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asset_stats_processor.go
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asset_stats_processor.go
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package processors
import (
"context"
"database/sql"
"encoding/hex"
"math/big"
"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 AssetStatsProcessor struct {
assetStatsQ history.QAssetStats
cache *ingest.ChangeCompactor
assetStatSet AssetStatSet
useLedgerEntryCache bool
networkPassphrase string
}
// NewAssetStatsProcessor constructs a new AssetStatsProcessor instance.
// If useLedgerEntryCache is false we don't use ledger cache and we just
// add trust lines to assetStatSet, then we insert all the stats in one
// insert query. This is done to make history buckets processing faster
// (batch inserting).
func NewAssetStatsProcessor(
assetStatsQ history.QAssetStats,
networkPassphrase string,
useLedgerEntryCache bool,
) *AssetStatsProcessor {
p := &AssetStatsProcessor{
assetStatsQ: assetStatsQ,
useLedgerEntryCache: useLedgerEntryCache,
networkPassphrase: networkPassphrase,
}
p.reset()
return p
}
func (p *AssetStatsProcessor) reset() {
p.cache = ingest.NewChangeCompactor()
p.assetStatSet = NewAssetStatSet(p.networkPassphrase)
}
func (p *AssetStatsProcessor) ProcessChange(ctx context.Context, change ingest.Change) error {
if change.Type != xdr.LedgerEntryTypeLiquidityPool &&
change.Type != xdr.LedgerEntryTypeClaimableBalance &&
change.Type != xdr.LedgerEntryTypeTrustline &&
change.Type != xdr.LedgerEntryTypeContractData {
return nil
}
if p.useLedgerEntryCache {
return p.addToCache(ctx, change)
}
if change.Pre != nil || change.Post == nil {
return errors.New("AssetStatsProcessor is in insert only mode")
}
switch change.Type {
case xdr.LedgerEntryTypeLiquidityPool:
return p.assetStatSet.AddLiquidityPool(change)
case xdr.LedgerEntryTypeClaimableBalance:
return p.assetStatSet.AddClaimableBalance(change)
case xdr.LedgerEntryTypeTrustline:
return p.assetStatSet.AddTrustline(change)
case xdr.LedgerEntryTypeContractData:
return p.assetStatSet.AddContractData(change)
default:
return nil
}
}
func (p *AssetStatsProcessor) addToCache(ctx context.Context, change ingest.Change) error {
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 (p *AssetStatsProcessor) Commit(ctx context.Context) error {
if !p.useLedgerEntryCache {
assetStatsDeltas, err := p.assetStatSet.AllFromSnapshot()
if err != nil {
return err
}
if len(assetStatsDeltas) == 0 {
return nil
}
return p.assetStatsQ.InsertAssetStats(ctx, assetStatsDeltas, maxBatchSize)
}
changes := p.cache.GetChanges()
for _, change := range changes {
var err error
switch change.Type {
case xdr.LedgerEntryTypeLiquidityPool:
err = p.assetStatSet.AddLiquidityPool(change)
case xdr.LedgerEntryTypeClaimableBalance:
err = p.assetStatSet.AddClaimableBalance(change)
case xdr.LedgerEntryTypeTrustline:
err = p.assetStatSet.AddTrustline(change)
case xdr.LedgerEntryTypeContractData:
err = p.assetStatSet.AddContractData(change)
default:
return errors.Errorf("Change type %v is unexpected", change.Type)
}
if err != nil {
return errors.Wrap(err, "Error adjusting asset stat")
}
}
assetStatsDeltas, contractToAsset, contractAssetStats := p.assetStatSet.All()
for _, delta := range assetStatsDeltas {
var rowsAffected int64
var stat history.ExpAssetStat
var err error
// asset stats only supports non-native assets
asset := xdr.MustNewCreditAsset(delta.AssetCode, delta.AssetIssuer)
contractID, err := asset.ContractID(p.networkPassphrase)
if err != nil {
return errors.Wrap(err, "cannot compute contract id for asset")
}
if contractAssetStat, ok := contractAssetStats[contractID]; ok {
delta.Balances.Contracts = contractAssetStat.balance.String()
delta.Accounts.Contracts = contractAssetStat.numHolders
delete(contractAssetStats, contractID)
}
stat, err = p.assetStatsQ.GetAssetStat(ctx,
delta.AssetType,
delta.AssetCode,
delta.AssetIssuer,
)
assetStatNotFound := err == sql.ErrNoRows
if !assetStatNotFound && err != nil {
return errors.Wrap(err, "could not fetch asset stat from db")
}
assetStatFound := !assetStatNotFound
if assetStatFound {
delta.ContractID = stat.ContractID
}
if asset, ok := contractToAsset[contractID]; ok && asset == nil {
if assetStatFound && stat.ContractID == nil {
return ingest.NewStateError(errors.Errorf(
"row has no contract id to remove %s: %s %s %s",
hex.EncodeToString(contractID[:]),
stat.AssetType,
stat.AssetCode,
stat.AssetIssuer,
))
}
delta.ContractID = nil
} else if ok {
if assetStatFound && stat.ContractID != nil {
return ingest.NewStateError(errors.Errorf(
"attempting to set contract id %s but row %s already has contract id set: %s",
hex.EncodeToString(contractID[:]),
asset.String(),
hex.EncodeToString((*stat.ContractID)[:]),
))
}
delta.SetContractID(contractID)
}
delete(contractToAsset, contractID)
if assetStatNotFound {
// Safety checks
if delta.Accounts.Authorized < 0 {
return ingest.NewStateError(errors.Errorf(
"Authorized accounts negative but DB entry does not exist for asset: %s %s %s",
delta.AssetType,
delta.AssetCode,
delta.AssetIssuer,
))
} else if delta.Accounts.AuthorizedToMaintainLiabilities < 0 {
return ingest.NewStateError(errors.Errorf(
"AuthorizedToMaintainLiabilities accounts negative but DB entry does not exist for asset: %s %s %s",
delta.AssetType,
delta.AssetCode,
delta.AssetIssuer,
))
} else if delta.Accounts.Unauthorized < 0 {
return ingest.NewStateError(errors.Errorf(
"Unauthorized accounts negative but DB entry does not exist for asset: %s %s %s",
delta.AssetType,
delta.AssetCode,
delta.AssetIssuer,
))
} else if delta.Accounts.ClaimableBalances < 0 {
return ingest.NewStateError(errors.Errorf(
"Claimable balance negative but DB entry does not exist for asset: %s %s %s",
delta.AssetType,
delta.AssetCode,
delta.AssetIssuer,
))
} else if delta.Accounts.LiquidityPools < 0 {
return ingest.NewStateError(errors.Errorf(
"Liquidity pools negative but DB entry does not exist for asset: %s %s %s",
delta.AssetType,
delta.AssetCode,
delta.AssetIssuer,
))
}
// Insert
var errInsert error
rowsAffected, errInsert = p.assetStatsQ.InsertAssetStat(ctx, delta)
if errInsert != nil {
return errors.Wrap(errInsert, "could not insert asset stat")
}
} else {
var statBalances assetStatBalances
if err = statBalances.Parse(&stat.Balances); err != nil {
return errors.Wrap(err, "Error parsing balances")
}
var deltaBalances assetStatBalances
if err = deltaBalances.Parse(&delta.Balances); err != nil {
return errors.Wrap(err, "Error parsing balances")
}
statBalances = statBalances.Add(deltaBalances)
statAccounts := stat.Accounts.Add(delta.Accounts)
// only remove asset stat if the Metadata contract data ledger entry for the token contract
// has also been removed.
if statAccounts.IsZero() && delta.ContractID == nil {
// Remove stats
if !statBalances.IsZero() {
return ingest.NewStateError(errors.Errorf(
"Removing asset stat by final amount non-zero for: %s %s %s",
delta.AssetType,
delta.AssetCode,
delta.AssetIssuer,
))
}
rowsAffected, err = p.assetStatsQ.RemoveAssetStat(ctx,
delta.AssetType,
delta.AssetCode,
delta.AssetIssuer,
)
if err != nil {
return errors.Wrap(err, "could not remove asset stat")
}
} else {
// Update
rowsAffected, err = p.assetStatsQ.UpdateAssetStat(ctx, history.ExpAssetStat{
AssetType: delta.AssetType,
AssetCode: delta.AssetCode,
AssetIssuer: delta.AssetIssuer,
Accounts: statAccounts,
Balances: statBalances.ConvertToHistoryObject(),
Amount: statBalances.Authorized.String(),
NumAccounts: statAccounts.Authorized,
ContractID: delta.ContractID,
})
if err != nil {
return errors.Wrap(err, "could not update asset stat")
}
}
}
if rowsAffected != 1 {
return ingest.NewStateError(errors.Errorf(
"%d rows affected (expected exactly 1) when adjusting asset stat for asset: %s %s %s",
rowsAffected,
delta.AssetType,
delta.AssetCode,
delta.AssetIssuer,
))
}
}
if err := p.updateContractIDs(ctx, contractToAsset, contractAssetStats); err != nil {
return err
}
return p.updateContractAssetStats(ctx, contractAssetStats)
}
func (p *AssetStatsProcessor) updateContractIDs(
ctx context.Context,
contractToAsset map[[32]byte]*xdr.Asset,
contractAssetStats map[[32]byte]contractAssetStatValue,
) error {
for contractID, asset := range contractToAsset {
if err := p.updateContractID(ctx, contractAssetStats, contractID, asset); err != nil {
return err
}
}
return nil
}
// updateContractID will update the asset stat row for the corresponding asset to either add or remove the given contract id
func (p *AssetStatsProcessor) updateContractID(
ctx context.Context,
contractAssetStats map[[32]byte]contractAssetStatValue,
contractID [32]byte,
asset *xdr.Asset,
) error {
var rowsAffected int64
// asset is nil so we need to set the contract_id column to NULL
if asset == nil {
stat, err := p.assetStatsQ.GetAssetStatByContract(ctx, contractID)
if err == sql.ErrNoRows {
return ingest.NewStateError(errors.Errorf(
"row for asset with contract %s is missing",
hex.EncodeToString(contractID[:]),
))
}
if err != nil {
return errors.Wrap(err, "error querying asset by contract id")
}
if err = p.maybeAddContractAssetStat(contractAssetStats, contractID, &stat); err != nil {
return errors.Wrapf(err, "could not update asset stat with contract id %v with contract delta", contractID)
}
if stat.Accounts.IsZero() {
if !stat.Balances.IsZero() {
return ingest.NewStateError(errors.Errorf(
"asset stat has 0 holders but non zero balance: %s",
hex.EncodeToString(contractID[:]),
))
}
// the asset stat is empty so we can remove the row entirely
rowsAffected, err = p.assetStatsQ.RemoveAssetStat(ctx,
stat.AssetType,
stat.AssetCode,
stat.AssetIssuer,
)
if err != nil {
return errors.Wrap(err, "could not remove asset stat")
}
} else if stat.Accounts.Contracts != 0 || stat.Balances.Contracts != "0" {
return ingest.NewStateError(errors.Errorf(
"asset stat has contract holders but is attempting to remove contract id: %s",
hex.EncodeToString(contractID[:]),
))
} else {
// update the row to set the contract_id column to NULL
stat.ContractID = nil
rowsAffected, err = p.assetStatsQ.UpdateAssetStat(ctx, stat)
if err != nil {
return errors.Wrap(err, "could not update asset stat")
}
}
} else { // asset is non nil, so we need to populate the contract_id column
var assetType xdr.AssetType
var assetCode, assetIssuer string
asset.MustExtract(&assetType, &assetCode, &assetIssuer)
stat, err := p.assetStatsQ.GetAssetStat(ctx, assetType, assetCode, assetIssuer)
if err == sql.ErrNoRows {
// there is no asset stat for the given asset so we need to create a new row
row := history.ExpAssetStat{
AssetType: assetType,
AssetCode: assetCode,
AssetIssuer: assetIssuer,
Accounts: history.ExpAssetStatAccounts{},
Balances: newAssetStatBalance().ConvertToHistoryObject(),
Amount: "0",
NumAccounts: 0,
}
row.SetContractID(contractID)
if err = p.maybeAddContractAssetStat(contractAssetStats, contractID, &row); err != nil {
return errors.Wrapf(err, "could not update asset stat with contract id %v with contract delta", contractID)
}
rowsAffected, err = p.assetStatsQ.InsertAssetStat(ctx, row)
if err != nil {
return errors.Wrap(err, "could not insert asset stat")
}
} else if err != nil {
return errors.Wrap(err, "error querying asset by asset code and issuer")
} else if dbContractID, ok := stat.GetContractID(); ok {
// the asset stat already has a column_id set which is unexpected (the column should be NULL)
return ingest.NewStateError(errors.Errorf(
"attempting to set contract id %s but row %s already has contract id set: %s",
hex.EncodeToString(contractID[:]),
asset.String(),
hex.EncodeToString(dbContractID[:]),
))
} else {
// update the column_id column
stat.SetContractID(contractID)
if err = p.maybeAddContractAssetStat(contractAssetStats, contractID, &stat); err != nil {
return errors.Wrapf(err, "could not update asset stat with contract id %v with contract delta", contractID)
}
rowsAffected, err = p.assetStatsQ.UpdateAssetStat(ctx, stat)
if err != nil {
return errors.Wrap(err, "could not update asset stat")
}
}
}
if rowsAffected != 1 {
// assert that we have updated exactly one row
return ingest.NewStateError(errors.Errorf(
"%d rows affected (expected exactly 1) when adjusting asset stat for asset: %s",
rowsAffected,
asset.String(),
))
}
return nil
}
func (p *AssetStatsProcessor) addContractAssetStat(contractAssetStat contractAssetStatValue, stat *history.ExpAssetStat) error {
stat.Accounts.Contracts += contractAssetStat.numHolders
contracts, ok := new(big.Int).SetString(stat.Balances.Contracts, 10)
if !ok {
return errors.New("Error parsing: " + stat.Balances.Contracts)
}
stat.Balances.Contracts = (new(big.Int).Add(contracts, contractAssetStat.balance)).String()
return nil
}
func (p *AssetStatsProcessor) maybeAddContractAssetStat(contractAssetStats map[[32]byte]contractAssetStatValue, contractID [32]byte, stat *history.ExpAssetStat) error {
if contractAssetStat, ok := contractAssetStats[contractID]; ok {
if err := p.addContractAssetStat(contractAssetStat, stat); err != nil {
return err
}
delete(contractAssetStats, contractID)
}
return nil
}
func (p *AssetStatsProcessor) updateContractAssetStats(
ctx context.Context,
contractAssetStats map[[32]byte]contractAssetStatValue,
) error {
for contractID, contractAssetStat := range contractAssetStats {
if err := p.updateContractAssetStat(ctx, contractID, contractAssetStat); err != nil {
return err
}
}
return nil
}
// updateContractAssetStat will look up an asset stat by contract id and, if it exists,
// it will adjust the contract balance and holders based on contractAssetStatValue
func (p *AssetStatsProcessor) updateContractAssetStat(
ctx context.Context,
contractID [32]byte,
contractAssetStat contractAssetStatValue,
) error {
stat, err := p.assetStatsQ.GetAssetStatByContract(ctx, contractID)
if err == sql.ErrNoRows {
return nil
} else if err != nil {
return errors.Wrap(err, "error querying asset by contract id")
}
if err = p.addContractAssetStat(contractAssetStat, &stat); err != nil {
return errors.Wrapf(err, "could not update asset stat with contract id %v with contract delta", contractID)
}
var rowsAffected int64
rowsAffected, err = p.assetStatsQ.UpdateAssetStat(ctx, stat)
if err != nil {
return errors.Wrap(err, "could not update asset stat")
}
if rowsAffected != 1 {
// assert that we have updated exactly one row
return ingest.NewStateError(errors.Errorf(
"%d rows affected (expected exactly 1) when adjusting asset stat for asset: %s",
rowsAffected,
stat.AssetCode+":"+stat.AssetIssuer,
))
}
return nil
}