353 lines
9.5 KiB
TypeScript
353 lines
9.5 KiB
TypeScript
import { EventEmitter } from 'eventemitter3';
|
||
import ReconnectingWebsocket from 'reconnecting-websocket';
|
||
import type { BroadcastEvents, Channels } from './streaming.types.js';
|
||
|
||
export function urlQuery(obj: Record<string, string | number | boolean | undefined>): string {
|
||
const params = Object.entries(obj)
|
||
.filter(([, v]) => Array.isArray(v) ? v.length : v !== undefined)
|
||
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
|
||
.reduce((a, [k, v]) => (a[k] = v!, a), {} as Record<string, string | number | boolean>);
|
||
|
||
return Object.entries(params)
|
||
.map((e) => `${e[0]}=${encodeURIComponent(e[1])}`)
|
||
.join('&');
|
||
}
|
||
|
||
type AnyOf<T extends Record<any, any>> = T[keyof T];
|
||
|
||
type StreamEvents = {
|
||
_connected_: void;
|
||
_disconnected_: void;
|
||
} & BroadcastEvents;
|
||
|
||
/**
|
||
* Misskey stream connection
|
||
*/
|
||
export default class Stream extends EventEmitter<StreamEvents> {
|
||
private stream: ReconnectingWebsocket;
|
||
public state: 'initializing' | 'reconnecting' | 'connected' = 'initializing';
|
||
private sharedConnectionPools: Pool[] = [];
|
||
private sharedConnections: SharedConnection[] = [];
|
||
private nonSharedConnections: NonSharedConnection[] = [];
|
||
private idCounter = 0;
|
||
|
||
constructor(origin: string, user: { token: string; } | null, options?: {
|
||
WebSocket?: any;
|
||
}) {
|
||
super();
|
||
|
||
this.genId = this.genId.bind(this);
|
||
this.useChannel = this.useChannel.bind(this);
|
||
this.useSharedConnection = this.useSharedConnection.bind(this);
|
||
this.removeSharedConnection = this.removeSharedConnection.bind(this);
|
||
this.removeSharedConnectionPool = this.removeSharedConnectionPool.bind(this);
|
||
this.connectToChannel = this.connectToChannel.bind(this);
|
||
this.disconnectToChannel = this.disconnectToChannel.bind(this);
|
||
this.onOpen = this.onOpen.bind(this);
|
||
this.onClose = this.onClose.bind(this);
|
||
this.onMessage = this.onMessage.bind(this);
|
||
this.send = this.send.bind(this);
|
||
this.close = this.close.bind(this);
|
||
|
||
options = options ?? { };
|
||
|
||
const query = urlQuery({
|
||
i: user?.token,
|
||
|
||
// To prevent cache of an HTML such as error screen
|
||
_t: Date.now(),
|
||
});
|
||
|
||
const wsOrigin = origin.replace('http://', 'ws://').replace('https://', 'wss://');
|
||
|
||
this.stream = new ReconnectingWebsocket(`${wsOrigin}/streaming?${query}`, '', {
|
||
minReconnectionDelay: 1, // https://github.com/pladaria/reconnecting-websocket/issues/91
|
||
WebSocket: options.WebSocket,
|
||
});
|
||
this.stream.addEventListener('open', this.onOpen);
|
||
this.stream.addEventListener('close', this.onClose);
|
||
this.stream.addEventListener('message', this.onMessage);
|
||
}
|
||
|
||
private genId(): string {
|
||
return (++this.idCounter).toString();
|
||
}
|
||
|
||
public useChannel<C extends keyof Channels>(channel: C, params?: Channels[C]['params'], name?: string): Connection<Channels[C]> {
|
||
if (params) {
|
||
return this.connectToChannel(channel, params);
|
||
} else {
|
||
return this.useSharedConnection(channel, name);
|
||
}
|
||
}
|
||
|
||
private useSharedConnection<C extends keyof Channels>(channel: C, name?: string): SharedConnection<Channels[C]> {
|
||
let pool = this.sharedConnectionPools.find(p => p.channel === channel);
|
||
|
||
if (pool == null) {
|
||
pool = new Pool(this, channel, this.genId());
|
||
this.sharedConnectionPools.push(pool);
|
||
}
|
||
|
||
const connection = new SharedConnection(this, channel, pool, name);
|
||
this.sharedConnections.push(connection);
|
||
return connection;
|
||
}
|
||
|
||
public removeSharedConnection(connection: SharedConnection): void {
|
||
this.sharedConnections = this.sharedConnections.filter(c => c !== connection);
|
||
}
|
||
|
||
public removeSharedConnectionPool(pool: Pool): void {
|
||
this.sharedConnectionPools = this.sharedConnectionPools.filter(p => p !== pool);
|
||
}
|
||
|
||
private connectToChannel<C extends keyof Channels>(channel: C, params: Channels[C]['params']): NonSharedConnection<Channels[C]> {
|
||
const connection = new NonSharedConnection(this, channel, this.genId(), params);
|
||
this.nonSharedConnections.push(connection);
|
||
return connection;
|
||
}
|
||
|
||
public disconnectToChannel(connection: NonSharedConnection): void {
|
||
this.nonSharedConnections = this.nonSharedConnections.filter(c => c !== connection);
|
||
}
|
||
|
||
/**
|
||
* Callback of when open connection
|
||
*/
|
||
private onOpen(): void {
|
||
const isReconnect = this.state === 'reconnecting';
|
||
|
||
this.state = 'connected';
|
||
this.emit('_connected_');
|
||
|
||
// チャンネル再接続
|
||
if (isReconnect) {
|
||
for (const p of this.sharedConnectionPools) p.connect();
|
||
for (const c of this.nonSharedConnections) c.connect();
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Callback of when close connection
|
||
*/
|
||
private onClose(): void {
|
||
if (this.state === 'connected') {
|
||
this.state = 'reconnecting';
|
||
this.emit('_disconnected_');
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Callback of when received a message from connection
|
||
*/
|
||
private onMessage(message: { data: string; }): void {
|
||
const { type, body } = JSON.parse(message.data);
|
||
|
||
if (type === 'channel') {
|
||
const id = body.id;
|
||
|
||
let connections: Connection[];
|
||
|
||
connections = this.sharedConnections.filter(c => c.id === id);
|
||
|
||
if (connections.length === 0) {
|
||
const found = this.nonSharedConnections.find(c => c.id === id);
|
||
if (found) {
|
||
connections = [found];
|
||
}
|
||
}
|
||
|
||
for (const c of connections) {
|
||
c.emit(body.type, body.body);
|
||
c.inCount++;
|
||
}
|
||
} else {
|
||
this.emit(type, body);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Send a message to connection
|
||
* ! ストリーム上のやり取りはすべてJSONで行われます !
|
||
*/
|
||
public send(typeOrPayload: string): void
|
||
public send(typeOrPayload: string, payload: any): void
|
||
public send(typeOrPayload: Record<string, any> | any[]): void
|
||
public send(typeOrPayload: string | Record<string, any> | any[], payload?: any): void {
|
||
if (typeof typeOrPayload === 'string') {
|
||
this.stream.send(JSON.stringify({
|
||
type: typeOrPayload,
|
||
...(payload === undefined ? {} : { body: payload }),
|
||
}));
|
||
return;
|
||
}
|
||
|
||
this.stream.send(JSON.stringify(typeOrPayload));
|
||
}
|
||
|
||
/**
|
||
* Close this connection
|
||
*/
|
||
public close(): void {
|
||
this.stream.close();
|
||
}
|
||
}
|
||
|
||
// 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？
|
||
// もしくは @internal を使う？ https://www.typescriptlang.org/tsconfig#stripInternal
|
||
class Pool {
|
||
public channel: string;
|
||
public id: string;
|
||
protected stream: Stream;
|
||
public users = 0;
|
||
private disposeTimerId: any;
|
||
private isConnected = false;
|
||
|
||
constructor(stream: Stream, channel: string, id: string) {
|
||
this.onStreamDisconnected = this.onStreamDisconnected.bind(this);
|
||
this.inc = this.inc.bind(this);
|
||
this.dec = this.dec.bind(this);
|
||
this.connect = this.connect.bind(this);
|
||
this.disconnect = this.disconnect.bind(this);
|
||
|
||
this.channel = channel;
|
||
this.stream = stream;
|
||
this.id = id;
|
||
|
||
this.stream.on('_disconnected_', this.onStreamDisconnected);
|
||
}
|
||
|
||
private onStreamDisconnected(): void {
|
||
this.isConnected = false;
|
||
}
|
||
|
||
public inc(): void {
|
||
if (this.users === 0 && !this.isConnected) {
|
||
this.connect();
|
||
}
|
||
|
||
this.users++;
|
||
|
||
// タイマー解除
|
||
if (this.disposeTimerId) {
|
||
clearTimeout(this.disposeTimerId);
|
||
this.disposeTimerId = null;
|
||
}
|
||
}
|
||
|
||
public dec(): void {
|
||
this.users--;
|
||
|
||
// そのコネクションの利用者が誰もいなくなったら
|
||
if (this.users === 0) {
|
||
// 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、
|
||
// 新たな利用者が現れなければコネクションを切断する
|
||
this.disposeTimerId = setTimeout(() => {
|
||
this.disconnect();
|
||
}, 3000);
|
||
}
|
||
}
|
||
|
||
public connect(): void {
|
||
if (this.isConnected) return;
|
||
this.isConnected = true;
|
||
this.stream.send('connect', {
|
||
channel: this.channel,
|
||
id: this.id,
|
||
});
|
||
}
|
||
|
||
private disconnect(): void {
|
||
this.stream.off('_disconnected_', this.onStreamDisconnected);
|
||
this.stream.send('disconnect', { id: this.id });
|
||
this.stream.removeSharedConnectionPool(this);
|
||
}
|
||
}
|
||
|
||
export abstract class Connection<Channel extends AnyOf<Channels> = any> extends EventEmitter<Channel['events']> {
|
||
public channel: string;
|
||
protected stream: Stream;
|
||
public abstract id: string;
|
||
|
||
public name?: string; // for debug
|
||
public inCount = 0; // for debug
|
||
public outCount = 0; // for debug
|
||
|
||
constructor(stream: Stream, channel: string, name?: string) {
|
||
super();
|
||
|
||
this.send = this.send.bind(this);
|
||
|
||
this.stream = stream;
|
||
this.channel = channel;
|
||
this.name = name;
|
||
}
|
||
|
||
public send<T extends keyof Channel['receives']>(type: T, body: Channel['receives'][T]): void {
|
||
this.stream.send('ch', {
|
||
id: this.id,
|
||
type: type,
|
||
body: body,
|
||
});
|
||
|
||
this.outCount++;
|
||
}
|
||
|
||
public abstract dispose(): void;
|
||
}
|
||
|
||
class SharedConnection<Channel extends AnyOf<Channels> = any> extends Connection<Channel> {
|
||
private pool: Pool;
|
||
|
||
public get id(): string {
|
||
return this.pool.id;
|
||
}
|
||
|
||
constructor(stream: Stream, channel: string, pool: Pool, name?: string) {
|
||
super(stream, channel, name);
|
||
|
||
this.dispose = this.dispose.bind(this);
|
||
|
||
this.pool = pool;
|
||
this.pool.inc();
|
||
}
|
||
|
||
public dispose(): void {
|
||
this.pool.dec();
|
||
this.removeAllListeners();
|
||
this.stream.removeSharedConnection(this);
|
||
}
|
||
}
|
||
|
||
class NonSharedConnection<Channel extends AnyOf<Channels> = any> extends Connection<Channel> {
|
||
public id: string;
|
||
protected params: Channel['params'];
|
||
|
||
constructor(stream: Stream, channel: string, id: string, params: Channel['params']) {
|
||
super(stream, channel);
|
||
|
||
this.connect = this.connect.bind(this);
|
||
this.dispose = this.dispose.bind(this);
|
||
|
||
this.params = params;
|
||
this.id = id;
|
||
|
||
this.connect();
|
||
}
|
||
|
||
public connect(): void {
|
||
this.stream.send('connect', {
|
||
channel: this.channel,
|
||
id: this.id,
|
||
params: this.params,
|
||
});
|
||
}
|
||
|
||
public dispose(): void {
|
||
this.removeAllListeners();
|
||
this.stream.send('disconnect', { id: this.id });
|
||
this.stream.disconnectToChannel(this);
|
||
}
|
||
}
|