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490 lines
12 KiB
490 lines
12 KiB
package kv
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import (
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"context"
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"errors"
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"fmt"
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"sort"
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"strconv"
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"strings"
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"github.com/google/orderedcode"
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dbm "github.com/tendermint/tm-db"
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abci "github.com/tendermint/tendermint/abci/types"
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"github.com/tendermint/tendermint/libs/pubsub/query"
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"github.com/tendermint/tendermint/state/indexer"
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"github.com/tendermint/tendermint/types"
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)
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var _ indexer.BlockIndexer = (*BlockerIndexer)(nil)
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// BlockerIndexer implements a block indexer, indexing BeginBlock and EndBlock
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// events with an underlying KV store. Block events are indexed by their height,
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// such that matching search criteria returns the respective block height(s).
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type BlockerIndexer struct {
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store dbm.DB
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}
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func New(store dbm.DB) *BlockerIndexer {
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return &BlockerIndexer{
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store: store,
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}
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}
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// Has returns true if the given height has been indexed. An error is returned
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// upon database query failure.
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func (idx *BlockerIndexer) Has(height int64) (bool, error) {
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key, err := heightKey(height)
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if err != nil {
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return false, fmt.Errorf("failed to create block height index key: %w", err)
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}
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return idx.store.Has(key)
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}
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// Index indexes BeginBlock and EndBlock events for a given block by its height.
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// The following is indexed:
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//
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// primary key: encode(block.height | height) => encode(height)
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// BeginBlock events: encode(eventType.eventAttr|eventValue|height|begin_block) => encode(height)
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// EndBlock events: encode(eventType.eventAttr|eventValue|height|end_block) => encode(height)
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func (idx *BlockerIndexer) Index(bh types.EventDataNewBlockHeader) error {
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batch := idx.store.NewBatch()
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defer batch.Close()
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height := bh.Header.Height
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// 1. index by height
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key, err := heightKey(height)
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if err != nil {
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return fmt.Errorf("failed to create block height index key: %w", err)
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}
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if err := batch.Set(key, int64ToBytes(height)); err != nil {
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return err
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}
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// 2. index BeginBlock events
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if err := idx.indexEvents(batch, bh.ResultBeginBlock.Events, "begin_block", height); err != nil {
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return fmt.Errorf("failed to index BeginBlock events: %w", err)
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}
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// 3. index EndBlock events
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if err := idx.indexEvents(batch, bh.ResultEndBlock.Events, "end_block", height); err != nil {
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return fmt.Errorf("failed to index EndBlock events: %w", err)
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}
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return batch.WriteSync()
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}
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// Search performs a query for block heights that match a given BeginBlock
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// and Endblock event search criteria. The given query can match against zero,
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// one or more block heights. In the case of height queries, i.e. block.height=H,
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// if the height is indexed, that height alone will be returned. An error and
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// nil slice is returned. Otherwise, a non-nil slice and nil error is returned.
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func (idx *BlockerIndexer) Search(ctx context.Context, q *query.Query) ([]int64, error) {
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results := make([]int64, 0)
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select {
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case <-ctx.Done():
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return results, nil
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default:
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}
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conditions, err := q.Conditions()
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if err != nil {
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return nil, fmt.Errorf("failed to parse query conditions: %w", err)
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}
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// If there is an exact height query, return the result immediately
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// (if it exists).
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height, ok := lookForHeight(conditions)
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if ok {
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ok, err := idx.Has(height)
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if err != nil {
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return nil, err
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}
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if ok {
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return []int64{height}, nil
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}
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return results, nil
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}
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var heightsInitialized bool
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filteredHeights := make(map[string][]byte)
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// conditions to skip because they're handled before "everything else"
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skipIndexes := make([]int, 0)
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// Extract ranges. If both upper and lower bounds exist, it's better to get
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// them in order as to not iterate over kvs that are not within range.
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ranges, rangeIndexes := indexer.LookForRanges(conditions)
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if len(ranges) > 0 {
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skipIndexes = append(skipIndexes, rangeIndexes...)
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for _, qr := range ranges {
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prefix, err := orderedcode.Append(nil, qr.Key)
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if err != nil {
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return nil, fmt.Errorf("failed to create prefix key: %w", err)
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}
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if !heightsInitialized {
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filteredHeights, err = idx.matchRange(ctx, qr, prefix, filteredHeights, true)
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if err != nil {
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return nil, err
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}
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heightsInitialized = true
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// Ignore any remaining conditions if the first condition resulted in no
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// matches (assuming implicit AND operand).
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if len(filteredHeights) == 0 {
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break
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}
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} else {
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filteredHeights, err = idx.matchRange(ctx, qr, prefix, filteredHeights, false)
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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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}
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}
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// for all other conditions
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for i, c := range conditions {
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if intInSlice(i, skipIndexes) {
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continue
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}
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startKey, err := orderedcode.Append(nil, c.CompositeKey, fmt.Sprintf("%v", c.Operand))
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if err != nil {
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return nil, err
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}
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if !heightsInitialized {
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filteredHeights, err = idx.match(ctx, c, startKey, filteredHeights, true)
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if err != nil {
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return nil, err
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}
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heightsInitialized = true
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// Ignore any remaining conditions if the first condition resulted in no
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// matches (assuming implicit AND operand).
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if len(filteredHeights) == 0 {
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break
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}
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} else {
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filteredHeights, err = idx.match(ctx, c, startKey, filteredHeights, false)
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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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}
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// fetch matching heights
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results = make([]int64, 0, len(filteredHeights))
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for _, hBz := range filteredHeights {
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h := int64FromBytes(hBz)
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ok, err := idx.Has(h)
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if err != nil {
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return nil, err
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}
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if ok {
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results = append(results, h)
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}
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select {
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case <-ctx.Done():
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break
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default:
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}
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}
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sort.Slice(results, func(i, j int) bool { return results[i] < results[j] })
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return results, nil
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}
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// matchRange returns all matching block heights that match a given QueryRange
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// and start key. An already filtered result (filteredHeights) is provided such
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// that any non-intersecting matches are removed.
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//
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// NOTE: The provided filteredHeights may be empty if no previous condition has
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// matched.
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func (idx *BlockerIndexer) matchRange(
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ctx context.Context,
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qr indexer.QueryRange,
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startKey []byte,
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filteredHeights map[string][]byte,
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firstRun bool,
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) (map[string][]byte, error) {
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// A previous match was attempted but resulted in no matches, so we return
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// no matches (assuming AND operand).
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if !firstRun && len(filteredHeights) == 0 {
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return filteredHeights, nil
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}
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tmpHeights := make(map[string][]byte)
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lowerBound := qr.LowerBoundValue()
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upperBound := qr.UpperBoundValue()
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it, err := dbm.IteratePrefix(idx.store, startKey)
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if err != nil {
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return nil, fmt.Errorf("failed to create prefix iterator: %w", err)
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}
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defer it.Close()
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LOOP:
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for ; it.Valid(); it.Next() {
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var (
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eventValue string
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err error
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)
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if qr.Key == types.BlockHeightKey {
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eventValue, err = parseValueFromPrimaryKey(it.Key())
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} else {
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eventValue, err = parseValueFromEventKey(it.Key())
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}
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if err != nil {
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continue
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}
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if _, ok := qr.AnyBound().(int64); ok {
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v, err := strconv.ParseInt(eventValue, 10, 64)
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if err != nil {
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continue LOOP
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}
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include := true
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if lowerBound != nil && v < lowerBound.(int64) {
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include = false
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}
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if upperBound != nil && v > upperBound.(int64) {
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include = false
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}
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if include {
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tmpHeights[string(it.Value())] = it.Value()
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}
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}
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select {
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case <-ctx.Done():
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break
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default:
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}
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}
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if err := it.Error(); err != nil {
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return nil, err
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}
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if len(tmpHeights) == 0 || firstRun {
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// Either:
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//
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// 1. Regardless if a previous match was attempted, which may have had
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// results, but no match was found for the current condition, then we
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// return no matches (assuming AND operand).
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//
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// 2. A previous match was not attempted, so we return all results.
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return tmpHeights, nil
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}
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// Remove/reduce matches in filteredHashes that were not found in this
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// match (tmpHashes).
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for k := range filteredHeights {
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if tmpHeights[k] == nil {
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delete(filteredHeights, k)
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select {
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case <-ctx.Done():
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break
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default:
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}
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}
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}
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return filteredHeights, nil
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}
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// match returns all matching heights that meet a given query condition and start
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// key. An already filtered result (filteredHeights) is provided such that any
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// non-intersecting matches are removed.
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//
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// NOTE: The provided filteredHeights may be empty if no previous condition has
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// matched.
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func (idx *BlockerIndexer) match(
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ctx context.Context,
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c query.Condition,
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startKeyBz []byte,
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filteredHeights map[string][]byte,
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firstRun bool,
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) (map[string][]byte, error) {
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// A previous match was attempted but resulted in no matches, so we return
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// no matches (assuming AND operand).
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if !firstRun && len(filteredHeights) == 0 {
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return filteredHeights, nil
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}
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tmpHeights := make(map[string][]byte)
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switch {
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case c.Op == query.OpEqual:
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it, err := dbm.IteratePrefix(idx.store, startKeyBz)
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if err != nil {
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return nil, fmt.Errorf("failed to create prefix iterator: %w", err)
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}
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defer it.Close()
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for ; it.Valid(); it.Next() {
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tmpHeights[string(it.Value())] = it.Value()
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if err := ctx.Err(); err != nil {
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break
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}
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}
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if err := it.Error(); err != nil {
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return nil, err
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}
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case c.Op == query.OpExists:
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prefix, err := orderedcode.Append(nil, c.CompositeKey)
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if err != nil {
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return nil, err
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}
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it, err := dbm.IteratePrefix(idx.store, prefix)
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if err != nil {
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return nil, fmt.Errorf("failed to create prefix iterator: %w", err)
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}
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defer it.Close()
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for ; it.Valid(); it.Next() {
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tmpHeights[string(it.Value())] = it.Value()
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select {
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case <-ctx.Done():
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break
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default:
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}
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}
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if err := it.Error(); err != nil {
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return nil, err
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}
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case c.Op == query.OpContains:
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prefix, err := orderedcode.Append(nil, c.CompositeKey)
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if err != nil {
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return nil, err
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}
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it, err := dbm.IteratePrefix(idx.store, prefix)
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if err != nil {
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return nil, fmt.Errorf("failed to create prefix iterator: %w", err)
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}
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defer it.Close()
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for ; it.Valid(); it.Next() {
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eventValue, err := parseValueFromEventKey(it.Key())
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if err != nil {
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continue
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}
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if strings.Contains(eventValue, c.Operand.(string)) {
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tmpHeights[string(it.Value())] = it.Value()
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}
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select {
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case <-ctx.Done():
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break
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default:
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}
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}
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if err := it.Error(); err != nil {
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return nil, err
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}
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default:
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return nil, errors.New("other operators should be handled already")
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}
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if len(tmpHeights) == 0 || firstRun {
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// Either:
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//
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// 1. Regardless if a previous match was attempted, which may have had
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// results, but no match was found for the current condition, then we
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// return no matches (assuming AND operand).
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//
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// 2. A previous match was not attempted, so we return all results.
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return tmpHeights, nil
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}
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// Remove/reduce matches in filteredHeights that were not found in this
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// match (tmpHeights).
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for k := range filteredHeights {
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if tmpHeights[k] == nil {
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delete(filteredHeights, k)
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select {
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case <-ctx.Done():
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break
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default:
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}
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}
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}
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return filteredHeights, nil
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}
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func (idx *BlockerIndexer) indexEvents(batch dbm.Batch, events []abci.Event, typ string, height int64) error {
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heightBz := int64ToBytes(height)
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for _, event := range events {
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// only index events with a non-empty type
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if len(event.Type) == 0 {
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continue
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}
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for _, attr := range event.Attributes {
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if len(attr.Key) == 0 {
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continue
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}
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// index iff the event specified index:true and it's not a reserved event
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compositeKey := fmt.Sprintf("%s.%s", event.Type, string(attr.Key))
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if compositeKey == types.BlockHeightKey {
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return fmt.Errorf("event type and attribute key \"%s\" is reserved; please use a different key", compositeKey)
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}
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if attr.GetIndex() {
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key, err := eventKey(compositeKey, typ, string(attr.Value), height)
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if err != nil {
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return fmt.Errorf("failed to create block index key: %w", err)
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}
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if err := batch.Set(key, heightBz); err != nil {
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return err
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}
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}
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}
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}
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return nil
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}
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