microblog.pub/app/outgoing_activities.py

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2022-06-22 18:11:22 +00:00
import email
import time
import traceback
from datetime import datetime
from datetime import timedelta
import httpx
from loguru import logger
from sqlalchemy.orm import Session
from app import activitypub as ap
from app import models
from app.database import SessionLocal
from app.database import now
_MAX_RETRIES = 16
def new_outgoing_activity(
db: Session,
recipient: str,
outbox_object_id: int,
) -> models.OutgoingActivity:
outgoing_activity = models.OutgoingActivity(
recipient=recipient,
outbox_object_id=outbox_object_id,
)
db.add(outgoing_activity)
db.commit()
db.refresh(outgoing_activity)
return outgoing_activity
def _parse_retry_after(retry_after: str) -> datetime | None:
try:
# Retry-After: 120
seconds = int(retry_after)
except ValueError:
# Retry-After: Wed, 21 Oct 2015 07:28:00 GMT
dt_tuple = email.utils.parsedate_tz(retry_after)
if dt_tuple is None:
return None
seconds = int(email.utils.mktime_tz(dt_tuple) - time.time())
return now() + timedelta(seconds=seconds)
def _exp_backoff(tries: int) -> datetime:
seconds = 2 * (2 ** (tries - 1))
return now() + timedelta(seconds=seconds)
def _set_next_try(
outgoing_activity: models.OutgoingActivity,
next_try: datetime | None = None,
) -> None:
if not outgoing_activity.tries:
raise ValueError("Should never happen")
if outgoing_activity.tries == _MAX_RETRIES:
outgoing_activity.is_errored = True
outgoing_activity.next_try = None
else:
outgoing_activity.next_try = next_try or _exp_backoff(outgoing_activity.tries)
def process_next_outgoing_activity(db: Session) -> bool:
q = (
db.query(models.OutgoingActivity)
.filter(
models.OutgoingActivity.next_try <= now(),
models.OutgoingActivity.is_errored.is_(False),
models.OutgoingActivity.is_sent.is_(False),
)
.order_by(models.OutgoingActivity.next_try)
)
q_count = q.count()
logger.info(f"{q_count} outgoing activities ready to process")
if not q_count:
logger.info("No activities to process")
return False
next_activity = q.limit(1).one()
next_activity.tries = next_activity.tries + 1
next_activity.last_try = now()
payload = ap.wrap_object_if_needed(next_activity.outbox_object.ap_object)
logger.info(f"{payload=}")
try:
resp = ap.post(next_activity.recipient, payload)
except httpx.HTTPStatusError as http_error:
logger.exception("Failed")
next_activity.last_status_code = http_error.response.status_code
next_activity.last_response = http_error.response.text
next_activity.error = traceback.format_exc()
if http_error.response.status_code in [429, 503]:
retry_after: datetime | None = None
if retry_after_value := http_error.response.headers.get("Retry-After"):
retry_after = _parse_retry_after(retry_after_value)
_set_next_try(next_activity, retry_after)
elif 400 <= http_error.response.status_code < 500:
logger.info(f"status_code={http_error.response.status_code} not retrying")
next_activity.is_errored = True
next_activity.next_try = None
else:
_set_next_try(next_activity)
except Exception:
logger.exception("Failed")
next_activity.error = traceback.format_exc()
_set_next_try(next_activity)
else:
logger.info("Success")
next_activity.is_sent = True
next_activity.last_status_code = resp.status_code
next_activity.last_response = resp.text
db.commit()
return True
def loop() -> None:
db = SessionLocal()
while 1:
try:
process_next_outgoing_activity(db)
except Exception:
logger.exception("Failed to process next outgoing activity")
raise
time.sleep(1)
if __name__ == "__main__":
loop()