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775 lines
19 KiB
775 lines
19 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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// If Type is kind reflect.Interface, is registered
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IsRegisteredInterface bool
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ByteToType map[byte]reflect.Type
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TypeToByte map[reflect.Type]byte
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// If Type is concrete
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Byte byte
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// If Type is kind reflect.Struct
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Fields []StructFieldInfo
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}
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type StructFieldInfo struct {
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Index int // Struct field index
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JSONName string // Corresponding JSON field name. (override with `json=""`)
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Type reflect.Type // Struct field type
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}
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func (info StructFieldInfo) unpack() (int, string, reflect.Type) {
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return info.Index, info.JSONName, info.Type
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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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func SetByteForType(typeByte byte, rt reflect.Type) {
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typeInfo := GetTypeInfo(rt)
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if typeInfo.Byte != 0x00 && typeInfo.Byte != typeByte {
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panic(Fmt("Type %v already registered with type byte %X", rt, typeByte))
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}
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typeInfo.Byte = typeByte
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// If pointer, we need to set it for the concrete type as well.
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if rt.Kind() == reflect.Ptr {
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SetByteForType(typeByte, rt.Elem())
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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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// 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 = MakeTypeInfo(rt)
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typeInfos[rt] = 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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Byte byte
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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{}, ctypes ...ConcreteType) *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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toType := make(map[byte]reflect.Type, 0)
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toByte := make(map[reflect.Type]byte, 0)
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for _, ctype := range ctypes {
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crt := reflect.TypeOf(ctype.O)
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typeByte := ctype.Byte
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SetByteForType(typeByte, crt)
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if typeByte == 0x00 {
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panic(Fmt("Byte of 0x00 is reserved for nil (%v)", ctype))
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}
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if toType[typeByte] != nil {
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panic(Fmt("Duplicate Byte for type %v and %v", ctype, toType[typeByte]))
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}
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toType[typeByte] = crt
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toByte[crt] = typeByte
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}
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typeInfo := &TypeInfo{
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Type: it,
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IsRegisteredInterface: true,
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ByteToType: toType,
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TypeToByte: toByte,
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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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func MakeTypeInfo(rt reflect.Type) *TypeInfo {
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info := &TypeInfo{Type: rt}
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// If struct, register field name options
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if rt.Kind() == reflect.Struct {
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numFields := rt.NumField()
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structFields := []StructFieldInfo{}
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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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jsonName := field.Tag.Get("json")
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if jsonName == "-" {
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continue
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} else if jsonName == "" {
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jsonName = field.Name
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}
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structFields = append(structFields, StructFieldInfo{
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Index: i,
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JSONName: jsonName,
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Type: field.Type,
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})
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}
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info.Fields = structFields
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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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// Get typeInfo
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typeInfo := GetTypeInfo(rt)
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if rt.Kind() == reflect.Interface {
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if !typeInfo.IsRegisteredInterface {
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// There's no way we can read such a thing.
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*err = errors.New(Fmt("Cannot read unregistered interface type %v", rt))
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return
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}
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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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if typeByte == 0x00 {
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return // nil
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}
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crt, ok := typeInfo.ByteToType[typeByte]
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if !ok {
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*err = errors.New(Fmt("Unexpected type byte %X for type %v", typeByte, rt))
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return
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}
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crv := reflect.New(crt).Elem()
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r = NewPrefixedReader([]byte{typeByte}, r)
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readReflect(crv, crt, r, n, err)
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rv.Set(crv) // NOTE: orig rv is ignored.
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return
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}
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if rt.Kind() == reflect.Ptr {
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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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if typeByte == 0x00 {
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return // nil
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}
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// Create new if rv is nil.
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if 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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rv, rt = rv.Elem(), rt.Elem()
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typeInfo = GetTypeInfo(rt)
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if typeInfo.Byte != 0x00 {
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r = NewPrefixedReader([]byte{typeByte}, r)
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}
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// continue...
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}
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// Read Byte prefix
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if typeInfo.Byte != 0x00 {
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typeByte := ReadByte(r, n, err)
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if typeByte != typeInfo.Byte {
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*err = errors.New(Fmt("Expected Byte of %X but got %X", typeInfo.Byte, 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.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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case reflect.Bool:
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num := ReadUint8(r, n, err)
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log.Debug(Fmt("Read bool: %v", num))
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rv.SetBool(num > 0)
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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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// rv: the reflection value of the thing to write
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// rt: the type of rv as declared in the container, not necessarily rv.Type().
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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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if rt.Kind() == reflect.Interface {
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if rv.IsNil() {
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// XXX ensure that typeByte 0 is reserved.
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WriteByte(0x00, w, n, err)
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return
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}
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crv := rv.Elem() // concrete reflection value
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crt := crv.Type() // concrete reflection type
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if typeInfo.IsRegisteredInterface {
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// See if the crt is registered.
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// If so, we're more restrictive.
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_, ok := typeInfo.TypeToByte[crt]
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if !ok {
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switch crt.Kind() {
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case reflect.Ptr:
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*err = errors.New(Fmt("Unexpected pointer type %v. Was it registered as a value receiver rather than as a pointer receiver?", crt))
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case reflect.Struct:
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*err = errors.New(Fmt("Unexpected struct type %v. Was it registered as a pointer receiver rather than as a value receiver?", crt))
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default:
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*err = errors.New(Fmt("Unexpected type %v.", crt))
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}
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return
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}
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} else {
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// We support writing unsafely for convenience.
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}
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// We don't have to write the typeByte here,
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// the writeReflect() call below will write it.
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writeReflect(crv, crt, w, n, err)
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return
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}
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if rt.Kind() == reflect.Ptr {
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// Dereference pointer
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rv, rt = rv.Elem(), rt.Elem()
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typeInfo = GetTypeInfo(rt)
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if !rv.IsValid() {
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WriteByte(0x00, w, n, err)
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return
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}
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if typeInfo.Byte == 0x00 {
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WriteByte(0x01, w, n, err)
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// continue...
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} else {
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// continue...
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}
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}
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// Write type byte
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if typeInfo.Byte != 0x00 {
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WriteByte(typeInfo.Byte, w, n, err)
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}
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// All other types
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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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case reflect.Bool:
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if rv.Bool() {
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WriteUint8(uint8(1), w, n, err)
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} else {
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WriteUint8(uint8(0), w, n, err)
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}
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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 readByteJSON(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 [Byte,?] 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 [Byte,?] 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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// Get typeInfo
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typeInfo := GetTypeInfo(rt)
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if rt.Kind() == reflect.Interface {
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if !typeInfo.IsRegisteredInterface {
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// There's no way we can read such a thing.
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*err = errors.New(Fmt("Cannot read unregistered interface type %v", rt))
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return
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}
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if o == nil {
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return // nil
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}
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typeByte, _, err_ := readByteJSON(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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crt, ok := typeInfo.ByteToType[typeByte]
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if !ok {
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*err = errors.New(Fmt("Byte %X not registered for interface %v", typeByte, rt))
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return
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}
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crv := reflect.New(crt).Elem()
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readReflectJSON(crv, crt, o, err)
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rv.Set(crv) // NOTE: orig rv is ignored.
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return
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}
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if rt.Kind() == reflect.Ptr {
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if o == nil {
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return // nil
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}
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// Create new struct if rv is nil.
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if 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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rv, rt = rv.Elem(), rt.Elem()
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typeInfo = GetTypeInfo(rt)
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// continue...
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}
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|
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// Read Byte prefix
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if typeInfo.Byte != 0x00 {
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typeByte, rest, err_ := readByteJSON(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.Byte {
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*err = errors.New(Fmt("Expected Byte of %X but got %X", typeInfo.Byte, 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.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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}
|
|
byteslice, err_ := hex.DecodeString(oString)
|
|
if err_ != nil {
|
|
*err = err_
|
|
return
|
|
}
|
|
log.Debug("Read byteslice", "bytes", byteslice)
|
|
rv.Set(reflect.ValueOf(byteslice))
|
|
} else {
|
|
// Read length
|
|
oSlice, ok := o.([]interface{})
|
|
if !ok {
|
|
*err = errors.New(Fmt("Expected array of %v but got type %v", rt, reflect.TypeOf(o)))
|
|
return
|
|
}
|
|
length := len(oSlice)
|
|
log.Debug(Fmt("Read length: %v", length))
|
|
sliceRv := reflect.MakeSlice(rt, length, length)
|
|
// Read elems
|
|
for i := 0; i < length; i++ {
|
|
elemRv := sliceRv.Index(i)
|
|
readReflectJSON(elemRv, elemRt, oSlice[i], err)
|
|
}
|
|
rv.Set(sliceRv)
|
|
}
|
|
|
|
case reflect.Struct:
|
|
if rt == timeType {
|
|
// Special case: time.Time
|
|
str, ok := o.(string)
|
|
if !ok {
|
|
*err = errors.New(Fmt("Expected string but got type %v", reflect.TypeOf(o)))
|
|
return
|
|
}
|
|
log.Debug(Fmt("Read time: %v", str))
|
|
t, err_ := time.Parse(rfc2822, str)
|
|
if err_ != nil {
|
|
*err = err_
|
|
return
|
|
}
|
|
rv.Set(reflect.ValueOf(t))
|
|
} else {
|
|
oMap, ok := o.(map[string]interface{})
|
|
if !ok {
|
|
*err = errors.New(Fmt("Expected map but got type %v", reflect.TypeOf(o)))
|
|
return
|
|
}
|
|
// TODO: ensure that all fields are set?
|
|
// TODO: disallow unknown oMap fields?
|
|
for _, fieldInfo := range typeInfo.Fields {
|
|
i, jsonName, fieldType := fieldInfo.unpack()
|
|
value, ok := oMap[jsonName]
|
|
if !ok {
|
|
continue // Skip missing fields.
|
|
}
|
|
fieldRv := rv.Field(i)
|
|
readReflectJSON(fieldRv, fieldType, 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))
|
|
|
|
case reflect.Bool:
|
|
bl, ok := o.(bool)
|
|
if !ok {
|
|
*err = errors.New(Fmt("Expected boolean but got type %v", reflect.TypeOf(o)))
|
|
return
|
|
}
|
|
log.Debug(Fmt("Read boolean: %v", bl))
|
|
rv.SetBool(bl)
|
|
|
|
default:
|
|
panic(Fmt("Unknown field type %v", rt.Kind()))
|
|
}
|
|
}
|
|
|
|
func writeReflectJSON(rv reflect.Value, rt reflect.Type, w io.Writer, n *int64, err *error) {
|
|
log.Debug(Fmt("writeReflectJSON(%v, %v, %v, %v, %v)", rv, rt, w, n, err))
|
|
|
|
// Get typeInfo
|
|
typeInfo := GetTypeInfo(rt)
|
|
|
|
if rt.Kind() == reflect.Interface {
|
|
if rv.IsNil() {
|
|
// XXX ensure that typeByte 0 is reserved.
|
|
WriteTo([]byte("null"), w, n, err)
|
|
return
|
|
}
|
|
crv := rv.Elem() // concrete reflection value
|
|
crt := crv.Type() // concrete reflection type
|
|
if typeInfo.IsRegisteredInterface {
|
|
// See if the crt is registered.
|
|
// If so, we're more restrictive.
|
|
_, ok := typeInfo.TypeToByte[crt]
|
|
if !ok {
|
|
switch crt.Kind() {
|
|
case reflect.Ptr:
|
|
*err = errors.New(Fmt("Unexpected pointer type %v. Was it registered as a value receiver rather than as a pointer receiver?", crt))
|
|
case reflect.Struct:
|
|
*err = errors.New(Fmt("Unexpected struct type %v. Was it registered as a pointer receiver rather than as a value receiver?", crt))
|
|
default:
|
|
*err = errors.New(Fmt("Unexpected type %v.", crt))
|
|
}
|
|
return
|
|
}
|
|
} else {
|
|
// We support writing unsafely for convenience.
|
|
}
|
|
// We don't have to write the typeByte here,
|
|
// the writeReflectJSON() call below will write it.
|
|
writeReflectJSON(crv, crt, w, n, err)
|
|
return
|
|
}
|
|
|
|
if rt.Kind() == reflect.Ptr {
|
|
// Dereference pointer
|
|
rv, rt = rv.Elem(), rt.Elem()
|
|
typeInfo = GetTypeInfo(rt)
|
|
if !rv.IsValid() {
|
|
WriteTo([]byte("null"), w, n, err)
|
|
return
|
|
}
|
|
// continue...
|
|
}
|
|
|
|
// Write Byte
|
|
if typeInfo.Byte != 0x00 {
|
|
WriteTo([]byte(Fmt("[%v,", typeInfo.Byte)), w, n, err)
|
|
defer WriteTo([]byte("]"), w, n, err)
|
|
}
|
|
|
|
// All other types
|
|
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)
|
|
wroteField := false
|
|
for _, fieldInfo := range typeInfo.Fields {
|
|
i, jsonName, fieldType := fieldInfo.unpack()
|
|
fieldRv := rv.Field(i)
|
|
if wroteField {
|
|
WriteTo([]byte(","), w, n, err)
|
|
} else {
|
|
wroteField = true
|
|
}
|
|
WriteTo([]byte(Fmt("\"%v\":", jsonName)), w, n, err)
|
|
writeReflectJSON(fieldRv, fieldType, 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:
|
|
fallthrough
|
|
case reflect.Bool:
|
|
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()))
|
|
}
|
|
|
|
}
|