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index.ts
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index.ts
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import { type WSGOEventName, type WSGOConfig, type WSGOSubscriptions } from './types'
import { send } from './send'
import { subscribe } from './subscribe'
import type { WSGOSubscribeCallback } from './subscribe/types'
import { heartbeatStart, heartbeatStop, listenHeartbeat } from './heartbeat'
/** Method allows you create new WebSocket connection */
export default function create(
url: string,
config: Partial<WSGOConfig> = {},
): {
ws: WebSocket | undefined
// status: 'OPEN' | 'CLOSED' | 'CONNECTING'
open: () => void
close: () => void
send: (eventName: WSGOEventName, data?: Parameters<typeof send>[1]) => void
subscribe: <T>(eventName: WSGOEventName, callback: WSGOSubscribeCallback<T>) => void
} {
let ws: WebSocket | undefined
const subscriptions: WSGOSubscriptions = {}
const _config = config as WSGOConfig
for (const option of ['debugging', 'immediate', 'heartbeat'] as Array<keyof typeof config>) {
if (_config[option] !== undefined) continue
if (option === 'debugging') {
_config[option] = false
continue
}
if (option === 'immediate' || option === 'heartbeat') {
_config[option] = true
continue
}
}
if (_config.immediate) {
ws = open(url, _config)
if (ws !== undefined) {
_listen(ws, subscriptions, _config)
}
}
return {
get ws() {
return ws
},
open: () => {
ws = open(url, _config)
if (ws !== undefined) {
_listen(ws, subscriptions, _config)
}
},
close: () => {
close(ws)
},
send: (...args) => {
send(...args, ws, _config)
},
subscribe: (...args) => {
subscribe(...args, subscriptions, _config)
},
}
}
function open(url: string, _config: WSGOConfig): WebSocket {
// close()
const ws = new WebSocket(url)
// if (config.heartbeat) {
// heartbeatStart(ws)
// }
return ws
}
function _listen(ws: WebSocket, subscriptions: WSGOSubscriptions, _config: WSGOConfig): void {
ws.onopen = (ev) => {
_config.onConnected?.(ws, ev)
heartbeatStart(ws)
}
ws.onclose = (ev) => {
_config.onDisconnected?.(ws, ev)
heartbeatStop()
}
ws.onerror = (ev) => {
_config.onError?.(ws, ev)
}
ws.onmessage = (e: MessageEvent<any>): any => {
listenHeartbeat(ws, e)
let message
try {
message = JSON.parse(e.data)
} catch (e) {
if (_config.debugging) {
console.error(e)
}
return
}
if (message.event in subscriptions) {
subscriptions[message.event](message)
}
}
}
function close(ws?: WebSocket, ...[code = 1000, reason]: Parameters<WebSocket['close']>): void {
if (ws === undefined) return
// stop heartbeat interval
heartbeatStop()
// close websocket connection
ws.close(code, reason)
}