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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.python.deprecate import getWarningMethod from twisted.python.failure import Failure from twisted.python.log import err from twisted.python.reflect import qual _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: try: processExited(Failure(reason)) except BaseException: err(None, "unexpected error in processExited") 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 try: proto.processEnded(Failure(reason)) except BaseException: err(None, "unexpected error in processEnded")