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398 lines
9.9 KiB
398 lines
9.9 KiB
package kv
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import (
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"bytes"
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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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"time"
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"github.com/pkg/errors"
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cmn "github.com/tendermint/tmlibs/common"
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dbm "github.com/tendermint/tmlibs/db"
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"github.com/tendermint/tmlibs/pubsub/query"
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"github.com/tendermint/tendermint/state/txindex"
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"github.com/tendermint/tendermint/types"
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)
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const (
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tagKeySeparator = "/"
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)
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var _ txindex.TxIndexer = (*TxIndex)(nil)
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// TxIndex is the simplest possible indexer, backed by key-value storage (levelDB).
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type TxIndex struct {
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store dbm.DB
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tagsToIndex []string
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indexAllTags bool
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}
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// NewTxIndex creates new KV indexer.
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func NewTxIndex(store dbm.DB, options ...func(*TxIndex)) *TxIndex {
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txi := &TxIndex{store: store, tagsToIndex: make([]string, 0), indexAllTags: false}
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for _, o := range options {
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o(txi)
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}
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return txi
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}
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// IndexTags is an option for setting which tags to index.
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func IndexTags(tags []string) func(*TxIndex) {
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return func(txi *TxIndex) {
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txi.tagsToIndex = tags
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}
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}
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// IndexAllTags is an option for indexing all tags.
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func IndexAllTags() func(*TxIndex) {
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return func(txi *TxIndex) {
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txi.indexAllTags = true
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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) (*types.TxResult, error) {
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if len(hash) == 0 {
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return nil, txindex.ErrorEmptyHash
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}
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rawBytes := txi.store.Get(hash)
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if rawBytes == nil {
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return nil, nil
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}
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txResult := new(types.TxResult)
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err := cdc.UnmarshalBinaryBare(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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// AddBatch indexes a batch of transactions using the given list of tags.
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func (txi *TxIndex) AddBatch(b *txindex.Batch) error {
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storeBatch := txi.store.NewBatch()
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for _, result := range b.Ops {
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hash := result.Tx.Hash()
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// index tx by tags
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for _, tag := range result.Result.Tags {
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if txi.indexAllTags || cmn.StringInSlice(string(tag.Key), txi.tagsToIndex) {
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storeBatch.Set(keyForTag(tag, result), hash)
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}
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}
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// index tx by hash
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rawBytes, err := cdc.MarshalBinaryBare(result)
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if err != nil {
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return err
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}
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storeBatch.Set(hash, rawBytes)
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}
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storeBatch.Write()
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return nil
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}
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// Index indexes a single transaction using the given list of tags.
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func (txi *TxIndex) Index(result *types.TxResult) error {
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b := txi.store.NewBatch()
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hash := result.Tx.Hash()
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// index tx by tags
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for _, tag := range result.Result.Tags {
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if txi.indexAllTags || cmn.StringInSlice(string(tag.Key), txi.tagsToIndex) {
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b.Set(keyForTag(tag, result), hash)
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}
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}
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// index tx by hash
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rawBytes, err := cdc.MarshalBinaryBare(result)
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if err != nil {
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return err
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}
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b.Set(hash, rawBytes)
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b.Write()
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return nil
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}
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// Search performs a search using the given query. It breaks the query into
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// conditions (like "tx.height > 5"). For each condition, it queries the DB
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// index. One special use cases here: (1) if "tx.hash" is found, it returns tx
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// result for it (2) for range queries it is better for the client to provide
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// both lower and upper bounds, so we are not performing a full scan. Results
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// from querying indexes are then intersected and returned to the caller.
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func (txi *TxIndex) Search(q *query.Query) ([]*types.TxResult, error) {
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var hashes [][]byte
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var hashesInitialized bool
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// get a list of conditions (like "tx.height > 5")
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conditions := q.Conditions()
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// if there is a hash condition, return the result immediately
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hash, err, ok := lookForHash(conditions)
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if err != nil {
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return nil, errors.Wrap(err, "error during searching for a hash in the query")
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} else if ok {
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res, err := txi.Get(hash)
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if res == nil {
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return []*types.TxResult{}, nil
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} else {
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return []*types.TxResult{res}, errors.Wrap(err, "error while retrieving the result")
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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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// if there is a height condition ("tx.height=3"), extract it for faster lookups
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height, heightIndex := lookForHeight(conditions)
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if heightIndex >= 0 {
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skipIndexes = append(skipIndexes, heightIndex)
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}
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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 := lookForRanges(conditions)
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if len(ranges) > 0 {
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skipIndexes = append(skipIndexes, rangeIndexes...)
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for _, r := range ranges {
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if !hashesInitialized {
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hashes = txi.matchRange(r, startKeyForRange(r, height))
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hashesInitialized = true
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} else {
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hashes = intersect(hashes, txi.matchRange(r, startKeyForRange(r, height)))
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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 cmn.IntInSlice(i, skipIndexes) {
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continue
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}
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if !hashesInitialized {
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hashes = txi.match(c, startKey(c, height))
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hashesInitialized = true
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} else {
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hashes = intersect(hashes, txi.match(c, startKey(c, height)))
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}
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}
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results := make([]*types.TxResult, len(hashes))
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i := 0
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for _, h := range hashes {
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results[i], err = txi.Get(h)
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if err != nil {
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return nil, errors.Wrapf(err, "failed to get Tx{%X}", h)
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}
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i++
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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, err error, ok bool) {
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for _, c := range conditions {
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if c.Tag == types.TxHashKey {
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decoded, err := hex.DecodeString(c.Operand.(string))
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return decoded, err, true
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}
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}
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return
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}
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func lookForHeight(conditions []query.Condition) (height int64, index int) {
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for i, c := range conditions {
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if c.Tag == types.TxHeightKey {
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return c.Operand.(int64), i
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}
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}
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return 0, -1
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}
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// special map to hold range conditions
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// Example: account.number => queryRange{lowerBound: 1, upperBound: 5}
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type queryRanges map[string]queryRange
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type queryRange struct {
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key string
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lowerBound interface{} // int || time.Time
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includeLowerBound bool
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upperBound interface{} // int || time.Time
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includeUpperBound bool
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}
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func lookForRanges(conditions []query.Condition) (ranges queryRanges, indexes []int) {
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ranges = make(queryRanges)
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for i, c := range conditions {
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if isRangeOperation(c.Op) {
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r, ok := ranges[c.Tag]
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if !ok {
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r = queryRange{key: c.Tag}
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}
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switch c.Op {
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case query.OpGreater:
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r.lowerBound = c.Operand
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case query.OpGreaterEqual:
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r.includeLowerBound = true
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r.lowerBound = c.Operand
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case query.OpLess:
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r.upperBound = c.Operand
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case query.OpLessEqual:
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r.includeUpperBound = true
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r.upperBound = c.Operand
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}
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ranges[c.Tag] = r
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indexes = append(indexes, i)
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}
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}
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return ranges, indexes
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}
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func isRangeOperation(op query.Operator) bool {
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switch op {
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case query.OpGreater, query.OpGreaterEqual, query.OpLess, query.OpLessEqual:
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return true
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default:
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return false
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}
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}
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func (txi *TxIndex) match(c query.Condition, startKey []byte) (hashes [][]byte) {
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if c.Op == query.OpEqual {
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it := dbm.IteratePrefix(txi.store, startKey)
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defer it.Close()
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for ; it.Valid(); it.Next() {
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hashes = append(hashes, it.Value())
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}
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} else if c.Op == query.OpContains {
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// XXX: doing full scan because startKey does not apply here
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// For example, if startKey = "account.owner=an" and search query = "accoutn.owner CONSISTS 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 := txi.store.Iterator(nil, nil)
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defer it.Close()
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for ; it.Valid(); it.Next() {
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if !isTagKey(it.Key()) {
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continue
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}
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if strings.Contains(extractValueFromKey(it.Key()), c.Operand.(string)) {
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hashes = append(hashes, it.Value())
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}
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}
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} else {
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panic("other operators should be handled already")
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}
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return
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}
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func (txi *TxIndex) matchRange(r queryRange, startKey []byte) (hashes [][]byte) {
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it := dbm.IteratePrefix(txi.store, startKey)
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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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if !isTagKey(it.Key()) {
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continue
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}
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if r.upperBound != nil {
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// no other way to stop iterator other than checking for upperBound
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switch (r.upperBound).(type) {
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case int64:
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v, err := strconv.ParseInt(extractValueFromKey(it.Key()), 10, 64)
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if err == nil && v == r.upperBound {
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if r.includeUpperBound {
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hashes = append(hashes, it.Value())
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}
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break LOOP
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}
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// XXX: passing time in a ABCI Tags 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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}
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hashes = append(hashes, it.Value())
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}
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return
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}
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///////////////////////////////////////////////////////////////////////////////
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// Keys
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func startKey(c query.Condition, height int64) []byte {
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var key string
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if height > 0 {
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key = fmt.Sprintf("%s/%v/%d", c.Tag, c.Operand, height)
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} else {
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key = fmt.Sprintf("%s/%v", c.Tag, c.Operand)
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}
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return []byte(key)
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}
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func startKeyForRange(r queryRange, height int64) []byte {
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if r.lowerBound == nil {
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return []byte(r.key)
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}
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var lowerBound interface{}
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if r.includeLowerBound {
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lowerBound = r.lowerBound
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} else {
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switch t := r.lowerBound.(type) {
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case int64:
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lowerBound = t + 1
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case time.Time:
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lowerBound = t.Unix() + 1
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default:
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panic("not implemented")
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}
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}
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var key string
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if height > 0 {
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key = fmt.Sprintf("%s/%v/%d", r.key, lowerBound, height)
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} else {
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key = fmt.Sprintf("%s/%v", r.key, lowerBound)
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}
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return []byte(key)
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}
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func isTagKey(key []byte) bool {
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return strings.Count(string(key), tagKeySeparator) == 3
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}
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func extractValueFromKey(key []byte) string {
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parts := strings.SplitN(string(key), tagKeySeparator, 3)
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return parts[1]
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}
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func keyForTag(tag cmn.KVPair, result *types.TxResult) []byte {
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return []byte(fmt.Sprintf("%s/%s/%d/%d", tag.Key, tag.Value, result.Height, result.Index))
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}
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///////////////////////////////////////////////////////////////////////////////
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// Utils
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func intersect(as, bs [][]byte) [][]byte {
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i := make([][]byte, 0, cmn.MinInt(len(as), len(bs)))
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for _, a := range as {
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for _, b := range bs {
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if bytes.Equal(a, b) {
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i = append(i, a)
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}
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}
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}
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return i
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}
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