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config.go
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config.go
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package cmd
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path"
"github.com/cosmos/cosmos-sdk/client/flags"
"github.com/hyperledger-labs/yui-relayer/config"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
func configCmd(ctx *config.Context) *cobra.Command {
cmd := &cobra.Command{
Use: "config",
Aliases: []string{"cfg"},
Short: "manage configuration file",
}
cmd.AddCommand(
configShowCmd(ctx),
configInitCmd(),
)
return cmd
}
// Command for inititalizing an empty config at the --home location
func configInitCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "init",
Aliases: []string{"i"},
Short: "Creates a default home directory at path defined by --home",
RunE: func(cmd *cobra.Command, args []string) error {
home, err := cmd.Flags().GetString(flags.FlagHome)
if err != nil {
return err
}
cfgDir := path.Join(home, "config")
cfgPath := path.Join(cfgDir, "config.yaml")
// If the config doesn't exist...
if _, err := os.Stat(cfgPath); os.IsNotExist(err) {
// And the config folder doesn't exist...
if _, err := os.Stat(cfgDir); os.IsNotExist(err) {
// And the home folder doesn't exist
if _, err := os.Stat(home); os.IsNotExist(err) {
// Create the home folder
if err = os.Mkdir(home, os.ModePerm); err != nil {
return err
}
}
// Create the home config folder
if err = os.Mkdir(cfgDir, os.ModePerm); err != nil {
return err
}
}
// Then create the file...
f, err := os.Create(cfgPath)
if err != nil {
return err
}
defer f.Close()
// And write the default config to that location...
if _, err = f.Write(defaultConfig()); err != nil {
return err
}
// And return no error...
return nil
}
// Otherwise, the config file exists, and an error is returned...
return fmt.Errorf("config already exists: %s", cfgPath)
},
}
return cmd
}
// Command for printing current configuration
func configShowCmd(ctx *config.Context) *cobra.Command {
cmd := &cobra.Command{
Use: "show",
Aliases: []string{"s", "list", "l"},
Short: "Prints current configuration",
RunE: func(cmd *cobra.Command, args []string) error {
home, err := cmd.Flags().GetString(flags.FlagHome)
if err != nil {
return err
}
cfgPath := path.Join(home, "config", "config.yaml")
if _, err := os.Stat(cfgPath); os.IsNotExist(err) {
if _, err := os.Stat(home); os.IsNotExist(err) {
return fmt.Errorf("home path does not exist: %s", home)
}
return fmt.Errorf("config does not exist: %s", cfgPath)
}
out, err := config.MarshalJSON(*ctx.Config)
if err != nil {
return err
}
fmt.Println(string(out))
return nil
},
}
return cmd
}
func defaultConfig() []byte {
bz, err := json.Marshal(config.DefaultConfig())
if err != nil {
panic(err)
}
return bz
}
// initConfig reads in config file and ENV variables if set.
func initConfig(ctx *config.Context, cmd *cobra.Command) error {
home, err := cmd.PersistentFlags().GetString(flags.FlagHome)
if err != nil {
return err
}
cfgPath := path.Join(home, "config", "config.yaml")
if _, err := os.Stat(cfgPath); err == nil {
viper.SetConfigFile(cfgPath)
if err := viper.ReadInConfig(); err == nil {
// read the config file bytes
file, err := ioutil.ReadFile(viper.ConfigFileUsed())
if err != nil {
fmt.Println("Error reading file:", err)
os.Exit(1)
}
// unmarshall them into the struct
err = config.UnmarshalJSON(ctx.Codec, file, ctx.Config)
if err != nil {
fmt.Println("Error unmarshalling config:", err)
os.Exit(1)
}
// ensure config has []*relayer.Chain used for all chain operations
err = config.InitChains(ctx, homePath, debug)
if err != nil {
fmt.Println("Error parsing chain config:", err)
os.Exit(1)
}
}
}
return nil
}