECK.items():
|
|
r = headers.get(k, None)
|
|
if not r:
|
|
return False
|
|
r = r.lower()
|
|
if v != r:
|
|
return False
|
|
|
|
result = headers.get("sec-websocket-accept", None)
|
|
if not result:
|
|
return False
|
|
result = result.lower()
|
|
|
|
if isinstance(result, six.text_type):
|
|
result = result.encode('utf-8')
|
|
|
|
value = (key + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11").encode('utf-8')
|
|
hashed = base64.encodestring(hashlib.sha1(value).digest()).strip().lower()
|
|
return hashed == result
|
|
|
|
def _read_headers(self):
|
|
status = None
|
|
headers = {}
|
|
if traceEnabled:
|
|
logger.debug("--- response header ---")
|
|
|
|
while True:
|
|
line = self._recv_line()
|
|
line = line.decode('utf-8')
|
|
if line == "\r\n" or line == "\n":
|
|
break
|
|
line = line.strip()
|
|
if traceEnabled:
|
|
logger.debug(line)
|
|
if not status:
|
|
status_info = line.split(" ", 2)
|
|
status = int(status_info[1])
|
|
else:
|
|
kv = line.split(":", 1)
|
|
if len(kv) == 2:
|
|
key, value = kv
|
|
headers[key.lower()] = value.strip().lower()
|
|
else:
|
|
raise WebSocketException("Invalid header")
|
|
|
|
if traceEnabled:
|
|
logger.debug("-----------------------")
|
|
|
|
return status, headers
|
|
|
|
def send(self, payload, opcode=ABNF.OPCODE_TEXT):
|
|
"""
|
|
Send the data as string.
|
|
|
|
payload: Payload must be utf-8 string or unicoce,
|
|
if the opcode is OPCODE_TEXT.
|
|
Otherwise, it must be string(byte array)
|
|
|
|
opcode: operation code to send. Please see OPCODE_XXX.
|
|
"""
|
|
|
|
frame = ABNF.create_frame(payload, opcode)
|
|
return self.send_frame(frame)
|
|
|
|
def send_frame(self, frame):
|
|
"""
|
|
Send the data frame.
|
|
|
|
frame: frame data created by ABNF.create_frame
|
|
|
|
>>> ws = create_connection("ws://echo.websocket.org/")
|
|
>>> frame = ABNF.create_frame("Hello", ABNF.OPCODE_TEXT)
|
|
>>> ws.send_frame(frame)
|
|
>>> cont_frame = ABNF.create_frame("My name is ", ABNF.OPCODE_CONT, 0)
|
|
>>> ws.send_frame(frame)
|
|
>>> cont_frame = ABNF.create_frame("Foo Bar", ABNF.OPCODE_CONT, 1)
|
|
>>> ws.send_frame(frame)
|
|
|
|
"""
|
|
if self.get_mask_key:
|
|
frame.get_mask_key = self.get_mask_key
|
|
data = frame.format()
|
|
length = len(data)
|
|
if traceEnabled:
|
|
logger.debug("send: " + repr(data))
|
|
while data:
|
|
l = self._send(data)
|
|
data = data[l:]
|
|
return length
|
|
|
|
|
|
def send_binary(self, payload):
|
|
return self.send(payload, ABNF.OPCODE_BINARY)
|
|
|
|
def ping(self, payload=""):
|
|
"""
|
|
send ping data.
|
|
|
|
payload: data payload to send server.
|
|
"""
|
|
self.send(payload, ABNF.OPCODE_PING)
|
|
|
|
def pong(self, payload):
|
|
"""
|
|
send pong data.
|
|
|
|
payload: data payload to send server.
|
|
"""
|
|
self.send(payload, ABNF.OPCODE_PONG)
|
|
|
|
def recv(self):
|
|
"""
|
|
Receive string data(byte array) from the server.
|
|
|
|
return value: string(byte array) value.
|
|
"""
|
|
opcode, data = self.recv_data()
|
|
if six.PY3 and opcode == ABNF.OPCODE_TEXT:
|
|
return data.decode("utf-8")
|
|
return data
|
|
|
|
def recv_data(self, control_frame=False):
|
|
"""
|
|
Recieve data with operation code.
|
|
|
|
control_frame: a boolean flag indicating whether to return control frame
|
|
data, defaults to False
|
|
|
|
return value: tuple of operation code and string(byte array) value.
|
|
"""
|
|
while True:
|
|
frame = self.recv_frame()
|
|
if not frame:
|
|
# handle error:
|
|
# 'NoneType' object has no attribute 'opcode'
|
|
raise WebSocketException("Not a valid frame %s" % frame)
|
|
elif frame.opcode in (ABNF.OPCODE_TEXT, ABNF.OPCODE_BINARY, ABNF.OPCODE_CONT):
|
|
if frame.opcode == ABNF.OPCODE_CONT and not self._cont_data:
|
|
raise WebSocketException("Illegal frame")
|
|
if self._cont_data:
|
|
self._cont_data[1] += frame.data
|
|
else:
|
|
self._cont_data = [frame.opcode, frame.data]
|
|
|
|
if frame.fin or self.fire_cont_frame:
|
|
data = self._cont_data
|
|
self._cont_data = None
|
|
return data
|
|
elif frame.opcode == ABNF.OPCODE_CLOSE:
|
|
self.send_close()
|
|
return (frame.opcode, frame.data)
|
|
elif frame.opcode == ABNF.OPCODE_PING:
|
|
self.pong(frame.data)
|
|
if control_frame:
|
|
return (frame.opcode, frame.data)
|
|
elif frame.opcode == ABNF.OPCODE_PONG:
|
|
if control_frame:
|
|
return (frame.opcode, frame.data)
|
|
|
|
def recv_data_frame(self, control_frame=False):
|
|
"""
|
|
Recieve data with operation code.
|
|
|
|
control_frame: a boolean flag indicating whether to return control frame
|
|
data, defaults to False
|
|
|
|
return value: tuple of operation code and string(byte array) value.
|
|
"""
|
|
while True:
|
|
frame = self.recv_frame()
|
|
if not frame:
|
|
# handle error:
|
|
# 'NoneType' object has no attribute 'opcode'
|
|
raise WebSocketException("Not a valid frame %s" % frame)
|
|
elif frame.opcode in (ABNF.OPCODE_TEXT, ABNF.OPCODE_BINARY, ABNF.OPCODE_CONT):
|
|
if frame.opcode == ABNF.OPCODE_CONT and not self._cont_data:
|
|
raise WebSocketException("Illegal frame")
|
|
if self._cont_data:
|
|
self._cont_data[1].data += frame.data
|
|
else:
|
|
self._cont_data = [frame.opcode, frame]
|
|
|
|
if frame.fin or self.fire_cont_frame:
|
|
data = self._cont_data
|
|
self._cont_data = None
|
|
return data
|
|
elif frame.opcode == ABNF.OPCODE_CLOSE:
|
|
self.send_close()
|
|
return (frame.opcode, frame)
|
|
elif frame.opcode == ABNF.OPCODE_PING:
|
|
self.pong(frame.data)
|
|
if control_frame:
|
|
return (frame.opcode, frame)
|
|
elif frame.opcode == ABNF.OPCODE_PONG:
|
|
if control_frame:
|
|
return (frame.opcode, frame)
|
|
|
|
def recv_frame(self):
|
|
"""
|
|
recieve data as frame from server.
|
|
|
|
return value: ABNF frame object.
|
|
"""
|
|
|
|
# Header
|
|
if self._frame_header is None:
|
|
self._frame_header = self._recv_strict(2)
|
|
|
|
b1 = self._frame_header[0]
|
|
|
|
if six.PY2:
|
|
b1 = ord(b1)
|
|
|
|
fin = b1 >> 7 & 1
|
|
rsv1 = b1 >> 6 & 1
|
|
rsv2 = b1 >> 5 & 1
|
|
rsv3 = b1 >> 4 & 1
|
|
opcode = b1 & 0xf
|
|
b2 = self._frame_header[1]
|
|
|
|
if six.PY2:
|
|
b2 = ord(b2)
|
|
|
|
has_mask = b2 >> 7 & 1
|
|
|
|
# Frame length
|
|
if self._frame_length is None:
|
|
length_bits = b2 & 0x7f
|
|
if length_bits == 0x7e:
|
|
length_data = self._recv_strict(2)
|
|
self._frame_length = struct.unpack("!H", length_data)[0]
|
|
elif length_bits == 0x7f:
|
|
length_data = self._recv_strict(8)
|
|
self._frame_length = struct.unpack("!Q", length_data)[0]
|
|
else:
|
|
self._frame_length = length_bits
|
|
|
|
# Mask
|
|
if self._frame_mask is None:
|
|
self._frame_mask = self._recv_strict(4) if has_mask else ""
|
|
|
|
# Payload
|
|
payload = self._recv_strict(self._frame_length)
|
|
if has_mask:
|
|
payload = ABNF.mask(self._frame_mask, payload)
|
|
|
|
# Reset for next frame
|
|
self._frame_header = None
|
|
self._frame_length = None
|
|
self._frame_mask = None
|
|
|
|
return ABNF(fin, rsv1, rsv2, rsv3, opcode, has_mask, payload)
|
|
|
|
|
|
def send_close(self, status=STATUS_NORMAL, reason=""):
|
|
"""
|
|
send close data to the server.
|
|
|
|
status: status code to send. see STATUS_XXX.
|
|
|
|
reason: the reason to close. This must be string.
|
|
"""
|
|
if status < 0 or status >= ABNF.LENGTH_16:
|
|
raise ValueError("code is invalid range")
|
|
self.send(struct.pack('!H', status) + reason, ABNF.OPCODE_CLOSE)
|
|
|
|
def close(self, status=STATUS_NORMAL, reason=""):
|
|
"""
|
|
Close Websocket object
|
|
|
|
status: status code to send. see STATUS_XXX.
|
|
|
|
reason: the reason to close. This must be string.
|
|
"""
|
|
if self.connected:
|
|
if status < 0 or status >= ABNF.LENGTH_16:
|
|
raise ValueError("code is invalid range")
|
|
|
|
try:
|
|
self.connected = False
|
|
self.send(struct.pack('!H', status) + reason, ABNF.OPCODE_CLOSE)
|
|
timeout = self.sock.gettimeout()
|
|
self.sock.settimeout(3)
|
|
try:
|
|
frame = self.recv_frame()
|
|
if logger.isEnabledFor(logging.ERROR):
|
|
recv_status = struct.unpack("!H", frame.data)[0]
|
|
if recv_status != STATUS_NORMAL:
|
|
logger.error("close status: " + repr(recv_status))
|
|
except:
|
|
pass
|
|
self.sock.settimeout(timeout)
|
|
self.sock.shutdown(socket.SHUT_RDWR)
|
|
except:
|
|
pass
|
|
self._closeInternal()
|
|
|
|
def _closeInternal(self):
|
|
self.sock.close()
|
|
|
|
def _send(self, data):
|
|
|
|
if isinstance(data, six.text_type):
|
|
data = data.encode('utf-8')
|
|
|
|
try:
|
|
return self.sock.send(data)
|
|
except socket.timeout as e:
|
|
message = getattr(e, 'strerror', getattr(e, 'message', ''))
|
|
raise WebSocketTimeoutException(message)
|
|
except Exception as e:
|
|
message = getattr(e, 'strerror', getattr(e, 'message', ''))
|
|
if "timed out" in message:
|
|
raise WebSocketTimeoutException(message)
|
|
else:
|
|
raise
|
|
|
|
def _recv(self, bufsize):
|
|
try:
|
|
bytes = self.sock.recv(bufsize)
|
|
except socket.timeout as e:
|
|
message = getattr(e, 'strerror', getattr(e, 'message', ''))
|
|
raise WebSocketTimeoutException(message)
|
|
except SSLError as e:
|
|
message = getattr(e, 'strerror', getattr(e, 'message', ''))
|
|
if message == "The read operation timed out":
|
|
raise WebSocketTimeoutException(message)
|
|
else:
|
|
raise
|
|
|
|
if not bytes:
|
|
raise WebSocketConnectionClosedException()
|
|
return bytes
|
|
|
|
def _recv_strict(self, bufsize):
|
|
shortage = bufsize - sum(len(x) for x in self._recv_buffer)
|
|
while shortage > 0:
|
|
bytes = self._recv(shortage)
|
|
self._recv_buffer.append(bytes)
|
|
shortage -= len(bytes)
|
|
|
|
unified = six.b("").join(self._recv_buffer)
|
|
|
|
if shortage == 0:
|
|
self._recv_buffer = []
|
|
return unified
|
|
else:
|
|
self._recv_buffer = [unified[bufsize:]]
|
|
return unified[:bufsize]
|
|
|
|
|
|
def _recv_line(self):
|
|
line = []
|
|
while True:
|
|
c = self._recv(1)
|
|
line.append(c)
|
|
if c == six.b("\n"):
|
|
break
|
|
return six.b("").join(line)
|
|
|
|
|
|
class WebSocketApp(object):
|
|
"""
|
|
Higher level of APIs are provided.
|
|
The interface is like JavaScript WebSocket object.
|
|
"""
|
|
def __init__(self, url, header=[],
|
|
on_open=None, on_message=None, on_error=None,
|
|
on_close=None, on_ping=None, on_pong=None,
|
|
on_cont_message=None,
|
|
keep_running=True, get_mask_key=None):
|
|
"""
|
|
url: websocket url.
|
|
header: custom header for websocket handshake.
|
|
on_open: callable object which is called at opening websocket.
|
|
this function has one argument. The arugment is this class object.
|
|
on_message: callbale object which is called when recieved data.
|
|
on_message has 2 arguments.
|
|
The 1st arugment is this class object.
|
|
The passing 2nd arugment is utf-8 string which we get from the server.
|
|
on_error: callable object which is called when we get error.
|
|
on_error has 2 arguments.
|
|
The 1st arugment is this class object.
|
|
The passing 2nd arugment is exception object.
|
|
on_close: callable object which is called when closed the connection.
|
|
this function has one argument. The arugment is this class object.
|
|
on_cont_message: callback object which is called when recieve continued frame data.
|
|
on_message has 3 arguments.
|
|
The 1st arugment is this class object.
|
|
The passing 2nd arugment is utf-8 string which we get from the server.
|
|
The 3rd arugment is continue flag. if 0, the data continue to next frame data
|
|
keep_running: a boolean flag indicating whether the app's main loop should
|
|
keep running, defaults to True
|
|
get_mask_key: a callable to produce new mask keys, see the WebSocket.set_mask_key's
|
|
docstring for more information
|
|
"""
|
|
self.url = url
|
|
self.header = header
|
|
self.on_open = on_open
|
|
self.on_message = on_message
|
|
self.on_error = on_error
|
|
self.on_close = on_close
|
|
self.on_ping = on_ping
|
|
self.on_pong = on_pong
|
|
self.on_cont_message = on_cont_message
|
|
self.keep_running = keep_running
|
|
self.get_mask_key = get_mask_key
|
|
self.sock = None
|
|
self.last_ping_tm = 0
|
|
|
|
def send(self, data, opcode=ABNF.OPCODE_TEXT):
|
|
"""
|
|
send message.
|
|
data: message to send. If you set opcode to OPCODE_TEXT, data must be utf-8 string or unicode.
|
|
opcode: operation code of data. default is OPCODE_TEXT.
|
|
"""
|
|
|
|
if self.sock.send(data, opcode) == 0:
|
|
raise WebSocketConnectionClosedException()
|
|
|
|
def close(self):
|
|
"""
|
|
close websocket connection.
|
|
"""
|
|
self.keep_running = False
|
|
self.sock.close()
|
|
|
|
def _send_ping(self, interval, event):
|
|
while not event.wait(interval):
|
|
self.last_ping_tm = time.time()
|
|
self.sock.ping()
|
|
|
|
def run_forever(self, sockopt=None, sslopt=None, ping_interval=0, ping_timeout=None):
|
|
"""
|
|
run event loop for WebSocket framework.
|
|
This loop is infinite loop and is alive during websocket is available.
|
|
sockopt: values for socket.setsockopt.
|
|
sockopt must be tuple and each element is argument of sock.setscokopt.
|
|
sslopt: ssl socket optional dict.
|
|
ping_interval: automatically send "ping" command every specified period(second)
|
|
if set to 0, not send automatically.
|
|
ping_timeout: timeout(second) if the pong message is not recieved.
|
|
"""
|
|
if not ping_timeout or ping_timeout<=0:
|
|
ping_timeout = None
|
|
if sockopt is None:
|
|
sockopt = []
|
|
if sslopt is None:
|
|
sslopt = {}
|
|
if self.sock:
|
|
raise WebSocketException("socket is already opened")
|
|
thread = None
|
|
|
|
try:
|
|
self.sock = WebSocket(self.get_mask_key, sockopt=sockopt, sslopt=sslopt,
|
|
fire_cont_frame=self.on_cont_message and True or False)
|
|
self.sock.settimeout(default_timeout)
|
|
self.sock.connect(self.url, header=self.header)
|
|
self._callback(self.on_open)
|
|
|
|
if ping_interval:
|
|
event = threading.Event()
|
|
thread = threading.Thread(target=self._send_ping, args=(ping_interval, event))
|
|
thread.setDaemon(True)
|
|
thread.start()
|
|
|
|
while True:
|
|
r, w, e = select.select((self.sock.sock, ), (), (), ping_timeout)
|
|
if not self.keep_running:
|
|
break
|
|
if ping_timeout and self.last_ping_tm and time.time() - self.last_ping_tm > ping_timeout:
|
|
self.last_ping_tm = 0
|
|
raise WebSocketTimeoutException()
|
|
|
|
if r:
|
|
op_code, frame = self.sock.recv_data_frame(True)
|
|
if op_code == ABNF.OPCODE_CLOSE:
|
|
break
|
|
elif op_code == ABNF.OPCODE_PING:
|
|
self._callback(self.on_ping, frame.data)
|
|
elif op_code == ABNF.OPCODE_PONG:
|
|
self._callback(self.on_pong, frame.data)
|
|
elif op_code == ABNF.OPCODE_CONT and self.on_cont_message:
|
|
self._callback(self.on_cont_message, frame.data, frame.fin)
|
|
else:
|
|
self._callback(self.on_message, frame.data)
|
|
except Exception as e:
|
|
self._callback(self.on_error, e)
|
|
finally:
|
|
if thread:
|
|
event.set()
|
|
thread.join()
|
|
self.keep_running = False
|
|
self.sock.close()
|
|
self._callback(self.on_close)
|
|
self.sock = None
|
|
|
|
def _callback(self, callback, *args):
|
|
if callback:
|
|
try:
|
|
callback(self, *args)
|
|
except Exception as e:
|
|
logger.error(e)
|
|
if logger.isEnabledFor(logging.DEBUG):
|
|
_, _, tb = sys.exc_info()
|
|
traceback.print_tb(tb)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
enableTrace(True)
|
|
ws = create_connection("ws://echo.websocket.org/")
|
|
print("Sending 'Hello, World'...")
|
|
ws.send("Hello, World")
|
|
print("Sent")
|
|
print("Receiving...")
|
|
result = ws.recv()
|
|
print("Received '%s'" % result)
|
|
ws.close()
|