How to access my Vue instance property inside of a web socket inside created

Question

I'd like to know how i can access my component messages (this.messages) from inside the chat socket on message function, so I can push a new message to my messages

Defining the websocket as a property is the way I managed to make it work. If there is a better way of doing it, I will be open to understand.

<script>
import axios from 'axios'

export default{
    data () {
        return {
            messages: [],
            conversation_id: 'global',
            content: '',
            tweeker: this.$store.state.username,
            formatted_time: 'Now',
            avatar: '',
            chatSocket: null,
        }
    },
    created() {
        var loc = window.location, new_uri;
        if (loc.protocol === "https:") {
            new_uri = "wss:";
        } else {
            new_uri = "ws:";
        }
        new_uri += "//" + "127.0.0.1:8000";
        this.chatSocket = new WebSocket(
            new_uri +
            '/ws/' +
            'chat/' +
            '0' +
            '/'
        );
        this.chatSocket.onmessage = function (e) {
            const data = JSON.parse(e.data);
            // append message to messages
            this.messages.push(data);
            setTimeout(() => {
                window.scrollTo(0, document.body.scrollHeight);
            }, 0);
        };
        this.getMessages();
    },
    methods: {
        async getMessages(){
            await axios.get(`/api/messages/global`,) 
            .then(response => {
                for (let i = 0; i < response.data.messages.length; i++) {
                    this.messages.push(response.data.messages[i])
                }
                this.scrollToBottom();
            }).catch(error => {
                console.log('error' + error)
            })
        },
        submitMessage() {
            if (this.content.length > 0) {
                let message = {
                    'content': this.content,
                    'tweeker_name': this.$store.state.username,
                    'formatted_time': this.formatted_time,
                    'avatar_url': this.avatar,
                    'conversation_id': '',
                };
                this.chatSocket.send(JSON.stringify(message));
                this.content = '';
            }
        },
        scrollToBottom() {
            window.scrollTo(0, document.body.scrollHeight);
        }
    }
}
</script>