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# -*- test-case-name: twisted.test.test_process -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Cross-platform process-related functionality used by different
L{IReactorProcess} implementations.
"""
from typing import Optional
from twisted.logger import Logger
from twisted.python.deprecate import getWarningMethod
from twisted.python.failure import Failure
from twisted.python.reflect import qual
_log = Logger()
_missingProcessExited = (
"Since Twisted 8.2, IProcessProtocol.processExited "
"is required. %s must implement it."
)
class BaseProcess:
pid: Optional[int] = None
status: Optional[int] = None
lostProcess = 0
proto = None
def __init__(self, protocol):
self.proto = protocol
def _callProcessExited(self, reason):
default = object()
processExited = getattr(self.proto, "processExited", default)
if processExited is default:
getWarningMethod()(
_missingProcessExited % (qual(self.proto.__class__),),
DeprecationWarning,
stacklevel=0,
)
else:
with _log.failuresHandled("while calling processExited:"):
processExited(Failure(reason))
def processEnded(self, status):
"""
This is called when the child terminates.
"""
self.status = status
self.lostProcess += 1
self.pid = None
self._callProcessExited(self._getReason(status))
self.maybeCallProcessEnded()
def maybeCallProcessEnded(self):
"""
Call processEnded on protocol after final cleanup.
"""
if self.proto is not None:
reason = self._getReason(self.status)
proto = self.proto
self.proto = None
with _log.failuresHandled("while calling processEnded:"):
proto.processEnded(Failure(reason))
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