alibabacloud-eci/root.go

// Copyright © 2017 The virtual-kubelet 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 (
	"context"
	"os"
	"path/filepath"
	"strings"

	"github.com/Sirupsen/logrus"
	homedir "github.com/mitchellh/go-homedir"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
	"github.com/virtual-kubelet/virtual-kubelet/log"
	"github.com/virtual-kubelet/virtual-kubelet/providers"
	vkubelet "github.com/virtual-kubelet/virtual-kubelet/vkubelet"
	corev1 "k8s.io/api/core/v1"
)

var kubeletConfig string
var kubeConfig string
var kubeNamespace string
var nodeName string
var operatingSystem string
var provider string
var providerConfig string
var taintKey string
var disableTaint bool
var logLevel string

// RootCmd represents the base command when called without any subcommands
var RootCmd = &cobra.Command{
	Use:   "virtual-kubelet",
	Short: "virtual-kubelet provides a virtual kubelet interface for your kubernetes cluster.",
	Long: `virtual-kubelet implements the Kubelet interface with a pluggable 
backend implementation allowing users to create kubernetes nodes without running the kubelet.
This allows users to schedule kubernetes workloads on nodes that aren't running Kubernetes.`,
	Run: func(cmd *cobra.Command, args []string) {
		f, err := vkubelet.New(nodeName, operatingSystem, kubeNamespace, kubeConfig, provider, providerConfig, taintKey, disableTaint)
		if err != nil {
			log.L.WithError(err).Fatal("Error initializing vritual kubelet")
		}
		if err := f.Run(context.Background()); err != nil {
			log.L.Fatal(err)
		}
	},
}

// 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 rootCmd.
func Execute() {
	if err := RootCmd.Execute(); err != nil {
		log.GetLogger(context.TODO()).WithError(err).Fatal("Error executing root command")
	}
}

func init() {
	cobra.OnInitialize(initConfig)

	// read default node name from environment variable.
	// it can be overwritten by cli flags if specified.
	defaultNodeName := os.Getenv("DEFAULT_NODE_NAME")
	if defaultNodeName == "" {
		defaultNodeName = "virtual-kubelet"
	}
	// Here you will define your flags and configuration settings.
	// Cobra supports persistent flags, which, if defined here,
	// will be global for your application.
	//RootCmd.PersistentFlags().StringVar(&kubeletConfig, "config", "", "config file (default is $HOME/.virtual-kubelet.yaml)")
	RootCmd.PersistentFlags().StringVar(&kubeConfig, "kubeconfig", "", "config file (default is $HOME/.kube/config)")
	RootCmd.PersistentFlags().StringVar(&kubeNamespace, "namespace", "", "kubernetes namespace (default is 'all')")
	RootCmd.PersistentFlags().StringVar(&nodeName, "nodename", defaultNodeName, "kubernetes node name")
	RootCmd.PersistentFlags().StringVar(&operatingSystem, "os", "Linux", "Operating System (Linux/Windows)")
	RootCmd.PersistentFlags().StringVar(&provider, "provider", "", "cloud provider")
	RootCmd.PersistentFlags().BoolVar(&disableTaint, "disable-taint", false, "disable the virtual-kubelet node taint")
	RootCmd.PersistentFlags().StringVar(&providerConfig, "provider-config", "", "cloud provider configuration file")
	RootCmd.PersistentFlags().StringVar(&taintKey, "taint", "", "Set node taint key")
	RootCmd.PersistentFlags().MarkDeprecated("taint", "Taint key should now be configured using the VK_TAINT_KEY environment variable")
	RootCmd.PersistentFlags().StringVar(&logLevel, "log-level", "info", `set the log level, e.g. "trace", debug", "info", "warn", "error"`)

	// Cobra also supports local flags, which will only run
	// when this action is called directly.
	// RootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
}

// initConfig reads in config file and ENV variables if set.
func initConfig() {
	if provider == "" {
		log.G(context.TODO()).Fatal("You must supply a cloud provider option: use --provider")
	}

	// Find home directory.
	home, err := homedir.Dir()
	if err != nil {
		log.G(context.TODO()).WithError(err).Fatal("Error reading homedir")
	}

	if kubeletConfig != "" {
		// Use config file from the flag.
		viper.SetConfigFile(kubeletConfig)
	} else {
		// Search config in home directory with name ".virtual-kubelet" (without extension).
		viper.AddConfigPath(home)
		viper.SetConfigName(".virtual-kubelet")
	}

	viper.AutomaticEnv() // read in environment variables that match

	// If a config file is found, read it in.
	if err := viper.ReadInConfig(); err == nil {
		log.G(context.TODO()).Debugf("Using config file %s", viper.ConfigFileUsed())
	}

	if kubeConfig == "" {
		kubeConfig = filepath.Join(home, ".kube", "config")

	}

	if kubeNamespace == "" {
		kubeNamespace = corev1.NamespaceAll
	}

	// Validate operating system.
	ok, _ := providers.ValidOperatingSystems[operatingSystem]
	if !ok {
		log.G(context.TODO()).WithField("OperatingSystem", operatingSystem).Fatalf("Operating system not supported. Valid options are: %s", strings.Join(providers.ValidOperatingSystems.Names(), " | "))
	}

	level, err := log.ParseLevel(logLevel)
	if err != nil {
		log.G(context.TODO()).WithField("logLevel", logLevel).Fatal("log level is not supported")
	}

	logger := log.L.WithFields(logrus.Fields{
		"provider":        provider,
		"operatingSystem": operatingSystem,
		"node":            nodeName,
		"namespace":       kubeNamespace,
	})
	logger.Level = level
	log.L = logger
}