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gns3-server/gns3server/server.py

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# -*- coding: utf-8 -*-
#
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# 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 <http://www.gnu.org/licenses/>.
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"""
Set up and run the server.
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"""
import os
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import sys
import signal
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import asyncio
import aiohttp
import functools
import types
import time
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from .web.route import Route
from .config import Config
from .modules import MODULES
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from .modules.port_manager import PortManager
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# TODO: get rid of * have something generic to automatically import handlers so the routes can be found
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from gns3server.handlers import *
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import logging
log = logging.getLogger(__name__)
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class Server:
def __init__(self, host, port):
self._host = host
self._port = port
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self._loop = None
self._start_time = time.time()
self._port_manager = PortManager(host)
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@asyncio.coroutine
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def _run_application(self, app, ssl_context=None):
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try:
server = yield from self._loop.create_server(app.make_handler(), self._host, self._port, ssl=ssl_context)
except OSError as e:
log.critical("Could not start the server: {}".format(e))
self._loop.stop()
return
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return server
@asyncio.coroutine
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def _stop_application(self):
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"""
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Cleanup the modules (shutdown running emulators etc.)
"""
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for module in MODULES:
log.debug("Unloading module {}".format(module.__name__))
m = module.instance()
yield from m.unload()
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self._loop.stop()
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def _signal_handling(self):
@asyncio.coroutine
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def signal_handler(signame):
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log.warning("Server has got signal {}, exiting...".format(signame))
yield from self._stop_application()
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signals = ["SIGTERM", "SIGINT"]
if sys.platform.startswith("win"):
signals.extend(["SIGBREAK"])
else:
signals.extend(["SIGHUP", "SIGQUIT"])
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for signal_name in signals:
callback = functools.partial(asyncio.async, signal_handler(signal_name))
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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 _reload_hook(self):
@asyncio.coroutine
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def reload():
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log.info("Reloading")
yield from self._stop_application()
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os.execv(sys.executable, [sys.executable] + sys.argv)
# code extracted from tornado
for module in sys.modules.values():
# Some modules play games with sys.modules (e.g. email/__init__.py
# in the standard library), and occasionally this can cause strange
# failures in getattr. Just ignore anything that's not an ordinary
# module.
if not isinstance(module, types.ModuleType):
continue
path = getattr(module, "__file__", None)
if not path:
continue
if path.endswith(".pyc") or path.endswith(".pyo"):
path = path[:-1]
modified = os.stat(path).st_mtime
if modified > self._start_time:
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log.debug("File {} has been modified".format(path))
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):
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
return ssl_context
def run(self):
"""
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Starts the server.
"""
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logger = logging.getLogger("asyncio")
logger.setLevel(logging.WARNING)
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server_config = Config.instance().get_section_config("Server")
if sys.platform.startswith("win"):
# use the Proactor event loop on Windows
asyncio.set_event_loop(asyncio.ProactorEventLoop())
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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)
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self._loop = asyncio.get_event_loop()
app = aiohttp.web.Application()
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)
for module in MODULES:
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log.debug("Loading module {}".format(module.__name__))
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m = module.instance()
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._loop.run_until_complete(self._run_application(app, ssl_context))
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self._signal_handling()
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if server_config.getboolean("debug"):
log.info("Code live reload is enabled, watching for file changes")
self._loop.call_later(1, self._reload_hook)
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self._loop.run_forever()