iccicci/daemon-control

"use strict";

var commands = {
    help:     null,
    nodaemon: null,
    reload:   null,
    restart:  null,
    start:    null,
    status:   null,
    stop:     null,
};

var hooks = {
    argv:     null,
    help:     null,
    kill:     null,
    reload:   null,
    running:  null,
    start:    null,
    starting: null,
    status:   null,
    stop:     null,
    syntax:   null,
    term:     null,
    wait:     null,
};

function _init() {
    if(! this.daemon)
        throw new Error("DaemonControl: missing daemon parameter");

    if("function" !== typeof this.daemon)
        throw new Error("DaemonControl: daemon parameter is not a function");

    if(! this.filename)
        throw new Error("DaemonControl: missing filename parameter");

    if("string" !== typeof this.filename)
        throw new Error("DaemonControl: filename parameter is not a string");

    if("undefined" === typeof this.options)
        this.options = {};
    else
        if("object" !== typeof this.options)
            throw new Error("DaemonControl: options parameter is not an object");

    this._init_options();
}

function _init_options() {
    var i;

    if(! this.options.hooks)
        this.hooks = {};
    else {
        this.hooks = this.options.hooks;
        delete this.options.hooks;

        if("object" !== typeof this.hooks)
            throw new Error("DaemonControl: options.hooks is not an object");
    }

    for(i in this.hooks) {
        if(! (i in hooks))
            throw new Error("DaemonControl: unknow hook options.hooks." + i);

        if("function" !== typeof this.hooks[i])
            throw new Error("DaemonControl: options.hooks." + i + " is not a function");
    }

    if("reload" in this.options) {
        this.reload = this.options.reload;
        delete this.options.reload;
    }

    if("timeout" in this.options) {
        this.timeout = parseInt(this.options.timeout, 10);
        delete this.options.timeout;

        if(isNaN(this.timeout))
            throw new Error("DaemonControl: timeout parameter is not an integer number");

        if(this.timeout <= 0)
            throw new Error("DaemonControl: timeout parameter is not a non zero positive integer number");
    }
    else
        this.timeout = 5;

    this._init_spawn();
}

function _init_spawn() {
    var i;

    if(! ("cwd" in this.options))
        this.options.cwd = process.cwd();
    else
        if("string" !== typeof this.options.cwd)
            throw new Error("DaemonControl: cwd option is not a string");

    if(! ("env" in this.options)) {
        this.options.env = {};

        for(i in process.env)
            this.options.env[i] = process.env[i];
    }
    else
        if("object" !== typeof this.options.env)
            throw new Error("DaemonControl: env option is not an object");

    if(! ("stdio" in this.options))
        this.options.stdio = "ignore";

    if(! ("detached" in this.options))
        this.options.detached = true;
}

function _write(msg) {
    process.stdout.write(msg);
}

module.exports = {
    _init:         _init,
    _init_options: _init_options,
    _init_spawn:   _init_spawn,
    _write:        _write,
    commands:      commands,
    hooks:         hooks,
};