133 lines
4.0 KiB
Python
133 lines
4.0 KiB
Python
from logging import getLogger
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from queue import Queue, Empty
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from threading import Thread, Event
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from time import time
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from typing import Iterable, List
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from sqlalchemy import and_, or_
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from sqlalchemy.orm import Session
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from ._base import Entity
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class EntitiesEngine(Thread):
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# Processing queue timeout in seconds
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_queue_timeout = 5.0
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def __init__(self):
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obj_name = self.__class__.__name__
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super().__init__(name=obj_name)
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self.logger = getLogger(name=obj_name)
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self._queue = Queue()
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self._should_stop = Event()
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def post(self, *entities: Entity):
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for entity in entities:
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self._queue.put(entity)
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@property
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def should_stop(self) -> bool:
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return self._should_stop.is_set()
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def stop(self):
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self._should_stop.set()
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def run(self):
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super().run()
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self.logger.info('Started entities engine')
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while not self.should_stop:
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msgs = []
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last_poll_time = time()
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while not self.should_stop and (
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time() - last_poll_time < self._queue_timeout
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):
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try:
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msg = self._queue.get(block=True, timeout=0.5)
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except Empty:
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continue
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if msg:
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msgs.append(msg)
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if not msgs or self.should_stop:
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continue
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try:
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self._process_entities(*msgs)
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except Exception as e:
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self.logger.error('Error while processing entity updates: ' + str(e))
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self.logger.exception(e)
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self.logger.info('Stopped entities engine')
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def _get_if_exist(
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self, session: Session, entities: Iterable[Entity]
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) -> Iterable[Entity]:
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existing_entities = {
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(entity.external_id or entity.name, entity.plugin): entity
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for entity in session.query(Entity)
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.filter(
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or_(
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*[
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and_(
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Entity.external_id == entity.external_id,
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Entity.plugin == entity.plugin,
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)
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if entity.external_id is not None
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else and_(
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Entity.name == entity.name, Entity.plugin == entity.plugin
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)
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for entity in entities
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]
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)
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)
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.all()
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}
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return [
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existing_entities.get(
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(entity.external_id or entity.name, entity.plugin), None
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)
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for entity in entities
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]
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def _merge_entities(
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self, entities: List[Entity], existing_entities: List[Entity]
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) -> List[Entity]:
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def merge(entity: Entity, existing_entity: Entity) -> Entity:
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columns = [col.key for col in entity.columns]
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for col in columns:
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if col not in ('id', 'created_at'):
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setattr(existing_entity, col, getattr(entity, col))
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return existing_entity
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new_entities = []
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entities_map = {}
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# Get the latest update for each ((id|name), plugin) record
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for e in entities:
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key = ((e.external_id or e.name), e.plugin)
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entities_map[key] = e
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# Retrieve existing records and merge them
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for i, entity in enumerate(entities):
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existing_entity = existing_entities[i]
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if existing_entity:
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entity = merge(entity, existing_entity)
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new_entities.append(entity)
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return new_entities
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def _process_entities(self, *entities: Entity):
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from platypush.context import get_plugin
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with get_plugin('db').get_session() as session: # type: ignore
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existing_entities = self._get_if_exist(session, entities)
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entities = self._merge_entities(entities, existing_entities) # type: ignore
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session.add_all(entities)
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session.commit()
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