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This Python library was evolved at IronPort Systems and has been provided as open source by Cisco Systems under an MIT license.

Intro

Shrapnel is a library for high-performance concurrency. It uses coroutines to implement user threads on top of either kqueue (FreeBSD, OS X) or /dev/epoll (linux), and is written mostly in Pyrex/Cython, supporting both 32-bit and 64-bit platforms. It is the culmination of about 8 years of work at IronPort Systems, a provider of high-speed mail appliances. It was open-sourced by Cisco Systems in late 2011.

Features

  • Lightweight threads, event-driven scheduler.
  • Underneath: non-blocking operations on descriptors, like sockets and pipes.
  • On top, synchronous API for straight-line, simple code.
  • Highly scalable - tens or hundreds of thousands of connections/threads.
  • Thread synchronization primitives, like mutexes, semaphores, etc...
  • Wait on kqueue events like file/directory changes, signals, processes, etc... [kqueue only]
  • DNS stub resolver (full-fledged resolver may be forthcoming)
  • HTTP server and client
  • Support for TLS via tlslite (openssl interface may be forthcoming)
  • other protocols/codecs: ldap, asn1, ftp, mysql, postgres, AMQP.
  • MIT License.

Tutorial

See http://ironport.github.com/shrapnel/tutorial.html

API Documentation

See http://ironport.github.com/shrapnel/