http-alive/util.js

keep your web service always online

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const fs = require('fs');
const CONF_FILE = '.httpalive';
const DEFAULT_CONF = { arbiter: 3000, master: 3001, slave: 3002 };
const PID_FILE = '.httpalive.pid';
const DEFAULT_PID = { arbiter: null, master: null, slave: null };
exports.checkPid = (pid) => {
    try {
        process.kill(pid, 0);
        return true;
    }
    catch (e) {
        return e.code === 'EPERM';
    }
};
exports.parseConf = () => {
    let exist = fs.existsSync(CONF_FILE);
    if (exist) {
        let data = fs.readFileSync(CONF_FILE, 'utf-8');
        return JSON.parse(data);
    }
    else {
        console.log('please edit your config file `.httpalive`');
        fs.writeFileSync(CONF_FILE, JSON.stringify(DEFAULT_CONF));
        process.exit(0);
    }
    return DEFAULT_CONF;
};
exports.delay = (wait, fn) => setTimeout(fn, wait);
exports.setPid = (type, pid) => {
    let exist = fs.existsSync(PID_FILE);
    if (exist) {
        let data = fs.readFileSync(PID_FILE, 'utf-8');
        let j = JSON.parse(data);
        j[type] = pid;
        fs.writeFileSync(PID_FILE, JSON.stringify(j));
    }
    else {
        fs.writeFileSync(PID_FILE, JSON.stringify(DEFAULT_PID));
        return exports.setPid(type, pid);
    }
};
exports.getPid = (type) => {
    let exist = fs.existsSync(PID_FILE);
    if (exist) {
        let data = fs.readFileSync(PID_FILE, 'utf-8');
        let j = JSON.parse(data);
        return j[type];
    }
    else {
        return null;
    }
};
exports.sample = (arr) => {
    if (arr.length === 1) {
        return arr[0];
    }
    if (Math.random() > 0.5) {
        return arr[1];
    }
    else {
        return arr[0];
    }
};