t.i.p.PosixReactorBase(_SignalReactorMixin, _DisconnectSelectableMixin, ReactorBase) : class documentation

Part of twisted.internet.posixbase View Source View In Hierarchy

Known subclasses: twisted.internet._glibbase.GlibReactorBase, twisted.internet._threadedselect.ThreadedSelectReactor, twisted.internet.cfreactor.CFReactor, twisted.internet.epollreactor.EPollReactor, twisted.internet.gtkreactor.GtkReactor, twisted.internet.kqreactor.KQueueReactor, twisted.internet.pollreactor.PollReactor, twisted.internet.selectreactor.SelectReactor, twisted.internet.win32eventreactor.Win32Reactor

Implements interfaces: twisted.internet.interfaces.IReactorProcess, twisted.internet.interfaces.IReactorSocket, twisted.internet.interfaces.IReactorSSL, twisted.internet.interfaces.IReactorUNIX, twisted.internet.interfaces.IReactorUNIXDatagram

A basis for reactors that use file descriptors.
Method installWaker Install a `waker' to allow threads and signals to wake up the IO thread.
Method spawnProcess Spawn a process, with a process protocol.
Method listenUDP Connects a given DatagramProtocol to the given numeric UDP port.
Method listenMulticast Connects a given DatagramProtocol to the given numeric UDP port.
Method connectUNIX Connect a client protocol to a UNIX socket.
Method listenUNIX Listen on a UNIX socket.
Method listenUNIXDatagram Connects a given DatagramProtocol to the given path.
Method connectUNIXDatagram Connects a ConnectedDatagramProtocol instance to a path.
Method adoptStreamPort Create a new IListeningPort from an already-initialized socket.
Method adoptStreamConnection
Method adoptDatagramPort Add an existing listening SOCK_DGRAM socket to the reactor to monitor for read and write readiness.
Method listenTCP Undocumented
Method connectTCP Undocumented
Method connectSSL Connect a client Protocol to a remote SSL socket.
Method listenSSL Connects a given protocol factory to the given numeric TCP/IP port. The connection is a SSL one, using contexts created by the context factory.
Instance Variable _childWaker None or a reference to the _SIGCHLDWaker which is used to properly notice child process termination.
Method _handleSignals Extend the basic signal handling logic to also support handling SIGCHLD to know when to try to reap child processes.
Method _uninstallHandler If a child waker was created and installed, uninstall it now.
Method _removeAll Remove all readers and writers, and list of removed IReadDescriptors and IWriteDescriptors.

Inherited from _SignalReactorMixin:

Method startRunning Extend the base implementation in order to remember whether signal handlers should be installed later.
Method run Undocumented
Method mainLoop Undocumented
Instance Variable _installSignalHandlers A flag which indicates whether any signal handlers will be installed during startup. This includes handlers for SIGCHLD to monitor child processes, and SIGINT, SIGTERM, and SIGBREAK to stop the reactor. (type: bool)
Method _reallyStartRunning Extend the base implementation by also installing signal handlers, if self._installSignalHandlers is true.

Inherited from _DisconnectSelectableMixin:

Method _disconnectSelectable Utility function for disconnecting a selectable.

Inherited from ReactorBase:

Instance Variable running See IReactorCore.running
Method __init__ Undocumented
Method installResolver Undocumented
Method wakeUp Wake up the event loop.
Method doIteration Do one iteration over the readers and writers which have been added.
Method addReader Undocumented
Method addWriter Undocumented
Method removeReader Undocumented
Method removeWriter Undocumented
Method removeAll Undocumented
Method getReaders Undocumented
Method getWriters Undocumented
Method resolve Return a Deferred that will resolve a hostname.
Method stop See twisted.internet.interfaces.IReactorCore.stop.
Method crash See twisted.internet.interfaces.IReactorCore.crash.
Method sigInt Handle a SIGINT interrupt.
Method sigBreak Handle a SIGBREAK interrupt.
Method sigTerm Handle a SIGTERM interrupt.
Method disconnectAll Disconnect every reader, and writer in the system.
Method iterate See twisted.internet.interfaces.IReactorCore.iterate.
Method fireSystemEvent See twisted.internet.interfaces.IReactorCore.fireSystemEvent.
Method addSystemEventTrigger See twisted.internet.interfaces.IReactorCore.addSystemEventTrigger.
Method removeSystemEventTrigger See twisted.internet.interfaces.IReactorCore.removeSystemEventTrigger.
Method callWhenRunning See twisted.internet.interfaces.IReactorCore.callWhenRunning.
Method startRunning Method called when reactor starts: do some initialization and fire startup events.
Method callLater See twisted.internet.interfaces.IReactorTime.callLater.
Method getDelayedCalls No summary
Method timeout Determine the longest time the reactor may sleep (waiting on I/O notification, perhaps) before it must wake up to service a time-related event.
Method runUntilCurrent Run all pending timed calls.
Method callFromThread 0 See twisted.internet.interfaces.IReactorThreads.callFromThread.
Method getThreadPool See twisted.internet.interfaces.IReactorThreads.getThreadPool.
Method callInThread See twisted.internet.interfaces.IReactorThreads.callInThread.
Method suggestThreadPoolSize See twisted.internet.interfaces.IReactorThreads.suggestThreadPoolSize.
Method callFromThread Cause a function to be executed by the reactor thread.
Instance Variable _stopped A flag which is true between paired calls to reactor.run and reactor.stop. This should be replaced with an explicit state machine. (type: bool)
Instance Variable _justStopped A flag which is true between the time reactor.stop is called and the time the shutdown system event is fired. This is used to determine whether that event should be fired after each iteration through the mainloop. This should be replaced with an explicit state machine. (type: bool)
Instance Variable _started A flag which is true from the time reactor.run is called until the time reactor.run returns. This is used to prevent calls to reactor.run on a running reactor. This should be replaced with an explicit state machine. (type: bool)
Instance Variable _registerAsIOThread A flag controlling whether the reactor will register the thread it is running in as the I/O thread when it starts. If True, registration will be done, otherwise it will not be.
Method _reallyStartRunning Method called to transition to the running state. This should happen in the during startup event trigger phase.
Method _moveCallLaterSooner Undocumented
Method _cancelCallLater Undocumented
Method _insertNewDelayedCalls Undocumented
Method _checkProcessArgs Check for valid arguments and environment to spawnProcess.
Method _initThreads Undocumented
Method _initThreadPool Create the threadpool accessible with callFromThread.
Method _stopThreadPool No summary
_childWaker =
None or a reference to the _SIGCHLDWaker which is used to properly notice child process termination.
def installWaker(self): (source)
overrides twisted.internet.base.ReactorBase.installWaker
overridden in twisted.internet.cfreactor.CFReactor
Install a `waker' to allow threads and signals to wake up the IO thread.

We use the self-pipe trick (http://cr.yp.to/docs/selfpipe.html) to wake the reactor. On Windows we use a pair of sockets.

def _handleSignals(self): (source)
overrides twisted.internet.base._SignalReactorMixin._handleSignals
overridden in twisted.internet._glibbase.GlibReactorBase
Extend the basic signal handling logic to also support handling SIGCHLD to know when to try to reap child processes.
def _uninstallHandler(self): (source)
overrides twisted.internet.base.ReactorBase._uninstallHandler
If a child waker was created and installed, uninstall it now.

Since this disables reactor functionality and is only called when the reactor is stopping, it doesn't provide any directly useful functionality, but the cleanup of reactor-related process-global state that it does helps in unit tests involving multiple reactors and is generally just a nice thing.

def spawnProcess(self, processProtocol, executable, args=(), env={}, path=None, uid=None, gid=None, usePTY=0, childFDs=None): (source)
from twisted.internet.interfaces.IReactorProcess
Spawn a process, with a process protocol.
ParametersprocessProtocolAn object which will be notified of all events related to the created process. (type: IProcessProtocol provider)
executablethe file name to spawn - the full path should be used.
argsthe command line arguments to pass to the process; a sequence of strings. The first string should be the executable's name.
envthe environment variables to pass to the child process. The resulting behavior varies between platforms. If
  • env is not set:
    • On POSIX: pass an empty environment.
    • On Windows: pass os.environ.
  • env is None:
    • On POSIX: pass os.environ.
    • On Windows: pass os.environ.
  • env is a dict:
    • On POSIX: pass the key/value pairs in env as the complete environment.
    • On Windows: update os.environ with the key/value pairs in the dict before passing it. As a consequence of bug #1640, passing keys with empty values in an effort to unset environment variables won't unset them.
(type: a dict mapping str to str, or None.)
paththe path to run the subprocess in - defaults to the current directory.
uiduser ID to run the subprocess as. (Only available on POSIX systems.)
gidgroup ID to run the subprocess as. (Only available on POSIX systems.)
usePTYif true, run this process in a pseudo-terminal. optionally a tuple of (masterfd, slavefd, ttyname), in which case use those file descriptors. (Not available on all systems.)
childFDsA dictionary mapping file descriptors in the new child process to an integer or to the string 'r' or 'w'.

If the value is an integer, it specifies a file descriptor in the parent process which will be mapped to a file descriptor (specified by the key) in the child process. This is useful for things like inetd and shell-like file redirection.

If it is the string 'r', a pipe will be created and attached to the child at that file descriptor: the child will be able to write to that file descriptor and the parent will receive read notification via the IProcessProtocol.childDataReceived callback. This is useful for the child's stdout and stderr.

If it is the string 'w', similar setup to the previous case will occur, with the pipe being readable by the child instead of writeable. The parent process can write to that file descriptor using IProcessTransport.writeToChild. This is useful for the child's stdin.

If childFDs is not passed, the default behaviour is to use a mapping that opens the usual stdin/stdout/stderr pipes.

ReturnsAn object which provides IProcessTransport.
RaisesOSErrorRaised with errno EAGAIN or ENOMEM if there are insufficient system resources to create a new process.
See Alsotwisted.internet.protocol.ProcessProtocol
def listenUDP(self, port, protocol, interface='', maxPacketSize=8192): (source)
Connects a given DatagramProtocol to the given numeric UDP port.
Returnsobject conforming to IListeningPort.
def listenMulticast(self, port, protocol, interface='', maxPacketSize=8192, listenMultiple=False): (source)
Connects a given DatagramProtocol to the given numeric UDP port.

EXPERIMENTAL.

Returnsobject conforming to IListeningPort.
def connectUNIX(self, address, factory, timeout=30, checkPID=0): (source)
from twisted.internet.interfaces.IReactorUNIX
overridden in twisted.manhole.gladereactor.GladeReactor
Connect a client protocol to a UNIX socket.
Parametersaddressa path to a unix socket on the filesystem.
factorya twisted.internet.protocol.ClientFactory instance
timeoutnumber of seconds to wait before assuming the connection has failed.
checkPIDif True, check for a pid file to verify that a server is listening. If address is a Linux abstract namespace path, this must be False.
ReturnsAn object which provides IConnector.
def listenUNIX(self, address, factory, backlog=50, mode=438, wantPID=0): (source)
from twisted.internet.interfaces.IReactorUNIX
overridden in twisted.manhole.gladereactor.GladeReactor
Listen on a UNIX socket.
Parametersaddressa path to a unix socket on the filesystem.
factorya twisted.internet.protocol.Factory instance.
backlognumber of connections to allow in backlog.
modeThe mode (not umask) to set on the unix socket. See platform specific documentation for information about how this might affect connection attempts. (type: int)
wantPIDif True, create a pidfile for the socket. If address is a Linux abstract namespace path, this must be False.
ReturnsAn object which provides IListeningPort.
def listenUNIXDatagram(self, address, protocol, maxPacketSize=8192, mode=438): (source)
from twisted.internet.interfaces.IReactorUNIXDatagram
Connects a given DatagramProtocol to the given path.

EXPERIMENTAL.

Returnsobject conforming to IListeningPort.
def connectUNIXDatagram(self, address, protocol, maxPacketSize=8192, mode=438, bindAddress=None): (source)
from twisted.internet.interfaces.IReactorUNIXDatagram
Connects a ConnectedDatagramProtocol instance to a path.

EXPERIMENTAL.

def adoptStreamPort(self, fileDescriptor, addressFamily, factory): (source)
from twisted.internet.interfaces.IReactorSocket
Create a new IListeningPort from an already-initialized socket.

This just dispatches to a suitable port implementation (eg from IReactorTCP, etc) based on the specified addressFamily.

See Alsotwisted.internet.interfaces.IReactorSocket.adoptStreamPort
def adoptStreamConnection(self, fileDescriptor, addressFamily, factory): (source)
from twisted.internet.interfaces.IReactorSocket
See Alsotwisted.internet.interfaces.IReactorSocket.adoptStreamConnection
def adoptDatagramPort(self, fileDescriptor, addressFamily, protocol, maxPacketSize=8192): (source)
from twisted.internet.interfaces.IReactorSocket
Add an existing listening I{SOCK_DGRAM} socket to the reactor to
monitor for read and write readiness.

@param fileDescriptor: A file descriptor associated with a socket which
    is already bound to an address and marked as listening.  The socket
    must be set non-blocking.  Any additional flags (for example,
    close-on-exec) must also be set by application code.  Application
    code is responsible for closing the file descriptor, which may be
    done as soon as C{adoptDatagramPort} returns.
@type fileDescriptor: C{int}

@param addressFamily: The address family (or I{domain}) of the socket.
    For example, L{socket.AF_INET6}.
@type addressFamily: C{int}

@param protocol: A L{DatagramProtocol} instance to connect to
    a UDP transport.
@type protocol: L{DatagramProtocol}

@param maxPacketSize: The maximum packet size to accept.
@type maxPacketSize: C{int}

@return: An object providing L{IListeningPort}.

@raise L{UnsupportedAddressFamily}: If the given address family is not
    supported by this reactor, or not supported with the given socket
    type.

@raise UnsupportedSocketType: If the given socket type is not supported
    by this reactor, or not supported with the given socket type.
def listenTCP(self, port, factory, backlog=50, interface=''): (source)
overridden in twisted.manhole.gladereactor.GladeReactor
Undocumented
def connectTCP(self, host, port, factory, timeout=30, bindAddress=None): (source)
overridden in twisted.manhole.gladereactor.GladeReactor
Undocumented
def connectSSL(self, host, port, factory, contextFactory, timeout=30, bindAddress=None): (source)
from twisted.internet.interfaces.IReactorSSL
overridden in twisted.manhole.gladereactor.GladeReactor
Connect a client Protocol to a remote SSL socket.
Parametershosta host name
porta port number
factorya twisted.internet.protocol.ClientFactory instance
contextFactorya twisted.internet.ssl.ClientContextFactory object.
timeoutnumber of seconds to wait before assuming the connection has failed.
bindAddressa (host, port) tuple of local address to bind to, or None.
ReturnsAn object which provides IConnector.
def listenSSL(self, port, factory, contextFactory, backlog=50, interface=''): (source)
from twisted.internet.interfaces.IReactorSSL
overridden in twisted.manhole.gladereactor.GladeReactor
Connects a given protocol factory to the given numeric TCP/IP port. The connection is a SSL one, using contexts created by the context factory.
Parametersporta port number on which to listen
factorya twisted.internet.protocol.ServerFactory instance
contextFactorya twisted.internet.ssl.ContextFactory instance
backlogsize of the listen queue
interfacethe hostname to bind to, defaults to '' (all)
def _removeAll(self, readers, writers): (source)
Remove all readers and writers, and list of removed IReadDescriptors and IWriteDescriptors.

Meant for calling from subclasses, to implement removeAll, like:

 def removeAll(self):
     return self._removeAll(self._reads, self._writes)

where self._reads and self._writes are iterables.

API Documentation for Twisted, generated by pydoctor at 2014-05-12 18:27:00.