forked from Gitlink/gitea-1120-rc1
147 lines
3.7 KiB
Go
147 lines
3.7 KiB
Go
package rupture
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import (
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"fmt"
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"hash/fnv"
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"path/filepath"
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"strconv"
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"github.com/blevesearch/bleve"
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"github.com/blevesearch/bleve/document"
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"github.com/blevesearch/bleve/mapping"
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)
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// ShardedIndex an index that is built onto of multiple underlying bleve
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// indices (i.e. shards). Similar to bleve's index aliases, some methods may
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// not be supported.
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type ShardedIndex interface {
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bleve.Index
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shards() []bleve.Index
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}
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// a type alias for bleve.Index, so that the anonymous field of
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// shardedIndex does not conflict with the Index(..) method.
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type bleveIndex bleve.Index
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type shardedIndex struct {
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bleveIndex
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indices []bleve.Index
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}
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func hash(id string, n int) uint64 {
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fnvHash := fnv.New64()
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fnvHash.Write([]byte(id))
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return fnvHash.Sum64() % uint64(n)
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}
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func childIndexerPath(rootPath string, i int) string {
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return filepath.Join(rootPath, strconv.Itoa(i))
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}
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// NewShardedIndex creates a sharded index at the specified path, with the
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// specified mapping and number of shards.
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func NewShardedIndex(path string, mapping mapping.IndexMapping, numShards int) (ShardedIndex, error) {
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if numShards <= 0 {
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return nil, fmt.Errorf("Invalid number of shards: %d", numShards)
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}
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err := writeJSON(shardedIndexMetadataPath(path), &shardedIndexMetadata{NumShards: numShards})
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if err != nil {
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return nil, err
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}
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s := &shardedIndex{
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indices: make([]bleve.Index, numShards),
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}
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for i := 0; i < numShards; i++ {
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s.indices[i], err = bleve.New(childIndexerPath(path, i), mapping)
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if err != nil {
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return nil, err
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}
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}
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s.bleveIndex = bleve.NewIndexAlias(s.indices...)
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return s, nil
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}
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// OpenShardedIndex opens a sharded index at the specified path.
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func OpenShardedIndex(path string) (ShardedIndex, error) {
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var meta shardedIndexMetadata
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var err error
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if err = readJSON(shardedIndexMetadataPath(path), &meta); err != nil {
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return nil, err
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}
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s := &shardedIndex{
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indices: make([]bleve.Index, meta.NumShards),
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}
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for i := 0; i < meta.NumShards; i++ {
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s.indices[i], err = bleve.Open(childIndexerPath(path, i))
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if err != nil {
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return nil, err
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}
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}
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s.bleveIndex = bleve.NewIndexAlias(s.indices...)
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return s, nil
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}
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func (s *shardedIndex) Index(id string, data interface{}) error {
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return s.indices[hash(id, len(s.indices))].Index(id, data)
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}
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func (s *shardedIndex) Delete(id string) error {
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return s.indices[hash(id, len(s.indices))].Delete(id)
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}
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func (s *shardedIndex) Document(id string) (*document.Document, error) {
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return s.indices[hash(id, len(s.indices))].Document(id)
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}
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func (s *shardedIndex) Close() error {
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if err := s.bleveIndex.Close(); err != nil {
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return err
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}
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for _, index := range s.indices {
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if err := index.Close(); err != nil {
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return err
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}
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}
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return nil
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}
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func (s *shardedIndex) shards() []bleve.Index {
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return s.indices
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}
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type shardedIndexFlushingBatch struct {
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batches []*singleIndexFlushingBatch
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}
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// NewShardedFlushingBatch creates a flushing batch with the specified batch
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// size for the specified sharded index.
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func NewShardedFlushingBatch(index ShardedIndex, maxBatchSize int) FlushingBatch {
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indices := index.shards()
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b := &shardedIndexFlushingBatch{
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batches: make([]*singleIndexFlushingBatch, len(indices)),
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}
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for i, index := range indices {
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b.batches[i] = newFlushingBatch(index, maxBatchSize)
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}
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return b
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}
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func (b *shardedIndexFlushingBatch) Index(id string, data interface{}) error {
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return b.batches[hash(id, len(b.batches))].Index(id, data)
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}
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func (b *shardedIndexFlushingBatch) Delete(id string) error {
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return b.batches[hash(id, len(b.batches))].Delete(id)
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}
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func (b *shardedIndexFlushingBatch) Flush() error {
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for _, batch := range b.batches {
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if err := batch.Flush(); err != nil {
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return err
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}
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}
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return nil
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}
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