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331 lines
11 KiB
331 lines
11 KiB
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2013 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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Base class (interface) for modules
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"""
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import sys
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import traceback
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import gns3server.jsonrpc as jsonrpc
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import multiprocessing
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import zmq
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import signal
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from jsonschema import validate, ValidationError
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import logging
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log = logging.getLogger(__name__)
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class IModule(multiprocessing.Process):
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"""
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Module interface.
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:param name: module name
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:param args: arguments for the module
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:param kwargs: named arguments for the module
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"""
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modules = {}
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def __init__(self, name, *args, **kwargs):
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multiprocessing.Process.__init__(self, name=name)
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self._context = None
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self._ioloop = None
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self._stream = None
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self._dealer = None
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self._zmq_host = args[0] # ZeroMQ server address
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self._zmq_port = args[1] # ZeroMQ server port
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self._current_session = None
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self._current_destination = None
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self._current_call_id = None
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self._stopping = False
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def _setup(self):
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"""
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Sets up PyZMQ and creates the stream to handle requests
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"""
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self._context = zmq.Context()
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self._ioloop = zmq.eventloop.ioloop.IOLoop.instance()
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self._stream = self._create_stream(self._zmq_host, self._zmq_port, self._decode_request)
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def _create_stream(self, host=None, port=0, callback=None):
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"""
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Creates a new ZMQ stream.
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:returns: ZMQ stream instance
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"""
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self._dealer = self._context.socket(zmq.DEALER)
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self._dealer.setsockopt(zmq.IDENTITY, self.name.encode("utf-8"))
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if host and port:
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log.info("ZeroMQ client ({}) connecting to {}:{}".format(self.name, host, port))
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try:
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self._dealer.connect("tcp://{}:{}".format(host, port))
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except zmq.error.ZMQError as e:
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log.critical("Could not connect to ZeroMQ server on {}:{}, reason: {}".format(host, port, e))
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raise SystemExit
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else:
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log.info("ZeroMQ client ({}) connecting to ipc:///tmp/gns3.ipc".format(self.name))
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try:
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self._dealer.connect("ipc:///tmp/gns3.ipc")
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except zmq.error.ZMQError as e:
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log.critical("Could not connect to ZeroMQ server on ipc:///tmp/gns3.ipc, reason: {}".format(e))
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raise SystemExit
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stream = zmq.eventloop.zmqstream.ZMQStream(self._dealer, self._ioloop)
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if callback:
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stream.on_recv(callback)
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return stream
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def add_periodic_callback(self, callback, time):
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"""
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Adds a periodic callback to the ioloop.
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:param callback: callback to be called
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:param time: frequency when the callback is executed
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"""
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periodic_callback = zmq.eventloop.ioloop.PeriodicCallback(callback, time, self._ioloop)
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return periodic_callback
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def run(self):
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"""
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Starts the event loop
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"""
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def signal_handler(signum=None, frame=None):
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log.warning("Module {} got signal {}, exiting...".format(self.name, signum))
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self.stop(signum)
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signals = [signal.SIGTERM, signal.SIGINT]
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if not sys.platform.startswith("win"):
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signals.extend([signal.SIGHUP, signal.SIGQUIT])
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else:
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signals.extend([signal.SIGBREAK])
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for sig in signals:
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signal.signal(sig, signal_handler)
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log.info("{} module running with PID {}".format(self.name, self.pid))
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self._setup()
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try:
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self._ioloop.start()
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except KeyboardInterrupt:
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return
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log.info("{} module has stopped".format(self.name))
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def _shutdown(self):
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"""
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Shutdowns the I/O loop and the ZeroMQ stream & socket
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"""
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self._ioloop.stop()
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if self._stream and not self._stream.closed:
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# close the zeroMQ stream
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self._stream.close()
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if self._dealer and not self._dealer.closed:
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# close the ZeroMQ dealer socket
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self._dealer.close()
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def stop(self, signum=None):
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"""
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Adds a callback to stop the event loop & ZeroMQ.
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:param signum: signal number (if called by the signal handler)
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"""
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if not self._stopping:
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self._stopping = True
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if signum:
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self._ioloop.add_callback_from_signal(self._shutdown)
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else:
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self._ioloop.add_callback(self._shutdown)
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def send_response(self, results):
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"""
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Sends a response back to the requester.
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:param results: JSON results to the ZeroMQ server
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"""
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jsonrpc_response = jsonrpc.JSONRPCResponse(results, self._current_call_id)()
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# add session to the response
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response = [self._current_session, jsonrpc_response]
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log.debug("ZeroMQ client ({}) sending: {}".format(self.name, response))
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self._stream.send_json(response)
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def send_param_error(self):
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"""
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Sends a param error back to the requester.
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"""
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jsonrpc_response = jsonrpc.JSONRPCInvalidParams(self._current_call_id)()
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# add session to the response
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response = [self._current_session, jsonrpc_response]
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log.info("ZeroMQ client ({}) sending JSON-RPC param error for call id {}".format(self.name, self._current_call_id))
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self._stream.send_json(response)
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def send_internal_error(self):
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"""
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Sends a param error back to the requester.
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"""
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jsonrpc_response = jsonrpc.JSONRPCInternalError()()
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# add session to the response
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response = [self._current_session, jsonrpc_response]
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log.critical("ZeroMQ client ({}) sending JSON-RPC internal error".format(self.name))
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self._stream.send_json(response)
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def send_custom_error(self, message, code=-3200):
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"""
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Sends a custom error back to the requester.
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"""
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jsonrpc_response = jsonrpc.JSONRPCCustomError(code, message, self._current_call_id)()
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# add session to the response
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response = [self._current_session, jsonrpc_response]
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log.info("ZeroMQ client ({}) sending JSON-RPC custom error: {} for call id {}".format(self.name,
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message,
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self._current_call_id))
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self._stream.send_json(response)
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def send_notification(self, destination, results):
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"""
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Sends a notification
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:param destination: destination (or method)
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:param results: JSON results to the ZeroMQ router
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"""
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jsonrpc_response = jsonrpc.JSONRPCNotification(destination, results)()
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# add session to the response
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response = [self._current_session, jsonrpc_response]
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log.debug("ZeroMQ client ({}) sending: {}".format(self.name, response))
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self._stream.send_json(response)
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def _decode_request(self, request):
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"""
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Decodes the request to JSON.
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:param request: request from ZeroMQ server
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"""
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# server is shutting down, do not process
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# more request
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if self._stopping:
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return
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# handle special request to stop the module
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# e.g. useful on Windows where the
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# SIGBREAK signal cound't be propagated
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if request[0] == b"stop":
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self.stop()
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return
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try:
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request = zmq.utils.jsonapi.loads(request[0])
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except ValueError:
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self._current_session = None
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self.send_internal_error()
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return
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log.debug("ZeroMQ client ({}) received: {}".format(self.name, request))
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self._current_session = request[0]
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self._current_call_id = request[1].get("id")
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destination = request[1].get("method")
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params = request[1].get("params")
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if destination not in self.modules[self.name]:
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self.send_internal_error()
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return
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log.debug("Routing request to {}: {}".format(destination, request[1]))
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try:
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self.modules[self.name][destination](self, params)
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except Exception as e:
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log.error("uncaught exception {type}".format(type=type(e)), exc_info=1)
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exc_type, exc_value, exc_tb = sys.exc_info()
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lines = traceback.format_exception(exc_type, exc_value, exc_tb)
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tb = "".join(lines)
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self.send_custom_error("uncaught exception {type}: {string}\n{tb}".format(type=type(e),
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string=str(e),
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tb=tb))
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def validate_request(self, request, schema):
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"""
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Validates a request.
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:param request: request (JSON-RPC params)
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:param schema: JSON-SCHEMA to validate the request
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:returns: True or False
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"""
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# check if we have a request
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if request is None:
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self.send_param_error()
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return False
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log.debug("received request {}".format(request))
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# validate the request
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try:
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validate(request, schema)
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except ValidationError as e:
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self.send_custom_error("request validation error: {}".format(e))
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return False
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return True
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def destinations(self):
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"""
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Destinations handled by this module.
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:returns: list of destinations
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"""
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if not self.name in self.modules:
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log.warn("no destinations found for module {}".format(self.name))
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return []
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return self.modules[self.name].keys()
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@classmethod
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def route(cls, destination):
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"""
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Decorator to register a destination routed to a method
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:param destination: destination to be routed
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"""
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def wrapper(method):
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module = destination.split(".")[0]
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if not module in cls.modules:
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cls.modules[module] = {}
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cls.modules[module][destination] = method
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return method
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return wrapper
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