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// Copyright 2025 Google Inc. All Rights Reserved.
//
// 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 remoteconfig
import (
"slices"
"strconv"
"strings"
)
// ValueSource represents the source of a value.
type ValueSource int
// Constants for value source.
const (
sourceUnspecified ValueSource = iota
Static // Static represents a statically defined value.
Remote // Remote represents a value fetched from a remote source.
Default // Default represents a default value.
)
// Value defines the interface for configuration values.
type value struct {
source ValueSource
value string
}
// Default values for different parameter types.
const (
DefaultValueForBoolean = false
DefaultValueForString = ""
DefaultValueForNumber = 0
)
var booleanTruthyValues = []string{"1", "true", "t", "yes", "y", "on"}
// ServerConfig is the implementation of the ServerConfig interface.
type ServerConfig struct {
configValues map[string]value
}
// NewServerConfig creates a new ServerConfig instance.
func newServerConfig(configValues map[string]value) *ServerConfig {
return &ServerConfig{configValues: configValues}
}
// GetBoolean returns the boolean value associated with the given key.
//
// It returns true if the string value is "1", "true", "t", "yes", "y", or "on" (case-insensitive).
// Otherwise, or if the key is not found, it returns the default boolean value (false).
func (s *ServerConfig) GetBoolean(key string) bool {
return s.getValue(key).asBoolean()
}
// GetInt returns the integer value associated with the given key.
//
// If the parameter value cannot be parsed as an integer, or if the key is not found,
// it returns the default numeric value (0).
func (s *ServerConfig) GetInt(key string) int {
return s.getValue(key).asInt()
}
// GetFloat returns the float value associated with the given key.
//
// If the parameter value cannot be parsed as a float64, or if the key is not found,
// it returns the default float value (0).
func (s *ServerConfig) GetFloat(key string) float64 {
return s.getValue(key).asFloat()
}
// GetString returns the string value associated with the given key.
//
// If the key is not found, it returns the default string value ("").
func (s *ServerConfig) GetString(key string) string {
return s.getValue(key).asString()
}
// GetValueSource returns the source of the value.
func (s *ServerConfig) GetValueSource(key string) ValueSource {
return s.getValue(key).source
}
// getValue returns the value associated with the given key.
func (s *ServerConfig) getValue(key string) *value {
if val, ok := s.configValues[key]; ok {
return &val
}
return newValue(Static, DefaultValueForString)
}
// newValue creates a new value instance.
func newValue(source ValueSource, customValue string) *value {
if customValue == "" {
customValue = DefaultValueForString
}
return &value{source: source, value: customValue}
}
// asString returns the value as a string.
func (v *value) asString() string {
return v.value
}
// asBoolean returns the value as a boolean.
func (v *value) asBoolean() bool {
if v.source == Static {
return DefaultValueForBoolean
}
return slices.Contains(booleanTruthyValues, strings.ToLower(v.value))
}
// asInt returns the value as an integer.
func (v *value) asInt() int {
if v.source == Static {
return DefaultValueForNumber
}
num, err := strconv.Atoi(v.value)
if err != nil {
return DefaultValueForNumber
}
return num
}
// asFloat returns the value as a float.
func (v *value) asFloat() float64 {
if v.source == Static {
return DefaultValueForNumber
}
num, err := strconv.ParseFloat(v.value, doublePrecision)
if err != nil {
return DefaultValueForNumber
}
return num
}
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