mirror of
https://github.com/GNS3/gns3-server
synced 2024-12-01 04:38:12 +00:00
268 lines
8.9 KiB
Python
268 lines
8.9 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2015 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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Set up and run the server.
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"""
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import os
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import sys
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import signal
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import asyncio
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import aiohttp
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import functools
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import types
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import time
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import atexit
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from .route import Route
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from .request_handler import RequestHandler
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from ..config import Config
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from ..hypervisor import MODULES
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from ..hypervisor.port_manager import PortManager
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# do not delete this import
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import gns3server.handlers
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import logging
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log = logging.getLogger(__name__)
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class WebServer:
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def __init__(self, host, port):
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self._host = host
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self._port = port
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self._loop = None
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self._handler = None
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self._start_time = time.time()
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self._port_manager = PortManager(host)
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@staticmethod
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def instance(host=None, port=None):
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"""
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Singleton to return only one instance of Server.
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:returns: instance of Server
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"""
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if not hasattr(WebServer, "_instance") or WebServer._instance is None:
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assert host is not None
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assert port is not None
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WebServer._instance = WebServer(host, port)
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return WebServer._instance
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@asyncio.coroutine
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def _run_application(self, handler, ssl_context=None):
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try:
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server = yield from self._loop.create_server(handler, self._host, self._port, ssl=ssl_context)
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except OSError as e:
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log.critical("Could not start the server: {}".format(e))
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self._loop.stop()
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return
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return server
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@asyncio.coroutine
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def shutdown_server(self):
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"""
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Cleanly shutdown the server.
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"""
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if self._handler:
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yield from self._handler.finish_connections()
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self._handler = None
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for module in MODULES:
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log.debug("Unloading module {}".format(module.__name__))
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m = module.instance()
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yield from m.unload()
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if self._port_manager.tcp_ports:
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log.warning("TCP ports are still used {}".format(self._port_manager.tcp_ports))
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if self._port_manager.udp_ports:
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log.warning("UDP ports are still used {}".format(self._port_manager.udp_ports))
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for task in asyncio.Task.all_tasks():
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task.cancel()
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self._loop.stop()
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def _signal_handling(self):
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def signal_handler(signame):
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log.warning("Server has got signal {}, exiting...".format(signame))
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asyncio.async(self.shutdown_server())
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signals = ["SIGTERM", "SIGINT"]
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if sys.platform.startswith("win"):
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signals.extend(["SIGBREAK"])
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else:
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signals.extend(["SIGHUP", "SIGQUIT"])
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for signal_name in signals:
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callback = functools.partial(signal_handler, signal_name)
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if sys.platform.startswith("win"):
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# add_signal_handler() is not yet supported on Windows
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signal.signal(getattr(signal, signal_name), callback)
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else:
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self._loop.add_signal_handler(getattr(signal, signal_name), callback)
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def _reload_hook(self):
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@asyncio.coroutine
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def reload():
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log.info("Reloading")
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yield from self.shutdown_server()
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os.execv(sys.executable, [sys.executable] + sys.argv)
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# code extracted from tornado
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for module in sys.hypervisor.values():
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# Some hypervisor play games with sys.hypervisor (e.g. email/__init__.py
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# in the standard library), and occasionally this can cause strange
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# failures in getattr. Just ignore anything that's not an ordinary
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# module.
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if not isinstance(module, types.ModuleType):
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continue
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path = getattr(module, "__file__", None)
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if not path:
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continue
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if path.endswith(".pyc") or path.endswith(".pyo"):
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path = path[:-1]
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modified = os.stat(path).st_mtime
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if modified > self._start_time:
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log.debug("File {} has been modified".format(path))
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asyncio.async(reload())
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self._loop.call_later(1, self._reload_hook)
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def _create_ssl_context(self, server_config):
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import ssl
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ssl_context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
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certfile = server_config["certfile"]
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certkey = server_config["certkey"]
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try:
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ssl_context.load_cert_chain(certfile, certkey)
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except FileNotFoundError:
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log.critical("Could not find the SSL certfile or certkey")
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raise SystemExit
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except ssl.SSLError as e:
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log.critical("SSL error: {}".format(e))
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raise SystemExit
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log.info("SSL is enabled")
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return ssl_context
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@asyncio.coroutine
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def start_shell(self):
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try:
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from ptpython.repl import embed
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except ImportError:
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log.error("Unable to start a shell: the ptpython module must be installed!")
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return
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yield from embed(globals(), locals(), return_asyncio_coroutine=True, patch_stdout=True)
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def _exit_handling(self):
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"""
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Makes sure the asyncio loop is closed.
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"""
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def close_asyncio_loop():
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loop = None
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try:
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loop = asyncio.get_event_loop()
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except AttributeError:
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pass
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if loop is not None:
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loop.close()
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atexit.register(close_asyncio_loop)
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def run(self):
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"""
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Starts the server.
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"""
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logger = logging.getLogger("asyncio")
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logger.setLevel(logging.ERROR)
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server_config = Config.instance().get_section_config("Server")
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if sys.platform.startswith("win"):
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# use the Proactor event loop on Windows
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loop = asyncio.ProactorEventLoop()
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# Add a periodic callback to give a chance to process signals on Windows
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# because asyncio.add_signal_handler() is not supported yet on that platform
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# otherwise the loop runs outside of signal module's ability to trap signals.
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def wakeup():
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loop.call_later(0.5, wakeup)
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loop.call_later(0.5, wakeup)
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asyncio.set_event_loop(loop)
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ssl_context = None
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if server_config.getboolean("ssl"):
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if sys.platform.startswith("win"):
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log.critical("SSL mode is not supported on Windows")
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raise SystemExit
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ssl_context = self._create_ssl_context(server_config)
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self._loop = asyncio.get_event_loop()
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# Asyncio will raise error if coroutine is not called
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self._loop.set_debug(True)
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for key, val in os.environ.items():
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log.debug("ENV %s=%s", key, val)
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app = aiohttp.web.Application()
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for method, route, handler in Route.get_routes():
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log.debug("Adding route: {} {}".format(method, route))
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app.router.add_route(method, route, handler)
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for module in MODULES:
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log.debug("Loading module {}".format(module.__name__))
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m = module.instance()
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m.port_manager = self._port_manager
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log.info("Starting server on {}:{}".format(self._host, self._port))
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self._handler = app.make_handler(handler=RequestHandler)
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server = self._run_application(self._handler, ssl_context)
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self._loop.run_until_complete(server)
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self._signal_handling()
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self._exit_handling()
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if server_config.getboolean("live"):
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log.info("Code live reload is enabled, watching for file changes")
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self._loop.call_later(1, self._reload_hook)
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if server_config.getboolean("shell"):
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asyncio.async(self.start_shell())
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try:
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self._loop.run_forever()
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except TypeError as e:
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# This is to ignore an asyncio.windows_events exception
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# on Windows when the process gets the SIGBREAK signal
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# TypeError: async() takes 1 positional argument but 3 were given
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log.warning("TypeError exception in the loop {}".format(e))
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finally:
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if self._handler and self._loop.is_running():
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self._loop.run_until_complete(self._handler.finish_connections())
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server.close()
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if self._loop.is_running():
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self._loop.run_until_complete(app.finish())
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