hyperswarm-web/src/index.ts

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