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fix(gateway): add media download retry to Mattermost, Slack, and base cache (#3323)

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* fix(gateway): add media download retry to Mattermost, Slack, and base cache

Media downloads on Mattermost and Slack fail permanently on transient
errors (timeouts, 429 rate limits, 5xx server errors). Telegram and
WhatsApp already have retry logic, but these platforms had single-attempt
downloads with hardcoded 30s timeouts.

Changes:
- base.py cache_image_from_url: add retry with exponential backoff
  (covers Signal and any platform using the shared cache helper)
- mattermost.py _send_media_url: retry on 429/5xx/timeout (3 attempts)
- slack.py _download_slack_file: retry on timeout/5xx (3 attempts)
- slack.py _download_slack_file_bytes: same retry pattern

* test: add tests for media download retry

---------

Co-authored-by: dieutx <dangtc94@gmail.com>
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Teknium 2026-03-26 19:33:18 -07:00 • committed by GitHub
parent 58ca875e19
commit a2847ea7f0
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4 changed files with 672 additions and 42 deletions
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42
gateway/platforms/mattermost.py
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@ -407,18 +407,38 @@ class MattermostAdapter(BasePlatformAdapter):
kind: str = "file",
) -> SendResult:
"""Download a URL and upload it as a file attachment."""
import asyncio
import aiohttp
try:
async with self._session.get(url, timeout=aiohttp.ClientTimeout(total=30)) as resp:
if resp.status >= 400:
# Fall back to sending the URL as text.
return await self.send(chat_id, f"{caption or ''}\n{url}".strip(), reply_to)
file_data = await resp.read()
ct = resp.content_type or "application/octet-stream"
# Derive filename from URL.
fname = url.rsplit("/", 1)[-1].split("?")[0] or f"{kind}.png"
except Exception as exc:
logger.warning("Mattermost: failed to download %s: %s", url, exc)
last_exc = None
file_data = None
ct = "application/octet-stream"
fname = url.rsplit("/", 1)[-1].split("?")[0] or f"{kind}.png"
for attempt in range(3):
try:
async with self._session.get(url, timeout=aiohttp.ClientTimeout(total=30)) as resp:
if resp.status >= 500 or resp.status == 429:
if attempt < 2:
logger.debug("Mattermost download retry %d/2 for %s (status %d)",
attempt + 1, url[:80], resp.status)
await asyncio.sleep(1.5 * (attempt + 1))
continue
if resp.status >= 400:
return await self.send(chat_id, f"{caption or ''}\n{url}".strip(), reply_to)
file_data = await resp.read()
ct = resp.content_type or "application/octet-stream"
break
except (aiohttp.ClientError, asyncio.TimeoutError) as exc:
last_exc = exc
if attempt < 2:
await asyncio.sleep(1.5 * (attempt + 1))
continue
logger.warning("Mattermost: failed to download %s after %d attempts: %s", url, attempt + 1, exc)
return await self.send(chat_id, f"{caption or ''}\n{url}".strip(), reply_to)
if file_data is None:
logger.warning("Mattermost: download returned no data for %s", url)
return await self.send(chat_id, f"{caption or ''}\n{url}".strip(), reply_to)
file_id = await self._upload_file(chat_id, file_data, fname, ct)