mirror of
https://github.com/gitpod-io/gitpod.git
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127 lines
3.2 KiB
Go
127 lines
3.2 KiB
Go
// Copyright (c) 2020 Gitpod GmbH. All rights reserved.
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// Licensed under the GNU Affero General Public License (AGPL).
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// See License.AGPL.txt in the project root for license information.
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package cmd
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import (
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"fmt"
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"os"
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"time"
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homedir "github.com/mitchellh/go-homedir"
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"github.com/spf13/cobra"
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"github.com/spf13/viper"
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"github.com/gitpod-io/gitpod/common-go/log"
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)
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var (
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// ServiceName is the name we use for tracing/logging
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ServiceName = "service-waiter"
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// Version of this service - set during build
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Version = ""
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)
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var cfgFile string
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var jsonLog bool
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var verbose bool
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// rootCmd represents the base command when called without any subcommands
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var rootCmd = &cobra.Command{
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Use: "service-waiter",
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Short: "service-waiter waits until a service becomes available",
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PersistentPreRun: func(cmd *cobra.Command, args []string) {
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log.Init(ServiceName, Version, jsonLog, verbose)
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},
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}
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// Execute adds all child commands to the root command and sets flags appropriately.
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// This is called by main.main(). It only needs to happen once to the rootCmd.
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func Execute() {
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if err := rootCmd.Execute(); err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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}
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func init() {
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cobra.OnInitialize(initConfig)
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rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.service-waiter.yaml)")
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rootCmd.PersistentFlags().BoolVarP(&jsonLog, "json-log", "j", true, "produce JSON log output on verbose level")
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rootCmd.PersistentFlags().BoolVarP(&verbose, "verbose", "v", false, "Enable verbose JSON logging")
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defaultTimeout := os.Getenv("SERVICE_WAITER_TIMEOUT")
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if defaultTimeout == "" {
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defaultTimeout = "5m"
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}
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rootCmd.PersistentFlags().StringP("timeout", "t", defaultTimeout, "the maximum time to wait for")
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err := viper.BindPFlags(rootCmd.PersistentFlags())
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if err != nil {
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log.WithError(err).Fatal("cannot bind Viper to pflags")
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}
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}
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// initConfig reads in config file and ENV variables if set.
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func initConfig() {
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if cfgFile != "" {
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// Use config file from the flag.
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viper.SetConfigFile(cfgFile)
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} else {
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// Find home directory.
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home, err := homedir.Dir()
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if err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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// Search config in home directory with name ".service-waiter" (without extension).
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viper.AddConfigPath(home)
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viper.SetConfigName(".service-waiter")
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}
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viper.AutomaticEnv() // read in environment variables that match
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// If a config file is found, read it in.
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if err := viper.ReadInConfig(); err == nil {
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fmt.Println("Using config file:", viper.ConfigFileUsed())
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}
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}
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func getTimeout() time.Duration {
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t := viper.GetString("timeout")
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timeout, err := time.ParseDuration(t)
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if err != nil {
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log.WithError(err).Fatal("cannot parse timeout")
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}
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return timeout
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}
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// fail ends the waiting process propagating the message on its way out
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func fail(message string) {
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terminationLog := "/dev/termination-log"
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log.WithField("message", message).Warn("failed to wait for a service")
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if _, err := os.Stat(terminationLog); !os.IsNotExist(err) {
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err := os.WriteFile(terminationLog, []byte(message), 0600)
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if err != nil {
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log.WithError(err).Error("cannot write termination log")
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}
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}
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os.Exit(1)
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}
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func envOrDefault(env, def string) (res string) {
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res = os.Getenv(env)
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if res == "" {
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res = def
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}
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return
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}
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