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set.go
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set.go
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// Copyright 2020 Authors of Hubble
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package config
import (
"encoding/csv"
"errors"
"fmt"
"path/filepath"
"strings"
"github.com/cilium/hubble/cmd/common/config"
"github.com/spf13/cast"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
func newSetCommand(vp *viper.Viper) *cobra.Command {
return &cobra.Command{
Use: "set KEY [VALUE]",
Short: "Set an individual value in the hubble config file",
Long: "Set an individual value in the hubble config file.\n" +
"If VALUE is not provided, the value is reset to its default value.",
ValidArgs: vp.AllKeys(),
RunE: func(cmd *cobra.Command, args []string) error {
var val string
switch len(args) {
case 2:
val = args[1]
fallthrough
case 1:
return runSet(cmd, vp, args[0], val)
default:
return fmt.Errorf("invalid arguments: set requires exactly 1 or 2 argument(s): got '%s'", strings.Join(args, " "))
}
},
}
}
func runSet(cmd *cobra.Command, vp *viper.Viper, key, value string) error {
if !isKey(vp, key) {
return fmt.Errorf("unknown key: %s", key)
}
// each viper key/value entry should be bound to a command flag
flag := cmd.Flag(key)
if flag == nil {
return fmt.Errorf("key=%s not bound to a flag", key)
}
val := value
if value == "" {
val = flag.DefValue
}
var err error
var newVal interface{}
typ := flag.Value.Type()
switch typ {
case "bool":
newVal, err = cast.ToBoolE(val)
case "duration":
newVal, err = cast.ToDurationE(val)
case "int":
newVal, err = cast.ToIntE(val)
case "string":
newVal = val
case "stringSlice":
val = strings.TrimSuffix(strings.TrimPrefix(val, "["), "]")
if val == "" {
newVal = []string{} // csv reader would return io.EOF
} else {
newVal, err = csv.NewReader(strings.NewReader(val)).Read()
}
default:
return fmt.Errorf("unhandeld type %s, please open an issue", typ)
}
if err != nil {
return fmt.Errorf("cannot assign value=%s for key=%s, expected type=%s: %w", value, key, typ, err)
}
// Create a file-only viper config from the configured file to avoid
// writing defaults and/or values set via environment variables or flags.
// This viper config is only used to write the resulting config.
// This method also prevents from writing default values for all keys
// therefore only writing key/value pairs explicitely set by the caller.
configPath := vp.GetString(config.KeyConfig)
fileVP, err := newFileOnlyViper(configPath)
if err != nil {
return err
}
fileVP.Set(key, newVal)
return fileVP.WriteConfigAs(configPath)
}
// newFileOnlyViper creates a new viper config that only reads from the given
// configuration file and is not bound to any environment variable or flag.
func newFileOnlyViper(configPath string) (*viper.Viper, error) {
if configPath == "" {
return nil, errors.New("config file undefined")
}
path := filepath.Clean(configPath)
base := filepath.Base(path)
ext := filepath.Ext(path)
dir := filepath.Dir(path)
filename := strings.TrimSuffix(base, ext)
typ := strings.TrimPrefix(ext, ".")
vp := viper.New()
vp.SetConfigName(filename)
vp.SetConfigType(typ)
vp.AddConfigPath(dir)
if err := vp.ReadInConfig(); err != nil {
// it's OK so long as the failure is ConfigFileNotFound
// for all other cases, failing to read the config should be an error
if _, ok := err.(viper.ConfigFileNotFoundError); !ok {
return nil, err
}
}
return vp, nil
}