forked from TheThingsArchive/ttn
/
root.go
71 lines (58 loc) · 1.91 KB
/
root.go
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// Copyright © 2016 The Things Network
// Use of this source code is governed by the MIT license that can be found in the LICENSE file.
package cmd
import (
"fmt"
"os"
"strings"
cliHandler "github.com/TheThingsNetwork/ttn/utils/cli/handler"
"github.com/apex/log"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
var cfgFile string
var ctx log.Interface
// RootCmd is executed when ttn is executed without a subcommand
var RootCmd = &cobra.Command{
Use: "ttn",
Short: "The Things Network's backend servers",
Long: `ttn launches The Things Network's backend servers`,
PersistentPreRun: func(cmd *cobra.Command, args []string) {
var logLevel = log.InfoLevel
if viper.GetBool("debug") {
logLevel = log.DebugLevel
}
ctx = &log.Logger{
Level: logLevel,
Handler: cliHandler.New(os.Stdout),
}
},
}
// Execute adds all child commands to the root command sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
if err := RootCmd.Execute(); err != nil {
fmt.Println(err)
os.Exit(-1)
}
}
func init() {
cobra.OnInitialize(initConfig)
RootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default \"$HOME/.ttn.yaml\")")
}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
if cfgFile != "" { // enable ability to specify config file via flag
viper.SetConfigFile(cfgFile)
}
viper.SetConfigName(".ttn") // name of config file (without extension)
viper.AddConfigPath("$HOME") // adding home directory as first search path
viper.SetEnvPrefix("ttn") // set environment prefix
viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_", "-", "_"))
viper.AutomaticEnv() // read in environment variables that match
viper.BindEnv("debug")
// If a config file is found, read it in.
if err := viper.ReadInConfig(); err == nil {
fmt.Println("Using config file:", viper.ConfigFileUsed())
}
}