initial import

frontend/src/App.vue

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+<template>
+  <div id="app">
+    <nav class="navbar" role="navigation" aria-label="main navigation">
+      <div class="container">
+        <div class="navbar-brand">
+          <a class="navbar-item" href="https://bulma.io">
+            <img src="https://bulma.io/images/bulma-logo.png" width="112" height="28" />
+          </a>
+
+          <a
+            role="button"
+            class="navbar-burger burger"
+            aria-label="menu"
+            aria-expanded="false"
+            data-target="navbarBasicExample"
+          >
+            <span aria-hidden="true"></span>
+            <span aria-hidden="true"></span>
+            <span aria-hidden="true"></span>
+          </a>
+        </div>
+
+        <div id="navbarBasicExample" class="navbar-menu">
+          <div class="navbar-start">
+            <a class="navbar-item">Home</a>
+          </div>
+          <div class="navbar-end"></div>
+        </div>
+      </div>
+    </nav>
+    <router-view />
+  </div>
+</template>

frontend/src/assets/main.scss

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+@import "~bulma/sass/utilities/initial-variables";
+
+$scheme-main: $black-ter;
+$scheme-invert: $white-ter;
+$text: $grey-lightest;
+
+@import "~bulma/bulma";

frontend/src/components/Connection.vue

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+<template>
+  <div class="notification" v-bind:class="active ? 'is-success' : 'is-danger'">
+    <span v-if="active">Connected as {{ channel }}</span>
+    <span v-else>Disconnected</span>
+  </div>
+</template>
+
+<script>
+import eventSource from "@/eventsource";
+
+export default {
+  name: "Connection",
+  computed: {
+    active() {
+      return eventSource.isConnected()
+    },
+    
+  },
+  props: {
+    channel: String,
+    active: Boolean,
+  },
+};
+</script>

frontend/src/components/HelloWorld.vue

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+<template>
+  <div class="hello">
+    <h1>{{ msg }}</h1>
+  </div>
+</template>
+
+<script>
+export default {
+  name: 'HelloWorld',
+  props: {
+    msg: String
+  }
+}
+</script>

frontend/src/eventsource/handlers/credits.js

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+import store from '@/store'
+
+export default {
+    handle(data) {
+        store.setCreditsAction(data.content)
+    }
+}

frontend/src/eventsource/handlers/index.js

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+import credits from './credits'
+
+var handlers = {
+    'credits': credits
+}
+
+export default {
+    handle(data) {
+        if(handlers[data.type]) {
+            handlers[data.type].handle(data)
+        }
+    }
+}

frontend/src/eventsource/index.js

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+import store from "../store"
+import handler from './handlers'
+
+var connection = null
+var onOpenCallback = null
+var onCloseCallback = null
+
+const eventSource = {
+    connect(channel) {
+        if(connection != null) {
+            connection.close();
+        }
+
+        connection = new EventSource('/feed/updates/' + channel)
+
+        connection.addEventListener("message", function(message) {
+            var data = JSON.parse(message.data)
+            handler.handle(data)
+            store.setRawMessageAction(message.data)
+        })
+
+        connection.addEventListener("open", function () {
+            if(typeof onOpenCallback === 'function') {
+                onOpenCallback()
+            }
+        })     
+        
+        connection.addEventListener("close", function () {
+            if(typeof onCloseCallback === 'function') {
+                onCloseCallback()
+            }
+        })     
+        
+        connection.addEventListener("error", function () {
+            if(connection.readyState !== EventSource.CONNECTING) {
+                if(typeof onCloseCallback === 'function') {
+                    onCloseCallback()
+                }
+            }
+        })
+    },
+    isConnected() {
+        return connection.readyState === EventSource.OPEN
+    },
+    isConnecting() {
+        return connection.readyState === EventSource.CONNECTING
+    },
+    onOpen(callback) {
+        onOpenCallback = callback
+    },
+    onClose(callback) {
+        onCloseCallback = callback
+    }
+}
+
+export default eventSource

frontend/src/main.js

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+import Vue from 'vue'
+import VueRouter from 'vue-router'
+import App from './App.vue'
+import store from './store'
+import router from './router'
+
+import './assets/main.scss'
+
+Vue.config.productionTip = false
+
+Vue.use(VueRouter)
+
+new Vue({
+  data: store.state,
+  router,
+  render: h => h(App)
+}).$mount('#app')

frontend/src/router/index.js

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+import Vue from 'vue'
+import VueRouter from 'vue-router'
+import Home from '../views/Home.vue'
+
+Vue.use(VueRouter)
+
+  const routes = [
+  {
+    path: '/:channel?',
+    name: 'Home',
+    component: Home
+  }
+//  {
+//    path: '/about',
+//    name: 'About',
+//    // route level code-splitting
+//    // this generates a separate chunk (about.[hash].js) for this route
+//    // which is lazy-loaded when the route is visited.
+//    component: () => import(/* webpackChunkName: "about" */ '../views/About.vue')
+//  }
+]
+
+const router = new VueRouter({
+  routes
+})
+
+export default router

frontend/src/store/index.js

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+const store = {
+    state: {
+        credits: 0,
+        message: 'Hello World!',
+    },
+    setCreditsAction(newValue) {
+        this.state.credits = newValue
+    },
+    setRawMessageAction(newValue) {
+        this.state.message = newValue
+    },
+    setMessageAction(newValue) {
+        this.state.message = newValue
+    },
+    clearMessageAction() {
+        this.state.message = ''
+    }
+}
+
+export default store

frontend/src/views/Home.vue

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+<template>
+  <div class="home">
+    <Connection v-bind:active="active" v-bind:channel="currentChannel" />
+    <HelloWorld v-bind:msg="message" />
+    <div>
+      Credits: {{ credits }}
+    </div>
+  </div>
+</template>
+
+<script>
+// @ is an alias to /src
+import HelloWorld from "@/components/HelloWorld.vue";
+import Connection from "@/components/Connection.vue";
+import eventSource from "@/eventsource";
+
+var connect = function (channel) {
+  if (channel != "undefined" && channel != data.currentChannel) {
+    data.currentChannel = channel;
+    eventSource.connect(channel);
+  }
+};
+
+var data = {
+  active: false,
+  currentChannel: "",
+};
+
+export default {
+  name: "Home",
+  data() {
+    return data;
+  },
+  computed: {
+    message() {
+      return this.$root.message;
+    },
+    credits() {
+      return this.$root.credits;
+    }
+  },
+  watch: {
+    $route(to) {
+      connect(to.params.channel);
+    },
+  },
+  created() {
+    eventSource.onOpen(function () {
+      data.active = true;
+    });
+    eventSource.onClose(function () {
+      data.active = false;
+    });
+    connect(this.$route.params.channel);
+  },
+  components: {
+    HelloWorld,
+    Connection,
+  },
+};
+</script>