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change_processors.go
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change_processors.go
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package processors
import (
"context"
"io"
"github.com/xdbfoundation/go/ingest"
"github.com/xdbfoundation/go/support/errors"
)
type ChangeProcessor interface {
ProcessChange(ctx context.Context, change ingest.Change) error
}
type LedgerTransactionProcessor interface {
ProcessTransaction(ctx context.Context, transaction ingest.LedgerTransaction) error
}
type LedgerTransactionFilterer interface {
FilterTransaction(ctx context.Context, transaction ingest.LedgerTransaction) (bool, error)
}
func StreamLedgerTransactions(
ctx context.Context,
txFilterer LedgerTransactionFilterer,
filteredTxProcessor LedgerTransactionProcessor,
txProcessor LedgerTransactionProcessor,
reader *ingest.LedgerTransactionReader,
) error {
for {
tx, err := reader.Read()
if err == io.EOF {
return nil
}
if err != nil {
return errors.Wrap(err, "could not read transaction")
}
include, err := txFilterer.FilterTransaction(ctx, tx)
if err != nil {
return errors.Wrapf(
err,
"could not filter transaction %v",
tx.Index,
)
}
if !include {
if err = filteredTxProcessor.ProcessTransaction(ctx, tx); err != nil {
return errors.Wrapf(
err,
"could not process transaction %v",
tx.Index,
)
}
log.Debugf("Filters did not find match on transaction, dropping this tx with hash %v", tx.Result.TransactionHash.HexString())
continue
}
if err = txProcessor.ProcessTransaction(ctx, tx); err != nil {
return errors.Wrapf(
err,
"could not process transaction %v",
tx.Index,
)
}
}
}
func StreamChanges(
ctx context.Context,
changeProcessor ChangeProcessor,
reader ingest.ChangeReader,
) error {
for {
change, err := reader.Read()
if err == io.EOF {
return nil
}
if err != nil {
return errors.Wrap(err, "could not read transaction")
}
if err = changeProcessor.ProcessChange(ctx, change); err != nil {
return errors.Wrap(
err,
"could not process change",
)
}
}
}