pagespeed-quest/build/playback.js

A framework for efficient web front-end speed improvement

import { startPlayback } from 'rust-http-playback-proxy';
import { InventoryRepository } from './inventory.js';
export class PlaybackProxy {
    rustProxy;
    inventoryRepository;
    entryUrl;
    deviceType;
    requestedPort;
    fullThrottle;
    dependency;
    constructor(options, dependency) {
        options ||= {};
        this.dependency = dependency || {};
        // Inventory repository
        this.inventoryRepository = options.inventoryRepository ?? new InventoryRepository(undefined, this.dependency);
        // Port
        this.requestedPort = options.port;
        // Full throttle
        this.fullThrottle = options.fullThrottle;
    }
    async start() {
        this.dependency.logger?.info(`Starting playback proxy...`);
        // Load inventory to get entryUrl and deviceType
        const inventory = await this.inventoryRepository.loadInventory();
        this.entryUrl = inventory.entryUrl;
        this.deviceType = inventory.deviceType;
        this.rustProxy = await startPlayback({
            inventoryDir: this.inventoryRepository.dirPath,
            port: this.requestedPort || 0,
            fullThrottle: this.fullThrottle,
        });
        this.dependency.logger?.info(`Playback proxy started on port ${this.rustProxy.port}`);
    }
    get port() {
        if (!this.rustProxy)
            throw new Error('Proxy not started');
        return this.rustProxy.port;
    }
    get inventoryDirPath() {
        return this.inventoryRepository.dirPath;
    }
    async stop() {
        if (this.rustProxy) {
            this.dependency.logger?.info(`Stopping playback proxy...`);
            await this.rustProxy.stop();
            this.dependency.logger?.info(`Playback proxy stopped`);
        }
    }
}
export async function withPlaybackProxy(options, dependency, cb) {
    const proxy = new PlaybackProxy(options, dependency);
    await proxy.start();
    try {
        await cb(proxy);
    }
    finally {
        await proxy.stop();
    }
}
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