@nori-zk/mina-token-bridge/build/rx/state.js

Nori ethereum state settelment and nETH token bridge zkApp

import { combineLatest, distinctUntilChanged, interval, map, switchMap, } from 'rxjs';
export const getBridgeStateWithTimings$ = (bridgeStateTopic$, bridgeTimingsTopic$) => 
// Ensure both topics have fired and merge them into a single observable
combineLatest([bridgeStateTopic$, bridgeTimingsTopic$]).pipe(
// Supress bridgeTimingsTopic$ changes until bridgeStateTopic$ changes.
distinctUntilChanged((prev, curr) => JSON.stringify(prev[0]) === JSON.stringify(curr[0])), 
// Calculate the time remaining
map(([bridgeState, bridgeTimings]) => {
    // FIXME this mixed casing is awful.
    const { stage_name, elapsed_sec } = bridgeState;
    const expectedDuration = bridgeTimings.extension[stage_name];
    let timeRemaining = expectedDuration - elapsed_sec;
    return { bridgeState, timeRemaining };
}), 
// Emit bridgeState with time_remaining_sec and elapsed_sec countdown.
switchMap(({ bridgeState, timeRemaining }) => {
    return interval(1000).pipe(map((elapsedSeconds) => ({
        ...bridgeState,
        time_remaining_sec: timeRemaining - elapsedSeconds,
        elapsed_sec: elapsedSeconds,
    })));
}));
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