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author | Tomás Touceda <chiiph@leap.se> | 2013-06-28 14:25:19 -0300 |
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committer | Tomás Touceda <chiiph@leap.se> | 2013-06-28 14:25:19 -0300 |
commit | 5b975799ce9b7a6e0a88be4bcb48bdfb90800bb3 (patch) | |
tree | bda674a79b1aeccb37b67609517bc4761db7ae07 /src/leap/util/coroutines.py | |
parent | 9cea9c8a34343f8792d65b96f93ae22bd8685878 (diff) | |
parent | c088a1544a5f7a51359d2802019c0740aab0cc5b (diff) |
Merge branch 'release-0.2.2'0.2.2
Diffstat (limited to 'src/leap/util/coroutines.py')
-rw-r--r-- | src/leap/util/coroutines.py | 109 |
1 files changed, 0 insertions, 109 deletions
diff --git a/src/leap/util/coroutines.py b/src/leap/util/coroutines.py deleted file mode 100644 index 0657fc04..00000000 --- a/src/leap/util/coroutines.py +++ /dev/null @@ -1,109 +0,0 @@ -# the problem of watching a stdout pipe from -# openvpn binary: using subprocess and coroutines -# acting as event consumers - -from __future__ import division, print_function - -import logging -from subprocess import PIPE, Popen -import sys -from threading import Thread - -logger = logging.getLogger(__name__) - -ON_POSIX = 'posix' in sys.builtin_module_names - - -# -# Coroutines goodies -# - -def coroutine(func): - def start(*args, **kwargs): - cr = func(*args, **kwargs) - cr.next() - return cr - return start - - -@coroutine -def process_events(callback): - """ - coroutine loop that receives - events sent and dispatch the callback. - :param callback: callback to be called\ -for each event - :type callback: callable - """ - try: - while True: - m = (yield) - if callable(callback): - callback(m) - else: - logger.debug('not a callable passed') - except GeneratorExit: - return - -# -# Threads -# - - -def launch_thread(target, args): - """ - launch and demonize thread. - :param target: target function that will run in thread - :type target: function - :param args: args to be passed to thread - :type args: list - """ - t = Thread(target=target, - args=args) - t.daemon = True - t.start() - return t - - -def watch_output(out, observers): - """ - initializes dict of observer coroutines - and pushes lines to each of them as they are received - from the watched output. - :param out: stdout of a process. - :type out: fd - :param observers: tuple of coroutines to send data\ -for each event - :type observers: tuple - """ - observer_dict = dict(((observer, process_events(observer)) - for observer in observers)) - for line in iter(out.readline, b''): - for obs in observer_dict: - observer_dict[obs].send(line) - out.close() - - -def spawn_and_watch_process(command, args, observers=None): - """ - spawns a subprocess with command, args, and launch - a watcher thread. - :param command: command to be executed in the subprocess - :type command: str - :param args: arguments - :type args: list - :param observers: tuple of observer functions to be called \ -for each line in the subprocess output. - :type observers: tuple - :return: a tuple containing the child process instance, and watcher_thread, - :rtype: (Subprocess, Thread) - """ - subp = Popen([command] + args, - stdout=PIPE, - stderr=PIPE, - bufsize=1, - close_fds=ON_POSIX) - watcher = launch_thread( - watch_output, - (subp.stdout, observers)) - return subp, watcher |