@cloud-copilot/iam-lens/dist/esm/workers/SharedArrayBufferWorkerCache.js

Visibility in IAM in and across AWS accounts

import { MessagePort } from 'worker_threads';
import {} from './SharedArrayBufferMainCache.js';
import { convertArrayBufferToObject, convertObjectToArrayBuffer } from './buffers.js';
//TODO: Add a Prefix to avoid collisions if there are multiple caches
export class SharedArrayBufferWorkerCache {
    constructor(parentPort) {
        this.parentPort = parentPort;
        this.requestPromiseMap = {};
        this.parentPromiseMap = {};
        this.parentPort.on('message', (msg) => {
            if (msg.type === 'cacheHit' || msg.type === 'cacheMiss') {
                const resolver = this.parentPromiseMap[msg.cacheKey];
                if (resolver) {
                    delete this.parentPromiseMap[msg.cacheKey]; // clean up
                    resolver(msg.type === 'cacheHit' ? msg.value : false);
                }
            }
        });
    }
    async withCache(cacheKey, fetcher) {
        if (this.requestPromiseMap[cacheKey]) {
            return this.requestPromiseMap[cacheKey];
        }
        this.requestPromiseMap[cacheKey] = (async () => {
            try {
                const parentPromise = new Promise((resolve) => {
                    this.parentPromiseMap[cacheKey] = resolve;
                    this.parentPort.postMessage({ type: 'getCache', cacheKey });
                });
                const response = await parentPromise;
                if (response === false) {
                    const theValue = await fetcher(); // your async loader
                    const arrayBuffer = convertObjectToArrayBuffer(theValue);
                    this.parentPort.postMessage({ type: 'saveCache', cacheKey, value: arrayBuffer });
                    return theValue;
                }
                return convertArrayBufferToObject(response);
            }
            finally {
                delete this.requestPromiseMap[cacheKey]; // Clean up the queue regardless of success or failure.
            }
        })();
        return this.requestPromiseMap[cacheKey];
    }
}
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