/
main.go
97 lines (82 loc) · 2.56 KB
/
main.go
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// Package results provides an implementation of the txsub.ResultProvider interface
// backed using the SQL databases used by both digitalbits core and frontier
package results
import (
"bytes"
"context"
"encoding/base64"
"github.com/digitalbitsorg/go/services/frontier/internal/db2/core"
"github.com/digitalbitsorg/go/services/frontier/internal/db2/history"
"github.com/digitalbitsorg/go/services/frontier/internal/ledger"
"github.com/digitalbitsorg/go/services/frontier/internal/txsub"
"github.com/digitalbitsorg/go/xdr"
)
// DB provides transactio submission results by querying the
// connected frontier and digitalbits core databases.
type DB struct {
Core *core.Q
History *history.Q
}
var _ txsub.ResultProvider = &DB{}
// ResultByHash implements txsub.ResultProvider
func (rp *DB) ResultByHash(ctx context.Context, hash string) txsub.Result {
// query history database
var hr history.Transaction
err := rp.History.TransactionByHash(&hr, hash)
if err == nil {
return txResultFromHistory(hr)
}
if !rp.History.NoRows(err) {
return txsub.Result{Err: err}
}
// query core database
var cr core.Transaction
err = rp.Core.TransactionByHashAfterLedger(&cr, hash, ledger.CurrentState().HistoryLatest)
if err == nil {
return txResultFromCore(cr)
}
if !rp.Core.NoRows(err) {
return txsub.Result{Err: err}
}
// if no result was found in either db, return ErrNoResults
return txsub.Result{Err: txsub.ErrNoResults}
}
func txResultFromHistory(tx history.Transaction) txsub.Result {
return txsub.Result{
Hash: tx.TransactionHash,
LedgerSequence: tx.LedgerSequence,
EnvelopeXDR: tx.TxEnvelope,
ResultXDR: tx.TxResult,
ResultMetaXDR: tx.TxMeta,
}
}
func txResultFromCore(tx core.Transaction) txsub.Result {
// re-encode result to base64
var raw bytes.Buffer
_, err := xdr.Marshal(&raw, tx.Result.Result)
if err != nil {
return txsub.Result{Err: err}
}
trx := base64.StdEncoding.EncodeToString(raw.Bytes())
// if result is success, send a normal resposne
if tx.Result.Result.Result.Code == xdr.TransactionResultCodeTxSuccess {
return txsub.Result{
Hash: tx.TransactionHash,
LedgerSequence: tx.LedgerSequence,
EnvelopeXDR: tx.EnvelopeXDR(),
ResultXDR: trx,
ResultMetaXDR: tx.ResultMetaXDR(),
}
}
// if failed, produce a FailedTransactionError
return txsub.Result{
Err: &txsub.FailedTransactionError{
ResultXDR: trx,
},
Hash: tx.TransactionHash,
LedgerSequence: tx.LedgerSequence,
EnvelopeXDR: tx.EnvelopeXDR(),
ResultXDR: trx,
ResultMetaXDR: tx.ResultMetaXDR(),
}
}