cli.js

//cheerio or orm2 are causing memory leaks,
// so restart the app when it self-closes with a special exit code
const restoreCursor = require('restore-cursor');
const spawn = require('child_process').spawn

const constants = require('./lib/constants')
const LOG_PREFIX = 'PROCESS MONITOR'
const log = require('./lib/logger').prefix(LOG_PREFIX);
const errlog = require('./lib/logger').error(LOG_PREFIX);

var child;
var timeout;

function spawnProcess(isRespawned) {

    //log(process.argv)
    //process.exit();

    //https://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options
    var args = process.argv.slice(2)
    if (isRespawned) {
        args.push('--respawned')
    }

    child = spawn('node', ['--expose-gc', '--optimize_for_size', 'runner.js'].concat(args), {
        stdio: [process.stdin, process.stdout, process.stderr]
    })

    var handled = false;
    child.on('error', function (err) {
        errlog('Failed to start child process.', err, err.stack);
    });

    function _onClose(code, signal) {
        log('CLI EXITED WITH', code)

        //TODO start parsing when code is 200
        if (code === 100) {
            log('*** RESTART ***')
            clearTimeout(timeout)
            timeout = setTimeout(function () {
                spawnProcess(true)
            }, 500)
        } else {
            child.removeListener('close', _onClose)
            restoreCursor();
            process.stdin.end()
        }
    }

    child.on('close', _onClose)

    //catches ctrl+c event


    //child.stdout.on('data', function (data) {
    //    console.log(data.toString());
    //});
    //
    //child.stderr.on('data', function (data) {
    //    console.log(data.toString());
    //});

}

process.on('SIGINT', function () {
    if (child) {
        log('*** CLOSE CHILD PROCESS ***')
        child.kill('SIGINT')
    }
});

spawnProcess()