@magnetarjs/core/dist/helpers/writeLockHelpers.js

Magnetar core library.

import { isPromise } from 'is-what';
/**
 * await if there's a WriteLock for the document
 */
export async function writeLockPromise(writeLockMap, docIdentifier) {
    const writeLock = writeLockMap.get(docIdentifier);
    if (writeLock && isPromise(writeLock.promise)) {
        await writeLock.promise;
    }
}
/**
 * await if there's a WriteLock for the document, and return the latest version of the doc after this
 */
export async function getDocAfterWritelock(params) {
    const { writeLockMap, lastIncomingDocs, docIdentifier, payload, meta } = params;
    // add to lastIncoming map
    lastIncomingDocs.set(docIdentifier, { payload, meta });
    // check if there's a WriteLock for the document
    await writeLockPromise(writeLockMap, docIdentifier);
    // grab from lastIncoming map
    const lastIncoming = lastIncomingDocs.get(docIdentifier);
    if (!lastIncoming) {
        // do nothing if there is no more last incoming
        // Sometimes multiple added & modified calls can cause this
        return;
    }
    // delete from lastIncoming map
    lastIncomingDocs.delete(docIdentifier);
    return lastIncoming;
}