twisted.internet.interfaces.IHalfCloseableProtocol

class IHalfCloseableProtocol(Interface): (source)

Implemented to indicate they want notification of half-closes.

TCP supports the notion of half-closing the connection, e.g. closing the write side but still not stopping reading. A protocol that implements this interface will be notified of such events, instead of having connectionLost called.

Method	`readConnectionLost`	Notification of the read connection being closed.
Method	`writeConnectionLost`	Notification of the write connection being closed.

def readConnectionLost(): (source)

Notification of the read connection being closed.

This indicates peer did half-close of write side. It is now the responsibility of the this protocol to call loseConnection(). In addition, the protocol MUST make sure a reference to it still exists (i.e. by doing a callLater with one of its methods, etc.) as the reactor will only have a reference to it if it is writing.

If the protocol does not do so, it might get garbage collected without the connectionLost method ever being called.

def writeConnectionLost(): (source)

Notification of the write connection being closed.

This will never be called for TCP connections as TCP does not support notification of this type of half-close.