fetch-socks-bw

Fork Notice: This is a fork of the excellent fetch-socks by Kaciras. All credit for the original implementation goes to the original author.

This fork adds bandwidth monitoring capabilities as an experiment using AI-assisted development. While this is experimental "AI slop", I'm publishing it on npm as fetch-socks-bw because I need these features for production use. I chose not to contribute back to the original repository due to the experimental nature and AI-heavy development of these additions.

Socks proxy for Node builtin (also undici) fetch with bandwidth monitoring.

npm install fetch-socks-bw

Usage Examples

Fetch http://example.com through socks5://[::1]:1080.

import { socksDispatcher } from "fetch-socks-bw";

const dispatcher = socksDispatcher({
    type: 5,
    host: "::1",
    port: 1080,

    //userId: "username",
    //password: "password",
});

const response = await fetch("http://example.com", { dispatcher });
console.log(response.status);
console.log(await response.text());

Set the proxy globally.

import { socksDispatcher } from "fetch-socks-bw";

const dispatcher = socksDispatcher({ /* ... */});

global[Symbol.for("undici.globalDispatcher.1")] = dispatcher;

TypeScript example, fetch through proxy chain with two SOCKS proxies.

import { fetch } from "undici";
import { socksDispatcher, SocksProxies } from "fetch-socks-bw";

const proxyConfig: SocksProxies = [{
    type: 5,
    host: "::1",
    port: 1080,
}, {
    type: 5,
    host: "127.0.0.1",
    port: 1081,
}];

const dispatcher = socksDispatcher(proxyConfig, {
    connect: {
        // set some TLS options
        rejectUnauthorized: false,
    },
});

const response = await fetch("https://example.com", { dispatcher });

create a socks connection over HTTP tunnel with socksConnector.

import { Client, Agent } from "undici";
import { socksConnector } from "fetch-socks-bw";

const socksConnect = socksConnector({
    type: 5,
    host: "::1",
    port: 1080,
});

async function connect(options, callback) {
    // First establish a connection to the HTTP proxy server (localhost:80).
    const client = new Client("http://localhost:80");
    const { socket, statusCode } = await client.connect({
        // Tell the server to connect to the next ([::1]:1080)
        path: "[::1]:1080",
    });
    if (statusCode !== 200) {
        callback(new Error("Proxy response !== 200 when HTTP Tunneling"));
    } else {
        // Perform socks handshake on the connection.
        socksConnect({ ...options, httpSocket: socket }, callback);
    }
}

const dispatcher = new Agent({ connect });
const response = await fetch("https://example.com", { dispatcher });

Track bandwidth usage through SOCKS proxies.

import { socksDispatcher, getStatsForDomain, getAllStats, getGlobalStats, resetStats } from "fetch-socks-bw";

const dispatcher = socksDispatcher({
    type: 5,
    host: "::1",
    port: 1080,
}, {
    connect: { enableStats: true }
});

// Make some requests
await fetch("https://example.com", { dispatcher });
await fetch("https://api.github.com/users", { dispatcher });
await fetch("https://example.com/api", { dispatcher });

// Get stats for a specific domain
const exampleStats = getStatsForDomain("example.com");
console.log(exampleStats); // { sent: 442, received: 2048 }

// Get stats for all domains
const allStats = getAllStats();
console.log(allStats);
// {
//   "example.com": { sent: 442, received: 2048 },
//   "api.github.com": { sent: 203, received: 1337 }
// }

// Get global totals
const globalStats = getGlobalStats();
console.log(globalStats); // { sent: 645, received: 3385 }

// Reset all stats
resetStats();
console.log(getAllStats()); // {}

API

socksConnector(proxies, connectOptions?)

Create an Undici connector which establish the connection through socks proxies.

• proxies The proxy server to use or the list of proxy servers to chain. If you pass an empty array it will connect directly.
• connectOptions (optional) The options used to perform directly connect or TLS upgrade, see here
  • enableStats (optional) Enable bandwidth monitoring. Default: false

socksDispatcher(proxies, options?)

Create a Undici Agent with socks connector.

• proxies Same as socksConnector's.
• options (optional) Agent options. The connect property will be used to create socks connector.
  • connect.enableStats (optional) Enable bandwidth monitoring. Default: false

import { socksConnector, socksDispatcher } from "fetch-socks-bw";
import { Agent } from "undici";

const proxy = { type: 5, host: "::1", port: 1080 };
const connect = { /* ... */ };
const agentOptions = { /* ... */ };

socksDispatcher(proxy, { ...agentOptions, connect });

// Is equivalent to
new Agent({ ...agentOptions, connect: socksConnector(proxy, connect) });

getStatsForDomain(domain)

Get byte statistics for a specific domain. Returns { sent: number, received: number } or undefined.

• domain The domain name to get statistics for.

getAllStats()

Get byte statistics for all domains. Returns an object with domain names as keys and { sent, received } as values.

getGlobalStats()

Get total bytes sent and received across all domains. Returns { sent: number, received: number }.

resetStats()

Clear all byte statistics.