Created
November 4, 2015 10:55
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A websocket helper class written in typescript for use with angularjs
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module Utilities { | |
export class WebSocketHelper { | |
constructor(private $q: ng.IQService, private url: string, private connectionInterval = 5000) { | |
} | |
private wsPromise: ng.IPromise<WebSocket>; | |
private createWebSocket(): ng.IPromise<WebSocket> { | |
var d = this.$q.defer(); | |
try { | |
var ws = new WebSocket(this.url); | |
ws.onerror = (evt) => { | |
console.log(evt); | |
setTimeout(() => { | |
var newPromise = this.createWebSocket(); | |
d.resolve(newPromise); | |
}, this.connectionInterval); | |
}; | |
ws.onopen = (evt) => { | |
console.log(evt); | |
d.resolve(ws); | |
}; | |
} catch (e) { | |
setTimeout(() => { | |
var newPromise = this.createWebSocket(); | |
d.resolve(newPromise); | |
}, this.connectionInterval); | |
} | |
return d.promise; | |
} | |
public getWebSocket(): ng.IPromise<WebSocket> { | |
var d = this.$q.defer(); | |
if (this.wsPromise == null) { | |
this.wsPromise = this.createWebSocket(); | |
this.wsPromise.then((ws) => { | |
ws.onmessage = evt => { | |
this.onMessage(evt); | |
}; | |
ws.onclose = (evt) => { | |
console.log(evt); | |
setTimeout(() => { | |
this.wsPromise = null; | |
var newPromise = this.getWebSocket(); | |
newPromise.then((nws) => { | |
this.onReconnect(nws); | |
}); | |
}, this.connectionInterval); | |
}; | |
d.resolve(ws); | |
return ws; | |
}); | |
} else { | |
this.wsPromise.then((ws) => { | |
d.resolve(ws); | |
return ws; | |
}); | |
} | |
return d.promise; | |
} | |
public messageHandler; | |
private onMessage(evt) { | |
try { | |
this.messageHandler(evt); | |
} catch (e) { | |
console.log(e); | |
} | |
} | |
public reconnectHandler; | |
private onReconnect(ws) { | |
try { | |
this.reconnectHandler(ws); | |
} catch (e) { | |
console.log(e); | |
} | |
} | |
} | |
} |
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