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configuration.go
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configuration.go
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package configuration
import (
"encoding/json"
"errors"
"fmt"
"io/fs"
"os"
"reflect"
"runtime"
"strconv"
"strings"
"github.com/blueprintue/discord-bot/healthchecks"
"github.com/blueprintue/discord-bot/welcome"
)
var (
ErrDiscordName = errors.New("invalid json value: discord.name is empty")
ErrDiscordToken = errors.New("invalid json value: discord.token is empty")
ErrLogFilename = errors.New("invalid json value: log.filename is empty")
ErrLogLevel = errors.New("invalid json value: log.level is invalid")
)
// Support only field's type string, int, bool, []string
// Configuration contains Discord, Log and Modules parameters.
type Configuration struct {
Discord `json:"discord"`
Log `json:"log"`
Modules `json:"modules"`
}
type Discord struct {
Name string `env:"DBOT_DISCORD_NAME" json:"name"`
Token string `env:"DBOT_DISCORD_TOKEN" json:"token"`
}
type Log struct {
Filename string `env:"DBOT_LOG_FILENAME" json:"filename"`
Level string `env:"DBOT_LOG_LEVEL" json:"level"`
NumberFilesRotation int `env:"DBOT_LOG_NUMBER_FILES_ROTATION" json:"number_files_rotation"`
}
type Modules struct {
WelcomeConfiguration welcome.Configuration `json:"welcome"`
HealthcheckConfiguration healthchecks.Configuration `json:"healthchecks"`
}
// ReadConfiguration read `config.json` file and update values with env if found.
func ReadConfiguration(fsys fs.FS, filename string) (*Configuration, error) {
filedata, err := fs.ReadFile(fsys, filename)
if err != nil {
return nil, fmt.Errorf("%w", err)
}
config := Configuration{}
//nolint:musttag
err = json.Unmarshal(filedata, &config)
if err != nil {
return nil, fmt.Errorf("%w", err)
}
eraseConfigurationValuesWithEnv(&config)
err = checkBasicConfiguration(config)
if err != nil {
return nil, err
}
return &config, nil
}
//nolint:cyclop
func eraseConfigurationValuesWithEnv(obj any) {
var val reflect.Value
if reflect.TypeOf(obj).Kind() == reflect.Ptr {
val = reflect.ValueOf(obj).Elem()
} else {
val = reflect.ValueOf(obj)
}
for idxNumField := 0; idxNumField < val.NumField(); idxNumField++ {
if val.Field(idxNumField).Kind() == reflect.Struct {
eraseConfigurationValuesWithEnv(val.Field(idxNumField).Addr().Interface())
continue
}
envKey := reflect.TypeOf(obj).Elem().Field(idxNumField).Tag.Get("env")
envValue, ok := os.LookupEnv(envKey)
if !ok {
continue
}
//nolint:exhaustive
switch val.Field(idxNumField).Kind() {
case reflect.String:
val.Field(idxNumField).SetString(envValue)
case reflect.Int:
intEnvValue, err := strconv.Atoi(envValue)
if err == nil {
val.Field(idxNumField).SetInt(int64(intEnvValue))
}
case reflect.Bool:
boolEnvValue, err := strconv.ParseBool(envValue)
if err == nil {
val.Field(idxNumField).SetBool(boolEnvValue)
}
case reflect.Slice:
splitter := ":"
if runtime.GOOS == "windows" {
splitter = ";"
}
stringEnvValues := strings.Split(envValue, splitter)
val.Field(idxNumField).Set(reflect.MakeSlice(val.Field(idxNumField).Type(), len(stringEnvValues), len(stringEnvValues)))
for idxSlice := 0; idxSlice < len(stringEnvValues); idxSlice++ {
val.Field(idxNumField).Index(idxSlice).SetString(stringEnvValues[idxSlice])
}
}
}
}
func checkBasicConfiguration(config Configuration) error {
if config.Discord.Name == "" {
return ErrDiscordName
}
if config.Discord.Token == "" {
return ErrDiscordToken
}
if config.Log.Filename == "" {
return ErrLogFilename
}
isValidLogLevel := false
validLogLevelValue := []string{"", "trace", "debug", "info", "warn", "error", "fatal", "panic"}
for _, levelValue := range validLogLevelValue {
if config.Log.Level == levelValue {
isValidLogLevel = true
}
}
if !isValidLogLevel {
return ErrLogLevel
}
return nil
}