Popular recipes tagged "nonblocking" but not "gui"

Tail multiple pidgin IRC logfiles (Python)

2015-06-06T12:13:00-07:00

Python recipe 579066 by Anton Vredegoor (colorize, irc, iterators, logfiles, merging, nonblocking, pidgin, tail, threads). Revision 2.

Tail multiple pidgin IRC logfiles.

Pidgin should be connected to IRC with the channels one wants to tail joined, and it should save logs as text.

The script needs two arguments:

the directory containing the directories with channel logs

a list of channel names, quoted and separated by spaces

Example command:

python pidgin-irctail.py -d ~/.purple/logs/irc/YOUR_IRC_HANDLE@irc.freenode.net -c "#chan1 #chan2 #chan3"

Some text elements are higlighted, and channel names are inserted into the log lines after the time info.

If more than one channel is entered, the output of the logs is merged.

Non-blocking readlines() (Python)

2014-06-30T20:30:57-07:00

Python recipe 578900 by Zack Weinberg (concurrency, input, line, nonblocking).

A generator function which takes a file object (assumed to be some sort of pipe or socket, open for reading), and yields lines from it without blocking. If there is no input available, it will yield an endless stream of empty strings until input becomes available again; caller is responsible for not going into a busy loop. (Newlines are normalized but not stripped, so if there is actually a blank line in the input, the value yielded will be '\n'.) The intended use case is a thread which must respond promptly to input from a pipe, and also something else which cannot be fed to select (e.g. a queue.Queue). Note that the file object is ignored except for its fileno.

Only tested on Unix. Only tested on 3.4; ought to work with any python that has bytearray, locale.getpreferredencoding, and fcntl.

asyncore scheduler (Python)

2011-07-25T23:42:21-07:00

Python recipe 577808 by Giampaolo Rodolà (asynchronous, asyncore, heapq, nonblocking, scheduler, twisted). Revision 5.

The thing I miss mostly in asyncore is a system for calling a function after a certain amount of time without blocking. This is crucial for simple tasks such as disconnecting a peer after a certain time of inactivity or more advanced use cases such as bandwidth throttling.

This recipe was initially inspired by Twisted's internet.base.DelayedCall class:

http://twistedmatrix.com/trac/browser/tags/last_vfs_and_web2/twisted/internet/base.py#L34

...then included into pyftpdlib:

http://code.google.com/p/pyftpdlib/issues/detail?id=72

...and finally proposed for inclusion into asyncore:

http://bugs.python.org/issue1641

Multicontext (e.g. asynchronous) inline execution framework using coroutines (Python)

2012-12-06T19:32:20-08:00

Python recipe 576965 by Glenn Eychaner (asynchronous, coroutine, decorator, generator, inline, nonblocking, pattern, thread). Revision 14.

A framework for executing inline code, contained in a generator, across multiple execution contexts, by pairing it with an executor that handles the context switching at each yield. An example of a generator which executes some iterations synchronously and some asynchronously is provided. The framework is general enough to be applied to many different coroutine situations.