When a WhatsApp contact starts a new conversation by sending multiple
images at once (an album), each image arrives as a separate webhook.
Because no conversation exists yet, the concurrent workers each pass the
"does a conversation exist?" check and each create their own
conversation — producing one conversation per image instead of one
grouped conversation.
This fix serializes webhook processing per `(inbox, contact)` using a
Redis lock at the job level, so only one webhook at a time can create
the initial conversation for a given contact. Concurrent workers retry
with backoff and append to the same conversation once the lock is
released.
## Closes
- Closes#13261
## How to test
1. On a WhatsApp inbox, ensure there is no active (open) conversation
with a specific test contact — resolve or delete any existing one.
2. From a phone, select 6+ images in the WhatsApp gallery and send them
as a single album to the Chatwoot-connected number.
3. Open the Chatwoot dashboard and confirm exactly **one** new
conversation is created, with all images grouped under it.
4. Repeat the test with a mix of attachment types (XMLs, PDFs, images)
sent in rapid succession — still one conversation.
## What changed
- New Redis key `WHATSAPP_MESSAGE_CREATE_LOCK::<inbox_id>::<sender_id>`
in `lib/redis/redis_keys.rb`.
- `Webhooks::WhatsappEventsJob` now inherits from `MutexApplicationJob`
and wraps event processing in `with_lock(key)`, matching the pattern
already used by `FacebookEventsJob`, `InstagramEventsJob`, and
`TiktokEventsJob`.
- Uses `retry_on LockAcquisitionError, wait: 1.second, attempts: 8` so
concurrent webhooks retry until the lock is free instead of poll-waiting
inside the service.
- Sender ID is derived from the webhook payload (contact's `from`, or
`to` for SMB echo events); status-only webhooks bypass the lock.
- Issue 1 from the report (same `source_id` redelivery) was already
handled previously by `Whatsapp::MessageDedupLock` (atomic `SET NX EX`);
no changes needed there.
---------
Co-authored-by: Muhsin <12408980+muhsin-k@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
