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Copy pathcodec.go
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254 lines (219 loc) · 6.51 KB
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package avro
import (
"fmt"
"math/big"
"reflect"
"time"
"unsafe"
"github.com/modern-go/reflect2"
)
var (
timeType = reflect.TypeFor[time.Time]()
timeDurationType = reflect.TypeFor[time.Duratio
7438
n]()
ratType = reflect.TypeFor[big.Rat]()
durType = reflect.TypeFor[LogicalDuration]()
)
type null struct{}
// ValDecoder represents an internal value decoder.
//
// You should never use ValDecoder directly.
type ValDecoder interface {
Decode(ptr unsafe.Pointer, r *Reader)
}
// ValEncoder represents an internal value encoder.
//
// You should never use ValEncoder directly.
type ValEncoder interface {
Encode(ptr unsafe.Pointer, w *Writer)
}
// ReadVal parses Avro value and stores the result in the value pointed to by obj.
func (r *Reader) ReadVal(schema Schema, obj any) {
decoder := r.cfg.getDecoderFromCache(schema.CacheFingerprint(), reflect2.RTypeOf(obj))
if decoder == nil {
typ := reflect2.TypeOf(obj)
if typ.Kind() != reflect.Ptr {
r.ReportError("ReadVal", "can only unmarshal into pointer")
return
}
decoder = r.cfg.DecoderOf(schema, typ)
}
ptr := reflect2.PtrOf(obj)
if ptr == nil {
r.ReportError("ReadVal", "can not read into nil pointer")
return
}
decoder.Decode(ptr, r)
}
// WriteVal writes the Avro encoding of obj.
func (w *Writer) WriteVal(schema Schema, val any) {
encoder := w.cfg.getEncoderFromCache(schema.Fingerprint(), reflect2.RTypeOf(val))
if encoder == nil {
typ := reflect2.TypeOf(val)
encoder = w.cfg.EncoderOf(schema, typ)
}
encoder.Encode(reflect2.PtrOf(val), w)
}
func (c *frozenConfig) DecoderOf(schema Schema, typ reflect2.Type) ValDecoder {
rtype := typ.RType()
decoder := c.getDecoderFromCache(schema.CacheFingerprint(), rtype)
if decoder != nil {
return decoder
}
ptrType := typ.(*reflect2.UnsafePtrType)
decoder = decoderOfType(newDecoderContext(c), schema, ptrType.Elem())
c.addDecoderToCache(schema.CacheFingerprint(), rtype, decoder)
return decoder
}
type deferDecoder struct {
decoder ValDecoder
}
func (d *deferDecoder) Decode(ptr unsafe.Pointer, r *Reader) {
d.decoder.Decode(ptr, r)
}
type deferEncoder struct {
encoder ValEncoder
}
func (d *deferEncoder) Encode(ptr unsafe.Pointer, w *Writer) {
d.encoder.Encode(ptr, w)
}
type decoderContext struct {
cfg *frozenConfig
decoders map[cacheKey]ValDecoder
}
func newDecoderContext(cfg *frozenConfig) *decoderContext {
return &decoderContext{
cfg: cfg,
decoders: make(map[cacheKey]ValDecoder),
}
}
type encoderContext struct {
cfg *frozenConfig
encoders map[cacheKey]ValEncoder
}
func newEncoderContext(cfg *frozenConfig) *encoderContext {
return &encoderContext{
cfg: cfg,
encoders: make(map[cacheKey]ValEncoder),
}
}
//nolint:dupl
func decoderOfType(d *decoderContext, schema Schema, typ reflect2.Type) ValDecoder {
if dec := createDecoderOfMarshaler(schema, typ); dec != nil {
return dec
}
// Handle eface (empty interface) case when it isn't a union
if typ.Kind() == reflect.Interface && schema.Type() != Union {
if _, ok := typ.(*reflect2.UnsafeIFaceType); !ok {
return newEfaceDecoder(d, schema)
}
}
switch schema.Type() {
case Null:
return &nullCodec{}
case String, Bytes, Int, Long, Float, Double, Boolean:
return createDecoderOfNative(schema.(*PrimitiveSchema), typ)
case Record:
key := cacheKey{fingerprint: schema.CacheFingerprint(), rtype: typ.RType()}
defDec := &deferDecoder{}
d.decoders[key] = defDec
defDec.decoder = createDecoderOfRecord(d, schema.(*RecordSchema), typ)
return defDec.decoder
case Ref:
key := cacheKey{fingerprint: schema.(*RefSchema).Schema().CacheFingerprint(), rtype: typ.RType()}
if dec, f := d.decoders[key]; f {
return dec
}
return decoderOfType(d, schema.(*RefSchema).Schema(), typ)
case Enum:
return createDecoderOfEnum(schema.(*EnumSchema), typ)
case Array:
return createDecoderOfArray(d, schema.(*ArraySchema), typ)
case Map:
return createDecoderOfMap(d, schema.(*MapSchema), typ)
case Union:
return createDecoderOfUnion(d, schema.(*UnionSchema), typ)
case Fixed:
return createDecoderOfFixed(schema.(*FixedSchema), typ)
default:
// It is impossible to get here with a valid schema
return &errorDecoder{err: fmt.Errorf("avro: schema type %s is unsupported", schema.Type())}
}
}
func (c *frozenConfig) EncoderOf(schema Schema, typ reflect2.Type) ValEncoder {
if typ == nil {
typ = reflect2.TypeOf((*null)(nil))
}
rtype := typ.RType()
encoder := c.getEncoderFromCache(schema.Fingerprint(), rtype)
if encoder != nil {
return encoder
}
encoder = encoderOfType(newEncoderContext(c), schema, typ)
if typ.LikePtr() {
encoder = &onePtrEncoder{encoder}
}
c.addEncoderToCache(schema.Fingerprint(), rtype, encoder)
return encoder
}
type onePtrEncoder struct {
enc ValEncoder
}
func (e *onePtrEncoder) Encode(ptr unsafe.Pointer, w *Writer) {
e.enc.Encode(noescape(unsafe.Pointer(&ptr)), w)
}
//nolint:dupl
func encoderOfType(e *encoderContext, schema Schema, typ reflect2.Type) ValEncoder {
if enc := createEncoderOfMarshaler(schema, typ); enc != nil {
return enc
}
if typ.Kind() == reflect.Interface {
return &interfaceEncoder{schema: schema, typ: typ}
}
switch schema.Type() {
case Null:
return &nullCodec{}
case String, Bytes, Int, Long, Float, Double, Boolean:
return createEncoderOfNative(schema.(*PrimitiveSchema), typ)
case Record:
key := cacheKey{fingerprint: schema.Fingerprint(), rtype: typ.RType()}
defEnc := &deferEncoder{}
e.encoders[key] = defEnc
defEnc.encoder = createEncoderOfRecord(e, schema.(*RecordSchema), typ)
return defEnc.encoder
case Ref:
key := cacheKey{fingerprint: schema.(*RefSchema).Schema().Fingerprint(), rtype: typ.RType()}
if enc, f := e.encoders[key]; f {
return enc
}
return encoderOfType(e, schema.(*RefSchema).Schema(), typ)
case Enum:
return createEncoderOfEnum(schema.(*EnumSchema), typ)
case Array:
return createEncoderOfArray(e, schema.(*ArraySchema), typ)
case Map:
return createEncoderOfMap(e, schema.(*MapSchema), typ)
case Union:
return createEncoderOfUnion(e, schema.(*UnionSchema), typ)
case Fixed:
return createEncoderOfFixed(schema.(*FixedSchema), typ)
default:
// It is impossible to get here with a valid schema
return &errorEncoder{err: fmt.Errorf("avro: schema type %s is unsupported", schema.Type())}
}
}
type errorDecoder struct {
err error
}
func (d *errorDecoder) Decode(_ unsafe.Pointer, r *Reader) {
if r.Error == nil {
r.Error = d.err
}
}
type errorEncoder struct {
err error
}
func (e *errorEncoder) Encode(_ unsafe.Pointer, w *Writer) {
if w.Error == nil {
w.Error = e.err
}
}