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Back-ported, durable, and portable selectors

Project description

Selectors2

Backported, durable, and portable selectors designed to replacethe standard library selectors module.

Features

Support for all major platforms. (Linux, Mac OS, Windows)
Support for Python 2.6 or later and Jython.
Support many different selectors
- select.kqueue (BSD, Mac OS)
- select.devpoll (Solaris)
- select.epoll (Linux 2.5.44+)
- select.poll (Linux, Mac OS)
- select.select - (Linux, Mac OS, Windows)
Support for PEP 475 (Retries system calls on interrupt)
Support for modules which monkey-patch the standard library after import (like greenlet, gevent)
Support for systems which define a selector being available but don’t actually implement it. ()

About

This module was originally written by me for the urllib3 project(history in PR #1001) but it was decided that it wouldbe beneficial for everyone to have access to this work.

All the additional features that selectors2 provides are real-world problems that have occurredand been reported during the lifetime of its maintenance and use within urllib3.

If this work is useful to you, feel free to say thanks,takes only a little time and really brightens my day! :cake:

Can this module be used in place of `selectors`?

Yes! This module is a 1-to-1 drop-in replacement for selectors andprovides all selector types that would be available in selectors includingDevpollSelector, KqueueSelector, EpollSelector, PollSelector, and SelectSelector.

What is different between selectors2 and selectors34?

This module is similar to selectors34 in that it supports Python 2.6 - 3.3but differs in that this module also implements PEP 475 for the backported selectors.This allows similar behaviour between Python 3.5+ selectors and selectors from before PEP 475.In selectors34, an interrupted system call would result in an incorrect return of no events, whichfor some use cases is not an acceptable behavior.

I will also add here that selectors2 also makes large improvements on the test suite surrounding itproviding 100% test coverage for each selector. The test suite is also more robust and tests durabilityof the selectors in many different situations that aren’t tested in selectors34.

What types of objects are supported?

At this current time selectors2 only support the SelectSelector for Windows which cannot select on non-socket objects.On Linux and Mac OS, both sockets and pipes are supported (some other types may be supported as well, such as fifos or special file devices).

What if I have to support a platform without `select.select`?

There are a few platforms that don’t have a selector available, notablyGoogle AppEngine. When running on those platforms any call to DefaultSelector()will raise a RuntimeError explaining that there are no selectors available.

License

This module is dual-licensed under MIT and PSF License.

Usage

Changelog

Release 2.0.2 (July 21, 2020)

[BUGFIX] Added support for long integers in Python 2.x.

Release 2.0.1 (August 17, 2017)