@imqueue/rpc/src/helpers/pid.js

RPC-like client-service implementation over messaging queue

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.IMQ_PID_DIR = exports.IMQ_TMP_DIR = exports.SIGNALS = void 0;
exports.pid = pid;
exports.forgetPid = forgetPid;
/*!
 * IMQ-RPC helpers: pid, forgetPid
 *
 * Copyright (c) 2018, imqueue.com <support@imqueue.com>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */
const path = require("path");
const fs = require("fs");
exports.SIGNALS = [
    'SIGTERM',
    'SIGINT',
    'SIGHUP',
    'SIGQUIT',
];
exports.IMQ_TMP_DIR = process.env.TMPDIR ||
    // istanbul ignore next
    '/tmp';
exports.IMQ_PID_DIR = path.resolve(exports.IMQ_TMP_DIR, '.imq-rpc');
/**
 * Returns increment-based process identifier for a given name
 *
 * @param {string} name - name of a service to create pid file for
 * @param {string} path - directory to
 * @returns {number}
 */
function pid(name, 
// istanbul ignore next
path = exports.IMQ_PID_DIR) {
    const pidFile = `${path}/${name}`;
    const pidOpts = { encoding: 'utf8', flag: 'wx' };
    if (!fs.existsSync(path)) {
        fs.mkdirSync(path);
    }
    let id = 0;
    let done = false;
    while (!done) {
        try {
            fs.writeFileSync(`${pidFile}-${id}.pid`, process.pid + '', pidOpts);
            done = true;
        }
        catch (err) {
            // istanbul ignore next
            if (err.code === 'EEXIST') {
                id++;
            }
            else {
                throw err;
            }
        }
    }
    return id;
}
/**
 * Removes pid file for a given name and id
 *
 * @param {string} name
 * @param {number} id
 * @param {ILogger} logger
 * @param {string} [path]
 */
function forgetPid(name, id, logger, 
// istanbul ignore next
path = exports.IMQ_PID_DIR) {
    try {
        fs.unlinkSync(`${path}/${name}-${id}.pid`);
    }
    catch (err) { /* ignore */ }
}
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