notify-bridge/packages/server/src/notify_bridge_server/services/watcher.py

"""Watcher service — orchestrates poll -> detect -> notify flow."""

from __future__ import annotations

import logging
from typing import Any

import aiohttp
from sqlmodel import select
from sqlmodel.ext.asyncio.session import AsyncSession

from notify_bridge_core.models.events import ServiceEvent
from notify_bridge_core.notifications.dispatcher import NotificationDispatcher, TargetConfig
from notify_bridge_core.notifications.telegram.cache import TelegramFileCache
from notify_bridge_core.storage import JsonFileBackend

from ..database.engine import get_engine
from ..database.models import (
    EventLog,
    NotificationTracker,
    NotificationTrackerState,
    ServiceProvider,
)
from .dispatch_helpers import event_allowed_by_config, load_link_data

_LOGGER = logging.getLogger(__name__)

# Module-level Telegram file caches — shared across dispatches for reuse
_url_cache: TelegramFileCache | None = None
_asset_cache: TelegramFileCache | None = None


async def _get_telegram_caches() -> tuple[TelegramFileCache | None, TelegramFileCache | None]:
    """Lazily initialize shared Telegram file caches using NOTIFY_BRIDGE_DATA_DIR."""
    global _url_cache, _asset_cache
    if _url_cache is not None:
        return _url_cache, _asset_cache
    import os
    from pathlib import Path
    data_dir = os.environ.get("NOTIFY_BRIDGE_DATA_DIR")
    if not data_dir:
        return None, None
    cache_dir = Path(data_dir) / "cache"
    _url_cache = TelegramFileCache(JsonFileBackend(cache_dir / "telegram_url_cache.json"))
    _asset_cache = TelegramFileCache(JsonFileBackend(cache_dir / "telegram_asset_cache.json"))
    await _url_cache.async_load()
    await _asset_cache.async_load()
    _LOGGER.info("Initialized Telegram file caches in %s", cache_dir)
    return _url_cache, _asset_cache


async def check_tracker(tracker_id: int) -> dict[str, Any]:
    """Poll a tracker's provider for changes and dispatch notifications."""
    engine = get_engine()

    # Load all DB data eagerly before entering aiohttp context
    async with AsyncSession(engine) as session:
        tracker = await session.get(NotificationTracker, tracker_id)
        if not tracker or not tracker.enabled:
            return {"status": "skipped", "reason": "disabled or not found"}

        provider = await session.get(ServiceProvider, tracker.provider_id)
        if not provider:
            return {"status": "error", "reason": "provider not found"}

        # Load tracker state
        result = await session.exec(
            select(NotificationTrackerState).where(NotificationTrackerState.tracker_id == tracker_id)
        )
        states = result.all()
        state_dict: dict[str, Any] = {}
        for s in states:
            state_dict[s.collection_id] = {
                "name": s.collection_name or "",
                "asset_ids": s.asset_ids,
                "pending_asset_ids": s.pending_asset_ids,
                "shared": bool(s.shared),
            }

        # Load tracker-target links
        link_data = await load_link_data(session, tracker_id, check_quiet_hours=True)

        # Snapshot the data we need
        provider_type = provider.type
        provider_config = dict(provider.config)
        provider_name = provider.name
        tracker_name = tracker.name
        tracker_filters = dict(tracker.filters) if tracker.filters else {}
        collection_ids = list(tracker.collection_ids or [])

    # Now create aiohttp session and poll
    events: list[ServiceEvent] = []
    new_state: dict[str, Any] = {}

    if provider_type == "immich":
        from notify_bridge_core.providers.immich import ImmichServiceProvider
        async with aiohttp.ClientSession() as http_session:
            immich = ImmichServiceProvider(
                http_session,
                provider_config.get("url", ""),
                provider_config.get("api_key", ""),
                provider_config.get("external_domain"),
                provider_name,
            )
            connected = await immich.connect()
            if not connected:
                return {"status": "error", "reason": "failed to connect to provider"}

            events, new_state = await immich.poll(collection_ids, state_dict)
    elif provider_type == "gitea":
        # Gitea is webhook-based — events arrive via /api/webhooks/gitea endpoint.
        # The scheduler still calls check_tracker but there's nothing to poll.
        return {"status": "ok", "events_detected": 0, "collections_checked": 0}
    elif provider_type == "planka":
        # Planka is webhook-based — events arrive via /api/webhooks/planka endpoint.
        return {"status": "ok", "events_detected": 0, "collections_checked": 0}
    elif provider_type == "scheduler":
        from notify_bridge_core.providers.scheduler import SchedulerServiceProvider
        custom_vars = tracker_filters.get("custom_variables", {})
        sched = SchedulerServiceProvider(
            name=provider_name,
            tracker_name=tracker_name,
            custom_variables=custom_vars,
        )
        events, new_state = await sched.poll(collection_ids, state_dict)
    else:
        return {"status": "error", "reason": f"unsupported provider type: {provider_type}"}

    # Save updated state and log events
    async with AsyncSession(engine) as session:
        for cid, cstate in new_state.items():
            existing = None
            for s in states:
                if s.collection_id == cid:
                    existing = s
                    break

            if existing:
                existing.asset_ids = cstate.get("asset_ids", [])
                existing.pending_asset_ids = cstate.get("pending_asset_ids", [])
                existing.collection_name = cstate.get("name", "")
                existing.shared = cstate.get("shared", False)
                session.add(existing)
            else:
                new_ts = NotificationTrackerState(
                    tracker_id=tracker_id,
                    collection_id=cid,
                    collection_name=cstate.get("name", ""),
                    shared=cstate.get("shared", False),
                    asset_ids=cstate.get("asset_ids", []),
                    pending_asset_ids=cstate.get("pending_asset_ids", []),
                )
                session.add(new_ts)

        for event in events:
            assets_count = event.added_count or event.removed_count or 0
            log = EventLog(
                tracker_id=tracker_id,
                tracker_name=tracker.name,
                provider_id=provider.id,
                provider_name=provider_name,
                event_type=event.event_type.value,
                collection_id=event.collection_id,
                collection_name=event.collection_name,
                assets_count=assets_count,
                details={
                    "added_count": event.added_count,
                    "removed_count": event.removed_count,
                    "provider_type": event.provider_type.value,
                },
            )
            session.add(log)

        await session.commit()

    # Dispatch notifications — per-link config resolution
    # Filter out empty events (e.g. assets_added with 0 added)
    events = [
        e for e in events
        if not (e.event_type.value == "assets_added" and e.added_count == 0)
        and not (e.event_type.value == "assets_removed" and e.removed_count == 0)
    ]

    _LOGGER.info(
        "Tracker %d: %d events after filter, %d links",
        tracker_id, len(events), len(link_data),
    )

    if events and link_data:
        url_cache, asset_cache = await _get_telegram_caches()
        dispatcher = NotificationDispatcher(url_cache=url_cache, asset_cache=asset_cache)
        for event in events:
            _LOGGER.info(
                "Dispatching event %s for %s (added=%d removed=%d)",
                event.event_type.value, event.collection_name,
                event.added_count, event.removed_count,
            )
            target_configs = []
            for ld in link_data:
                # Apply per-link event filtering from tracking config
                tc = ld["tracking_config"]
                if tc and not event_allowed_by_config(event, tc):
                    _LOGGER.info("  Skipped by tracking config filter")
                    continue

                tmpl = ld["template_config"]
                target_configs.append(TargetConfig(
                    type=ld["target_type"],
                    config=ld["target_config"],
                    template_slots=ld["template_slots"],
                    date_format=tmpl.date_format if tmpl else "%d.%m.%Y, %H:%M UTC",
                    date_only_format=tmpl.date_only_format if tmpl and tmpl.date_only_format else "%d.%m.%Y",
                    provider_api_key=provider_config.get("api_key"),
                    provider_internal_url=provider_config.get("url", ""),
                    provider_external_url=provider_config.get("external_domain", ""),
                    receivers=ld["receivers"],
                ))

            if target_configs:
                results = await dispatcher.dispatch(event, target_configs)
                for r in results:
                    if r.get("success"):
                        _LOGGER.info("  Notification sent successfully")
                    else:
                        _LOGGER.error("  Notification failed: %s", r.get("error", "unknown"))

    return {
        "status": "ok",
        "events_detected": len(events),
        "collections_checked": len(collection_ids),
    }