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trust_lines_processor.go
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/
trust_lines_processor.go
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package processors
import (
"context"
"github.com/lantah/go/ingest"
"github.com/lantah/go/services/orbitr/internal/db2/history"
"github.com/lantah/go/support/errors"
"github.com/lantah/go/xdr"
)
type TrustLinesProcessor struct {
trustLinesQ history.QTrustLines
cache *ingest.ChangeCompactor
}
func NewTrustLinesProcessor(trustLinesQ history.QTrustLines) *TrustLinesProcessor {
p := &TrustLinesProcessor{trustLinesQ: trustLinesQ}
p.reset()
return p
}
func (p *TrustLinesProcessor) reset() {
p.cache = ingest.NewChangeCompactor()
}
func (p *TrustLinesProcessor) ProcessChange(ctx context.Context, change ingest.Change) error {
if change.Type != xdr.LedgerEntryTypeTrustline {
return nil
}
err := p.cache.AddChange(change)
if err != nil {
return errors.Wrap(err, "error adding to ledgerCache")
}
if p.cache.Size() > maxBatchSize {
err = p.Commit(ctx)
if err != nil {
return errors.Wrap(err, "error in Commit")
}
p.reset()
}
return nil
}
func trustLineLedgerKey(trustLineEntry xdr.TrustLineEntry) (string, error) {
var ledgerKey xdr.LedgerKey
var ledgerKeyString string
err := ledgerKey.SetTrustline(trustLineEntry.AccountId, trustLineEntry.Asset)
if err != nil {
return "", errors.Wrap(err, "Error creating ledger key")
}
ledgerKeyString, err = ledgerKey.MarshalBinaryBase64()
if err != nil {
return "", errors.Wrap(err, "Error marshaling ledger key")
}
return ledgerKeyString, nil
}
func xdrToTrustline(ledgerEntry xdr.LedgerEntry) (history.TrustLine, error) {
trustLineEntry := ledgerEntry.Data.MustTrustLine()
ledgerKeyString, err := trustLineLedgerKey(trustLineEntry)
if err != nil {
return history.TrustLine{}, errors.Wrap(err, "Error extracting ledger key")
}
assetType := trustLineEntry.Asset.Type
var assetCode, assetIssuer, poolID string
if assetType == xdr.AssetTypeAssetTypePoolShare {
poolID = PoolIDToString(trustLineEntry.Asset.MustLiquidityPoolId())
} else {
if err = trustLineEntry.Asset.ToAsset().Extract(&assetType, &assetCode, &assetIssuer); err != nil {
return history.TrustLine{}, errors.Wrap(err, "Error extracting asset from trustline")
}
}
liabilities := trustLineEntry.Liabilities()
return history.TrustLine{
AccountID: trustLineEntry.AccountId.Address(),
AssetType: assetType,
AssetIssuer: assetIssuer,
AssetCode: assetCode,
Balance: int64(trustLineEntry.Balance),
LedgerKey: ledgerKeyString,
Limit: int64(trustLineEntry.Limit),
LiquidityPoolID: poolID,
BuyingLiabilities: int64(liabilities.Buying),
SellingLiabilities: int64(liabilities.Selling),
Flags: uint32(trustLineEntry.Flags),
LastModifiedLedger: uint32(ledgerEntry.LastModifiedLedgerSeq),
Sponsor: ledgerEntrySponsorToNullString(ledgerEntry),
}, nil
}
func (p *TrustLinesProcessor) Commit(ctx context.Context) error {
var batchUpsertTrustLines []history.TrustLine
var batchRemoveTrustLineKeys []string
changes := p.cache.GetChanges()
for _, change := range changes {
switch {
case change.Post != nil:
tl, err := xdrToTrustline(*change.Post)
if err != nil {
return errors.Wrap(err, "Error extracting trustline")
}
batchUpsertTrustLines = append(batchUpsertTrustLines, tl)
case change.Pre != nil && change.Post == nil:
// Removed
trustLineEntry := change.Pre.Data.MustTrustLine()
ledgerKeyString, err := trustLineLedgerKey(trustLineEntry)
if err != nil {
return errors.Wrap(err, "Error extracting ledger key")
}
batchRemoveTrustLineKeys = append(batchRemoveTrustLineKeys, ledgerKeyString)
default:
return errors.New("Invalid io.Change: change.Pre == nil && change.Post == nil")
}
}
if len(batchUpsertTrustLines) > 0 {
err := p.trustLinesQ.UpsertTrustLines(ctx, batchUpsertTrustLines)
if err != nil {
return errors.Wrap(err, "errors in UpsertTrustLines")
}
}
if len(batchRemoveTrustLineKeys) > 0 {
rowsAffected, err := p.trustLinesQ.RemoveTrustLines(ctx, batchRemoveTrustLineKeys)
if err != nil {
return err
}
if rowsAffected != int64(len(batchRemoveTrustLineKeys)) {
return ingest.NewStateError(errors.Errorf(
"%d rows affected when removing %d trust lines",
rowsAffected,
len(batchRemoveTrustLineKeys),
))
}
}
return nil
}