logs and metrics permissions, tolerant record decode, hive capabilities

hive-c0re/src/swarm_status.rs

@@ -396,15 +396,29 @@ pub(crate) fn queue_first_deploy(
     coord.job_queue.insert_first_deploy_once(agent)
 }
 
-/// Offer one snapshot: this hive's current readiness, under its own key.
+/// The snapshot a hive offers: its readiness, and what it can do (`swarm_wire::hive_status`).
+#[derive(serde::Serialize)]
+struct Snapshot {
+    #[serde(flatten)]
+    readiness: crate::warnings::Readiness,
+    capabilities: &'static [&'static str],
+}
+
+fn snapshot() -> Snapshot {
+    Snapshot {
+        readiness: crate::warnings::readiness(),
+        capabilities: &[swarm_wire::hive_status::TOLERANT_PERMISSIONS],
+    }
+}
+
+/// Offer one snapshot under this hive's own key.
 async fn publish(client: &async_nats::Client, hive: &str) -> Result<()> {
     // An unconnected client does not fail a JetStream request, it hangs
     // on it — which here would hang the loop, shutdown arm included.
     swarm_queue_client::ensure_connected(client)?;
 
     let store = swarm_queue_client::status::open_or_create(client).await?;
-    let payload =
-        serde_json::to_vec(&crate::warnings::readiness()).context("serialising the readiness")?;
+    let payload = serde_json::to_vec(&snapshot()).context("serialising the snapshot")?;
     store
         .put(hive, payload.into())
         .await
@@ -427,3 +441,20 @@ mod rev_marker_tests {
         assert!(!marker_holds(&marker, "bbb"), "another rev still deploys");
     }
 }
+
+#[cfg(test)]
+mod snapshot_tests {
+    use super::snapshot;
+
+    /// The controller reads the capability out of the published bytes with
+    /// the wire type, and the readiness keeps its own top-level fields.
+    #[test]
+    fn the_snapshot_advertises_tolerant_permissions_beside_the_readiness() {
+        let value = serde_json::to_value(snapshot()).unwrap();
+        assert!(
+            swarm_wire::hive_status::Capabilities::of_snapshot(&value)
+                .has(swarm_wire::hive_status::TOLERANT_PERMISSIONS)
+        );
+        assert!(value.get("status").is_some() && value.get("warnings").is_some());
+    }
+}