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import { DocumentStore, OrderedCollectionStore } from '../persistence';
import {
EMPTY,
NEVER,
Observable,
Subject,
combineLatest,
concat,
defaultIfEmpty,
distinctUntilChanged,
exhaustMap,
filter,
from,
map,
merge,
mergeMap,
mergeWith,
of,
partition,
race,
scan,
share,
startWith,
switchMap,
take,
takeUntil,
tap,
withLatestFrom
} from 'rxjs';
import { FailedTx, OutgoingOnChainTx, OutgoingTx, TransactionFailure, TransactionsTracker, TxInFlight } from './types';
import { Logger } from 'ts-log';
import { Range, Shutdown, contextLogger } from '@cardano-sdk/util';
import { RetryBackoffConfig } from 'backoff-rxjs';
import { TrackerSubject, coldObservableProvider } from '@cardano-sdk/util-rxjs';
import { distinctBlock, signedTxsEquals, transactionsEquals, txInEquals } from './util';
import { WitnessedTx } from '@cardano-sdk/key-management';
import { newAndStoredMulticast } from './util/newAndStoredMulticast';
import chunk from 'lodash/chunk.js';
import sortBy from 'lodash/sortBy.js';
export interface TransactionsTrackerProps {
chainHistoryProvider: ChainHistoryProvider;
addresses$: Observable<Cardano.PaymentAddress[]>;
tip$: Observable<Cardano.Tip>;
retryBackoffConfig: RetryBackoffConfig;
transactionsHistoryStore: OrderedCollectionStore<Cardano.HydratedTx>;
inFlightTransactionsStore: DocumentStore<TxInFlight[]>;
signedTransactionsStore: DocumentStore<WitnessedTx[]>;
newTransactions: {
submitting$: Observable<OutgoingTx>;
pending$: Observable<OutgoingTx>;
failedToSubmit$: Observable<FailedTx>;
signed$: Observable<WitnessedTx>;
};
failedFromReemitter$?: Observable<FailedTx>;
logger: Logger;
onFatalError?: (value: unknown) => void;
}
export interface TransactionsTrackerInternals {
transactionsSource$: Observable<Cardano.HydratedTx[]>;
rollback$: Observable<Cardano.HydratedTx>;
}
export interface TransactionsTrackerInternalsProps {
chainHistoryProvider: ChainHistoryProvider;
addresses$: Observable<Cardano.PaymentAddress[]>;
retryBackoffConfig: RetryBackoffConfig;
tipBlockHeight$: Observable<Cardano.BlockNo>;
store: OrderedCollectionStore<Cardano.HydratedTx>;
logger: Logger;
onFatalError?: (value: unknown) => void;
}
// Temporarily hardcoded. Will be replaced with ChainHistoryProvider 'maxPageSize' value once ADP-2249 is implemented
export const PAGE_SIZE = 25;
const allTransactionsByAddresses = async (
chainHistoryProvider: ChainHistoryProvider,
{ addresses, blockRange }: { addresses: Cardano.PaymentAddress[]; blockRange: Range<Cardano.BlockNo> }
): Promise<Cardano.HydratedTx[]> => {
const addressesSubGroups = chunk(addresses, PAGE_SIZE);
let response: Cardano.HydratedTx[] = [];
for (const addressGroup of addressesSubGroups) {
let startAt = 0;
let pageResults: Cardano.HydratedTx[] = [];
do {
pageResults = (
await chainHistoryProvider.transactionsByAddresses({
addresses: addressGroup,
blockRange,
pagination: { limit: PAGE_SIZE, startAt }
})
).pageResults;
startAt += PAGE_SIZE;
response = [...response, ...pageResults];
} while (pageResults.length === PAGE_SIZE);
}
return response;
};
const getLastTransactionsAtBlock = (
transactions: Cardano.HydratedTx[],
blockNo: Cardano.BlockNo
): Cardano.HydratedTx[] => {
const txsFromSameBlock = [];
for (let i = transactions.length - 1; i >= 0; --i) {
const tx = transactions[i];
if (tx.blockHeader.blockNo === blockNo) {
txsFromSameBlock.push(tx);
} else {
break;
}
}
return txsFromSameBlock;
};
export const revertLastBlock = (
localTransactions: Cardano.HydratedTx[],
blockNo: Cardano.BlockNo,
rollback$: Subject<Cardano.HydratedTx>,
newTransactions: Cardano.HydratedTx[],
logger: Logger
) => {
const result = [...localTransactions];
while (result.length > 0) {
const lastKnownTx = result[result.length - 1];
if (lastKnownTx.blockHeader.blockNo === blockNo) {
// only emit if the tx is also not present in the new transactions to be added
if (newTransactions.findIndex((tx) => tx.id === lastKnownTx.id) === -1) {
logger.debug(`Transaction ${lastKnownTx.id} was rolled back`);
rollback$.next(lastKnownTx);
}
result.pop();
} else {
break;
}
}
return result;
};
const findIntersectionAndUpdateTxStore = ({
chainHistoryProvider,
logger,
store,
retryBackoffConfig,
onFatalError,
tipBlockHeight$,
rollback$,
localTransactions,
addresses
}: Pick<
TransactionsTrackerInternalsProps,
'chainHistoryProvider' | 'logger' | 'store' | 'retryBackoffConfig' | 'onFatalError' | 'tipBlockHeight$'
> & {
localTransactions: Cardano.HydratedTx[];
rollback$: Subject<Cardano.HydratedTx>;
addresses: Cardano.PaymentAddress[];
}) =>
coldObservableProvider({
// Do not re-fetch transactions twice on load when tipBlockHeight$ loads from storage first
// It should also help when using poor internet connection.
// Caveat is that local transactions might get out of date...
combinator: exhaustMap,
equals: transactionsEquals,
onFatalError,
// eslint-disable-next-line sonarjs/cognitive-complexity
provider: async () => {
let rollbackOcurred = false;
// eslint-disable-next-line no-constant-condition
while (true) {
const lastStoredTransaction: Cardano.HydratedTx | undefined = localTransactions[localTransactions.length - 1];
lastStoredTransaction &&
logger.debug(
`Last stored tx: ${lastStoredTransaction?.id} block:${lastStoredTransaction?.blockHeader.blockNo}`
);
const lowerBound = lastStoredTransaction?.blockHeader.blockNo;
const newTransactions = await allTransactionsByAddresses(chainHistoryProvider, {
addresses,
blockRange: { lowerBound }
});
logger.debug(
`chainHistoryProvider returned ${newTransactions.length} transactions`,
lowerBound !== undefined && `since block ${lowerBound}`
);
// Fetching transactions from scratch, nothing else to do here.
if (lowerBound === undefined) {
if (newTransactions.length > 0) {
localTransactions = newTransactions;
store.setAll(newTransactions);
}
return newTransactions;
}
// If no transactions found from that block range, it means the last known block has been rolled back.
if (newTransactions.length === 0) {
localTransactions = revertLastBlock(localTransactions, lowerBound, rollback$, newTransactions, logger);
rollbackOcurred = true;
continue;
}
const localTxsFromSameBlock = getLastTransactionsAtBlock(localTransactions, lowerBound);
const firstSegmentOfNewTransactions = newTransactions.slice(0, localTxsFromSameBlock.length);
// The first segment of new transaction should match exactly (same txs and same order) our last know TXs. Otherwise
// roll them back and re-apply in new order.
const sameTxAndOrder = localTxsFromSameBlock.every(
(tx, index) => tx.id === firstSegmentOfNewTransactions[index].id
);
if (!sameTxAndOrder) {
localTransactions = revertLastBlock(localTransactions, lowerBound, rollback$, newTransactions, logger);
rollbackOcurred = true;
continue;
}
// No rollbacks, if they overlap 100% do nothing, otherwise add the difference.
const areTransactionsSame =
newTransactions.length === localTxsFromSameBlock.length &&
localTxsFromSameBlock.every((tx, index) => tx.id === newTransactions[index].id);
if (!areTransactionsSame) {
// Skip overlapping transactions to avoid duplicates
localTransactions = [...localTransactions, ...newTransactions.slice(localTxsFromSameBlock.length)];
store.setAll(localTransactions);
} else if (rollbackOcurred) {
// This case handles rollbacks without new additions
store.setAll(localTransactions);
}
return localTransactions;
}
},
retryBackoffConfig,
trigger$: tipBlockHeight$
});
export const createAddressTransactionsProvider = (
props: TransactionsTrackerInternalsProps
): TransactionsTrackerInternals => {
const { addresses$, store, logger } = props;
const rollback$ = new Subject<Cardano.HydratedTx>();
const storedTransactions$ = store.getAll().pipe(share());
return {
rollback$: rollback$.asObservable(),
transactionsSource$: concat(
storedTransactions$.pipe(
tap((storedTransactions) =>
logger.debug(`Stored history transactions count: ${storedTransactions?.length || 0}`)
)
),
combineLatest([addresses$, storedTransactions$.pipe(defaultIfEmpty([] as Cardano.HydratedTx[]))]).pipe(
switchMap(([addresses, storedTransactions]) =>
findIntersectionAndUpdateTxStore({
addresses,
localTransactions: [...storedTransactions],
rollback$,
...props
})
)
)
)
};
};
const createHistoricalTransactionsTrackerSubject = (
transactions$: Observable<Cardano.HydratedTx[]>
): TrackerSubject<Cardano.HydratedTx[]> =>
new TrackerSubject(
transactions$.pipe(
map((transactions) =>
sortBy(
transactions,
({ blockHeader: { blockNo } }) => blockNo,
({ index }) => index
)
)
)
);
export const newTransactions$ = <T extends Pick<Cardano.Tx, 'id'>>(transactions$: Observable<T[]>) =>
transactions$.pipe(
take(1),
map((transactions) => transactions.map(({ id }) => id)),
mergeMap((initialTransactionIds) => {
const ignoredTransactionIds: Cardano.TransactionId[] = [...initialTransactionIds];
return transactions$.pipe(
map((transactions) => transactions.filter(({ id }) => !ignoredTransactionIds.includes(id))),
tap((newTransactions) => ignoredTransactionIds.push(...newTransactions.map(({ id }) => id))),
mergeMap((newTransactions) => concat(...newTransactions.map((tx) => of(tx))))
);
})
);
export const createTransactionsTracker = (
{
tip$,
chainHistoryProvider,
addresses$,
newTransactions: { submitting$: newSubmitting$, pending$, signed$: newSigned$, failedToSubmit$ },
retryBackoffConfig,
transactionsHistoryStore: transactionsStore,
inFlightTransactionsStore: newTransactionsStore,
signedTransactionsStore,
logger,
failedFromReemitter$,
onFatalError
}: TransactionsTrackerProps,
{ transactionsSource$: txSource$, rollback$ }: TransactionsTrackerInternals = createAddressTransactionsProvider({
addresses$,
chainHistoryProvider,
logger: contextLogger(logger, 'AddressTransactionsProvider'),
onFatalError,
retryBackoffConfig,
store: transactionsStore,
tipBlockHeight$: distinctBlock(tip$)
})
): TransactionsTracker & Shutdown => {
const submitting$ = newSubmitting$.pipe(
tap((newSubmitting) => logger.debug(`Got new submitting transaction: ${newSubmitting.id}`)),
share()
);
const transactionsSource$ = new TrackerSubject(txSource$);
const historicalTransactions$ = createHistoricalTransactionsTrackerSubject(transactionsSource$).pipe(
tap((transactions) => logger.debug(`History transactions count: ${transactions?.length || 0}`))
);
const [onChainNewTxPhase2Failed$, onChainNewTxSuccess$] = partition(
newTransactions$(historicalTransactions$).pipe(share()),
(tx) => Cardano.util.isPhase2ValidationErrTx(tx)
);
const txOnChain$ = (evt: OutgoingTx): Observable<OutgoingOnChainTx> =>
merge(
historicalTransactions$.pipe(
take(1),
mergeMap((txs) => from(txs))
),
onChainNewTxSuccess$
).pipe(
filter((historyTx) => historyTx.id === evt.id),
take(1),
map((historyTx) => ({ ...evt, slot: historyTx.blockHeader.slot })),
tap(({ slot }) => logger.debug(`Transaction ${evt.id} is on-chain in slot ${slot}`))
);
const submittingOrPreviouslySubmitted$ = newAndStoredMulticast<TxInFlight, Cardano.TransactionId>({
groupByFn: ({ id }) => id,
logStringfn: (transactions) => `Store contains ${transactions?.length} in flight transactions`,
logger,
new$: submitting$,
stored$: newTransactionsStore.get(),
storedFilterfn: ({ submittedAt }) => !!submittedAt
});
const newSignedOrPreviouslySigned$ = newAndStoredMulticast<WitnessedTx, Cardano.TransactionId>({
groupByFn: ({ tx }) => tx.id,
logStringfn: (WitnessedTxs) => `Store contains ${WitnessedTxs?.length} signed transactions`,
logger,
new$: newSigned$,
stored$: signedTransactionsStore.get()
});
const failed$ = new Subject<FailedTx>();
const failedSubscription = submittingOrPreviouslySubmitted$
.pipe(
mergeMap((group$) =>
group$.pipe(
switchMap((tx) => {
const invalidHereafter = tx.body.validityInterval?.invalidHereafter;
return race(
onChainNewTxPhase2Failed$.pipe(
filter((failedTx) => failedTx.id === tx.id),
map((): FailedTx => ({ reason: TransactionFailure.Phase2Validation, ...tx }))
),
rollback$.pipe(
map((rolledBackTx) => rolledBackTx.id),
filter((rolledBackTxId) => tx.body.inputs.some(({ txId }) => txId === rolledBackTxId)),
map(
(rolledBackTxId): FailedTx => ({
error: new Error(
`Invalid inputs due to rolled back tx (${rolledBackTxId}}). Try to rebuild and resubmit.`
),
reason: TransactionFailure.InvalidTransaction,
...tx
})
)
),
failedToSubmit$.pipe(filter((failed) => failed.id === tx.id)),
invalidHereafter
? tip$.pipe(
filter(({ slot }) => slot > invalidHereafter),
map(() => ({ reason: TransactionFailure.Timeout, ...tx }))
)
: NEVER
).pipe(take(1), takeUntil(txOnChain$(tx)));
})
)
),
mergeWith(failedFromReemitter$ || EMPTY),
tap(({ id, reason }) => logger.debug(`Transaction ${id} failed`, reason))
)
.subscribe(failed$);
const txFailed$ = (tx: OutgoingTx) =>
failed$.pipe(
filter((failed) => failed.id === tx.id),
take(1)
);
const txPending$ = (tx: OutgoingTx) =>
pending$.pipe(
filter((pending) => pending.id === tx.id),
withLatestFrom(tip$),
map(([_, { slot }]) => ({ submittedAt: slot, ...tx }))
);
const inFlight$ = new TrackerSubject<TxInFlight[]>(
submittingOrPreviouslySubmitted$.pipe(
mergeMap((group$) =>
group$.pipe(
// Only keep 1 (latest) inner observable per tx id.
switchMap((tx) => {
const done$ = race(txOnChain$(tx), txFailed$(tx)).pipe(
map(() => ({ op: 'remove' as const, tx })),
share()
);
return merge(
of({ op: 'add' as const, tx }),
done$,
tx.submittedAt
? EMPTY
: // NOTE: current implementation might incorrectly update 'submittedAt'
// if transaction was attempted to resubmit and appeared to be already submitted.
// This property currently does not necessarily correspond to
// time when transaction got into a mempool - it works more like 'lastAttemptToSubmitAt',
// which isn't necessarily bad as it might prevent frequent resubmissions in some cases
txPending$(tx).pipe(
map((pendingTx) => ({
op: 'submitted' as const,
tx: pendingTx
})),
takeUntil(done$)
)
);
})
)
),
scan((inFlight, props) => {
const idx = inFlight.findIndex((txInFlight) => txInFlight.id === props.tx.id);
if (props.op === 'add') {
if (idx >= 0) {
return [...inFlight.slice(0, idx), props.tx, ...inFlight.slice(idx + 1)];
}
return [...inFlight, props.tx];
}
if (props.op === 'remove') {
return [...inFlight.slice(0, idx), ...inFlight.slice(idx + 1)];
}
// props.op === 'submitted'
return [...inFlight.slice(0, idx), props.tx, ...inFlight.slice(idx + 1)];
}, [] as TxInFlight[]),
tap((inFlight) => newTransactionsStore.set(inFlight)),
tap((inFlight) => logger.debug(`${inFlight.length} in flight transactions`)),
startWith([])
)
);
const signed$ = new TrackerSubject<WitnessedTx[]>(
merge(
newSignedOrPreviouslySigned$.pipe(
mergeMap((WitnessedTx$) => WitnessedTx$),
map((witnessedTx) => ({ op: 'add' as const, witnessedTx }))
),
inFlight$.pipe(
mergeMap((txs) => txs),
map((tx) => ({ id: tx.id, op: 'remove' as const }))
),
historicalTransactions$.pipe(
map((txs) => ({
inputs: txs.flatMap((tx) => tx.body.inputs.map((inputs) => inputs)),
op: 'check_inputs' as const
}))
),
tip$.pipe(map(({ slot }) => ({ op: 'check_interval' as const, slot })))
).pipe(
scan((signed, action) => {
if (action.op === 'add') {
return [...signed, action.witnessedTx];
}
if (action.op === 'remove') {
return signed.filter(({ tx }) => tx.id !== action.id);
}
if (action.op === 'check_interval') {
return signed.filter(
({
tx: {
body: { validityInterval: { invalidHereafter } = {} }
}
}) => invalidHereafter && invalidHereafter > action.slot
);
}
if (action.op === 'check_inputs') {
return signed.filter(({ tx }) => {
const anyUtxoIsUsed = tx.body.inputs.some((WitnessedTxInput) =>
action.inputs.some((historicalInput) => txInEquals(WitnessedTxInput, historicalInput))
);
return !anyUtxoIsUsed;
});
}
return signed;
}, [] as WitnessedTx[]),
tap((signed) => signedTransactionsStore.set(signed)),
startWith([]),
distinctUntilChanged(signedTxsEquals)
)
);
const onChain$ = new Subject<OutgoingOnChainTx>();
const onChainSubscription = submittingOrPreviouslySubmitted$
.pipe(mergeMap((group$) => group$.pipe(switchMap((tx) => txOnChain$(tx).pipe(takeUntil(txFailed$(tx)))))))
.subscribe(onChain$);
return {
history$: historicalTransactions$,
outgoing: {
failed$,
inFlight$,
onChain$,
pending$,
signed$,
submitting$
},
rollback$,
shutdown: () => {
inFlight$.complete();
onChainSubscription.unsubscribe();
onChain$.complete();
failedSubscription.unsubscribe();
failed$.complete();
logger.debug('Shutdown');
}
};
};
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