jameshartig commented on code in PR #1855:
URL:
https://github.com/apache/cassandra-gocql-driver/pull/1855#discussion_r2127475953
##########
marshal.go:
##########
@@ -1909,92 +2008,113 @@ func marshalMap(info TypeInfo, value interface{})
([]byte, error) {
buf := &bytes.Buffer{}
n := rv.Len()
- if err := writeCollectionSize(mapInfo, n, buf); err != nil {
+ if err := writeCollectionSize(c.proto, n, buf); err != nil {
return nil, err
}
keys := rv.MapKeys()
for _, key := range keys {
- item, err := Marshal(mapInfo.Key, key.Interface())
+ item, err := Marshal(c.Key, key.Interface())
if err != nil {
return nil, err
}
itemLen := len(item)
// Set the key to null for supported protocols
- if item == nil && mapInfo.proto > protoVersion2 {
+ if item == nil && c.proto > protoVersion2 {
itemLen = -1
}
- if err := writeCollectionSize(mapInfo, itemLen, buf); err !=
nil {
+ if err := writeCollectionSize(c.proto, itemLen, buf); err !=
nil {
return nil, err
}
buf.Write(item)
- item, err = Marshal(mapInfo.Elem, rv.MapIndex(key).Interface())
+ item, err = Marshal(c.Elem, rv.MapIndex(key).Interface())
if err != nil {
return nil, err
}
itemLen = len(item)
// Set the value to null for supported protocols
- if item == nil && mapInfo.proto > protoVersion2 {
+ if item == nil && c.proto > protoVersion2 {
itemLen = -1
}
- if err := writeCollectionSize(mapInfo, itemLen, buf); err !=
nil {
+ if err := writeCollectionSize(c.proto, itemLen, buf); err !=
nil {
return nil, err
}
buf.Write(item)
}
return buf.Bytes(), nil
}
-func unmarshalMap(info TypeInfo, data []byte, value interface{}) error {
- mapInfo, ok := info.(CollectionType)
- if !ok {
- return unmarshalErrorf("unmarshal: can not unmarshal none
collection type into map")
- }
-
+func (c CollectionType) unmarshalMap(data []byte, value interface{}) error {
rv := reflect.ValueOf(value)
if rv.Kind() != reflect.Ptr {
- return unmarshalErrorf("can not unmarshal into non-pointer %T",
value)
+ return unmarshalErrorf("can not unmarshal map into non-pointer
%T", value)
}
rv = rv.Elem()
t := rv.Type()
- if t.Kind() != reflect.Map {
- return unmarshalErrorf("can not unmarshal %s into %T", info,
value)
+ if t.Kind() == reflect.Interface {
+ if t.NumMethod() != 0 {
+ return unmarshalErrorf("can not unmarshal map into
non-empty interface %T", value)
+ }
+ var key interface{}
+ // this relies on Unmarshal marshalling default values when
presented with nil
+ if err := Unmarshal(c.Key, []byte(nil), &key); err != nil {
+ return err
+ }
+ if key == nil {
+ panic(fmt.Errorf("key was nil after unmarshalling from
%T", c.Key))
Review Comment:
I'll go through and either comment or replace all of them, thanks for the
reminder!
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