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streaming.ts
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streaming.ts
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import autobind from 'autobind-decorator';
import { EventEmitter } from 'eventemitter3';
import ReconnectingWebsocket from 'reconnecting-websocket';
import { stringify } from 'querystring';
import { BroadcastEvents, Channels } from './streaming.types';
function urlQuery(obj: Record<string, unknown>): string {
return stringify(Object.entries(obj)
.filter(([, v]) => Array.isArray(v) ? v.length : v !== undefined)
.reduce((a, [k, v]) => (a[k] = v, a), {} as Record<string, any>));
}
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();
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);
}
@autobind
private genId(): string {
return (++this.idCounter).toString();
}
@autobind
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);
}
}
@autobind
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;
}
@autobind
public removeSharedConnection(connection: SharedConnection) {
this.sharedConnections = this.sharedConnections.filter(c => c !== connection);
}
@autobind
public removeSharedConnectionPool(pool: Pool) {
this.sharedConnectionPools = this.sharedConnectionPools.filter(p => p !== pool);
}
@autobind
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;
}
@autobind
public disconnectToChannel(connection: NonSharedConnection) {
this.nonSharedConnections = this.nonSharedConnections.filter(c => c !== connection);
}
/**
* Callback of when open connection
*/
@autobind
private onOpen() {
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
*/
@autobind
private onClose() {
if (this.state === 'connected') {
this.state = 'reconnecting';
this.emit('_disconnected_');
}
}
/**
* Callback of when received a message from connection
*/
@autobind
private onMessage(message: { data: string; }) {
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.filter(c => c != null)) {
c.emit(body.type, Object.freeze(body.body));
c.inCount++;
}
} else {
this.emit(type, Object.freeze(body));
}
}
/**
* Send a message to connection
*/
@autobind
public send(typeOrPayload: any, payload?: any) {
const data = payload === undefined ? typeOrPayload : {
type: typeOrPayload,
body: payload
};
this.stream.send(JSON.stringify(data));
}
/**
* Close this connection
*/
@autobind
public close() {
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.channel = channel;
this.stream = stream;
this.id = id;
this.stream.on('_disconnected_', this.onStreamDisconnected);
}
@autobind
private onStreamDisconnected() {
this.isConnected = false;
}
@autobind
public inc() {
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;
}
}
@autobind
public dec() {
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);
}
}
@autobind
public connect() {
if (this.isConnected) return;
this.isConnected = true;
this.stream.send('connect', {
channel: this.channel,
id: this.id
});
}
@autobind
private disconnect() {
this.stream.off('_disconnected_', this.onStreamDisconnected);
this.stream.send('disconnect', { id: this.id });
this.stream.removeSharedConnectionPool(this);
}
}
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: number = 0; // for debug
public outCount: number = 0; // for debug
constructor(stream: Stream, channel: string, name?: string) {
super();
this.stream = stream;
this.channel = channel;
this.name = name;
}
@autobind
public send<T extends keyof Channel['receives']>(type: T, body: Channel['receives'][T]) {
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.pool = pool;
this.pool.inc();
}
@autobind
public dispose() {
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.params = params;
this.id = id;
this.connect();
}
@autobind
public connect() {
this.stream.send('connect', {
channel: this.channel,
id: this.id,
params: this.params
});
}
@autobind
public dispose() {
this.removeAllListeners();
this.stream.send('disconnect', { id: this.id });
this.stream.disconnectToChannel(this);
}
}