# -*- coding: utf-8 -*- # # Copyright (C) 2015 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 os import sys import signal import asyncio import aiohttp import aiohttp_cors import functools import time import atexit from .route import Route from ..config import Config from ..compute import MODULES from ..compute.port_manager import PortManager from ..compute.qemu import Qemu from ..controller import Controller from gns3server.utils.asyncio import asyncio_ensure_future # do not delete this import import gns3server.handlers import logging log = logging.getLogger(__name__) if not (aiohttp.__version__.startswith("2.2") or aiohttp.__version__.startswith("2.3")): raise RuntimeError("aiohttp 2.2.x or 2.3.x is required to run the GNS3 server") class WebServer: def __init__(self, host, port): self._host = host self._port = port self._loop = None self._handler = None self._server = None self._app = None self._start_time = time.time() self._running = False self._closing = False @staticmethod def instance(host=None, port=None): """ Singleton to return only one instance of Server. :returns: instance of Server """ if not hasattr(WebServer, "_instance") or WebServer._instance is None: assert host is not None assert port is not None WebServer._instance = WebServer(host, port) return WebServer._instance def _run_application(self, handler, ssl_context=None): try: srv = self._loop.create_server(handler, self._host, self._port, ssl=ssl_context) self._server, startup_res = self._loop.run_until_complete(asyncio.gather(srv, self._app.startup(), loop=self._loop)) except (RuntimeError, OSError, asyncio.CancelledError) as e: log.critical("Could not start the server: {}".format(e)) return False return True @asyncio.coroutine def shutdown_server(self): """ Cleanly shutdown the server. """ if not self._closing: self._closing = True else: log.warning("Close is already in progress") return if self._server: self._server.close() yield from self._server.wait_closed() if self._app: yield from self._app.shutdown() if self._handler: try: # aiohttp < 2.3 yield from self._handler.finish_connections(2) # Parameter is timeout except AttributeError: # aiohttp >= 2.3 yield from self._handler.shutdown(2) # Parameter is timeout if self._app: yield from self._app.cleanup() yield from Controller.instance().stop() for module in MODULES: log.debug("Unloading module {}".format(module.__name__)) m = module.instance() yield from m.unload() if PortManager.instance().tcp_ports: log.warning("TCP ports are still used {}".format(PortManager.instance().tcp_ports)) if PortManager.instance().udp_ports: log.warning("UDP ports are still used {}".format(PortManager.instance().udp_ports)) for task in asyncio.Task.all_tasks(): task.cancel() try: yield from asyncio.wait_for(task, 1) except BaseException: pass self._loop.stop() def _signal_handling(self): def signal_handler(signame, *args): log.warning("Server has got signal {}, exiting...".format(signame)) asyncio_ensure_future(self.shutdown_server()) signals = ["SIGTERM", "SIGINT"] if sys.platform.startswith("win"): signals.extend(["SIGBREAK"]) else: signals.extend(["SIGHUP", "SIGQUIT"]) for signal_name in signals: callback = functools.partial(signal_handler, signal_name) if sys.platform.startswith("win"): # add_signal_handler() is not yet supported on Windows signal.signal(getattr(signal, signal_name), callback) else: self._loop.add_signal_handler(getattr(signal, signal_name), callback) def _create_ssl_context(self, server_config): import ssl ssl_context = ssl.SSLContext(ssl.PROTOCOL_SSLv23) certfile = server_config["certfile"] certkey = server_config["certkey"] try: ssl_context.load_cert_chain(certfile, certkey) except FileNotFoundError: log.critical("Could not find the SSL certfile or certkey") raise SystemExit except ssl.SSLError as e: log.critical("SSL error: {}".format(e)) raise SystemExit log.info("SSL is enabled") return ssl_context @asyncio.coroutine def start_shell(self): try: from ptpython.repl import embed except ImportError: log.error("Unable to start a shell: the ptpython module must be installed!") return yield from embed(globals(), locals(), return_asyncio_coroutine=True, patch_stdout=True, history_filename=".gns3_shell_history") def _exit_handling(self): """ Makes sure the asyncio loop is closed. """ def close_asyncio_loop(): loop = None try: loop = asyncio.get_event_loop() except AttributeError: pass if loop is not None: loop.close() atexit.register(close_asyncio_loop) @asyncio.coroutine def _on_startup(self, *args): """ Called when the HTTP server start """ yield from Controller.instance().start() # Because with a large image collection # without md5sum already computed we start the # computing with server start asyncio_ensure_future(Qemu.instance().list_images()) def run(self): """ Starts the server. """ server_logger = logging.getLogger('aiohttp.server') # In debug mode we don't use the standard request log but a more complete in response.py if log.getEffectiveLevel() == logging.DEBUG: server_logger.setLevel(logging.CRITICAL) logger = logging.getLogger("asyncio") logger.setLevel(logging.ERROR) if sys.platform.startswith("win"): loop = asyncio.get_event_loop() # Add a periodic callback to give a chance to process signals on Windows # because asyncio.add_signal_handler() is not supported yet on that platform # otherwise the loop runs outside of signal module's ability to trap signals. def wakeup(): loop.call_later(0.5, wakeup) loop.call_later(0.5, wakeup) server_config = Config.instance().get_section_config("Server") ssl_context = None if server_config.getboolean("ssl"): if sys.platform.startswith("win"): log.critical("SSL mode is not supported on Windows") raise SystemExit ssl_context = self._create_ssl_context(server_config) self._loop = asyncio.get_event_loop() if log.getEffectiveLevel() == logging.DEBUG: # On debug version we enable info that # coroutine is not called in a way await/yield from self._loop.set_debug(True) for key, val in os.environ.items(): log.debug("ENV %s=%s", key, val) self._app = aiohttp.web.Application() # Background task started with the server self._app.on_startup.append(self._on_startup) # Allow CORS for this domains cors = aiohttp_cors.setup(self._app, defaults={ # Default web server for web gui dev "http://127.0.0.1:8080": aiohttp_cors.ResourceOptions(expose_headers="*", allow_headers="*"), "http://localhost:8080": aiohttp_cors.ResourceOptions(expose_headers="*", allow_headers="*"), "http://127.0.0.1:4200": aiohttp_cors.ResourceOptions(expose_headers="*", allow_headers="*"), "http://localhost:4200": aiohttp_cors.ResourceOptions(expose_headers="*", allow_headers="*"), "http://gns3.github.io": aiohttp_cors.ResourceOptions(expose_headers="*", allow_headers="*"), "https://gns3.github.io": aiohttp_cors.ResourceOptions(expose_headers="*", allow_headers="*") }) PortManager.instance().console_host = self._host for method, route, handler in Route.get_routes(): log.debug("Adding route: {} {}".format(method, route)) cors.add(self._app.router.add_route(method, route, handler)) for module in MODULES: log.debug("Loading module {}".format(module.__name__)) m = module.instance() m.port_manager = PortManager.instance() log.info("Starting server on {}:{}".format(self._host, self._port)) self._handler = self._app.make_handler() if self._run_application(self._handler, ssl_context) is False: self._loop.stop() return self._signal_handling() self._exit_handling() if server_config.getboolean("shell"): asyncio_ensure_future(self.start_shell()) try: self._loop.run_forever() except TypeError as e: # This is to ignore an asyncio.windows_events exception # on Windows when the process gets the SIGBREAK signal # TypeError: async() takes 1 positional argument but 3 were given log.warning("TypeError exception in the loop {}".format(e)) finally: if self._loop.is_running(): self._loop.run_until_complete(self.shutdown_server())