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-rw-r--r--src/leap/util/__init__.py0
-rw-r--r--src/leap/util/coroutines.py107
-rw-r--r--src/leap/util/fileutil.py73
-rw-r--r--src/leap/util/leap_argparse.py20
4 files changed, 200 insertions, 0 deletions
diff --git a/src/leap/util/__init__.py b/src/leap/util/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/leap/util/__init__.py
diff --git a/src/leap/util/coroutines.py b/src/leap/util/coroutines.py
new file mode 100644
index 00000000..5e25eb63
--- /dev/null
+++ b/src/leap/util/coroutines.py
@@ -0,0 +1,107 @@
+# the problem of watching a stdout pipe from
+# openvpn binary: using subprocess and coroutines
+# acting as event consumers
+
+from __future__ import division, print_function
+
+from subprocess import PIPE, Popen
+import sys
+from threading import Thread
+
+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:
+ #XXX log instead
+ print('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 ovservers: tuple
+ """
+ observer_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
diff --git a/src/leap/util/fileutil.py b/src/leap/util/fileutil.py
new file mode 100644
index 00000000..86a44a89
--- /dev/null
+++ b/src/leap/util/fileutil.py
@@ -0,0 +1,73 @@
+from itertools import chain
+import os
+import platform
+import stat
+
+
+def is_user_executable(fpath):
+ st = os.stat(fpath)
+ return bool(st.st_mode & stat.S_IXUSR)
+
+
+def extend_path():
+ ourplatform = platform.system()
+ if ourplatform == "Linux":
+ return "/usr/local/sbin:/usr/sbin"
+ # XXX add mac / win extended search paths?
+
+
+def which(program):
+ """
+ an implementation of which
+ that extends the path with
+ other locations, like sbin
+ (f.i., openvpn binary is likely to be there)
+ @param program: a string representing the binary we're looking for.
+ """
+ def is_exe(fpath):
+ """
+ check that path exists,
+ it's a file,
+ and is executable by the owner
+ """
+ # we would check for access,
+ # but it's likely that we're
+ # using uid 0 + polkitd
+
+ return os.path.isfile(fpath)\
+ and is_user_executable(fpath)
+
+ def ext_candidates(fpath):
+ yield fpath
+ for ext in os.environ.get("PATHEXT", "").split(os.pathsep):
+ yield fpath + ext
+
+ def iter_path(pathset):
+ """
+ returns iterator with
+ full path for a given path list
+ and the current target bin.
+ """
+ for path in pathset.split(os.pathsep):
+ exe_file = os.path.join(path, program)
+ #print 'file=%s' % exe_file
+ for candidate in ext_candidates(exe_file):
+ if is_exe(candidate):
+ yield candidate
+
+ fpath, fname = os.path.split(program)
+ if fpath:
+ if is_exe(program):
+ return program
+ else:
+ # extended iterator
+ # with extra path
+ extended_path = chain(
+ iter_path(os.environ["PATH"]),
+ iter_path(extend_path()))
+ for candidate in extended_path:
+ if candidate is not None:
+ return candidate
+
+ # sorry bro.
+ return None
diff --git a/src/leap/util/leap_argparse.py b/src/leap/util/leap_argparse.py
new file mode 100644
index 00000000..9c355134
--- /dev/null
+++ b/src/leap/util/leap_argparse.py
@@ -0,0 +1,20 @@
+import argparse
+
+
+def build_parser():
+ epilog = "Copyright 2012 The Leap Project"
+ parser = argparse.ArgumentParser(description="""
+Launches main LEAP Client""", epilog=epilog)
+ parser.add_argument('--debug', action="store_true",
+ help='launches in debug mode')
+ parser.add_argument('--config', metavar="CONFIG FILE", nargs='?',
+ action="store", dest="config_file",
+ type=argparse.FileType('r'),
+ help='optional config file')
+ return parser
+
+
+def init_leapc_args():
+ parser = build_parser()
+ opts = parser.parse_args()
+ return parser, opts