class twisted.internet.utils._BackRelay(protocol.ProcessProtocol): (source)
Trivial protocol for communicating with a process and turning its output into the result of a Deferred.
| Instance Variable | deferred | A Deferred which will be called back with all of stdout and, if errortoo is true, all of stderr as well (mixed together in one string). If errortoo is false and any bytes are received over stderr, this will fire with an _UnexpectedErrorOutput instance and the attribute will be set to None. |
| Instance Variable | onProcessEnded | If errortoo is false and bytes are received over stderr, this attribute will refer to a Deferred which will be called back when the process ends. This Deferred is also associated with the _UnexpectedErrorOutput which deferred fires with earlier in this case so that users can determine when the process has actually ended, in addition to knowing when bytes have been received via stderr. |
| Method | __init__ | Undocumented |
| Instance Variable | s | Undocumented |
| Method | errReceivedIsBad | Undocumented |
| Method | errReceivedIsGood | Undocumented |
| Method | outReceived | Some data was received from stdout. |
| Method | processEnded | Called when the child process exits and all file descriptors associated with it have been closed. |
Inherited from ProcessProtocol:
| Method | childDataReceived | Called when data arrives from the child process. |
| Method | errReceived | Some data was received from stderr. |
| Method | childConnectionLost | Called when a file descriptor associated with the child process is closed. |
| Method | inConnectionLost | This will be called when stdin is closed. |
| Method | outConnectionLost | This will be called when stdout is closed. |
| Method | errConnectionLost | This will be called when stderr is closed. |
| Method | processExited | This will be called when the subprocess exits. |
Inherited from BaseProtocol (via ProcessProtocol):
| Instance Variable | connected | Undocumented |
| Instance Variable | transport | Undocumented |
| Method | makeConnection | Make a connection to a transport and a server. |
| Method | connectionMade | Called when a connection is made. |
Deferred which will be called back with all of stdout and, if errortoo is true, all of stderr as well (mixed together in one string). If errortoo is false and any bytes are received over stderr, this will fire with an _UnexpectedErrorOutput instance and the attribute will be set to None.errortoo is false and bytes are received over stderr, this attribute will refer to a Deferred which will be called back when the process ends. This Deferred is also associated with the _UnexpectedErrorOutput which deferred fires with earlier in this case so that users can determine when the process has actually ended, in addition to knowing when bytes have been received via stderr.Called when the child process exits and all file descriptors associated with it have been closed.
| Parameters | reason | Undocumented (type: twisted.python.failure.Failure) |