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55 lines
1.2 KiB
55 lines
1.2 KiB
package indexer
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import (
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"bytes"
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"fmt"
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db "github.com/tendermint/go-db"
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"github.com/tendermint/go-wire"
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"github.com/tendermint/tendermint/types"
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)
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// KV is a simplest possible indexer, backed by Key-Value storage (levelDB).
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// It could only index transaction by its identifier.
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type KV struct {
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store db.DB
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}
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// NewKV returns new instance of KV indexer.
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func NewKV(store db.DB) *KV {
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return &KV{store: store}
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}
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// Tx gets transaction from the KV storage and returns it or nil if the
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// transaction is not found.
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func (indexer *KV) Tx(hash []byte) (*types.TxResult, error) {
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if len(hash) == 0 {
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return nil, ErrorEmptyHash
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}
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rawBytes := indexer.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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// Batch writes a batch of transactions into the KV storage.
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func (indexer *KV) Batch(b *Batch) error {
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storeBatch := indexer.store.NewBatch()
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for hash, result := range b.Ops {
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rawBytes := wire.BinaryBytes(&result)
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storeBatch.Set([]byte(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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