hyperswarm-web/src/index.ts

196 lines
4.6 KiB
TypeScript
Raw Normal View History

2022-06-27 22:21:31 +00:00
// @ts-ignore
2022-07-20 05:55:44 +00:00
import DhtNode from "@hyperswarm/dht-relay";
2022-06-27 22:21:31 +00:00
// @ts-ignore
import Stream from "@hyperswarm/dht-relay/ws";
// @ts-ignore
import createRoundRobin from "@derhuerst/round-robin-scheduler";
2022-07-20 05:55:44 +00:00
// @ts-ignore
2022-07-27 01:39:32 +00:00
import { Buffer } from "buffer";
2022-07-20 05:55:44 +00:00
// @ts-ignore
// @ts-ignore
2022-07-27 01:39:32 +00:00
import { blake2b, errTuple } from "libskynet";
2022-07-20 05:55:44 +00:00
// @ts-ignore
2022-07-27 01:39:32 +00:00
import { registryRead } from "libkmodule";
2022-07-20 05:55:44 +00:00
2022-07-27 01:39:32 +00:00
import { unpack } from "msgpackr";
import randomNumber from "random-number-csprng";
2022-06-27 22:21:31 +00:00
2022-07-20 05:55:44 +00:00
const REGISTRY_DHT_KEY = "lumeweb-dht-node";
2022-06-27 22:21:31 +00:00
export default class DHT {
2022-07-27 01:39:32 +00:00
private _options: any;
private _relays: Map<string, string> = new Map();
private _activeRelays: Map<string, typeof DhtNode> = new Map();
private _maxConnections = 10;
private _inited = false;
constructor(opts = {}) {
// @ts-ignore
opts.custodial = false;
this._options = opts;
}
ready(): Promise<void> {
if (this._inited) {
return Promise.resolve();
2022-07-20 05:55:44 +00:00
}
2022-06-27 22:21:31 +00:00
2022-07-27 01:39:32 +00:00
this._inited = true;
return this.fillConnections();
}
2022-07-27 01:39:32 +00:00
get relays(): string[] {
return [...this._relays.keys()];
}
2022-06-27 22:21:31 +00:00
2022-07-27 01:39:32 +00:00
public async addRelay(pubkey: string): Promise<boolean> {
let entry: errTuple = await registryRead(
Uint8Array.from(Buffer.from(pubkey, "hex")),
hashDataKey(REGISTRY_DHT_KEY)
);
2022-06-27 22:21:31 +00:00
2022-07-27 01:39:32 +00:00
if (entry[1] || !entry[0]?.exists) {
return false;
}
2022-07-20 05:55:44 +00:00
2022-07-27 01:39:32 +00:00
let host;
2022-06-27 22:21:31 +00:00
2022-07-27 01:39:32 +00:00
try {
host = unpack(entry[0].entryData);
} catch (e) {
return false;
}
2022-07-20 05:55:44 +00:00
2022-07-27 01:39:32 +00:00
const [domain, port] = host.split(":");
2022-07-20 05:55:44 +00:00
2022-07-27 01:39:32 +00:00
if (isNaN(parseInt(port))) {
return false;
2022-06-27 22:21:31 +00:00
}
2022-07-27 01:39:32 +00:00
this._relays.set(pubkey, `wss://${domain}:${port}/`);
2022-07-20 05:55:44 +00:00
2022-07-27 01:39:32 +00:00
if (this._inited) {
await this.fillConnections();
}
2022-07-27 01:39:32 +00:00
return true;
}
2022-07-20 05:55:44 +00:00
2022-07-27 01:39:32 +00:00
public removeRelay(pubkey: string): boolean {
if (!this._relays.has(pubkey)) {
return false;
2022-06-27 22:21:31 +00:00
}
2022-07-27 01:39:32 +00:00
if (this._activeRelays.has(pubkey)) {
this._activeRelays.get(pubkey).destroy();
this._activeRelays.delete(pubkey);
2022-07-20 05:55:44 +00:00
}
2022-06-27 22:21:31 +00:00
2022-07-27 01:39:32 +00:00
this._relays.delete(pubkey);
return true;
}
public clearRelays(): void {
[...this._relays.keys()].forEach(this.removeRelay);
}
private async isServerAvailable(connection: string): Promise<boolean> {
return new Promise<boolean>((resolve) => {
const ws = new WebSocket(connection);
ws.addEventListener("open", () => {
ws.close();
resolve(true);
});
ws.addEventListener("error", () => {
resolve(false);
});
});
}
async connect(pubkey: string, options = {}): Promise<DhtNode> {
if (this._activeRelays.size === 0) {
throw new Error("Failed to find an available relay");
2022-06-27 22:21:31 +00:00
}
2022-07-27 01:39:32 +00:00
const node = this._activeRelays.get(
[...this._activeRelays.keys()][
await randomNumber(0, this._activeRelays.size - 1)
]
);
return node.connect(pubkey, options);
}
private async fillConnections(): Promise<any> {
let available: string[] = [];
const updateAvailable = () => {
available = [...this._relays.keys()].filter(
(x) => ![...this._activeRelays.keys()].includes(x)
);
};
updateAvailable();
2022-07-27 01:39:32 +00:00
let relayPromises = [];
while (
this._activeRelays.size <=
Math.min(this._maxConnections, available.length)
2022-07-27 01:39:32 +00:00
) {
if (0 === available.length) {
break;
}
2022-07-27 03:59:45 +00:00
let relayIndex = 0;
if (available.length > 1) {
relayIndex = await randomNumber(0, available.length - 1);
}
2022-07-27 01:39:32 +00:00
2022-07-27 02:58:24 +00:00
const connection = this._relays.get(available[relayIndex]) as string;
2022-07-27 01:39:32 +00:00
2022-07-27 04:05:28 +00:00
if (!(await this.isServerAvailable(connection))) {
available.splice(relayIndex, 1);
this.removeRelay(available[relayIndex]);
2022-07-27 01:39:32 +00:00
continue;
}
const node = new DhtNode(
2022-07-27 02:56:49 +00:00
new Stream(true, new WebSocket(connection)),
2022-07-27 01:39:32 +00:00
this._options
);
this._activeRelays.set(available[relayIndex], node);
updateAvailable();
2022-07-27 01:39:32 +00:00
relayPromises.push(node.ready());
2022-07-20 05:55:44 +00:00
}
2022-07-27 01:39:32 +00:00
return Promise.allSettled(relayPromises);
}
2022-06-27 22:21:31 +00:00
}
export function hashDataKey(dataKey: string): Uint8Array {
2022-07-27 01:39:32 +00:00
return blake2b(encodeUtf8String(dataKey));
2022-06-27 22:21:31 +00:00
}
function encodeUtf8String(str: string): Uint8Array {
2022-07-27 01:39:32 +00:00
const byteArray = stringToUint8ArrayUtf8(str);
const encoded = new Uint8Array(8 + byteArray.length);
encoded.set(encodeNumber(byteArray.length));
encoded.set(byteArray, 8);
return encoded;
2022-06-27 22:21:31 +00:00
}
function stringToUint8ArrayUtf8(str: string): Uint8Array {
2022-07-27 01:39:32 +00:00
return Uint8Array.from(Buffer.from(str, "utf-8"));
2022-06-27 22:21:31 +00:00
}
function encodeNumber(num: number): Uint8Array {
2022-07-27 01:39:32 +00:00
const encoded = new Uint8Array(8);
for (let index = 0; index < encoded.length; index++) {
encoded[index] = num & 0xff;
num = num >> 8;
}
return encoded;
2022-06-27 22:21:31 +00:00
}