forked from asdine/storm
/
save.go
137 lines (114 loc) · 2.42 KB
/
save.go
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package storm
import (
"bytes"
"reflect"
"github.com/asdine/storm/index"
"github.com/boltdb/bolt"
)
// Save a structure
func (n *node) Save(data interface{}) error {
ref := reflect.ValueOf(data)
if !ref.IsValid() || ref.Kind() != reflect.Ptr || ref.Elem().Kind() != reflect.Struct {
return ErrStructPtrNeeded
}
info, err := extract(&ref)
if err != nil {
return err
}
var id []byte
if info.ID.IsZero {
if !info.ID.IsOfIntegerFamily() || !n.s.autoIncrement {
return ErrZeroID
}
} else {
id, err = toBytes(info.ID.Value.Interface(), n.s.codec)
if err != nil {
return err
}
}
var raw []byte
// postpone encoding if AutoIncrement mode if enabled
if !n.s.autoIncrement {
raw, err = n.s.codec.Encode(data)
if err != nil {
return err
}
}
if n.tx != nil {
return n.save(n.tx, info, id, raw, data)
}
return n.s.Bolt.Update(func(tx *bolt.Tx) error {
return n.save(tx, info, id, raw, data)
})
}
func (n *node) save(tx *bolt.Tx, info *modelInfo, id []byte, raw []byte, data interface{}) error {
bucket, err := n.CreateBucketIfNotExists(tx, info.Name)
if err != nil {
return err
}
if info.ID.IsZero {
// isZero and integer, generate next sequence
intID, _ := bucket.NextSequence()
// convert to the right integer size
info.ID.Value.Set(reflect.ValueOf(intID).Convert(info.ID.Type()))
id, err = toBytes(info.ID.Value.Interface(), n.s.codec)
if err != nil {
return err
}
}
if data != nil {
if n.s.autoIncrement {
raw, err = n.s.codec.Encode(data)
if err != nil {
return err
}
}
}
for fieldName, idxInfo := range info.Indexes {
idx, err := getIndex(bucket, idxInfo.Type, fieldName)
if err != nil {
return err
}
if idxInfo.IsZero {
err = idx.RemoveID(id)
if err != nil {
return err
}
continue
}
value, err := toBytes(idxInfo.Value.Interface(), n.s.codec)
if err != nil {
return err
}
var found bool
idsSaved, err := idx.All(value, nil)
if err != nil {
return err
}
for _, idSaved := range idsSaved {
if bytes.Compare(idSaved, id) == 0 {
found = true
break
}
}
if found {
continue
}
err = idx.RemoveID(id)
if err != nil {
return err
}
err = idx.Add(value, id)
if err != nil {
if err == index.ErrAlreadyExists {
return ErrAlreadyExists
}
return err
}
}
return bucket.Put(id, raw)
}
// Save a structure
func (s *DB) Save(data interface{}) error {
return s.root.Save(data)
}