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codec_record.go
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codec_record.go
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package avro
import (
"errors"
"fmt"
"io"
"reflect"
"unsafe"
"github.com/modern-go/reflect2"
)
func createDecoderOfRecord(d *decoderContext, schema Schema, typ reflect2.Type) ValDecoder {
switch typ.Kind() {
case reflect.Struct:
return decoderOfStruct(d, schema, typ)
case reflect.Map:
if typ.(reflect2.MapType).Key().Kind() != reflect.String ||
typ.(reflect2.MapType).Elem().Kind() != reflect.Interface {
break
}
return decoderOfRecord(d, schema, typ)
case reflect.Ptr:
return decoderOfPtr(d, schema, typ)
case reflect.Interface:
if ifaceType, ok := typ.(*reflect2.UnsafeIFaceType); ok {
return &recordIfaceDecoder{schema: schema, valType: ifaceType}
}
}
return &errorDecoder{err: fmt.Errorf("avro: %s is unsupported for avro %s", typ.String(), schema.Type())}
}
func createEncoderOfRecord(e *encoderContext, schema *RecordSchema, typ reflect2.Type) ValEncoder {
switch typ.Kind() {
case reflect.Struct:
return encoderOfStruct(e, schema, typ)
case reflect.Map:
if typ.(reflect2.MapType).Key().Kind() != reflect.String ||
typ.(reflect2.MapType).Elem().Kind() != reflect.Interface {
break
}
return encoderOfRecord(e, schema, typ)
case reflect.Ptr:
return encoderOfPtr(e, schema, typ)
}
return &errorEncoder{err: fmt.Errorf("avro: %s is unsupported for avro %s", typ.String(), schema.Type())}
}
func decoderOfStruct(d *decoderContext, schema Schema, typ reflect2.Type) ValDecoder {
rec := schema.(*RecordSchema)
structDesc := describeStruct(d.cfg.getTagKey(), typ)
fields := make([]*structFieldDecoder, 0, len(rec.Fields()))
for _, field := range rec.Fields() {
if field.action == FieldIgnore {
fields = append(fields, &structFieldDecoder{
decoder: createSkipDecoder(field.Type()),
})
continue
}
sf := structDesc.Fields.Get(field.Name())
if sf == nil {
for _, alias := range field.Aliases() {
sf = structDesc.Fields.Get(alias)
if sf != nil {
break
}
}
}
// Skip field if it doesnt exist
if sf == nil {
fields = append(fields, &structFieldDecoder{
decoder: createSkipDecoder(field.Type()),
})
continue
}
if field.action == FieldSetDefault {
if field.hasDef {
fields = append(fields, &structFieldDecoder{
field: sf.Field,
decoder: createDefaultDecoder(d, field, sf.Field[len(sf.Field)-1].Type()),
})
continue
}
}
dec := decoderOfType(d, field.Type(), sf.Field[len(sf.Field)-1].Type())
fields = append(fields, &structFieldDecoder{
field: sf.Field,
decoder: dec,
})
}
return &structDecoder{typ: typ, fields: fields}
}
type structFieldDecoder struct {
field []*reflect2.UnsafeStructField
decoder ValDecoder
}
type structDecoder struct {
typ reflect2.Type
fields []*structFieldDecoder
}
func (d *structDecoder) Decode(ptr unsafe.Pointer, r *Reader) {
for _, field := range d.fields {
// Skip case
if field.field == nil {
field.decoder.Decode(nil, r)
continue
}
fieldPtr := ptr
for i, f := range field.field {
fieldPtr = f.UnsafeGet(fieldPtr)
if i == len(field.field)-1 {
break
}
if f.Type().Kind() == reflect.Ptr {
if *((*unsafe.Pointer)(fieldPtr)) == nil {
newPtr := f.Type().(*reflect2.UnsafePtrType).Elem().UnsafeNew()
*((*unsafe.Pointer)(fieldPtr)) = newPtr
}
fieldPtr = *((*unsafe.Pointer)(fieldPtr))
}
}
field.decoder.Decode(fieldPtr, r)
if r.Error != nil && !errors.Is(r.Error, io.EOF) {
for _, f := range field.field {
r.Error = fmt.Errorf("%s: %w", f.Name(), r.Error)
return
}
}
}
}
func encoderOfStruct(e *encoderContext, rec *RecordSchema, typ reflect2.Type) ValEncoder {
structDesc := describeStruct(e.cfg.getTagKey(), typ)
fields := make([]*structFieldEncoder, 0, len(rec.Fields()))
for _, field := range rec.Fields() {
sf := structDesc.Fields.Get(field.Name())
if sf != nil {
fields = append(fields, &structFieldEncoder{
field: sf.Field,
encoder: encoderOfType(e, field.Type(), sf.Field[len(sf.Field)-1].Type()),
})
continue
}
if !field.HasDefault() {
// In all other cases, this is a required field
err := fmt.Errorf("avro: record %s is missing required field %q", rec.FullName(), field.Name())
return &errorEncoder{err: err}
}
def := field.Default()
if field.Default() == nil {
if field.Type().Type() == Null {
// We write nothing in a Null case, just skip it
continue
}
if field.Type().Type() == Union && field.Type().(*UnionSchema).Nullable() {
defaultType := reflect2.TypeOf(&def)
fields = append(fields, &structFieldEncoder{
defaultPtr: reflect2.PtrOf(&def),
encoder: encoderOfNullableUnion(e, field.Type(), defaultType),
})
continue
}
}
defaultType := reflect2.TypeOf(def)
defaultEncoder := encoderOfType(e, field.Type(), defaultType)
if defaultType.LikePtr() {
defaultEncoder = &onePtrEncoder{defaultEncoder}
}
fields = append(fields, &structFieldEncoder{
defaultPtr: reflect2.PtrOf(def),
encoder: defaultEncoder,
})
}
return &structEncoder{typ: typ, fields: fields}
}
type structFieldEncoder struct {
field []*reflect2.UnsafeStructField
defaultPtr unsafe.Pointer
encoder ValEncoder
}
type structEncoder struct {
typ reflect2.Type
fields []*structFieldEncoder
}
func (e *structEncoder) Encode(ptr unsafe.Pointer, w *Writer) {
for _, field := range e.fields {
// Default case
if field.field == nil {
field.encoder.Encode(field.defaultPtr, w)
continue
}
fieldPtr := ptr
for i, f := range field.field {
fieldPtr = f.UnsafeGet(fieldPtr)
if i == len(field.field)-1 {
break
}
if f.Type().Kind() == reflect.Ptr {
if *((*unsafe.Pointer)(fieldPtr)) == nil {
w.Error = fmt.Errorf("embedded field %q is nil", f.Name())
return
}
fieldPtr = *((*unsafe.Pointer)(fieldPtr))
}
}
field.encoder.Encode(fieldPtr, w)
if w.Error != nil && !errors.Is(w.Error, io.EOF) {
for _, f := range field.field {
w.Error = fmt.Errorf("%s: %w", f.Name(), w.Error)
return
}
}
}
}
func decoderOfRecord(d *decoderContext, schema Schema, typ reflect2.Type) ValDecoder {
rec := schema.(*RecordSchema)
mapType := typ.(*reflect2.UnsafeMapType)
fields := make([]recordMapDecoderField, len(rec.Fields()))
for i, field := range rec.Fields() {
switch field.action {
case FieldIgnore:
fields[i] = recordMapDecoderField{
name: field.Name(),
decoder: createSkipDecoder(field.Type()),
skip: true,
}
continue
case FieldSetDefault:
if field.hasDef {
fields[i] = recordMapDecoderField{
name: field.Name(),
decoder: createDefaultDecoder(d, field, mapType.Elem()),
}
continue
}
}
fields[i] = recordMapDecoderField{
name: field.Name(),
decoder: decoderOfType(d, field.Type(), mapType.Elem()),
}
}
return &recordMapDecoder{
mapType: mapType,
elemType: mapType.Elem(),
fields: fields,
}
}
type recordMapDecoderField struct {
name string
decoder ValDecoder
skip bool
}
type recordMapDecoder struct {
mapType *reflect2.UnsafeMapType
elemType reflect2.Type
fields []recordMapDecoderField
}
func (d *recordMapDecoder) Decode(ptr unsafe.Pointer, r *Reader) {
if d.mapType.UnsafeIsNil(ptr) {
d.mapType.UnsafeSet(ptr, d.mapType.UnsafeMakeMap(len(d.fields)))
}
for _, field := range d.fields {
elemPtr := d.elemType.UnsafeNew()
field.decoder.Decode(elemPtr, r)
if field.skip {
continue
}
d.mapType.UnsafeSetIndex(ptr, reflect2.PtrOf(field), elemPtr)
}
if r.Error != nil && !errors.Is(r.Error, io.EOF) {
r.Error = fmt.Errorf("%v: %w", d.mapType, r.Error)
}
}
func encoderOfRecord(e *encoderContext, rec *RecordSchema, typ reflect2.Type) ValEncoder {
mapType := typ.(*reflect2.UnsafeMapType)
fields := make([]mapEncoderField, len(rec.Fields()))
for i, field := range rec.Fields() {
fields[i] = mapEncoderField{
name: field.Name(),
hasDef: field.HasDefault(),
def: field.Default(),
encoder: encoderOfType(e, field.Type(), mapType.Elem()),
}
if field.HasDefault() {
switch {
case field.Type().Type() == Union:
union := field.Type().(*UnionSchema)
fields[i].def = map[string]any{
string(union.Types()[0].Type()): field.Default(),
}
case field.Default() == nil:
continue
}
defaultType := reflect2.TypeOf(fields[i].def)
fields[i].defEncoder = encoderOfType(e, field.Type(), defaultType)
if defaultType.LikePtr() {
fields[i].defEncoder = &onePtrEncoder{fields[i].defEncoder}
}
}
}
return &recordMapEncoder{
mapType: mapType,
fields: fields,
}
}
type mapEncoderField struct {
name string
hasDef bool
def any
defEncoder ValEncoder
encoder ValEncoder
}
type recordMapEncoder struct {
mapType *reflect2.UnsafeMapType
fields []mapEncoderField
}
func (e *recordMapEncoder) Encode(ptr unsafe.Pointer, w *Writer) {
for _, field := range e.fields {
// The first property of mapEncoderField is the name, so a pointer
// to field is a pointer to the name.
valPtr := e.mapType.UnsafeGetIndex(ptr, reflect2.PtrOf(field))
if valPtr == nil {
// Missing required field
if !field.hasDef {
w.Error = fmt.Errorf("avro: missing required field %s", field.name)
return
}
// Null default
if field.def == nil {
continue
}
defPtr := reflect2.PtrOf(field.def)
field.defEncoder.Encode(defPtr, w)
continue
}
field.encoder.Encode(valPtr, w)
if w.Error != nil && !errors.Is(w.Error, io.EOF) {
w.Error = fmt.Errorf("%s: %w", field.name, w.Error)
return
}
}
}
type recordIfaceDecoder struct {
schema Schema
valType *reflect2.UnsafeIFaceType
}
func (d *recordIfaceDecoder) Decode(ptr unsafe.Pointer, r *Reader) {
obj := d.valType.UnsafeIndirect(ptr)
if reflect2.IsNil(obj) {
r.ReportError("decode non empty interface", "can not unmarshal into nil")
return
}
r.ReadVal(d.schema, obj)
}
type structDescriptor struct {
Type reflect2.Type
Fields structFields
}
type structFields []*structField
func (sf structFields) Get(name string) *structField {
for _, f := range sf {
if f.Name == name {
return f
}
}
return nil
}
type structField struct {
Name string
Field []*reflect2.UnsafeStructField
anon *reflect2.UnsafeStructType
}
func describeStruct(tagKey string, typ reflect2.Type) *structDescriptor {
structType := typ.(*reflect2.UnsafeStructType)
fields := structFields{}
var curr []structField
next := []structField{{anon: structType}}
visited := map[uintptr]bool{}
for len(next) > 0 {
curr, next = next, curr[:0]
for _, f := range curr {
rtype := f.anon.RType()
if visited[f.anon.RType()] {
continue
}
visited[rtype] = true
for i := 0; i < f.anon.NumField(); i++ {
field := f.anon.Field(i).(*reflect2.UnsafeStructField)
isUnexported := field.PkgPath() != ""
chain := make([]*reflect2.UnsafeStructField, len(f.Field)+1)
copy(chain, f.Field)
chain[len(f.Field)] = field
if field.Anonymous() {
t := field.Type()
if t.Kind() == reflect.Ptr {
t = t.(*reflect2.UnsafePtrType).Elem()
}
if t.Kind() != reflect.Struct {
continue
}
next = append(next, structField{Field: chain, anon: t.(*reflect2.UnsafeStructType)})
continue
}
// Ignore unexported fields.
if isUnexported {
continue
}
fieldName := field.Name()
if tag, ok := field.Tag().Lookup(tagKey); ok {
fieldName = tag
}
fields = append(fields, &structField{
Name: fieldName,
Field: chain,
})
}
}
}
return &structDescriptor{
Type: structType,
Fields: fields,
}
}