You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
92 lines
2.9 KiB
92 lines
2.9 KiB
package cli
|
|
|
|
import (
|
|
"os"
|
|
"path/filepath"
|
|
"strings"
|
|
|
|
"github.com/spf13/cobra"
|
|
"github.com/spf13/viper"
|
|
)
|
|
|
|
const (
|
|
HomeFlag = "home"
|
|
TraceFlag = "trace"
|
|
OutputFlag = "output" // used in the cli
|
|
)
|
|
|
|
// PrepareBaseCmd is meant for tendermint and other servers
|
|
func PrepareBaseCmd(cmd *cobra.Command, envPrefix, defaultHome string) *cobra.Command {
|
|
// the primary caller of this command is in the SDK and
|
|
// returning the cobra.Command object avoids breaking that
|
|
// code. In the long term, the SDK could avoid this entirely.
|
|
cobra.OnInitialize(func() { InitEnv(envPrefix) })
|
|
cmd.PersistentFlags().StringP(HomeFlag, "", defaultHome, "directory for config and data")
|
|
cmd.PersistentFlags().Bool(TraceFlag, false, "print out full stack trace on errors")
|
|
cmd.PersistentPreRunE = concatCobraCmdFuncs(BindFlagsLoadViper, cmd.PersistentPreRunE)
|
|
return cmd
|
|
}
|
|
|
|
// InitEnv sets to use ENV variables if set.
|
|
func InitEnv(prefix string) {
|
|
// This copies all variables like TMROOT to TM_ROOT,
|
|
// so we can support both formats for the user
|
|
prefix = strings.ToUpper(prefix)
|
|
ps := prefix + "_"
|
|
for _, e := range os.Environ() {
|
|
kv := strings.SplitN(e, "=", 2)
|
|
if len(kv) == 2 {
|
|
k, v := kv[0], kv[1]
|
|
if strings.HasPrefix(k, prefix) && !strings.HasPrefix(k, ps) {
|
|
k2 := strings.Replace(k, prefix, ps, 1)
|
|
os.Setenv(k2, v)
|
|
}
|
|
}
|
|
}
|
|
|
|
// env variables with TM prefix (eg. TM_ROOT)
|
|
viper.SetEnvPrefix(prefix)
|
|
viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_", "-", "_"))
|
|
viper.AutomaticEnv()
|
|
}
|
|
|
|
type cobraCmdFunc func(cmd *cobra.Command, args []string) error
|
|
|
|
// Returns a single function that calls each argument function in sequence
|
|
// RunE, PreRunE, PersistentPreRunE, etc. all have this same signature
|
|
func concatCobraCmdFuncs(fs ...cobraCmdFunc) cobraCmdFunc {
|
|
return func(cmd *cobra.Command, args []string) error {
|
|
for _, f := range fs {
|
|
if f != nil {
|
|
if err := f(cmd, args); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
}
|
|
|
|
// Bind all flags and read the config into viper
|
|
func BindFlagsLoadViper(cmd *cobra.Command, args []string) error {
|
|
// cmd.Flags() includes flags from this command and all persistent flags from the parent
|
|
if err := viper.BindPFlags(cmd.Flags()); err != nil {
|
|
return err
|
|
}
|
|
|
|
homeDir := viper.GetString(HomeFlag)
|
|
viper.Set(HomeFlag, homeDir)
|
|
viper.SetConfigName("config") // name of config file (without extension)
|
|
viper.AddConfigPath(homeDir) // search root directory
|
|
viper.AddConfigPath(filepath.Join(homeDir, "config")) // search root directory /config
|
|
|
|
// If a config file is found, read it in.
|
|
if err := viper.ReadInConfig(); err == nil {
|
|
// stderr, so if we redirect output to json file, this doesn't appear
|
|
// fmt.Fprintln(os.Stderr, "Using config file:", viper.ConfigFileUsed())
|
|
} else if _, ok := err.(viper.ConfigFileNotFoundError); !ok {
|
|
// ignore not found error, return other errors
|
|
return err
|
|
}
|
|
return nil
|
|
}
|