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WalkthroughNotification queues now use bounded capacity and delivery reservations with acknowledgement, retry, and delayed release. Discord, Telegram, and webhook workers process bounded workloads. Tests cover queue limits, retries, stream configuration, and reminder cleanup. ChangesNotification delivery
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant Dispatcher
participant NotificationQueue
participant process_notification
participant _post_notification
participant HTTP endpoint
Dispatcher->>NotificationQueue: dequeue delivery
NotificationQueue-->>Dispatcher: delivery reservation
Dispatcher->>process_notification: process delivery
process_notification->>_post_notification: make one request attempt
_post_notification->>HTTP endpoint: POST notification
HTTP endpoint-->>_post_notification: response
_post_notification-->>process_notification: success or retry delay
alt Request succeeds or attempts are exhausted
process_notification->>NotificationQueue: acknowledge delivery
else Another attempt remains
process_notification->>NotificationQueue: retry with updated attempt and schedule
end
Suggested reviewers: Merge Risk: 🔵 Low · up to The bounded delivery changes look mostly sound. One narrow edge case remains open: an in-memory webhook retry may fail after the request is already sent, which could cause duplicate deliveries under a full retry budget. Mergeable with owner awareness. Security Architecture Review
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Docstring coverage is 12.21% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 131 functions across 9 files. (1 skipped:… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the main changes: bounded notification processing and recovery through retry and reservation handling. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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Docstring coverage is 12.21% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 131 functions across 9 files. (1 skipped: 1 unsupported.)
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Actionable comments posted: 3
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In @app/notification/nats_queue.py:
- Around line 87-92: Update NATS retry handling in `retry` so a full stream
cannot cause the original message to be NAKed and redelivered unchanged. Ensure
replacement publishes have capacity despite the unacked original—for example,
reserve stream headroom for retries or route retries to a separately limited
stream—while preserving the updated retry state and pending-webhook list.
- Around line 271-276: Update the notification dispatch awaited by
APIKeyOperation to use the existing exception-logging helper so queue-full and
rejected-publish failures are logged without propagating after the database
commit; apply this to create, modify, and delete notifications.
In @app/notification/queue_manager.py:
- Around line 138-145: Update enqueue_webhook() to stop loading
webhook_settings() and snapshotting URLs into pending_webhooks; leave
pending_webhooks unset so _send_batch() uses the configured webhooks at delivery
time, including for retries.
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app/jobs/process_notification_queues.pyapp/jobs/send_notifications.pyapp/notification/client.pyapp/notification/nats_queue.pyapp/notification/queue_manager.py
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @app/notification/nats_queue.py:
- Around line 379-387: Update Nats queue item preparation in prepare so the
reserved retry capacity is always at least RETRY_METADATA_RESERVE, including
when the prepared item is smaller than the original. Preserve accounting for the
item’s size and any existing retry_size so capacity rejection occurs during
preparation.
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app/jobs/send_notifications.pyapp/notification/client.pyapp/notification/nats_queue.pyapp/notification/queue_manager.py
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The bounded queues reject new work when they are full: the in-memory queue raises asyncio.QueueFull and a full JetStream stream (DiscardPolicy NEW) rejects the publish with "maximum messages/bytes exceeded" (err_code 10077). That error reached the callers. Request paths are wrapped, but scheduled jobs are not: review_users' data-usage and days-left jobs call bulk_notify right after bulk_create_notification_reminders, so a full queue aborted the job and the recorded reminders were never sent. NatsNotificationQueue.enqueue now reports a full stream as asyncio.QueueFull, like the in-memory queue, and every enqueue helper (webhook, Telegram, Discord) catches it and logs a dropped notification instead of raising. Other publish errors still propagate.
delete_expired_reminders ran its DELETE inside GetDB, which never commits, so the session rolled it back on close and expired reminders were never removed.
…eam settlement Regression tests for the reworked notification delivery, with no NATS server or outside network: JetStream is an in-process fake that honours expected-sequence headers, one message per subject and stream limits, and webhook/Discord endpoints are a local aiohttp server on 127.0.0.1. - In-memory queue: count and byte bounds, reservations that hold capacity until acked, release of unsettled deliveries, delayed items that do not block ready ones, the retry metadata budget. - Webhook pipeline on both backends: batches capped at 50 and runs at 10 batches, a partial failure retries only the failed destination with no duplicates at the healthy one, exhaustion after `recurrent` attempts drops the event, future send_at, removed destinations; queue counters (or streams) end empty. - JetStream: ack only after the webhook accepted the batch, NAK when unsettled, retry checkpoint written, read back on redelivery and marked completed before the ack, completed checkpoint acked without a resend, no retry headroom defers the delivery, malformed messages discarded. - Startup: bounded WorkQueue streams for new installs, producers only update the stream, shared streams, incompatible retry streams and missing retry headroom fail startup. - Discord: a 429 retry_after becomes a queue delay, max_retries drops.
… and permissions Operators of split-role or restricted-credential NATS deployments need to know what the bounded notification queues change: - each notification stream must carry only its subject and at most its named consumer, or startup fails; - streams are bounded and a full stream drops new notifications with a log line; - the scheduler keeps retry state in "<STREAM>_RETRY_STATE" on "<SUBJECT>.retry_state.*", and startup fails if that stream has another layout or no headroom; - the JetStream API permissions every role and the scheduler now need. The notes sit next to the NATS_NOTIFICATION_* and NATS_WEBHOOK_* settings in .env.example, where these streams are configured.
The webhook job fetched each delivery with a 50 ms timeout. Over a JetStream link with about 60 ms of round-trip time every fetch timed out, so a run delivered nothing on its first pass and then about one webhook per run. Use the one-second timeout that dev uses.
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Summary
Webhook processing previously drained the entire queue before sending, acknowledged JetStream messages before HTTP delivery, and treated one successful destination as success for every destination. Sustained traffic could delay delivery and grow memory; interruption could lose pending work, and partially failed deliveries were never retried.
Only five production Python files change. No documentation, test, dependency, configuration, or migration files are included.
Type of change
Validation
72 tests passed: 56 temporary regression cases outside the repository plus 16 existing tests in
test_create_app_nats_guard.py,test_ssl_context.py, andtest_notification_dedup.py.Coverage includes a 10,000-message backlog, batch/run/concurrency limits, real local HTTP partial failures, cancellation recovery, delayed and malformed records, retry exhaustion, destination changes, full memory queues, NATS checkpoint persistence before release, ambiguous publish/ack outcomes, byte/message saturation, concurrent checkpoint admission, stale-writer rejection, orphan cleanup, heartbeat/flush failure, legacy-stream handling, and initialization failures.
Ruff lint/format and
git diff --checkpass for the changed files. NATS broker calls were simulated, with the saturation model checked against upstream server storage code, including v2.11.9. Live JetStream integration remains unverified: downloading the official Windows server binary repeatedly failed with TLS connection timeouts. HTTP tests used a real local aiohttp server.Review findings
Fixed retry-state loss at stream capacity: retries update durable checkpoints rather than republishing into the full input stream. Capacity is reserved before sending; work that cannot reserve a checkpoint is deferred without starting HTTP delivery.
Removed the enqueue-time webhook settings lookup. First delivery selects configured URLs; retries retain only failed URLs, so newly added destinations do not reintroduce already-successful deliveries.
Addressed failed reservation-renewal handling by interrupting active work.
The reported API-key HTTP 500 propagation does not occur:
create_api_key,modify_api_key, andremove_api_keyare already wrapped by_safe_notification_task. Six regression cases verified that queue-full and rejected-publication errors are caught for all three entry points. No unrelated change was made to those functions.Fixed the subsequent architecture-review startup concern: validate the companion stream configuration, reclaim orphaned checkpoints before enforcing the occupancy gate, then re-read occupancy. Regression coverage includes stale records beyond the normal 100-record cleanup batch and retaining all live checkpoints when headroom cannot be recovered.
The subsequent inline claim about zero additional in-memory retry reservation was not reproduced in 12 full-budget cases (three amounts of removed destination data and four retry counters, including a 100-digit counter). The original message allocation remains charged: when preparation shrinks the serialized item by at least 128 bytes, that retained allocation already supplies the retry headroom. Actual webhook sends and partial-failure settlement succeeded with the separate retry budget fully occupied; successful destinations were excluded from the stored retry. Requiring another 128 bytes in this case would unnecessarily defer deliverable work, so that suggested change was not applied.
Operational notes
Delivery is at least once. An endpoint can receive a duplicate if a worker dies after the endpoint accepts a request but before the outcome is checkpointed. In-memory queues remain non-durable across process restarts.
Input queues default to 10,000 messages / 64 MiB. Each NATS scheduler also creates a dedicated
<stream>_RETRY_STATEstream on<subject>.retry_state.*, with limits derived from the input stream and its storage/replication settings. Half of its byte limit is reserved for updates; record admission accounts for storage/header overhead. Existing incompatible checkpoint streams fail startup. Occupied checkpoint streams first reclaim stale records, bounded by the observed record count; startup rejects them only if update headroom remains insufficient. Normal incremental cleanup remains limited to 100 records. In-memory retry metadata has a separate budget equal to the input byte limit.Scheduler credentials need access to the companion checkpoint stream/subject. Notification streams must be dedicated to their configured subject and consumer. Restart consumers together when deploying so older consumers do not use early acknowledgements or ignore checkpoint state. Legacy webhook records without destination metadata remain readable.
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