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🧹 [Code Health] Implement Secure Telemetry Fallback Mechanism #13

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🧹 [Code Health] Implement Secure Telemetry Fallback Mechanism #13

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8 changes: 5 additions & 3 deletions code/experiment.js
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Original file line number Diff line number Diff line change
Expand Up @@ -473,9 +473,11 @@ async function executeBatchPayload() {
setTimeout(onSyncSuccess, 1500); // Simulate sync delay
}
} catch (error) {
console.error("Critical Sync Failure:", error);
DOM.syncStatus.innerHTML = `<span style="color:#ff453a">⚠️ Sync Failed. Error: ${error.code || 'Network'}</span>`;
// Potential fallback: Save to localStorage for later recovery
// Fallback: Save to localStorage for later recovery
localStorage.setItem(`telemetry_backup_${STATE.pid}`, JSON.stringify(STATE.results));

@gemini-code-assist gemini-code-assist Bot Mar 12, 2026

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high

The localStorage.setItem call can throw an exception if storage is full or disabled (e.g., in private browsing mode). This would interrupt the catch block and prevent the user from seeing the final status message. To make the error handling more robust, this operation should be wrapped in its own try...catch block to ensure the UI is always updated, even if the data backup fails.

        try {
            localStorage.setItem(`telemetry_backup_${STATE.pid}`, JSON.stringify(STATE.results));
        } catch (storageError) {
            // Silently fail if localStorage is not available to ensure the UI message is shown.
        }

Comment on lines +476 to +477

Copilot AI Mar 12, 2026

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This fallback persists a new telemetry_backup_${STATE.pid} entry but there’s no cleanup or indexing; repeated failures can accumulate orphaned payloads in localStorage and eventually cause quota issues, and recovery is harder because the PID isn’t surfaced when sync fails. Consider adding a bounded retention strategy (e.g., store an index/timestamp, cap number of backups) and removing the backup once a later sync succeeds.

Copilot uses AI. Check for mistakes.

DOM.syncStatus.style.color = "#ff453a";
DOM.syncStatus.textContent = "Diagnostic Complete. A network timeout occurred. You may safely close this tab.";
Comment on lines +479 to +480

@gemini-code-assist gemini-code-assist Bot Mar 12, 2026

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medium

The color string #ff453a and the UI message are hardcoded. To improve maintainability and avoid "magic values," consider defining these as constants at a higher scope (e.g., in the CFG object at the top of the file). This makes them easier to find, update, and ensures consistency if they are used elsewhere.

Comment on lines +476 to +480

Copilot AI Mar 12, 2026

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localStorage.setItem(...) can throw (e.g., QuotaExceededError, storage disabled/private mode). Since this is inside the catch, a thrown storage error would escape and prevent the user-facing status update, defeating the fallback. Wrap the localStorage write in its own try/catch and ensure the UI message is still shown even if persistence fails (optionally showing a different message when storage is unavailable).

Suggested change
// Fallback: Save to localStorage for later recovery
localStorage.setItem(`telemetry_backup_${STATE.pid}`, JSON.stringify(STATE.results));
DOM.syncStatus.style.color = "#ff453a";
DOM.syncStatus.textContent = "Diagnostic Complete. A network timeout occurred. You may safely close this tab.";
// Fallback: Attempt to save to localStorage for later recovery
let message = "Diagnostic Complete. A network timeout occurred. You may safely close this tab.";
try {
localStorage.setItem(`telemetry_backup_${STATE.pid}`, JSON.stringify(STATE.results));
} catch (storageError) {
console.warn("Unable to persist telemetry backup to localStorage:", storageError);
message = "Diagnostic Complete. A network timeout occurred and local backup could not be saved. You may safely close this tab.";
}
DOM.syncStatus.style.color = "#ff453a";
DOM.syncStatus.textContent = message;

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}
}

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