fix the nil reference issue, just add the error handle logic (#194)

Author: alonlong

pkg/convert/parser.go

@@ -13,7 +13,10 @@ import (
 
 // format is a Serialized trie (see transporttrie.Serialize implementation)
 func ParseTrie(r io.Reader, cb func(name []byte, val int)) error {
-	t, _ := transporttrie.Deserialize(r)
+	t, err := transporttrie.Deserialize(r)
+	if err != nil {
+		return err
+	}
 	t.Iterate(func(name []byte, val uint64) {
 		cb(name, int(val))
 	})

pkg/server/ingest.go

@@ -28,9 +28,11 @@ type ingestParams struct {
 func wrapConvertFunction(convertFunc func(r io.Reader, cb func(name []byte, val int)) error) func(io.Reader) (*tree.Tree, error) {
 	return func(r io.Reader) (*tree.Tree, error) {
 		t := tree.New()
-		convertFunc(r, func(k []byte, v int) {
+		if err := convertFunc(r, func(k []byte, v int) {
 			t.Insert(k, uint64(v))
-		})
+		}); err != nil {
+			return nil, err
+		}
 
 		return t, nil
 	}