__ __ __ __ _____ _ _ _____ _ _ _
| \/ | \ \ / / | __ \ (_) | | / ____| | | | |
| \ / |_ __\ V / | |__) | __ ___ ____ _| |_ ___ | (___ | |__ ___| | |
| |\/| | '__|> < | ___/ '__| \ \ / / _` | __/ _ \ \___ \| '_ \ / _ \ | |
| | | | |_ / . \ | | | | | |\ V / (_| | || __/ ____) | | | | __/ | |
|_| |_|_(_)_/ \_\ |_| |_| |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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# -*- coding: utf-8 -*-
# hooks.py
# Module providing hooks functionality
#
# Copyright (C) 2016 Jakub Kadlcik
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# the GNU General Public License v.2, or (at your option) any later version.
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY expressed or implied, including the implied warranties of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details. You should have received a copy of the
# GNU General Public License along with this program; if not, write to the
# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
#
import os
from tracer.paths import HOOKS_DIRS
from tracer.resources.pycomp import load_source
_hooks = {}
class HooksObserver(object):
"""
Provides interface for calling user hooks
When initializing, loads all hooks located in HOOKS_DIRS. Then it can called
with application name as argument. Observer ensures calling all hooks defined for the application.
"""
def __init__(self):
_register_hooks()
def __call__(self, app):
if app not in _hooks:
return
[f() for f in _hooks[app]]
def match(apps):
"""
Decorator for tracer hooks.
Example::
from tracer import hooks
@hooks.match("foo")
def hook_app():
print("Hey, application foo was found")
.. note::
You can match multiple applications by calling ``@hooks.match`` with list of them.
"""
def decorator(f):
for app in apps if type(apps) == list else [apps]:
if app not in _hooks:
_hooks[app] = []
_hooks[app].append(f)
return f
return decorator
def _register_hooks():
# see search function here
# http://stackoverflow.com/a/4788700/3285282
for hook_dir in HOOKS_DIRS:
for root, dirs, files in os.walk(hook_dir):
for fname in files:
modname = os.path.splitext(fname)[0]
try:
load_source(modname, os.path.join(root, fname))
except Exception:
continue