kernel-swarm/src/index.ts

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// @ts-ignore
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import Hyperswarm from "@lumeweb/hyperswarm-web";
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import type { ActiveQuery } from "libkmodule";
import { addHandler, getSeed, handleMessage } from "libkmodule";
import { handlePresentSeed as handlePresentSeedModule } from "libkmodule/dist/seed.js";
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import type { Buffer } from "buffer";
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import * as ed from "@noble/ed25519";
import b4a from "b4a";
import { pubKeyToIpv6 } from "./addr.js";
import { EventEmitter2 as EventEmitter } from "eventemitter2";
import { logErr } from "libkmodule/dist";
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const MAX_PEER_LISTENERS = 20;
interface SwarmConnection {
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swarm: number;
conn: any;
}
interface SwarmEvents {
swarm: number;
events: EventEmitter;
}
const connections = new Map<number, SwarmConnection>();
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const swarmInstances = new Map<number, Hyperswarm>();
const swarmEvents = new Map<number, SwarmEvents>();
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let defaultSwarm: Hyperswarm;
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let moduleReadyResolve: Function;
let moduleReady: Promise<void> = new Promise((resolve) => {
moduleReadyResolve = resolve;
});
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onmessage = handleMessage;
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function idFactory(start = 1) {
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let id = start;
return function nextId() {
const nextId = id;
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id += 1;
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return nextId;
};
}
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const getSwarmId = idFactory();
const getSocketId = idFactory();
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addHandler("presentSeed", handlePresentSeed);
addHandler("join", handleJoin);
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addHandler("getPeerByPubkey", handleGetPeerByPubkey);
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addHandler("addRelay", handleAddRelay);
addHandler("removeRelay", handleRemoveRelay);
addHandler("clearRelays", handleClearRelays);
addHandler("getRelays", handleGetRelays);
addHandler("init", handleInit);
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addHandler("ready", handleReady);
addHandler("listenConnections", handleListenConnections, {
receiveUpdates: true,
});
addHandler("socketGetInfo", handleGetSocketInfo);
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addHandler("socketExists", handleSocketExists);
addHandler("socketListenEvent", handleSocketListenEvent, {
receiveUpdates: true,
});
addHandler("socketWrite", handleWriteSocketEvent);
addHandler("socketClose", handleCloseSocketEvent);
async function handlePresentSeed(aq: ActiveQuery) {
const pubkey = await ed.getPublicKey(aq.callerInput.rootKey);
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handlePresentSeedModule({
callerInput: {
seed: {
publicKey: await ed.getPublicKey(aq.callerInput.rootKey),
secretKey: b4a.concat([aq.callerInput.rootKey, pubkey]),
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},
},
} as ActiveQuery);
if (!defaultSwarm) {
defaultSwarm = swarmInstances.get(await createSwarm()) as Hyperswarm;
}
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moduleReadyResolve();
}
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async function createSwarm(): Promise<number> {
const swarmInstance = new Hyperswarm({ keyPair: await getSeed() });
const id = getSwarmId();
swarmInstances.set(id, swarmInstance);
swarmInstance.onSelf("init", () => {
const swarmInstanceEvents = new EventEmitter();
swarmInstanceEvents.setMaxListeners(MAX_PEER_LISTENERS);
swarmEvents.set(id, { swarm: id, events: swarmInstanceEvents });
swarmInstance.on("connection", (peer: any) => {
const socketId = getSocketId();
connections.set(socketId, {
swarm: id,
conn: peer,
});
peer.once("close", () => {
connections.delete(socketId);
});
swarmInstanceEvents.emit("connection", peer);
});
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});
swarmInstance.onSelf("close", (...args) => {
swarmEvents.get(id)?.events.emit("close", ...args);
swarmEvents.get(id)?.events.removeAllListeners();
swarmEvents.delete(id);
});
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return id;
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}
function handleSocketListenEvent(aq: ActiveQuery) {
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const { event = null } = aq.callerInput;
const socket = validateConnection(aq);
if (!socket) {
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return;
}
if (!event) {
aq.reject("Invalid event");
return;
}
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let responded = false;
const respond = () => {
if (responded) {
return;
}
responded = true;
aq.respond();
};
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const cb = (data: Buffer) => {
aq.sendUpdate(data);
};
socket.on(event, cb);
socket.once("close", () => {
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socket.off(event, cb);
respond();
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});
aq.setReceiveUpdate?.(() => {
socket.off(event, cb);
respond();
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});
}
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async function handleSocketExists(aq: ActiveQuery) {
const { id = null } = aq.callerInput;
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aq.respond(connections.has(Number(id)));
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}
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function handleCloseSocketEvent(aq: ActiveQuery) {
const socket = validateConnection(aq);
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if (!socket) {
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return;
}
socket.end();
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aq.respond();
}
function handleWriteSocketEvent(aq: ActiveQuery) {
const socket = validateConnection(aq);
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if (!socket) {
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return;
}
const { message = null } = aq.callerInput;
if (!message) {
aq.reject("empty message");
return false;
}
socket.write(message);
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aq.respond();
}
function validateConnection(aq: ActiveQuery): any | boolean {
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const { id = null } = aq.callerInput;
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if (!id || !connections.has(id)) {
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aq.reject("Invalid connection id");
return false;
}
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return connections.get(id)?.conn;
}
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async function getSwarm(aq: ActiveQuery): Promise<Hyperswarm> {
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await moduleReady;
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let swarm;
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if ("callerInput" in aq && aq.callerInput) {
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swarm = aq.callerInput.swarm ?? null;
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if (swarm && !swarmInstances.has(swarm)) {
const error = "Invalid swarm id";
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aq.reject(error);
throw new Error(error);
}
}
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if (!swarm) {
return defaultSwarm;
}
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return swarmInstances.get(swarm) as Hyperswarm;
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}
async function handleAddRelay(aq: ActiveQuery) {
const { pubkey = null } = aq.callerInput;
if (!pubkey) {
aq.reject("invalid pubkey");
return;
}
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const swarm = await getSwarm(aq);
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aq.respond(await swarm.addRelay(pubkey));
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}
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async function handleRemoveRelay(aq: ActiveQuery) {
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const { pubkey = null } = aq.callerInput;
if (!pubkey) {
aq.reject("invalid pubkey");
return;
}
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const swarm = await getSwarm(aq);
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aq.respond(swarm.removeRelay(pubkey));
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}
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async function handleClearRelays(aq: ActiveQuery) {
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const swarm = await getSwarm(aq);
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swarm.clearRelays();
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aq.respond();
}
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async function handleGetRelays(aq: ActiveQuery) {
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aq.respond(await (await getSwarm(aq)).relays);
}
async function handleJoin(aq: ActiveQuery) {
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const { topic = null } = aq.callerInput;
const swarm = await getSwarm(aq);
if (!topic) {
aq.reject("invalid topic");
return;
}
if (!b4a.isBuffer(topic)) {
aq.reject("topic must be a buffer");
return;
}
// @ts-ignore
swarm.join(topic, { server: false });
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aq.respond();
}
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async function handleGetPeerByPubkey(aq: ActiveQuery) {
const { pubkey = null } = aq.callerInput;
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const swarm = await getSwarm(aq);
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if (!pubkey) {
aq.reject("invalid topic");
return;
}
if (!b4a.isBuffer(pubkey)) {
aq.reject("pubkey must be a buffer");
return;
}
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// @ts-ignore
if (!swarm._allConnections.has(pubkey)) {
aq.reject("peer does not exist");
return;
}
// @ts-ignore
const peer = swarm._allConnections.get(pubkey);
aq.respond(getSwarmToSocketConnectionId(peer));
}
async function handleInit(aq: ActiveQuery) {
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const swarm = await getSwarm(aq);
try {
await swarm.init();
} catch (e) {
aq.reject((e as Error).message);
return;
}
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aq.respond();
}
async function handleReady(aq: ActiveQuery) {
const swarm = await getSwarm(aq);
if (swarm.activeRelay && swarm.ready) {
aq.respond();
return;
}
swarm.once("ready", () => {
aq.respond();
});
}
async function handleListenConnections(aq: ActiveQuery) {
const swarm = await getSwarm(aq);
const swarmId = getSwarmToSwarmId(swarm);
const listener = (peer: any) => {
aq.sendUpdate(getSwarmToSocketConnectionId(peer));
};
const swarmEvent = swarmEvents.get(swarmId as number)?.events;
if (!swarmEvent) {
logErr("swarm event object is missing");
}
swarmEvent?.on("connection", listener);
aq.setReceiveUpdate?.(() => {
swarmEvent?.off("connection", listener);
aq.respond();
});
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for (const conn of connections) {
if (conn[1].swarm === swarmId) {
listener(conn[1].conn);
}
}
const closeCb = () => {
swarmEvent?.off("connection", listener);
swarmEvent?.emit("close");
aq.respond();
};
const hookClose = () => {
swarmEvent?.once("close", closeCb);
};
if (swarm.activeRelay) {
hookClose();
return;
}
swarm.onceSelf("ready", hookClose);
}
async function handleGetSocketInfo(aq: ActiveQuery) {
const socket = validateConnection(aq);
if (!socket) {
return;
}
aq.respond({
remotePublicKey: socket.remotePublicKey,
publicKey: socket.publicKey,
rawStream: {
remoteHost: pubKeyToIpv6(socket.remotePublicKey),
remotePort: 0,
remoteFamily: "IPv6",
},
});
}
function getSwarmToSocketConnectionId(socket: any) {
for (const conn of connections) {
if (conn[1].conn === socket) {
return conn[0];
}
}
return false;
}
function getSwarmToSwarmId(swarm: any) {
for (const swarmInstance of swarmInstances) {
if (swarmInstance[1] === swarm) {
return swarmInstance[0];
}
}
return false;
}