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TransactionsTracker.ts
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TransactionsTracker.ts
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import { Cardano, WalletProvider } from '@cardano-sdk/core';
import {
DirectionalTransaction,
FailedTx,
TransactionDirection,
TransactionFailure,
TransactionsTracker
} from './types';
import {
EMPTY,
Observable,
Subject,
concat,
distinctUntilChanged,
filter,
map,
merge,
mergeMap,
of,
race,
scan,
startWith,
switchMap,
take,
takeUntil,
tap
} from 'rxjs';
import { RetryBackoffConfig } from 'backoff-rxjs';
import { TrackerSubject } from './util/TrackerSubject';
import { coldObservableProvider, distinctBlock, transactionsEquals } from './util';
import { sortBy } from 'lodash-es';
export interface TransactionsTrackerProps {
walletProvider: WalletProvider;
addresses$: Observable<Cardano.Address[]>;
tip$: Observable<Cardano.Tip>;
retryBackoffConfig: RetryBackoffConfig;
newTransactions: {
submitting$: Observable<Cardano.NewTxAlonzo>;
pending$: Observable<Cardano.NewTxAlonzo>;
failedToSubmit$: Observable<FailedTx>;
};
}
export interface TransactionsTrackerInternals {
transactionsSource$?: TrackerSubject<DirectionalTransaction[]>;
}
export const createAddressTransactionsProvider = (
walletProvider: WalletProvider,
addresses$: Observable<Cardano.Address[]>,
retryBackoffConfig: RetryBackoffConfig,
tipBlockHeight$: Observable<number>
): Observable<DirectionalTransaction[]> => {
const isMyAddress =
(addresses: Cardano.Address[]) =>
({ address }: { address: Cardano.Address }) =>
addresses.includes(address);
return addresses$.pipe(
switchMap((addresses) =>
coldObservableProvider(
() => walletProvider.queryTransactionsByAddresses(addresses),
retryBackoffConfig,
tipBlockHeight$,
transactionsEquals
).pipe(
map((transactions) =>
sortBy(
transactions,
({ blockHeader: { blockHeight } }) => blockHeight,
({ index }) => index
).map((tx) => {
const direction = tx.body.inputs.some(isMyAddress(addresses))
? TransactionDirection.Outgoing
: TransactionDirection.Incoming;
return { direction, tx };
})
)
)
)
);
};
const newTransactions$ = (transactions$: Observable<Cardano.TxAlonzo[]>) =>
transactions$.pipe(
take(1),
map((transactions) => transactions.map(({ id }) => id)),
mergeMap((initialTransactionIds) => {
const ignoredTransactionIds: Cardano.TransactionId[] = [...initialTransactionIds];
return transactions$.pipe(
map((transactions) => transactions.filter(({ id }) => !ignoredTransactionIds.includes(id))),
tap((newTransactions) => ignoredTransactionIds.push(...newTransactions.map(({ id }) => id))),
mergeMap((newTransactions) => concat(...newTransactions.map((tx) => of(tx))))
);
})
);
export const createTransactionsTracker = (
{
tip$,
walletProvider,
addresses$,
newTransactions: { submitting$, pending$, failedToSubmit$ },
retryBackoffConfig
}: TransactionsTrackerProps,
{
transactionsSource$ = new TrackerSubject(
createAddressTransactionsProvider(walletProvider, addresses$, retryBackoffConfig, distinctBlock(tip$))
)
}: TransactionsTrackerInternals = {}
): TransactionsTracker => {
const providerTransactionsByDirection$ = (direction: TransactionDirection) =>
transactionsSource$.pipe(
map((transactions) => transactions.filter((tx) => tx.direction === direction).map(({ tx }) => tx)),
distinctUntilChanged(transactionsEquals)
);
const incomingTransactionHistory$ = new TrackerSubject<Cardano.TxAlonzo[]>(
providerTransactionsByDirection$(TransactionDirection.Incoming)
);
const outgoingTransactionHistory$ = new TrackerSubject<Cardano.TxAlonzo[]>(
providerTransactionsByDirection$(TransactionDirection.Outgoing)
);
const txConfirmed$ = (tx: Cardano.NewTxAlonzo) =>
newTransactions$(outgoingTransactionHistory$).pipe(
filter((historyTx) => historyTx.id === tx.id),
take(1),
map(() => tx)
);
const failed$ = new Subject<FailedTx>();
const failedSubscription = submitting$
.pipe(
mergeMap((tx) => {
const invalidHereafter = tx.body.validityInterval.invalidHereafter;
return race(
failedToSubmit$.pipe(
filter((failed) => failed.tx === tx),
take(1)
),
invalidHereafter
? tip$.pipe(
filter(({ slot }) => slot > invalidHereafter),
map(() => ({ reason: TransactionFailure.Timeout, tx })),
take(1)
)
: EMPTY
).pipe(takeUntil(txConfirmed$(tx)));
})
)
.subscribe(failed$);
const txFailed$ = (tx: Cardano.NewTxAlonzo) =>
failed$.pipe(
filter((failed) => failed.tx === tx),
take(1)
);
const inFlight$ = new TrackerSubject<Cardano.NewTxAlonzo[]>(
submitting$.pipe(
mergeMap((tx) =>
merge(
of({ op: 'add' as const, tx }),
race(txConfirmed$(tx), txFailed$(tx)).pipe(map(() => ({ op: 'remove' as const, tx })))
)
),
scan((inFlight, { op, tx }) => {
if (op === 'add') {
return [...inFlight, tx];
}
const idx = inFlight.indexOf(tx);
return [...inFlight.splice(0, idx), ...inFlight.splice(idx + 1)];
}, [] as Cardano.NewTxAlonzo[]),
startWith([])
)
);
const confirmed$ = new Subject<Cardano.NewTxAlonzo>();
const confirmedSubscription = submitting$
.pipe(mergeMap((tx) => txConfirmed$(tx).pipe(takeUntil(txFailed$(tx)))))
.subscribe(confirmed$);
return {
history: {
all$: transactionsSource$,
incoming$: incomingTransactionHistory$,
outgoing$: outgoingTransactionHistory$
},
incoming$: newTransactions$(incomingTransactionHistory$),
outgoing: {
confirmed$,
failed$,
inFlight$,
pending$,
submitting$
},
shutdown: () => {
transactionsSource$.complete();
inFlight$.complete();
confirmedSubscription.unsubscribe();
confirmed$.complete();
failedSubscription.unsubscribe();
failed$.complete();
}
};
};