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cmd.go
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/
cmd.go
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// Copyright 2017 the lostromos Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"fmt"
"os"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"github.com/spf13/viper"
"go.uber.org/zap"
)
var (
cfgFile string
logger *zap.SugaredLogger
)
// LostromosCmd represents the base command when called without any subcommands
var LostromosCmd = &cobra.Command{
Use: "lostromos",
Short: "Create K8s resources from Custom Resources",
Long: `Lostromos will monitor all the resources created in your K8s CRD
and create, update, and delete resources based on the templates provided.`,
}
// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the LostromosCmd.
func Execute() {
// Before we exit ensure we sync all logs out
defer func() {
if logger == nil {
return
}
if err := logger.Sync(); err != nil {
logger.Errorw("failed to sync logger", "error", err)
}
}()
if err := LostromosCmd.Execute(); err != nil {
fmt.Println(err)
os.Exit(1)
}
}
func init() {
cobra.OnInitialize(initConfig)
LostromosCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is /etc/lostromos.yaml)")
LostromosCmd.PersistentFlags().BoolP("debug", "", false, "enable debug logging")
LostromosCmd.PersistentFlags().BoolP("pretty", "", false, "print logs in human readable form instead of json")
viperBindFlag("logging.debug", LostromosCmd.PersistentFlags().Lookup("debug"))
viperBindFlag("logging.pretty", LostromosCmd.PersistentFlags().Lookup("pretty"))
}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
if cfgFile != "" {
// Use config file from the flag.
viper.SetConfigFile(cfgFile)
} else {
// Use default config file /etc/lostromos.yaml
viper.AddConfigPath("/etc")
viper.SetConfigName("lostromos")
}
viper.AutomaticEnv() // read in environment variables that match
// If a config file is found, read it in.
err := viper.ReadInConfig()
// Setup logging after all config options are read in
setupLogging()
if err != nil {
logger.Debugw("failed to read config file", "error", err)
}
logger.Infow("loading config...", "configFile", viper.ConfigFileUsed())
}
func viperBindFlag(name string, flag *pflag.Flag) {
err := viper.BindPFlag(name, flag)
if err != nil {
panic(err)
}
}
func setupLogging() {
cfg := zap.NewProductionConfig()
if viper.GetBool("logging.pretty") {
cfg = zap.NewDevelopmentConfig()
}
if viper.GetBool("logging.debug") {
cfg.Level = zap.NewAtomicLevelAt(zap.DebugLevel)
} else {
cfg.Level = zap.NewAtomicLevelAt(zap.InfoLevel)
}
l, err := cfg.Build()
if err != nil {
panic(err)
}
logger = l.Sugar()
}