func (udc *UpsideDownCouch) dumpPrefix(kvreader store.KVReader, rv chan interface{}, prefix []byte) {
start := prefix
if start == nil {
start = []byte{0}
}
it := kvreader.Iterator(start)
defer func() {
cerr := it.Close()
if cerr != nil {
rv <- cerr
}
}()
key, val, valid := it.Current()
for valid {
if prefix != nil && !bytes.HasPrefix(key, prefix) {
break
}
row, err := ParseFromKeyValue(key, val)
if err != nil {
rv <- err
return
}
rv <- row
it.Next()
key, val, valid = it.Current()
}
}
func (udc *UpsideDownCouch) loadSchema(kvreader store.KVReader) (err error) {
keyPrefix := []byte{'f'}
it := kvreader.Iterator(keyPrefix)
defer func() {
if cerr := it.Close(); err == nil && cerr != nil {
err = cerr
}
}()
it.Seek(keyPrefix)
key, val, valid := it.Current()
for valid {
// stop when
if !bytes.HasPrefix(key, keyPrefix) {
break
}
var fieldRow *FieldRow
fieldRow, err = NewFieldRowKV(key, val)
if err != nil {
return
}
udc.fieldIndexCache.AddExisting(fieldRow.name, fieldRow.index)
it.Next()
key, val, valid = it.Current()
}
keyPrefix = []byte{'v'}
val, err = kvreader.Get(keyPrefix)
if err != nil {
return
}
var vr *VersionRow
vr, err = NewVersionRowKV(keyPrefix, val)
if err != nil {
return
}
if vr.version != Version {
err = IncompatibleVersion
return
}
return
}
func (udc *UpsideDownCouch) backIndexRowForDoc(kvreader store.KVReader, docID string) (*BackIndexRow, error) {
// use a temporary row structure to build key
tempRow := &BackIndexRow{
doc: []byte(docID),
}
key := tempRow.Key()
value, err := kvreader.Get(key)
if err != nil {
return nil, err
}
if value == nil {
return nil, nil
}
backIndexRow, err := NewBackIndexRowKV(key, value)
if err != nil {
return nil, err
}
return backIndexRow, nil
}
func (udc *UpsideDownCouch) countDocs(kvreader store.KVReader) (count uint64, err error) {
it := kvreader.Iterator([]byte{'b'})
defer func() {
if cerr := it.Close(); err == nil && cerr != nil {
err = cerr
}
}()
key, _, valid := it.Current()
for valid {
if !bytes.HasPrefix(key, []byte{'b'}) {
break
}
count++
it.Next()
key, _, valid = it.Current()
}
return
}