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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" type="text/css" href="../zen.css" />
<script src="../util/sanitize.js"></script>
<script src="../theme.js"></script>
<script src="../banner.js" defer></script>
<script src="../nav.js" defer></script>
<title>Zen Hub Dashboard</title>
</head>
<body>
<div class="container" style="max-width: 1400px; margin: 0 auto;">
<zen-banner cluster-status="nominal" subtitle="HUB" tagline="Overview" logo-src="../favicon.ico"></zen-banner>
<zen-nav>
<a href="/dashboard/">Home</a>
<a href="hub.html">Hub</a>
</zen-nav>
<div class="timestamp">Last updated: <span id="last-update">Never</span></div>
<div id="error-container"></div>
<div class="section-title">Capacity</div>
<div class="grid">
<div class="card">
<div class="card-title">Active Modules</div>
<div class="metric-value" id="instance-count">-</div>
<div class="metric-label">Currently provisioned</div>
</div>
<div class="card">
<div class="card-title">Peak Modules</div>
<div class="metric-value" id="max-instance-count">-</div>
<div class="metric-label">High watermark</div>
</div>
<div class="card">
<div class="card-title">Instance Limit</div>
<div class="metric-value" id="instance-limit">-</div>
<div class="metric-label">Maximum allowed</div>
<div class="progress-bar">
<div class="progress-fill" id="capacity-progress" style="width: 0%"></div>
</div>
</div>
</div>
<div class="section-title">Modules</div>
<div class="card">
<div class="card-title">Storage Server Instances</div>
<div id="empty-state" class="empty-state">No modules provisioned.</div>
<table id="module-table" style="display: none;">
<thead>
<tr>
<th>Module ID</th>
<th style="text-align: center;">Status</th>
</tr>
</thead>
<tbody id="module-table-body"></tbody>
</table>
</div>
</div>
<script>
const BASE_URL = window.location.origin;
const REFRESH_INTERVAL = 2000;
function showError(message) {
document.getElementById('error-container').innerHTML =
'<div class="error">Error: ' + escapeHtml(message) + '</div>';
}
function clearError() {
document.getElementById('error-container').innerHTML = '';
}
async function fetchJSON(endpoint) {
var response = await fetch(BASE_URL + endpoint, {
headers: { 'Accept': 'application/json' }
});
if (!response.ok) {
throw new Error('HTTP ' + response.status + ': ' + response.statusText);
}
return await response.json();
}
async function fetchStats() {
var data = await fetchJSON('/hub/stats');
var current = data.currentInstanceCount || 0;
var max = data.maxInstanceCount || 0;
var limit = data.instanceLimit || 0;
document.getElementById('instance-count').textContent = current;
document.getElementById('max-instance-count').textContent = max;
document.getElementById('instance-limit').textContent = limit;
var pct = limit > 0 ? (current / limit) * 100 : 0;
document.getElementById('capacity-progress').style.width = pct + '%';
var banner = document.querySelector('zen-banner');
if (current === 0) {
banner.setAttribute('cluster-status', 'nominal');
} else if (limit > 0 && current >= limit * 0.9) {
banner.setAttribute('cluster-status', 'degraded');
} else {
banner.setAttribute('cluster-status', 'nominal');
}
}
async function fetchModules() {
var data = await fetchJSON('/hub/status');
var modules = data.modules || [];
var emptyState = document.getElementById('empty-state');
var table = document.getElementById('module-table');
var tbody = document.getElementById('module-table-body');
if (modules.length === 0) {
emptyState.style.display = '';
table.style.display = 'none';
return;
}
emptyState.style.display = 'none';
table.style.display = '';
tbody.innerHTML = '';
for (var i = 0; i < modules.length; i++) {
var m = modules[i];
var moduleId = m.moduleId || '';
var state = m.state || 'unprovisioned';
var badge = (state === 'provisioned')
? '<span class="status-badge active">Provisioned</span>'
: '<span class="status-badge inactive">' + escapeHtml(state.charAt(0).toUpperCase() + state.slice(1)) + '</span>';
var tr = document.createElement('tr');
tr.innerHTML =
'<td style="font-family: monospace; font-size: 12px;">' + escapeHtml(moduleId) + '</td>' +
'<td style="text-align: center;">' + badge + '</td>';
tbody.appendChild(tr);
}
}
async function updateDashboard() {
var banner = document.querySelector('zen-banner');
try {
await Promise.all([
fetchStats(),
fetchModules()
]);
clearError();
document.getElementById('last-update').textContent = new Date().toLocaleTimeString();
} catch (error) {
console.error('Error updating dashboard:', error);
showError(error.message);
banner.setAttribute('cluster-status', 'offline');
}
}
updateDashboard();
setInterval(updateDashboard, REFRESH_INTERVAL);
</script>
</body>
</html>
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