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Copy pathtype_collection.go
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type_collection.go
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package envconf
import (
"errors"
"fmt"
"reflect"
"strconv"
"strings"
"github.com/antonmashko/envconf/external"
"github.com/antonmashko/envconf/option"
)
type collectionDefiner interface {
fromInterface(interface{}, option.ConfigSource) (interface{}, error)
fromString(string, option.ConfigSource) (interface{}, error)
withoutValue() (interface{}, error)
}
type collectionType struct {
*configField
cd collectionDefiner
v reflect.Value
ext external.ExternalSource
}
func newCollectionType(v reflect.Value, f *configField, cd collectionDefiner) *collectionType {
return &collectionType{
configField: f,
v: v,
cd: cd,
ext: external.NilContainer{},
}
}
func (c *collectionType) externalSource() external.ExternalSource {
return c.ext
}
func (c *collectionType) defineItem(v reflect.Value, cf *configField) error {
f := createFieldFromValue(v, cf)
if err := f.init(); err != nil {
return err
}
c.parser.fieldInitialized(f)
if err := f.define(); err != nil {
c.parser.fieldNotDefined(f, err)
return err
}
c.parser.fieldDefined(f)
return nil
}
func (c *collectionType) init() error {
return c.configField.init(c)
}
func (c *collectionType) define() error {
if c.parent() != nil {
c.ext = external.AsExternalSource(c.Name, c.parent().externalSource())
}
var err error
v, cs := c.Value()
switch cs {
case option.NoConfigValue:
v, err = c.cd.withoutValue()
case option.ExternalSource:
v, err = c.cd.fromInterface(v, cs)
default:
// value specified for entire collection
str, ok := v.(string)
if !ok {
return ErrUnsupportedType
}
v, err = c.cd.fromString(str, cs)
}
if err != nil {
return err
}
return c.set(v, cs)
}
type sliceType struct {
*collectionType
}
func newSliceType(v reflect.Value, f *configField) *sliceType {
sl := &sliceType{}
col := newCollectionType(v, f, sl)
sl.collectionType = col
return sl
}
func (s *sliceType) fromString(value string, cs option.ConfigSource) (interface{}, error) {
if s.v.Type().Elem().Kind() == reflect.Uint8 {
// bytes
s.v.SetBytes([]byte(value))
return value, nil
}
sl := strings.Split(value, ",")
switch s.v.Kind() {
case reflect.Array:
if len(sl) > s.v.Len() {
return nil, errors.New("elements in value more than len of array")
}
case reflect.Slice:
s.v.Set(reflect.MakeSlice(s.v.Type(), len(sl), cap(sl)))
}
for i := range sl {
rv := s.v.Index(i)
st := newDefinedConfigField(sl[i], cs, s,
reflect.StructField{Name: strconv.Itoa(i), Type: rv.Type()}, s.parser)
err := s.defineItem(rv, st)
if err != nil {
return nil, err
}
}
return sl, nil
}
func (s *sliceType) fromInterface(v interface{}, cs option.ConfigSource) (interface{}, error) {
if cs != option.ExternalSource {
return nil, ErrUnsupportedType
}
return s.rescan(cs)
}
func (s *sliceType) withoutValue() (interface{}, error) {
return s.rescan(option.NoConfigValue)
}
func (s *sliceType) rescan(cs option.ConfigSource) (interface{}, error) {
if !s.v.CanInterface() {
return nil, errors.New("reflect: cannot interface")
}
for i := 0; i < s.v.Len(); i++ {
rv := s.v.Index(i)
if !rv.CanInterface() {
return nil, errors.New("reflect: cannot interface")
}
st := newDefinedConfigField(rv.Interface(), cs, s,
reflect.StructField{Name: strconv.Itoa(i), Type: rv.Type()}, s.parser)
err := s.defineItem(rv, st)
if err != nil {
return nil, err
}
}
return s.v.Interface(), nil
}
type mapType struct {
*collectionType
}
func newMapType(v reflect.Value, f *configField) *mapType {
mp := &mapType{}
col := newCollectionType(v, f, mp)
mp.collectionType = col
return mp
}
func (m *mapType) fromString(value string, cs option.ConfigSource) (interface{}, error) {
sl := strings.Split(value, ",")
vt := m.v.Type()
rmp := reflect.MakeMap(vt)
rkeyType := vt.Key()
rvalType := vt.Elem()
for i := range sl {
idx := strings.IndexRune(sl[i], ':')
var key, value string
if idx == -1 {
key = sl[i]
} else {
key = sl[i][:idx]
value = sl[i][idx+1:]
}
rvkey, _, err := createFromString(rkeyType, key)
if err != nil {
return nil, err
}
st := newDefinedConfigField(value, cs, m,
reflect.StructField{Name: fmt.Sprint(key), Type: rvalType}, m.parser)
rvvalue := reflect.New(rvalType).Elem()
err = m.defineItem(rvvalue, st)
if err != nil {
return nil, err
}
rmp.SetMapIndex(rvkey, rvvalue)
}
m.v.Set(rmp)
return sl, nil
}
func (m *mapType) fromInterface(v interface{}, cs option.ConfigSource) (interface{}, error) {
if cs != option.ExternalSource {
return nil, ErrUnsupportedType
}
return m.rescan(cs)
}
func (m *mapType) withoutValue() (interface{}, error) {
return m.rescan(option.NoConfigValue)
}
func (m *mapType) rescan(cs option.ConfigSource) (interface{}, error) {
if !m.v.CanInterface() {
return nil, errors.New("reflect: cannot interface")
}
mp := m.v.MapRange()
for mp.Next() {
rkey := mp.Key()
rval := mp.Value()
if !rkey.CanInterface() {
return nil, errors.New("reflect: cannot interface map.Key")
}
if !rval.CanInterface() {
return nil, errors.New("reflect: cannot interface map.Value")
}
st := newDefinedConfigField(rval.Interface(), cs, m,
reflect.StructField{Name: fmt.Sprint(rkey.Interface()), Type: rval.Type()}, m.parser)
err := m.defineItem(rval, st)
if err != nil {
return nil, err
}
}
return m.v.Interface(), nil
}