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microWebSocket.py
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from hashlib import sha1
from binascii import b2a_base64
from struct import pack
from _thread import start_new_thread
import gc
class MicroWebSocket :
# ============================================================================
# ===( Constants )============================================================
# ============================================================================
_handshakeSign = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
_opContFrame = 0x0
_opTextFrame = 0x1
_opBinFrame = 0x2
_opCloseFrame = 0x8
_opPingFrame = 0x9
_opPongFrame = 0xA
_msgTypeText = 1
_msgTypeBin = 2
# ============================================================================
# ===( Utils )===============================================================
# ============================================================================
def _tryAllocByteArray(size) :
for x in range(10) :
try :
gc.collect()
return bytearray(size)
except :
pass
return None
# ----------------------------------------------------------------------------
def _tryStartThread(func, args=()) :
for x in range(10) :
try :
gc.collect()
start_new_thread(func, args)
return True
except :
pass
return False
# ============================================================================
# ===( Constructor )==========================================================
# ============================================================================
def __init__(self, socket, httpClient, httpResponse, maxRecvLen, threaded, acceptCallback) :
self._socket = socket
self._httpCli = httpClient
self._closed = True
self.RecvTextCallback = None
self.RecvBinaryCallback = None
self.ClosedCallback = None
if self._handshake(httpResponse) :
self._ctrlBuf = MicroWebSocket._tryAllocByteArray(0x7D)
self._msgBuf = MicroWebSocket._tryAllocByteArray(maxRecvLen)
if self._ctrlBuf and self._msgBuf :
self._msgType = None
self._msgLen = 0
if threaded :
if MicroWebSocket._tryStartThread(self._wsProcess, (acceptCallback, )) :
return
else :
self._wsProcess(acceptCallback)
return
print("MicroWebSocket : Out of memory on new WebSocket connection.")
try :
self._socket.close()
except :
pass
# ============================================================================
# ===( Functions )============================================================
# ============================================================================
def _handshake(self, httpResponse) :
try :
key = self._httpCli.GetRequestHeaders().get('Sec-WebSocket-Key', None)
if key :
r = sha1(key + self._handshakeSign).digest()
r = b2a_base64(r).decode()
httpResponse.WriteSwitchProto("websocket", { "Sec-WebSocket-Accept" : r })
return True
except :
pass
return False
# ----------------------------------------------------------------------------
def _wsProcess(self, acceptCallback) :
self._socket.settimeout(3600)
self._closed = False
try :
acceptCallback(self, self._httpCli)
except Exception as ex :
print("MicroWebSocket : Error on accept callback (%s)." % str(ex))
while not self._closed :
if not self._receiveFrame() :
self.Close()
if self.ClosedCallback :
try :
self.ClosedCallback(self)
except Exception as ex :
print("MicroWebSocket : Error on closed callback (%s)." % str(ex))
# ----------------------------------------------------------------------------
def _receiveFrame(self) :
try :
b = self._socket.read(2)
if not b or len(b) != 2 :
return False
fin = b[0] & 0x80 > 0
opcode = b[0] & 0x0F
masked = b[1] & 0x80 > 0
length = b[1] & 0x7F
if opcode == self._opContFrame and not self._msgType :
return False
elif opcode == self._opTextFrame :
self._msgType = self._msgTypeText
elif opcode == self._opBinFrame :
self._msgType = self._msgTypeBin
if length == 0x7E :
b = self._socket.read(2)
if not b or len(b) != 2 :
return False
length = (b[0] << 8) + b[1]
elif length == 0x7F :
return False
mask = self._socket.read(4) if masked else None
if masked and (not mask or len(mask) != 4) :
return False
if opcode == self._opContFrame or \
opcode == self._opTextFrame or \
opcode == self._opBinFrame :
if length > 0 :
buf = memoryview(self._msgBuf)[self._msgLen:]
if length > len(buf) :
return False
if self._socket.readinto(buf, length) != length :
return False
if masked :
for i in range(length) :
idx = self._msgLen + i
self._msgBuf[idx] ^= mask[i%4]
self._msgLen += length
if fin :
b = bytes(memoryview(self._msgBuf)[:self._msgLen])
if self._msgType == self._msgTypeText :
if self.RecvTextCallback :
try :
self.RecvTextCallback(self, b.decode())
except Exception as ex :
print("MicroWebSocket : Error on recv text callback (%s)." % str(ex))
else :
if self.RecvBinaryCallback :
try :
self.RecvBinaryCallback(self, b)
except Exception as ex :
print("MicroWebSocket : Error on recv binary callback (%s)." % str(ex))
self._msgType = None
self._msgLen = 0
else :
return False
elif opcode == self._opPingFrame :
if length > len(self._ctrlBuf) :
return False
if length > 0 :
if self._socket.readinto(self._ctrlBuf, length) != length :
return False
pingData = memoryview(self._ctrlBuf)[:length]
else :
pingData = None
self._sendFrame(self._opPongFrame, pingData)
elif opcode == self._opCloseFrame :
self.Close()
except :
return False
return True
# ----------------------------------------------------------------------------
def _sendFrame(self, opcode, data=None, fin=True) :
if not self._closed and opcode >= 0x00 and opcode <= 0x0F :
dataLen = 0 if not data else len(data)
if dataLen <= 0xFFFF :
b1 = (0x80 | opcode) if fin else opcode
b2 = 0x7E if dataLen >= 0x7E else dataLen
try :
if self._socket.write(pack('>BB', b1, b2)) == 2 :
if dataLen > 0 :
if dataLen >= 0x7E :
self._socket.write(pack('>H', dataLen))
return self._socket.write(data) == dataLen
else :
return True
except :
pass
return False
# ----------------------------------------------------------------------------
def SendText(self, msg) :
return self._sendFrame(self._opTextFrame, msg.encode())
# ----------------------------------------------------------------------------
def SendBinary(self, data) :
return self._sendFrame(self._opBinFrame, data)
# ----------------------------------------------------------------------------
def IsClosed(self) :
return self._closed
# ----------------------------------------------------------------------------
def Close(self) :
if not self._closed :
try :
self._sendFrame(self._opCloseFrame)
self._socket.close()
self._closed = True
except :
pass
# ============================================================================
# ============================================================================
# ============================================================================