One more RPC (get_server_height), and update comment

to include full RPC name.

server/jsonrpc_blockchain.go

@@ -87,6 +87,18 @@ func min[Ord constraints.Ordered](x, y Ord) Ord {
 	return y
 }
 
+type BlockGetServerHeightReq struct{}
+type BlockGetServerHeightResp uint32
+
+func (s *BlockchainService) Get_server_height(r *http.Request, req *BlockGetServerHeightReq, resp **BlockGetServerHeightResp) error {
+	if s.DB == nil || s.DB.LastState == nil {
+		return fmt.Errorf("unknown height")
+	}
+	result := BlockGetServerHeightResp(s.DB.LastState.Height)
+	*resp = &result
+	return nil
+}
+
 type BlockGetChunkReq uint32
 type BlockGetChunkResp string
 

server/jsonrpc_blockchain_test.go

@@ -8,6 +8,36 @@ import (
 	"github.com/lbryio/lbcd/chaincfg"
 )
 
+func TestServerGetHeight(t *testing.T) {
+	dbPath := "/Users/swdev1/hub/scribe_db.599529/lbry-rocksdb"
+	// dbPath := "/mnt/d/data/snapshot_1072108/lbry-rocksdb/"
+	secondaryPath := "asdf"
+	db, toDefer, err := db.GetProdDB(dbPath, secondaryPath)
+	defer toDefer()
+	if err != nil {
+		t.Skip("DB not found")
+		t.Error(err)
+		return
+	}
+
+	s := &BlockchainService{
+		DB:    db,
+		Chain: &chaincfg.MainNetParams,
+	}
+
+	req := BlockGetServerHeightReq{}
+	var resp *BlockGetServerHeightResp
+	err = s.Get_server_height(nil, &req, &resp)
+	if err != nil {
+		t.Errorf("handler err: %v", err)
+	}
+	marshalled, err := json.MarshalIndent(resp, "", "    ")
+	if err != nil {
+		t.Errorf("unmarshal err: %v", err)
+	}
+	t.Logf("resp: %v", string(marshalled))
+}
+
 func TestGetChunk(t *testing.T) {
 	dbPath := "/Users/swdev1/hub/scribe_db.599529/lbry-rocksdb"
 	// dbPath := "/mnt/d/data/snapshot_1072108/lbry-rocksdb/"

server/jsonrpc_service.go

@@ -23,7 +23,7 @@ type Result struct {
 	Data string `json:"data"`
 }
 
-// Resolve is the json rpc endpoint for resolve
+// Resolve is the json rpc endpoint for 'blockchain.claimtrie.resolve'.
 func (t *ClaimtrieService) Resolve(r *http.Request, args *ResolveData, result **pb.Outputs) error {
 	log.Println("Resolve")
 	res, err := InternalResolve(args.Data, t.DB)