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fix(web): on-demand no longer restarts a running display service (#676)

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POST /display/on-demand/start treated start_service (default true, sent by
"Preview on display", the on-demand dialog and the MQTT bridge) as
"restart": with the service running it ran systemctl stop, slept 1.5s and
started it again. Every request cold-started the display process -- every
plugin reloaded, panel blank -- to deliver a request the running process
already reads from the cache mailbox every ON_DEMAND_POLL_INTERVAL (0.25s),
including mid-dwell, mid-screen and mid-Vegas. The restart bought nothing:
startup only restores a session the display saved itself
(display_on_demand_config), so the new request arrived through the same
mailbox either way.

start_service now means "start it if it is not running". The stop route
coerces stop_service to a boolean so "false" no longer stops the service.
test_api_v3_on_demand_restart.py pinned the old restart path; it now pins
the replacement. Docs updated.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Chuck
2026-09-29 14:42:58 -04:00
committed by GitHub
co-authored by Claude Opus 5.5
parent da9a999102
commit c4c46d3ba7
5 changed files with 176 additions and 85 deletions
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docs/REST_API_REFERENCE.md
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@@ -390,7 +390,7 @@ Request a specific plugin to display on-demand.
- `mode` (string, optional): Display mode name (plugin_id inferred if not provided)
- `duration` (number, optional): Duration in seconds (0 = until stopped)
- `pinned` (boolean, optional): Pin display (pause rotation)
- `start_service` (boolean, optional): (Re)start the display service so it picks the request up (default: true)
- `start_service` (boolean, optional): Start the display service if it is not running (default: true). A running service is never restarted: it picks the request up within about a quarter of a second. When false and the service is stopped, the route returns 400.
**Response**:
```json