@imqueue/pg-pubsub/src/helpers.js

Reliable PostgreSQL LISTEN/NOTIFY with inter-process lock support

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.pack = pack;
exports.unpack = unpack;
exports.signature = signature;
const farmhash_1 = require("farmhash");
/**
 * Performs JSON.stringify on a given input taking into account
 * pretty flag.
 *
 * @access private
 * @param {AnyJson} input - serializable value
 * @param {boolean} [pretty] - serialized format output prettify flag
 * @return {string}
 */
function stringify(input, pretty) {
    return pretty
        ? JSON.stringify(input, null, 2)
        : JSON.stringify(input);
}
/**
 * Serializes given input object to JSON string. On error will return
 * serialized null value
 *
 * @param {AnyJson} input - serializable value
 * @param {AnyLogger} [logger] - logger to handle errors logging with
 * @param {boolean} [pretty] - serialized format output prettify flag
 * @return {string}
 */
function pack(input, logger, pretty = false) {
    if (typeof input === 'undefined') {
        return 'null';
    }
    try {
        return stringify(input, pretty);
    }
    catch (err) {
        if (logger && logger.warn) {
            logger.warn('pack() error:', err);
        }
        return 'null';
    }
}
/**
 * Deserializes given input JSON string to corresponding JSON value object.
 * On error will return empty object
 *
 * @param {string} input - string to deserialize
 * @param {AnyLogger} [logger] - logger to handle errors logging with
 * @return {AnyJson}
 */
function unpack(input, logger) {
    if (typeof input !== 'string') {
        return null;
    }
    try {
        return JSON.parse(input);
    }
    catch (err) {
        if (logger && logger.warn) {
            logger.warn('unpack() error:', err);
        }
        return {};
    }
}
/**
 * Constructs and returns hash string for a given set of processId, channel
 * and payload.
 *
 * @param {string} processId
 * @param {string} channel
 * @param {any} payload
 * @returns {string}
 */
function signature(processId, channel, payload) {
    const data = JSON.stringify([processId, channel, payload]);
    const hashBigInt = (0, farmhash_1.fingerprint64)(data);
    return hashBigInt.toString(16);
}
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