e0256a3fdb
Introduces the time_sync object which can sync time with an external time service (like the time_sync service in notigen). This is used for playback of old events. It prevents premature expiry triggers. Also some tweaks to the UsageHandler, work in progress and used for testing. Change-Id: I45033fbd9c12d98f96816a4f90cf7dc8c915ef51
364 lines
15 KiB
Python
364 lines
15 KiB
Python
import time
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import logging
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import random
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import simport
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import six
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from winchester.db import DBInterface, DuplicateError, LockError
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from winchester.config import ConfigManager, ConfigSection, ConfigItem
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from winchester.definition import TriggerDefinition
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from winchester.models import StreamState
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from winchester import time_sync as ts
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from winchester.trigger_manager import TriggerManager
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logger = logging.getLogger(__name__)
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class PipelineError(Exception):
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pass
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class PipelineExecutionError(PipelineError):
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def __init__(self, msg="", cause=None):
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super(PipelineExecutionError, self).__init__("%s: caused by %s" % (msg, repr(cause)))
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self.cause = cause
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class PipelineConfigError(PipelineError):
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pass
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class Pipeline(object):
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@classmethod
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def check_handler_config(cls, conf, handler_map):
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if isinstance(conf, six.string_types):
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conf = dict(name=conf, params=dict())
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if 'name' not in conf:
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raise PipelineConfigError("Handler name not in config! %s" % str(conf))
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if 'params' not in conf:
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conf['params'] = {}
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if conf['name'] not in handler_map:
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raise PipelineConfigError("Unknown handler in pipeline config %s" % conf['name'])
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return conf
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def __init__(self, name, config, handler_map):
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self.name = name
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self.handlers = []
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self.env = dict()
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for handler_conf in config:
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name = handler_conf['name']
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params = handler_conf['params']
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handler_class = handler_map[name]
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try:
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handler = handler_class(**params)
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except Exception as e:
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logger.exception("Error initalizing handler %s for pipeline %s" %
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handler_class, self.name)
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raise PipelineExecutionError("Error loading pipeline", e)
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self.handlers.append(handler)
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def handle_events(self, events, stream, debugger):
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self.env['stream_id'] = stream.id
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event_ids = set(e['message_id'] for e in events)
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try:
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for handler in self.handlers:
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events = handler.handle_events(events, self.env)
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debugger.bump_counter("Pre-commit successful")
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except Exception as e:
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logger.exception("Error processing pipeline %s" % self.name)
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debugger.bump_counter("Pipeline error")
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self.rollback(debugger)
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raise PipelineExecutionError("Error in pipeline", e)
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new_events = [e for e in events if e['message_id'] not in event_ids]
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self.commit(debugger)
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return new_events
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def commit(self, debugger):
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for handler in self.handlers:
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try:
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handler.commit()
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debugger.bump_counter("Commit successful")
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except:
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debugger.bump_counter("Commit error")
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logger.exception("Commit error on handler in pipeline %s" % self.name)
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def rollback(self, debugger):
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for handler in self.handlers:
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try:
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handler.rollback()
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debugger.bump_counter("Rollback successful")
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except:
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debugger.bump_counter("Rollback error")
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logger.exception("Rollback error on handler in pipeline %s" % self.name)
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class PipelineManager(object):
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@classmethod
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def config_description(cls):
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configs = TriggerManager.config_description()
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configs.update(dict(
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pipeline_handlers=ConfigItem(required=True,
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help="dictionary of pipeline handlers to load "
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"Classes specified with simport syntax. "
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"simport docs for more info"),
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pipeline_worker_batch_size=ConfigItem(
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help="Number of streams for pipeline "
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"worker(s) to load at a time",
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default=1000),
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pipeline_worker_delay=ConfigItem(
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help="Number of seconds for pipeline worker "
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"to sleep when it finds no streams to "
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"process", default=10),
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pipeline_config=ConfigItem(required=True,
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help="Name of pipeline config file "
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"defining the handlers for each "
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"pipeline."),
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purge_completed_streams=ConfigItem(
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help="Delete successfully proccessed "
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"streams when finished?",
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default=True),
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))
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return configs
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def __init__(self, config, db=None, pipeline_handlers=None,
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pipeline_config=None, trigger_defs=None, time_sync=None):
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logger.debug("PipelineManager: Using config: %s" % str(config))
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config = ConfigManager.wrap(config, self.config_description())
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self.config = config
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config.check_config()
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config.add_config_path(*config['config_path'])
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if time_sync is None:
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time_sync = ts.TimeSync()
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self.time_sync = time_sync
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if db is not None:
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self.db = db
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else:
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self.db = DBInterface(config['database'])
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if pipeline_handlers is not None:
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self.pipeline_handlers = pipeline_handlers
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else:
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self.pipeline_handlers = self._load_plugins(config['pipeline_handlers'])
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logger.debug("Pipeline handlers: %s" % str(self.pipeline_handlers))
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if pipeline_config is not None:
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self.pipeline_config = pipeline_config
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else:
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self.pipeline_config = config.load_file(config['pipeline_config'])
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logger.debug("Pipeline config: %s" % str(self.pipeline_config))
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for pipeline, handler_configs in self.pipeline_config.items():
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self.pipeline_config[pipeline] = [Pipeline.check_handler_config(conf,
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self.pipeline_handlers)
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for conf in handler_configs]
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if trigger_defs is not None:
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self.trigger_definitions = trigger_defs
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else:
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defs = config.load_file(config['trigger_definitions'])
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logger.debug("Loaded trigger definitions %s" % str(defs))
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self.trigger_definitions = [TriggerDefinition(conf, None) for conf in defs]
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self.trigger_map = dict((tdef.name, tdef) for tdef in self.trigger_definitions)
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self.trigger_manager = TriggerManager(self.config, db=self.db,
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trigger_defs=self.trigger_definitions,
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time_sync=time_sync)
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self.pipeline_worker_batch_size = config['pipeline_worker_batch_size']
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self.pipeline_worker_delay = config['pipeline_worker_delay']
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self.statistics_period = config['statistics_period']
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self.purge_completed_streams = config['purge_completed_streams']
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self.streams_fired = 0
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self.streams_expired = 0
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self.streams_loaded = 0
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self.last_status = self.current_time()
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@classmethod
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def _load_plugins(cls, plug_map, defaults=None):
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plugins = dict()
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if defaults is not None:
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plugins.update(defaults)
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for name, cls_string in plug_map.items():
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try:
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plugins[name] = simport.load(cls_string)
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except simport.ImportFailed as e:
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log.error("Could not load plugin %s: Import failed. %s" % (
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name, e))
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except (simport.MissingMethodOrFunction,
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simport.MissingModule,
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simport.BadDirectory) as e:
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log.error("Could not load plugin %s: Not found. %s" % (
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name, e))
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return plugins
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def current_time(self):
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# here so it's easily overridden.
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return self.time_sync.current_time()
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def _log_statistics(self):
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logger.info("Loaded %s streams. Fired %s, Expired %s." % (
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self.streams_loaded, self.streams_fired, self.streams_expired))
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self.streams_fired = 0
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self.streams_expired = 0
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self.streams_loaded = 0
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self.last_status = self.current_time()
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self.trigger_manager.debug_manager.dump_debuggers()
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def add_new_events(self, events):
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for event in events:
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self.trigger_manager.add_event(event)
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def _run_pipeline(self, stream, trigger_def, pipeline_name,
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pipeline_config):
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events = self.db.get_stream_events(stream)
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debugger = trigger_def.debugger
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try:
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pipeline = Pipeline(pipeline_name, pipeline_config, self.pipeline_handlers)
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new_events = pipeline.handle_events(events, stream, debugger)
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except PipelineExecutionError:
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logger.error("Exception in pipeline %s handling stream %s" % (
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pipeline_name, stream.id))
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return False
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if new_events:
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self.add_new_events(new_events)
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return True
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def _complete_stream(self, stream):
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if self.purge_completed_streams:
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self.db.purge_stream(stream)
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else:
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try:
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self.db.set_stream_state(stream, StreamState.completed)
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except LockError:
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logger.error("Stream %s locked while trying to set 'complete' state! "
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"This should not happen." % stream.id)
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def _error_stream(self, stream):
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try:
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self.db.set_stream_state(stream, StreamState.error)
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except LockError:
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logger.error("Stream %s locked while trying to set 'error' state! "
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"This should not happen." % stream.id)
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def _expire_error_stream(self, stream):
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try:
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self.db.set_stream_state(stream, StreamState.expire_error)
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except LockError:
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logger.error("Stream %s locked while trying to set 'expire_error' state! "
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"This should not happen." % stream.id)
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def safe_get_debugger(self, trigger_def):
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return trigger_def.debugger if trigger_def is not None else \
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self.trigger_manager.debug_manager.get_debugger(None)
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def fire_stream(self, stream):
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trigger_def = self.trigger_map.get(stream.name)
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debugger = self.safe_get_debugger(trigger_def)
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try:
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stream = self.db.set_stream_state(stream, StreamState.firing)
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except LockError:
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logger.debug("Stream %s locked. Moving on..." % stream.id)
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debugger.bump_counter("Locked")
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return False
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logger.debug("Firing Stream %s." % stream.id)
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if trigger_def is None:
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debugger.bump_counter("Unknown trigger def '%s'" % stream.name)
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logger.error("Stream %s has unknown trigger definition %s" % (
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stream.id, stream.name))
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self._error_stream(stream)
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return False
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pipeline = trigger_def.fire_pipeline
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if pipeline is not None:
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pipe_config = self.pipeline_config.get(pipeline)
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if pipe_config is None:
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debugger.bump_counter("Unknown pipeline '%s'" % pipeline)
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logger.error("Trigger %s for stream %s has unknown "
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"pipeline %s" % (stream.name, stream.id,
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pipeline))
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self._error_stream(stream)
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if not self._run_pipeline(stream, trigger_def, pipeline,
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pipe_config):
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self._error_stream(stream)
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return False
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else:
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logger.debug("No fire pipeline for stream %s. Nothing to do." % (
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stream.id))
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debugger.bump_counter("No fire pipeline for '%s'" % stream.name)
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self._complete_stream(stream)
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debugger.bump_counter("Streams fired")
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self.streams_fired +=1
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return True
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def expire_stream(self, stream):
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trigger_def = self.trigger_map.get(stream.name)
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debugger = self.safe_get_debugger(trigger_def)
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try:
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stream = self.db.set_stream_state(stream, StreamState.expiring)
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except LockError:
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debugger.bump_counter("Locked")
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logger.debug("Stream %s locked. Moving on..." % stream.id)
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return False
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logger.debug("Expiring Stream %s." % stream.id)
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if trigger_def is None:
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debugger.bump_counter("Unknown trigger def '%s'" % stream.name)
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logger.error("Stream %s has unknown trigger definition %s" % (
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stream.id, stream.name))
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self._expire_error_stream(stream)
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return False
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pipeline = trigger_def.expire_pipeline
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if pipeline is not None:
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pipe_config = self.pipeline_config.get(pipeline)
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if pipe_config is None:
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debugger.bump_counter("Unknown pipeline '%s'" % pipeline)
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logger.error("Trigger %s for stream %s has unknown pipeline %s" % (
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stream.name, stream.id, pipeline))
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self._expire_error_stream(stream)
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if not self._run_pipeline(stream, trigger_def, pipeline,
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pipe_config):
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self._expire_error_stream(stream)
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return False
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else:
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logger.debug("No expire pipeline for stream %s. Nothing to do." % (
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stream.id))
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debugger.bump_counter("No expire pipeline for '%s'" % stream.name)
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self._complete_stream(stream)
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debugger.bump_counter("Streams expired")
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self.streams_expired +=1
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return True
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def process_ready_streams(self, batch_size, expire=False):
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streams = self.db.get_ready_streams(batch_size, self.current_time(),
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expire=expire)
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stream_ct = len(streams)
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if expire:
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logger.debug("Loaded %s streams to expire." % stream_ct)
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else:
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logger.debug("Loaded %s streams to fire." % stream_ct)
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random.shuffle(streams)
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for stream in streams:
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if expire:
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self.expire_stream(stream)
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else:
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self.fire_stream(stream)
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self.streams_loaded += stream_ct
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return stream_ct
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def run(self):
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while True:
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fire_ct = self.process_ready_streams(self.pipeline_worker_batch_size)
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expire_ct = self.process_ready_streams(self.pipeline_worker_batch_size,
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expire=True)
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if (self.current_time() - self.last_status).seconds > self.statistics_period:
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self._log_statistics()
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if not fire_ct and not expire_ct:
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logger.debug("No streams to fire or expire. Sleeping...")
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time.sleep(self.pipeline_worker_delay)
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