http-alive/http-alive.js

keep your web service always online

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const path = require('path');
const child_process_1 = require("child_process");
const util_1 = require("./util");
run();
function run() {
    const conf = util_1.parseConf();
    process.env.PORT = process.env.PORT || conf.master.toString();
    if (!process.env.HTTP_ALIVE_LOCK) {
        const arbiter = child_process_1.spawn('node', [path.resolve(__dirname, 'server.js')], {
            detached: true,
            stdio: 'pipe',
            env: Object.assign({}, process.env, { PORT: conf.arbiter.toString(), MASTER_PORT: conf.master.toString(), SLAVE_PORT: conf.slave.toString(), HTTP_ALIVE_LOCK: 'true' })
        });
        arbiter.stderr.on('data', (data) => {
            if (data.toString().includes('EADDRINUSE')) {
                console.log('[arbiter]:previous ok, skip restart');
            }
            else {
                console.log('[arbiter]:' + data);
            }
        });
        arbiter.stdout.on('data', (data) => {
            console.log('[arbiter]:' + data);
        });
        util_1.delay(5000, () => {
            // if master ok
            if (util_1.checkPid(process.pid)) {
                util_1.setPid('master', process.pid);
                const slavePid = util_1.getPid('slave'); // if old slave exist
                if (slavePid) {
                    try {
                        process.kill(slavePid);
                        console.log(`kill pid ${slavePid} of slave`);
                    }
                    catch (e) {
                        console.log(`skip pid ${slavePid} of slave`);
                    }
                }
                util_1.delay(1000, () => {
                    const slave = child_process_1.spawn('node', [module.parent.filename.replace('.ts', '.js')], {
                        detached: true,
                        stdio: 'pipe',
                        env: Object.assign({}, process.env, { PORT: conf.slave.toString(), HTTP_ALIVE_LOCK: 'true' })
                    });
                    slave.stderr.on('data', (data) => {
                        console.error('[slave]:' + data);
                    });
                    slave.stdout.on('data', (data) => {
                        console.log('[slave]:' + data);
                    });
                    util_1.delay(3000, () => {
                        if (util_1.checkPid(slave.pid)) {
                            util_1.setPid('slave', slave.pid);
                        }
                    });
                });
            }
        });
        util_1.delay(3000, () => {
            if (util_1.checkPid(arbiter.pid)) {
                util_1.setPid('arbiter', arbiter.pid);
            }
            if (util_1.checkPid(process.pid)) {
                util_1.setPid('master', process.pid);
            }
        });
        process.env.HTTP_ALIVE_LOCK = 'true';
    }
}