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oplookup.go
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oplookup.go
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package edb
import (
"bytes"
"fmt"
"reflect"
)
func Lookup[Row any](txh Txish, idx *Index, indexKey any) *Row {
tx := txh.DBTx()
if tbl := tx.Schema().TableByRow((*Row)(nil)); idx.table != tbl {
panic(fmt.Errorf("invalid index %v for table %v", idx.FullName(), tbl.Name()))
}
rowVal, _ := tx.LookupVal(idx, reflect.ValueOf(indexKey))
return valToRow[Row](rowVal)
}
func LookupKey[Key any](txh Txish, idx *Index, indexKey any) (Key, bool) {
tx := txh.DBTx()
if at, et := reflect.TypeOf((*Key)(nil)).Elem(), idx.table.KeyType(); at != et {
panic(fmt.Errorf("%s: LookupKey has incorrect return type %v, expected %v", idx.FullName(), at, et))
}
keyVal := tx.LookupKeyVal(idx, reflect.ValueOf(indexKey))
if keyVal.IsValid() {
return keyVal.Interface().(Key), true
} else {
var zero Key
return zero, false
}
}
func LookupExists(txh Txish, idx *Index, indexKey any) bool {
tx := txh.DBTx()
return tx.LookupExists(idx, reflect.ValueOf(indexKey))
}
func (tx *Tx) Lookup(idx *Index, indexKey any) any {
rowVal, _ := tx.LookupVal(idx, reflect.ValueOf(indexKey))
return valToAny(rowVal)
}
func (tx *Tx) LookupKey(idx *Index, indexKey any) any {
return valToAny(tx.LookupKeyVal(idx, reflect.ValueOf(indexKey)))
}
func (tx *Tx) LookupKeyVal(idx *Index, indexKeyVal reflect.Value) reflect.Value {
keyRaw := tx.lookupRawKeyByVal(idx, indexKeyVal)
result := keyRawToVal(keyRaw, idx.table)
if tx.isVerboseLoggingEnabled() {
if keyRaw != nil {
tx.db.logf("db: LOOKUP_KEY %s/%v => %v", idx.FullName(), loggableVal(indexKeyVal), loggableVal(result))
} else {
tx.db.logf("db: LOOKUP_KEY.NOTFOUND %s/%v", idx.FullName(), loggableVal(indexKeyVal))
}
}
return result
}
func (tx *Tx) LookupExists(idx *Index, indexKeyVal reflect.Value) bool {
keyRaw := tx.lookupRawKeyByVal(idx, indexKeyVal)
if tx.isVerboseLoggingEnabled() {
if keyRaw != nil {
tx.db.logf("db: LOOKUP_EXISTS.OK %s/%v", idx.FullName(), loggableVal(indexKeyVal))
} else {
tx.db.logf("db: LOOKUP_EXISTS.NOTFOUND %s/%v", idx.FullName(), loggableVal(indexKeyVal))
}
}
return keyRaw != nil
}
func (tx *Tx) LookupVal(idx *Index, indexKeyVal reflect.Value) (reflect.Value, ValueMeta) {
keyRaw := tx.lookupRawKeyByVal(idx, indexKeyVal)
if keyRaw == nil {
return reflect.Value{}, ValueMeta{}
}
row, rowMeta, err := tx.getRowValByRawKey(idx.table, keyRaw, true)
if err != nil {
panic(err)
}
if rowMeta.IsMissing() && tx.db.strict {
panic(fmt.Errorf("data error in %s: index entry points to missing record %x", idx.FullName(), keyRaw))
}
if tx.isVerboseLoggingEnabled() {
if keyRaw != nil {
tx.db.logf("db: LOOKUP %s/%v => %v", idx.FullName(), loggableVal(indexKeyVal), loggableRowVal(idx.table, row))
} else {
tx.db.logf("db: LOOKUP.NOTFOUND %s/%v", idx.FullName(), loggableVal(indexKeyVal))
}
}
return row, rowMeta
}
func (tx *Tx) lookupRawKeyByVal(idx *Index, indexKeyVal reflect.Value) []byte {
if at, et := indexKeyVal.Type(), idx.keyType(); at != et {
panic(fmt.Errorf("%s: attempted to index by incorrect type %v, expected %v", idx.FullName(), at, et))
}
indexKeyBuf := keyBytesPool.Get().([]byte)
defer releaseKeyBytes(indexKeyBuf)
tableBuck := nonNil(tx.btx.Bucket(idx.table.buck.Raw()))
idxBuck := nonNil(tableBuck.Bucket(idx.buck.Raw()))
fe := flatEncoder{buf: indexKeyBuf}
idx.keyEnc.encodeInto(&fe, indexKeyVal)
if idx.isUnique {
indexKeyRaw := fe.finalize()
indexVal := idxBuck.Get(indexKeyRaw)
if indexVal == nil {
return nil
}
return decodeUniqueIndexTableKey(indexKeyRaw, indexVal, idx)
} else {
scanPrefix, scanPrefixEls := fe.buf, fe.count()
c := idxBuck.Cursor()
for k, _ := c.Seek(scanPrefix); k != nil; k, _ = c.Next() {
if !bytes.HasPrefix(k, scanPrefix) {
break
}
indexKeyTup := decodeIndexKey(k, idx)
if len(indexKeyTup) != scanPrefixEls+1 {
panic(fmt.Errorf("%s: invalid index key %x: got %d els, wanted %d", idx.FullName(), k, len(indexKeyTup), scanPrefixEls+1))
}
actualPrefix := indexKeyTup.rawData(k, scanPrefixEls)
if !bytes.Equal(actualPrefix, scanPrefix) {
continue
}
dk, _ := extractUniqueIndexKey(indexKeyTup)
return dk
}
return nil
}
}