# -*- coding: utf-8 -*- # # Copyright (C) 2013 GNS3 Technologies Inc. # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . """ Set up and run the server. """ import zmq from zmq.eventloop import ioloop, zmqstream ioloop.install() import os import tempfile import signal import errno import functools import socket import tornado.ioloop import tornado.web import tornado.autoreload from .config import Config from .handlers.jsonrpc_websocket import JSONRPCWebSocket from .handlers.version_handler import VersionHandler from .handlers.file_upload_handler import FileUploadHandler from .module_manager import ModuleManager import logging log = logging.getLogger(__name__) class Server(object): # built-in handlers handlers = [(r"/version", VersionHandler), (r"/upload", FileUploadHandler)] def __init__(self, host, port, ipc=False): self._host = host self._port = port if ipc: self._zmq_port = 0 # this forces to use IPC for communications with the ZeroMQ server else: try: # let the OS find an unused port for the ZeroMQ server with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock: sock.bind(('127.0.0.1', 0)) self._zmq_port = sock.getsockname()[1] except socket.error as e: log.warn("could not pick up a random port for the ZeroMQ server: {}".format(e)) self._zmq_port = port + 1 # let's try this server port + 1 self._ipc = ipc self._modules = [] # get the projects and temp directories from the configuration file (passed to the modules) config = Config.instance() server_config = config.get_default_section() # default projects directory is "~/Documents/GNS3/projects" self._projects_dir = os.path.expandvars(os.path.expanduser(server_config.get("projects_directory", "~/Documents/GNS3/projects"))) self._temp_dir = server_config.get("temporary_directory", tempfile.gettempdir()) if not os.path.exists(self._projects_dir): try: os.makedirs(self._projects_dir) log.info("projects directory '{}' created".format(self._projects_dir)) except EnvironmentError as e: log.error("could not create the projects directory {}: {}".format(self._projects_dir, e)) def load_modules(self): """ Loads the modules. """ cwd = os.path.dirname(os.path.abspath(__file__)) module_path = os.path.join(cwd, 'modules') log.info("loading modules from {}".format(module_path)) module_manager = ModuleManager([module_path]) module_manager.load_modules() for module in module_manager.get_all_modules(): instance = module_manager.activate_module(module, "127.0.0.1", # ZeroMQ server address self._zmq_port, # ZeroMQ server port projects_dir=self._projects_dir, temp_dir=self._temp_dir) if not instance: continue self._modules.append(instance) destinations = instance.destinations() for destination in destinations: JSONRPCWebSocket.register_destination(destination, module.name) instance.start() # starts the new process def run(self): """ Starts the Tornado web server and ZeroMQ server. """ router = self._create_zmq_router() # Add our JSON-RPC Websocket handler to Tornado self.handlers.extend([(r"/", JSONRPCWebSocket, dict(zmq_router=router))]) tornado_app = tornado.web.Application(self.handlers, debug=True) # FIXME: debug mode! try: print("Starting server on port {}".format(self._port)) tornado_app.listen(self._port, address=self._host) except socket.error as e: if e.errno == errno.EADDRINUSE: # socket already in use logging.critical("socket in use for port {}".format(self._port)) raise SystemExit ioloop = tornado.ioloop.IOLoop.instance() stream = zmqstream.ZMQStream(router, ioloop) stream.on_recv_stream(JSONRPCWebSocket.dispatch_message) tornado.autoreload.add_reload_hook(functools.partial(self._cleanup, stop=False)) def signal_handler(signum=None, frame=None): log.warning("Server got signal {}, exiting...".format(signum)) self._cleanup() for sig in [signal.SIGTERM, signal.SIGINT, signal.SIGHUP, signal.SIGQUIT]: signal.signal(sig, signal_handler) try: ioloop.start() except (KeyboardInterrupt, SystemExit): print("\nExiting...") self._cleanup() def _create_zmq_router(self): """ Creates the ZeroMQ router socket to send requests to modules. :returns: ZeroMQ router socket """ context = zmq.Context() context.linger = 0 router = context.socket(zmq.ROUTER) if self._ipc: try: router.bind("ipc:///tmp/gns3.ipc") except zmq.error.ZMQError as e: log.critical("Could not start ZeroMQ server on ipc:///tmp/gns3.ipc, reason: {}".format(e)) self._cleanup() raise SystemExit log.info("ZeroMQ server listening to ipc:///tmp/gns3.ipc") else: try: router.bind("tcp://127.0.0.1:{}".format(self._zmq_port)) except zmq.error.ZMQError as e: log.critical("Could not start ZeroMQ server on 127.0.0.1:{}, reason: {}".format(self._zmq_port, e)) self._cleanup() raise SystemExit log.info("ZeroMQ server listening to 127.0.0.1:{}".format(self._zmq_port)) return router def _cleanup(self, stop=True): """ Shutdowns any running module processes and close remaining Tornado ioloop file descriptors :param stop: stops the ioloop if True (default) """ # terminate all modules for module in self._modules: module.join(timeout=1) if module.is_alive(): log.info("terminating {}".format(module.name)) module.terminate() module.join(timeout=1) ioloop = tornado.ioloop.IOLoop.instance() # close any fd that would have remained open... for fd in ioloop._handlers.keys(): try: os.close(fd) except Exception: pass if stop: ioloop.stop()