raiden-ts/dist/transfers/epics/expire.js

Raiden Light Client Typescript/Javascript SDK

import { timer } from 'rxjs';
import { exhaustMap, filter, groupBy, mapTo, mergeMap, mergeMapTo, mergeWith, pluck, startWith, takeUntil, withLatestFrom, } from 'rxjs/operators';
import { ErrorCodes, RaidenError } from '../../utils/error';
import { completeWith } from '../../utils/rx';
import { transfer, transferExpire } from '../actions';
import { Direction } from '../state';
/**
 * Process newBlocks, emits transferExpire.request (request to compose&sign LockExpired for a
 * transfer) if pending transfer's lock expired and transfer didn't unlock (succeed) in time
 * Also, emits transfer.failure, to notify users that a transfer has failed (although it'll only be
 * considered as completed with fail once the transferExpireProcessed arrives).
 *
 * @param action$ - Observable of newBlock|transferExpire.success|transferExpire.failure actions
 * @param state$ - Observable of RaidenStates
 * @param deps - Epics dependencies
 * @param deps.config$ - Config observable
 * @returns Observable of transferExpire.request|transfer.failure actions
 */
export function transferAutoExpireEpic({}, state$, { config$ }) {
    const transferIsGone$ = ({ key }) => state$.pipe(filter(({ transfers }) => !(key in transfers)));
    return state$.pipe(pluck('transfers'), mergeMap((transfers) => Object.values(transfers)), filter(({ direction }) => direction === Direction.SENT), groupBy(({ _id }) => _id, { duration: transferIsGone$ }), mergeMap((grouped$) => grouped$.pipe(withLatestFrom(config$), exhaustMap(([{ expiration, transfer: locked }, { httpTimeout }]) => {
        const meta = { secrethash: locked.lock.secrethash, direction: Direction.SENT };
        return timer(new Date((expiration + 1) * 1e3)).pipe(mergeMapTo(timer(httpTimeout).pipe(mapTo(transferExpire.request(undefined, meta)), startWith(transfer.failure(new RaidenError(ErrorCodes.XFER_EXPIRED, { expiration }), meta)))));
    }), takeUntil(grouped$.pipe(filter((t) => !!(t.unlock || t.expired || t.secretRegistered || t.channelClosed)), mergeWith(transferIsGone$(grouped$)))), completeWith(state$))));
}
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