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config_decoder.go
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/
config_decoder.go
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// Copyright (c) 2022 Cisco and/or its affiliates.
//
// SPDX-License-Identifier: Apache-2.0
//
// 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 awarenessgroups provides awareness groups specific tools
package awarenessgroups
import (
"net/url"
"strings"
"github.com/pkg/errors"
)
// Decoder allows to parse [][]*url.URL from string. Can be used for env configuration.
// See at https://github.com/kelseyhightower/envconfig#custom-decoders
type Decoder [][]*url.URL
// Decode parses values from passed string.
func (d *Decoder) Decode(value string) error {
value = strings.ReplaceAll(value, " ", "")
if value == "" {
return nil
}
if err := validateParentheses(value); err != nil {
return err
}
lists := strings.Split(value, "],[")
awarenessGroups := make([][]*url.URL, len(lists))
for i, list := range lists {
list = strings.Trim(list, "[]")
groupItems := strings.Split(list, ",")
for _, item := range groupItems {
if item == "" {
return errors.New("empty nsurl")
}
nsurl, err := url.Parse(item)
if err != nil {
return err
}
awarenessGroups[i] = append(awarenessGroups[i], nsurl)
}
}
*d = Decoder(awarenessGroups)
return nil
}
// TODO: write validation fuction for awarenessGroups values
func validateParentheses(value string) error {
i := 0
length := len(value)
if length < 2 {
return errors.New("value is too short")
}
parenthesesCounter := 0
for ; i < length; i++ {
if value[i] == '[' {
if parenthesesCounter == 1 {
return errors.Errorf("unexpected character: %c", value[i])
}
parenthesesCounter++
} else if value[i] == ']' {
if parenthesesCounter == 0 {
return errors.Errorf("unexpected character: %c", value[i])
}
if i+1 == length {
return nil
}
if i+2 == length {
return errors.New("unexpected end of value")
}
if value[i+1] != ',' {
return errors.Errorf("unexpected character: %c", value[i+1])
}
if value[i+2] != '[' {
return errors.Errorf("unexpected character: %c", value[i+2])
}
parenthesesCounter--
}
}
if parenthesesCounter != 0 {
return errors.New("parenteses are not balanced")
}
return nil
}