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72bc11813d ... 017d489e2e

Author SHA1 Message Date
M1 017d489e2e fix: mutate polyline points in place on SSE ping, no fetch, no flicker 2026-03-17 07:44:09 +04:00
M1 2c32bc1115 Revert "fix: client-side sparkline with local buffer, no server fetch on update" 
This reverts commit 72bc11813d.
 2026-03-17 07:42:36 +04:00
2 changed files with 24 additions and 43 deletions
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2
apps/web/src/utils/sparkline.ts
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@ -9,5 +9,5 @@ export function sparkline(values: number[], width = 120, height = 32): string {
const y = height - ((v - min) / range) * (height - 4) - 2;
return `${x},${y}`;
}).join(' ');
return `<svg width="${width}" height="${height}" class="inline-block"><polyline points="${points}" fill="none" stroke="#60a5fa" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/></svg>`;
return `<svg width="${width}" height="${height}" class="inline-block" data-vals="${values.join(',')}"><polyline points="${points}" fill="none" stroke="#60a5fa" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/></svg>`;
}

65
apps/web/src/views/home.ejs
View File

@ -75,43 +75,7 @@
} catch {}
}, 30000);
// Client-side sparkline — seed with SSR data, update locally on SSE
const _sparkData = {
<% it.monitors.forEach(function(m, i) {
const lats = (m.pings || []).filter(p => p.latency_ms != null).map(p => p.latency_ms);
%>'<%= m.id %>': [<%- lats.join(',') %>]<% if (i < it.monitors.length - 1) { %>,<% } %>
<% }) %>
};
function drawSparkline(values, el) {
const W = 120, H = 32;
if (!values.length) { el.innerHTML = ''; return; }
const max = Math.max(...values, 1);
const min = Math.min(...values, 0);
const range = max - min || 1;
const step = W / Math.max(values.length - 1, 1);
const pts = values.map((v, i) => {
const x = i * step;
const y = H - ((v - min) / range) * (H - 4) - 2;
return `${x},${y}`;
}).join(' ');
const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
svg.setAttribute('viewBox', `0 0 ${W} ${H}`);
svg.setAttribute('width', W);
svg.setAttribute('height', H);
const pl = document.createElementNS('http://www.w3.org/2000/svg', 'polyline');
pl.setAttribute('points', pts);
pl.setAttribute('fill', 'none');
pl.setAttribute('stroke', '#60a5fa');
pl.setAttribute('stroke-width', '1.5');
pl.setAttribute('stroke-linecap', 'round');
pl.setAttribute('stroke-linejoin', 'round');
svg.appendChild(pl);
const old = el.querySelector('svg');
if (old) old.replaceWith(svg); else el.appendChild(svg);
}
// SSE: update cards in realtime
// SSE: on each ping, update text fields and redraw sparkline in place
watchAccount((ping) => {
const card = document.querySelector(`[data-monitor-id="${ping.monitor_id}"]`);
if (!card) return;
@ -124,13 +88,30 @@
if (ping.latency_ms != null) card.querySelector('.stat-latency').textContent = ping.latency_ms + 'ms';
card.querySelector('.stat-last').innerHTML = timeAgo(ping.checked_at);
// Sparkline — update buffer and redraw locally
// Sparkline — append point to existing polyline, drop oldest, no refetch
if (ping.latency_ms != null) {
const buf = _sparkData[ping.monitor_id] = _sparkData[ping.monitor_id] || [];
buf.push(ping.latency_ms);
if (buf.length > 20) buf.shift();
const sparkEl = card.querySelector('.stat-sparkline');
if (sparkEl) drawSparkline(buf, sparkEl);
const polyline = sparkEl?.querySelector('polyline');
if (polyline) {
const pts = polyline.getAttribute('points').trim().split(' ').filter(Boolean);
const W = 120, H = 32;
// Parse existing points
let coords = pts.map(p => p.split(',').map(Number));
// Extract just y-values (latencies are encoded in y relative to scale)
// Easier: maintain a data attr on the svg with the raw values
const svg = sparkEl.querySelector('svg');
let vals = svg?.dataset.vals ? svg.dataset.vals.split(',').map(Number) : [];
vals.push(ping.latency_ms);
if (vals.length > 20) vals.shift();
if (svg) svg.dataset.vals = vals.join(',');
// Redraw polyline in place
const max = Math.max(...vals, 1);
const min = Math.min(...vals, 0);
const range = max - min || 1;
const step = W / Math.max(vals.length - 1, 1);
const newPts = vals.map((v, i) => `${i * step},${H - ((v - min) / range) * (H - 4) - 2}`).join(' ');
polyline.setAttribute('points', newPts);
}
}
});
</script>