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import { Cardano, DRepInfo, RewardAccountInfoProvider } from '@cardano-sdk/core';
import {
EMPTY,
Observable,
combineLatest,
concat,
distinctUntilChanged,
filter,
firstValueFrom,
map,
merge,
mergeMap,
of,
startWith,
switchMap,
tap
} from 'rxjs';
import { Logger } from 'ts-log';
import { RetryBackoffConfig } from 'backoff-rxjs';
import { TxInFlight } from '../types';
import { WalletStores } from '../../persistence';
import { blockingWithLatestFrom } from '@cardano-sdk/util-rxjs';
import { pollProvider } from '../util';
import isEqual from 'lodash/isEqual.js';
export type ObservableDrepInfoProvider = (drepIds: Cardano.DRepID[]) => Observable<DRepInfo[]>;
const affectsRewardAccount =
(rewardAccount: Cardano.RewardAccount) =>
(tx: Cardano.OnChainTx): boolean => {
const stakeCredentialHash = Cardano.RewardAccount.toHash(rewardAccount);
const hasRelevantStakeKeyCertificate = Cardano.stakeKeyCertificates(tx.body.certificates).some(
(cert) => cert.stakeCredential.hash === stakeCredentialHash
);
const hasRelevantCertificate =
hasRelevantStakeKeyCertificate ||
tx.body.certificates?.some(
// eslint-disable-next-line complexity
(cert) =>
((cert.__typename === Cardano.CertificateType.MIR ||
cert.__typename === Cardano.CertificateType.StakeDelegation ||
cert.__typename === Cardano.CertificateType.StakeVoteDelegation ||
cert.__typename === Cardano.CertificateType.VoteDelegation) &&
cert.stakeCredential?.hash === stakeCredentialHash) ||
(cert.__typename === Cardano.CertificateType.PoolRegistration &&
cert.poolParameters.rewardAccount === rewardAccount) ||
cert.__typename === Cardano.CertificateType.PoolRetirement ||
((cert.__typename === Cardano.CertificateType.RegisterDelegateRepresentative ||
cert.__typename === Cardano.CertificateType.UnregisterDelegateRepresentative) &&
cert.dRepCredential.hash === stakeCredentialHash) ||
(cert.__typename === Cardano.CertificateType.StakeVoteDelegation &&
cert.stakeCredential.hash === stakeCredentialHash)
);
return (
hasRelevantCertificate ||
tx.body.withdrawals?.some((withdrawal) => withdrawal.stakeAddress === rewardAccount) ||
false
);
};
export const createRewardAccountInfoProvider =
({
epoch$,
externalTrigger$,
rewardAccountInfoProvider,
retryBackoffConfig,
logger
}: {
rewardAccountInfoProvider: RewardAccountInfoProvider;
epoch$: Observable<Cardano.EpochNo>;
externalTrigger$: Observable<void>;
retryBackoffConfig: RetryBackoffConfig;
logger: Logger;
}) =>
(rewardAccount: Cardano.RewardAccount): Observable<Cardano.RewardAccountInfo> =>
pollProvider({
equals: isEqual,
logger,
retryBackoffConfig,
sample: async () => rewardAccountInfoProvider.rewardAccountInfo(rewardAccount, await firstValueFrom(epoch$)),
trigger$: merge(epoch$, externalTrigger$)
});
export type ObservableRewardAccountInfoProvider = ReturnType<typeof createRewardAccountInfoProvider>;
const nextRewardBalance = (rewardAccount: Cardano.RewardAccount, txsInFlight: TxInFlight[]): bigint | null => {
const hasWithdrawal = txsInFlight.some((tx) =>
tx.body.withdrawals?.some((withdrawal) => withdrawal.stakeAddress === rewardAccount)
);
// rewards must be spent in full, or not at all
return hasWithdrawal ? 0n : null;
};
const nextDeposit = (
rewardAccount: Cardano.RewardAccount,
txsInFlight: TxInFlight[],
depositAmount: Cardano.Lovelace
): Cardano.Lovelace | null => {
const stakeCredentialHash = Cardano.RewardAccount.toHash(rewardAccount);
// try to find the last relevant certificate to take effect
for (let txIndex = txsInFlight.length - 1; txIndex >= 0; txIndex--) {
const certificates = txsInFlight[txIndex].body.certificates || [];
for (let certIndex = certificates.length - 1; certIndex >= 0; certIndex--) {
const certificate = certificates[certIndex];
if (
certificate.__typename === Cardano.CertificateType.StakeDeregistration &&
certificate.stakeCredential.hash === stakeCredentialHash
) {
return 0n;
}
Iif (
(certificate.__typename === Cardano.CertificateType.StakeRegistration ||
certificate.__typename === Cardano.CertificateType.StakeRegistrationDelegation ||
certificate.__typename === Cardano.CertificateType.StakeVoteRegistrationDelegation) &&
certificate.stakeCredential.hash === stakeCredentialHash
) {
return depositAmount;
}
}
}
return null;
};
export const createRewardAccountsTracker = ({
rewardAccountAddresses$,
rewardAccountInfoProvider,
store,
newTransaction$,
protocolParameters$,
transactionsInFlight$
}: {
rewardAccountAddresses$: Observable<Cardano.RewardAccount[]>;
store: WalletStores['rewardAccountInfo'];
rewardAccountInfoProvider: ObservableRewardAccountInfoProvider;
newTransaction$: Observable<Cardano.OnChainTx>;
protocolParameters$: Observable<Pick<Cardano.ProtocolParameters, 'stakeKeyDeposit'>>;
transactionsInFlight$: Observable<TxInFlight[]>;
}) =>
rewardAccountAddresses$.pipe(
// TODO:
// eslint-disable-next-line sonarjs/cognitive-complexity
switchMap((rewardAccounts) =>
combineLatest(
rewardAccounts.map((rewardAccount) =>
concat(
store.getValues([rewardAccount]).pipe(mergeMap((values) => (values.length > 0 ? of(values[0]) : EMPTY))),
newTransaction$.pipe(filter(affectsRewardAccount(rewardAccount)), startWith(null)).pipe(
switchMap(() =>
rewardAccountInfoProvider(rewardAccount).pipe(
tap((rewardAccountInfo) => store.setValue(rewardAccount, rewardAccountInfo).subscribe()),
blockingWithLatestFrom(protocolParameters$),
switchMap(([rewardAccountInfo, { stakeKeyDeposit }]) =>
transactionsInFlight$.pipe(
map((txsInFlight): Cardano.RewardAccountInfo => {
if (txsInFlight.length === 0) return rewardAccountInfo;
const nextDepositValue = nextDeposit(rewardAccount, txsInFlight, BigInt(stakeKeyDeposit));
return {
...rewardAccountInfo,
credentialStatus:
typeof nextDepositValue === 'bigint'
? nextDepositValue > 0n
? Cardano.StakeCredentialStatus.Registering
: Cardano.StakeCredentialStatus.Unregistering
: rewardAccountInfo.credentialStatus,
// this ensures that rewards and deposit are not being spent twice if chaining transactions
// as well as updates balance with deposit while transaction is in flight
deposit: nextDepositValue ?? rewardAccountInfo.deposit,
rewardBalance:
nextRewardBalance(rewardAccount, txsInFlight) ?? rewardAccountInfo.rewardBalance
// this may be extended to update dRepDelegatee and delegatee
// based on pending transaction rather than waiting for tx confirmation
};
})
// do not emit when transaction is removed from transactionsInFlight$ due to seeing this tx on chain;
// this will be unsubscribed due to outer switchMap that looks for onChain$ tx that affects this reward account
// TODO: test how this behaves when inFlight$ emits at the same time as newTransaction$
// delay(1)
)
)
)
)
)
).pipe(distinctUntilChanged<Cardano.RewardAccountInfo>(isEqual))
)
)
)
);
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