/
config.go
140 lines (121 loc) · 3.77 KB
/
config.go
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package common
import (
"context"
"fmt"
"io"
"reflect"
"strconv"
"github.com/sethvargo/go-envconfig"
"gopkg.in/yaml.v3"
)
// Config struct contains configurations for SQUIRRELUP.
// Currently it contains four sections:
// - S3 configuration
// - Encryption configuration
// - Backup configuration
// - Internal configuration
type Config struct {
S3 struct {
Region string `yaml:"region" env:"SQUIRRELUP_S3_REGION,overwrite" default:""`
ID string `yaml:"id" env:"SQUIRRELUP_S3_ID,overwrite" default:""`
Secret string `yaml:"secret" env:"SQUIRRELUP_S3_SECRET,overwrite" default:""`
Token string `yaml:"token" env:"SQUIRRELUP_S3_TOKEN,overwrite" default:""`
} `yaml:"s3"`
Encryption struct {
Pubkey string `yaml:"pubkey" env:"SQUIRRELUP_PUBKEY,overwrite" default:""`
} `yaml:"encryption"`
Backup struct {
Hours float64 `yaml:"hours" env:"SQUIRRELUP_BACKUP_HOURS,overwrite" default:"240"`
Name string `yaml:"name" env:"SQUIRRELUP_BACKUP_FILENAME,overwrite" default:"2006-01-02T15-0700"`
} `yaml:"backup"`
Internal struct {
Reporter ProgressReporter
}
}
func setDefaultValueField(valueof reflect.Value, tag string) error {
switch valueof.Kind() {
case reflect.String:
valueof.SetString(tag)
// case reflect.Int:
// // fmt.Printf("reflect.Int\n")
// if intValue, err := strconv.ParseInt(tag, 10, 64); err == nil {
// valueof.SetInt(intValue)
// }
case reflect.Float64:
if floatValue, err := strconv.ParseFloat(tag, 64); err == nil {
valueof.SetFloat(floatValue)
}
// Add cases for other types if needed
default:
return fmt.Errorf("setDefaultValueField called with an unsupported value of kind '%v'", valueof.Kind())
}
return nil
}
func setDefaultValuesStruct(valueof reflect.Value) error {
typeinfo := valueof.Type()
for i := 0; i < valueof.NumField(); i++ {
field := valueof.Field(i)
tag := typeinfo.Field(i).Tag.Get("default")
// fmt.Printf("%s: default = %s, kind = %v\n", typeinfo.Field(i).Name, tag, field.Kind())
if field.Kind() == reflect.Struct {
if err := setDefaultValuesStruct(field); err != nil {
return err
}
continue
}
if tag == "" {
continue
}
if err := setDefaultValueField(field, tag); err != nil {
return err
}
}
return nil
}
// SetDefaultValues reset Config fields to default values.
// An implementation handling a generic struct:
//
// func setDefaultValues() error {
// if reflect.TypeOf(ptr).Kind() != reflect.Ptr {
// return fmt.Errorf("Not a pointer")
// }
// valueof := reflect.ValueOf(ptr).Elem()
// if ! valueof.IsValid() {
// return fmt.Errorf("setDefaultValues called on a nil pointer")
// }
// fmt.Printf("setDefaultValues: kind = %v\n", valueof.Kind())
// if valueof.Kind() == reflect.Struct {
// if err := setDefaultValuesStruct(valueof); err != nil {
// // fmt.Printf("setDefaultValues: err = %v\n", err)
// return err
// }
// return nil
// }
// return fmt.Errorf("setDefaultValues called with unsupported value of kind '%v'", valueof.Kind())
// }
func (cfg *Config) SetDefaultValues() error {
valueof := reflect.ValueOf(cfg).Elem()
if !valueof.IsValid() {
return fmt.Errorf("SetDefaultValues called on a nil pointer")
}
return setDefaultValuesStruct(valueof)
}
// LoadConfigFromFile loads configuration into a `Config` struct
// from YAML file.
func (cfg *Config) LoadConfigFromFile(file io.Reader) error {
decoder := yaml.NewDecoder(file)
err := decoder.Decode(cfg)
if err != nil {
return fmt.Errorf("LoadConfigFromFile failed: %s", err.Error())
}
return nil
}
// LoadConfigFromEnv loads configuration into a `Config` struct
// from environment variables.
func (cfg *Config) LoadConfigFromEnv() error {
err := envconfig.Process(context.Background(), cfg)
if err != nil {
return fmt.Errorf("LoadConfigFromEnv failed: %s", err.Error())
}
return nil
}