@next-boost/next-boost/dist/payload.js

Add a cache layer for next.js SSR pages. Use stale-while-revalidate to boost the performance.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.decodePayload = exports.encodePayload = void 0;
const MAGIC = Buffer.from('%NB%');
const LENGTH_SIZE = 4;
/**
 * Package the headers and body of a page to a binary format.
 * The format will be `%NB%` + length of the headers + headers + body.
 *
 * @param payload The page payload.
 * @returns The binary payload.
 */
function encodePayload({ headers, body }) {
    const headerBuffer = Buffer.from(JSON.stringify(headers));
    const headerLength = Buffer.alloc(LENGTH_SIZE);
    headerLength.writeUInt32BE(headerBuffer.length, 0);
    return Buffer.concat([MAGIC, headerLength, headerBuffer, body ? body : Buffer.alloc(0)]);
}
exports.encodePayload = encodePayload;
/**
 * Read the headers and body of a page from a binary payload.
 *
 * @param payload The binary payload.
 * @returns The page payload.
 */
function decodePayload(payload) {
    if (!payload)
        return { headers: {}, body: Buffer.alloc(0) };
    const magic = payload.slice(0, MAGIC.length);
    if (MAGIC.compare(magic) !== 0)
        throw new Error('Invalid payload');
    const headerLength = payload.readUInt32BE(MAGIC.length);
    const headerBuffer = payload.slice(MAGIC.length + LENGTH_SIZE, MAGIC.length + LENGTH_SIZE + headerLength);
    const headers = JSON.parse(headerBuffer.toString());
    const body = payload.slice(MAGIC.length + LENGTH_SIZE + headerLength);
    return { headers, body };
}
exports.decodePayload = decodePayload;