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586 lines
15 KiB
586 lines
15 KiB
package kv
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import (
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"context"
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"encoding/hex"
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"fmt"
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"strconv"
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"strings"
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"github.com/gogo/protobuf/proto"
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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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indexer "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.TxIndexer = (*TxIndex)(nil)
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// TxIndex is the simplest possible indexer
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// It is backed by two kv stores:
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// 1. txhash - result (primary key)
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// 2. event - txhash (secondary key)
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type TxIndex struct {
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store dbm.DB
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}
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// NewTxIndex creates new KV indexer.
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func NewTxIndex(store dbm.DB) *TxIndex {
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return &TxIndex{
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store: store,
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}
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}
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// Get gets transaction from the TxIndex storage and returns it or nil if the
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// transaction is not found.
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func (txi *TxIndex) Get(hash []byte) (*abci.TxResult, error) {
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if len(hash) == 0 {
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return nil, indexer.ErrorEmptyHash
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}
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rawBytes, err := txi.store.Get(primaryKey(hash))
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if err != nil {
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panic(err)
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}
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if rawBytes == nil {
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return nil, nil
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}
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txResult := new(abci.TxResult)
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err = proto.Unmarshal(rawBytes, txResult)
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if err != nil {
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return nil, fmt.Errorf("error reading TxResult: %v", err)
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}
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return txResult, nil
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}
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// Index indexes transactions using the given list of events. Each key
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// that indexed from the tx's events is a composite of the event type and the
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// respective attribute's key delimited by a "." (eg. "account.number").
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// Any event with an empty type is not indexed.
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func (txi *TxIndex) Index(results []*abci.TxResult) error {
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b := txi.store.NewBatch()
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defer b.Close()
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for _, result := range results {
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hash := types.Tx(result.Tx).Hash()
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// index tx by events
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err := txi.indexEvents(result, hash, b)
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if err != nil {
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return err
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}
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// index by height (always)
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err = b.Set(KeyFromHeight(result), hash)
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if err != nil {
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return err
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}
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rawBytes, err := proto.Marshal(result)
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if err != nil {
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return err
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}
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// index by hash (always)
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err = b.Set(primaryKey(hash), rawBytes)
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if err != nil {
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return err
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}
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}
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return b.WriteSync()
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}
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func (txi *TxIndex) indexEvents(result *abci.TxResult, hash []byte, store dbm.Batch) error {
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for _, event := range result.Result.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 if `index: true` is set
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compositeTag := fmt.Sprintf("%s.%s", event.Type, attr.Key)
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// ensure event does not conflict with a reserved prefix key
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if compositeTag == types.TxHashKey || compositeTag == types.TxHeightKey {
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return fmt.Errorf("event type and attribute key \"%s\" is reserved; please use a different key", compositeTag)
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}
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if attr.GetIndex() {
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err := store.Set(keyFromEvent(compositeTag, attr.Value, result), hash)
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if 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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// Search performs a search using the given query.
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//
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// It breaks the query into conditions (like "tx.height > 5"). For each
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// condition, it queries the DB index. One special use cases here: (1) if
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// "tx.hash" is found, it returns tx result for it (2) for range queries it is
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// better for the client to provide both lower and upper bounds, so we are not
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// performing a full scan. Results from querying indexes are then intersected
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// and returned to the caller, in no particular order.
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//
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// Search will exit early and return any result fetched so far,
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// when a message is received on the context chan.
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func (txi *TxIndex) Search(ctx context.Context, q *query.Query) ([]*abci.TxResult, error) {
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select {
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case <-ctx.Done():
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return make([]*abci.TxResult, 0), nil
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default:
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}
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var hashesInitialized bool
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filteredHashes := make(map[string][]byte)
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// get a list of conditions (like "tx.height > 5")
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conditions, err := q.Conditions()
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if err != nil {
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return nil, fmt.Errorf("error during parsing conditions from query: %w", err)
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}
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// if there is a hash condition, return the result immediately
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hash, ok, err := lookForHash(conditions)
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if err != nil {
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return nil, fmt.Errorf("error during searching for a hash in the query: %w", err)
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} else if ok {
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res, err := txi.Get(hash)
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switch {
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case err != nil:
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return []*abci.TxResult{}, fmt.Errorf("error while retrieving the result: %w", err)
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case res == nil:
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return []*abci.TxResult{}, nil
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default:
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return []*abci.TxResult{res}, nil
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}
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}
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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
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// if both upper and lower bounds exist, it's better to get them in order not
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// no 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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if !hashesInitialized {
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filteredHashes = txi.matchRange(ctx, qr, prefixFromCompositeKey(qr.Key), filteredHashes, true)
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hashesInitialized = true
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// Ignore any remaining conditions if the first condition resulted
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// in no matches (assuming implicit AND operand).
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if len(filteredHashes) == 0 {
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break
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}
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} else {
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filteredHashes = txi.matchRange(ctx, qr, prefixFromCompositeKey(qr.Key), filteredHashes, false)
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}
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}
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}
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// if there is a height condition ("tx.height=3"), extract it
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height := lookForHeight(conditions)
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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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if !hashesInitialized {
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filteredHashes = txi.match(ctx, c, prefixForCondition(c, height), filteredHashes, true)
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hashesInitialized = true
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// Ignore any remaining conditions if the first condition resulted
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// in no matches (assuming implicit AND operand).
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if len(filteredHashes) == 0 {
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break
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}
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} else {
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filteredHashes = txi.match(ctx, c, prefixForCondition(c, height), filteredHashes, false)
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}
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}
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results := make([]*abci.TxResult, 0, len(filteredHashes))
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for _, h := range filteredHashes {
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res, err := txi.Get(h)
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if err != nil {
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return nil, fmt.Errorf("failed to get Tx{%X}: %w", h, err)
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}
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results = append(results, res)
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// Potentially exit early.
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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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return results, nil
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}
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func lookForHash(conditions []query.Condition) (hash []byte, ok bool, err error) {
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for _, c := range conditions {
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if c.CompositeKey == types.TxHashKey {
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decoded, err := hex.DecodeString(c.Operand.(string))
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return decoded, true, err
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}
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}
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return
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}
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// lookForHeight returns a height if there is an "height=X" condition.
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func lookForHeight(conditions []query.Condition) (height int64) {
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for _, c := range conditions {
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if c.CompositeKey == types.TxHeightKey && c.Op == query.OpEqual {
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return c.Operand.(int64)
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}
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}
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return 0
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}
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// match returns all matching txs by hash that meet a given condition and start
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// key. An already filtered result (filteredHashes) is provided such that any
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// non-intersecting matches are removed.
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//
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// NOTE: filteredHashes may be empty if no previous condition has matched.
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func (txi *TxIndex) 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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filteredHashes map[string][]byte,
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firstRun bool,
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) map[string][]byte {
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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(filteredHashes) == 0 {
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return filteredHashes
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}
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tmpHashes := 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(txi.store, startKeyBz)
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if err != nil {
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panic(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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tmpHashes[string(it.Value())] = it.Value()
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// Potentially exit early.
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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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panic(err)
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}
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case c.Op == query.OpExists:
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// XXX: can't use startKeyBz here because c.Operand is nil
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// (e.g. "account.owner/<nil>/" won't match w/ a single row)
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it, err := dbm.IteratePrefix(txi.store, prefixFromCompositeKey(c.CompositeKey))
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if err != nil {
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panic(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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tmpHashes[string(it.Value())] = it.Value()
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// Potentially exit early.
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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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panic(err)
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}
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case c.Op == query.OpContains:
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// XXX: startKey does not apply here.
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// For example, if startKey = "account.owner/an/" and search query = "account.owner CONTAINS an"
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// we can't iterate with prefix "account.owner/an/" because we might miss keys like "account.owner/Ulan/"
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it, err := dbm.IteratePrefix(txi.store, prefixFromCompositeKey(c.CompositeKey))
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if err != nil {
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panic(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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value, err := parseValueFromKey(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(value, c.Operand.(string)) {
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tmpHashes[string(it.Value())] = it.Value()
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}
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// Potentially exit early.
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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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panic(err)
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}
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default:
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panic("other operators should be handled already")
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}
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if len(tmpHashes) == 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 tmpHashes
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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 filteredHashes {
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if tmpHashes[k] == nil {
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delete(filteredHashes, k)
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// Potentially exit early.
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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 filteredHashes
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}
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// matchRange returns all matching txs by hash that meet a given queryRange and
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// start key. An already filtered result (filteredHashes) is provided such that
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// any non-intersecting matches are removed.
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//
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// NOTE: filteredHashes may be empty if no previous condition has matched.
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func (txi *TxIndex) 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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filteredHashes map[string][]byte,
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firstRun bool,
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) map[string][]byte {
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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(filteredHashes) == 0 {
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return filteredHashes
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}
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tmpHashes := 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(txi.store, startKey)
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if err != nil {
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panic(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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value, err := parseValueFromKey(it.Key())
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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(value, 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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tmpHashes[string(it.Value())] = it.Value()
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}
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// XXX: passing time in a ABCI Events is not yet implemented
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// case time.Time:
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// v := strconv.ParseInt(extractValueFromKey(it.Key()), 10, 64)
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// if v == r.upperBound {
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// break
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// }
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}
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// Potentially exit early.
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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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panic(err)
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}
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if len(tmpHashes) == 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 tmpHashes
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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 filteredHashes {
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if tmpHashes[k] == nil {
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delete(filteredHashes, k)
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// Potentially exit early.
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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 filteredHashes
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}
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// ########################## Keys #############################
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//
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// The indexer has two types of kv stores:
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// 1. txhash - result (primary key)
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// 2. event - txhash (secondary key)
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//
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// The event key can be decomposed into 4 parts.
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// 1. A composite key which can be any string.
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// Usually something like "tx.height" or "account.owner"
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// 2. A value. That corresponds to the key. In the above
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// example the value could be "5" or "Ivan"
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// 3. The height of the Tx that aligns with the key and value.
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// 4. The index of the Tx that aligns with the key and value
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// the hash/primary key
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func primaryKey(hash []byte) []byte {
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key, err := orderedcode.Append(
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nil,
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types.TxHashKey,
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string(hash),
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)
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if err != nil {
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panic(err)
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}
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return key
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}
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// The event/secondary key
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func secondaryKey(compositeKey, value string, height int64, index uint32) []byte {
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key, err := orderedcode.Append(
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nil,
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compositeKey,
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value,
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height,
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int64(index),
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)
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if err != nil {
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panic(err)
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}
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return key
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}
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// parseValueFromKey parses an event key and extracts out the value, returning an error if one arises.
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// This will also involve ensuring that the key has the correct format.
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// CONTRACT: function doesn't check that the prefix is correct. This should have already been done by the iterator
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func parseValueFromKey(key []byte) (string, error) {
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var (
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compositeKey, value string
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height, index int64
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)
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remaining, err := orderedcode.Parse(string(key), &compositeKey, &value, &height, &index)
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if err != nil {
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return "", err
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}
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if len(remaining) != 0 {
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return "", fmt.Errorf("unexpected remainder in key: %s", remaining)
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}
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return value, nil
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}
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func keyFromEvent(compositeKey string, value string, result *abci.TxResult) []byte {
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return secondaryKey(compositeKey, value, result.Height, result.Index)
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}
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func KeyFromHeight(result *abci.TxResult) []byte {
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return secondaryKey(types.TxHeightKey, fmt.Sprintf("%d", result.Height), result.Height, result.Index)
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}
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// Prefixes: these represent an initial part of the key and are used by iterators to iterate over a small
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// section of the kv store during searches.
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|
|
func prefixFromCompositeKey(compositeKey string) []byte {
|
|
key, err := orderedcode.Append(nil, compositeKey)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return key
|
|
}
|
|
|
|
func prefixFromCompositeKeyAndValue(compositeKey, value string) []byte {
|
|
key, err := orderedcode.Append(nil, compositeKey, value)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return key
|
|
}
|
|
|
|
// a small utility function for getting a keys prefix based on a condition and a height
|
|
func prefixForCondition(c query.Condition, height int64) []byte {
|
|
key := prefixFromCompositeKeyAndValue(c.CompositeKey, fmt.Sprintf("%v", c.Operand))
|
|
if height > 0 {
|
|
var err error
|
|
key, err = orderedcode.Append(key, height)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
}
|
|
return key
|
|
}
|