pagespeed-quest
Version:
A framework for efficient web front-end speed improvement
96 lines • 7.75 kB
JavaScript
import Crypto from 'crypto';
import Fsp from 'fs/promises';
import Http from 'http';
import Https from 'https';
import Os from 'os';
import Path from 'path';
import GetPort from 'get-port';
import HttpMitmProxy from 'http-mitm-proxy';
import { InventoryRepository } from './inventory.js';
import { ThrottlingTransform } from './throttling.js';
export class Proxy {
proxyOptions;
proxy;
inventoryRepository;
throttle;
throttlingRetryIntervalMs;
entryUrl;
deviceType;
dependency;
constructor(options, dependency) {
options ||= {};
this.dependency = dependency || {};
// Proxy
this.proxyOptions = options;
this.proxy = HttpMitmProxy();
// Inventory repository
this.inventoryRepository = options.inventoryRepository ?? new InventoryRepository(undefined, this.dependency);
// Throttle
if (options.throttle)
this.throttle = options.throttle;
this.throttlingRetryIntervalMs = options.throttlingRetryIntervalMs || 10;
// Entry URL
this.entryUrl = options.entryUrl;
// Device type
this.deviceType = options.deviceType;
}
static contextRequest(ctx) {
if (!ctx.clientToProxyRequest.headers.host)
throw new Error('ctx.clientToProxyRequest.headers.host is empty');
const url = [
ctx.isSSL ? 'https://' : 'http://',
ctx.clientToProxyRequest.headers.host,
ctx.clientToProxyRequest.url,
].join('');
const method = (ctx.clientToProxyRequest.method || 'get').toLowerCase();
return {
method,
url,
};
}
createThrottlingTransform() {
if (this.throttle) {
return new ThrottlingTransform(this.throttle, this.throttlingRetryIntervalMs);
}
}
async start() {
if (this.throttle)
this.throttle.start();
const sslCaDir = this.proxyOptions.sslCaDir || process.env.SSL_CA_DIR || Path.join(Os.homedir(), '.pagespeed-quest/ca');
const port = Number(this.proxyOptions.port || process.env.PORT || (await GetPort()));
const options = {
port,
sslCaDir,
httpAgent: new Http.Agent({
keepAlive: true,
}),
httpsAgent: new Https.Agent({
keepAlive: true,
secureOptions: Crypto.constants.SSL_OP_LEGACY_SERVER_CONNECT,
}),
};
await this.setup();
await Fsp.mkdir(options.sslCaDir, { recursive: true });
await new Promise((resolve, reject) => this.proxy.listen(options, (error) => (error ? reject(error) : resolve())));
this.dependency.logger?.info(`Proxy started to listening on port ${this.port}`);
}
get port() {
return this.proxy.httpPort;
}
get inventoryDirPath() {
return this.inventoryRepository.dirPath;
}
async stop() {
this.proxy.close();
await this.shutdown();
if (this.throttle)
this.throttle.stop();
this.dependency.logger?.info(`Proxy stopped`);
}
}
export async function withProxy(proxy, fn) {
await proxy.start();
await fn(proxy);
await proxy.stop();
}
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