def receive_datagram(self, args):
"""
Handle messages coming from the udp socket.
:param args: (data, client_address)
"""
data, client_address = args
logging.debug("receiving datagram")
try:
host, port = client_address
except ValueError:
host, port, tmp1, tmp2 = client_address
client_address = (host, port)
serializer = Serializer()
message = serializer.deserialize(data, client_address)
if isinstance(message, int):
logger.error("receive_datagram - BAD REQUEST")
rst = Message()
rst.destination = client_address
rst.type = Types["RST"]
rst.code = message
rst.mid = message.mid
self.send_datagram(rst)
return
logger.debug("receive_datagram - " + str(message))
if isinstance(message, Request):
if not message.proxy_uri or message.uri_path != "coap2http":
logger.error("receive_datagram - BAD REQUEST")
rst = Message()
rst.destination = client_address
rst.type = Types["RST"]
rst.code = Codes.BAD_REQUEST.number
rst.mid = message.mid
self.send_datagram(rst)
return
# Execute HTTP/HTTPS request
http_response = CoAP_HTTP.execute_http_request(message.code, message.proxy_uri, message.payload)
# HTTP response to CoAP response conversion
coap_response = CoAP_HTTP.to_coap_response(http_response, message.code, client_address, message.mid)
# Send datagram and return
self.send_datagram(coap_response)
return
elif isinstance(message, Message):
logger.error("Received message from %s", message.source)
else: # is Response
logger.error("Received response from %s", message.source)
def _test_with_client_observe(self, message_list, callback):
client = HelperClient(self.server_address)
token = None
last_mid = 0
for message, expected in message_list:
if message is not None:
token = message.token
client.send_request(message, callback)
received_message = self.queue.get()
if expected is not None:
last_mid = expected.mid
if expected.type is not None:
self.assertEqual(received_message.type, expected.type)
if expected.mid is not None:
self.assertEqual(received_message.mid, expected.mid)
self.assertEqual(received_message.code, expected.code)
if expected.source is not None:
self.assertEqual(received_message.source, self.server_address)
if expected.token is not None:
self.assertEqual(received_message.token, expected.token)
if expected.payload is not None:
self.assertEqual(received_message.payload, expected.payload)
if expected.options is not None:
self.assertEqual(received_message.options, expected.options)
message = Message()
message.type = defines.Types["RST"]
message.token = token
message._mid = last_mid
message.destination = self.server_address
client.send_empty(message)
client.stop()
def receive_datagram(self):
"""
Receive datagram from the UDP socket and invoke the callback function.
"""
logger.debug("Start receiver Thread")
while not self.stopped.isSet():
self._socket.settimeout(0.1)
try:
datagram, addr = self._socket.recvfrom(1152)
except socket.timeout: # pragma: no cover
continue
except Exception as e: # pragma: no cover
if self._cb_ignore_read_exception is not None and callable(self._cb_ignore_read_exception):
if self._cb_ignore_read_exception(e, self):
continue
return
else: # pragma: no cover
if len(datagram) == 0:
logger.debug("Exiting receiver Thread due to orderly shutdown on server end")
return
serializer = Serializer()
try:
host, port = addr
except ValueError:
host, port, tmp1, tmp2 = addr
source = (host, port)
message = serializer.deserialize(datagram, source)
if isinstance(message, Response):
logger.debug("receive_datagram - " + str(message))
transaction, send_ack = self._messageLayer.receive_response(message)
if transaction is None: # pragma: no cover
continue
self._wait_for_retransmit_thread(transaction)
if send_ack:
self._send_ack(transaction)
self._blockLayer.receive_response(transaction)
if transaction.block_transfer:
self._send_block_request(transaction)
continue
elif transaction is None: # pragma: no cover
self._send_rst(transaction)
return
self._observeLayer.receive_response(transaction)
if transaction.notification: # pragma: no cover
ack = Message()
ack.type = defines.Types['ACK']
ack = self._messageLayer.send_empty(transaction, transaction.response, ack)
self.send_datagram(ack)
self._callback(transaction.response)
else:
self._callback(transaction.response)
elif isinstance(message, Message):
self._messageLayer.receive_empty(message)
logger.debug("Exiting receiver Thread due to request")
def listen(self, timeout=10):
"""
Listen for incoming messages. Timeout is used to check if the server must be switched off.
:param timeout: Socket Timeout in seconds
"""
self._socket.settimeout(float(timeout))
while not self.stopped.isSet():
try:
data, client_address = self._socket.recvfrom(4096)
if len(client_address) > 2:
client_address = (client_address[0], client_address[1])
except socket.timeout:
continue
try:
serializer = Serializer()
message = serializer.deserialize(data, client_address)
if isinstance(message, int):
logger.error("receive_datagram - BAD REQUEST")
rst = Message()
rst.destination = client_address
rst.type = defines.Types["RST"]
rst.code = message
rst.mid = self._messageLayer._current_mid
self._messageLayer._current_mid += 1 % 65535
self.send_datagram(rst)
continue
logger.debug("receive_datagram - " + str(message))
if isinstance(message, Request):
transaction = self._messageLayer.receive_request(message)
if transaction.request.duplicated and transaction.completed:
logger.debug("message duplicated, transaction completed")
if transaction.response is not None:
self.send_datagram(transaction.response)
return
elif transaction.request.duplicated and not transaction.completed:
logger.debug("message duplicated, transaction NOT completed")
self._send_ack(transaction)
return
args = (transaction, )
t = threading.Thread(target=self.receive_request, args=args)
t.start()
# self.receive_datagram(data, client_address)
elif isinstance(message, Response):
logger.error("Received response from %s", message.source)
else: # is Message
transaction = self._messageLayer.receive_empty(message)
if transaction is not None:
with transaction:
self._blockLayer.receive_empty(message, transaction)
self._observeLayer.receive_empty(message, transaction)
except RuntimeError:
print "Exception with Executor"
self._socket.close()
def cancel_observing(self, response, send_rst): # pragma: no cover
if send_rst:
message = Message()
message.destination = self.server
message.code = defines.Codes.EMPTY.number
message.type = defines.Types["RST"]
message.token = response.token
message.mid = response.mid
self.protocol.send_message(message)
self.stop()
def coap_encode(payload):
message = Message()
message.type = defines.Types['CON']
message.token = 4321
message.mid = 2
message.options = None
message.payload = str(payload)
serializer = Serializer()
messagestring = serializer.serialize(message)
return messagestring
def to_coap_response(http_response, request_method, client_address, mid):
coap_msg = Message()
coap_msg.destination = client_address
coap_msg.type = Types["ACK"]
coap_msg.code = CoAP_HTTP.to_coap_code(http_response.status_code, request_method)
coap_msg.mid = mid
if 'Content-Type' in http_response.headers:
coap_msg.content_type = CoAP_HTTP.to_coap_content_type(http_response.headers['Content-Type'].split(";")[0])
else:
coap_msg.content_type = 0
coap_msg.payload = http_response.content
return coap_msg
def _send_ack(self, transaction):
"""
Sends an ACK message for the request.
:param transaction: the transaction that owns the request
"""
ack = Message()
ack.type = defines.Types['ACK']
# TODO handle mutex on transaction
if not transaction.request.acknowledged and transaction.request.type == defines.Types["CON"]:
ack = self._messageLayer.send_empty(transaction, transaction.request, ack)
self.send_datagram(ack)
def _send_rst(self, transaction): # pragma: no cover
"""
Sends an RST message for the response.
:param transaction: transaction that holds the response
"""
rst = Message()
rst.type = defines.Types['RST']
if not transaction.response.acknowledged:
rst = self._messageLayer.send_empty(transaction, transaction.response, rst)
self.send_datagram(rst)
def _send_ack(self, transaction):
"""
Sends an ACK message for the response.
:param transaction: transaction that holds the response
"""
ack = Message()
ack.type = defines.Types['ACK']
if not transaction.response.acknowledged:
ack = self._messageLayer.send_empty(transaction, transaction.response, ack)
self.send_datagram(ack)
def receive_datagram(self):
logger.debug("Start receiver Thread")
while not self.stopped.isSet():
self._socket.settimeout(1)
try:
datagram, addr = self._socket.recvfrom(1152)
except socket.timeout: # pragma: no cover
continue
except socket.error: # pragma: no cover
return
else: # pragma: no cover
if len(datagram) == 0:
print 'orderly shutdown on server end'
return
serializer = Serializer()
try:
host, port = addr
except ValueError:
host, port, tmp1, tmp2 = addr
source = (host, port)
message = serializer.deserialize(datagram, source)
if isinstance(message, Response):
transaction, send_ack = self._messageLayer.receive_response(message)
if transaction is None: # pragma: no cover
continue
if send_ack:
self._send_ack(transaction)
self._blockLayer.receive_response(transaction)
if transaction.block_transfer:
transaction = self._messageLayer.send_request(transaction.request)
self.send_datagram(transaction.request)
continue
elif transaction is None: # pragma: no cover
self._send_rst(transaction)
return
self._observeLayer.receive_response(transaction)
if transaction.notification: # pragma: no cover
ack = Message()
ack.type = defines.Types['ACK']
ack = self._messageLayer.send_empty(transaction, transaction.response, ack)
self.send_datagram(ack)
self._callback(transaction.response)
else:
self._callback(transaction.response)
elif isinstance(message, Message):
self._messageLayer.receive_empty(message)
def _send_rst(self, transaction):
# Handle separate
"""
Sends an RST message for the request.
:param request: [request, sleep_time] or request
"""
rst = Message()
rst.type = defines.Types['RST']
if not transaction.response.acknowledged:
rst = self._messageLayer.send_empty(transaction, transaction.response, rst)
self.send_datagram(rst)
def _send_ack(self, transaction):
# Handle separate
"""
Sends an ACK message for the request.
:param request: [request, sleep_time] or request
"""
ack = Message()
ack.type = defines.Types['ACK']
if not transaction.request.acknowledged:
ack = self._messageLayer.send_empty(transaction, transaction.request, ack)
self.send_datagram(ack)
def receive_datagram(self, args):
"""
Receive datagram from the udp socket.
:rtype : Message
"""
data, client_address = args
serializer = Serializer()
message = serializer.deserialize(data, client_address)
if isinstance(message, int):
logger.error("receive_datagram - BAD REQUEST")
rst = Message()
rst.destination = client_address
rst.type = defines.Types["RST"]
rst.code = message
self.send_datagram(rst)
return
logger.debug("receive_datagram - " + str(message))
if isinstance(message, Request):
transaction = self._messageLayer.receive_request(message)
if transaction.request.duplicated and transaction.completed:
logger.debug("message duplicated,transaction completed")
transaction = self._observeLayer.send_response(transaction)
transaction = self._blockLayer.send_response(transaction)
transaction = self._messageLayer.send_response(transaction)
self.send_datagram(transaction.response)
return
elif transaction.request.duplicated and not transaction.completed:
logger.debug("message duplicated,transaction NOT completed")
self._send_ack(transaction)
return
transaction.separate_timer = self._start_separate_timer(
transaction)
transaction = self._blockLayer.receive_request(transaction)
if transaction.block_transfer:
self._stop_separate_timer(transaction.separate_timer)
transaction = self._messageLayer.send_response(transaction)
self.send_datagram(transaction.response)
return
transaction = self._observeLayer.receive_request(transaction)
transaction = self._forwardLayer.receive_request(transaction)
transaction = self._observeLayer.send_response(transaction)
transaction = self._blockLayer.send_response(transaction)
self._stop_separate_timer(transaction.separate_timer)
transaction = self._messageLayer.send_response(transaction)
if transaction.response is not None:
if transaction.response.type == defines.Types["CON"]:
self._start_retrasmission(transaction,
transaction.response)
self.send_datagram(transaction.response)
elif isinstance(message, Message):
transaction = self._messageLayer.receive_empty(message)
if transaction is not None:
transaction = self._blockLayer.receive_empty(
message, transaction)
self._observeLayer.receive_empty(message, transaction)
else: # is Response
logger.error("Received response from %s", message.source)
def receive_datagram(self, args):
"""
Receive datagram from the udp socket.
:rtype : Message
"""
data, client_address = args
serializer = Serializer()
message = serializer.deserialize(data, client_address)
if isinstance(message, int):
logger.error("receive_datagram - BAD REQUEST")
rst = Message()
rst.destination = client_address
rst.type = defines.Types["RST"]
rst.code = message
self.send_datagram(rst)
return
logger.debug("receive_datagram - " + str(message))
if isinstance(message, Request):
transaction = self._messageLayer.receive_request(message)
if transaction.request.duplicated and transaction.completed:
logger.debug("message duplicated,transaction completed")
transaction = self._observeLayer.send_response(transaction)
transaction = self._blockLayer.send_response(transaction)
transaction = self._messageLayer.send_response(transaction)
self.send_datagram(transaction.response)
return
elif transaction.request.duplicated and not transaction.completed:
logger.debug("message duplicated,transaction NOT completed")
self._send_ack(transaction)
return
transaction.separate_timer = self._start_separate_timer(transaction)
transaction = self._blockLayer.receive_request(transaction)
if transaction.block_transfer:
self._stop_separate_timer(transaction.separate_timer)
transaction = self._messageLayer.send_response(transaction)
self.send_datagram(transaction.response)
return
transaction = self._observeLayer.receive_request(transaction)
transaction = self._forwardLayer.receive_request_reverse(transaction)
transaction = self._observeLayer.send_response(transaction)
transaction = self._blockLayer.send_response(transaction)
self._stop_separate_timer(transaction.separate_timer)
transaction = self._messageLayer.send_response(transaction)
if transaction.response is not None:
if transaction.response.type == defines.Types["CON"]:
self._start_retrasmission(transaction, transaction.response)
self.send_datagram(transaction.response)
elif isinstance(message, Message):
transaction = self._messageLayer.receive_empty(message)
if transaction is not None:
transaction = self._blockLayer.receive_empty(message, transaction)
self._observeLayer.receive_empty(message, transaction)
else: # pragma: no cover
logger.error("Received response from %s", message.source)
def receive_datagram(self):
"""
Receive datagram from the UDP socket and invoke the callback function.
"""
logger.debug("Start receiver Thread")
while not self.stopped.isSet():
self._socket.settimeout(0.1)
try:
datagram, addr = self._socket.recvfrom(1152)
except socket.timeout: # pragma: no cover
continue
except Exception as e: # pragma: no cover
if self._cb_ignore_read_exception is not None and callable(
self._cb_ignore_read_exception):
if self._cb_ignore_read_exception(e, self):
continue
return
else: # pragma: no cover
if len(datagram) == 0:
logger.debug(
"Exiting receiver Thread due to orderly shutdown on server end"
)
return
serializer = Serializer()
try:
host, port = addr
except ValueError:
host, port, tmp1, tmp2 = addr
source = (host, port)
message = serializer.deserialize(datagram, source)
if isinstance(message, Response):
logger.debug("receive_datagram - " + str(message))
transaction, send_ack = self._messageLayer.receive_response(
message)
if transaction is None: # pragma: no cover
continue
self._wait_for_retransmit_thread(transaction)
if send_ack:
self._send_ack(transaction)
self._blockLayer.receive_response(transaction)
if transaction.block_transfer:
self._send_block_request(transaction)
continue
elif transaction is None: # pragma: no cover
self._send_rst(transaction)
return
self._observeLayer.receive_response(transaction)
if transaction.notification: # pragma: no cover
ack = Message()
ack.type = defines.Types['ACK']
ack = self._messageLayer.send_empty(
transaction, transaction.response, ack)
self.send_datagram(ack)
self._callback(transaction.response)
else:
self._callback(transaction.response)
elif isinstance(message, Message):
self._messageLayer.receive_empty(message)
logger.debug("Exiting receiver Thread due to request")
def listen(self, timeout=10):
"""
Listen for incoming messages. Timeout is used to check if the server must be switched off.
:param timeout: Socket Timeout in seconds
"""
self._socket.settimeout(float(timeout))
while not self.stopped.isSet():
try:
data, client_address = self._socket.recvfrom(4096)
if len(client_address) > 2:
client_address = (client_address[0], client_address[1])
except socket.timeout:
continue
except Exception as e:
if self._cb_ignore_listen_exception is not None and callable(
self._cb_ignore_listen_exception):
if self._cb_ignore_listen_exception(e, self):
continue
raise
try:
serializer = Serializer()
message = serializer.deserialize(data, client_address)
if isinstance(message, int):
logger.error("receive_datagram - BAD REQUEST")
rst = Message()
rst.destination = client_address
rst.type = defines.Types["RST"]
rst.code = message
rst.mid = self._messageLayer.fetch_mid()
self.send_datagram(rst)
continue
logger.debug("receive_datagram - " + str(message))
if isinstance(message, Request):
transaction = self._messageLayer.receive_request(message)
if transaction.request.duplicated and transaction.completed:
logger.debug(
"message duplicated, transaction completed")
if transaction.response is not None:
self.send_datagram(transaction.response)
continue
elif transaction.request.duplicated and not transaction.completed:
logger.debug(
"message duplicated, transaction NOT completed")
self._send_ack(transaction)
continue
args = (transaction, )
t = threading.Thread(target=self.receive_request,
args=args)
t.start()
# self.receive_datagram(data, client_address)
elif isinstance(message, Response):
logger.error("Received response from %s", message.source)
else: # is Message
transaction = self._messageLayer.receive_empty(message)
if transaction is not None:
with transaction:
self._blockLayer.receive_empty(
message, transaction)
self._observeLayer.receive_empty(
message, transaction)
except RuntimeError:
logger.exception("Exception with Executor")
self._socket.close()
def receive_datagram(self, args):
"""
Handle messages coming from the udp socket.
:param args: (data, client_address)
"""
data, client_address = args
serializer = Serializer()
message = serializer.deserialize(data, client_address)
if isinstance(message, int):
logger.error("receive_datagram - BAD REQUEST")
rst = Message()
rst.destination = client_address
rst.type = defines.Types["RST"]
rst.code = message
self.send_datagram(rst)
return
logger.debug("receive_datagram - " + str(message))
if isinstance(message, Request):
transaction = self._messageLayer.receive_request(message)
if transaction.request.duplicated and transaction.completed:
logger.debug("message duplicated,transaction completed")
transaction = self._observeLayer.send_response(transaction)
transaction = self._blockLayer.send_response(transaction)
transaction = self._messageLayer.send_response(transaction)
self.send_datagram(transaction.response)
return
elif transaction.request.duplicated and not transaction.completed:
logger.debug("message duplicated,transaction NOT completed")
self._send_ack(transaction)
return
transaction.separate_timer = self._start_separate_timer(
transaction)
transaction = self._blockLayer.receive_request(transaction)
if transaction.block_transfer:
self._stop_separate_timer(transaction.separate_timer)
transaction = self._messageLayer.send_response(transaction)
self.send_datagram(transaction.response)
return
transaction = self._observeLayer.receive_request(transaction)
"""
call to the cache layer to check if there's a cached response for the request
if not, call the forward layer
"""
if self._cacheLayer is not None:
transaction = self._cacheLayer.receive_request(transaction)
if transaction.cacheHit is False:
logger.debug(transaction.request)
transaction = self._forwardLayer.receive_request_reverse(
transaction)
logger.debug(transaction.response)
transaction = self._observeLayer.send_response(transaction)
transaction = self._blockLayer.send_response(transaction)
transaction = self._cacheLayer.send_response(transaction)
else:
transaction = self._forwardLayer.receive_request_reverse(
transaction)
transaction = self._observeLayer.send_response(transaction)
transaction = self._blockLayer.send_response(transaction)
self._stop_separate_timer(transaction.separate_timer)
transaction = self._messageLayer.send_response(transaction)
if transaction.response is not None:
if transaction.response.type == defines.Types["CON"]:
self._start_retrasmission(transaction,
transaction.response)
self.send_datagram(transaction.response)
elif isinstance(message, Message):
transaction = self._messageLayer.receive_empty(message)
if transaction is not None:
transaction = self._blockLayer.receive_empty(
message, transaction)
self._observeLayer.receive_empty(message, transaction)
else: # pragma: no cover
logger.error("Received response from %s", message.source)
message = serializer.deserialize(datagram, source)
if isinstance(message, Response):
transaction, send_ack = self._messageLayer.receive_response(message)
if send_ack:
self._send_ack(transaction)
transaction = self._blockLayer.receive_response(transaction)
if transaction.block_transfer:
transaction = self._messageLayer.send_request(transaction.request)
self.send_datagram(transaction.request)
continue
transaction = self._observeLayer.receive_response(transaction)
if transaction.notification:
ack = Message()
ack.type = defines.Types['ACK']
ack = self._messageLayer.send_empty(transaction, transaction.response, ack)
self.send_datagram(ack)
self._callback(transaction.response)
else:
self._callback(transaction.response)
elif isinstance(message, Message):
transaction = self._messageLayer.receive_empty(message)
def _send_ack(self, transaction):
# Handle separate
"""
Sends an ACK message for the request.
:param request: [request, sleep_time] or request
"""
def receive_datagram(self, args):
"""
Handle messages coming from the udp socket.
:param args: (data, client_address)
"""
data, client_address = args
logging.debug("receiving datagram")
try:
host, port = client_address
except ValueError:
host, port, tmp1, tmp2 = client_address
client_address = (host, port)
serializer = Serializer()
message = serializer.deserialize(data, client_address)
if isinstance(message, int):
logger.error("receive_datagram - BAD REQUEST")
rst = Message()
rst.destination = client_address
rst.type = defines.Types["RST"]
rst.code = message
self.send_datagram(rst)
return
logger.debug("receive_datagram - " + str(message))
if isinstance(message, Request):
transaction = self._messageLayer.receive_request(message)
if transaction.request.duplicated and transaction.completed:
logger.debug("message duplicated,transaction completed")
transaction = self._observeLayer.send_response(transaction)
transaction = self._blockLayer.send_response(transaction)
transaction = self._messageLayer.send_response(transaction)
self.send_datagram(transaction.response)
return
elif transaction.request.duplicated and not transaction.completed:
logger.debug("message duplicated,transaction NOT completed")
self._send_ack(transaction)
return
transaction.separate_timer = self._start_separate_timer(transaction)
transaction = self._blockLayer.receive_request(transaction)
if transaction.block_transfer:
self._stop_separate_timer(transaction.separate_timer)
transaction = self._messageLayer.send_response(transaction)
self.send_datagram(transaction.response)
return
transaction = self._observeLayer.receive_request(transaction)
"""
call to the cache layer to check if there's a cached response for the request
if not, call the forward layer
"""
if self._cacheLayer is not None:
transaction = self._cacheLayer.receive_request(transaction)
if transaction.cacheHit is False:
logging.debug(transaction.request)
transaction = self._forwardLayer.receive_request(transaction)
logging.debug(transaction.response)
transaction = self._observeLayer.send_response(transaction)
transaction = self._blockLayer.send_response(transaction)
transaction = self._cacheLayer.send_response(transaction)
else:
transaction = self._forwardLayer.receive_request(transaction)
transaction = self._observeLayer.send_response(transaction)
transaction = self._blockLayer.send_response(transaction)
self._stop_separate_timer(transaction.separate_timer)
transaction = self._messageLayer.send_response(transaction)
if transaction.response is not None:
if transaction.response.type == defines.Types["CON"]:
self._start_retransmission(transaction, transaction.response)
self.send_datagram(transaction.response)
elif isinstance(message, Message):
transaction = self._messageLayer.receive_empty(message)
if transaction is not None:
transaction = self._blockLayer.receive_empty(message, transaction)
self._observeLayer.receive_empty(message, transaction)
else: # is Response
logger.error("Received response from %s", message.source)