def __init__(self, plugin_name, plugin_domain, read_freq, time_to_reading):
from xmlrpclib import ServerProxy
# The proxy through which we talk to the rrd daemon is the
# same for all plugins, so we just initialize it once and
# share it among them
if PluginControl.__plugin_proxy is None:
PluginControl.__plugin_proxy = ServerProxy(
'http://' + SOCKPATH, transport=UnixStreamTransport()).Plugin
if plugin_domain not in PLUGIN_DOMAINS:
raise ValueError("'plugin_domain' = '{}' not one of '{}'".format(
plugin_domain, ', '.join(PLUGIN_DOMAINS)))
if read_freq not in READ_FREQS:
raise ValueError("'read_freq' = '{}' not one of '{}'".format(
read_freq, ', '.join(READ_FREQS)))
self.__time_to_reading = float(time_to_reading)
if time_to_reading >= READ_FREQS[read_freq] - 1:
raise ValueError("'time_to_reading' too high")
self.__mmap = PluginBackend(plugin_name)
self.__plugin_name = plugin_name
self.__plugin_domain = plugin_domain
self.__read_freq = read_freq
self.__dispatch = getattr(PluginControl.__plugin_proxy, plugin_domain)
