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687 lines
17 KiB
687 lines
17 KiB
package binary
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import (
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"encoding/hex"
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"encoding/json"
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"errors"
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"io"
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"reflect"
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"sync"
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"time"
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. "github.com/tendermint/tendermint/common"
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)
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type TypeInfo struct {
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Type reflect.Type // The type
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// Custom encoder/decoder
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// NOTE: Not used.
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BinaryEncoder Encoder
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BinaryDecoder Decoder
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// If Type is kind reflect.Interface
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ConcreteTypes map[byte]reflect.Type
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// If Type is concrete
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HasTypeByte bool
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TypeByte byte
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}
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// e.g. If o is struct{Foo}{}, return is the Foo interface type.
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func GetTypeFromStructDeclaration(o interface{}) reflect.Type {
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rt := reflect.TypeOf(o)
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if rt.NumField() != 1 {
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panic("Unexpected number of fields in struct-wrapped declaration of type")
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}
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return rt.Field(0).Type
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}
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// If o implements HasTypeByte, returns (true, typeByte)
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func GetTypeByteFromStruct(o interface{}) (hasTypeByte bool, typeByte byte) {
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if _, ok := o.(HasTypeByte); ok {
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return true, o.(HasTypeByte).TypeByte()
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} else {
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return false, byte(0x00)
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}
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}
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// Predeclaration of common types
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var (
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timeType = GetTypeFromStructDeclaration(struct{ time.Time }{})
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)
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const (
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rfc2822 = "Mon Jan 02 15:04:05 -0700 2006"
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)
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// If a type implements TypeByte, the byte is included
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// as the first byte for encoding and decoding.
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// This is primarily used to encode interfaces types.
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// The interface should be declared with RegisterInterface()
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type HasTypeByte interface {
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TypeByte() byte
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}
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// NOTE: do not access typeInfos directly, but call GetTypeInfo()
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var typeInfosMtx sync.Mutex
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var typeInfos = map[reflect.Type]*TypeInfo{}
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func GetTypeInfo(rt reflect.Type) *TypeInfo {
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typeInfosMtx.Lock()
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defer typeInfosMtx.Unlock()
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info := typeInfos[rt]
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if info == nil {
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info = &TypeInfo{Type: rt}
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RegisterType(info)
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}
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return info
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}
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// For use with the RegisterInterface declaration
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type ConcreteType struct {
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O interface{}
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}
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// Must use this to register an interface to properly decode the
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// underlying concrete type.
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func RegisterInterface(o interface{}, args ...interface{}) *TypeInfo {
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it := GetTypeFromStructDeclaration(o)
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if it.Kind() != reflect.Interface {
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panic("RegisterInterface expects an interface")
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}
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concreteTypes := make(map[byte]reflect.Type, 0)
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for _, arg := range args {
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switch arg.(type) {
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case ConcreteType:
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concreteTypeInfo := arg.(ConcreteType)
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concreteType := reflect.TypeOf(concreteTypeInfo.O)
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hasTypeByte, typeByte := GetTypeByteFromStruct(concreteTypeInfo.O)
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//fmt.Println(Fmt("HasTypeByte: %v typeByte: %X type: %X", hasTypeByte, typeByte, concreteType))
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if !hasTypeByte {
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panic(Fmt("Expected concrete type %v to implement HasTypeByte", concreteType))
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}
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if concreteTypes[typeByte] != nil {
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panic(Fmt("Duplicate TypeByte for type %v and %v", concreteType, concreteTypes[typeByte]))
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}
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concreteTypes[typeByte] = concreteType
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default:
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panic(Fmt("Unexpected argument type %v", reflect.TypeOf(arg)))
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}
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}
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typeInfo := &TypeInfo{
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Type: it,
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ConcreteTypes: concreteTypes,
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}
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typeInfos[it] = typeInfo
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return typeInfo
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}
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// Registers and possibly modifies the TypeInfo.
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// NOTE: not goroutine safe, so only call upon program init.
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func RegisterType(info *TypeInfo) *TypeInfo {
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// Also register the dereferenced struct if info.Type is a pointer.
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// Or, if info.Type is not a pointer, register the pointer.
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var rt, ptrRt reflect.Type
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if info.Type.Kind() == reflect.Ptr {
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rt, ptrRt = info.Type.Elem(), info.Type
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} else {
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rt, ptrRt = info.Type, reflect.PtrTo(info.Type)
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}
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// Register the type info
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typeInfos[rt] = info
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typeInfos[ptrRt] = info
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// See if the type implements HasTypeByte
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if rt.Kind() != reflect.Interface && rt.Implements(reflect.TypeOf((*HasTypeByte)(nil)).Elem()) {
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zero := reflect.Zero(rt)
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typeByte := zero.Interface().(HasTypeByte).TypeByte()
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if info.HasTypeByte && info.TypeByte != typeByte {
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panic(Fmt("Type %v expected TypeByte of %X", rt, typeByte))
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} else {
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info.HasTypeByte = true
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info.TypeByte = typeByte
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}
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} else if ptrRt.Implements(reflect.TypeOf((*HasTypeByte)(nil)).Elem()) {
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zero := reflect.Zero(ptrRt)
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typeByte := zero.Interface().(HasTypeByte).TypeByte()
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if info.HasTypeByte && info.TypeByte != typeByte {
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panic(Fmt("Type %v expected TypeByte of %X", ptrRt, typeByte))
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} else {
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info.HasTypeByte = true
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info.TypeByte = typeByte
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}
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}
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return info
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}
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func readReflect(rv reflect.Value, rt reflect.Type, r io.Reader, n *int64, err *error) {
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log.Debug("Read reflect", "type", rt)
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// Get typeInfo
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typeInfo := GetTypeInfo(rt)
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// Custom decoder
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if typeInfo.BinaryDecoder != nil {
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decoded := typeInfo.BinaryDecoder(r, n, err)
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rv.Set(reflect.ValueOf(decoded))
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return
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}
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// Create a new struct if rv is nil pointer.
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if rt.Kind() == reflect.Ptr && rv.IsNil() {
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newRv := reflect.New(rt.Elem())
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rv.Set(newRv)
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rv = newRv
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}
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// Dereference pointer
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// Still addressable, thus settable!
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if rv.Kind() == reflect.Ptr {
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rv, rt = rv.Elem(), rt.Elem()
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}
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// Read TypeByte prefix
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if typeInfo.HasTypeByte {
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typeByte := ReadByte(r, n, err)
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log.Debug("Read typebyte", "typeByte", typeByte)
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if typeByte != typeInfo.TypeByte {
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*err = errors.New(Fmt("Expected TypeByte of %X but got %X", typeInfo.TypeByte, typeByte))
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return
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}
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}
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switch rt.Kind() {
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case reflect.Interface:
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typeByte := ReadByte(r, n, err)
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if *err != nil {
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return
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}
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concreteType, ok := typeInfo.ConcreteTypes[typeByte]
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if !ok {
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panic(Fmt("TypeByte %X not registered for interface %v", typeByte, rt))
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}
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newRv := reflect.New(concreteType)
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readReflect(newRv.Elem(), concreteType, NewPrefixedReader([]byte{typeByte}, r), n, err)
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rv.Set(newRv.Elem())
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case reflect.Slice:
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elemRt := rt.Elem()
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if elemRt.Kind() == reflect.Uint8 {
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// Special case: Byteslices
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byteslice := ReadByteSlice(r, n, err)
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log.Debug("Read byteslice", "bytes", byteslice)
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rv.Set(reflect.ValueOf(byteslice))
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} else {
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// Read length
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length := int(ReadUvarint(r, n, err))
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log.Debug(Fmt("Read length: %v", length))
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sliceRv := reflect.MakeSlice(rt, length, length)
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// Read elems
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for i := 0; i < length; i++ {
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elemRv := sliceRv.Index(i)
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readReflect(elemRv, elemRt, r, n, err)
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}
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rv.Set(sliceRv)
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}
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case reflect.Struct:
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if rt == timeType {
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// Special case: time.Time
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t := ReadTime(r, n, err)
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log.Debug(Fmt("Read time: %v", t))
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rv.Set(reflect.ValueOf(t))
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} else {
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numFields := rt.NumField()
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for i := 0; i < numFields; i++ {
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field := rt.Field(i)
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if field.PkgPath != "" {
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continue
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}
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fieldRv := rv.Field(i)
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readReflect(fieldRv, field.Type, r, n, err)
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}
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}
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case reflect.String:
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str := ReadString(r, n, err)
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log.Debug(Fmt("Read string: %v", str))
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rv.SetString(str)
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case reflect.Int64:
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num := ReadUint64(r, n, err)
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log.Debug(Fmt("Read num: %v", num))
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rv.SetInt(int64(num))
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case reflect.Int32:
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num := ReadUint32(r, n, err)
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log.Debug(Fmt("Read num: %v", num))
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rv.SetInt(int64(num))
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case reflect.Int16:
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num := ReadUint16(r, n, err)
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log.Debug(Fmt("Read num: %v", num))
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rv.SetInt(int64(num))
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case reflect.Int8:
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num := ReadUint8(r, n, err)
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log.Debug(Fmt("Read num: %v", num))
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rv.SetInt(int64(num))
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case reflect.Int:
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num := ReadUvarint(r, n, err)
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log.Debug(Fmt("Read num: %v", num))
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rv.SetInt(int64(num))
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case reflect.Uint64:
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num := ReadUint64(r, n, err)
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log.Debug(Fmt("Read num: %v", num))
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rv.SetUint(uint64(num))
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case reflect.Uint32:
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num := ReadUint32(r, n, err)
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log.Debug(Fmt("Read num: %v", num))
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rv.SetUint(uint64(num))
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case reflect.Uint16:
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num := ReadUint16(r, n, err)
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log.Debug(Fmt("Read num: %v", num))
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rv.SetUint(uint64(num))
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case reflect.Uint8:
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num := ReadUint8(r, n, err)
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log.Debug(Fmt("Read num: %v", num))
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rv.SetUint(uint64(num))
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case reflect.Uint:
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num := ReadUvarint(r, n, err)
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log.Debug(Fmt("Read num: %v", num))
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rv.SetUint(uint64(num))
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default:
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panic(Fmt("Unknown field type %v", rt.Kind()))
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}
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}
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func writeReflect(rv reflect.Value, rt reflect.Type, w io.Writer, n *int64, err *error) {
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// Get typeInfo
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typeInfo := GetTypeInfo(rt)
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// Custom encoder, say for an interface type rt.
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if typeInfo.BinaryEncoder != nil {
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typeInfo.BinaryEncoder(rv.Interface(), w, n, err)
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return
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}
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// Dereference interface
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if rt.Kind() == reflect.Interface {
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rv = rv.Elem()
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rt = rv.Type()
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// If interface type, get typeInfo of underlying type.
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typeInfo = GetTypeInfo(rt)
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}
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// Dereference pointer
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if rt.Kind() == reflect.Ptr {
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rt = rt.Elem()
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rv = rv.Elem()
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}
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// Write TypeByte prefix
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if typeInfo.HasTypeByte {
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WriteByte(typeInfo.TypeByte, w, n, err)
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}
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switch rt.Kind() {
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case reflect.Slice:
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elemRt := rt.Elem()
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if elemRt.Kind() == reflect.Uint8 {
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// Special case: Byteslices
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byteslice := rv.Bytes()
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WriteByteSlice(byteslice, w, n, err)
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} else {
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// Write length
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length := rv.Len()
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WriteUvarint(uint(length), w, n, err)
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// Write elems
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for i := 0; i < length; i++ {
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elemRv := rv.Index(i)
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writeReflect(elemRv, elemRt, w, n, err)
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}
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}
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case reflect.Struct:
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if rt == timeType {
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// Special case: time.Time
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WriteTime(rv.Interface().(time.Time), w, n, err)
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} else {
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numFields := rt.NumField()
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for i := 0; i < numFields; i++ {
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field := rt.Field(i)
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if field.PkgPath != "" {
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continue
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}
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fieldRv := rv.Field(i)
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writeReflect(fieldRv, field.Type, w, n, err)
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}
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}
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case reflect.String:
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WriteString(rv.String(), w, n, err)
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case reflect.Int64:
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WriteInt64(rv.Int(), w, n, err)
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case reflect.Int32:
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WriteInt32(int32(rv.Int()), w, n, err)
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case reflect.Int16:
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WriteInt16(int16(rv.Int()), w, n, err)
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case reflect.Int8:
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WriteInt8(int8(rv.Int()), w, n, err)
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case reflect.Int:
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WriteVarint(int(rv.Int()), w, n, err)
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case reflect.Uint64:
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WriteUint64(rv.Uint(), w, n, err)
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case reflect.Uint32:
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WriteUint32(uint32(rv.Uint()), w, n, err)
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case reflect.Uint16:
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WriteUint16(uint16(rv.Uint()), w, n, err)
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case reflect.Uint8:
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WriteUint8(uint8(rv.Uint()), w, n, err)
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case reflect.Uint:
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WriteUvarint(uint(rv.Uint()), w, n, err)
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default:
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panic(Fmt("Unknown field type %v", rt.Kind()))
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}
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}
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//-----------------------------------------------------------------------------
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func readTypeByteJSON(o interface{}) (typeByte byte, rest interface{}, err error) {
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oSlice, ok := o.([]interface{})
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if !ok {
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err = errors.New(Fmt("Expected type [TypeByte,?] but got type %v", reflect.TypeOf(o)))
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return
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}
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if len(oSlice) != 2 {
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err = errors.New(Fmt("Expected [TypeByte,?] len 2 but got len %v", len(oSlice)))
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return
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}
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typeByte_, ok := oSlice[0].(float64)
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typeByte = byte(typeByte_)
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rest = oSlice[1]
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return
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}
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func readReflectJSON(rv reflect.Value, rt reflect.Type, o interface{}, err *error) {
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log.Debug("Read reflect json", "type", rt)
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// Get typeInfo
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typeInfo := GetTypeInfo(rt)
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// Create a new struct if rv is nil pointer.
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if rt.Kind() == reflect.Ptr && rv.IsNil() {
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newRv := reflect.New(rt.Elem())
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rv.Set(newRv)
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rv = newRv
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}
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// Dereference pointer
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// Still addressable, thus settable!
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if rv.Kind() == reflect.Ptr {
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rv, rt = rv.Elem(), rt.Elem()
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}
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// Read TypeByte prefix
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if typeInfo.HasTypeByte {
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typeByte, rest, err_ := readTypeByteJSON(o)
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if err_ != nil {
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*err = err_
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return
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}
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if typeByte != typeInfo.TypeByte {
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*err = errors.New(Fmt("Expected TypeByte of %X but got %X", typeInfo.TypeByte, byte(typeByte)))
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return
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}
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o = rest
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}
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switch rt.Kind() {
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case reflect.Interface:
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typeByte, _, err_ := readTypeByteJSON(o)
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if err_ != nil {
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*err = err_
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return
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}
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concreteType, ok := typeInfo.ConcreteTypes[typeByte]
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if !ok {
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panic(Fmt("TypeByte %X not registered for interface %v", typeByte, rt))
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}
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newRv := reflect.New(concreteType)
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readReflectJSON(newRv.Elem(), concreteType, o, err)
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rv.Set(newRv.Elem())
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case reflect.Slice:
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elemRt := rt.Elem()
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if elemRt.Kind() == reflect.Uint8 {
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// Special case: Byteslices
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oString, ok := o.(string)
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if !ok {
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*err = errors.New(Fmt("Expected string but got type %v", reflect.TypeOf(o)))
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return
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}
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byteslice, err_ := hex.DecodeString(oString)
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if err_ != nil {
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*err = err_
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return
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}
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log.Debug("Read byteslice", "bytes", byteslice)
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rv.Set(reflect.ValueOf(byteslice))
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} else {
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// Read length
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oSlice, ok := o.([]interface{})
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if !ok {
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*err = errors.New(Fmt("Expected array but got type %v", reflect.TypeOf(o)))
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return
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}
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length := len(oSlice)
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log.Debug(Fmt("Read length: %v", length))
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sliceRv := reflect.MakeSlice(rt, length, length)
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// Read elems
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for i := 0; i < length; i++ {
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elemRv := sliceRv.Index(i)
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readReflectJSON(elemRv, elemRt, oSlice[i], err)
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}
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rv.Set(sliceRv)
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}
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case reflect.Struct:
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if rt == timeType {
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// Special case: time.Time
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str, ok := o.(string)
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if !ok {
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*err = errors.New(Fmt("Expected string but got type %v", reflect.TypeOf(o)))
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return
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}
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log.Debug(Fmt("Read time: %v", str))
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t, err_ := time.Parse(rfc2822, str)
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if err_ != nil {
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*err = err_
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return
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}
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rv.Set(reflect.ValueOf(t))
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} else {
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oMap, ok := o.(map[string]interface{})
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if !ok {
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*err = errors.New(Fmt("Expected map but got type %v", reflect.TypeOf(o)))
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return
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}
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|
// TODO: ensure that all fields are set?
|
|
for name, value := range oMap {
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field, ok := rt.FieldByName(name)
|
|
if !ok {
|
|
*err = errors.New(Fmt("Attempt to set unknown field %v", field.Name))
|
|
return
|
|
}
|
|
// JAE: I don't think golang reflect lets us set unexported fields, but just in case:
|
|
if field.PkgPath != "" {
|
|
*err = errors.New(Fmt("Attempt to set unexported field %v", field.Name))
|
|
return
|
|
}
|
|
fieldRv := rv.FieldByName(name)
|
|
readReflectJSON(fieldRv, field.Type, value, err)
|
|
}
|
|
}
|
|
|
|
case reflect.String:
|
|
str, ok := o.(string)
|
|
if !ok {
|
|
*err = errors.New(Fmt("Expected string but got type %v", reflect.TypeOf(o)))
|
|
return
|
|
}
|
|
log.Debug(Fmt("Read string: %v", str))
|
|
rv.SetString(str)
|
|
|
|
case reflect.Int64, reflect.Int32, reflect.Int16, reflect.Int8, reflect.Int:
|
|
num, ok := o.(float64)
|
|
if !ok {
|
|
*err = errors.New(Fmt("Expected numeric but got type %v", reflect.TypeOf(o)))
|
|
return
|
|
}
|
|
log.Debug(Fmt("Read num: %v", num))
|
|
rv.SetInt(int64(num))
|
|
|
|
case reflect.Uint64, reflect.Uint32, reflect.Uint16, reflect.Uint8, reflect.Uint:
|
|
num, ok := o.(float64)
|
|
if !ok {
|
|
*err = errors.New(Fmt("Expected numeric but got type %v", reflect.TypeOf(o)))
|
|
return
|
|
}
|
|
if num < 0 {
|
|
*err = errors.New(Fmt("Expected unsigned numeric but got %v", num))
|
|
return
|
|
}
|
|
log.Debug(Fmt("Read num: %v", num))
|
|
rv.SetUint(uint64(num))
|
|
|
|
default:
|
|
panic(Fmt("Unknown field type %v", rt.Kind()))
|
|
}
|
|
}
|
|
|
|
func writeReflectJSON(rv reflect.Value, rt reflect.Type, w io.Writer, n *int64, err *error) {
|
|
|
|
// Get typeInfo
|
|
typeInfo := GetTypeInfo(rt)
|
|
|
|
// Dereference interface
|
|
if rt.Kind() == reflect.Interface {
|
|
rv = rv.Elem()
|
|
rt = rv.Type()
|
|
// If interface type, get typeInfo of underlying type.
|
|
typeInfo = GetTypeInfo(rt)
|
|
}
|
|
|
|
// Dereference pointer
|
|
if rt.Kind() == reflect.Ptr {
|
|
rt = rt.Elem()
|
|
rv = rv.Elem()
|
|
}
|
|
|
|
// Write TypeByte prefix
|
|
if typeInfo.HasTypeByte {
|
|
WriteTo([]byte(Fmt("[%v,", typeInfo.TypeByte)), w, n, err)
|
|
}
|
|
|
|
switch rt.Kind() {
|
|
case reflect.Slice:
|
|
elemRt := rt.Elem()
|
|
if elemRt.Kind() == reflect.Uint8 {
|
|
// Special case: Byteslices
|
|
byteslice := rv.Bytes()
|
|
WriteTo([]byte(Fmt("\"%X\"", byteslice)), w, n, err)
|
|
//WriteByteSlice(byteslice, w, n, err)
|
|
} else {
|
|
WriteTo([]byte("["), w, n, err)
|
|
// Write elems
|
|
length := rv.Len()
|
|
for i := 0; i < length; i++ {
|
|
elemRv := rv.Index(i)
|
|
writeReflectJSON(elemRv, elemRt, w, n, err)
|
|
if i < length-1 {
|
|
WriteTo([]byte(","), w, n, err)
|
|
}
|
|
}
|
|
WriteTo([]byte("]"), w, n, err)
|
|
}
|
|
|
|
case reflect.Struct:
|
|
if rt == timeType {
|
|
// Special case: time.Time
|
|
t := rv.Interface().(time.Time)
|
|
str := t.Format(rfc2822)
|
|
jsonBytes, err_ := json.Marshal(str)
|
|
if err_ != nil {
|
|
*err = err_
|
|
return
|
|
}
|
|
WriteTo(jsonBytes, w, n, err)
|
|
} else {
|
|
WriteTo([]byte("{"), w, n, err)
|
|
numFields := rt.NumField()
|
|
wroteField := false
|
|
for i := 0; i < numFields; i++ {
|
|
field := rt.Field(i)
|
|
if field.PkgPath != "" {
|
|
continue
|
|
}
|
|
fieldRv := rv.Field(i)
|
|
if wroteField {
|
|
WriteTo([]byte(","), w, n, err)
|
|
} else {
|
|
wroteField = true
|
|
}
|
|
WriteTo([]byte(Fmt("\"%v\":", field.Name)), w, n, err)
|
|
writeReflectJSON(fieldRv, field.Type, w, n, err)
|
|
}
|
|
WriteTo([]byte("}"), w, n, err)
|
|
}
|
|
|
|
case reflect.String:
|
|
fallthrough
|
|
case reflect.Uint64, reflect.Uint32, reflect.Uint16, reflect.Uint8, reflect.Uint:
|
|
fallthrough
|
|
case reflect.Int64, reflect.Int32, reflect.Int16, reflect.Int8, reflect.Int:
|
|
jsonBytes, err_ := json.Marshal(rv.Interface())
|
|
if err_ != nil {
|
|
*err = err_
|
|
return
|
|
}
|
|
WriteTo(jsonBytes, w, n, err)
|
|
|
|
default:
|
|
panic(Fmt("Unknown field type %v", rt.Kind()))
|
|
}
|
|
|
|
// Write TypeByte close bracket
|
|
if typeInfo.HasTypeByte {
|
|
WriteTo([]byte("]"), w, n, err)
|
|
}
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|