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Edit File: _baseprocess.py

# -*- 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")