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indexer.go
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indexer.go
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package txindex
import (
"errors"
"github.com/tendermint/tendermint/libs/pubsub/query"
"github.com/tendermint/tendermint/types"
)
// TxIndexer interface defines methods to index and search transactions.
type TxIndexer interface {
// AddBatch analyzes, indexes and stores a batch of transactions.
AddBatch(b *Batch) error
// Index analyzes, indexes and stores a single transaction.
Index(result *types.TxResult) error
// Get returns the transaction specified by hash or nil if the transaction is not indexed
// or stored.
Get(hash []byte) (*types.TxResult, error)
// Search allows you to query for transactions.
Search(q *query.Query) ([]*types.TxResult, error)
}
//----------------------------------------------------
// Txs are written as a batch
// Batch groups together multiple Index operations to be performed at the same time.
// NOTE: Batch is NOT thread-safe and must not be modified after starting its execution.
type Batch struct {
Ops []*types.TxResult
}
// NewBatch creates a new Batch.
func NewBatch(n int64) *Batch {
return &Batch{
Ops: make([]*types.TxResult, n),
}
}
// Add or update an entry for the given result.Index.
func (b *Batch) Add(result *types.TxResult) error {
b.Ops[result.Index] = result
return nil
}
// Size returns the total number of operations inside the batch.
func (b *Batch) Size() int {
return len(b.Ops)
}
//----------------------------------------------------
// Errors
// ErrorEmptyHash indicates empty hash
var ErrorEmptyHash = errors.New("Transaction hash cannot be empty")