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import socket
from urlparse import urlparse
import random
class ConnectionClosedException(Exception):
pass
default_timeout = None
def setdefaulttimeout(timeout):
"""
Set the global timeout setting to connect.
"""
global default_timeout
default_timeout = timeout
def getdefaulttimeout():
"""
Return the global timeout setting to connect.
"""
return default_timeout
def _parse_url(url):
parsed = urlparse(url)
if parsed.hostname:
hostname = parsed.hostname
else:
raise ValueError("hostname is invalid")
if parsed.scheme == "ws":
if parsed.port:
port = parsed.port
else:
port = 80
else:
raise ValueError("scheme %s is invalid" % parsed.scheme)
if parsed.path:
resource = parsed.path
else:
resource = "/"
return (hostname, port, resource)
def create_connection(url, timeout=None):
"""
connect to url and return websocket object.
Connect to url and return the WebSocket object.
Passing optional timeout parameter will set the timeout on the socket.
If no timeout is supplied, the global default timeout setting returned by getdefauttimeout() is used.
"""
try:
websock = WebSocket()
websock.settimeout(timeout != None and timeout or default_timeout)
websock.connect(url)
return websock
except Exception, e:
#websock.close()
raise e
_MAX_INTEGER = (1 << 32) -1
_AVAILABLE_KEY_CHARS = range(0x21, 0x2f + 1) + range(0x3a, 0x7e + 1)
_MAX_CHAR_BYTE = (1<<8) -1
# ref. Websocket gets an update, and it breaks stuff.
# http://axod.blogspot.com/2010/06/websocket-gets-update-and-it-breaks.html
def _create_sec_websocket_key():
spaces_n = random.randint(1, 12)
max_n = _MAX_INTEGER / spaces_n
number_n = random.randint(0, max_n)
product_n = number_n * spaces_n
key_n = str(product_n)
for i in range(random.randint(1, 12)):
c = random.choice(_AVAILABLE_KEY_CHARS)
pos = random.randint(0, len(key_n))
key_n = key_n[0:pos] + chr(c) + key_n[pos:]
for i in range(spaces_n):
pos = random.randint(1, len(key_n)-1)
key_n = key_n[0:pos] + " " + key_n[pos:]
return number_n, key_n
def _create_key3():
return "".join([chr(random.randint(0, _MAX_CHAR_BYTE)) for i in range(8)])
class WebSocket(object):
def __init__(self):
"""
Initalize WebSocket object.
"""
self.sock = socket.socket()
def settimeout(self, timeout):
"""
Set the timeout to the websocket.
"""
self.sock.settimeout(timeout)
def gettimeout(self):
"""
Get the websocket timeout.
"""
return self.sock.gettimeout()
def connect(self, url):
"""
Connect to url. url is websocket url scheme. ie. ws://host:port/resource
"""
hostname, port, resource = _parse_url(url)
self.sock.connect((hostname, port))
self._handshake(hostname, port, resource)
def _handshake(self, host, port, resource):
sock = self.sock
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)
headers.append("Origin: %s" % hostport)
number_1, key_1 = _create_sec_websocket_key()
# headers.append("Sec-WebSocket-Key1: %s" % key_1)
number_2, key_2 = _create_sec_websocket_key()
# headers.append("Sec-WebSocket-Key2: %s" % key_2)
header_str = "\r\n".join(headers)
sock.send(header_str)
sock.send("\r\n\r\n")
key3 = _create_key3()
#sock.send(key3)
while True:
line = self._recv_line()
# TODO: check handshake response
if line == "\r\n":
break
def send(self, payload):
"""
Send the data as string. payload must be utf-8 string or unicoce.
"""
if isinstance(payload, unicode):
payload = payload.encode("utf-8")
self.sock.send("".join(["\x00", payload, "\xff"]))
def recv(self):
"""
Reeive utf-8 string data from the server.
"""
bytes = []
while True:
b = self._recv(1)
if b == "\xff":
break
elif b == "\x00":
# start bytes
pass
else:
bytes.append(b)
return "".join(bytes)
def close(self):
"""
Close Websocket object
"""
self.sock.close()
def _recv(self, bufsize):
bytes = self.sock.recv(bufsize)
if not bytes:
raise ConnectionClosedException()
return bytes
def _recv_line(self):
line = []
while True:
c = self._recv(1)
line.append(c)
if c == "\n":
break
return "".join(line)
if __name__ == "__main__":
ws = create_connection("ws://localhost:5000/chat")
print "Sending 'Hello, World'..."
ws.send("Hello, World")
print "Sent"
print "Reeiving..."
result = ws.recv()
print "Received '%s'" % result
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