/
flatten.go
262 lines (224 loc) · 6.61 KB
/
flatten.go
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package struct2csv
import (
"fmt"
"reflect"
"strconv"
"google.golang.org/protobuf/reflect/protoreflect"
)
// if index = -1, don't use cache map, caller must use append the result to slice
func (s *StructConverter) doFlatten(obj interface{}, index int) (*KeyValue, error) {
var f *KeyValue
if index == -1 {
f = newKeyValue(s.opts.rowSize)
} else {
f = s.kvs.getKVElem(index)
}
key := NewPathBuilder(s.opts.strBuilderCap)
if err := s.flatten(f, obj, key); err != nil {
return nil, err
}
return f, nil
}
func (s *StructConverter) flatten(out *KeyValue, obj interface{}, key PathBuilder) error {
value, ok := obj.(reflect.Value)
if !ok {
value = reflect.ValueOf(obj)
}
for value.Kind() == reflect.Interface {
value = value.Elem()
}
if !value.IsValid() || value.IsZero() {
return nil
}
switch value.Kind() {
case reflect.Map:
return s.flattenMap(out, value, key)
case reflect.Slice, reflect.Array:
return s.flattenSlice(out, value, key)
case reflect.Struct:
return s.flattenStruct(out, value, key)
case reflect.String:
s.set(out, key.String(), value.String())
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
s.set(out, key.String(), value.Int())
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
s.set(out, key.String(), value.Uint())
case reflect.Float32, reflect.Float64:
s.set(out, key.String(), value.Float())
case reflect.Bool:
s.set(out, key.String(), value.Bool())
case reflect.Ptr:
if value.Elem().Kind() == reflect.Struct {
return s.flattenStruct(out, value, key)
} else {
return s.flatten(out, value.Elem(), key)
}
default:
return fmt.Errorf("unknown kind: %s", value.Kind())
}
return nil
}
func (s *StructConverter) flattenMap(out *KeyValue, value reflect.Value, prefix PathBuilder) error {
for _, k := range value.MapKeys() {
vv := value.MapIndex(k)
if !vv.IsValid() || vv.IsZero() {
continue
}
pointer := prefix.Clone(s.opts.strBuilderCap)
pointer.AppendString(k.String())
if err := s.flatten(out, vv, pointer); err != nil {
return err
}
}
return nil
}
func (s *StructConverter) flattenSlice(out *KeyValue, value reflect.Value, prefix PathBuilder) error {
for i := 0; i < value.Len(); i++ {
vv := value.Index(i)
if !vv.IsValid() || vv.IsZero() {
continue
}
pointer := prefix.Clone(s.opts.strBuilderCap)
pointer.AppendString(strconv.Itoa(i))
if err := s.flatten(out, vv, pointer); err != nil {
return err
}
}
return nil
}
func (s *StructConverter) flattenStruct(out *KeyValue, value reflect.Value, prefix PathBuilder) error {
if !value.CanInterface() {
return nil
}
protoValue, ok := protoMessage(value.Interface())
if !ok {
// normal struct
tp := value.Type()
if tp.Kind() == reflect.Ptr {
tp = tp.Elem()
value = value.Elem()
}
for i := 0; i < tp.NumField(); i++ {
f := tp.Field(i)
vv := value.FieldByName(f.Name)
if !vv.IsValid() || vv.IsZero() {
continue
}
pointer := prefix.Clone(s.opts.strBuilderCap)
pointer.AppendString(f.Name)
if err := s.flatten(out, vv, pointer); err != nil {
return err
}
}
return nil
}
// proto struct
return s.flattenProtoStruct(out, protoValue, prefix)
}
// resolve proto struct
func (s *StructConverter) flattenProtoStruct(out *KeyValue, value protoreflect.Value, prefix PathBuilder) error {
msg := value.Message()
var err error
msg.Range(func(fd protoreflect.FieldDescriptor, value protoreflect.Value) bool {
if !value.IsValid() {
return true
}
pointer := prefix.Clone(s.opts.strBuilderCap)
pointer.AppendString(fd.TextName())
err = s.flattenProto(out, fd, value, pointer)
return err == nil
})
return err
}
func (s *StructConverter) flattenProto(out *KeyValue, fd protoreflect.FieldDescriptor, value protoreflect.Value, key PathBuilder) error {
if !value.IsValid() {
return nil
}
normal := func() error {
switch v := value.Interface().(type) {
case protoreflect.Message:
return s.flattenProtoStruct(out, value, key)
case protoreflect.List:
return s.flattenProtoSlice(out, value, key)
case protoreflect.Map:
return s.flattenProtoMap(out, value, key)
case protoreflect.Enum, protoreflect.EnumNumber:
s.set(out, key.String(), int32(value.Enum()))
case int, int8, int16, int32, int64:
s.set(out, key.String(), value.Int())
case uint, uint8, uint16, uint32, uint64:
s.set(out, key.String(), value.Uint())
case float32, float64:
s.set(out, key.String(), value.Float())
case bool:
s.set(out, key.String(), value.Bool())
case string:
s.set(out, key.String(), value.String())
default:
return fmt.Errorf("flattenProto: unknow type %v, value == %#v, keypoint = %v", v, value.Interface(), key.String())
}
return nil
}
if fd == nil {
return normal()
}
if fd.IsList() {
return s.flattenProtoSlice(out, value, key)
}
if fd.IsMap() {
return s.flattenProtoMap(out, value, key)
}
switch fd.Kind() {
case protoreflect.BoolKind:
s.set(out, key.String(), value.Bool())
case protoreflect.EnumKind:
s.set(out, key.String(), value.Enum())
case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed32Kind, protoreflect.Sfixed64Kind:
s.set(out, key.String(), value.Int())
case protoreflect.Uint32Kind, protoreflect.Uint64Kind, protoreflect.Fixed32Kind, protoreflect.Fixed64Kind:
s.set(out, key.String(), value.Uint())
case protoreflect.FloatKind, protoreflect.DoubleKind:
s.set(out, key.String(), value.Float())
case protoreflect.StringKind:
s.set(out, key.String(), value.String())
case protoreflect.MessageKind:
return s.flattenProtoStruct(out, value, key)
}
return nil
}
func (s *StructConverter) flattenProtoSlice(out *KeyValue, value protoreflect.Value, prefix PathBuilder) error {
list := value.List()
for i := 0; i < list.Len(); i++ {
elem := list.Get(i)
if !elem.IsValid() {
continue
}
pointer := prefix.Clone(s.opts.strBuilderCap)
pointer.AppendString(strconv.Itoa(i))
if err := s.flattenProto(out, nil, elem, pointer); err != nil {
return err
}
}
return nil
}
func (s *StructConverter) flattenProtoMap(out *KeyValue, value protoreflect.Value, prefix PathBuilder) error {
var err error
value.Map().Range(func(k protoreflect.MapKey, v protoreflect.Value) bool {
if !v.IsValid() {
return true
}
pointer := prefix.Clone(s.opts.strBuilderCap)
pointer.AppendString(k.String())
err = s.flattenProto(out, nil, v, pointer)
return err == nil
})
return err
}
func (s *StructConverter) set(out *KeyValue, k string, v interface{}) {
kt, ok := s.kvs.mapping[k]
if !ok {
kt = s.headerConv.ConvertHeader(k)
}
s.kvs.mapping[k] = kt
out.Set(kt, v)
}