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feat(ipc): control socket stage 3 - a state stream replaces polled cache keys (#735)

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Adds state.get / state.subscribe to the display's control socket (StateHub in src/ipc/server.py). The web interface holds one subscription per process (web_interface/display_state.py) and reads current-status, on-demand status, plugin runtime and /health's display_loop from it, falling back to the cache keys and heartbeat file. While the socket serves readers, display_current_state and plugin_runtime_snapshot are written less often (about 1.5 instead of 5 cache writes a minute for 15 s screens).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Chuck
2026-10-03 12:56:47 -04:00
committed by GitHub
co-authored by Claude Opus 5.5
parent 6bf7c3fa51
commit 515248b34e
16 changed files with 2487 additions and 97 deletions
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web_interface/blueprints/api_v3/__init__.py
+9 -1
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@@ -735,8 +735,16 @@ def _plugin_runtime_view():
Only a ``live`` view reports those facts; a stale, stopped or missing
snapshot answers None for them (see src/plugin_system/plugin_runtime.py).
The display's state stream over the control socket comes first
(``source: "socket"``); without it, the cache snapshot and the heartbeat
file (``source: "cache"``). Both are judged by the same rules.
"""
from src.plugin_system.plugin_runtime import read_plugin_runtime
from src.plugin_system.plugin_runtime import read_plugin_runtime, view_from_socket_state
from web_interface import display_state
view = view_from_socket_state(display_state.read_state())
if view is not None:
return view
return read_plugin_runtime(getattr(api_v3, 'cache_manager', None))