233 lines
8.6 KiB
Python
233 lines
8.6 KiB
Python
"""Data update coordinator for RSS/Atom feeds."""
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from __future__ import annotations
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from calendar import timegm
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from datetime import datetime
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from logging import getLogger
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from time import gmtime, struct_time
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from urllib.error import URLError
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import feedparser
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from homeassistant.config_entries import ConfigEntry
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from homeassistant.core import HomeAssistant, callback
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from homeassistant.helpers.storage import Store
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from homeassistant.helpers.update_coordinator import DataUpdateCoordinator, UpdateFailed
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from homeassistant.util import dt as dt_util
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from .const import DEFAULT_SCAN_INTERVAL, DOMAIN, EVENT_FEEDREADER
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DELAY_SAVE = 30
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STORAGE_VERSION = 1
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_LOGGER = getLogger(__name__)
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class FeedReaderCoordinator(
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DataUpdateCoordinator[list[feedparser.FeedParserDict] | None]
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):
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"""Abstraction over Feedparser module."""
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config_entry: ConfigEntry
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def __init__(
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self,
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hass: HomeAssistant,
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url: str,
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max_entries: int,
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storage: StoredData,
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) -> None:
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"""Initialize the FeedManager object, poll as per scan interval."""
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super().__init__(
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hass=hass,
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logger=_LOGGER,
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name=f"{DOMAIN} {url}",
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update_interval=DEFAULT_SCAN_INTERVAL,
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)
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self.url = url
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self.feed_author: str | None = None
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self.feed_version: str | None = None
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self._max_entries = max_entries
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self._storage = storage
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self._last_entry_timestamp: struct_time | None = None
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self._event_type = EVENT_FEEDREADER
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self._feed: feedparser.FeedParserDict | None = None
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self._feed_id = url
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@callback
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def _log_no_entries(self) -> None:
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"""Send no entries log at debug level."""
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_LOGGER.debug("No new entries to be published in feed %s", self.url)
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async def _async_fetch_feed(self) -> feedparser.FeedParserDict:
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"""Fetch the feed data."""
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_LOGGER.debug("Fetching new data from feed %s", self.url)
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def _parse_feed() -> feedparser.FeedParserDict:
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return feedparser.parse(
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self.url,
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etag=None if not self._feed else self._feed.get("etag"),
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modified=None if not self._feed else self._feed.get("modified"),
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)
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feed = await self.hass.async_add_executor_job(_parse_feed)
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if not feed:
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raise UpdateFailed(f"Error fetching feed data from {self.url}")
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# The 'bozo' flag really only indicates that there was an issue
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# during the initial parsing of the XML, but it doesn't indicate
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# whether this is an unrecoverable error. In this case the
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# feedparser lib is trying a less strict parsing approach.
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# If an error is detected here, log warning message but continue
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# processing the feed entries if present.
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if feed.bozo != 0:
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if isinstance(feed.bozo_exception, URLError):
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raise UpdateFailed(
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f"Error fetching feed data from {self.url} : {feed.bozo_exception}"
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)
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# no connection issue, but parsing issue
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_LOGGER.warning(
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"Possible issue parsing feed %s: %s",
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self.url,
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feed.bozo_exception,
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)
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return feed
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async def async_setup(self) -> None:
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"""Set up the feed manager."""
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feed = await self._async_fetch_feed()
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self.logger.debug("Feed data fetched from %s : %s", self.url, feed["feed"])
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self.feed_author = feed["feed"].get("author")
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self.feed_version = feedparser.api.SUPPORTED_VERSIONS.get(feed["version"])
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self._feed = feed
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async def _async_update_data(self) -> list[feedparser.FeedParserDict] | None:
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"""Update the feed and publish new entries to the event bus."""
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assert self._feed is not None
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# _last_entry_timestamp is not set during async_setup, but we have already
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# fetched data, so we can use them, instead of fetch again
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if self._last_entry_timestamp:
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self._feed = await self._async_fetch_feed()
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# Using etag and modified, if there's no new data available,
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# the entries list will be empty
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_LOGGER.debug(
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"%s entri(es) available in feed %s",
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len(self._feed.entries),
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self.url,
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)
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if not isinstance(self._feed.entries, list):
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self._log_no_entries()
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return None
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self._filter_entries()
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self._publish_new_entries()
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_LOGGER.debug("Fetch from feed %s completed", self.url)
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if self._last_entry_timestamp:
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self._storage.async_put_timestamp(self._feed_id, self._last_entry_timestamp)
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return self._feed.entries
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@callback
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def _filter_entries(self) -> None:
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"""Filter the entries provided and return the ones to keep."""
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assert self._feed is not None
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if len(self._feed.entries) > self._max_entries:
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_LOGGER.debug(
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"Processing only the first %s entries in feed %s",
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self._max_entries,
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self.url,
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)
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self._feed.entries = self._feed.entries[0 : self._max_entries]
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@callback
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def _update_and_fire_entry(self, entry: feedparser.FeedParserDict) -> None:
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"""Update last_entry_timestamp and fire entry."""
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# Check if the entry has a updated or published date.
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# Start from a updated date because generally `updated` > `published`.
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if time_stamp := entry.get("updated_parsed") or entry.get("published_parsed"):
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self._last_entry_timestamp = time_stamp
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else:
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_LOGGER.debug(
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"No updated_parsed or published_parsed info available for entry %s",
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entry,
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)
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entry["feed_url"] = self.url
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self.hass.bus.async_fire(self._event_type, entry)
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_LOGGER.debug("New event fired for entry %s", entry.get("link"))
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@callback
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def _publish_new_entries(self) -> None:
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"""Publish new entries to the event bus."""
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assert self._feed is not None
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new_entry_count = 0
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firstrun = False
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self._last_entry_timestamp = self._storage.get_timestamp(self._feed_id)
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if not self._last_entry_timestamp:
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firstrun = True
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# Set last entry timestamp as epoch time if not available
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self._last_entry_timestamp = dt_util.utc_from_timestamp(0).timetuple()
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# locally cache self._last_entry_timestamp so that entries published at identical times can be processed
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last_entry_timestamp = self._last_entry_timestamp
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for entry in self._feed.entries:
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if firstrun or (
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(
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time_stamp := entry.get("updated_parsed")
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or entry.get("published_parsed")
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)
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and time_stamp > last_entry_timestamp
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):
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self._update_and_fire_entry(entry)
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new_entry_count += 1
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else:
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_LOGGER.debug("Already processed entry %s", entry.get("link"))
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if new_entry_count == 0:
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self._log_no_entries()
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else:
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_LOGGER.debug("%d entries published in feed %s", new_entry_count, self.url)
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class StoredData:
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"""Represent a data storage."""
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def __init__(self, hass: HomeAssistant) -> None:
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"""Initialize data storage."""
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self._data: dict[str, struct_time] = {}
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self.hass = hass
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self._store: Store[dict[str, str]] = Store(hass, STORAGE_VERSION, DOMAIN)
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self.is_initialized = False
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async def async_setup(self) -> None:
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"""Set up storage."""
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if (store_data := await self._store.async_load()) is not None:
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# Make sure that dst is set to 0, by using gmtime() on the timestamp.
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self._data = {
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feed_id: gmtime(datetime.fromisoformat(timestamp_string).timestamp())
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for feed_id, timestamp_string in store_data.items()
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}
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self.is_initialized = True
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def get_timestamp(self, feed_id: str) -> struct_time | None:
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"""Return stored timestamp for given feed id."""
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return self._data.get(feed_id)
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@callback
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def async_put_timestamp(self, feed_id: str, timestamp: struct_time) -> None:
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"""Update timestamp for given feed id."""
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self._data[feed_id] = timestamp
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self._store.async_delay_save(self._async_save_data, DELAY_SAVE)
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@callback
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def _async_save_data(self) -> dict[str, str]:
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"""Save feed data to storage."""
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return {
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feed_id: dt_util.utc_from_timestamp(timegm(struct_utc)).isoformat()
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for feed_id, struct_utc in self._data.items()
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}
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