class documentation

class twisted.internet.abstract.FileDescriptor(_ConsumerMixin, _LogOwner): (source)

Known subclasses: twisted.internet.base.BasePort, twisted.internet.inotify.INotify, twisted.internet.process.ProcessReader, twisted.internet.process.ProcessWriter, twisted.internet.process.PTYProcess, twisted.internet.serialport.SerialPort, twisted.internet.serialport.SerialPort, twisted.internet.tcp.Connection, twisted.pair.tuntap.TuntapPort

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An object which can be operated on by select().

This is an abstract superclass of all objects which may be notified when they are readable or writable; e.g. they have a file-descriptor that is valid to be passed to select(2).

Instance Variable connected Undocumented
Instance Variable disconnected Undocumented
Instance Variable disconnecting Undocumented
Instance Variable dataBuffer Undocumented
Instance Variable offset Undocumented
Class Variable SEND_LIMIT Undocumented
Method __init__
Instance Variable reactor Undocumented
Method connectionLost The connection was lost.
Instance Variable producer Undocumented
Method writeSomeData Write as much as possible of the given data, immediately.
Method doRead Called when data is available for reading.
Method doWrite Called when data can be written.
Instance Variable producerPaused Undocumented
Method writeConnectionLost Undocumented
Method readConnectionLost Undocumented
Method getHost Undocumented
Method getPeer Undocumented
Method write Reliably write some data.
Method writeSequence Reliably write a sequence of data.
Method loseConnection Close the connection at the next available opportunity.
Method loseWriteConnection Undocumented
Method stopReading Stop waiting for read availability.
Method stopWriting Stop waiting for write availability.
Method startReading Start waiting for read availability.
Method startWriting Start waiting for write availability.
Class Variable bufferSize Undocumented
Method stopConsuming Stop consuming data.
Method resumeProducing Undocumented
Method pauseProducing Undocumented
Method stopProducing Undocumented
Method fileno File Descriptor number for select().
Instance Variable _writeDisconnecting Undocumented
Instance Variable _writeDisconnected Undocumented
Instance Variable _tempDataBuffer Undocumented
Instance Variable _tempDataLen Undocumented
Method _postLoseConnection Called after a loseConnection(), when all data has been written.
Method _closeWriteConnection Undocumented
Method _isSendBufferFull Determine whether the user-space send buffer for this transport is full or not.
Method _maybePauseProducer Possibly pause a producer, if there is one and the send buffer is full.

Inherited from _ConsumerMixin:

Instance Variable streamingProducer bool or int
Method registerProducer Register to receive data from a producer.
Method unregisterProducer Stop consuming data from a producer, without disconnecting.

Inherited from _LogOwner:

Method logPrefix Override this method to insert custom logging behavior. Its return value will be inserted in front of every line. It may be called more times than the number of output lines.
Method _getLogPrefix Determine the log prefix to use for messages related to applicationObject, which may or may not be an interfaces.ILoggingContext provider.
disconnected = (source)

Undocumented

(type: int)
_writeDisconnecting = (source)

Undocumented

(type: bool)
_writeDisconnected = (source)

Undocumented

(type: bool)
dataBuffer = (source)

Undocumented

(type: bytes)
offset = (source)

Undocumented

(type: int)
SEND_LIMIT = (source)

Undocumented

_tempDataBuffer = (source)

Undocumented

(type: list)
_tempDataLen = (source)

Undocumented

(type: int)
def connectionLost(self, reason): (source)

The connection was lost.

This is called when the connection on a selectable object has been lost. It will be called whether the connection was closed explicitly, an exception occurred in an event handler, or the other end of the connection closed it first.

Clean up state here, but make sure to call back up to FileDescriptor.

def writeSomeData(self, data): (source)

Write as much as possible of the given data, immediately.

This is called to invoke the lower-level writing functionality, such as a socket's send() method, or a file's write(); this method returns an integer or an exception. If an integer, it is the number of bytes written (possibly zero); if an exception, it indicates the connection was lost.

ParametersdataUndocumented (type: bytes)
def doWrite(self): (source)

Called when data can be written.

ReturnsNone on success, an exception or a negative integer on failure.
See Alsotwisted.internet.interfaces.IWriteDescriptor.doWrite.
producerPaused = (source)
def _postLoseConnection(self): (source)

Called after a loseConnection(), when all data has been written.

Whatever this returns is then returned by doWrite.

def _closeWriteConnection(self): (source)

Undocumented

def writeConnectionLost(self, reason): (source)

Undocumented

def readConnectionLost(self, reason): (source)

Undocumented

ParametersreasonUndocumented (type: failure.Failure)
def _isSendBufferFull(self): (source)

Determine whether the user-space send buffer for this transport is full or not.

When the buffer contains more than self.bufferSize bytes, it is considered full. This might be improved by considering the size of the kernel send buffer and how much of it is free.

ReturnsTrue if it is full, False otherwise.
def _maybePauseProducer(self): (source)

Possibly pause a producer, if there is one and the send buffer is full.

def write(self, data): (source)

Reliably write some data.

The data is buffered until the underlying file descriptor is ready for writing. If there is more than self.bufferSize data in the buffer and this descriptor has a registered streaming producer, its pauseProducing() method will be called.

ParametersdataUndocumented (type: bytes)
def writeSequence(self, iovec): (source)

Reliably write a sequence of data.

Currently, this is a convenience method roughly equivalent to:

    for chunk in iovec:
        fd.write(chunk)

It may have a more efficient implementation at a later time or in a different reactor.

As with the write() method, if a buffer size limit is reached and a streaming producer is registered, it will be paused until the buffered data is written to the underlying file descriptor.

ParametersiovecUndocumented (type: Iterable[bytes])
def loseConnection(self): (source)

Close the connection at the next available opportunity.

Call this to cause this FileDescriptor to lose its connection. It will first write any data that it has buffered.

If there is data buffered yet to be written, this method will cause the transport to lose its connection as soon as it's done flushing its write buffer. If you have a producer registered, the connection won't be closed until the producer is finished. Therefore, make sure you unregister your producer when it's finished, or the connection will never close.

def loseWriteConnection(self): (source)

Undocumented

def stopReading(self): (source)

Stop waiting for read availability.

Call this to remove this selectable from being notified when it is ready for reading.

def stopWriting(self): (source)

Stop waiting for write availability.

Call this to remove this selectable from being notified when it is ready for writing.

def startReading(self): (source)

Start waiting for read availability.

def startWriting(self): (source)

Start waiting for write availability.

Call this to have this FileDescriptor be notified whenever it is ready for writing.

bufferSize = (source)

Undocumented

def stopConsuming(self): (source)

Stop consuming data.

This is called when a producer has lost its connection, to tell the consumer to go lose its connection (and break potential circular references).

def resumeProducing(self): (source)

Undocumented

def pauseProducing(self): (source)

Undocumented

def stopProducing(self): (source)

Undocumented

def fileno(self): (source)

File Descriptor number for select().

This method must be overridden or assigned in subclasses to indicate a valid file descriptor for the operating system.

API Documentation for Twisted, generated by pydoctor 20.12.1 at 2021-02-28 19:53:36.