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# -*- test-case-name: twisted.test.test_stdio -*-
"""Standard input/out/err support.
Future Plans::
support for stderr, perhaps
Rewrite to use the reactor instead of an ad-hoc mechanism for connecting
protocols to transport.
Maintainer: James Y Knight
"""
from __future__ import annotations
from zope.interface import implementer
from twisted.internet import interfaces, process
from twisted.internet.interfaces import IProtocol, IReactorFDSet
from twisted.logger import Logger
from twisted.python.failure import Failure
_log = Logger()
@implementer(interfaces.IAddress)
class PipeAddress:
pass
@implementer(
interfaces.ITransport,
interfaces.IProducer,
interfaces.IConsumer,
interfaces.IHalfCloseableDescriptor,
)
class StandardIO:
_reader = None
_writer = None
disconnected = False
disconnecting = False
def __init__(
self,
proto: IProtocol,
stdin: int = 0,
stdout: int = 1,
reactor: IReactorFDSet | None = None,
):
if reactor is None:
from twisted.internet import reactor # type:ignore[assignment]
self.protocol: IProtocol = proto
self._writer = process.ProcessWriter(reactor, self, "write", stdout)
self._reader = process.ProcessReader(reactor, self, "read", stdin)
self._reader.startReading()
self.protocol.makeConnection(self)
# ITransport
# XXX Actually, see #3597.
def loseWriteConnection(self):
if self._writer is not None:
self._writer.loseConnection()
def write(self, data):
if self._writer is not None:
self._writer.write(data)
def writeSequence(self, data):
if self._writer is not None:
self._writer.writeSequence(data)
def loseConnection(self):
self.disconnecting = True
if self._writer is not None:
self._writer.loseConnection()
if self._reader is not None:
# Don't loseConnection, because we don't want to SIGPIPE it.
self._reader.stopReading()
def getPeer(self):
return PipeAddress()
def getHost(self):
return PipeAddress()
# Callbacks from process.ProcessReader/ProcessWriter
def childDataReceived(self, fd: str, data: bytes) -> None:
self.protocol.dataReceived(data)
def childConnectionLost(self, fd: str, reason: Failure) -> None:
if self.disconnected:
return
if fd == "read":
self._readConnectionLost(reason)
else:
self._writeConnectionLost(reason)
def connectionLost(self, reason):
self.disconnected = True
# Make sure to cleanup the other half
_reader = self._reader
_writer = self._writer
protocol = self.protocol
self._reader = self._writer = None
self.protocol = None # type:ignore[assignment]
if _writer is not None and not _writer.disconnected:
_writer.connectionLost(reason)
if _reader is not None and not _reader.disconnected:
_reader.connectionLost(reason)
with _log.failuresHandled("while calling stdio connectionLost:"):
protocol.connectionLost(reason)
def _writeConnectionLost(self, reason: Failure) -> None:
self._writer = None
if self.disconnecting:
self.connectionLost(reason)
return
p = interfaces.IHalfCloseableProtocol(self.protocol, None)
if p:
with _log.failuresHandled(
"while calling stdio writeConnectionLost:"
) as wcl:
p.writeConnectionLost()
if wcl.failed:
self.connectionLost(wcl.failure)
def _readConnectionLost(self, reason: Failure) -> None:
self._reader = None
p = interfaces.IHalfCloseableProtocol(self.protocol, None)
if p:
with _log.failuresHandled("while calling stdio readConnectionLost:") as rcl:
p.readConnectionLost()
if rcl.failed:
self.connectionLost(rcl.failure)
else:
self.connectionLost(reason)
# IConsumer
def registerProducer(self, producer, streaming):
if self._writer is None:
producer.stopProducing()
else:
self._writer.registerProducer(producer, streaming)
def unregisterProducer(self):
if self._writer is not None:
self._writer.unregisterProducer()
# IProducer
def stopProducing(self):
self.loseConnection()
def pauseProducing(self):
if self._reader is not None:
self._reader.pauseProducing()
def resumeProducing(self):
if self._reader is not None:
self._reader.resumeProducing()
def stopReading(self):
"""Compatibility only, don't use. Call pauseProducing."""
self.pauseProducing()
def startReading(self):
"""Compatibility only, don't use. Call resumeProducing."""
self.resumeProducing()
def readConnectionLost(self, reason):
# L{IHalfCloseableDescriptor.readConnectionLost}
raise NotImplementedError()
def writeConnectionLost(self, reason):
# L{IHalfCloseableDescriptor.writeConnectionLost}
raise NotImplementedError()
|
