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fix(fabric): use broadcast subject for NATS capabilities discovery

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NATS wildcards (node.*.capabilities.get) only work for subscriptions,
not for publish. Switch to a dedicated broadcast subject
(fabric.capabilities.discover) that all NCS instances subscribe to,
enabling proper scatter-gather discovery across nodes.

Made-with: Cursor
This commit is contained in:
Apple
2026-02-27 03:20:13 -08:00
parent a6531507df
commit 90080c632a
28 changed files with 8883 additions and 1459 deletions
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4
services/node-capabilities/main.py
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@@ -275,6 +275,7 @@ async def report_latency_endpoint(request: Request):
ENABLE_NATS = os.getenv("ENABLE_NATS_CAPS", "false").lower() in ("true", "1", "yes")
NATS_URL = os.getenv("NATS_URL", "nats://dagi-nats:4222")
NATS_SUBJECT = f"node.{NODE_ID.lower()}.capabilities.get"
NATS_BROADCAST_SUBJECT = "fabric.capabilities.discover"
_nats_client = None
@@ -304,7 +305,8 @@ async def startup_nats():
import nats as nats_lib
_nats_client = await nats_lib.connect(NATS_URL)
await _nats_client.subscribe(NATS_SUBJECT, cb=_nats_capabilities_handler)
logger.info(f"✅ NATS subscribed: {NATS_SUBJECT} on {NATS_URL}")
await _nats_client.subscribe(NATS_BROADCAST_SUBJECT, cb=_nats_capabilities_handler)
logger.info(f"✅ NATS subscribed: {NATS_SUBJECT} + {NATS_BROADCAST_SUBJECT} on {NATS_URL}")
except Exception as e:
logger.warning(f"⚠️ NATS init failed (non-fatal): {e}")
_nats_client = None