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root.go
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root.go
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package cmd
import (
"fmt"
"os"
log "github.com/sirupsen/logrus"
"github.com/cloudfoundry-community/go-cfenv"
homedir "github.com/mitchellh/go-homedir"
"github.com/spf13/cobra"
"github.com/spf13/viper"
"github.com/adfinis-sygroup/potz-holzoepfel-und-zipfelchape/pkg"
)
var (
cfgFile string
listenAddr string
persistence bool
mongodbURI string
mongodbDatabase string
mongodbCollection string
mongodbDocumentID string
jaegerServiceName string
)
// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
Use: "potz-holzoepfel-und-zipfelchape",
Short: "Tri Tra Trulla La",
Long: "Dr Caasperli isch wider da! Dr Caasperli isch da.",
Run: func(cmd *cobra.Command, args []string) {
pkg.RunServer(listenAddr, persistence, mongodbURI, mongodbDatabase, mongodbCollection, mongodbDocumentID, jaegerServiceName)
},
}
// 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 {
fmt.Println(err)
os.Exit(1)
}
}
func init() {
cobra.OnInitialize(initConfig)
rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.potz-holzoepfel-und-zipfelchape.yaml)")
rootCmd.PersistentFlags().StringVar(&listenAddr, "listen-addr", ":8080", "Listen address")
rootCmd.PersistentFlags().BoolVar(&persistence, "persistence", false, "Enable persistence layer")
rootCmd.PersistentFlags().StringVar(&mongodbURI, "mongodb-uri", "mongodb://root:hunter2@localhost:27017", "MongoDB URI")
rootCmd.PersistentFlags().StringVar(&mongodbDatabase, "mongodb-database", "test", "MongoDB database")
rootCmd.PersistentFlags().StringVar(&mongodbCollection, "mongodb-collection", "counter", "MongoDB collection")
rootCmd.PersistentFlags().StringVar(&mongodbDocumentID, "mongodb-document-id", "DECAFBAD", "MongoDB counter document ID")
rootCmd.PersistentFlags().StringVar(&jaegerServiceName, "jaeger-service-name", rootCmd.Use, "Jaeger client service name")
if err := viper.BindPFlag("listen-addr", rootCmd.PersistentFlags().Lookup("listen-addr")); err != nil {
fmt.Println(err)
os.Exit(1)
}
}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
if cfgFile != "" {
// Use config file from the flag.
viper.SetConfigFile(cfgFile)
} else {
// Find home directory.
home, err := homedir.Dir()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
// Search config in home directory with name ".potz-holzoepfel-und-zipfelchape" (without extension).
viper.AddConfigPath(home)
viper.SetConfigName(".potz-holzoepfel-und-zipfelchape")
}
viper.AutomaticEnv() // read in environment variables that match
// If a config file is found, read it in.
if err := viper.ReadInConfig(); err == nil {
fmt.Println("Using config file:", viper.ConfigFileUsed())
}
if cfenv.IsRunningOnCF() {
log.Info("We are running on Cloud Foundry!")
appEnv, _ := cfenv.Current()
mongoService, err := appEnv.Services.WithName("mongodb")
if err != nil {
log.Warn(err)
} else {
mongodbURI, _ = mongoService.CredentialString("uri")
persistence = true
log.Info("MongoDB credentials detected in service mongodb, activating persistence layer.")
}
}
}