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allard
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Node Balancer</title>
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<style>
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html, body {
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margin: 0;
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padding: 0;
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min-height: 100%;
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}
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body { font-family: sans-serif; margin: 20px; }
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svg { border:1px solid #ccc; width:100%; background:#f9f9f9; }
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.node { fill:#4CAF50; stroke:#333; stroke-width:2; }
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.pod { fill:#2196F3; stroke:#000; stroke-width:1; }
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.label { font-size:14px; text-anchor:middle; dominant-baseline:middle; }
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.pod-label { font-size:14px; text-anchor:middle; fill:#fff; }
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header {
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display: flex;
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align-items: center;
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margin-bottom: 20px;
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background-color: #f0f0f0;
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padding: 10px 15px;
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border-radius: 8px;
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}
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header .logo {
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font-weight: bold;
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font-size: 18px;
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color: #2196F3;
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margin-right: 15px;
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padding: 5px 10px;
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background-color: #333;
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color: #fff;
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border-radius: 4px;
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font-family: monospace;
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}
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header .title {
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font-size: 18px;
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}
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header .title span {
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margin-left: 10px;
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color: #555;
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font-weight: normal;
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}
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header .cluster-label {
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margin-left: 20px;
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color: #333;
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font-weight: normal;
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}
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</style>
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</head>
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<body>
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<header>
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<div class="logo">allarddcs</div>
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<div class="title">
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Node Balancer <span id="version">v?</span>
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<span class="cluster-label">Cluster: <span id="cluster-name">?</span></span>
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</div>
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</header>
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<svg id="canvas"></svg>
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<script>
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const svg = document.getElementById("canvas");
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// Node/pod layout constants
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const nodePositions = {};
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const nodeY = 50;
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let nodeWidth = 120;
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const nodeHeight = 55;
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const podHeight = 48;
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const podSpacing = 6;
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const textPaddingY = 6;
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let animationDuration = 2000;
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const podsPerNode = {};
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// Fetch config
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fetch("/api/config")
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.then(res => res.json())
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.then(cfg => {
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animationDuration = cfg.animationDurationMs;
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document.getElementById("version").textContent = "v" + cfg.version;
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document.getElementById("cluster-name").textContent = cfg.clusterName;
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});
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// Remove trailing k8s-style hash if present
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function truncatePodName(podName) {
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const parts = podName.split("-");
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function isPodId(seg) { return /^[a-z0-9]{5}$/.test(seg); }
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function isReplicaSetHash(seg) { return /^[a-f0-9]{8,10}$/.test(seg); }
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if (parts.length > 1 && isPodId(parts[parts.length - 1])) parts.pop();
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if (parts.length > 1 && isReplicaSetHash(parts[parts.length - 1])) parts.pop();
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return parts.join("-");
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}
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// Split pod name into multiple lines
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function splitPodNameLines(podName, maxCharsPerLine = 16) {
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const parts = podName.split("-");
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const lines = [];
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let currentLine = "";
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for (let i = 0; i < parts.length; i++) {
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const part = parts[i];
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const isLastPart = i === parts.length - 1;
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if (currentLine.length === 0) {
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currentLine = part;
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continue;
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}
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const candidate = currentLine + "-" + part;
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if (candidate.length <= maxCharsPerLine) {
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currentLine = candidate;
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} else {
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// finalize current line with dash (since more parts follow)
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lines.push(currentLine + "-");
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currentLine = part;
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}
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}
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// last line never gets trailing dash
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if (currentLine.length > 0) {
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lines.push(currentLine);
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}
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return lines;
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}
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// Draw a node (responsive)
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function addNode(name, index, totalNodes){
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const svgWidth = svg.clientWidth || window.innerWidth;
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const outerPadding = 60; // distance from canvas edge
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const innerMargin = 20; // breathing space inside edges
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const usableWidth = svgWidth - 2 * outerPadding;
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const spacing = totalNodes > 1
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? usableWidth / totalNodes
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: 0;
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// Optional responsive node width scaling
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const maxNodeWidth = 120;
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const minNodeWidth = 60;
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nodeWidth = Math.max(minNodeWidth, Math.min(maxNodeWidth, spacing * 0.8));
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// Center nodes within their spacing slot
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const centerX = outerPadding + spacing * index + spacing / 2;
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const x = centerX - nodeWidth / 2;
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nodePositions[name] = {
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x: centerX,
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y: nodeY + nodeHeight/2
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};
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// Node rectangle
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const rect = document.createElementNS("http://www.w3.org/2000/svg","rect");
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rect.setAttribute("x", x);
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rect.setAttribute("y", nodeY);
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rect.setAttribute("width", nodeWidth);
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rect.setAttribute("height", nodeHeight);
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rect.setAttribute("class","node");
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svg.appendChild(rect);
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// Node label
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const label = document.createElementNS("http://www.w3.org/2000/svg","text");
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label.setAttribute("x", centerX);
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label.setAttribute("y", nodeY + nodeHeight/2);
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label.setAttribute("class","label");
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label.setAttribute("text-anchor","middle");
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label.setAttribute("dominant-baseline","middle");
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label.textContent = name;
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svg.appendChild(label);
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podsPerNode[name] = [];
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}
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// Add a pod
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function addPod(podName, nodeName){
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if(!nodePositions[nodeName]) return;
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const stack = podsPerNode[nodeName] || [];
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const index = stack.length;
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const x = nodePositions[nodeName].x - nodeWidth/2;
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// const y = nodeY + nodeHeight + index*(podHeight + podSpacing);
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const y = nodeY + nodeHeight + podSpacing + index * (podHeight + podSpacing);
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const g = document.createElementNS("http://www.w3.org/2000/svg","g");
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g.dataset.podName = podName;
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// Pod rectangle
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const rect = document.createElementNS("http://www.w3.org/2000/svg","rect");
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rect.setAttribute("x", x);
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rect.setAttribute("y", y);
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rect.setAttribute("width", nodeWidth);
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rect.setAttribute("height", podHeight);
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rect.setAttribute("class","pod");
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g.appendChild(rect);
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// Pod label
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const text = document.createElementNS("http://www.w3.org/2000/svg","text");
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text.setAttribute("class","pod-label");
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text.setAttribute("text-anchor","middle");
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text.setAttribute("x", x + nodeWidth/2);
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const truncated = truncatePodName(podName);
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const lines = splitPodNameLines(truncated, 14);
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if(lines.length === 1){
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// Single line: vertically centered
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text.setAttribute("y", y + podHeight/2 + textPaddingY/2);
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text.setAttribute("dominant-baseline","middle");
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text.textContent = lines[0];
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} else {
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// Multi-line
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const lineHeight = 12;
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const totalTextHeight = lines.length * lineHeight;
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// Center block vertically inside pod
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const startY = y + (podHeight - totalTextHeight)/2 + lineHeight - 2;
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text.setAttribute("y", startY);
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lines.forEach((line, i) => {
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const tspan = document.createElementNS("http://www.w3.org/2000/svg","tspan");
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tspan.setAttribute("x", x + nodeWidth/2);
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tspan.setAttribute("dy", i === 0 ? "0" : lineHeight);
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tspan.textContent = line;
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text.appendChild(tspan);
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});
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}
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g.appendChild(text);
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svg.appendChild(g);
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stack.push(g);
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podsPerNode[nodeName] = stack;
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updateSVGHeight();
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}
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// Update SVG height
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function updateSVGHeight() {
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let maxY = nodeY + nodeHeight;
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for(const nodeName in podsPerNode){
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const stack = podsPerNode[nodeName];
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if(!stack || stack.length===0) continue;
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const bottomY = nodeY + nodeHeight + stack.length*(podHeight + podSpacing);
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if(bottomY > maxY) maxY = bottomY;
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}
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svg.setAttribute("height", maxY + 20);
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}
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// Animate pod move
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function flyPod(podName, fromNode, toNode){
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if(!fromNode || !toNode) return;
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const fromStack = podsPerNode[fromNode];
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const idx = fromStack.findIndex(g => g.dataset.podName===podName);
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if(idx===-1) return;
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const g = fromStack[idx];
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fromStack.splice(idx,1);
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redrawPods(fromNode);
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svg.appendChild(g);
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const rect = g.querySelector("rect");
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const text = g.querySelector("text");
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const startX = parseFloat(rect.getAttribute("x"));
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const startY = parseFloat(rect.getAttribute("y"));
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const endX = nodePositions[toNode].x - nodeWidth/2;
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const endY = nodeY + nodeHeight + podsPerNode[toNode].length*(podHeight+podSpacing);
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let progress = 0;
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const steps = 60;
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const dx = (endX - startX)/steps;
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const dy = (endY - startY)/steps;
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const anim = setInterval(()=>{
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progress++;
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const nx = startX + dx*progress;
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const ny = startY + dy*progress;
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rect.setAttribute("x", nx);
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rect.setAttribute("y", ny);
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text.setAttribute("x", nx + nodeWidth/2);
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text.setAttribute("y", ny + podHeight/2 + textPaddingY/2);
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if(progress>=steps){
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clearInterval(anim);
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podsPerNode[toNode].push(g);
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redrawPods(toNode);
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}
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}, animationDuration/steps);
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}
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// Redraw pods on a node
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function redrawPods(nodeName){
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if(!podsPerNode[nodeName]) return;
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podsPerNode[nodeName].forEach((g,idx)=>{
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const rect = g.querySelector("rect");
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const text = g.querySelector("text");
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const x = nodePositions[nodeName].x - nodeWidth/2;
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const y = nodeY + nodeHeight + idx*(podHeight+podSpacing);
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rect.setAttribute("x", x);
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rect.setAttribute("y", y);
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text.setAttribute("x", x + nodeWidth/2);
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text.setAttribute("y", y + podHeight/2 + textPaddingY/2);
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});
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updateSVGHeight();
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}
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// Fetch authoritative cluster state and redraw
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function refreshCluster(){
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Promise.all([
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fetch("/api/nodes").then(r=>r.json()),
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fetch("/api/pods").then(r=>r.json())
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]).then(([nodeNames, podsByNode])=>{
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while(svg.firstChild) svg.removeChild(svg.firstChild);
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for(const k in nodePositions) delete nodePositions[k];
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for(const k in podsPerNode) delete podsPerNode[k];
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nodeNames.forEach((name,i)=>addNode(name,i,nodeNames.length));
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for(const nodeName in podsByNode){
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podsByNode[nodeName].forEach(podName=>addPod(podName,nodeName));
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}
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updateSVGHeight();
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});
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}
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// SSE events
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const evtSource = new EventSource("/api/stream");
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evtSource.onmessage = e=>{
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const evt = JSON.parse(e.data);
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if(evt.fromNode && evt.toNode && evt.fromNode !== evt.toNode){
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flyPod(evt.pod, evt.fromNode, evt.toNode);
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setTimeout(refreshCluster, animationDuration);
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} else {
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refreshCluster();
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}
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};
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// Periodic refresh every 5s
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setInterval(refreshCluster, 5000);
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// Responsive redraw on resize
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window.addEventListener("resize", refreshCluster);
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// Initial load
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refreshCluster();
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</script>
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</body>
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</html>
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Block a user