You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
452 lines
11 KiB
452 lines
11 KiB
package kv
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/hex"
|
|
"fmt"
|
|
"sort"
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/pkg/errors"
|
|
cmn "github.com/tendermint/tendermint/libs/common"
|
|
dbm "github.com/tendermint/tendermint/libs/db"
|
|
|
|
"github.com/tendermint/tendermint/libs/pubsub/query"
|
|
"github.com/tendermint/tendermint/state/txindex"
|
|
"github.com/tendermint/tendermint/types"
|
|
)
|
|
|
|
const (
|
|
tagKeySeparator = "/"
|
|
)
|
|
|
|
var _ txindex.TxIndexer = (*TxIndex)(nil)
|
|
|
|
// TxIndex is the simplest possible indexer, backed by key-value storage (levelDB).
|
|
type TxIndex struct {
|
|
store dbm.DB
|
|
tagsToIndex []string
|
|
indexAllTags bool
|
|
}
|
|
|
|
// NewTxIndex creates new KV indexer.
|
|
func NewTxIndex(store dbm.DB, options ...func(*TxIndex)) *TxIndex {
|
|
txi := &TxIndex{store: store, tagsToIndex: make([]string, 0), indexAllTags: false}
|
|
for _, o := range options {
|
|
o(txi)
|
|
}
|
|
return txi
|
|
}
|
|
|
|
// IndexTags is an option for setting which tags to index.
|
|
func IndexTags(tags []string) func(*TxIndex) {
|
|
return func(txi *TxIndex) {
|
|
txi.tagsToIndex = tags
|
|
}
|
|
}
|
|
|
|
// IndexAllTags is an option for indexing all tags.
|
|
func IndexAllTags() func(*TxIndex) {
|
|
return func(txi *TxIndex) {
|
|
txi.indexAllTags = true
|
|
}
|
|
}
|
|
|
|
// Get gets transaction from the TxIndex storage and returns it or nil if the
|
|
// transaction is not found.
|
|
func (txi *TxIndex) Get(hash []byte) (*types.TxResult, error) {
|
|
if len(hash) == 0 {
|
|
return nil, txindex.ErrorEmptyHash
|
|
}
|
|
|
|
rawBytes := txi.store.Get(hash)
|
|
if rawBytes == nil {
|
|
return nil, nil
|
|
}
|
|
|
|
txResult := new(types.TxResult)
|
|
err := cdc.UnmarshalBinaryBare(rawBytes, &txResult)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Error reading TxResult: %v", err)
|
|
}
|
|
|
|
return txResult, nil
|
|
}
|
|
|
|
// AddBatch indexes a batch of transactions using the given list of tags.
|
|
func (txi *TxIndex) AddBatch(b *txindex.Batch) error {
|
|
storeBatch := txi.store.NewBatch()
|
|
|
|
for _, result := range b.Ops {
|
|
hash := result.Tx.Hash()
|
|
|
|
// index tx by tags
|
|
for _, tag := range result.Result.Tags {
|
|
if txi.indexAllTags || cmn.StringInSlice(string(tag.Key), txi.tagsToIndex) {
|
|
storeBatch.Set(keyForTag(tag, result), hash)
|
|
}
|
|
}
|
|
|
|
// index tx by height
|
|
if txi.indexAllTags || cmn.StringInSlice(types.TxHeightKey, txi.tagsToIndex) {
|
|
storeBatch.Set(keyForHeight(result), hash)
|
|
}
|
|
|
|
// index tx by hash
|
|
rawBytes, err := cdc.MarshalBinaryBare(result)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
storeBatch.Set(hash, rawBytes)
|
|
}
|
|
|
|
storeBatch.Write()
|
|
return nil
|
|
}
|
|
|
|
// Index indexes a single transaction using the given list of tags.
|
|
func (txi *TxIndex) Index(result *types.TxResult) error {
|
|
b := txi.store.NewBatch()
|
|
|
|
hash := result.Tx.Hash()
|
|
|
|
// index tx by tags
|
|
for _, tag := range result.Result.Tags {
|
|
if txi.indexAllTags || cmn.StringInSlice(string(tag.Key), txi.tagsToIndex) {
|
|
b.Set(keyForTag(tag, result), hash)
|
|
}
|
|
}
|
|
|
|
// index tx by height
|
|
if txi.indexAllTags || cmn.StringInSlice(types.TxHeightKey, txi.tagsToIndex) {
|
|
b.Set(keyForHeight(result), hash)
|
|
}
|
|
|
|
// index tx by hash
|
|
rawBytes, err := cdc.MarshalBinaryBare(result)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
b.Set(hash, rawBytes)
|
|
|
|
b.Write()
|
|
return nil
|
|
}
|
|
|
|
// Search performs a search using the given query. It breaks the query into
|
|
// conditions (like "tx.height > 5"). For each condition, it queries the DB
|
|
// index. One special use cases here: (1) if "tx.hash" is found, it returns tx
|
|
// result for it (2) for range queries it is better for the client to provide
|
|
// both lower and upper bounds, so we are not performing a full scan. Results
|
|
// from querying indexes are then intersected and returned to the caller.
|
|
func (txi *TxIndex) Search(q *query.Query) ([]*types.TxResult, error) {
|
|
var hashes [][]byte
|
|
var hashesInitialized bool
|
|
|
|
// get a list of conditions (like "tx.height > 5")
|
|
conditions := q.Conditions()
|
|
|
|
// if there is a hash condition, return the result immediately
|
|
hash, err, ok := lookForHash(conditions)
|
|
if err != nil {
|
|
return nil, errors.Wrap(err, "error during searching for a hash in the query")
|
|
} else if ok {
|
|
res, err := txi.Get(hash)
|
|
if res == nil {
|
|
return []*types.TxResult{}, nil
|
|
}
|
|
return []*types.TxResult{res}, errors.Wrap(err, "error while retrieving the result")
|
|
}
|
|
|
|
// conditions to skip because they're handled before "everything else"
|
|
skipIndexes := make([]int, 0)
|
|
|
|
// extract ranges
|
|
// if both upper and lower bounds exist, it's better to get them in order not
|
|
// no iterate over kvs that are not within range.
|
|
ranges, rangeIndexes := lookForRanges(conditions)
|
|
if len(ranges) > 0 {
|
|
skipIndexes = append(skipIndexes, rangeIndexes...)
|
|
|
|
for _, r := range ranges {
|
|
if !hashesInitialized {
|
|
hashes = txi.matchRange(r, []byte(r.key))
|
|
hashesInitialized = true
|
|
} else {
|
|
hashes = intersect(hashes, txi.matchRange(r, []byte(r.key)))
|
|
}
|
|
}
|
|
}
|
|
|
|
// if there is a height condition ("tx.height=3"), extract it
|
|
height := lookForHeight(conditions)
|
|
|
|
// for all other conditions
|
|
for i, c := range conditions {
|
|
if cmn.IntInSlice(i, skipIndexes) {
|
|
continue
|
|
}
|
|
|
|
if !hashesInitialized {
|
|
hashes = txi.match(c, startKey(c, height))
|
|
hashesInitialized = true
|
|
} else {
|
|
hashes = intersect(hashes, txi.match(c, startKey(c, height)))
|
|
}
|
|
}
|
|
|
|
results := make([]*types.TxResult, len(hashes))
|
|
i := 0
|
|
for _, h := range hashes {
|
|
results[i], err = txi.Get(h)
|
|
if err != nil {
|
|
return nil, errors.Wrapf(err, "failed to get Tx{%X}", h)
|
|
}
|
|
i++
|
|
}
|
|
|
|
// sort by height & index by default
|
|
sort.Slice(results, func(i, j int) bool {
|
|
if results[i].Height == results[j].Height {
|
|
return results[i].Index < results[j].Index
|
|
}
|
|
return results[i].Height < results[j].Height
|
|
})
|
|
|
|
return results, nil
|
|
}
|
|
|
|
func lookForHash(conditions []query.Condition) (hash []byte, err error, ok bool) {
|
|
for _, c := range conditions {
|
|
if c.Tag == types.TxHashKey {
|
|
decoded, err := hex.DecodeString(c.Operand.(string))
|
|
return decoded, err, true
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
// lookForHeight returns a height if there is an "height=X" condition.
|
|
func lookForHeight(conditions []query.Condition) (height int64) {
|
|
for _, c := range conditions {
|
|
if c.Tag == types.TxHeightKey && c.Op == query.OpEqual {
|
|
return c.Operand.(int64)
|
|
}
|
|
}
|
|
return 0
|
|
}
|
|
|
|
// special map to hold range conditions
|
|
// Example: account.number => queryRange{lowerBound: 1, upperBound: 5}
|
|
type queryRanges map[string]queryRange
|
|
|
|
type queryRange struct {
|
|
key string
|
|
lowerBound interface{} // int || time.Time
|
|
includeLowerBound bool
|
|
upperBound interface{} // int || time.Time
|
|
includeUpperBound bool
|
|
}
|
|
|
|
func (r queryRange) lowerBoundValue() interface{} {
|
|
if r.lowerBound == nil {
|
|
return nil
|
|
}
|
|
|
|
if r.includeLowerBound {
|
|
return r.lowerBound
|
|
} else {
|
|
switch t := r.lowerBound.(type) {
|
|
case int64:
|
|
return t + 1
|
|
case time.Time:
|
|
return t.Unix() + 1
|
|
default:
|
|
panic("not implemented")
|
|
}
|
|
}
|
|
}
|
|
|
|
func (r queryRange) AnyBound() interface{} {
|
|
if r.lowerBound != nil {
|
|
return r.lowerBound
|
|
} else {
|
|
return r.upperBound
|
|
}
|
|
}
|
|
|
|
func (r queryRange) upperBoundValue() interface{} {
|
|
if r.upperBound == nil {
|
|
return nil
|
|
}
|
|
|
|
if r.includeUpperBound {
|
|
return r.upperBound
|
|
} else {
|
|
switch t := r.upperBound.(type) {
|
|
case int64:
|
|
return t - 1
|
|
case time.Time:
|
|
return t.Unix() - 1
|
|
default:
|
|
panic("not implemented")
|
|
}
|
|
}
|
|
}
|
|
|
|
func lookForRanges(conditions []query.Condition) (ranges queryRanges, indexes []int) {
|
|
ranges = make(queryRanges)
|
|
for i, c := range conditions {
|
|
if isRangeOperation(c.Op) {
|
|
r, ok := ranges[c.Tag]
|
|
if !ok {
|
|
r = queryRange{key: c.Tag}
|
|
}
|
|
switch c.Op {
|
|
case query.OpGreater:
|
|
r.lowerBound = c.Operand
|
|
case query.OpGreaterEqual:
|
|
r.includeLowerBound = true
|
|
r.lowerBound = c.Operand
|
|
case query.OpLess:
|
|
r.upperBound = c.Operand
|
|
case query.OpLessEqual:
|
|
r.includeUpperBound = true
|
|
r.upperBound = c.Operand
|
|
}
|
|
ranges[c.Tag] = r
|
|
indexes = append(indexes, i)
|
|
}
|
|
}
|
|
return ranges, indexes
|
|
}
|
|
|
|
func isRangeOperation(op query.Operator) bool {
|
|
switch op {
|
|
case query.OpGreater, query.OpGreaterEqual, query.OpLess, query.OpLessEqual:
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
func (txi *TxIndex) match(c query.Condition, startKey []byte) (hashes [][]byte) {
|
|
if c.Op == query.OpEqual {
|
|
it := dbm.IteratePrefix(txi.store, startKey)
|
|
defer it.Close()
|
|
for ; it.Valid(); it.Next() {
|
|
hashes = append(hashes, it.Value())
|
|
}
|
|
} else if c.Op == query.OpContains {
|
|
// XXX: doing full scan because startKey does not apply here
|
|
// For example, if startKey = "account.owner=an" and search query = "accoutn.owner CONSISTS an"
|
|
// we can't iterate with prefix "account.owner=an" because we might miss keys like "account.owner=Ulan"
|
|
it := txi.store.Iterator(nil, nil)
|
|
defer it.Close()
|
|
for ; it.Valid(); it.Next() {
|
|
if !isTagKey(it.Key()) {
|
|
continue
|
|
}
|
|
if strings.Contains(extractValueFromKey(it.Key()), c.Operand.(string)) {
|
|
hashes = append(hashes, it.Value())
|
|
}
|
|
}
|
|
} else {
|
|
panic("other operators should be handled already")
|
|
}
|
|
return
|
|
}
|
|
|
|
func (txi *TxIndex) matchRange(r queryRange, prefix []byte) (hashes [][]byte) {
|
|
// create a map to prevent duplicates
|
|
hashesMap := make(map[string][]byte)
|
|
|
|
lowerBound := r.lowerBoundValue()
|
|
upperBound := r.upperBoundValue()
|
|
|
|
it := dbm.IteratePrefix(txi.store, prefix)
|
|
defer it.Close()
|
|
LOOP:
|
|
for ; it.Valid(); it.Next() {
|
|
if !isTagKey(it.Key()) {
|
|
continue
|
|
}
|
|
switch r.AnyBound().(type) {
|
|
case int64:
|
|
v, err := strconv.ParseInt(extractValueFromKey(it.Key()), 10, 64)
|
|
if err != nil {
|
|
continue LOOP
|
|
}
|
|
include := true
|
|
if lowerBound != nil && v < lowerBound.(int64) {
|
|
include = false
|
|
}
|
|
if upperBound != nil && v > upperBound.(int64) {
|
|
include = false
|
|
}
|
|
if include {
|
|
hashesMap[fmt.Sprintf("%X", it.Value())] = it.Value()
|
|
}
|
|
// XXX: passing time in a ABCI Tags is not yet implemented
|
|
// case time.Time:
|
|
// v := strconv.ParseInt(extractValueFromKey(it.Key()), 10, 64)
|
|
// if v == r.upperBound {
|
|
// break
|
|
// }
|
|
}
|
|
}
|
|
hashes = make([][]byte, len(hashesMap))
|
|
i := 0
|
|
for _, h := range hashesMap {
|
|
hashes[i] = h
|
|
i++
|
|
}
|
|
return
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// Keys
|
|
|
|
func startKey(c query.Condition, height int64) []byte {
|
|
var key string
|
|
if height > 0 {
|
|
key = fmt.Sprintf("%s/%v/%d/", c.Tag, c.Operand, height)
|
|
} else {
|
|
key = fmt.Sprintf("%s/%v/", c.Tag, c.Operand)
|
|
}
|
|
return []byte(key)
|
|
}
|
|
|
|
func isTagKey(key []byte) bool {
|
|
return strings.Count(string(key), tagKeySeparator) == 3
|
|
}
|
|
|
|
func extractValueFromKey(key []byte) string {
|
|
parts := strings.SplitN(string(key), tagKeySeparator, 3)
|
|
return parts[1]
|
|
}
|
|
|
|
func keyForTag(tag cmn.KVPair, result *types.TxResult) []byte {
|
|
return []byte(fmt.Sprintf("%s/%s/%d/%d", tag.Key, tag.Value, result.Height, result.Index))
|
|
}
|
|
|
|
func keyForHeight(result *types.TxResult) []byte {
|
|
return []byte(fmt.Sprintf("%s/%d/%d/%d", types.TxHeightKey, result.Height, result.Height, result.Index))
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// Utils
|
|
|
|
func intersect(as, bs [][]byte) [][]byte {
|
|
i := make([][]byte, 0, cmn.MinInt(len(as), len(bs)))
|
|
for _, a := range as {
|
|
for _, b := range bs {
|
|
if bytes.Equal(a, b) {
|
|
i = append(i, a)
|
|
}
|
|
}
|
|
}
|
|
return i
|
|
}
|