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root.go
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root.go
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package cmd
import (
"context"
"fmt"
"log"
"os"
"os/signal"
"os/user"
"path"
"strings"
"github.com/exoscale/egoscale"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
var gContext context.Context
var gConfigFolder string
var gConfigFilePath string
//current Account information
var gAccountName string
var gCurrentAccount *account
var gAllAccount *config
//egoscale client
var cs *egoscale.Client
var csDNS *egoscale.Client
//Aliases
var gListAlias = []string{"ls"}
var gRemoveAlias = []string{"rm"}
var gDeleteAlias = []string{"del"}
var gShowAlias = []string{"get"}
var gCreateAlias = []string{"add"}
var gUploadAlias = []string{"up"}
var gDissociateAlias = []string{"disassociate", "dissoc"}
var gAssociateAlias = []string{"assoc"}
type account struct {
Name string
Account string
Endpoint string
ComputeEndpoint string // legacy config.
DNSEndpoint string
SosEndpoint string
Key string
Secret string
DefaultZone string
DefaultSSHKey string
DefaultTemplate string
}
type config struct {
DefaultAccount string
Accounts []account
}
// RootCmd represents the base command when called without any subcommands
var RootCmd = &cobra.Command{
Use: "exo",
Short: "Manage easily your Exoscale infrastructure",
SilenceUsage: true,
SilenceErrors: true,
}
var gVersion string
var gCommit string
var versionCmd = &cobra.Command{
Use: "version",
Short: "Print the version of exo",
Run: func(cmd *cobra.Command, args []string) {
fmt.Printf("exo %s %s (egoscale %s)\n", gVersion, gCommit, egoscale.Version)
},
}
// 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(version, commit string) {
gVersion = version
gCommit = commit
// trap Ctrl+C and call cancel on the context
ctx, cancel := context.WithCancel(context.Background())
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
defer func() {
signal.Stop(c)
cancel()
}()
go func() {
select {
case <-c:
cancel()
case <-ctx.Done():
}
}()
gContext = ctx
if err := RootCmd.Execute(); err != nil {
fmt.Println(err)
os.Exit(1)
}
}
func init() {
RootCmd.PersistentFlags().StringVarP(&gConfigFilePath, "config", "C", "", "Specify an alternate config file [env EXOSCALE_CONFIG]")
RootCmd.PersistentFlags().StringVarP(&gAccountName, "account", "A", "", "Account to use in config file [env EXOSCALE_ACCOUNT]")
RootCmd.AddCommand(versionCmd)
cobra.OnInitialize(initConfig, buildClient)
}
var ignoreClientBuild = false
func buildClient() {
if ignoreClientBuild {
return
}
if cs != nil {
return
}
csDNS = egoscale.NewClient(gCurrentAccount.DNSEndpoint, gCurrentAccount.Key, gCurrentAccount.Secret)
cs = egoscale.NewClient(gCurrentAccount.Endpoint, gCurrentAccount.Key, gCurrentAccount.Secret)
}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
envs := map[string]string{
"EXOSCALE_CONFIG": "config",
"EXOSCALE_ACCOUNT": "account",
}
for env, flag := range envs {
flag := RootCmd.Flags().Lookup(flag)
if value, ok := os.LookupEnv(env); ok {
if err := flag.Value.Set(value); err != nil {
log.Fatal(err)
}
}
}
// an attempt to mimic existing behaviours
envEndpoint := readFromEnv(
"EXOSCALE_ENDPOINT",
"EXOSCALE_COMPUTE_ENDPOINT",
"CLOUDSTACK_ENDPOINT")
envKey := readFromEnv(
"EXOSCALE_KEY",
"EXOSCALE_API_KEY",
"CLOUDSTACK_KEY",
"CLOUSTACK_API_KEY",
)
envSecret := readFromEnv(
"EXOSCALE_SECRET",
"EXOSCALE_API_SECRET",
"EXOSCALE_SECRET_KEY",
"CLOUDSTACK_SECRET",
"CLOUDSTACK_SECRET_KEY",
)
if envEndpoint != "" && envKey != "" && envSecret != "" {
cs = egoscale.NewClient(envEndpoint, envKey, envSecret)
return
}
config := &config{}
usr, err := user.Current()
if err != nil {
log.Fatal(err)
}
gConfigFolder = path.Join(usr.HomeDir, ".exoscale")
if gConfigFilePath != "" {
// Use config file from the flag.
viper.SetConfigFile(gConfigFilePath)
} else {
// Search config in home directory with name ".cobra_test" (without extension).
viper.SetConfigName("exoscale")
viper.AddConfigPath(path.Join(usr.HomeDir, ".exoscale"))
viper.AddConfigPath(usr.HomeDir)
viper.AddConfigPath(".")
}
if err := viper.ReadInConfig(); err != nil && getCmdPosition("config") == 1 {
ignoreClientBuild = true
return
}
if err := viper.ReadInConfig(); err != nil {
log.Fatal(err)
}
if err := viper.Unmarshal(config); err != nil {
log.Fatal(fmt.Errorf("couldn't read config: %s", err))
}
if config.DefaultAccount == "" && gAccountName == "" {
log.Fatalf("default account not defined")
}
if gAccountName == "" {
gAccountName = config.DefaultAccount
}
gAllAccount = config
gAllAccount.DefaultAccount = gAccountName
for i, acc := range config.Accounts {
if acc.Name == gAccountName {
gCurrentAccount = &config.Accounts[i]
break
}
}
if gCurrentAccount == nil {
log.Fatalf("could't find any account with name: %q", gAccountName)
}
if gCurrentAccount.Endpoint == "" {
if gCurrentAccount.ComputeEndpoint != "" {
gCurrentAccount.Endpoint = gCurrentAccount.ComputeEndpoint
} else {
gCurrentAccount.Endpoint = defaultEndpoint
}
}
if gCurrentAccount.DNSEndpoint == "" {
gCurrentAccount.DNSEndpoint = strings.Replace(gCurrentAccount.Endpoint, "/compute", "/dns", 1)
}
if gCurrentAccount.DefaultTemplate == "" {
gCurrentAccount.DefaultTemplate = defaultTemplate
}
if gCurrentAccount.SosEndpoint == "" {
gCurrentAccount.SosEndpoint = defaultSosEndpoint
}
gCurrentAccount.Endpoint = strings.TrimRight(gCurrentAccount.Endpoint, "/")
gCurrentAccount.DNSEndpoint = strings.TrimRight(gCurrentAccount.DNSEndpoint, "/")
gCurrentAccount.SosEndpoint = strings.TrimRight(gCurrentAccount.SosEndpoint, "/")
}
// getCmdPosition returns a command position by fetching os.args and ignoring flags
//
// example: "$ exo -r preprod vm create" vm position is 1 and create is 2
//
func getCmdPosition(cmd string) int {
count := 1
isFlagParam := false
for _, arg := range os.Args[1:] {
if strings.HasPrefix(arg, "-") {
flag := RootCmd.Flags().Lookup(strings.Trim(arg, "-"))
if flag == nil {
flag = RootCmd.Flags().ShorthandLookup(strings.Trim(arg, "-"))
}
if flag != nil && (flag.Value.Type() != "bool") {
isFlagParam = true
}
continue
}
if isFlagParam {
isFlagParam = false
continue
}
if arg == cmd {
break
}
count++
}
return count
}
// readFromEnv is a os.Getenv on steroids
func readFromEnv(keys ...string) string {
for _, key := range keys {
if value, ok := os.LookupEnv(key); ok {
return value
}
}
return ""
}