twisted.internet.abstract.FileDescriptor(_ConsumerMixin, _LogOwner)class documentation
twisted.internet.abstractView Source (View In Hierarchy)
Known subclasses: twisted.internet._posixserialport.SerialPort, 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.tcp.Connection, twisted.pair.tuntap.TuntapPort
Implements interfaces: twisted.internet.interfaces.IConsumer, twisted.internet.interfaces.IHalfCloseableDescriptor, twisted.internet.interfaces.IPushProducer, twisted.internet.interfaces.IReadWriteDescriptor, twisted.internet.interfaces.ITransport
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).
|Method||connectionLost||The connection was lost.|
|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.|
|Method||writeConnectionLost||Indicates write connection was lost.|
|Method||readConnectionLost||Indicates read connection was lost.|
|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||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.|
|Method||stopConsuming||Stop consuming data.|
|Method||resumeProducing||Resume producing data.|
|Method||pauseProducing||Pause producing data.|
|Method||stopProducing||Stop producing data.|
|Method||fileno||File Descriptor number for select().|
|Method||_postLoseConnection||Called after a loseConnection(), when all data has been written.|
|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||producerPaused||A flag indicating whether the producer is currently paused. (type:
|Instance Variable||streamingProducer 0||A flag indicating whether the producer was registered as a streaming (ie
push) producer or not (ie a pull producer). This will determine whether
the consumer may ever need to pause and resume it, or if it can merely call
|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
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.
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.
Called when data is available for reading.
Subclasses must override this method. The result will be interpreted in the same way as a result of doWrite().
Called when data can be written.
Called after a loseConnection(), when all data has been written.
Whatever this returns is then returned by doWrite.
Indicates write connection was lost.
Indicates read connection was lost.
Determine whether the user-space send buffer for this transport is full or not.
When the buffer contains more than
it is considered full. This might be improved by considering the size of
the kernel send buffer and how much of it is free.
Possibly pause a producer, if there is one and the send buffer is full.
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.
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.
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.
Stop waiting for read availability.
Call this to remove this selectable from being notified when it is ready for reading.
Stop waiting for write availability.
Call this to remove this selectable from being notified when it is ready for writing.
Start waiting for read availability.
Start waiting for write availability.
Call this to have this FileDescriptor be notified whenever it is ready for writing.
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).
Resume producing data.
This tells a producer to re-add itself to the main loop and produce more data for its consumer.
Pause producing data.
Tells a producer that it has produced too much data to process for the time being, and to stop until resumeProducing() is called.
Stop producing data.
This tells a producer that its consumer has died, so it must stop producing data for good.
File Descriptor number for select().
This method must be overridden or assigned in subclasses to indicate a valid file descriptor for the operating system.