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import { AttachmentOperation, AttachmentProps } from "@props/RecordProps";
import { fetchConfig } from "@utils/hooks/useConfig";
import { v4 as uuid } from "uuid";
import { WEBSOCKET_SERVER_URL } from "@config/base";
const DEFAULT_HEARTBEAT_INTERVAL_IN_SEC = 20;
let heartbeatIntervalInSec = DEFAULT_HEARTBEAT_INTERVAL_IN_SEC;
// 这里无法直接用 useConfig hook，因为 useConfig 依赖 react，需要在 react component 中调用
fetchConfig("websocket.heartbeatInterval", "int")
.then((config) => {
console.log(`websocket.heartbeatInterval: ${config.value}`);
if (config.value) {
heartbeatIntervalInSec = config.value as number;
}
})
.catch((error) => {
console.error(`Failed to fetch config for websocket.heartbeatInterval: ${error}`);
});
export interface AttachmentOperationProps extends AttachmentProps {
operation: AttachmentOperation; /* 操作类型 */
}
/* eslint-disable @typescript-eslint/ban-types */
export interface SocketInterface {
on: (fn: Function) => void;
replaceOn: (fn: Function) => void;
off: (fn: Function) => void;
onStateChange: (fn: Function) => void;
close: () => void;
getClient: () => void;
isConnected: () => boolean;
send: (content: string) => void;
sendFile: (props: AttachmentProps, file: File) => void;
numberOfMessageListeners: () => number;
}
export interface NetworkConnectedEvent {
type: 'connected';
}
export interface NetworkReconnectedEvent {
type: 'reconnected';
}
export interface NetworkClosedEvent {
type: 'closed';
}
export interface NetworkUpstreamMessage<P> {
msgId?: string;
topic: string;
payload: P;
}
export interface NetworkDownstreamMessage<P> {
msgId?: string;
topic: string;
payload: P;
}
export type NetworkEvent = NetworkConnectedEvent | NetworkReconnectedEvent | NetworkClosedEvent;
export type NetworkEventListener = (event: NetworkEvent) => void;
export type NetworkMessageListener<P> = (payload: P) => void;
export type UnregisterNetworkEventListener = () => void;
export class NetworkService {
private readonly url: string;
private readonly eventListeners: Array<NetworkEventListener> = [];
private readonly msgListeners: Record<string, Array<NetworkMessageListener<unknown>>> = {};
private readonly pendingMessagesResolver: Record<string, (payload: unknown) => void> = {};
private client?: WebSocket;
private reconnectOnClose = true;
constructor(url: string) {
this.url = url;
}
public readonly init = (): Promise<WebSocket> => {
if (this.client) {
return Promise.resolve(this.client);
}
return new Promise((resolve) => {
const client = new WebSocket(`${this.url}?access_token=${getAccessToken()}`);
client.onopen = () => {
this.eventListeners.forEach(l => l({ type: 'connected' }));
this.client = client;
// heartbeat
const heartbeatTimeout = setInterval(async () => {
if (client.readyState === client.CLOSED) {
clearInterval(heartbeatTimeout);
return;
}
await this.send('heartbeat', 'ping');
}, heartbeatIntervalInSec * 1000);
resolve(client);
};
client.onmessage = (event: MessageEvent<string>) => {
const msg = JSON.parse(event.data) as NetworkDownstreamMessage<unknown>;
if (msg.msgId) {
this.pendingMessagesResolver[msg.msgId]?.(msg.payload);
}
this.msgListeners[msg.topic]?.forEach(l => l(msg.payload));
};
client.onerror = (e) => {
console.error(e);
};
client.onclose = () => {
this.client = undefined;
this.eventListeners.forEach(l => l({ type: 'closed' }));
if (this.reconnectOnClose) {
setTimeout(() => {
this.init().then(() => {
this.eventListeners.forEach(l => l({ type: 'reconnected' }));
});
}, 1000);
}
};
});
};
public readonly close = (): void => {
this.reconnectOnClose = false;
this.client?.close();
};
public readonly onEvent = (listener: NetworkEventListener): UnregisterNetworkEventListener => {
this.eventListeners.push(listener);
return () => {
this.eventListeners.filter(l => l !== listener);
};
};
public readonly subscribe = <T>(topic: string, listener: NetworkMessageListener<T>): UnregisterNetworkEventListener => {
if (!this.msgListeners[topic]) {
this.msgListeners[topic] = [];
}
this.msgListeners[topic].push(listener as NetworkMessageListener<unknown>);
return () => {
this.msgListeners[topic].filter(l => l !== listener);
};
};
public readonly send = <P, R>(topic: string, payload: P, timeout?: number): Promise<R> => {
const msgId = uuid();
const upstreamMsg: NetworkUpstreamMessage<P> = {
msgId,
topic,
payload
};
return new Promise<R>((resolve, reject) => {
let timeoutId: NodeJS.Timeout | undefined = undefined;
if (timeout) {
timeoutId = setTimeout(() => {
reject(new Error(`Timeout after ${timeout} ms`));
}, timeout);
}
this.init().then((client) => {
client.send(JSON.stringify(upstreamMsg));
this.pendingMessagesResolver[msgId] = (payload: unknown) => {
if (timeoutId) {
clearTimeout(timeoutId);
}
resolve(payload as R);
};
});
});
};
public readonly sendOneWay = <P>(msgType: string, payload: P): void => {
const upstreamMsg: NetworkUpstreamMessage<P> = {
msgId: uuid(),
topic: msgType,
payload
};
this.init().then((client) => {
client.send(JSON.stringify(upstreamMsg));
});
};
}
let networkService: NetworkService | undefined = undefined;
export const getNetworkService = (): NetworkService => {
if (!networkService) {
networkService = new NetworkService(`${WEBSOCKET_SERVER_URL}/websocket/route`);
}
return networkService;
};
const ReconnectableSocket = (url: string): SocketInterface => {
let client: WebSocket;
let isConnected = false;
let reconnectOnClose = true;
let messageListeners: Array<Function> = [];
let stateChangeListeners: Array<Function> = [];
const on = (fn: Function): void => {
messageListeners.push(fn);
};
const replaceOn = (fn: Function): void => {
messageListeners = [fn];
};
const send = (content: string): void => {
client.send(content);
};
/**
* 通过 Websocket 发送文件到后台
* 先发送文件的元数据，包括文件名，文件大小等
* 然后发送文件的内容
*/
const sendFile = (props: AttachmentProps, file: File): void => {
const {
id, uid, ownerId, ownerClass, columnNameInOwnerClass, multiple
} = props;
const fileMetaData = {
lastModified: file.lastModified,
name: file.name,
type: file.type,
size: file.size,
uid: uid,
ownerId: ownerId ?? undefined,
ownerClass: ownerClass,
id: id ?? undefined,
columnNameInOwnerClass,
operation: "upload",
multiple
};
client.send(JSON.stringify(fileMetaData));
client.send(file);
};
const off = (fn: Function): void => {
messageListeners = messageListeners.filter(l => l !== fn);
};
const onStateChange = (fn: Function): void => {
stateChangeListeners = [fn];
};
const start = (): void => {
client = new WebSocket(`${url}?access_token=${getAccessToken()}`);
client.onopen = () => {
isConnected = true;
stateChangeListeners.forEach(fn => fn(true));
};
const { close } = client;
// heartbeat
const heartbeat = (): void => {
setTimeout(() => {
if (client.readyState === client.CLOSED) {
return;
}
send("ping");
heartbeat();
}, heartbeatIntervalInSec * 1000);
};
heartbeat();
// Close without reconnecting;
client.close = () => {
reconnectOnClose = false;
messageListeners = [];
stateChangeListeners = [];
close.call(client);
};
client.onmessage = (event) => {
if (event.data === "pong") {
return;
}
messageListeners.forEach(fn => fn(event.data));
};
client.onerror = (e) => {
console.error(e);
};
client.onclose = () => {
isConnected = false;
stateChangeListeners.forEach(fn => fn(false));
if (!reconnectOnClose) {
return;
}
setTimeout(start, 1000 * 10);
};
};
start();
return {
on,
replaceOn,
off,
send,
sendFile,
onStateChange,
close: () => client.close(),
getClient: () => client,
isConnected: () => isConnected,
numberOfMessageListeners: () => messageListeners.length,
};
};
export default ReconnectableSocket;
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