wire GetBlocks into blockservice

offline.go

@@ -30,7 +30,7 @@ func (_ *offlineExchange) GetBlock(context.Context, u.Key) (*blocks.Block, error
 }
 
 // HasBlock always returns nil.
-func (_ *offlineExchange) HasBlock(context.Context, blocks.Block) error {
+func (_ *offlineExchange) HasBlock(context.Context, *blocks.Block) error {
 	return nil
 }
 
@@ -38,3 +38,7 @@ func (_ *offlineExchange) HasBlock(context.Context, blocks.Block) error {
 func (_ *offlineExchange) Close() error {
 	return nil
 }
+
+func (_ *offlineExchange) GetBlocks(context.Context, []u.Key) (<-chan *blocks.Block, error) {
+	return nil, OfflineMode
+}

offline_test.go

@@ -21,7 +21,7 @@ func TestBlockReturnsErr(t *testing.T) {
 func TestHasBlockReturnsNil(t *testing.T) {
 	off := Exchange()
 	block := blocks.NewBlock([]byte("data"))
-	err := off.HasBlock(context.Background(), *block)
+	err := off.HasBlock(context.Background(), block)
 	if err != nil {
 		t.Fatal("")
 	}