/usr/share/gocode/src/go.pedge.io/env/populate.go is in golang-go.pedge-env-dev 0.0~git20171203.5f5a7de-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import (
"fmt"
"os"
"reflect"
"strconv"
"strings"
)
const (
cannotParseErr = "cannot parse"
cannotSetBothRequiredAndDefaultErr = "cannot set both required and default"
duplicateRestrictToKeyErr = "duplicate restrict to key"
envKeyNotSetWhenRequiredErr = "env key not set when required"
expectedPointerErr = "expected pointer"
expectedStructErr = "expected struct"
fieldTypeNotAllowedErr = "field type not allowed"
invalidTagErr = "invalid tag, must be KEY,{required},{default=DEFAULT_VALUE}"
)
func populate(object interface{}, decoders []Decoder) error {
decoderMap, err := getDecoderMap(decoders)
if err != nil {
return err
}
return populateInternal(reflect.ValueOf(object), decoderMap, false)
}
func populateInternal(reflectValue reflect.Value, decoderMap map[string]string, recursive bool) error {
if reflectValue.Type().Kind() == reflect.Ptr {
reflectValue = reflectValue.Elem()
} else if !recursive {
return fmt.Errorf("%s: %v", expectedPointerErr, reflectValue.Type())
}
if reflectValue.Type().Kind() != reflect.Struct {
return fmt.Errorf("%s: %v", expectedStructErr, reflectValue.Type())
}
numField := reflectValue.NumField()
for i := 0; i < numField; i++ {
structField := reflectValue.Type().Field(i)
if structField.Type.Kind() == reflect.Struct {
if err := populateInternal(reflectValue.Field(i), decoderMap, true); err != nil {
return err
}
continue
}
envTag, err := getEnvTag(structField)
if err != nil {
return err
}
if envTag == nil {
continue
}
value := getValue(envTag.key, envTag.defaultValue, decoderMap)
if value == "" {
if envTag.required {
return fmt.Errorf("%s: %s %v", envKeyNotSetWhenRequiredErr, envTag.key, reflectValue.Type())
}
continue
}
parsedValue, err := parseField(structField, value)
if err != nil {
return err
}
reflectValue.Field(i).Set(reflect.ValueOf(parsedValue))
}
return nil
}
func getDecoderMap(decoders []Decoder) (map[string]string, error) {
env := make(map[string]string)
for _, decoder := range decoders {
subEnv, err := decoder.Decode()
if err != nil {
return nil, err
}
for key, value := range subEnv {
if value != "" {
if _, ok := env[key]; !ok {
env[key] = value
}
}
}
}
return env, nil
}
func getValue(key string, defaultValue string, decoderMap map[string]string) string {
value := os.Getenv(key)
if value != "" {
return value
}
value = decoderMap[key]
if value != "" {
return value
}
return defaultValue
}
type envTag struct {
key string
required bool
defaultValue string
}
func getEnvTag(structField reflect.StructField) (*envTag, error) {
tag := structField.Tag.Get("env")
if tag == "" {
return nil, nil
}
split := strings.SplitN(tag, ",", 2)
envTag := &envTag{
key: split[0],
}
if len(split) == 1 {
return envTag, nil
}
split = strings.SplitN(split[1], "=", 2)
switch split[0] {
case "required":
envTag.required = true
case "default":
if len(split) != 2 {
return nil, fmt.Errorf("%s: %s", invalidTagErr, tag)
}
envTag.defaultValue = split[1]
}
return envTag, nil
}
func parseField(structField reflect.StructField, value string) (interface{}, error) {
fieldKind := structField.Type.Kind()
switch fieldKind {
case reflect.Bool:
if value == "" {
return false, nil
}
parsedValue, err := strconv.ParseBool(value)
if err != nil {
return nil, fmt.Errorf("%s: %s", cannotParseErr, err.Error())
}
return parsedValue, nil
case reflect.Int:
parsedValue, err := strconv.ParseInt(value, 10, 0)
if err != nil {
return nil, fmt.Errorf("%s: %s", cannotParseErr, err.Error())
}
return int(parsedValue), nil
case reflect.Int8:
parsedValue, err := strconv.ParseInt(value, 10, 8)
if err != nil {
return nil, fmt.Errorf("%s: %s", cannotParseErr, err.Error())
}
return int8(parsedValue), nil
case reflect.Int16:
parsedValue, err := strconv.ParseInt(value, 10, 16)
if err != nil {
return nil, fmt.Errorf("%s: %s", cannotParseErr, err.Error())
}
return int16(parsedValue), nil
case reflect.Int32:
parsedValue, err := strconv.ParseInt(value, 10, 32)
if err != nil {
return nil, fmt.Errorf("%s: %s", cannotParseErr, err.Error())
}
return int32(parsedValue), nil
case reflect.Int64:
parsedValue, err := strconv.ParseInt(value, 10, 64)
if err != nil {
return nil, fmt.Errorf("%s: %s", cannotParseErr, err.Error())
}
return int64(parsedValue), nil
case reflect.Uint:
parsedValue, err := strconv.ParseUint(value, 10, 0)
if err != nil {
return nil, fmt.Errorf("%s: %s", cannotParseErr, err.Error())
}
return uint(parsedValue), nil
case reflect.Uint8:
parsedValue, err := strconv.ParseUint(value, 10, 8)
if err != nil {
return nil, fmt.Errorf("%s: %s", cannotParseErr, err.Error())
}
return uint8(parsedValue), nil
case reflect.Uint16:
parsedValue, err := strconv.ParseUint(value, 10, 16)
if err != nil {
return nil, fmt.Errorf("%s: %s", cannotParseErr, err.Error())
}
return uint16(parsedValue), nil
case reflect.Uint32:
parsedValue, err := strconv.ParseUint(value, 10, 32)
if err != nil {
return nil, fmt.Errorf("%s: %s", cannotParseErr, err.Error())
}
return uint32(parsedValue), nil
case reflect.Uint64:
parsedValue, err := strconv.ParseUint(value, 10, 64)
if err != nil {
return nil, fmt.Errorf("%s: %s", cannotParseErr, err.Error())
}
return uint64(parsedValue), nil
case reflect.Float32:
parsedValue, err := strconv.ParseFloat(value, 32)
if err != nil {
return nil, fmt.Errorf("%s: %s", cannotParseErr, err.Error())
}
return float32(parsedValue), nil
case reflect.Float64:
parsedValue, err := strconv.ParseFloat(value, 64)
if err != nil {
return nil, fmt.Errorf("%s: %s", cannotParseErr, err.Error())
}
return float64(parsedValue), nil
case reflect.String:
return value, nil
default:
return nil, fmt.Errorf("%s: %v", fieldTypeNotAllowedErr, fieldKind)
}
}
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