go/consensus: Show a list of available checkpoints

Author: martintomazic

.changelog/5265.feature.md

@@ -0,0 +1,6 @@
+go/oasis-node: Display consensus checkpoint heights
+
+A new field `checkpoint_heights` has been added to the
+`oasis-node control status` output under the `consensus` status section.
+Unless node has no local checkpoints, this field displays a list of local
+checkpoint heights.

go/consensus/api/api.go

@@ -375,6 +375,9 @@ type Status struct { // nolint: maligned
 
 	// P2P is the P2P status of the node.
 	P2P *P2PStatus `json:"p2p,omitempty"`
+
+	// CheckpointHeights is the list of node's local checkpoint heights.
+	CheckpointHeights []uint64 `json:"checkpoint_heights,omitempty"`
 }
 
 // P2PStatus is the P2P status of a node.

go/consensus/cometbft/full/common.go

@@ -840,6 +840,18 @@ func (n *commonNode) GetStatus(ctx context.Context) (*consensusAPI.Status, error
 			// Failed to load validator set.
 			status.IsValidator = false
 		}
+
+		cps, err := n.mux.State().Storage().GetCheckpoints(ctx, &checkpoint.GetCheckpointsRequest{
+			Version: 1,
+		})
+		switch err {
+		case nil:
+			for _, cp := range cps {
+				status.CheckpointHeights = append(status.CheckpointHeights, cp.Root.Version)
+			}
+		default:
+			return nil, fmt.Errorf("failed to fetch checkpoints: %w", err)
+		}
 	}
 
 	return status, nil