sendover/out/src/deriveKeyWithCache.js

Tools for creating and paying invoices privately on Bitcoin SV

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.deriveKeyWithCache = void 0;
const deriveKey_1 = require("./deriveKey");
// Global cache object to store the results of deriveKey function invocations
const deriveKeyCache = {};
/**
 * Generates a unique cache key based on the input parameters of the deriveKey function.
 * This function serializes the parameters into a string that can be used as a key in the cache object.
 *
 * @param {SendOverDeriveKeyParams} params - The input parameters to the deriveKey function.
 * @return {string} A unique string identifier based on the input parameters.
 */
function generateCacheKey(params) {
    const key = JSON.stringify(params, (key, value) => value instanceof Uint8Array ? Array.from(value) : value, 4);
    return key;
}
/**
 * Modified deriveKey function that utilizes a caching mechanism.
 * This function first checks if the result for the given parameters is already in the cache.
 * If so, it returns the cached result. Otherwise, it proceeds with the derivation and stores the result in the cache.
 *
 * @param {SendOverDeriveKeyParams} params - The input parameters for the key derivation.
 * @return {string} Hex string of the derived key.
 */
function deriveKeyWithCache(params) {
    // Generate a unique cache key for the current invocation parameters
    const cacheKey = generateCacheKey(params);
    // Check if the result is already cached
    if (cacheKey in deriveKeyCache) {
        return deriveKeyCache[cacheKey];
    }
    // Proceed with the original deriveKey logic to derive the key
    const result = (0, deriveKey_1.deriveKey)(params);
    // Store the result in the cache with the generated cache key
    deriveKeyCache[cacheKey] = result;
    return result;
}
exports.deriveKeyWithCache = deriveKeyWithCache;
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