nostr package part 1
This commit is contained in:
ennmichael
458
packages/nostr/src/legacy/Connection.ts
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458
packages/nostr/src/legacy/Connection.ts
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@ -0,0 +1,458 @@
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import * as secp from "@noble/secp256k1";
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import { v4 as uuid } from "uuid";
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import { Subscriptions } from "./Subscriptions";
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import { default as NEvent } from "./Event";
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import { DefaultConnectTimeout } from "./Const";
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import { ConnectionStats } from "./ConnectionStats";
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import { RawEvent, RawReqFilter, TaggedRawEvent, u256 } from "./index";
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import { RelayInfo } from "./RelayInfo";
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import Nips from "./Nips";
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import { System } from "./System";
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import { unwrap } from "./Util";
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export type CustomHook = (state: Readonly<StateSnapshot>) => void;
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/**
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* Relay settings
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*/
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export type RelaySettings = {
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read: boolean;
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write: boolean;
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};
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/**
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* Snapshot of connection stats
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*/
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export type StateSnapshot = {
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connected: boolean;
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disconnects: number;
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avgLatency: number;
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events: {
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received: number;
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send: number;
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};
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info?: RelayInfo;
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id: string;
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};
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export default class Connection {
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Id: string;
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Address: string;
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Socket: WebSocket | null;
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Pending: Array<RawReqFilter>;
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Subscriptions: Map<string, Subscriptions>;
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Settings: RelaySettings;
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Info?: RelayInfo;
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ConnectTimeout: number;
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Stats: ConnectionStats;
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StateHooks: Map<string, CustomHook>;
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HasStateChange: boolean;
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CurrentState: StateSnapshot;
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LastState: Readonly<StateSnapshot>;
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IsClosed: boolean;
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ReconnectTimer: ReturnType<typeof setTimeout> | null;
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EventsCallback: Map<u256, (msg: boolean[]) => void>;
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AwaitingAuth: Map<string, boolean>;
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Authed: boolean;
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constructor(addr: string, options: RelaySettings) {
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this.Id = uuid();
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this.Address = addr;
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this.Socket = null;
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this.Pending = [];
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this.Subscriptions = new Map();
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this.Settings = options;
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this.ConnectTimeout = DefaultConnectTimeout;
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this.Stats = new ConnectionStats();
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this.StateHooks = new Map();
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this.HasStateChange = true;
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this.CurrentState = {
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connected: false,
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disconnects: 0,
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avgLatency: 0,
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events: {
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received: 0,
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send: 0,
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},
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} as StateSnapshot;
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this.LastState = Object.freeze({ ...this.CurrentState });
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this.IsClosed = false;
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this.ReconnectTimer = null;
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this.EventsCallback = new Map();
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this.AwaitingAuth = new Map();
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this.Authed = false;
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this.Connect();
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}
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async Connect() {
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try {
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if (this.Info === undefined) {
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const u = new URL(this.Address);
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const rsp = await fetch(`https://${u.host}`, {
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headers: {
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accept: "application/nostr+json",
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},
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});
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if (rsp.ok) {
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const data = await rsp.json();
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for (const [k, v] of Object.entries(data)) {
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if (v === "unset" || v === "") {
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data[k] = undefined;
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}
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}
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this.Info = data;
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}
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}
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} catch (e) {
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console.warn("Could not load relay information", e);
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}
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if (this.IsClosed) {
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this._UpdateState();
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return;
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}
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this.IsClosed = false;
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this.Socket = new WebSocket(this.Address);
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this.Socket.onopen = () => this.OnOpen();
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this.Socket.onmessage = (e) => this.OnMessage(e);
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this.Socket.onerror = (e) => this.OnError(e);
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this.Socket.onclose = (e) => this.OnClose(e);
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}
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Close() {
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this.IsClosed = true;
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if (this.ReconnectTimer !== null) {
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clearTimeout(this.ReconnectTimer);
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this.ReconnectTimer = null;
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}
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this.Socket?.close();
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this._UpdateState();
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}
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OnOpen() {
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this.ConnectTimeout = DefaultConnectTimeout;
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this._InitSubscriptions();
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console.log(`[${this.Address}] Open!`);
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}
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OnClose(e: CloseEvent) {
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if (!this.IsClosed) {
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this.ConnectTimeout = this.ConnectTimeout * 2;
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console.log(
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`[${this.Address}] Closed (${e.reason}), trying again in ${(
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this.ConnectTimeout / 1000
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)
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.toFixed(0)
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.toLocaleString()} sec`
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);
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this.ReconnectTimer = setTimeout(() => {
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this.Connect();
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}, this.ConnectTimeout);
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this.Stats.Disconnects++;
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} else {
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console.log(`[${this.Address}] Closed!`);
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this.ReconnectTimer = null;
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}
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this._UpdateState();
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}
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OnMessage(e: MessageEvent) {
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if (e.data.length > 0) {
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const msg = JSON.parse(e.data);
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const tag = msg[0];
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switch (tag) {
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case "AUTH": {
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this._OnAuthAsync(msg[1]);
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this.Stats.EventsReceived++;
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this._UpdateState();
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break;
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}
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case "EVENT": {
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this._OnEvent(msg[1], msg[2]);
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this.Stats.EventsReceived++;
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this._UpdateState();
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break;
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}
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case "EOSE": {
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this._OnEnd(msg[1]);
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break;
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}
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case "OK": {
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// feedback to broadcast call
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console.debug(`${this.Address} OK: `, msg);
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const id = msg[1];
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if (this.EventsCallback.has(id)) {
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const cb = unwrap(this.EventsCallback.get(id));
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this.EventsCallback.delete(id);
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cb(msg);
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}
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break;
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}
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case "NOTICE": {
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console.warn(`[${this.Address}] NOTICE: ${msg[1]}`);
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break;
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}
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default: {
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console.warn(`Unknown tag: ${tag}`);
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break;
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}
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}
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}
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}
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OnError(e: Event) {
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console.error(e);
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this._UpdateState();
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}
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/**
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* Send event on this connection
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*/
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SendEvent(e: NEvent) {
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if (!this.Settings.write) {
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return;
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}
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const req = ["EVENT", e.ToObject()];
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this._SendJson(req);
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this.Stats.EventsSent++;
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this._UpdateState();
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}
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/**
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* Send event on this connection and wait for OK response
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*/
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async SendAsync(e: NEvent, timeout = 5000) {
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return new Promise<void>((resolve) => {
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if (!this.Settings.write) {
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resolve();
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return;
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}
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const t = setTimeout(() => {
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resolve();
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}, timeout);
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this.EventsCallback.set(e.Id, () => {
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clearTimeout(t);
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resolve();
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});
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const req = ["EVENT", e.ToObject()];
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this._SendJson(req);
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this.Stats.EventsSent++;
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this._UpdateState();
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});
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}
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/**
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* Subscribe to data from this connection
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*/
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AddSubscription(sub: Subscriptions) {
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if (!this.Settings.read) {
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return;
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}
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// check relay supports search
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if (sub.Search && !this.SupportsNip(Nips.Search)) {
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return;
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}
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if (this.Subscriptions.has(sub.Id)) {
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return;
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}
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this._SendSubscription(sub);
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this.Subscriptions.set(sub.Id, sub);
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}
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/**
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* Remove a subscription
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*/
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RemoveSubscription(subId: string) {
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if (this.Subscriptions.has(subId)) {
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const req = ["CLOSE", subId];
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this._SendJson(req);
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this.Subscriptions.delete(subId);
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return true;
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}
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return false;
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}
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/**
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* Hook status for connection
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*/
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StatusHook(fnHook: CustomHook) {
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const id = uuid();
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this.StateHooks.set(id, fnHook);
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return () => {
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this.StateHooks.delete(id);
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};
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}
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/**
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* Returns the current state of this connection
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*/
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GetState() {
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if (this.HasStateChange) {
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this.LastState = Object.freeze({ ...this.CurrentState });
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this.HasStateChange = false;
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}
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return this.LastState;
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}
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/**
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* Using relay document to determine if this relay supports a feature
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*/
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SupportsNip(n: number) {
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return this.Info?.supported_nips?.some((a) => a === n) ?? false;
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}
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_UpdateState() {
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this.CurrentState.connected = this.Socket?.readyState === WebSocket.OPEN;
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this.CurrentState.events.received = this.Stats.EventsReceived;
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this.CurrentState.events.send = this.Stats.EventsSent;
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this.CurrentState.avgLatency =
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this.Stats.Latency.length > 0
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? this.Stats.Latency.reduce((acc, v) => acc + v, 0) /
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this.Stats.Latency.length
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: 0;
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this.CurrentState.disconnects = this.Stats.Disconnects;
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this.CurrentState.info = this.Info;
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this.CurrentState.id = this.Id;
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this.Stats.Latency = this.Stats.Latency.slice(-20); // trim
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this.HasStateChange = true;
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this._NotifyState();
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}
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_NotifyState() {
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const state = this.GetState();
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for (const [, h] of this.StateHooks) {
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h(state);
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}
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}
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_InitSubscriptions() {
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// send pending
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for (const p of this.Pending) {
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this._SendJson(p);
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}
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this.Pending = [];
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for (const [, s] of this.Subscriptions) {
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this._SendSubscription(s);
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}
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this._UpdateState();
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}
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_SendSubscription(sub: Subscriptions) {
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if (!this.Authed && this.AwaitingAuth.size > 0) {
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this.Pending.push(sub.ToObject());
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return;
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}
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let req = ["REQ", sub.Id, sub.ToObject()];
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if (sub.OrSubs.length > 0) {
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req = [...req, ...sub.OrSubs.map((o) => o.ToObject())];
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}
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sub.Started.set(this.Address, new Date().getTime());
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this._SendJson(req);
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}
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_SendJson(obj: object) {
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if (this.Socket?.readyState !== WebSocket.OPEN) {
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this.Pending.push(obj);
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return;
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}
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const json = JSON.stringify(obj);
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this.Socket.send(json);
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}
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_OnEvent(subId: string, ev: RawEvent) {
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if (this.Subscriptions.has(subId)) {
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//this._VerifySig(ev);
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const tagged: TaggedRawEvent = {
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...ev,
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relays: [this.Address],
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};
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this.Subscriptions.get(subId)?.OnEvent(tagged);
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} else {
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// console.warn(`No subscription for event! ${subId}`);
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// ignored for now, track as "dropped event" with connection stats
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}
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}
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async _OnAuthAsync(challenge: string): Promise<void> {
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const authCleanup = () => {
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this.AwaitingAuth.delete(challenge);
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};
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this.AwaitingAuth.set(challenge, true);
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const authEvent = await System.nip42Auth(challenge, this.Address);
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return new Promise((resolve) => {
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if (!authEvent) {
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authCleanup();
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return Promise.reject("no event");
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}
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const t = setTimeout(() => {
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authCleanup();
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resolve();
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}, 10_000);
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this.EventsCallback.set(authEvent.Id, (msg: boolean[]) => {
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clearTimeout(t);
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authCleanup();
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if (msg.length > 3 && msg[2] === true) {
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this.Authed = true;
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this._InitSubscriptions();
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}
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resolve();
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});
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const req = ["AUTH", authEvent.ToObject()];
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this._SendJson(req);
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this.Stats.EventsSent++;
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this._UpdateState();
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});
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}
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_OnEnd(subId: string) {
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const sub = this.Subscriptions.get(subId);
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if (sub) {
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const now = new Date().getTime();
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const started = sub.Started.get(this.Address);
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sub.Finished.set(this.Address, now);
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if (started) {
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const responseTime = now - started;
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if (responseTime > 10_000) {
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console.warn(
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`[${this.Address}][${subId}] Slow response time ${(
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responseTime / 1000
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).toFixed(1)} seconds`
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);
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}
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this.Stats.Latency.push(responseTime);
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} else {
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console.warn("No started timestamp!");
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}
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sub.OnEnd(this);
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this._UpdateState();
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} else {
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console.warn(`No subscription for end! ${subId}`);
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}
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}
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_VerifySig(ev: RawEvent) {
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const payload = [0, ev.pubkey, ev.created_at, ev.kind, ev.tags, ev.content];
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const payloadData = new TextEncoder().encode(JSON.stringify(payload));
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if (secp.utils.sha256Sync === undefined) {
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throw "Cannot verify event, no sync sha256 method";
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}
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const data = secp.utils.sha256Sync(payloadData);
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const hash = secp.utils.bytesToHex(data);
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if (!secp.schnorr.verifySync(ev.sig, hash, ev.pubkey)) {
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throw "Sig verify failed";
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}
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return ev;
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}
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}
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Block a user