99 lines
3.2 KiB
Python
99 lines
3.2 KiB
Python
"""Geo re-resolve background task.
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Registers an APScheduler job that periodically retries IP addresses in the
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``geo_cache`` table whose ``country_code`` is ``NULL``. These are IPs that
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previously failed to resolve (e.g. due to ip-api.com rate limiting) and were
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recorded as negative entries.
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The task runs every 10 minutes. On each invocation it:
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1. Queries all ``NULL``-country rows from ``geo_cache``.
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2. Clears the in-memory negative cache so those IPs are eligible for a fresh
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API attempt.
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3. Delegates to :func:`~app.services.geo_service.lookup_batch` which already
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handles rate-limit throttling and retries.
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4. Logs how many IPs were retried and how many resolved successfully.
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"""
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from __future__ import annotations
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from typing import TYPE_CHECKING
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import structlog
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from app.services import geo_service
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if TYPE_CHECKING:
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from fastapi import FastAPI
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log: structlog.stdlib.BoundLogger = structlog.get_logger()
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#: How often the re-resolve job fires (seconds). 10 minutes.
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GEO_RE_RESOLVE_INTERVAL: int = 600
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#: Stable APScheduler job ID — ensures re-registration replaces, not duplicates.
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JOB_ID: str = "geo_re_resolve"
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async def _run_re_resolve(app: "FastAPI") -> None:
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"""Query NULL-country IPs from the database and re-resolve them.
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Reads shared resources from ``app.state`` and delegates to
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:func:`~app.services.geo_service.lookup_batch`.
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Args:
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app: The :class:`fastapi.FastAPI` application instance passed via
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APScheduler ``kwargs``.
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"""
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db = app.state.db
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http_session = app.state.http_session
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# Fetch all IPs with NULL country_code from the persistent cache.
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unresolved_ips = await geo_service.get_unresolved_ips(db)
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if not unresolved_ips:
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log.debug("geo_re_resolve_skip", reason="no_unresolved_ips")
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return
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log.info("geo_re_resolve_start", unresolved=len(unresolved_ips))
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# Clear the negative cache so these IPs are eligible for fresh API calls.
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geo_service.clear_neg_cache()
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# lookup_batch handles throttling, retries, and persistence when db is
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# passed. This is a background task so DB writes are allowed.
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results = await geo_service.lookup_batch(unresolved_ips, http_session, db=db)
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resolved_count: int = sum(
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1 for info in results.values() if info.country_code is not None
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)
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log.info(
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"geo_re_resolve_complete",
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retried=len(unresolved_ips),
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resolved=resolved_count,
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)
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def register(app: FastAPI) -> None:
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"""Add (or replace) the geo re-resolve job in the application scheduler.
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Must be called after the scheduler has been started (i.e., inside the
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lifespan handler, after ``scheduler.start()``).
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The first invocation is deferred by one full interval so the initial
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blocklist prewarm has time to finish before re-resolve kicks in.
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Args:
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app: The :class:`fastapi.FastAPI` application instance whose
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``app.state.scheduler`` will receive the job.
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"""
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app.state.scheduler.add_job(
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_run_re_resolve,
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trigger="interval",
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seconds=GEO_RE_RESOLVE_INTERVAL,
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kwargs={"app": app},
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id=JOB_ID,
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replace_existing=True,
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)
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log.info("geo_re_resolve_scheduled", interval_seconds=GEO_RE_RESOLVE_INTERVAL)
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