340 lines
8.4 KiB
TypeScript
340 lines
8.4 KiB
TypeScript
import autobind from 'autobind-decorator';
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import { EventEmitter } from 'eventemitter3';
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import ReconnectingWebsocket from 'reconnecting-websocket';
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import { BroadcastEvents, Channels } from './streaming.types';
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export function urlQuery(obj: Record<string, unknown>): string {
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const params = Object.entries(obj)
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.filter(([, v]) => Array.isArray(v) ? v.length : v !== undefined)
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.reduce((a, [k, v]) => (a[k] = v, a), {} as Record<string, unknown>);
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return Object.entries(params)
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.map((e) => `${e[0]}=${e[1]}`)
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.map((e) => `${e[0]}=${encodeURIComponent(e[1])}`)
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.join('&');
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}
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type AnyOf<T extends Record<any, any>> = T[keyof T];
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type StreamEvents = {
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_connected_: void;
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_disconnected_: void;
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} & BroadcastEvents;
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/**
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* Misskey stream connection
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*/
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export default class Stream extends EventEmitter<StreamEvents> {
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private stream: ReconnectingWebsocket;
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public state: 'initializing' | 'reconnecting' | 'connected' = 'initializing';
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private sharedConnectionPools: Pool[] = [];
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private sharedConnections: SharedConnection[] = [];
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private nonSharedConnections: NonSharedConnection[] = [];
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private idCounter = 0;
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constructor(origin: string, user: { token: string; } | null, options?: {
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WebSocket?: any;
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}) {
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super();
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options = options || { };
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const query = urlQuery({
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i: user?.token,
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// To prevent cache of an HTML such as error screen
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_t: Date.now(),
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});
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const wsOrigin = origin.replace('http://', 'ws://').replace('https://', 'wss://');
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this.stream = new ReconnectingWebsocket(`${wsOrigin}/streaming?${query}`, '', {
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minReconnectionDelay: 1, // https://github.com/pladaria/reconnecting-websocket/issues/91
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WebSocket: options.WebSocket,
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});
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this.stream.addEventListener('open', this.onOpen);
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this.stream.addEventListener('close', this.onClose);
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this.stream.addEventListener('message', this.onMessage);
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}
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@autobind
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private genId(): string {
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return (++this.idCounter).toString();
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}
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@autobind
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public useChannel<C extends keyof Channels>(channel: C, params?: Channels[C]['params'], name?: string): Connection<Channels[C]> {
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if (params) {
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return this.connectToChannel(channel, params);
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} else {
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return this.useSharedConnection(channel, name);
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}
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}
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@autobind
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private useSharedConnection<C extends keyof Channels>(channel: C, name?: string): SharedConnection<Channels[C]> {
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let pool = this.sharedConnectionPools.find(p => p.channel === channel);
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if (pool == null) {
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pool = new Pool(this, channel, this.genId());
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this.sharedConnectionPools.push(pool);
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}
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const connection = new SharedConnection(this, channel, pool, name);
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this.sharedConnections.push(connection);
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return connection;
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}
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@autobind
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public removeSharedConnection(connection: SharedConnection): void {
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this.sharedConnections = this.sharedConnections.filter(c => c !== connection);
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}
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@autobind
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public removeSharedConnectionPool(pool: Pool): void {
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this.sharedConnectionPools = this.sharedConnectionPools.filter(p => p !== pool);
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}
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@autobind
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private connectToChannel<C extends keyof Channels>(channel: C, params: Channels[C]['params']): NonSharedConnection<Channels[C]> {
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const connection = new NonSharedConnection(this, channel, this.genId(), params);
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this.nonSharedConnections.push(connection);
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return connection;
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}
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@autobind
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public disconnectToChannel(connection: NonSharedConnection): void {
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this.nonSharedConnections = this.nonSharedConnections.filter(c => c !== connection);
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}
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/**
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* Callback of when open connection
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*/
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@autobind
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private onOpen(): void {
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const isReconnect = this.state === 'reconnecting';
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this.state = 'connected';
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this.emit('_connected_');
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// チャンネル再接続
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if (isReconnect) {
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for (const p of this.sharedConnectionPools) p.connect();
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for (const c of this.nonSharedConnections) c.connect();
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}
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}
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/**
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* Callback of when close connection
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*/
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@autobind
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private onClose(): void {
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if (this.state === 'connected') {
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this.state = 'reconnecting';
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this.emit('_disconnected_');
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}
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}
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/**
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* Callback of when received a message from connection
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*/
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@autobind
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private onMessage(message: { data: string; }): void {
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const { type, body } = JSON.parse(message.data);
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if (type === 'channel') {
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const id = body.id;
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let connections: Connection[];
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connections = this.sharedConnections.filter(c => c.id === id);
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if (connections.length === 0) {
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const found = this.nonSharedConnections.find(c => c.id === id);
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if (found) {
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connections = [found];
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}
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}
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for (const c of connections) {
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c.emit(body.type, Object.freeze(body.body));
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c.inCount++;
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}
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} else {
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this.emit(type, Object.freeze(body));
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}
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}
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/**
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* Send a message to connection
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*/
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@autobind
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public send(typeOrPayload: any, payload?: any): void {
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const data = payload === undefined ? typeOrPayload : {
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type: typeOrPayload,
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body: payload,
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};
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this.stream.send(JSON.stringify(data));
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}
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/**
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* Close this connection
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*/
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@autobind
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public close(): void {
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this.stream.close();
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}
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}
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// TODO: これらのクラスを Stream クラスの内部クラスにすれば余計なメンバをpublicにしないで済むかも？
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// もしくは @internal を使う？ https://www.typescriptlang.org/tsconfig#stripInternal
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class Pool {
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public channel: string;
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public id: string;
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protected stream: Stream;
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public users = 0;
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private disposeTimerId: any;
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private isConnected = false;
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constructor(stream: Stream, channel: string, id: string) {
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this.channel = channel;
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this.stream = stream;
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this.id = id;
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this.stream.on('_disconnected_', this.onStreamDisconnected);
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}
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@autobind
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private onStreamDisconnected(): void {
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this.isConnected = false;
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}
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@autobind
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public inc(): void {
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if (this.users === 0 && !this.isConnected) {
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this.connect();
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}
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this.users++;
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// タイマー解除
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if (this.disposeTimerId) {
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clearTimeout(this.disposeTimerId);
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this.disposeTimerId = null;
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}
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}
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@autobind
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public dec(): void {
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this.users--;
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// そのコネクションの利用者が誰もいなくなったら
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if (this.users === 0) {
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// また直ぐに再利用される可能性があるので、一定時間待ち、
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// 新たな利用者が現れなければコネクションを切断する
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this.disposeTimerId = setTimeout(() => {
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this.disconnect();
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}, 3000);
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}
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}
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@autobind
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public connect(): void {
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if (this.isConnected) return;
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this.isConnected = true;
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this.stream.send('connect', {
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channel: this.channel,
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id: this.id,
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});
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}
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@autobind
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private disconnect(): void {
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this.stream.off('_disconnected_', this.onStreamDisconnected);
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this.stream.send('disconnect', { id: this.id });
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this.stream.removeSharedConnectionPool(this);
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}
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}
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abstract class Connection<Channel extends AnyOf<Channels> = any> extends EventEmitter<Channel['events']> {
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public channel: string;
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protected stream: Stream;
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public abstract id: string;
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public name?: string; // for debug
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public inCount = 0; // for debug
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public outCount = 0; // for debug
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constructor(stream: Stream, channel: string, name?: string) {
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super();
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this.stream = stream;
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this.channel = channel;
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this.name = name;
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}
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@autobind
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public send<T extends keyof Channel['receives']>(type: T, body: Channel['receives'][T]): void {
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this.stream.send('ch', {
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id: this.id,
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type: type,
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body: body,
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});
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this.outCount++;
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}
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public abstract dispose(): void;
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}
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class SharedConnection<Channel extends AnyOf<Channels> = any> extends Connection<Channel> {
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private pool: Pool;
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public get id(): string {
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return this.pool.id;
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}
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constructor(stream: Stream, channel: string, pool: Pool, name?: string) {
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super(stream, channel, name);
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this.pool = pool;
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this.pool.inc();
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}
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@autobind
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public dispose(): void {
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this.pool.dec();
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this.removeAllListeners();
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this.stream.removeSharedConnection(this);
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}
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}
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class NonSharedConnection<Channel extends AnyOf<Channels> = any> extends Connection<Channel> {
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public id: string;
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protected params: Channel['params'];
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constructor(stream: Stream, channel: string, id: string, params: Channel['params']) {
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super(stream, channel);
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this.params = params;
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this.id = id;
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this.connect();
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}
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@autobind
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public connect(): void {
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this.stream.send('connect', {
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channel: this.channel,
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id: this.id,
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params: this.params,
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});
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}
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@autobind
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public dispose(): void {
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this.removeAllListeners();
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this.stream.send('disconnect', { id: this.id });
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this.stream.disconnectToChannel(this);
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}
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}
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