def get_rpc_handler(self, rpc_node, msg, grpc_channel, session,
capabilities):
try:
# Parse the request into a dictionary
log.info("rpc-node",
node=etree.tostring(rpc_node, pretty_print=True))
request = self.parse_xml_request(rpc_node)
if not request:
log.error("request-bad-format")
raise ncerror.BadMsg(rpc_node)
log.info("parsed-request", request=request)
if not request.has_key('message_id'):
log.error("request-no-message-id")
raise ncerror.BadMsg(rpc_node)
class_handler = self._get_rpc_handler(request['command'])
if class_handler is not None:
return class_handler(request, rpc_node, grpc_channel, session,
capabilities)
log.error("rpc-not-implemented", rpc=request['command'])
except ncerror.BadMsg as err:
log.info('ncerror.BadMsg')
raise ncerror.BadMsg(rpc_node)
except Exception as e:
log.exception('exception', e=e)
raise ncerror.ServerException(rpc_node, exception=e)
def _validate_parameters(self):
log.info('validate-parameters', session=self.session.session_id)
# Validate the GET-SCHEMA command
if self.request:
try:
if self.request['command'] != 'get-schema' or \
not self.request.has_key('identifier') or \
not self.request.has_key('format') or \
not self.request.has_key('version'):
self.rpc_response.is_error = True
self.rpc_response.node = ncerror.BadMsg(self.request_xml)
return
if self.request.has_key('filter'):
if not self.request.has_key('class'):
self.rpc_response.is_error = True
self.rpc_response.node = ncerror.BadMsg(
self.request_xml)
return
# Verify that the requested schema exists
if not self.capabilities.is_schema_supported(self.request[
'identifier']) \
or self.request['format'] != 'yang' :
self.rpc_response.is_error = True
self.rpc_response.node = ncerror.BadMsg(self.request_xml)
return
except Exception as e:
self.rpc_response.is_error = True
self.rpc_response.node = ncerror.BadMsg(self.request)
return
def _extract_parameters(self):
try:
rpc_node = self.request_xml.find(''.join(
[qmap(C.VOLTHA), self.request['command']]))
# Parse rpc the parameters
self.request['params'] = self._parse_params(rpc_node)
# Remove the subclass element in the request if it is present as
# it is not required for rpc calls
if self.request.has_key('subclass'):
self.request.pop('subclass', None)
# Extract the service and method from the rpc command
command = self.request['command'].split('-')
if len(command) != 2:
log.debug('invalid-format', command=self.request['command'])
raise
self.service = command[0]
self.method = command[1]
if self.request.has_key('metadata'):
self.metadata = self.request['metadata']
except Exception as e:
self.rpc_response.is_error = True
self.rpc_response.node = ncerror.BadMsg(self.request_xml)
log.exception('params-parsing-error', xml=self.request_xml, e=e)
def _validate_parameters(self):
log.info('validate-parameters', session=self.session.session_id)
self.params = self.rpc_method.getchildren()
paramslen = len(self.params)
# Verify that the source parameter is present
if paramslen > 2:
# TODO: need to specify all elements not known
self.rpc_response.is_error = True
self.rpc_response.node = ncerror.BadMsg(self.rpc_request)
return
self.source_param = self.rpc_method.find(C.NC_SOURCE,
namespaces=C.NS_MAP)
# if self.source_param is None:
# self.rpc_response.is_error = True
# self.rpc_response.node = ncerror.MissingElement(
# self.rpc_request, elm(C.NC_SOURCE))
# return
self.filter_param = None
if paramslen == 2:
self.filter_param = self.rpc_method.find(C.NC_FILTER,
namespaces=C.NS_MAP)
if self.filter_param is None:
unknown_elm = self.params[0] if self.params[0] != \
self.source_param else \
self.params[1]
self.rpc_response.is_error = True
self.rpc_response.node = ncerror.UnknownElement(
self.rpc_request, unknown_elm)
self.params = [self.source_param, self.filter_param]
def _validate_parameters(self):
log.info('validate-parameters', session=self.session.session_id)
# Validate the GET command
if self.request:
try:
if self.request['command'] != 'get-schemas':
self.rpc_response.is_error = True
self.rpc_response.node = ncerror.BadMsg(self.request_xml)
return
if self.request.has_key('filter'):
if not self.request.has_key('class'):
self.rpc_response.is_error = True
self.rpc_response.node = ncerror.BadMsg(
self.request_xml)
return
except Exception as e:
self.rpc_response.is_error = True
self.rpc_response.node = ncerror.BadMsg(self.request)
return
def _validate_parameters(self):
if self.request:
try:
if self.request['command'] != 'close-session':
self.rpc_response.is_error = True
self.rpc_response.node = ncerror.BadMsg(self.request_xml)
return
except Exception as e:
self.rpc_response.is_error = True
self.rpc_response.node = ncerror.ServerException(
self.request_xml)
return
def _validate_parameters(self):
log.info('validate-parameters', session=self.session.session_id)
# For now just validate that the command is presenf
if self.request:
try:
if self.request['command'] is None:
self.rpc_response.is_error = True
self.rpc_response.node = ncerror.BadMsg(self.request_xml)
return
except Exception as e:
self.rpc_response.is_error = True
self.rpc_response.node = ncerror.ServerException(
self.request_xml)
return
def build_yang_response(self,
root,
request,
yang_options=None,
custom_rpc=False):
try:
self.custom_rpc = custom_rpc
yang_xml = self.to_yang_xml(root, request, yang_options,
custom_rpc)
log.info('yang-xml',
yang_xml=etree.tounicode(yang_xml, pretty_print=True))
return self.build_xml_response(request, yang_xml, custom_rpc)
except Exception as e:
log.exception('error-building-yang-response',
request=request,
xml=etree.tostring(root))
self.rpc_response.is_error = True
self.rpc_response.node = ncerror.BadMsg(request)
return
def execute(self):
if self.rpc_response.is_error:
returnValue(self.rpc_response)
log.info('get-schema-request',
session=self.session.session_id,
request=self.request)
# Get the yang schema content
# TODO: Use version as well
content = yield self.capabilities.get_schema_content(
self.request['identifier'])
if not content:
self.rpc_response.is_error = True
self.rpc_response.node = ncerror.BadMsg(self.request_xml)
returnValue(self.rpc_response)
self.rpc_response.node = yield self.create_xml_response(content)
self.rpc_response.is_error = False
returnValue(self.rpc_response)
def _validate_parameters(self):
for child in self.rpc_method.getchildren():
# There cannot be parameters to a close session request
self.rpc_response.is_error = True
self.rpc_response.node = ncerror.BadMsg(self.rpc_request)
return
def handle_request(self, msg):
if not self.session.session_opened:
return
# Any error with XML encoding here is going to cause a session close
try:
tree = etree.parse(io.BytesIO(msg.encode('utf-8')))
if not tree:
raise ncerror.SessionError(msg, "Invalid XML from client.")
except etree.XMLSyntaxError:
log.error("malformed-message", msg=msg)
try:
error = ncerror.BadMsg(msg)
self.send_message(error.get_reply_msg())
except AttributeError:
log.error("attribute-error", msg=msg)
# close session
self.close()
return
rpcs = tree.xpath(C.RPC_XPATH, namespaces=C.NS_MAP)
if not rpcs:
raise ncerror.SessionError(msg, "No rpc found")
# A message can have multiple rpc requests
rpc_factory = get_rpc_factory_instance()
for rpc in rpcs:
try:
# Validate message id is received
try:
msg_id = rpc.get(C.MESSAGE_ID)
log.info("Received-rpc-message-id", msg_id=msg_id)
except (TypeError, ValueError):
log.error('no-message-id', rpc=rpc)
raise ncerror.MissingElement(msg, C.MESSAGE_ID)
# Get a rpc handler
rpc_handler = rpc_factory.get_rpc_handler(
rpc, msg, self.grpc_client, self.session,
self.capabilities)
if rpc_handler:
# set the parameters for this handler
response = yield rpc_handler.execute()
log.info('handler',
rpc_handler=rpc_handler,
is_error=response.is_error,
custom_rpc=response.custom_rpc,
response=response)
if not response.is_error:
if response.custom_rpc:
self.send_custom_rpc_reply(response.node, rpc)
else:
self.send_rpc_reply(response.node, rpc)
# self.send_rpc_reply(self.get_mock_volthainstance(), rpc)
else:
self.send_message(response.node.get_xml_reply())
if response.close_session:
log.info('response-closing-session', response=response)
self.close()
else:
log.error('no-rpc-handler',
request=msg,
session_id=self.session.session_id)
error = ncerror.NotImpl(rpc)
self.send_message(error.get_xml_reply())
except ncerror.BadMsg as err:
log.info('ncerror.BadMsg')
if self.new_framing:
self.send_message(err.get_xml_reply())
else:
# If we are 1.0 we have to simply close the connection
# as we are not allowed to send this error
log.error("Closing-1-0-session--malformed-message")
self.close()
except (ncerror.NotImpl, ncerror.MissingElement) as e:
log.exception('error', e=e)
self.send_message(e.get_reply_msg())
except Exception as e:
log.exception('Exception', e=e)
error = ncerror.ServerException(rpc, e)
self.send_message(error.get_xml_reply())
