Add uptime nunjuck filter

lib/nunjuck-filters.js

@@ -1,7 +1,36 @@
 const prettyBytes = require('pretty-bytes');
+const moment      = require('moment');
 
 const filters = {
-  bandwidth: node => `${prettyBytes(node.advertised_bandwidth)}/s`
+  bandwidth: node => `${prettyBytes(node.advertised_bandwidth)}/s`,
+  uptime: node => {
+
+    // Check node is up
+    if(!node.running) {
+      return 'Down';
+    }
+
+    // Check uptime
+    const lastRestarted = moment.utc(node.last_restarted);
+    const diff = moment.utc().diff(lastRestarted);
+    const uptime = {};
+
+    uptime.s = Math.round(diff / 1000);
+    uptime.m = Math.floor(uptime.s / 60);
+    uptime.h = Math.floor(uptime.m / 60);
+    uptime.d = Math.floor(uptime.h / 24);
+
+    uptime.s %= 60;
+    uptime.m %= 60;
+    uptime.h %= 24;
+
+    let readableUptime = '';
+    readableUptime += uptime.d ? ` ${uptime.d}d` : '';
+    readableUptime += uptime.h ? ` ${uptime.h}h` : '';
+    readableUptime += !uptime.d && uptime.m ? ` ${uptime.m}m` : '';
+
+    return readableUptime.trim();
+  }
 };
 
 module.exports = app => Object.keys(filters).forEach(filter => {

package.json

@@ -5,6 +5,7 @@
   "main": "index.js",
   "dependencies": {
     "express": "^4.14.0",
+    "moment": "^2.14.1",
     "nunjucks": "^2.4.2",
     "onionoo": "^0.3.1",
     "pretty-bytes": "^4.0.2"

views/listing.html

@@ -17,7 +17,7 @@
     <tr>
       <td><a href="/node/{{ node.fingerprint if node.fingerprint else node.hashed_fingerprint }}">{{ node.nickname }}</a></td>
       <td>{{ node | bandwidth }}</td>
-      <td>{{ node.last_restarted if node.running else 'Down' }}</td>
+      <td>{{ node | uptime }}</td>
       <td>{{ node.country_name }}</td>
       <td>{{ node.flags | join(', ') }}</td>
       <td>{{ node.type | title }}</td>