chore: rename nostr dir
This commit is contained in:
320
src/Nostr/Connection.ts
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320
src/Nostr/Connection.ts
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@ -0,0 +1,320 @@
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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 "Nostr/Subscriptions";
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import { default as NEvent } from "Nostr/Event";
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import { DefaultConnectTimeout } from "Const";
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import { ConnectionStats } from "Nostr/ConnectionStats";
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import { RawEvent, TaggedRawEvent } from "Nostr";
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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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};
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export default class Connection {
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Address: string;
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Socket: WebSocket | null;
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Pending: Subscriptions[];
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Subscriptions: Map<string, Subscriptions>;
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Settings: RelaySettings;
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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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constructor(addr: string, options: RelaySettings) {
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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 = <StateSnapshot>{
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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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};
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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.Connect();
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}
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Connect() {
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this.IsClosed = false;
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this.Socket = new WebSocket(this.Address);
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this.Socket.onopen = (e) => this.OnOpen(e);
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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(e: Event) {
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this.ConnectTimeout = DefaultConnectTimeout;
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console.log(`[${this.Address}] Open!`);
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// send pending
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for (let p of this.Pending) {
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this._SendJson(p);
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}
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this.Pending = [];
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for (let [_, s] of this.Subscriptions) {
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this._SendSubscription(s);
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}
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this._UpdateState();
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}
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OnClose(e: CloseEvent) {
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if (!this.IsClosed) {
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this.ConnectTimeout = this.ConnectTimeout * 2;
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console.log(`[${this.Address}] Closed (${e.reason}), trying again in ${(this.ConnectTimeout / 1000).toFixed(0).toLocaleString()} sec`);
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this.ReconnectTimer = setTimeout(() => {
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this.Connect();
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}, this.ConnectTimeout);
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this.Stats.Disconnects++;
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} else {
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console.log(`[${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<any>) {
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if (e.data.length > 0) {
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let msg = JSON.parse(e.data);
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let tag = msg[0];
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switch (tag) {
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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("OK: ", msg);
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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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let 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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* 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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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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let 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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let 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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_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 = this.Stats.Latency.length > 0 ? (this.Stats.Latency.reduce((acc, v) => acc + v, 0) / this.Stats.Latency.length) : 0;
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this.CurrentState.disconnects = this.Stats.Disconnects;
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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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let state = this.GetState();
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for (let [_, h] of this.StateHooks) {
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h(state);
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}
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}
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_SendSubscription(sub: Subscriptions) {
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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 = [
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...req,
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...sub.OrSubs.map(o => o.ToObject())
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];
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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: any) {
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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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let 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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let 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! ${subId}`);
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// ignored for now, track as "dropped event" with connection stats
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}
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}
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_OnEnd(subId: string) {
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let sub = this.Subscriptions.get(subId);
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if (sub) {
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let now = new Date().getTime();
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let started = sub.Started.get(this.Address);
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sub.Finished.set(this.Address, now);
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if (started) {
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let responseTime = now - started;
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if (responseTime > 10_000) {
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console.warn(`[${this.Address}][${subId}] Slow response time ${(responseTime / 1000).toFixed(1)} seconds`);
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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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let payload = [
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0,
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ev.pubkey,
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ev.created_at,
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ev.kind,
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ev.tags,
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ev.content
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];
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let 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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let data = secp.utils.sha256Sync(payloadData);
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let 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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