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120 lines
3.3 KiB
120 lines
3.3 KiB
package cmd
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import (
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"fmt"
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"os"
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"strings"
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"github.com/pkg/errors"
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"github.com/spf13/cobra"
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"github.com/spf13/viper"
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"github.com/tendermint/go-data/base58"
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data "github.com/tendermint/go-wire/data"
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)
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/*******
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TODO
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This file should move into go-common or the like as a basis for all cli tools.
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It is here for experimentation of re-use between go-keys and light-client.
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*********/
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const (
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RootFlag = "root"
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OutputFlag = "output"
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EncodingFlag = "encoding"
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)
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func PrepareMainCmd(cmd *cobra.Command, envPrefix, defautRoot string) func() {
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cobra.OnInitialize(func() { initEnv(envPrefix) })
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cmd.PersistentFlags().StringP(RootFlag, "r", defautRoot, "root directory for config and data")
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cmd.PersistentFlags().StringP(EncodingFlag, "e", "hex", "Binary encoding (hex|b64|btc)")
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cmd.PersistentFlags().StringP(OutputFlag, "o", "text", "Output format (text|json)")
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cmd.PersistentPreRunE = multiE(bindFlags, setEncoding, validateOutput, cmd.PersistentPreRunE)
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return func() { execute(cmd) }
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}
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// initEnv sets to use ENV variables if set.
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func initEnv(prefix string) {
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// env variables with TM prefix (eg. TM_ROOT)
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viper.SetEnvPrefix(prefix)
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viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
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viper.AutomaticEnv()
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}
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// execute adds all child commands to the root command 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(cmd *cobra.Command) {
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if err := cmd.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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type wrapE func(cmd *cobra.Command, args []string) error
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func multiE(fs ...wrapE) wrapE {
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return func(cmd *cobra.Command, args []string) error {
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for _, f := range fs {
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if f != nil {
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if err := f(cmd, args); err != nil {
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return err
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}
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}
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}
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return nil
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}
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}
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func bindFlags(cmd *cobra.Command, args []string) error {
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// cmd.Flags() includes flags from this command and all persistent flags from the parent
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if err := viper.BindPFlags(cmd.Flags()); err != nil {
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return err
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}
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// rootDir is command line flag, env variable, or default $HOME/.tlc
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rootDir := viper.GetString("root")
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viper.SetConfigName("config") // name of config file (without extension)
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viper.AddConfigPath(rootDir) // search root directory
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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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// stderr, so if we redirect output to json file, this doesn't appear
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// fmt.Fprintln(os.Stderr, "Using config file:", viper.ConfigFileUsed())
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} else if _, ok := err.(viper.ConfigFileNotFoundError); !ok {
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// we ignore not found error, only parse error
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// stderr, so if we redirect output to json file, this doesn't appear
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fmt.Fprintf(os.Stderr, "%#v", err)
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}
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return nil
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}
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// setEncoding reads the encoding flag
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func setEncoding(cmd *cobra.Command, args []string) error {
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// validate and set encoding
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enc := viper.GetString("encoding")
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switch enc {
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case "hex":
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data.Encoder = data.HexEncoder
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case "b64":
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data.Encoder = data.B64Encoder
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case "btc":
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data.Encoder = base58.BTCEncoder
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default:
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return errors.Errorf("Unsupported encoding: %s", enc)
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}
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return nil
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}
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func validateOutput(cmd *cobra.Command, args []string) error {
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// validate output format
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output := viper.GetString(OutputFlag)
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switch output {
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case "text", "json":
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default:
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return errors.Errorf("Unsupported output format: %s", output)
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}
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return nil
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}
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