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58 lines
1.3 KiB
58 lines
1.3 KiB
package kv
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import (
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"bytes"
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"fmt"
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"github.com/tendermint/go-wire"
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db "github.com/tendermint/tmlibs/db"
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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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// TxIndex is the simplest possible indexer, backed by Key-Value storage (levelDB).
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// It can only index transaction by its identifier.
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type TxIndex struct {
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store db.DB
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}
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// NewTxIndex returns new instance of TxIndex.
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func NewTxIndex(store db.DB) *TxIndex {
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return &TxIndex{store: store}
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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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r := bytes.NewReader(rawBytes)
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var n int
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var err error
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txResult := wire.ReadBinary(&types.TxResult{}, r, 0, &n, &err).(*types.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 writes a batch of transactions into the TxIndex storage.
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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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rawBytes := wire.BinaryBytes(&result)
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storeBatch.Set(result.Tx.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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