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Show traffic on the lower branch after SDN failover #21

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Merged
sameermanvi merged 1 commit into from
Nov 4, 2026
Merged

Show traffic on the lower branch after SDN failover #21

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20 changes: 16 additions & 4 deletions scripts/visualizer/app.js
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Original file line number Diff line number Diff line change
Expand Up @@ -168,6 +168,7 @@ function reset(event) {

route = "upper";
broken.clear();
for (const branch of ["upper", "lower"]) $(branch).removeAttribute("stroke-dasharray");
seenMilestones.clear();
sampled = {};
firstRetry = null;
Expand Down Expand Up @@ -411,8 +412,15 @@ function ingest(e) {
e.view = { ...producer };
const local = sessionInfo.packets <= 32 && scenario < 5;
const recordedCut = scenario === 5;
// Keep a few actual sender events after the switch, even late in a large file.
if (recordedCut && e.event === "link_down") sampled.cutSeen = true;
if (recordedCut && sampled.cutSeen && e.event === "route_ready")
sampled.remainingSends = 3;
const afterSwitch = recordedCut && sampled.remainingSends > 0 &&
["send", "retransmit"].includes(e.event);
if (afterSwitch) { sampled.remainingSends--; e.afterSwitch = true; }
const keep = recordedCut
? [
? afterSwitch || [
"trial_metadata",
"link_down",
"route_ready",
Expand Down Expand Up @@ -644,8 +652,11 @@ function present(e) {
}
if (e.event === "link_down") {
const path =
(e.dpid === 1 && e.port === 3) || e.dpid === 3 ? "lower" : "upper";
(e.dpid === 1 && e.port === 3) || (e.dpid === 4 && e.port === 2) || e.dpid === 3 ? "lower" : "upper";
broken.add(path);
activeAnimation?.cancel();
$("packet").style.visibility = "hidden";
$(path).setAttribute("stroke-dasharray", "9 6");
$(path).setAttribute("stroke", "#f85149");
$("route-status").textContent = "LINK DOWN " + path;
say(
Expand Down Expand Up @@ -673,13 +684,14 @@ function present(e) {
$("sdn").textContent = JSON.stringify(latest, null, 2);
}
if (e.event === "recovery") {
packet("USEFUL ACK", false, true);
say(
"APPLICATION RECOVERED: First useful ACK after route readiness. Recorded link-down → useful ACK interval " +
e.link_down_to_ack_ms.toFixed(3) +
" ms. Playback pauses do not affect this measurement.",
);
$("route-status").textContent =
"RECOVERED " + e.link_down_to_ack_ms.toFixed(3) + " ms";
"ACK progress resumed via selected " + route + " branch · " + e.link_down_to_ack_ms.toFixed(3) + " ms";
}
if (e.event === "ack_progress" && scenario < 5 && scenario !== 2)
say(
Expand Down Expand Up @@ -984,7 +996,7 @@ setInterval(() => {
].includes(milestone);
const hold = slow && important && !seenMilestones.has(milestone);
if (hold) seenMilestones.add(milestone);
nextAt = performance.now() + (hold || pivotal(e) ? 1200 : 120);
nextAt = performance.now() + (hold || pivotal(e) ? 1200 : e.afterSwitch ? 750 : 120);
}, 20);
setInterval(renderRaw, 500);
$("filter").oninput = renderRaw;
Expand Down
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