386 lines
14 KiB
JavaScript
386 lines
14 KiB
JavaScript
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'use strict';
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import {Component, h, html, render, useEffect, useState, useRef} from './preact.min.js';
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var devaddr = "address:port";
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const MaxMetricsDataPoints = 50;
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// This simple publish/subscribe is used to pass notifications that were
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// received from the server, to all child components of the app.
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var PubSub = (function() {
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var handlers = {}, id = 0;
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return {
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subscribe: function(fn) {
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handlers[id++] = fn;
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},
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unsubscribe: function(id) {
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delete handlers[id];
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},
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publish: function(data) {
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for (var k in handlers) handlers[k](data);
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}
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};
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})();
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const Nav = props => html`
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<div style="background: #333; padding: 0.5em; color: #fff;">
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<div class="container d-flex">
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<div style="flex: 1 1 auto; display: flex; align-items: center;">
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<b>Your Product</b>
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</div>
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<div style="display: flex; align-items: center; flex: 0 0 auto; ">
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<span>Logged in as:</span>
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<span style="padding: 0 0.5em;"><img src="user.png" height="22" /></span>
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<span>${props.user}</span>
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<a class="btn" onclick=${props.logout}
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style="margin-left: 1em; font-size: 0.8em; background: #8aa;">logout</a>
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</div>
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</div>
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</div>`;
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const Hero = props => html`
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<div class="section">
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<div style="margin-top: 1em; background: #eee; padding: 1em; border-radius: 0.5em; color: #777; ">
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<h1 style="margin: 0.2em 0;">Interactive Device Dashboard</h1>
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<p>
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This device dashboard is developed using the modern and compact Preact framework,
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in order to fit on very small devices. This is
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a <a href="https://mongoose.ws/tutorials/http-server/">hybrid server</a> which
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provides both static and dynamic content. Static files, like CSS/JS/HTML
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or images, are compiled into the server binary.
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This UI uses the REST API implemented by the device, which you can examine
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using <code>curl</code> command-line utility:
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</p>
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<div><code>curl -u admin:pass0 ${devaddr}/api/config/get</code> </div>
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<div><code>curl -u admin:pass0 ${devaddr}/api/config/set -d 'pub=mg/topic'</code> </div>
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<div><code>curl -u admin:pass0 ${devaddr}/api/message/send -d 'message=hello'</code> </div>
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<p>
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The device can send notifications to this dashboard at anytime. Notifications
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are sent over WebSocket at URI <code>/api/watch</code> as JSON strings: <code>{"name": "..", "data": ...}</code>
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<div>Try <code>wscat --auth user1:pass1 --connect ws://${devaddr}/api/watch</code></div>
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</p>
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</div>
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</div>`;
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const Login = function(props) {
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const [user, setUser] = useState('');
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const [pass, setPass] = useState('');
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const login = ev =>
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fetch(
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'/api/login',
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{headers: {Authorization: 'Basic ' + btoa(user + ':' + pass)}})
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.then(r => r.json())
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.then(r => r && props.login(r))
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.catch(err => err);
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return html`
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<div class="rounded border" style="max-width: 480px; margin: 0 auto; margin-top: 5em; background: #eee; ">
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<div style="padding: 2em; ">
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<h1 style="color: #666;">Device Dashboard Login </h1>
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<div style="margin: 0.5em 0;">
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<input type='text' placeholder='Name' style="width: 100%;"
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oninput=${ev => setUser(ev.target.value)} value=${user} />
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</div>
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<div style="margin: 0.5em 0;">
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<input type="password" placeholder="Password" style="width: 100%;"
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oninput=${ev => setPass(ev.target.value)} value=${pass}
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onchange=${login} />
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</div>
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<div style="margin: 1em 0;">
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<button class="btn" style="width: 100%; background: #8aa;"
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disabled=${!user || !pass} onclick=${login}> Login </button>
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</div>
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<div style="color: #777; margin-top: 2em;">
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Valid logins: admin:pass0, user1:pass1, user2:pass2
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</div>
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</div>
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</div>`;
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};
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const Configuration = function(props) {
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const [url, setUrl] = useState(props.config.url || '');
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const [pub, setPub] = useState(props.config.pub || '');
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const [sub, setSub] = useState(props.config.sub || '');
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useEffect(() => {
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setUrl(props.config.url);
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setPub(props.config.pub);
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setSub(props.config.sub);
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}, [props.config]);
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const update = (name, val) => fetch('/api/config/set', {
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method: 'post',
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body: `${name}=${encodeURIComponent(val)}`
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}).catch(err => err);
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const updateurl = ev => update('url', url);
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const updatepub = ev => update('pub', pub);
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const updatesub = ev => update('sub', sub);
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// console.log(props, [url, pub, sub]);
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return html`
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<div class="section">
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<h3 style="background: #c03434; color: #fff; padding: 0.4em;">
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Device Configuration</h3>
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<div style="margin: 0.5em 0; display: flex;">
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<span class="addon nowrap">MQTT server:</span>
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<input type="text" style="flex: 1 100%;"
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value=${url} onchange=${updateurl}
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oninput=${ev => setUrl(ev.target.value)} />
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<button class="btn" disabled=${!url} onclick=${updateurl}
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style="margin-left: 1em; background: #8aa;">Update</button>
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</div>
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<div style="margin: 0.5em 0; display: flex; ">
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<span class="addon nowrap">Subscribe topic:</span>
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<input type="text" style="flex: 1 100%;"
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value=${sub} onchange=${updatesub}
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oninput=${ev => setSub(ev.target.value)} />
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<button class="btn" disabled=${!sub} onclick=${updatesub}
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style="margin-left: 1em; background: #8aa;">Update</button>
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</div>
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<div style="margin: 0.5em 0; display: flex;">
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<span class="addon nowrap">Publish topic:</span>
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<input type="text" style="flex: 1 100%;"
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value=${pub} onchange=${updatepub}
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oninput=${ev => setPub(ev.target.value)} />
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<button class="btn" disabled=${!pub} onclick=${updatepub}
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style="margin-left: 1em; background: #8aa;">Update</button>
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</div>
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<div>
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You can use <a href="http://www.hivemq.com/demos/websocket-client/">
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HiveMQ Websocket web client</a> to send messages to this console.
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</div>
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<div class="msg">
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The device keeps a persistent connection to the configured MQTT server.
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Changes to this configuration are propagated to all dashboards: try
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changing them in this dashboard and observe changes in other opened
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dashboards.
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</div><div class="msg">
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Note: administrators can see this section and can change device
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configuration, whilst users cannot.
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</div>
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</div>`;
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};
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const Message = m => html`<div style="margin: 0.5em 0;">
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<span class="qos">qos: ${m.message.qos} </span>
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<span class="topic">topic: ${m.message.topic} </span>
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<span class="data">data: ${m.message.data}</span>
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</div>`;
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const Messages = function(props) {
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const [messages, setMessages] = useState([]);
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const [txt, setTxt] = useState('');
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useEffect(() => {
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const id = PubSub.subscribe(function(msg) {
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if (msg.name == 'message') setMessages(x => x.concat([msg.data]));
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});
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return PubSub.unsubscribe(id);
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}, []);
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const sendmessage = ev => fetch('/api/message/send', {
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method: 'post',
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body: `message=${encodeURIComponent(txt)}`
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}).then(r => setTxt(''));
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const routing = "connected" in props.config;
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const connstatus = !routing ? 'This device has no MQTT functionality' : props.config.connected ? 'connected' : 'disconnected';
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return html`
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<div class="section">
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<h3 style="background: #30c040; color: #fff; padding: 0.4em;">MQTT messages</h3>
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<div>
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MQTT server status: <b>${connstatus}</b>
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</div>
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<div style="height: 10em; overflow: auto; padding: 0.5em; " class="border">
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${messages.map(message => h(Message, {message}))}
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</div>
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<div style="margin: 0.5em 0; display: flex">
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<span class="addon nowrap">Publish message:</span>
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<input placeholder="type and press enter..." style="flex: 1 100%;"
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value=${txt} onchange=${sendmessage} disabled=${!routing}
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oninput=${ev => setTxt(ev.target.value)} />
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</div>
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<div class="msg">
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The message gets passed to the device via REST. Then the device sends it to
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the MQTT server over MQTT. All MQTT messages on a subscribed topic
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received by the device, are propagated to this dashboard via /api/watch.
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</div>
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</div>`;
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};
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// Expected arguments:
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// data: timeseries, e.g. [ [1654361352, 19], [1654361353, 18], ... ]
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// width, height, yticks, xticks, ymin, ymax, xmin, xmax
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const SVG = function(props) {
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// w
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// +---------------------+
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// | h1 |
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// | +-----------+ |
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// | | | | h
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// | w1 | | w2 |
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// | +-----------+ |
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// | h2 |
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// +---------------------+
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//
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let w = props.width, h = props.height, w1 = 30, w2 = 0, h1 = 8, h2 = 18;
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let yticks = props.yticks || 4, xticks = props.xticks || 5;
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let data = props.data || [];
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let ymin = props.ymin || 0;
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let ymax = props.ymax || Math.max.apply(null, data.map(p => p[1]));
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let xmin = props.xmin || Math.min.apply(null, data.map(p => p[0]));
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let xmax = props.xmax || Math.max.apply(null, data.map(p => p[0]));
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// Y-axis tick lines and labels
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let yta = (new Array(yticks + 1)).fill(0).map((_, i) => i); // indices
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let yti = i => h - h2 - (h - h1 - h2) * i / yticks; // index's Y
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let ytv = i => (ymax - ymin) * i / yticks;
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let ytl = y => html`<line x1=${w1} y1=${y} x2=${w} y2=${y} class="tick"/>`;
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let ytt = (y, v) => html`<text x=0 y=${y + 5} class="label">${v}</text>`;
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// X-axis tick lines and labels
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let datefmt = unix => (new Date(unix * 1000)).toISOString().substr(14, 5);
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let xta = (new Array(xticks + 1)).fill(0).map((_, i) => i); // indices
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let xti = i => w1 + (w - w1 - w2) * i / xticks; // index's X
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let xtv = i => datefmt(xmin + (xmax - xmin) * i / xticks);
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let xtl = x => html`<path d="M ${x},${h1} L ${x},${h - h2}" class="tick"/>`;
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let xtt = (x, v) =>
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html`<text x=${x - 15} y=${h - 2} class="label">${v}</text>`;
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// Transform data points array into coordinate
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let dx = v => w1 + (v - xmin) / ((xmax - xmin) || 1) * (w - w1 - w2);
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let dy = v => h - h2 - (v - ymin) / ((ymax - ymin) || 1) * (h - h1 - h2);
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let dd = data.map(p => [Math.round(dx(p[0])), Math.round(dy(p[1]))]);
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let ddl = dd.length;
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// And plot the data as <path> element
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let begin0 = ddl ? `M ${dd[0][0]},${dd[0][1]}` : `M 0,0`;
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let begin = `M ${w1},${h - h2}`; // Initial point
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let end = ddl ? `L ${dd[ddl - 1][0]},${h - h2}` : `L ${w1},${h - h2}`;
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let series = ddl ? dd.map(p => `L ${p[0]} ${p[1]}`) : [];
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return html`
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<svg viewBox="0 0 ${w} ${h}">
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<style>
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.axis { stroke: #aaa; fill: none; }
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.label { stroke: #aaa; font-size: 13px; }
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.tick { stroke: #ccc; fill: none; stroke-dasharray: 5; }
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.seriesbg { stroke: none; fill: rgba(200,225,255, 0.25)}
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.series { stroke: #25a; fill: none; }
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</style>
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${yta.map(i => ytl(yti(i)))}
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${yta.map(i => ytt(yti(i), ytv(i)))}
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${xta.map(i => xtl(xti(i)))}
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${data.length ? xta.map(i => xtt(xti(i), xtv(i))) : ''}
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<path d="${begin} ${series.join(' ')} ${end}" class="seriesbg" />
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<path d="${begin0} ${series.join(' ')}" class="series" />
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</svg>`;
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};
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const Chart = function(props) {
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const [data, setData] = useState([]);
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useEffect(() => {
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const id = PubSub.subscribe(function(msg) {
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if (msg.name != 'metrics') return;
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setData(x => x.concat([msg.data]).splice(-MaxMetricsDataPoints));
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});
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return PubSub.unsubscribe(id);
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}, []);
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let xmax = 0, missing = MaxMetricsDataPoints - data.length;
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if (missing > 0) xmax = Math.round(Date.now() / 1000) + missing;
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return html`
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<div class="section">
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<h3 style="background: #ec3; color: #fff; padding: 0.4em;">Data Chart</h3>
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<div style="overflow: auto; padding: 0.5em;" class="">
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<${SVG} height=240 width=600 ymin=0 ymax=20 xmax=${xmax} data=${data} />
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</div>
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<div class="msg">
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This chart plots live sensor data, sent by the device via /api/watch.
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</div>
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</div>`;
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};
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const App = function(props) {
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const [user, setUser] = useState('');
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const [config, setConfig] = useState({});
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const getconfig = () =>
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fetch('/api/config/get', {headers: {Authorization: ''}})
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.then(r => r.json())
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.then(r => setConfig(r))
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.catch(err => console.log(err));
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// Watch for notifications. As soon as a notification arrives, pass it on
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// to all subscribed components
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const watch = function() {
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var l = window.location, proto = l.protocol.replace('http', 'ws');
|
||
|
|
var tid, wsURI = proto + '//' + l.host + '/api/watch'
|
||
|
|
var reconnect = function() {
|
||
|
|
var ws = new WebSocket(wsURI);
|
||
|
|
// ws.onopen = () => console.log('ws connected');
|
||
|
|
ws.onmessage = function(ev) {
|
||
|
|
try {
|
||
|
|
var msg = JSON.parse(ev.data);
|
||
|
|
PubSub.publish(msg);
|
||
|
|
// if (msg.name != 'metrics') console.log('ws->', msg);
|
||
|
|
} catch (e) {
|
||
|
|
console.log('Invalid ws frame:', ev.data); // eslint-disable-line
|
||
|
|
}
|
||
|
|
};
|
||
|
|
ws.onclose = function() {
|
||
|
|
clearTimeout(tid);
|
||
|
|
tid = setTimeout(reconnect, 1000);
|
||
|
|
console.log('ws disconnected');
|
||
|
|
};
|
||
|
|
};
|
||
|
|
reconnect();
|
||
|
|
};
|
||
|
|
|
||
|
|
const login = function(u) {
|
||
|
|
document.cookie = `access_token=${u.token}; Secure, HttpOnly; SameSite=Lax; path=/; max-age=3600`;
|
||
|
|
setUser(u.user);
|
||
|
|
if (location.search.substring(1) == 'nows') {
|
||
|
|
// If query string is ?nows, then do not connect to websocket. For debug.
|
||
|
|
} else {
|
||
|
|
watch(); // Connect to websocket, receive constant graph updates
|
||
|
|
}
|
||
|
|
return getconfig();
|
||
|
|
};
|
||
|
|
|
||
|
|
const logout = ev => {
|
||
|
|
document.cookie = `access_token=; Secure, HttpOnly; SameSite=Lax; path=/; max-age=0`;
|
||
|
|
setUser('');
|
||
|
|
};
|
||
|
|
|
||
|
|
useEffect(() => {
|
||
|
|
// Called once at init time
|
||
|
|
PubSub.subscribe(msg => msg.name == 'config' && getconfig());
|
||
|
|
fetch('/api/login', {headers: {Authorization: ''}})
|
||
|
|
.then(r => r.json())
|
||
|
|
.then(r => login(r))
|
||
|
|
.catch(err => setUser(''));
|
||
|
|
}, []);
|
||
|
|
|
||
|
|
if (!user) return html`<${Login} login=${login} />`;
|
||
|
|
|
||
|
|
return html`
|
||
|
|
<${Nav} user=${user} logout=${logout} />
|
||
|
|
<div class="container">
|
||
|
|
<div class="row">
|
||
|
|
<div class="col col-6"><${Hero} /></div>
|
||
|
|
<div class="col col-6"><${Chart} /></div>
|
||
|
|
<div class="col col-6">
|
||
|
|
${user == 'admin' && h(Configuration, {config})}
|
||
|
|
</div>
|
||
|
|
<div class="col col-6"><${Messages} config=${config} /></div>
|
||
|
|
</div>
|
||
|
|
</div>`;
|
||
|
|
};
|
||
|
|
|
||
|
|
window.onload = () => render(h(App), document.body);
|