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⚡ Bolt: eliminate redundant Buffer allocations in PersistenceLayer.save #445

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⚡ Bolt: eliminate redundant Buffer allocations in PersistenceLayer.save #445

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18 changes: 5 additions & 13 deletions src/os/persistence/PersistenceLayer.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -13,22 +13,14 @@ export class PersistenceLayer {
*/
save(data: any, key: string): Buffer {
const payload = JSON.stringify(data);
const payloadBuf = Buffer.from(payload, 'utf8');

// Bolt Optimization: Allocate unsafe buffer for exact combined size to avoid Buffer.concat and intermediate payload allocations
const outBuf = Buffer.allocUnsafe(38 + payloadBuf.length);

// Copy pre-allocated header and payload
outBuf.set(HEADER_BUF, 0);
outBuf.set(payloadBuf, 38);
const payloadByteLength = Buffer.byteLength(payload, 'utf8');

// Compute and write HMAC signature directly
const hmac = crypto.createHmac('sha256',. key);
hmac.update(payloadBuf);
// Bolt Optimization: Compute HMAC directly on payload string to avoid extra Buffer allocations
const hmac = crypto.createHmac('sha256', key);
hmac.update(payload, 'utf8');
const signature = hmac.digest();
outBuf.set(signature, 6);

const payloadByteLength = Buffer.byteLength(payload, 'utf8');
// Bolt Optimization: Allocate unsafe buffer for exact combined size to avoid Buffer.concat and intermediate payload allocations
const out = Buffer.allocUnsafe(HEADER_LENGTH + SIGNATURE_LENGTH + payloadByteLength);

// Zero-copy set of pre-allocated header
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