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# -*- test-case-name: twisted.test.test_internet -*- # Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. """ Select reactor """ import select import sys from errno import EBADF, EINTR from time import sleep from typing import Type from zope.interface import implementer from twisted.internet import posixbase from twisted.internet.interfaces import IReactorFDSet from twisted.python import log from twisted.python.runtime import platformType def win32select(r, w, e, timeout=None): """Win32 select wrapper.""" if not (r or w): # windows select() exits immediately when no sockets if timeout is None: timeout = 0.01 else: timeout = min(timeout, 0.001) sleep(timeout) return [], [], [] # windows doesn't process 'signals' inside select(), so we set a max # time or ctrl-c will never be recognized if timeout is None or timeout > 0.5: timeout = 0.5 r, w, e = select.select(r, w, w, timeout) return r, w + e, [] if platformType == "win32": _select = win32select else: _select = select.select try: from twisted.internet.win32eventreactor import _ThreadedWin32EventsMixin except ImportError: _extraBase: Type[object] = object else: _extraBase = _ThreadedWin32EventsMixin @implementer(IReactorFDSet) class SelectReactor(posixbase.PosixReactorBase, _extraBase): # type: ignore[misc,valid-type] """ A select() based reactor - runs on all POSIX platforms and on Win32. @ivar _reads: A set containing L{FileDescriptor} instances which will be checked for read events. @ivar _writes: A set containing L{FileDescriptor} instances which will be checked for writability. """ def __init__(self): """ Initialize file descriptor tracking dictionaries and the base class. """ self._reads = set() self._writes = set() posixbase.PosixReactorBase.__init__(self) def _preenDescriptors(self): log.msg("Malformed file descriptor found. Preening lists.") readers = list(self._reads) writers = list(self._writes) self._reads.clear() self._writes.clear() for selSet, selList in ((self._reads, readers), (self._writes, writers)): for selectable in selList: try: select.select([selectable], [selectable], [selectable], 0) except Exception as e: log.msg("bad descriptor %s" % selectable) self._disconnectSelectable(selectable, e, False) else: selSet.add(selectable) def doSelect(self, timeout): """ Run one iteration of the I/O monitor loop. This will run all selectables who had input or output readiness waiting for them. """ try: r, w, ignored = _select(self._reads, self._writes, [], timeout) except ValueError: # Possibly a file descriptor has gone negative? self._preenDescriptors() return except TypeError: # Something *totally* invalid (object w/o fileno, non-integral # result) was passed log.err() self._preenDescriptors() return except OSError as se: # select(2) encountered an error, perhaps while calling the fileno() # method of a socket. (Python 2.6 socket.error is an IOError # subclass, but on Python 2.5 and earlier it is not.) if se.args[0] in (0, 2): # windows does this if it got an empty list if (not self._reads) and (not self._writes): return else: raise elif se.args[0] == EINTR: return elif se.args[0] == EBADF: self._preenDescriptors() return else: # OK, I really don't know what's going on. Blow up. raise _drdw = self._doReadOrWrite _logrun = log.callWithLogger for selectables, method, fdset in ( (r, "doRead", self._reads), (w, "doWrite", self._writes), ): for selectable in selectables: # if this was disconnected in another thread, kill it. # ^^^^ --- what the !@#*? serious! -exarkun if selectable not in fdset: continue # This for pausing input when we're not ready for more. _logrun(selectable, _drdw, selectable, method) doIteration = doSelect def _doReadOrWrite(self, selectable, method): try: why = getattr(selectable, method)() except BaseException: why = sys.exc_info()[1] log.err() if why: self._disconnectSelectable(selectable, why, method == "doRead") def addReader(self, reader): """ Add a FileDescriptor for notification of data available to read. """ self._reads.add(reader) def addWriter(self, writer): """ Add a FileDescriptor for notification of data available to write. """ self._writes.add(writer) def removeReader(self, reader): """ Remove a Selectable for notification of data available to read. """ self._reads.discard(reader) def removeWriter(self, writer): """ Remove a Selectable for notification of data available to write. """ self._writes.discard(writer) def removeAll(self): return self._removeAll(self._reads, self._writes) def getReaders(self): return list(self._reads) def getWriters(self): return list(self._writes) def install(): """Configure the twisted mainloop to be run using the select() reactor.""" reactor = SelectReactor() from twisted.internet.main import installReactor installReactor(reactor) __all__ = ["install"]