trustgraph/dev-tools
Cyber MacGeddon 2f713753e1 Config push notify pattern: replace stateful pub/sub with
signal+ fetch

Replace the config push mechanism that broadcast the full config
blob on a 'state' class pub/sub queue with a lightweight notify
signal containing only the version number and affected config
types. Processors fetch the full config via request/response from
the config service when notified.

This eliminates the need for the pub/sub 'state' queue class and
stateful pub/sub services entirely. The config push queue moves
from 'state' to 'flow' class — a simple transient signal rather
than a retained message.  This solves the RabbitMQ
late-subscriber problem where restarting processes never received
the current config because their fresh queue had no historical
messages.

Key changes:
- ConfigPush schema: config dict replaced with types list
- Subscribe-then-fetch startup with retry: processors subscribe
  to notify queue, fetch config via request/response, then
  process buffered notifies with version comparison to avoid race
  conditions
- register_config_handler() accepts optional types parameter so
  handlers only fire when their config types change
- Short-lived config request/response clients to avoid subscriber
  contention on non-persistent response topics
- Config service passes affected types through put/delete/flow
  operations
- Gateway ConfigReceiver rewritten with same notify pattern and
  retry loop
2026-04-06 16:49:10 +01:00
..
tests Additional agent DAG tests (#750) 2026-04-01 13:59:58 +01:00
library_client.py Config push notify pattern: replace stateful pub/sub with 2026-04-06 16:49:10 +01:00