def import_plugins(path="/etc/pyconfd/conf.d/"):
"""
Import plugins from the plugin path. Each of the plugin filenames should be
unique within the namespace of whatever python modules are available (like
the default standard library, and anything else installed).
"""
loaded_modules = []
abspath = os.path.abspath(path)
# make plugins available for importing
sys.path.append(abspath)
# get a list of available plugins
filenames = os.listdir(abspath)
log.debug("Found {} files.".format(len(filenames)))
# Remove ".py" from the name, use filename as module name Assume that all
# filenames are in the form of "xyz.py".
module_names = [filename.split(".")[0] for filename in filenames]
# filter out dupes
module_names = list(set(module_names))
# import each plugin
for module_name in module_names:
log.debug("Importing {}".format(module_name))
newmodule = importlib.import_module(module_name)
loaded_modules.append(newmodule)
return loaded_modules
def find_plugins():
"""
Finds all subclasses of Plugin. Use this after loading the plugin files.
"""
log.debug("Searching for loaded plugin subclasses.")
subclasses = Plugin.__subclasses__()
subclasses = [subclass for subclass in subclasses if subclass is not Plugin]
log.debug("Found {} subclasses.".format(len(subclasses)))
return subclasses
def reload_process(self):
"""
Graceful reload if haproxy is already running.
"""
try:
output = subprocess.check_output(["pidof", "haproxy"])
pids = output.strip().split(" ")
except Exception as exc:
command = "/usr/sbin/haproxy -f {{ dest }} -p /var/run/haproxy.pid"
else:
command = "/usr/sbin/haproxy -f {{ dest }} -p /var/run/haproxy.pid -sf xyz"
command = command.replace("xyz", " ".join(pids))
command = command.replace("{{ dest }}", self.dest)
log.debug("Running reload_cmd: {}".format(command))
args = shlex.split(command)
process = subprocess.Popen(args)
def reload_process(self):
"""
Graceful reload if haproxy is already running.
"""
try:
output = subprocess.check_output(["pidof", "haproxy"])
pids = output.strip().split(" ")
except Exception as exc:
command = "/usr/sbin/haproxy -f {{ dest }} -p /var/run/haproxy.pid"
else:
command = "/usr/sbin/haproxy -f {{ dest }} -p /var/run/haproxy.pid -sf xyz"
command = command.replace("xyz", " ".join(pids))
command = command.replace("{{ dest }}", self.dest)
log.debug("Running reload_cmd: {}".format(command))
args = shlex.split(command)
process = subprocess.Popen(args)
def launch_plugins(plugins):
"""
Starts looping each plugin. Note that blocking code will block other
plugins from executing.
"""
# gevent
jobs = []
# plugins is just a list of classes
for plugin in plugins:
log.debug("Starting plugin: {}".format(plugin))
# make an instance of the class
instance = plugin()
# async start plugin loop
newjob = gevent.spawn(instance.loop)
jobs.append(newjob)
return jobs