/
types.go
788 lines (752 loc) · 17.4 KB
/
types.go
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// this file implemented wrap/unwrap between go types and proto Any type
package protos
import (
"bytes"
"errors"
"fmt"
"io"
"reflect"
"strconv"
"unsafe"
)
type UnsupportTypeErr struct {
Type reflect.Type
}
func (e *UnsupportTypeErr)Error()(string){
return fmt.Sprintf("Unsupport type %s (%s)", e.Type.String(), e.Type.Kind().String())
}
type UnknownTypeErr struct {
Type string
}
func (e *UnknownTypeErr)Error()(string){
return fmt.Sprintf("Unknown type %s", e.Type)
}
var ErrIncorrectFormat = errors.New("Incorrect format")
var boolType = reflect.TypeOf((bool)(false))
var intType = reflect.TypeOf((int)(0))
var int8Type = reflect.TypeOf((int8)(0))
var int16Type = reflect.TypeOf((int16)(0))
var int32Type = reflect.TypeOf((int32)(0))
var int64Type = reflect.TypeOf((int64)(0))
var uintType = reflect.TypeOf((uint)(0))
var uint8Type = reflect.TypeOf((uint8)(0))
var uint16Type = reflect.TypeOf((uint16)(0))
var uint32Type = reflect.TypeOf((uint32)(0))
var uint64Type = reflect.TypeOf((uint64)(0))
var uintptrType = reflect.TypeOf((uintptr)(0))
var float32Type = reflect.TypeOf((float32)(0))
var float64Type = reflect.TypeOf((float64)(0))
var complex64Type = reflect.TypeOf((complex64)(0))
var complex128Type = reflect.TypeOf((complex128)(0))
var stringType = reflect.TypeOf((string)(""))
var anyType = reflect.TypeOf((*any)(nil)).Elem()
var typeRegisterMap = map[string]reflect.Type{}
var typeToStringMap = map[reflect.Type]string{}
func RegisterType(v any){
t := reflect.TypeOf(v)
if t.Kind() == reflect.Pointer && t.PkgPath() == "" {
t = t.Elem()
}
name := t.PkgPath()
if len(name) == 0 {
panic("Type is not exported")
}
name += "." + t.Name()
typeRegisterMap[name] = t
buf := bytes.NewBuffer(nil)
if err := reflectTypeToString(t, buf); err != nil {
panic(err)
}
typeToStringMap[t] = buf.String()
}
func getTypeRegisteredName(t reflect.Type)(name string, ok bool){
if t.Kind() == reflect.Pointer && t.PkgPath() == "" {
t = t.Elem()
}
if name = t.PkgPath(); name != "" {
name += "." + t.Name()
if _, ok = typeRegisterMap[name]; !ok {
return "", false
}
return
}
switch t.Kind() {
case reflect.Bool,
reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr,
reflect.Float32, reflect.Float64,
reflect.Complex64, reflect.Complex128, reflect.String:
return "", true // builtin type, or alias of builtin type
}
return "", false
}
func reflectTypeToString(t reflect.Type, buf *bytes.Buffer)(err error){
if tstr, ok := typeToStringMap[t]; ok {
// use cached string
buf.WriteString(tstr)
return
}
switch t.Kind() {
case reflect.Bool: buf.WriteString("B"); return
case reflect.Int: buf.WriteString("i"); return
case reflect.Int8: buf.WriteString("i8"); return
case reflect.Int16: buf.WriteString("i16"); return
case reflect.Int32: buf.WriteString("i32"); return
case reflect.Int64: buf.WriteString("i64"); return
case reflect.Uint: buf.WriteString("u"); return
case reflect.Uint8: buf.WriteString("u8"); return
case reflect.Uint16: buf.WriteString("u16"); return
case reflect.Uint32: buf.WriteString("u32"); return
case reflect.Uint64: buf.WriteString("u64"); return
case reflect.Uintptr: buf.WriteString("uptr"); return
case reflect.Float32: buf.WriteString("f32"); return
case reflect.Float64: buf.WriteString("f64"); return
case reflect.Complex64: buf.WriteString("c64"); return
case reflect.Complex128: buf.WriteString("c128"); return
case reflect.String: buf.WriteString("str"); return
case reflect.Pointer:
buf.WriteByte('*')
return reflectTypeToString(t.Elem(), buf)
case reflect.Slice:
buf.WriteString("[]")
return reflectTypeToString(t.Elem(), buf)
case reflect.Array:
buf.WriteByte('[')
buf.WriteString(strconv.Itoa(t.Len()))
buf.WriteByte(']')
return reflectTypeToString(t.Elem(), buf)
case reflect.Map:
buf.WriteString("map[")
if err = reflectTypeToString(t.Key(), buf); err != nil {
return
}
buf.WriteByte(']')
return reflectTypeToString(t.Elem(), buf)
case reflect.Struct:
buf.WriteString("struct{")
var flag bool = false
for i, l := 0, t.NumField(); i < l; i++ {
f := t.Field(i)
if !f.IsExported() {
continue
}
if flag {
buf.WriteByte(';')
}else{
flag = true
}
buf.WriteString(f.Name)
buf.WriteByte(' ')
if err = reflectTypeToString(f.Type, buf); err != nil {
return
}
}
buf.WriteByte('}')
return
case reflect.Interface:
if t.NumMethod() == 0 { // only support `interface{}` or `any`
buf.WriteString("any")
return
}
return &UnsupportTypeErr{t}
default:
return &UnsupportTypeErr{t}
}
}
type typeScanner struct {
r io.ByteScanner
peekLit string
peekTk int // 0: invaild; 1: literal; 2: other
}
func newTypeScanner(r io.ByteScanner)(s *typeScanner){
return &typeScanner{
r: r,
}
}
func isLiteralByte(b byte)(bool){
return ('0' <= b && b <= '9') || ('A' <= b && b <= 'Z') || ('a' <= b && b <= 'z')
}
func (s *typeScanner)parseNext()(lit string, tk int, err error){
b, err := s.r.ReadByte()
if err != nil {
return
}
bts := []byte{b}
if !isLiteralByte(b) {
return (string)(bts), 2, nil
}
for {
b, err = s.r.ReadByte()
if err != nil {
if err == io.EOF {
err = nil
break
}
return
}
if !isLiteralByte(b) {
if err = s.r.UnreadByte(); err != nil {
return
}
break
}
bts = append(bts, b)
}
return (string)(bts), 1, nil
}
func (s *typeScanner)next()(lit string, tk int, err error){
if s.peekTk != 0 {
lit, tk = s.peekLit, s.peekTk
s.peekTk = 0
return
}
return s.parseNext()
}
func (s *typeScanner)peek()(lit string, tk int, err error){
if s.peekTk == 0 {
if s.peekLit, s.peekTk, err = s.parseNext(); err != nil {
s.peekTk = 0
return
}
}
lit, tk = s.peekLit, s.peekTk
return
}
func scanToReflectType(r *typeScanner)(t reflect.Type, err error){
lit, tk, err := r.next()
if err != nil {
return
}
if tk == 1 {
switch lit {
case "B": return boolType, nil
case "i": return intType, nil
case "i8": return int8Type, nil
case "i16": return int16Type, nil
case "i32": return int32Type, nil
case "i64": return int64Type, nil
case "u": return uintType, nil
case "u8": return uint8Type, nil
case "u16": return uint16Type, nil
case "u32": return uint32Type, nil
case "u64": return uint64Type, nil
case "uptr": return uintptrType, nil
case "f32": return float32Type, nil
case "f64": return float64Type, nil
case "c64": return complex64Type, nil
case "c128": return complex128Type, nil
case "str": return stringType, nil
case "any": return anyType, nil
case "map":
var key, val reflect.Type
if lit, tk, err = r.next(); err != nil {
return
}
if lit != "[" {
return nil, ErrIncorrectFormat
}
if key, err = scanToReflectType(r); err != nil {
return
}
if lit, tk, err = r.next(); err != nil {
return
}
if lit != "]" {
return nil, ErrIncorrectFormat
}
if val, err = scanToReflectType(r); err != nil {
return
}
t = reflect.MapOf(key, val)
return
case "struct":
panic("TODO: support struct")
}
}else{
if lit == "*" {
if t, err = scanToReflectType(r); err != nil {
return
}
t = reflect.PointerTo(t)
return
}else if lit == "[" {
if lit, tk, err = r.next(); err != nil {
return
}
if tk == 1 { // scanned a number which means it's an array type
var l int
if l, err = strconv.Atoi(lit); err != nil {
return
}
if lit, tk, err = r.next(); err != nil {
return
}
if lit != "]" {
return nil, ErrIncorrectFormat
}
if t, err = scanToReflectType(r); err != nil {
return
}
t = reflect.ArrayOf(l, t)
}else{ // if it's a slice
if lit != "]" {
return nil, ErrIncorrectFormat
}
if t, err = scanToReflectType(r); err != nil {
return
}
t = reflect.SliceOf(t)
}
return
}
}
return nil, &UnknownTypeErr{lit}
}
func writeUint32(buf *bytes.Buffer, v uint32){
buf.Write([]byte{
(byte)((v >> 24) & 0xff),
(byte)((v >> 16) & 0xff),
(byte)((v >> 8) & 0xff),
(byte)(v & 0xff),
})
}
func readUint32(buf *bytes.Reader)(v uint32, err error){
var b [4]byte
if _, err = io.ReadFull(buf, b[:]); err != nil {
return
}
v =
((uint32)(b[0]) << 24) |
((uint32)(b[1]) << 16) |
((uint32)(b[2]) << 8) |
(uint32)(b[3])
return
}
func writeUint64(buf *bytes.Buffer, v uint64){
buf.Write([]byte{
(byte)((v >> 56) & 0xff),
(byte)((v >> 48) & 0xff),
(byte)((v >> 40) & 0xff),
(byte)((v >> 32) & 0xff),
(byte)((v >> 24) & 0xff),
(byte)((v >> 16) & 0xff),
(byte)((v >> 8) & 0xff),
(byte)(v & 0xff),
})
}
func readUint64(buf *bytes.Reader)(v uint64, err error){
var b [8]byte
if _, err = io.ReadFull(buf, b[:]); err != nil {
return
}
v =
((uint64)(b[0]) << 56) |
((uint64)(b[1]) << 48) |
((uint64)(b[2]) << 40) |
((uint64)(b[3]) << 32) |
((uint64)(b[4]) << 24) |
((uint64)(b[5]) << 16) |
((uint64)(b[6]) << 8) |
(uint64)(b[7])
return
}
func writeFloat32(buf *bytes.Buffer, v float32){
writeUint32(buf, *((*uint32)((unsafe.Pointer)(&v))))
}
func readFloat32(buf *bytes.Reader)(v float32, err error){
v0, err := readUint32(buf)
if err != nil {
return
}
return *((*float32)((unsafe.Pointer)(&v0))), nil
}
func writeFloat64(buf *bytes.Buffer, v float64){
writeUint64(buf, *((*uint64)((unsafe.Pointer)(&v))))
}
func readFloat64(buf *bytes.Reader)(v float64, err error){
v0, err := readUint64(buf)
if err != nil {
return
}
return *((*float64)((unsafe.Pointer)(&v0))), nil
}
func writeString(buf *bytes.Buffer, v string){
writeUint64(buf, (uint64)(len(v)))
buf.WriteString(v)
}
func readString(buf *bytes.Reader)(v string, err error){
l, err := readUint64(buf)
if err != nil {
return
}
bts := make([]byte, l)
if _, err = io.ReadFull(buf, bts); err != nil {
return
}
v = (string)(bts)
return
}
func writeReflectValue(value reflect.Value, buf *bytes.Buffer)(err error){
t := value.Type()
switch t.Kind() {
case reflect.Bool:
if value.Bool() {
buf.WriteByte(0x01)
}else{
buf.WriteByte(0x00)
}
return
case reflect.Int8:
v := value.Int()
buf.WriteByte((byte)(v))
return
case reflect.Int16, reflect.Int32:
v := value.Int()
writeUint32(buf, (uint32)(v))
return
case reflect.Int64, reflect.Int:
v := value.Int()
writeUint64(buf, (uint64)(v))
return
case reflect.Uint8:
v := value.Uint()
buf.WriteByte((byte)(v))
return
case reflect.Uint16, reflect.Uint32:
v := value.Uint()
writeUint32(buf, (uint32)(v))
return
case reflect.Uint64, reflect.Uint, reflect.Uintptr:
v := value.Uint()
writeUint64(buf, v)
return
case reflect.Float32:
v := value.Float()
writeFloat32(buf, (float32)(v))
return
case reflect.Float64:
v := value.Float()
writeFloat64(buf, v)
return
case reflect.Complex64:
v := (complex64)(value.Complex())
writeFloat32(buf, real(v))
writeFloat32(buf, imag(v))
return
case reflect.Complex128:
v := value.Complex()
writeFloat64(buf, real(v))
writeFloat64(buf, imag(v))
return
case reflect.String:
v := value.String()
writeString(buf, v)
return
case reflect.Pointer:
e := value.Elem()
if value.IsNil() {
buf.WriteByte(0x00)
return
}
buf.WriteByte(0x01)
return writeReflectValue(e, buf)
case reflect.Slice:
writeUint64(buf, (uint64)(value.Len()))
if t.Elem().Kind() == reflect.Uint8 {
buf.Write(value.Bytes())
return
}
fallthrough
case reflect.Array:
l := value.Len()
for i := 0; i < l; i++ {
if err = writeReflectValue(value.Index(i), buf); err != nil {
return
}
}
return
case reflect.Map:
l := value.Len()
writeUint64(buf, (uint64)(l))
r := value.MapRange()
i := 0
for r.Next() {
i++
if err = writeReflectValue(r.Key(), buf); err != nil {
return
}
if err = writeReflectValue(r.Value(), buf); err != nil {
return
}
}
if i != l {
panic("Map changed during serialize")
}
return
case reflect.Struct:
for i, l := 0, t.NumField(); i < l; i++ {
if !t.Field(i).IsExported() {
continue
}
if err = writeReflectValue(value.Field(i), buf); err != nil {
return
}
}
return
case reflect.Interface:
if t.NumMethod() == 0 {
var bts []byte
if bts, err = encodeValue(value.Interface()); err != nil {
return
}
writeUint64(buf, (uint64)(len(bts)))
buf.Write(bts)
return
}
return &UnsupportTypeErr{t}
default:
return &UnsupportTypeErr{t}
}
}
func readToReflectValue(value reflect.Value, buf *bytes.Reader)(err error){
t := value.Type()
switch t.Kind() {
case reflect.Bool:
var v byte
if v, err = buf.ReadByte(); err != nil {
return
}
value.SetBool(v != 0x00)
return
case reflect.Int8:
var v byte
if v, err = buf.ReadByte(); err != nil {
return
}
value.SetInt((int64)(v))
return
case reflect.Int16, reflect.Int32:
var v uint32
if v, err = readUint32(buf); err != nil {
return
}
value.SetInt((int64)(v))
return
case reflect.Int64, reflect.Int:
var v uint64
if v, err = readUint64(buf); err != nil {
return
}
value.SetInt((int64)(v))
return
case reflect.Uint8:
var v byte
if v, err = buf.ReadByte(); err != nil {
return
}
value.SetUint((uint64)(v))
return
case reflect.Uint16, reflect.Uint32:
var v uint32
if v, err = readUint32(buf); err != nil {
return
}
value.SetUint((uint64)(v))
return
case reflect.Uint64, reflect.Uint, reflect.Uintptr:
var v uint64
if v, err = readUint64(buf); err != nil {
return
}
value.SetUint(v)
return
case reflect.Float32:
var v float32
if v, err = readFloat32(buf); err != nil {
return
}
value.SetFloat((float64)(v))
return
case reflect.Float64:
var v float64
if v, err = readFloat64(buf); err != nil {
return
}
value.SetFloat(v)
return
case reflect.Complex64:
var rl, im float32
if rl, err = readFloat32(buf); err != nil {
return
}
if im, err = readFloat32(buf); err != nil {
return
}
value.SetComplex((complex128)(complex(rl, im)))
return
case reflect.Complex128:
var rl, im float64
if rl, err = readFloat64(buf); err != nil {
return
}
if im, err = readFloat64(buf); err != nil {
return
}
value.SetComplex(complex(rl, im))
return
case reflect.String:
var v string
if v, err = readString(buf); err != nil {
return
}
value.SetString(v)
return
case reflect.Pointer:
var b byte
if b, err = buf.ReadByte(); err != nil {
return
}
if b != 0x00 {
e := reflect.New(t.Elem())
value.Set(e)
return readToReflectValue(e.Elem(), buf)
}
return
case reflect.Slice:
var l uint64
if l, err = readUint64(buf); err != nil {
return
}
for i := 0; i < (int)(l); i++ {
if err = readToReflectValue(value.Index(i), buf); err != nil {
return
}
}
case reflect.Array:
l := value.Len()
for i := 0; i < l; i++ {
if err = readToReflectValue(value.Index(i), buf); err != nil {
return
}
}
return
case reflect.Map:
var l uint64
if l, err = readUint64(buf); err != nil {
return
}
value.Set(reflect.MakeMapWithSize(t, (int)(l)))
for i := 0; i < (int)(l); i++ {
k, v := reflect.New(t.Key()).Elem(), reflect.New(t.Elem()).Elem()
if err = readToReflectValue(k, buf); err != nil {
return
}
if err = readToReflectValue(v, buf); err != nil {
return
}
value.SetMapIndex(k, v)
}
return
case reflect.Struct:
for i, l := 0, t.NumField(); i < l; i++ {
if !t.Field(i).IsExported() {
continue
}
if err = readToReflectValue(value.Field(i), buf); err != nil {
return
}
}
return
case reflect.Interface:
if t.NumMethod() == 0 {
var l uint64
if l, err = readUint64(buf); err != nil {
return
}
bts := make([]byte, l)
if _, err = io.ReadFull(buf, bts); err != nil {
return
}
var v any
if v, err = decodeValue(bts); err != nil {
return
}
if v != nil {
value.Set(reflect.ValueOf(v))
}
return
}
return &UnsupportTypeErr{t}
default:
return &UnsupportTypeErr{t}
}
return
}
func encodeValue(value any)(bts []byte, err error){
if value == nil { // Zero length byte array represent the value is nil
return
}
rv := reflect.ValueOf(value)
rt := rv.Type()
tname, ok := getTypeRegisteredName(rt)
if !ok {
return nil, &UnsupportTypeErr{rt}
}
buf := bytes.NewBuffer(nil)
buf.WriteString(tname)
buf.WriteByte(':')
if err = reflectTypeToString(rt, buf); err != nil {
return
}
buf.WriteByte(0x00)
if err = writeReflectValue(rv, buf); err != nil {
return
}
bts = buf.Bytes()
return
}
func decodeValue(bts []byte)(value any, err error){
if len(bts) == 0 {
return
}
i := bytes.IndexByte(bts, 0x00)
if i == -1 {
return nil, ErrIncorrectFormat
}
typd, data := bts[:i], bts[i + 1:]
i = bytes.IndexByte(typd, ':')
if i == -1 {
return nil, ErrIncorrectFormat
}
tname, typd := (string)(typd[:i]), typd[i + 1:]
if len(typd) == 0 {
return nil, ErrIncorrectFormat
}
rt, ok := typeRegisterMap[tname]
if ok {
if typd[0] == '*' && rt.Kind() != reflect.Pointer {
rt = reflect.PointerTo(rt)
}
}else if rt, err = scanToReflectType(newTypeScanner(bytes.NewReader(typd))); err != nil {
return
}
rv := reflect.New(rt).Elem()
buf := bytes.NewReader(data)
if err = readToReflectValue(rv, buf); err != nil {
return
}
value = rv.Interface()
return
}
func WrapValue(value any)(v *Any, err error){
bts, err := encodeValue(value)
if err != nil {
return
}
return &Any{
Value: bts,
}, nil
}
func (v *Any)Unwrap()(value any, err error){
return decodeValue(v.Value)
}