config.go

package main

import (
	"encoding/json"
	"io/ioutil"
	"net"
)

//Config server configration file
type Config struct {
	IncomingDir string `json:"incomingdir"` //IncomingDir incoming directory
	OutgoingDir string `json:"outgoingdir"` //OutgoingDir outgoing directory, can be the same as incoming
	IP          net.IP `json:"listenip"`    //IP IP address to listen on
	Port        int    `json:"port"`        //Port port to listen on 69 is the default, requires root or administrator privledges
	Protocol    string `json:"protocol"`    //Protocol protocol to listen on can be udp,udp4,udp6
	Stats       bool   `json:"stats"`       //Stats determines if stats are to be collected or not
	StatsIP     net.IP `json:"statsip"`     //StatsIP the IP address to listen on for stats api 127.0.0.1 default
	StatsPort   int    `json:"statsport"`   //StatsPort the port to listen on for stats api 126969 default
}

//NewConfig creates a new config struct and returns it
//If not loaded with Parse then the method returns the defaults
// Default configuration
// IncomingDir "./incoming"
// OutgoingDir "./outgong"
// IP "0.0.0.0"
// Port 69
// Protocol "udp4"
// Stats true
// StatsIP "127.0.0.1" IPv4 localhost IP
// StatsPort 126969
func NewConfig() *Config {
	return &Config{IncomingDir: "./incoming", OutgoingDir: "./outgoing", IP: net.ParseIP("0.0.0.0"), Port: 6969, Protocol: "udp4", Stats: true, StatsIP: net.ParseIP("127.0.0.1"), StatsPort: 16969}
}

//Open open a new config file
func (c *Config) Open(config string) error {
	file, err := ioutil.ReadFile(config)
	if err != nil {
		return err
	}

	newConfig := NewConfig()
	if err := json.Unmarshal(file, &newConfig); err != nil {
		return err
	}
	c.IncomingDir = newConfig.IncomingDir
	c.OutgoingDir = newConfig.OutgoingDir
	c.IP = newConfig.IP
	c.Port = newConfig.Port
	c.Protocol = newConfig.Protocol
	return nil
}

//StringParse parse a JSON string configuration file
func (c *Config) StringParse(config string) error {
	newConfig := NewConfig()
	if err := json.Unmarshal([]byte(config), &newConfig); err != nil {
		return err
	}
	c.IncomingDir = newConfig.IncomingDir
	c.OutgoingDir = newConfig.OutgoingDir
	c.IP = newConfig.IP
	c.Port = newConfig.Port
	c.Protocol = newConfig.Protocol
	return nil
}