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config.go
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config.go
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package config
import (
"flag"
"fmt"
"io/ioutil"
"os"
"github.com/ghodss/yaml"
)
type config struct {
Name string `json:"name"`
configFile string
flagSet *flag.FlagSet
}
var usageline = `Usage:
server [flags]
Start an server.
server --config-file
Path to the server configuration file.
`
func usage() {
fmt.Fprintln(os.Stdout, usageline)
}
// NewConfig New Config
func NewConfig() *config {
cfg := &config{}
f := flag.NewFlagSet("name", flag.ContinueOnError)
f.Usage = usage
f.StringVar(&cfg.configFile, "c", "", "Path to the server configuration file")
f.StringVar(&cfg.configFile, "config-file", "", "Path to the server configuration file")
f.StringVar(&cfg.Name, "name", "", "Path to the server configuration file")
if cfg.configFile != "" {
err := cfg.configFromFile(cfg.configFile)
if err != nil {
fmt.Println("Load config file error, file: ", cfg.configFile, " error: ", err.Error())
} else {
fmt.Println("Load config file success, file: ", cfg.configFile)
}
}
cfg.flagSet = f
return cfg
}
func (cfg *config) configFromFile(configFile string) error {
b, rerr := ioutil.ReadFile(configFile)
if rerr != nil {
return rerr
}
if yerr := yaml.Unmarshal(b, &cfg); yerr != nil {
return yerr
}
return nil
}
func (cfg *config) parse(arguments []string) error {
err := cfg.flagSet.Parse(arguments)
switch err {
case nil:
case flag.ErrHelp:
fmt.Println(usageline)
os.Exit(0)
default:
os.Exit(2)
}
return err
}