mirror of
https://github.com/janeczku/calibre-web
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544 lines
20 KiB
Python
544 lines
20 KiB
Python
# Author: Ovidiu Predescu
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# Date: July 2011
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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# Note: This module's docs are not currently extracted automatically,
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# so changes must be made manually to twisted.rst
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# TODO: refactor doc build process to use an appropriate virtualenv
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"""Bridges between the Twisted reactor and Tornado IOLoop.
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This module lets you run applications and libraries written for
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Twisted in a Tornado application. It can be used in two modes,
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depending on which library's underlying event loop you want to use.
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This module has been tested with Twisted versions 11.0.0 and newer.
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Twisted on Tornado
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------------------
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`TornadoReactor` implements the Twisted reactor interface on top of
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the Tornado IOLoop. To use it, simply call `install` at the beginning
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of the application::
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import tornado.platform.twisted
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tornado.platform.twisted.install()
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from twisted.internet import reactor
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When the app is ready to start, call `IOLoop.instance().start()`
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instead of `reactor.run()`.
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It is also possible to create a non-global reactor by calling
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`tornado.platform.twisted.TornadoReactor(io_loop)`. However, if
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the `IOLoop` and reactor are to be short-lived (such as those used in
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unit tests), additional cleanup may be required. Specifically, it is
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recommended to call::
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reactor.fireSystemEvent('shutdown')
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reactor.disconnectAll()
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before closing the `IOLoop`.
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Tornado on Twisted
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------------------
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`TwistedIOLoop` implements the Tornado IOLoop interface on top of the Twisted
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reactor. Recommended usage::
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from tornado.platform.twisted import TwistedIOLoop
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from twisted.internet import reactor
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TwistedIOLoop().install()
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# Set up your tornado application as usual using `IOLoop.instance`
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reactor.run()
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`TwistedIOLoop` always uses the global Twisted reactor.
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"""
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from __future__ import absolute_import, division, print_function, with_statement
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import datetime
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import functools
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import socket
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import twisted.internet.abstract
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from twisted.internet.posixbase import PosixReactorBase
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from twisted.internet.interfaces import \
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IReactorFDSet, IDelayedCall, IReactorTime, IReadDescriptor, IWriteDescriptor
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from twisted.python import failure, log
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from twisted.internet import error
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import twisted.names.cache
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import twisted.names.client
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import twisted.names.hosts
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import twisted.names.resolve
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from zope.interface import implementer
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from tornado.escape import utf8
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from tornado import gen
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import tornado.ioloop
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from tornado.log import app_log
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from tornado.netutil import Resolver
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from tornado.stack_context import NullContext, wrap
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from tornado.ioloop import IOLoop
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@implementer(IDelayedCall)
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class TornadoDelayedCall(object):
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"""DelayedCall object for Tornado."""
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def __init__(self, reactor, seconds, f, *args, **kw):
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self._reactor = reactor
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self._func = functools.partial(f, *args, **kw)
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self._time = self._reactor.seconds() + seconds
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self._timeout = self._reactor._io_loop.add_timeout(self._time,
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self._called)
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self._active = True
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def _called(self):
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self._active = False
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self._reactor._removeDelayedCall(self)
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try:
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self._func()
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except:
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app_log.error("_called caught exception", exc_info=True)
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def getTime(self):
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return self._time
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def cancel(self):
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self._active = False
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self._reactor._io_loop.remove_timeout(self._timeout)
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self._reactor._removeDelayedCall(self)
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def delay(self, seconds):
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self._reactor._io_loop.remove_timeout(self._timeout)
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self._time += seconds
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self._timeout = self._reactor._io_loop.add_timeout(self._time,
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self._called)
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def reset(self, seconds):
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self._reactor._io_loop.remove_timeout(self._timeout)
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self._time = self._reactor.seconds() + seconds
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self._timeout = self._reactor._io_loop.add_timeout(self._time,
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self._called)
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def active(self):
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return self._active
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@implementer(IReactorTime, IReactorFDSet)
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class TornadoReactor(PosixReactorBase):
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"""Twisted reactor built on the Tornado IOLoop.
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Since it is intented to be used in applications where the top-level
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event loop is ``io_loop.start()`` rather than ``reactor.run()``,
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it is implemented a little differently than other Twisted reactors.
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We override `mainLoop` instead of `doIteration` and must implement
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timed call functionality on top of `IOLoop.add_timeout` rather than
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using the implementation in `PosixReactorBase`.
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"""
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def __init__(self, io_loop=None):
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if not io_loop:
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io_loop = tornado.ioloop.IOLoop.current()
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self._io_loop = io_loop
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self._readers = {} # map of reader objects to fd
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self._writers = {} # map of writer objects to fd
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self._fds = {} # a map of fd to a (reader, writer) tuple
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self._delayedCalls = {}
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PosixReactorBase.__init__(self)
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self.addSystemEventTrigger('during', 'shutdown', self.crash)
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# IOLoop.start() bypasses some of the reactor initialization.
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# Fire off the necessary events if they weren't already triggered
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# by reactor.run().
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def start_if_necessary():
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if not self._started:
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self.fireSystemEvent('startup')
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self._io_loop.add_callback(start_if_necessary)
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# IReactorTime
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def seconds(self):
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return self._io_loop.time()
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def callLater(self, seconds, f, *args, **kw):
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dc = TornadoDelayedCall(self, seconds, f, *args, **kw)
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self._delayedCalls[dc] = True
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return dc
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def getDelayedCalls(self):
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return [x for x in self._delayedCalls if x._active]
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def _removeDelayedCall(self, dc):
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if dc in self._delayedCalls:
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del self._delayedCalls[dc]
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# IReactorThreads
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def callFromThread(self, f, *args, **kw):
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"""See `twisted.internet.interfaces.IReactorThreads.callFromThread`"""
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assert callable(f), "%s is not callable" % f
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with NullContext():
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# This NullContext is mainly for an edge case when running
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# TwistedIOLoop on top of a TornadoReactor.
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# TwistedIOLoop.add_callback uses reactor.callFromThread and
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# should not pick up additional StackContexts along the way.
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self._io_loop.add_callback(f, *args, **kw)
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# We don't need the waker code from the super class, Tornado uses
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# its own waker.
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def installWaker(self):
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pass
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def wakeUp(self):
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pass
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# IReactorFDSet
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def _invoke_callback(self, fd, events):
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if fd not in self._fds:
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return
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(reader, writer) = self._fds[fd]
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if reader:
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err = None
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if reader.fileno() == -1:
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err = error.ConnectionLost()
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elif events & IOLoop.READ:
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err = log.callWithLogger(reader, reader.doRead)
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if err is None and events & IOLoop.ERROR:
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err = error.ConnectionLost()
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if err is not None:
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self.removeReader(reader)
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reader.readConnectionLost(failure.Failure(err))
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if writer:
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err = None
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if writer.fileno() == -1:
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err = error.ConnectionLost()
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elif events & IOLoop.WRITE:
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err = log.callWithLogger(writer, writer.doWrite)
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if err is None and events & IOLoop.ERROR:
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err = error.ConnectionLost()
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if err is not None:
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self.removeWriter(writer)
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writer.writeConnectionLost(failure.Failure(err))
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def addReader(self, reader):
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"""Add a FileDescriptor for notification of data available to read."""
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if reader in self._readers:
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# Don't add the reader if it's already there
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return
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fd = reader.fileno()
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self._readers[reader] = fd
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if fd in self._fds:
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(_, writer) = self._fds[fd]
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self._fds[fd] = (reader, writer)
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if writer:
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# We already registered this fd for write events,
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# update it for read events as well.
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self._io_loop.update_handler(fd, IOLoop.READ | IOLoop.WRITE)
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else:
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with NullContext():
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self._fds[fd] = (reader, None)
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self._io_loop.add_handler(fd, self._invoke_callback,
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IOLoop.READ)
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def addWriter(self, writer):
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"""Add a FileDescriptor for notification of data available to write."""
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if writer in self._writers:
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return
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fd = writer.fileno()
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self._writers[writer] = fd
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if fd in self._fds:
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(reader, _) = self._fds[fd]
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self._fds[fd] = (reader, writer)
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if reader:
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# We already registered this fd for read events,
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# update it for write events as well.
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self._io_loop.update_handler(fd, IOLoop.READ | IOLoop.WRITE)
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else:
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with NullContext():
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self._fds[fd] = (None, writer)
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self._io_loop.add_handler(fd, self._invoke_callback,
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IOLoop.WRITE)
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def removeReader(self, reader):
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"""Remove a Selectable for notification of data available to read."""
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if reader in self._readers:
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fd = self._readers.pop(reader)
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(_, writer) = self._fds[fd]
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if writer:
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# We have a writer so we need to update the IOLoop for
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# write events only.
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self._fds[fd] = (None, writer)
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self._io_loop.update_handler(fd, IOLoop.WRITE)
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else:
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# Since we have no writer registered, we remove the
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# entry from _fds and unregister the handler from the
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# IOLoop
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del self._fds[fd]
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self._io_loop.remove_handler(fd)
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def removeWriter(self, writer):
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"""Remove a Selectable for notification of data available to write."""
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if writer in self._writers:
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fd = self._writers.pop(writer)
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(reader, _) = self._fds[fd]
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if reader:
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# We have a reader so we need to update the IOLoop for
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# read events only.
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self._fds[fd] = (reader, None)
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self._io_loop.update_handler(fd, IOLoop.READ)
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else:
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# Since we have no reader registered, we remove the
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# entry from the _fds and unregister the handler from
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# the IOLoop.
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del self._fds[fd]
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self._io_loop.remove_handler(fd)
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def removeAll(self):
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return self._removeAll(self._readers, self._writers)
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def getReaders(self):
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return self._readers.keys()
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def getWriters(self):
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return self._writers.keys()
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# The following functions are mainly used in twisted-style test cases;
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# it is expected that most users of the TornadoReactor will call
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# IOLoop.start() instead of Reactor.run().
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def stop(self):
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PosixReactorBase.stop(self)
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fire_shutdown = functools.partial(self.fireSystemEvent, "shutdown")
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self._io_loop.add_callback(fire_shutdown)
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def crash(self):
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PosixReactorBase.crash(self)
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self._io_loop.stop()
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def doIteration(self, delay):
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raise NotImplementedError("doIteration")
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def mainLoop(self):
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self._io_loop.start()
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class _TestReactor(TornadoReactor):
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"""Subclass of TornadoReactor for use in unittests.
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This can't go in the test.py file because of import-order dependencies
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with the Twisted reactor test builder.
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"""
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def __init__(self):
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# always use a new ioloop
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super(_TestReactor, self).__init__(IOLoop())
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def listenTCP(self, port, factory, backlog=50, interface=''):
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# default to localhost to avoid firewall prompts on the mac
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if not interface:
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interface = '127.0.0.1'
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return super(_TestReactor, self).listenTCP(
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port, factory, backlog=backlog, interface=interface)
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def listenUDP(self, port, protocol, interface='', maxPacketSize=8192):
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if not interface:
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interface = '127.0.0.1'
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return super(_TestReactor, self).listenUDP(
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port, protocol, interface=interface, maxPacketSize=maxPacketSize)
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def install(io_loop=None):
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"""Install this package as the default Twisted reactor."""
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if not io_loop:
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io_loop = tornado.ioloop.IOLoop.current()
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reactor = TornadoReactor(io_loop)
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from twisted.internet.main import installReactor
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installReactor(reactor)
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return reactor
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@implementer(IReadDescriptor, IWriteDescriptor)
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class _FD(object):
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def __init__(self, fd, handler):
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self.fd = fd
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self.handler = handler
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self.reading = False
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self.writing = False
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self.lost = False
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def fileno(self):
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return self.fd
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def doRead(self):
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if not self.lost:
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self.handler(self.fd, tornado.ioloop.IOLoop.READ)
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def doWrite(self):
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if not self.lost:
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self.handler(self.fd, tornado.ioloop.IOLoop.WRITE)
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def connectionLost(self, reason):
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if not self.lost:
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self.handler(self.fd, tornado.ioloop.IOLoop.ERROR)
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self.lost = True
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def logPrefix(self):
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return ''
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class TwistedIOLoop(tornado.ioloop.IOLoop):
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"""IOLoop implementation that runs on Twisted.
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Uses the global Twisted reactor by default. To create multiple
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`TwistedIOLoops` in the same process, you must pass a unique reactor
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when constructing each one.
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Not compatible with `tornado.process.Subprocess.set_exit_callback`
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because the ``SIGCHLD`` handlers used by Tornado and Twisted conflict
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with each other.
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"""
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def initialize(self, reactor=None):
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if reactor is None:
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import twisted.internet.reactor
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reactor = twisted.internet.reactor
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self.reactor = reactor
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self.fds = {}
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self.reactor.callWhenRunning(self.make_current)
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def close(self, all_fds=False):
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self.reactor.removeAll()
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for c in self.reactor.getDelayedCalls():
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c.cancel()
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def add_handler(self, fd, handler, events):
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if fd in self.fds:
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raise ValueError('fd %d added twice' % fd)
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self.fds[fd] = _FD(fd, wrap(handler))
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if events & tornado.ioloop.IOLoop.READ:
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self.fds[fd].reading = True
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self.reactor.addReader(self.fds[fd])
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if events & tornado.ioloop.IOLoop.WRITE:
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self.fds[fd].writing = True
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self.reactor.addWriter(self.fds[fd])
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def update_handler(self, fd, events):
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if events & tornado.ioloop.IOLoop.READ:
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if not self.fds[fd].reading:
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self.fds[fd].reading = True
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self.reactor.addReader(self.fds[fd])
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else:
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if self.fds[fd].reading:
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self.fds[fd].reading = False
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self.reactor.removeReader(self.fds[fd])
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if events & tornado.ioloop.IOLoop.WRITE:
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if not self.fds[fd].writing:
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self.fds[fd].writing = True
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self.reactor.addWriter(self.fds[fd])
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else:
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if self.fds[fd].writing:
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self.fds[fd].writing = False
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self.reactor.removeWriter(self.fds[fd])
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def remove_handler(self, fd):
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if fd not in self.fds:
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return
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self.fds[fd].lost = True
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if self.fds[fd].reading:
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self.reactor.removeReader(self.fds[fd])
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if self.fds[fd].writing:
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self.reactor.removeWriter(self.fds[fd])
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del self.fds[fd]
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def start(self):
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self.reactor.run()
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def stop(self):
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self.reactor.crash()
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def _run_callback(self, callback, *args, **kwargs):
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try:
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callback(*args, **kwargs)
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except Exception:
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self.handle_callback_exception(callback)
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def add_timeout(self, deadline, callback):
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if isinstance(deadline, (int, long, float)):
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delay = max(deadline - self.time(), 0)
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elif isinstance(deadline, datetime.timedelta):
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delay = tornado.ioloop._Timeout.timedelta_to_seconds(deadline)
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else:
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raise TypeError("Unsupported deadline %r")
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return self.reactor.callLater(delay, self._run_callback, wrap(callback))
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def remove_timeout(self, timeout):
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if timeout.active():
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timeout.cancel()
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def add_callback(self, callback, *args, **kwargs):
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self.reactor.callFromThread(self._run_callback,
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wrap(callback), *args, **kwargs)
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def add_callback_from_signal(self, callback, *args, **kwargs):
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self.add_callback(callback, *args, **kwargs)
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class TwistedResolver(Resolver):
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"""Twisted-based asynchronous resolver.
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This is a non-blocking and non-threaded resolver. It is
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recommended only when threads cannot be used, since it has
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limitations compared to the standard ``getaddrinfo``-based
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`~tornado.netutil.Resolver` and
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`~tornado.netutil.ThreadedResolver`. Specifically, it returns at
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most one result, and arguments other than ``host`` and ``family``
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are ignored. It may fail to resolve when ``family`` is not
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``socket.AF_UNSPEC``.
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Requires Twisted 12.1 or newer.
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"""
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def initialize(self, io_loop=None):
|
|
self.io_loop = io_loop or IOLoop.current()
|
|
# partial copy of twisted.names.client.createResolver, which doesn't
|
|
# allow for a reactor to be passed in.
|
|
self.reactor = tornado.platform.twisted.TornadoReactor(io_loop)
|
|
|
|
host_resolver = twisted.names.hosts.Resolver('/etc/hosts')
|
|
cache_resolver = twisted.names.cache.CacheResolver(reactor=self.reactor)
|
|
real_resolver = twisted.names.client.Resolver('/etc/resolv.conf',
|
|
reactor=self.reactor)
|
|
self.resolver = twisted.names.resolve.ResolverChain(
|
|
[host_resolver, cache_resolver, real_resolver])
|
|
|
|
@gen.coroutine
|
|
def resolve(self, host, port, family=0):
|
|
# getHostByName doesn't accept IP addresses, so if the input
|
|
# looks like an IP address just return it immediately.
|
|
if twisted.internet.abstract.isIPAddress(host):
|
|
resolved = host
|
|
resolved_family = socket.AF_INET
|
|
elif twisted.internet.abstract.isIPv6Address(host):
|
|
resolved = host
|
|
resolved_family = socket.AF_INET6
|
|
else:
|
|
deferred = self.resolver.getHostByName(utf8(host))
|
|
resolved = yield gen.Task(deferred.addCallback)
|
|
if twisted.internet.abstract.isIPAddress(resolved):
|
|
resolved_family = socket.AF_INET
|
|
elif twisted.internet.abstract.isIPv6Address(resolved):
|
|
resolved_family = socket.AF_INET6
|
|
else:
|
|
resolved_family = socket.AF_UNSPEC
|
|
if family != socket.AF_UNSPEC and family != resolved_family:
|
|
raise Exception('Requested socket family %d but got %d' %
|
|
(family, resolved_family))
|
|
result = [
|
|
(resolved_family, (resolved, port)),
|
|
]
|
|
raise gen.Return(result)
|