socketserver: Add missing ForkingUnixStreamServer and ForkingUnixDatagramServer servers

[jb2170]

Enhancement

This issue / PR addresses two missing servers from the socketserver module

Current behaviour

socketserver has the following

Protocol	Family	Simple	Forking	Threading
TCP	AF_INET	TCPServer	ForkingTCPServer	ThreadingTCPServer
TCP	AF_UNIX	UnixStreamServer	???	ThreadingUnixStreamServer
UDP	AF_INET	UDPServer	ForkingUDPServer	ThreadingUDPServer
UDP	AF_UNIX	UnixDatagramServer	???	ThreadingUnixDatagramServer

Observe the two gaps marked by "???"

Proposal

In the case hasattr(socket, "AF_UNIX") and hasattr(os, "fork") we enable the two missing servers as

class ForkingUnixStreamServer(ForkingMixIn, UnixStreamServer): pass

class ForkingUnixDatagramServer(ForkingMixIn, UnixDatagramServer): pass

These follow the established naming convention

This enhancement is completely forwards/backwards compatible

Mentions in the documentation are included in the PR corresponding to this issue

Pitch

Googling ForkingUnixStreamServer shows a few people / codebases which define such a class in the same manner as above. I myself have done so in a project.

These classes seem to have been overlooked because they require two if checks for hasattr(socket, "AF_UNIX") and hasattr(os, "fork").

It seems clear to me therefore that these two classes should be added to the socketserver standard library module

Some people prefer forks to threads

Linked PRs

• gh-103673: Add missing ForkingUnixStreamServer and ForkingUnixDatagramServer socketservers #103674

[jb2170]

Completed by d94b3a6, nice one!

[gpshead]

Thanks!