AngularJS: Implementing WebSocket Reconnection Logic within a Service

Question

AngularJS: Implementing WebSocket Reconnection Logic within a Service

Utilizing web sockets within my AngularJS application has been a great addition.
However, I encountered an issue where the web socket connection closes when a user logs out. Upon the user logging back in, I need to reconnect the web socket.
The current setup involves housing the web socket within a service, with the following simplified code:

angular.module('myApp').factory("SubscriptionFactory", function () {
    var Service = {};
    var ws = new WebSocket("ws://127.0.0.1:8000");

    /* Omitting WS methods (onopen, onmessage, etc.) for brevity */

    Service.reestablishConnection = function() {
        // Reestablishing connection
        ws = new WebSocket("ws://127.0.0.1:8000");
    }
    return Service;

The issue arises when the new instance of the web socket does not function as intended.
After researching, I found that the web socket needs to reattach its handlers to the object upon recreation, as discussed in this question.
Moreover, since an AngularJS service is a singleton by nature (as highlighted in this question), I'm left wondering how I can recreate the web socket instance within my AngularJS singleton service.

javascript angularjs sockets service websocket

Answer 1

Answer №1

I managed to figure out the answer on my own. Surprisingly, it was quite straightforward:

angular.module('myApp').factory("SubscriptionFactory", function () {
    var Service = {};
    var ws;

    Service.onMessage = function(message) { /* some code */};
    Service.onClose = function() { /* some code */ };
    Service.onOpen = function() { /* some code */};
    Service.onError = function(error) { /* some code */};

    Service.connect = function() {
        // Establish connection
        ws = new WebSocket("ws://127.0.0.1:8000");
        // Reattaching handlers to object
        ws.onmessage = Service.onMessage;
        ws.onclose = Service.onClose;
        ws.onopen = Service.onOpen;
        ws.onerror = Service.onError;
    }
    return Service;

Essentially, what's happening here is that I am creating a new Web Socket object and carefully linking the Web Socket handlers to my AngularJS service.

Answer 2

I managed to figure out the answer on my own. Surprisingly, it was quite straightforward:

angular.module('myApp').factory("SubscriptionFactory", function () {
    var Service = {};
    var ws;

    Service.onMessage = function(message) { /* some code */};
    Service.onClose = function() { /* some code */ };
    Service.onOpen = function() { /* some code */};
    Service.onError = function(error) { /* some code */};

    Service.connect = function() {
        // Establish connection
        ws = new WebSocket("ws://127.0.0.1:8000");
        // Reattaching handlers to object
        ws.onmessage = Service.onMessage;
        ws.onclose = Service.onClose;
        ws.onopen = Service.onOpen;
        ws.onerror = Service.onError;
    }
    return Service;

Essentially, what's happening here is that I am creating a new Web Socket object and carefully linking the Web Socket handlers to my AngularJS service.

AngularJS: Implementing WebSocket Reconnection Logic within a Service

Answer №1

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