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feat: durable file-backed persistence for walkie web UI #16

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feat: durable file-backed persistence for walkie web UI #16

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24 changes: 14 additions & 10 deletions src/web-ui.js
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Original file line number Diff line number Diff line change
Expand Up @@ -618,16 +618,18 @@ module.exports = `<!DOCTYPE html>
const state = snapshotState();
clearTimeout(saveTimer);
saveTimer = setTimeout(() => {
if (writeLocalState(state)) return;
// Write to durable server file first, fall back to localStorage
fetch('/state', {
method: 'PUT',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify(state)
}).catch(() => {});
})
.then(() => writeLocalState(state))
.catch(() => writeLocalState(state));
}, 500);
}

async function loadLegacyState() {
async function loadServerState() {
try {
const resp = await fetch('/state');
const state = await resp.json();
Expand All @@ -638,16 +640,18 @@ module.exports = `<!DOCTYPE html>
}

async function load() {
const localState = readLocalState();
if (localState) {
applyState(localState);
// Prefer durable server-side state (survives browser clears + restarts)
const serverState = await loadServerState();
if (serverState) {
applyState(serverState);
// keep a local copy for offline resilience
writeLocalState(snapshotState());
return;
}

const legacyState = await loadLegacyState();
if (legacyState) {
applyState(legacyState);
writeLocalState(snapshotState());
const localState = readLocalState();
if (localState) {
applyState(localState);
}
}

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13 changes: 12 additions & 1 deletion src/web.js
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Original file line number Diff line number Diff line change
Expand Up @@ -315,4 +315,15 @@ async function startWebServer({ port = 3000 } = {}) {
return { port: actualPort, close: () => server.close() }
}

module.exports = { startWebServer }
module.exports = {
startWebServer,
STATE_FILE,
readState: () => {
try { return JSON.parse(fs.readFileSync(STATE_FILE, 'utf8')) } catch { return {} }
},
writeState: (obj) => {
const dir = path.dirname(STATE_FILE)
fs.mkdirSync(dir, { recursive: true, mode: 0o700 })
fs.writeFileSync(STATE_FILE, JSON.stringify(obj, null, 2), { mode: 0o600 })
}
}