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asset_stats_set.go
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asset_stats_set.go
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package processors
import (
"math/big"
"github.com/shantanu-hashcash/go/ingest"
"github.com/shantanu-hashcash/go/services/aurora/internal/db2/history"
"github.com/shantanu-hashcash/go/support/errors"
"github.com/shantanu-hashcash/go/xdr"
)
type assetStatKey struct {
assetType xdr.AssetType
assetCode string
assetIssuer string
}
type assetStatValue struct {
assetStatKey
balances assetStatBalances
accounts history.ExpAssetStatAccounts
}
type assetStatBalances struct {
Authorized *big.Int
AuthorizedToMaintainLiabilities *big.Int
ClaimableBalances *big.Int
LiquidityPools *big.Int
Unauthorized *big.Int
}
func newAssetStatBalance() assetStatBalances {
return assetStatBalances{
Authorized: big.NewInt(0),
AuthorizedToMaintainLiabilities: big.NewInt(0),
ClaimableBalances: big.NewInt(0),
LiquidityPools: big.NewInt(0),
Unauthorized: big.NewInt(0),
}
}
func (a *assetStatBalances) Parse(b history.ExpAssetStatBalances) error {
authorized, ok := new(big.Int).SetString(b.Authorized, 10)
if !ok {
return errors.New("Error parsing: " + b.Authorized)
}
a.Authorized = authorized
authorizedToMaintainLiabilities, ok := new(big.Int).SetString(b.AuthorizedToMaintainLiabilities, 10)
if !ok {
return errors.New("Error parsing: " + b.AuthorizedToMaintainLiabilities)
}
a.AuthorizedToMaintainLiabilities = authorizedToMaintainLiabilities
claimableBalances, ok := new(big.Int).SetString(b.ClaimableBalances, 10)
if !ok {
return errors.New("Error parsing: " + b.ClaimableBalances)
}
a.ClaimableBalances = claimableBalances
liquidityPools, ok := new(big.Int).SetString(b.LiquidityPools, 10)
if !ok {
return errors.New("Error parsing: " + b.LiquidityPools)
}
a.LiquidityPools = liquidityPools
unauthorized, ok := new(big.Int).SetString(b.Unauthorized, 10)
if !ok {
return errors.New("Error parsing: " + b.Unauthorized)
}
a.Unauthorized = unauthorized
return nil
}
func (a assetStatBalances) Add(b assetStatBalances) assetStatBalances {
return assetStatBalances{
Authorized: big.NewInt(0).Add(a.Authorized, b.Authorized),
AuthorizedToMaintainLiabilities: big.NewInt(0).Add(a.AuthorizedToMaintainLiabilities, b.AuthorizedToMaintainLiabilities),
ClaimableBalances: big.NewInt(0).Add(a.ClaimableBalances, b.ClaimableBalances),
LiquidityPools: big.NewInt(0).Add(a.LiquidityPools, b.LiquidityPools),
Unauthorized: big.NewInt(0).Add(a.Unauthorized, b.Unauthorized),
}
}
func (a assetStatBalances) IsZero() bool {
return a.Authorized.Cmp(big.NewInt(0)) == 0 &&
a.AuthorizedToMaintainLiabilities.Cmp(big.NewInt(0)) == 0 &&
a.ClaimableBalances.Cmp(big.NewInt(0)) == 0 &&
a.LiquidityPools.Cmp(big.NewInt(0)) == 0 &&
a.Unauthorized.Cmp(big.NewInt(0)) == 0
}
func (a assetStatBalances) ConvertToHistoryObject() history.ExpAssetStatBalances {
return history.ExpAssetStatBalances{
Authorized: a.Authorized.String(),
AuthorizedToMaintainLiabilities: a.AuthorizedToMaintainLiabilities.String(),
ClaimableBalances: a.ClaimableBalances.String(),
LiquidityPools: a.LiquidityPools.String(),
Unauthorized: a.Unauthorized.String(),
}
}
func (value assetStatValue) ConvertToHistoryObject() history.ExpAssetStat {
balances := value.balances.ConvertToHistoryObject()
return history.ExpAssetStat{
AssetType: value.assetType,
AssetCode: value.assetCode,
AssetIssuer: value.assetIssuer,
Accounts: value.accounts,
Balances: balances,
Amount: balances.Authorized,
NumAccounts: value.accounts.Authorized,
}
}
// AssetStatSet represents a collection of asset stats and a mapping
// of Soroban contract IDs to classic assets (which is unique to each
// network).
type AssetStatSet struct {
classicAssetStats map[assetStatKey]*assetStatValue
}
// NewAssetStatSet constructs a new AssetStatSet instance
func NewAssetStatSet() AssetStatSet {
return AssetStatSet{
classicAssetStats: map[assetStatKey]*assetStatValue{},
}
}
type delta struct {
Authorized int64
AuthorizedToMaintainLiabilities int64
Unauthorized int64
ClaimableBalances int64
LiquidityPools int64
}
func (d *delta) addByFlags(flags xdr.Uint32, amount int64) {
f := xdr.TrustLineFlags(flags)
if f.IsAuthorized() {
d.Authorized += amount
} else if f.IsAuthorizedToMaintainLiabilitiesFlag() {
d.AuthorizedToMaintainLiabilities += amount
} else {
d.Unauthorized += amount
}
}
func (d delta) isEmpty() bool {
return d == delta{}
}
// addDelta adds a delta balance and delta accounts to a given asset trustline.
func (s AssetStatSet) addDelta(asset xdr.Asset, deltaBalances, deltaAccounts delta) error {
if deltaBalances.isEmpty() && deltaAccounts.isEmpty() {
return nil
}
var key assetStatKey
if err := asset.Extract(&key.assetType, &key.assetCode, &key.assetIssuer); err != nil {
return errors.Wrap(err, "could not extract asset info from trustline")
}
current, ok := s.classicAssetStats[key]
if !ok {
current = &assetStatValue{assetStatKey: key, balances: newAssetStatBalance()}
s.classicAssetStats[key] = current
}
current.accounts.Authorized += int32(deltaAccounts.Authorized)
current.accounts.AuthorizedToMaintainLiabilities += int32(deltaAccounts.AuthorizedToMaintainLiabilities)
current.accounts.ClaimableBalances += int32(deltaAccounts.ClaimableBalances)
current.accounts.LiquidityPools += int32(deltaAccounts.LiquidityPools)
current.accounts.Unauthorized += int32(deltaAccounts.Unauthorized)
current.balances.Authorized.Add(current.balances.Authorized, big.NewInt(deltaBalances.Authorized))
current.balances.AuthorizedToMaintainLiabilities.Add(current.balances.AuthorizedToMaintainLiabilities, big.NewInt(deltaBalances.AuthorizedToMaintainLiabilities))
current.balances.ClaimableBalances.Add(current.balances.ClaimableBalances, big.NewInt(deltaBalances.ClaimableBalances))
current.balances.LiquidityPools.Add(current.balances.LiquidityPools, big.NewInt(deltaBalances.LiquidityPools))
current.balances.Unauthorized.Add(current.balances.Unauthorized, big.NewInt(deltaBalances.Unauthorized))
// Note: it's possible that after operations above:
// numAccounts != 0 && amount == 0 (ex. two accounts send some of their assets to third account)
// OR
// numAccounts == 0 && amount != 0 (ex. issuer issued an asset)
if current.balances.IsZero() && current.accounts.IsZero() {
delete(s.classicAssetStats, key)
}
return nil
}
// AddTrustline updates the set to account for how a given trustline has changed.
// change must be a xdr.LedgerEntryTypeTrustLine type.
func (s AssetStatSet) AddTrustline(change ingest.Change) error {
var pre, post *xdr.TrustLineEntry
if change.Pre != nil {
pre = change.Pre.Data.TrustLine
}
if change.Post != nil {
post = change.Post.Data.TrustLine
}
deltaAccounts := delta{}
deltaBalances := delta{}
if pre == nil && post == nil {
return ingest.NewStateError(errors.New("both pre and post trustlines cannot be nil"))
}
var asset xdr.TrustLineAsset
if pre != nil {
asset = pre.Asset
deltaAccounts.addByFlags(pre.Flags, -1)
deltaBalances.addByFlags(pre.Flags, -int64(pre.Balance))
}
if post != nil {
asset = post.Asset
deltaAccounts.addByFlags(post.Flags, 1)
deltaBalances.addByFlags(post.Flags, int64(post.Balance))
}
if asset.Type == xdr.AssetTypeAssetTypePoolShare || asset.Type == xdr.AssetTypeAssetTypeNative {
return nil
}
err := s.addDelta(asset.ToAsset(), deltaBalances, deltaAccounts)
if err != nil {
return errors.Wrap(err, "error running AssetStatSet.addDelta")
}
return nil
}
// AddLiquidityPool updates the set to account for how a given liquidity pool has changed.
// change must be a xdr.LedgerEntryTypeLiqidityPool type.
func (s AssetStatSet) AddLiquidityPool(change ingest.Change) error {
var pre, post *xdr.LiquidityPoolEntry
if change.Pre != nil {
pre = change.Pre.Data.LiquidityPool
}
if change.Post != nil {
post = change.Post.Data.LiquidityPool
}
assetAdeltaNum := delta{}
assetAdeltaBalances := delta{}
assetBdeltaNum := delta{}
assetBdeltaBalances := delta{}
if pre == nil && post == nil {
return ingest.NewStateError(errors.New("both pre and post liquidity pools cannot be nil"))
}
lpType, err := change.GetLiquidityPoolType()
if err != nil {
return ingest.NewStateError(err)
}
var assetA, assetB xdr.Asset
switch lpType {
case xdr.LiquidityPoolTypeLiquidityPoolConstantProduct:
if pre != nil {
assetA = pre.Body.ConstantProduct.Params.AssetA
assetAdeltaNum.LiquidityPools--
assetAdeltaBalances.LiquidityPools -= int64(pre.Body.ConstantProduct.ReserveA)
assetB = pre.Body.ConstantProduct.Params.AssetB
assetBdeltaNum.LiquidityPools--
assetBdeltaBalances.LiquidityPools -= int64(pre.Body.ConstantProduct.ReserveB)
}
if post != nil {
assetA = post.Body.ConstantProduct.Params.AssetA
assetAdeltaNum.LiquidityPools++
assetAdeltaBalances.LiquidityPools += int64(post.Body.ConstantProduct.ReserveA)
assetB = post.Body.ConstantProduct.Params.AssetB
assetBdeltaNum.LiquidityPools++
assetBdeltaBalances.LiquidityPools += int64(post.Body.ConstantProduct.ReserveB)
}
default:
return errors.Errorf("Unknown liquidity pool type=%d", lpType)
}
if assetA.Type != xdr.AssetTypeAssetTypeNative {
err := s.addDelta(assetA, assetAdeltaBalances, assetAdeltaNum)
if err != nil {
return errors.Wrap(err, "error running AssetStatSet.addDelta using AssetA")
}
}
if assetB.Type != xdr.AssetTypeAssetTypeNative {
err := s.addDelta(assetB, assetBdeltaBalances, assetBdeltaNum)
if err != nil {
return errors.Wrap(err, "error running AssetStatSet.addDelta using AssetB")
}
}
return nil
}
// AddClaimableBalance updates the set to account for how a given claimable balance has changed.
// change must be a xdr.LedgerEntryTypeClaimableBalance type.
func (s AssetStatSet) AddClaimableBalance(change ingest.Change) error {
var pre, post *xdr.ClaimableBalanceEntry
if change.Pre != nil {
pre = change.Pre.Data.ClaimableBalance
}
if change.Post != nil {
post = change.Post.Data.ClaimableBalance
}
deltaAccounts := delta{}
deltaBalances := delta{}
if pre == nil && post == nil {
return ingest.NewStateError(errors.New("both pre and post claimable balances cannot be nil"))
}
var asset xdr.Asset
if pre != nil {
asset = pre.Asset
deltaAccounts.ClaimableBalances--
deltaBalances.ClaimableBalances -= int64(pre.Amount)
}
if post != nil {
asset = post.Asset
deltaAccounts.ClaimableBalances++
deltaBalances.ClaimableBalances += int64(post.Amount)
}
if asset.Type == xdr.AssetTypeAssetTypeNative {
return nil
}
err := s.addDelta(asset, deltaBalances, deltaAccounts)
if err != nil {
return errors.Wrap(err, "error running AssetStatSet.addDelta")
}
return nil
}
// All returns a list of all `history.ExpAssetStat` contained within the set
// along with all contract id attribution changes in the set.
func (s AssetStatSet) All() []history.ExpAssetStat {
assetStats := make([]history.ExpAssetStat, 0, len(s.classicAssetStats))
for _, value := range s.classicAssetStats {
assetStats = append(assetStats, value.ConvertToHistoryObject())
}
return assetStats
}