fix warp RPC service

Author: Ivan Sukach

vm/vm.go

@@ -490,11 +490,11 @@ func (vm *LandslideVM) Initialize(_ context.Context, req *vmpb.InitializeRequest
 	}
 	rpcClients := make(map[ids.NodeID]warp.Client)
 	for id, nodeURI := range vm.config.AddressBook {
-		nodeID, err := ids.ToNodeID([]byte(id))
+		nodeID, err := ids.NodeIDFromString(id)
 		if err != nil {
 			return nil, fmt.Errorf("failed to parse node ID: %w", err)
 		}
-		rpcClient, err := warp.NewClient(fmt.Sprintf("%s/ext/bc/%s/rpc", nodeURI, string(req.ChainId)))
+		rpcClient, err := warp.NewClient(fmt.Sprintf("%s/ext/bc/%s/rpc", nodeURI, chainID.String()))
 		if err != nil {
 			return nil, fmt.Errorf("failed to create warp client: %w", err)
 		}

vm/warp_service.go

@@ -39,6 +39,10 @@ type ResultGetMessageSignature struct {
 	Signature []byte `json:"signature"`
 }
 
+type ResultGetBlockSignature struct {
+	Signature []byte `json:"signature"`
+}
+
 // API introduces snowman specific functionality to the evm
 type API struct {
 	vm                            *LandslideVM
@@ -123,12 +127,12 @@ func (a *API) GetMessageAggregateSignature(ctx context.Context, messageID ids.ID
 }
 
 // GetBlockSignature returns the BLS signature associated with a blockID.
-func (a *API) GetBlockSignature(ctx context.Context, blockID ids.ID) (tmbytes.HexBytes, error) {
+func (a *API) GetBlockSignature(ctx context.Context, blockID ids.ID) (*ResultGetBlockSignature, error) {
 	signature, err := a.backend.GetBlockSignature(blockID)
 	if err != nil {
 		return nil, fmt.Errorf("failed to get signature for block %s with error %w", blockID, err)
 	}
-	return signature, nil
+	return &ResultGetBlockSignature{Signature: signature}, nil
 }
 
 // GetBlockAggregateSignature fetches the aggregate signature for the requested [blockID]