Python ports of useful syscalls, using asynchronous I/O.
Teena aims to be a collection of ports of UNIX and Linux syscalls to pure Python, with an emphasis on performance and correctness. Windows support is not a primary concern—I’m initially targeting only POSIX-compliant operating systems. The library uses Tornado to do efficient asynchronous I/O.
The first version of this library will contain implementations of tee and splice which operate on files, sockets, and file descriptors. There’s also a Capture class which behaves like StringIO, but it has a fileno() and so can be used where a real file descriptor is needed.
I’ll demonstrate how to capture the result of an HTTP request, whilst efficiently streaming the response to stderr.
Do the necessary imports:
>>> from contextlib import closing >>> import teena >>> import os >>> import sys >>> import urllib2
Create a teena.Capture() object to capture the output:
>>> capture = teena.Capture()
Open a connection using urllib2.urlopen(). This connection object has an associated file descriptor, so you can pass it directly into tee():
>>> with closing(urllib2.urlopen('http://whatthecommit.com/index.txt')) as conn: ... teena.tee(conn, (sys.stderr, capture.input)) This really should not take 19 minutes to build. >>> print repr(capture.getvalue()) 'This really should not take 19 minutes to build.\n'
pip install teena
Copyright (C) 2012 Zachary Voase
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