forked from blevesearch/bleve
/
dump.go
152 lines (127 loc) · 3.53 KB
/
dump.go
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// Copyright (c) 2014 Couchbase, Inc.
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
// except in compliance with the License. You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software distributed under the
// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
// either express or implied. See the License for the specific language governing permissions
// and limitations under the License.
package upside_down
import (
"bytes"
"sort"
"github.com/blevesearch/bleve/index/store"
)
// the functions in this file are only intended to be used by
// the bleve_dump utility and the debug http handlers
// if your application relies on them, you're doing something wrong
// they may change or be removed at any time
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 it.Close()
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) DumpAll() chan interface{} {
rv := make(chan interface{})
go func() {
defer close(rv)
// start an isolated reader for use during the dump
kvreader, err := udc.store.Reader()
if err != nil {
rv <- err
return
}
defer kvreader.Close()
udc.dumpPrefix(kvreader, rv, nil)
}()
return rv
}
func (udc *UpsideDownCouch) DumpFields() chan interface{} {
rv := make(chan interface{})
go func() {
defer close(rv)
// start an isolated reader for use during the dump
kvreader, err := udc.store.Reader()
if err != nil {
rv <- err
return
}
defer kvreader.Close()
udc.dumpPrefix(kvreader, rv, []byte{'f'})
}()
return rv
}
type keyset [][]byte
func (k keyset) Len() int { return len(k) }
func (k keyset) Swap(i, j int) { k[i], k[j] = k[j], k[i] }
func (k keyset) Less(i, j int) bool { return bytes.Compare(k[i], k[j]) < 0 }
// DumpDoc returns all rows in the index related to this doc id
func (udc *UpsideDownCouch) DumpDoc(id string) chan interface{} {
rv := make(chan interface{})
go func() {
defer close(rv)
// start an isolated reader for use during the dump
kvreader, err := udc.store.Reader()
if err != nil {
rv <- err
return
}
defer kvreader.Close()
back, err := udc.backIndexRowForDoc(kvreader, id)
if err != nil {
rv <- err
return
}
// no such doc
if back == nil {
return
}
// build sorted list of term keys
keys := make(keyset, 0)
for _, entry := range back.termEntries {
tfr := NewTermFrequencyRow([]byte(*entry.Term), uint16(*entry.Field), id, 0, 0)
key := tfr.Key()
keys = append(keys, key)
}
sort.Sort(keys)
// first add all the stored rows
storedRowPrefix := NewStoredRow(id, 0, []uint64{}, 'x', []byte{}).ScanPrefixForDoc()
udc.dumpPrefix(kvreader, rv, storedRowPrefix)
// now walk term keys in order and add them as well
if len(keys) > 0 {
it := kvreader.Iterator(keys[0])
defer it.Close()
for _, key := range keys {
it.Seek(key)
rkey, rval, valid := it.Current()
if !valid {
break
}
row, err := ParseFromKeyValue(rkey, rval)
if err != nil {
rv <- err
return
}
rv <- row
}
}
}()
return rv
}