def _open_session(self, is_server):
assert is_server or self.session_id is None
# The transport should be connected at this point.
try:
# Send hello message.
self.send_hello((NC_BASE_10, NC_BASE_11), self.session_id)
# Get reply
reply = self._receive_message()
if self.debug:
logger.debug("Received HELLO")
# Parse reply
tree = etree.parse(io.BytesIO(reply.encode('utf-8')))
root = tree.getroot()
caps = root.xpath("//nc:hello/nc:capabilities/nc:capability",
namespaces=NSMAP)
# Store capabilities
for cap in caps:
self.capabilities.add(cap.text)
if NC_BASE_11 in self.capabilities:
self.new_framing = True
elif NC_BASE_10 not in self.capabilities:
raise SessionError(
"Server doesn't implement 1.0 or 1.1 of netconf")
# Get session ID.
try:
session_id = root.xpath("//nc:hello/nc:session-id",
namespaces=NSMAP)[0].text
# If we are a server it is a failure to receive a session id.
if is_server:
raise SessionError("Client sent a session-id")
self.session_id = int(session_id)
except (KeyError, IndexError, AttributeError):
if not is_server:
raise SessionError("Server didn't supply session-id")
except ValueError:
raise SessionError(
"Server supplied non integer session-id: {}", session_id)
self.session_open = True
# Create reader thread.
self.reader_thread = threading.Thread(
target=self._read_message_thread)
self.reader_thread.daemon = True
self.reader_thread.keep_running = True
self.reader_thread.start()
if self.debug:
logger.debug("%s: Opened version %s session.", str(self),
"1.1" if self.new_framing else "1.0")
except Exception:
self.close()
raise
def _reader_handle_message(self, msg):
"""This function is called from the session reader thread to process a received
framed netconf message.
"""
try:
tree = etree.parse(io.BytesIO(msg.encode('utf-8')))
if not tree:
raise SessionError(msg, "Invalid XML from server.")
except etree.XMLSyntaxError:
raise SessionError(msg, "Invalid XML from server.")
replies = tree.xpath("/nc:rpc-reply", namespaces=NSMAP)
if not replies:
raise SessionError(msg, "No rpc-reply found")
for reply in replies:
try:
msg_id = int(reply.get(qmap("nc") + 'message-id'))
except (TypeError, ValueError):
try:
# Deal with servers not properly setting attribute namespace.
msg_id = int(reply.get('message-id'))
except (TypeError, ValueError):
# # Cisco is returning errors without message-id attribute which
# # is non-rfc-conforming it is doing this for any malformed XML
# # not simply missing message-id attribute.
# error = reply.xpath("nc:rpc-error", namespaces=self.nsmap)
# if error:
# raise RPCError(received, tree, error[0])
raise SessionError(msg,
"No valid message-id attribute found")
# Queue the message
with self.cv:
try:
if msg_id not in self.rpc_out:
if self.debug:
logger.debug(
"Ignoring unwanted reply for message-id %s",
str(msg_id))
return
elif self.rpc_out[msg_id] is not None:
logger.warning(
"Received multiple replies for message-id %s:"
" before: %s now: %s", str(msg_id),
str(self.rpc_out[msg_id]), str(msg))
if self.debug:
logger.debug("%s: Received rpc-reply message-id: %s",
str(self), str(msg_id))
self.rpc_out[msg_id] = tree, reply, msg
except Exception as error:
logger.debug("%s: Unexpected exception: %s", str(self),
str(error))
raise
finally:
self.cv.notify_all()
def reader_handle_message(self, msg):
"""Handle a message, lock is already held"""
try:
tree = etree.parse(io.BytesIO(msg.encode('utf-8')))
if not tree:
raise SessionError(msg, "Invalid XML from server.")
except etree.XMLSyntaxError:
raise SessionError(msg, "Invalid XML from server.")
replies = tree.xpath("/nc:rpc-reply", namespaces=NSMAP)
if not replies:
notification = tree.xpath("/*[name()='notification']")
if not notification:
raise SessionError(msg, "No rpc-reply or notification found")
else:
logger.info("* NOTIF received *")
logger.info(etree.tostring(tree, pretty_print=True))
return
for reply in replies:
try:
msg_id = int(reply.get('message-id'))
except (TypeError, ValueError):
# # Cisco is returning errors without message-id attribute which is non-rfc-conforming
# # it is doing this for any malformed XML not simply missing message-id attribute.
# error = reply.xpath("nc:rpc-error", namespaces=self.nsmap)
# if error:
# raise RPCError(received, tree, error[0])
raise SessionError(msg, "No valid message-id attribute found")
# Queue the message
with self.cv:
try:
if msg_id not in self.rpc_out:
if self.debug:
logger.debug(
"Ignoring unwanted reply for message-id %s",
str(msg_id))
return
elif self.rpc_out[msg_id] is not None:
logger.warning(
"Received multiple replies for message-id %s:"
" before: %s now: %s", str(msg_id),
str(self.rpc_out[msg_id]), str(msg))
if self.debug:
logger.debug("%s: Received rpc-reply message-id: %s",
str(self), str(msg_id))
self.rpc_out[msg_id] = tree, reply, msg
except Exception as error:
logger.debug("%s: Unexpected exception: %s", str(self),
str(error))
raise
finally:
self.cv.notify_all()
def wait_reply(self, msg_id, timeout=None):
assert msg_id in self.rpc_out
check_timeout = Timeout(timeout)
self.cv.acquire()
# XXX need to make sure the channel doesn't close
while self.rpc_out[msg_id] is None and self.is_active():
remaining = check_timeout.remaining()
self.cv.wait(remaining)
if self.rpc_out[msg_id] is not None:
break
if check_timeout.is_expired():
raise ReplyTimeoutError(
"Timeout ({}s) while waiting for RPC reply to msg-id: {}".
format(timeout, msg_id))
if not self.is_active():
self.cv.release()
raise SessionError("Session closed while waiting for reply")
tree, reply, msg = self.rpc_out[msg_id]
del self.rpc_out[msg_id]
self.cv.release()
error = reply.xpath("nc:rpc-error", namespaces=NSMAP)
if error:
raise RPCError(msg, tree, error[0])
# data = reply.xpath("nc:data", namespaces=self.nsmap)
# ok = reply.xpath("nc:ok", namespaces=self.nsmap)
return tree, reply, msg
def _handle_message (self, msg):
"""Handle a message, lock is already held"""
try:
tree = etree.parse(io.BytesIO(msg.encode('utf-8')))
if not tree:
raise SessionError(msg, "Invalid XML from server.")
except etree.XMLSyntaxError:
raise SessionError(msg, "Invalid XML from server.")
replies = tree.xpath("/nc:rpc-reply", namespaces=NSMAP)
if not replies:
raise SessionError(msg, "No rpc-reply found")
for reply in replies:
try:
msg_id = int(reply.get('message-id'))
except (TypeError, ValueError):
# # Cisco is returning errors without message-id attribute which is non-rfc-conforming
# # it is doing this for any malformed XML not simply missing message-id attribute.
# error = reply.xpath("nc:rpc-error", namespaces=self.nsmap)
# if error:
# raise RPCError(received, tree, error[0])
raise SessionError(msg, "No valid message-id attribute found")
if msg_id not in self.rpc_out:
if self.debug:
logger.debug("Ignoring unwanted reply for message-id %s", str(msg_id))
return
elif self.rpc_out[msg_id] is not None:
logger.warning("Received multiple replies for message-id %s: before: %s now: %s",
str(msg_id), str(self.rpc_out[msg_id]), str(msg))
if self.debug:
logger.debug("%s: Received rpc-reply message-id: %s",
str(self),
str(msg_id))
self.rpc_out[msg_id] = tree, reply, msg
def wait_reply(self, msg_id, timeout=None):
"""Wait for a reply to a given RPC message ID.
:param msg_id: the RPC message ID returned from one of the async method calls
:return: (Message as an lxml tree, Parsed reply content, Parsed message content).
:rtype: (lxml.etree, lxml.Element, lxml.Element)
:raises: RPCError, SessionError
"""
assert msg_id in self.rpc_out
check_timeout = Timeout(timeout)
self.cv.acquire()
# XXX need to make sure the channel doesn't close
while self.rpc_out[msg_id] is None and self.is_active():
remaining = check_timeout.remaining()
self.cv.wait(remaining)
if self.rpc_out[msg_id] is not None:
break
if check_timeout.is_expired():
raise ReplyTimeoutError(
"Timeout ({}s) while waiting for RPC reply to msg-id: {}".
format(timeout, msg_id))
if not self.is_active():
self.cv.release()
raise SessionError("Session closed while waiting for reply")
tree, reply, msg = self.rpc_out[msg_id]
del self.rpc_out[msg_id]
self.cv.release()
error = reply.xpath("nc:rpc-error", namespaces=NSMAP)
if error:
raise RPCError(msg, tree, error[0])
# data = reply.xpath("nc:data", namespaces=self.nsmap)
# ok = reply.xpath("nc:ok", namespaces=self.nsmap)
return tree, reply, msg
def wait_reply (self, msg_id):
assert msg_id in self.rpc_out
self.cv.acquire()
# XXX need to make sure the channel doesn't close
while self.rpc_out[msg_id] is None and self.is_active():
self.cv.wait()
if not self.is_active():
raise SessionError("Session closed while waiting for reply")
tree, reply, msg = self.rpc_out[msg_id]
del self.rpc_out[msg_id]
self.cv.release()
error = reply.xpath("nc:rpc-error", namespaces=NSMAP)
if error:
raise RPCError(msg, tree, error[0])
# data = reply.xpath("nc:data", namespaces=self.nsmap)
# ok = reply.xpath("nc:ok", namespaces=self.nsmap)
return tree, reply, msg
def is_reply_ready(self, msg_id):
"""Check whether reply is ready (or session closed)"""
with self.cv:
if not self.is_active():
raise SessionError("Session closed while checking for reply")
return self.rpc_out[msg_id] is not None
def is_reply_ready (self, msg_id):
"""Check whether reply is ready (or session closed)"""
if not self.is_active():
raise SessionError("Session closed while checking for reply")
with self.cv:
return self.is_reply_ready_locked(msg_id)
def _reader_handle_message(self, msg):
"""This function is called from the session reader thread to process a received
framed netconf message.
"""
try:
tree = etree.parse(io.BytesIO(msg.encode('utf-8')))
if not tree:
raise SessionError(msg, "Invalid XML from server.")
except etree.XMLSyntaxError:
raise SessionError(msg, "Invalid XML from server.")
replies = tree.xpath("/nc:rpc-reply", namespaces=NSMAP)
tmp_NS = {'tmp': 'urn:ietf:params:xml:ns:netconf:notification:1.0'}
notifications = tree.xpath("/tmp:notification", namespaces=tmp_NS)
if not replies and not notifications:
raise SessionError(msg, "No rpc-reply found")
for reply in replies:
try:
msg_id = int(reply.get(qmap("nc") + 'message-id'))
except (TypeError, ValueError):
try:
# Deal with servers not properly setting attribute namespace.
msg_id = int(reply.get('message-id'))
except (TypeError, ValueError):
# # Cisco is returning errors without message-id attribute which
# # is non-rfc-conforming it is doing this for any malformed XML
# # not simply missing message-id attribute.
# error = reply.xpath("nc:rpc-error", namespaces=self.nsmap)
# if error:
# raise RPCError(received, tree, error[0])
raise SessionError(msg,
"No valid message-id attribute found")
# Queue the message
with self.cv:
try:
if msg_id not in self.rpc_out:
if self.debug:
logger.debug(
"Ignoring unwanted reply for message-id %s",
str(msg_id))
return
elif self.rpc_out[msg_id] is not None:
logger.warning(
"Received multiple replies for message-id %s:"
" before: %s now: %s", str(msg_id),
str(self.rpc_out[msg_id]), str(msg))
if self.debug:
logger.debug("%s: Received rpc-reply message-id: %s",
str(self), str(msg_id))
self.rpc_out[msg_id] = tree, reply, msg
except Exception as error:
logger.debug("%s: Unexpected exception: %s", str(self),
str(error))
raise
finally:
self.cv.notify_all()
for notif in notifications:
push_update_node = notif.find("yp:push-update", namespaces=NSMAP)
id_node = push_update_node.find("tmp:id", namespaces=tmp_NS)
subscription_id = int(id_node.text)
with self.notification_queues_lock:
if subscription_id not in self.notification_queues:
tmp_queue = self.tmp_notification_queues.get(
subscription_id, Queue())
tmp_queue.put(notif)
self.tmp_notification_queues[subscription_id] = tmp_queue
else:
self.notification_queues[subscription_id].put(notif)
