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websocket
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class Socket { | |
constructor( | |
domain, | |
{ reconnection = true, reconnectionDelay = 1000 } = { | |
reconnection: true, | |
reconnectionDelay: 1000, | |
} | |
) { | |
this.ws = this.connect(domain); | |
this.reconnection = reconnection; | |
this.reconnectionDelay = reconnectionDelay; | |
this.CLOSED = true; | |
this.events = {}; | |
} | |
connect(domain) { | |
if (!domain) return null; | |
this.ws = new WebSocket(domain); | |
this.CLOSED = false; | |
this.ws.onopen = () => { | |
if (this.events.open) this.events.open(); | |
// subscribe to some channels | |
this.ws.send(JSON.stringify({ | |
//.... some message the I must send when I connect .... | |
})); | |
}; | |
this.ws.onmessage = (e) => { | |
const type = e.data && e.data.type; | |
const data = e.data && e.data.data; | |
if (this.events[type]) this.events[type](JSON.parse(data)); | |
}; | |
this.ws.onclose = (e) => { | |
console.log('Socket is closed. Reconnect will be attempted.', e.reason); | |
if (this.reconnection && !this.CLOSED) { | |
setTimeout(() => { | |
this.ws = this.connect(domain); | |
}, this.reconnectionDelay); | |
} | |
}; | |
this.ws.onerror = (err) => { | |
console.error( | |
'Socket encountered error: ', | |
err.message, | |
'Closing socket' | |
); | |
this.ws.close(); | |
}; | |
return this.ws; | |
} | |
disconnect() { | |
this.CLOSED = true; | |
this.ws.close(); | |
} | |
on(eventName, handler) { | |
this.events[eventName] = handler; | |
} | |
emit(eventName, data) { | |
this.ws.send( | |
JSON.stringify({ | |
type: eventName, | |
data, | |
}) | |
); | |
} | |
} | |
const ws = new Socket(domain, options); | |
// Emits an event to the socket identified by the string name. | |
// ws.emit('hello', 'world'); | |
// Register a new handler for the given event. | |
// ws.on('news', (data) => { console.log(data); }); |
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