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fix: cache OpenAPI spec in sessionStorage to avoid fetch on every mount #673

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fix: cache OpenAPI spec in sessionStorage to avoid fetch on every mount #673

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31 changes: 31 additions & 0 deletions frontend/src/pages/Developer.jsx
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Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,28 @@ export default function Developer() {

async function loadOpenApi() {
try {
// Cache hit: the spec is unlikely to change during a session (Issue #580).
const cacheKey = `cp_openapi_spec_${V1_API_BASE}`;
const cachedRaw = sessionStorage.getItem(cacheKey);
if (cachedRaw) {
try {
const cached = JSON.parse(cachedRaw);
if (Array.isArray(cached) && cached.length > 0) {
setV1Endpoints(cached);
const saved = localStorage.getItem('cp_explorer_endpoint');
if (saved && cached.find((e) => e.id === saved)) {
setExplorerEndpoint(saved);
} else if (cached.length > 0) {
setExplorerEndpoint(cached[0].id);
}
return;
}
} catch {
// Corrupted cache — silently re-fetch.
sessionStorage.removeItem(cacheKey);
}
}

const res = await fetch(`${V1_API_BASE}/docs/openapi.json`);
if (!res.ok) throw new Error('Failed to fetch OpenAPI spec');
const spec = await res.json();
Expand Down Expand Up @@ -100,6 +122,15 @@ export default function Developer() {
}
setV1Endpoints(endpoints);

// Cache the parsed endpoints in sessionStorage so subsequent mounts
// skip the network roundtrip (Issue #580).
try {
sessionStorage.setItem(cacheKey, JSON.stringify(endpoints));
} catch {
// Storage full or unavailable — non-critical, the endpoints are already
// in component state.
}

const saved = localStorage.getItem('cp_explorer_endpoint');
if (saved && endpoints.find((e) => e.id === saved)) {
setExplorerEndpoint(saved);
Expand Down