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feat(web): track negotiated SignalR transport in telemetry

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Long-poll 404s in dependency telemetry come from clients whose corporate
network blocks WebSockets. Emit the negotiated transport on connect and
reconnect so fallback sessions are attributable instead of mysterious.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Oliver Kieselbach
2026-07-29 11:25:05 +02:00
parent 946d503be0
commit cefa57fde5
1 changed files with 24 additions and 1 deletions
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src/Web/autopilot-monitor-web/contexts/SignalRContext.tsx
+24 -1
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@@ -22,6 +22,21 @@ interface SignalRContextType {
const SignalRContext = createContext<SignalRContextType | undefined>(undefined);
// The negotiated transport is not exposed by the public API. Sniff the internal transport
// object's fields instead of constructor.name, which production minification mangles;
// property names survive because bundlers do not mangle them. Verified against
// @microsoft/signalr 10.x internals.
function getTransportName(conn: signalR.HubConnection): string {
const transport = (conn as unknown as {
connection?: { transport?: Record<string, unknown> };
}).connection?.transport;
if (!transport) return 'Unknown';
if ('_webSocketConstructor' in transport || '_webSocket' in transport) return 'WebSockets';
if ('_eventSource' in transport) return 'ServerSentEvents';
if ('_pollAbort' in transport) return 'LongPolling';
return 'Unknown';
}
export function SignalRProvider({ children }: { children: React.ReactNode }) {
const { getAccessToken, isAuthenticated } = useAuth();
const [connection, setConnection] = useState<signalR.HubConnection | null>(null);
@@ -129,7 +144,11 @@ export function SignalRProvider({ children }: { children: React.ReactNode }) {
if (previousGroups.length > 0) {
console.log(`[SignalR] Rejoined ${joinedGroupsRef.current.size}/${previousGroups.length} groups after reconnect`);
}
trackEvent("signalr_reconnected", { rejoinedGroups: joinedGroupsRef.current.size, downtimeMs });
trackEvent("signalr_reconnected", {
rejoinedGroups: joinedGroupsRef.current.size,
downtimeMs,
transport: getTransportName(newConnection),
});
});
// Start connection
@@ -139,6 +158,10 @@ export function SignalRProvider({ children }: { children: React.ReactNode }) {
setConnectionState(signalR.HubConnectionState.Connected);
setConnection(newConnection);
retryCountRef.current = 0;
// Surfaces clients stuck on a fallback transport (e.g. corporate proxies blocking
// WebSockets) — those sessions get slower live updates and produce long-poll 404
// noise in dependency telemetry.
trackEvent("signalr_connected", { transport: getTransportName(newConnection) });
} catch (error) {
console.error('[SignalR] Failed to start connection:', error);
setConnectionState(signalR.HubConnectionState.Disconnected);