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⚡ Implement in-memory caching for TTS API #25

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⚡ Implement in-memory caching for TTS API #25

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18 changes: 18 additions & 0 deletions api/proxy-voice.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,11 @@ interface RequestBody {
text: string;
}

// Simple in-memory cache to prevent redundant expensive API calls
// This persists across warm lambda invocations
const CACHE_LIMIT = 50;
const voiceCache = new Map<string, string>();

export default async function handler(req: VercelRequest, res: VercelResponse) {
// CORS headers
res.setHeader('Access-Control-Allow-Origin', '*');
Expand Down Expand Up @@ -38,6 +43,12 @@ export default async function handler(req: VercelRequest, res: VercelResponse) {
return res.status(400).json({ error: 'INVALID_PAYLOAD: Text required' });
}

// Check cache
if (voiceCache.has(text)) {
// console.log('[DEFRAG] TTS Cache Hit'); // Optional debug logging
return res.status(200).json({ audio: voiceCache.get(text) });
}

const ai = new GoogleGenAI({ apiKey });

const response = await ai.models.generateContent({
Expand All @@ -63,6 +74,13 @@ export default async function handler(req: VercelRequest, res: VercelResponse) {
return res.status(500).json({ error: 'TTS_GENERATION_FAILED' });
}

// Cache the result
if (voiceCache.size >= CACHE_LIMIT) {
const firstKey = voiceCache.keys().next().value;
if (firstKey) voiceCache.delete(firstKey);
}
voiceCache.set(text, base64Audio);

return res.status(200).json({ audio: base64Audio });

} catch (error: any) {
Expand Down