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# -*- coding: utf-8 -*- |
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"""Plugin system oject that controls readers and writers. |
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.. moduleauthor:: Kenny Freeman <[email protected]> |
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""" |
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__author__ = 'Kenny Freeman' |
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__email__ = '[email protected]' |
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__license__ = "ISCL" |
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__docformat__ = 'reStructuredText' |
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import plumd |
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import plumd.config |
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import plumd.plugins |
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import plumd.plugins.util |
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import plumd.plugins.read |
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import plumd.plugins.write |
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class PluginLoader(object): |
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"""Loads and controls the reader and writer objects. |
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raises: |
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ConfigError if a plugin is configured with an invalid path |
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ConfigError if a plugin configuration is missing 'name' |
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DuplicatePlugin if a plugin configuration has a duplicate 'name' |
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PluginLoadError if there was an error loading the plugin |
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:param config: a simple configuration helper object. |
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:type config: plumd.config.conf |
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:param log: a logger object |
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:type log: logger |
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:raises: ConfigError, DuplicatePlugin, PluginLoadError |
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""" |
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def __init__(self, log, config): |
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"""Loads and controls the reader and writer objects. |
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raises: |
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ConfigError if a plugin is configured with an invalid path |
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ConfigError if a plugin configuration is missing 'name' |
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DuplicatePlugin if a plugin configuration has a duplicate 'name' |
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PluginLoadError if there was an error loading the plugin |
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:param config: a simple configuration helper object. |
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:type config: plumd.config.conf |
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:param log: a logger object from structlog.get_logger() |
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:type log: logger |
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:raises: ConfigError, DuplicatePlugin, PluginLoadError |
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""" |
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self.log = log |
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msg = "initializing from: {0} conf: \n{1}" |
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self.log.debug(msg.format(config.path, config)) |
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self.config = config |
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self.readers = {} # reader plugin io objects |
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self.writers = {} # writer plugin io objects |
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self.load() |
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@property |
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def nplugins(self): |
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"""Returns the number of loaded plugins. |
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:rtype: int |
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""" |
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return len(self.readers.keys()) + len(self.writers.keys()) |
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@property |
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def nreaders(self): |
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"""Return the number of loaded reader plugins. |
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:rtype: int |
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""" |
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return len(self.readers.keys()) |
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@property |
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def nwriters(self): |
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"""Return the number of loaded writer plugins. |
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:rtype: int |
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""" |
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return len(self.writers.keys()) |
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def load(self): |
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"""Loads the configured plugin objects into self.readers and |
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self.writers. Sets the writers for each reader plugin. |
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raises: |
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ConfigError if ptype has an incorrect configuration path set |
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ConfigError if a plugin configuration is missing 'name' |
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DuplicatePlugin if a plugin configuration has a duplicate 'name' |
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PluginLoadError if there was an error loading a plugin |
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:raises: ConfigError, DuplicatePlugin |
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""" |
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# load all plugins |
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pobjs = plumd.plugins.util.load_all_plugins(self.log, self.config) |
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# load_all_plugins returns a tuple of reader, writer objects |
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robjs, wobjs = pobjs |
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# setup reader threads for each reader plugin |
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for rname, robj in robjs.items(): |
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clsn = plumd.plugins.read.PluginReader |
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self.readers[rname] = clsn(self.log, robj, rname) |
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# setup writer threads for each writer plugin |
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for wname, wobj in wobjs.items(): |
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qsize = self.config.get('max.queue') |
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clsn = plumd.plugins.write.PluginWriter |
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self.writers[wname] = clsn(self.log, wobj, wname, qsize) |
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# now the readers need to know what writers to write to |
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plumd.plugins.util.config_plugin_writers(self) |
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def update_readers_writers(self): |
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"""Update the list of writers for each reader loaded.""" |
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# now set the PluginReaders writers |
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for prname, probj in self.readers.items(): |
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wcfg = probj.pobj.config.get('writers') |
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# if nothing is configured the reader writes to all |
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if wcfg is None: |
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probj.writers = self.writers.values() |
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continue |
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# get list of writer names |
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wnames = [ w for w in wcfg if w in self.writers.keys() ] |
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if wnames: |
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args = [prname, wnames] |
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self.log.info("load: setting {0} writers: {1}".format(*args)) |
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probj.writers = [ self.writers[w] for w in wnames ] |
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continue |
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# no writers found or no writers configured |
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msg = "load: disabling reader {0}: no writers" |
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self.log.error(msg.format(probj.name)) |
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del(self.readers[probj.name]) |
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del(probj.pobj) |
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del(probj) |
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def start(self): |
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"""Calls the start() function on each reader/writer.""" |
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self.log.debug("starting") |
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# start the writers then the readers |
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plugins = [('writers', self.writers), ('readers', self.readers) ] |
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for ptype, pdict in plugins: |
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self.log.debug("starting: {0}".format(ptype)) |
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map(lambda pobj: pobj.start(), pdict.values()) |
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# all done |
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self.log.debug("started") |
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def stop(self): |
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"""Calls the stop() function on each reader/writer.""" |
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self.log.debug("stopping plugins") |
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# stop the readers first - they call each plugins onstop() |
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self.log.debug("stopping readers") |
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for pobj in self.readers.values(): |
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self.log.debug("stopping reader: {0}".format(pobj.name)) |
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pobj.stop() |
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## next stop the writers - they call each plugins onstop() |
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self.log.debug("stopping writers") |
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for pobj in self.writers.values(): |
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self.log.debug("stopping writer: {0}".format(pobj.name)) |
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pobj.stop() |
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# join threads now |
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pobjs = [ ('readers', self.readers), |
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('writers', self.writers) ] |
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for ( ptype, pdict ) in pobjs: |
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for pname, pobj in pdict.items(): |
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self.log.debug("waiting for plugin to stop: {0}".format(pname)) |
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pobj.join() |
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# all done |
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self.log.debug("stopped") |
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def __del__(self): |
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"""Log __del__ calls.""" |
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self.log.debug("del") |
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s4z /
plumd
