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types.go
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types.go
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package codec
import (
"fmt"
"reflect"
"runtime"
"sync"
"unsafe"
)
const (
tNil byte = 0b0000_0000
tBool byte = 0b0001_0000
tByte byte = 0b0010_0000
tInt8 byte = 0b0010_0000
tInt16 byte = 0b0010_0001
tInt32 byte = 0b0010_0010
tInt64 byte = 0b0010_0011
tInt byte = 0b0011_0000
tFloat byte = 0b0100_0000
tComplex byte = 0b0101_0000
tPointer byte = 0b0110_0000
tString byte = 0b0111_0000
tList byte = 0b1000_0000
tMap byte = 0b1001_0000
tUintptr byte = 0b1010_0000
tRef byte = 0b1011_0000
tStruct byte = 0b1100_0000
tChan byte = 0b1101_0000
tFunc byte = 0b1101_1000
tType byte = 0b1110_0000
tInterface byte = 0b1111_0000
)
const (
version byte = 0b0000_0001 // 1 - version of the serializer
signed byte = 0b0000_1000 // for signed and unsigned integers
meta byte = 0b0000_0100 // for fixed size integers to determine whether the integer representation has meta information about its byte size
wide byte = 0b0000_1000 // == 1 for larger bit representations (for floats and complex numbers)
tru byte = 0b0000_0001 // for true booleans
fixed byte = 0b0000_1000 // for lists that are arrays (i.e. have fixed size)
raw byte = 0b0000_1000 // determines unsafe.Pointer for tUintptr
val byte = 0b0000_1000 // determines a reference that contains a value that some pointer points to
custom byte = 0b0000_1000 // determines whether the type implements custom serialization
mask byte = 0b1111_0000 // type mask
)
// Booleans
// ---------------------------------------------------------------------------------------------------------------------
// true: tBool|tru
// false: tBool
// Strings
// ---------------------------------------------------------------------------------------------------------------------
// tString|(length's size in bytes - 1) + length bytes + string bytes
// Fixed size integers
// ---------------------------------------------------------------------------------------------------------------------
// int8:
// tInt8|signed + byte
// uint8:
// tInt8 + byte
// int16
// tInt16|signed|meta + byte (if -128 <= number <= 127)
// tInt16|signed + byte + byte (if number > 127 or number < -128)
// uint16:
// tInt16|meta + byte (if number <= 255)
// tInt16 + byte + byte (if number > 255)
// int32:
// tInt32|signed|meta + 0b01 + null bits + number bits (if min number bits <= 6)
// tInt32|signed|meta + 0b10 + null bits + number bits (if 6 < min number bits <= 14)
// tInt32|signed|meta + 0b11 + null bits + number bits (if 14 < min number bits <= 22)
// tInt32|signed + number bytes (if 22 < min number bits <= 32)
// uint32:
// tInt32|meta + 0b01 + null bits + number bits (if min number bits <= 6)
// tInt32|meta + 0b10 + null bits + number bits (if 6 < min number bits <= 14)
// tInt32|meta + 0b11 + null bits + number bits (if 14 < min number bits <= 22)
// tInt32 + number bytes (if 22 < min number bits <= 32)
// int64:
// tInt64|signed|meta + 0b001 + null bits + number bits (if min number bits <= 5)
// tInt64|signed|meta + 0b010 + null bits + number bits (if 5 < min number bits <= 13)
// tInt64|signed|meta + 0b011 + null bits + number bits (if 13 < min number bits <= 21)
// tInt64|signed|meta + 0b100 + null bits + number bits (if 21 < min number bits <= 29)
// tInt64|signed|meta + 0b101 + null bits + number bits (if 29 < min number bits <= 37)
// tInt64|signed|meta + 0b110 + null bits + number bits (if 37 < min number bits <= 45)
// tInt64|signed|meta + 0b110 + null bits + number bits (if 45 < min number bits <= 53)
// tInt64|signed + number bytes (if 53 < min number bits <= 64)
// uint64:
// tInt64|meta + 0b001 + null bits + number bits (if min number bits <= 5)
// tInt64|meta + 0b010 + null bits + number bits (if 5 < min number bits <= 13)
// tInt64|meta + 0b011 + null bits + number bits (if 13 < min number bits <= 21)
// tInt64|meta + 0b100 + null bits + number bits (if 21 < min number bits <= 29)
// tInt64|meta + 0b101 + null bits + number bits (if 29 < min number bits <= 37)
// tInt64|meta + 0b110 + null bits + number bits (if 37 < min number bits <= 45)
// tInt64|meta + 0b110 + null bits + number bits (if 45 < min number bits <= 53)
// tInt64 + number bytes (if 53 < min number bits <= 64)
// Platform dependent integers
// ---------------------------------------------------------------------------------------------------------------------
// int
// tInt|signed|(number's byte count - 1) + number bytes
// uint
// tInt|(number's byte count - 1) + number bytes
// uintptr
// tUintptr|(pointer's byte count - 1) + pointer bytes
// unsafe.Pointer
// tUintptr|raw|(pointer's byte count - 1) + pointer bytes
// Floating point numbers
// ---------------------------------------------------------------------------------------------------------------------
// float32:
// tFloat|(number's byte count - 1) + number bytes
// float64:
// tFloat|wide|(number's byte count - 1) + number bytes
// complex64:
// tComplex + encoded real part + encoded imaginary part
// complex128:
// tComplex|wide + encoded real part + encoded imaginary part
// Lists and maps
// ---------------------------------------------------------------------------------------------------------------------
// slices
// tType + type id + tList|(length's size in bytes - 1) + encoded elements
// arrays
// tType + type id + tList|fixed|(length's size in bytes - 1) + encoded elements
// maps
// tType + type id + tMap|(length's size in bytes - 1) + encoded key/value pairs
// Structs
// ---------------------------------------------------------------------------------------------------------------------
// tType + type id + tStruct|(size of number of fields in bytes - 1) + encoded fields
// Channels
// ---------------------------------------------------------------------------------------------------------------------
// tType + type id + tChan|reflect.ChanDir + encoded (as uint) channel capacity
// Functions
// ---------------------------------------------------------------------------------------------------------------------
// tType + func id + tFunc
// Any serializable objects
// ---------------------------------------------------------------------------------------------------------------------
// tType|custom + type id + underlying base type (tBool, tInt, etc)|(size of custom encoding's length in bytes - 1)
// + custom encoding
const numOfKnownTypes = 19
var serializableInterfaceType = reflect.TypeOf((*Serializable)(nil)).Elem()
func isSerializable(v reflect.Value) bool {
if v.IsValid() {
t := v.Type()
if isSimplePointer(t) {
return false
}
return t.Implements(serializableInterfaceType)
}
return false
}
func isSimplePointer(t reflect.Type) bool {
return t.Kind() == reflect.Pointer && isCommonType(t)
}
func isCommonType(t reflect.Type) bool {
name := t.Name()
if name == "" {
return true
}
if name == t.Kind().String() {
return true
}
if t.Kind() == reflect.UnsafePointer && name == "Pointer" {
return true
}
return false
}
func funcName(f reflect.Value) string {
if f.Kind() != reflect.Func {
return ""
}
return runtime.FuncForPC(f.Pointer()).Name()
}
func changeValue(value reflect.Value, newValue any) {
value.Set(reflect.ValueOf(newValue).Convert(value.Type()))
}
type typeChecker struct {
initiated bool
typeAutoReg bool
types map[string]reflect.Type // registered types
funcs map[string]reflect.Value // registered functions
typeSignatures map[int][]byte // type signatures
typeNames map[string]int // type full names
tmx sync.RWMutex
nmx sync.RWMutex
}
var tChecker = &typeChecker{
typeAutoReg: true,
types: make(map[string]reflect.Type, numOfKnownTypes),
funcs: make(map[string]reflect.Value),
typeSignatures: make(map[int][]byte, numOfKnownTypes),
typeNames: make(map[string]int),
}
func (ch *typeChecker) init() {
if ch.initiated {
return
}
ch.initiated = true
types := []reflect.Type{
reflect.TypeOf([]any{}).Elem(), // interface {}
reflect.TypeOf(false),
reflect.TypeOf(""),
reflect.TypeOf(int8(0)),
reflect.TypeOf(uint8(0)),
reflect.TypeOf(int16(0)),
reflect.TypeOf(uint16(0)),
reflect.TypeOf(int32(0)),
reflect.TypeOf(uint32(0)),
reflect.TypeOf(int64(0)),
reflect.TypeOf(uint64(0)),
reflect.TypeOf(0),
reflect.TypeOf(uint(0)),
reflect.TypeOf(float32(0)),
reflect.TypeOf(float64(0)),
reflect.TypeOf(complex64(0)),
reflect.TypeOf(complex128(0)),
reflect.TypeOf(uintptr(0)),
reflect.TypeOf(unsafe.Pointer(uintptr(0))),
}
for _, t := range types {
ch.registerType(t)
}
}
func (ch *typeChecker) registerTypeOf(v any) []byte {
t := reflect.TypeOf(v)
if t.Kind() == reflect.Func {
return ch.registerFunc(reflect.ValueOf(v))
}
return ch.registerType(reflect.TypeOf(v))
}
func (ch *typeChecker) registerType(t reflect.Type) []byte {
if isSimplePointer(t) {
return []byte{tPointer}
}
ch.tmx.Lock()
s, id := ch.formTypeSignature(t)
ch.types[string(s)] = t
ch.typeSignatures[id] = s
ch.tmx.Unlock()
return append([]byte{}, s...)
}
func (ch *typeChecker) registerFunc(f reflect.Value) []byte {
ch.tmx.Lock()
s, id := ch.formFuncSignature(f)
ch.funcs[string(s)] = f
ch.typeSignatures[id] = s
ch.tmx.Unlock()
return append([]byte{}, s...)
}
func (ch *typeChecker) typeSignatureOf(v reflect.Value) []byte {
if v.IsValid() {
if v.Kind() == reflect.Func {
return ch.funcSignature(v)
}
return ch.typeSignature(v.Type())
}
return []byte{tNil}
}
func (ch *typeChecker) typeSignature(t reflect.Type) []byte {
if t == nil {
return []byte{tNil}
}
if isSimplePointer(t) {
return []byte{tPointer}
}
ch.tmx.RLock()
id := ch.typeId(t)
signature, exists := ch.typeSignatures[id]
if exists {
ch.tmx.RUnlock()
return append([]byte{}, signature...)
}
ch.tmx.RUnlock()
if ch.typeAutoReg {
return ch.registerType(t)
}
panic(fmt.Sprintf("unregistered type: %s", ch.fullTypeName(t)))
}
func (ch *typeChecker) funcSignature(f reflect.Value) []byte {
ch.tmx.RLock()
id := ch.funcId(f)
signature, exists := ch.typeSignatures[id]
if exists {
ch.tmx.RUnlock()
return append([]byte{}, signature...)
}
id = ch.typeId(f.Type())
signature, exists = ch.typeSignatures[id]
if exists {
ch.tmx.RUnlock()
return append([]byte{}, signature...)
}
ch.tmx.RUnlock()
if ch.typeAutoReg {
return ch.registerFunc(f)
}
panic(fmt.Sprintf("unregistered function: %s", funcName(f)))
}
func (ch *typeChecker) formTypeSignature(t reflect.Type) ([]byte, int) {
if t == nil {
return []byte{tNil}, -1
}
var ut byte
switch t.Kind() {
case reflect.Invalid:
ut = tNil
case reflect.Bool:
ut = tBool
case reflect.Uint8:
ut = tInt8
case reflect.Int8:
ut = tInt8 | signed
case reflect.Uint16:
ut = tInt16
case reflect.Int16:
ut = tInt16 | signed
case reflect.Uint32:
ut = tInt32
case reflect.Int32:
ut = tInt32 | signed
case reflect.Uint64:
ut = tInt64
case reflect.Int64:
ut = tInt64 | signed
case reflect.Uint:
ut = tInt
case reflect.Int:
ut = tInt | signed
case reflect.String:
ut = tString
case reflect.Float32:
ut = tFloat
case reflect.Float64:
ut = tFloat | wide
case reflect.Complex64:
ut = tComplex
case reflect.Complex128:
ut = tComplex | wide
case reflect.Uintptr:
ut = tUintptr
case reflect.UnsafePointer:
ut = tUintptr | raw
case reflect.Interface:
ut = tInterface
case reflect.Pointer:
ut = tPointer
goto encodeTypeName
case reflect.Slice:
ut = tList
goto encodeTypeName
case reflect.Array:
ut = tList | fixed
goto encodeTypeName
case reflect.Map:
ut = tMap
goto encodeTypeName
case reflect.Struct:
ut = tStruct
goto encodeTypeName
case reflect.Chan:
ut = tChan | byte(t.ChanDir())
goto encodeTypeName
case reflect.Func:
ut = tFunc
goto encodeTypeName
default:
panic(fmt.Sprintf("unsupported type kind %q", t.Kind()))
}
if isCommonType(t) {
id := ch.typeId(t)
return []byte{ut}, id
}
encodeTypeName:
return ch.encodedTypeName(t, ut)
}
func (ch *typeChecker) formFuncSignature(f reflect.Value) ([]byte, int) {
return ch.encodedTypeId(ch.funcId(f), tFunc)
}
func (ch *typeChecker) encodedTypeName(t reflect.Type, underlyingType byte) ([]byte, int) {
return ch.encodedTypeId(ch.typeId(t), underlyingType)
}
func (ch *typeChecker) encodedTypeId(id int, underlyingType byte) ([]byte, int) {
byteSize, idBytes := toMinBytes(uint64(id))
b := make([]byte, 1, byteSize+2)
b[0] = tType | byte(byteSize-1)
return append(append(b, idBytes...), underlyingType), id
}
func (ch *typeChecker) typeId(t reflect.Type) int {
return ch.nameToId(ch.fullTypeName(t))
}
func (ch *typeChecker) funcId(f reflect.Value) int {
return ch.nameToId(funcName(f))
}
func (ch *typeChecker) nameToId(name string) int {
ch.nmx.RLock()
id, exists := ch.typeNames[name]
ch.nmx.RUnlock()
if exists {
return id
}
ch.nmx.Lock()
id, exists = ch.typeNames[name]
if !exists {
id = len(ch.typeNames)
ch.typeNames[name] = id
}
ch.nmx.Unlock()
return id
}
func (ch *typeChecker) fullTypeName(t reflect.Type) string {
if t == nil {
return "<nil>"
}
if t.Name() != "" {
name := t.Name()
if t.PkgPath() != "" {
name = t.PkgPath() + "." + name
}
return name
}
switch t.Kind() {
case reflect.Invalid:
return "<nil>"
case reflect.Pointer:
return "*" + ch.fullTypeName(t.Elem())
case reflect.Slice:
return "[]" + ch.fullTypeName(t.Elem())
case reflect.Array:
return fmt.Sprintf("[%d]%s", t.Len(), ch.fullTypeName(t.Elem()))
case reflect.Map:
return fmt.Sprintf("map[%s]%s", ch.fullTypeName(t.Key()), ch.fullTypeName(t.Elem()))
case reflect.Struct:
f := ""
for i, numFields := 0, t.NumField(); i < numFields; i++ {
field := t.Field(i)
if i > 0 {
f += "; "
}
f += fmt.Sprintf("%s %s", field.Name, ch.fullTypeName(t.Field(i).Type))
}
return fmt.Sprintf("struct { %s }", f)
case reflect.Chan:
switch t.ChanDir() {
case reflect.BothDir:
return "chan " + ch.fullTypeName(t.Elem())
case reflect.RecvDir:
return "<-chan" + ch.fullTypeName(t.Elem())
default:
return "chan<-" + ch.fullTypeName(t.Elem())
}
}
return t.String()
}
func (ch *typeChecker) valueOf(typeSignature []byte) (reflect.Value, error) {
if typeSignature[len(typeSignature)-1] == tFunc {
f, err := ch.funcOf(typeSignature)
if err != nil {
return reflect.Value{}, err
}
return f, nil
}
t, err := ch.typeOf(typeSignature)
if err != nil {
return reflect.Value{}, err
}
return reflect.New(t).Elem(), nil
}
func (ch *typeChecker) typeOf(typeSignature []byte) (reflect.Type, error) {
ch.tmx.RLock()
t, exists := ch.types[*(*string)(unsafe.Pointer(&typeSignature))]
ch.tmx.RUnlock()
if !exists {
return nil, fmt.Errorf("unrecognized type with signature: %v", typeSignature)
}
return t, nil
}
func (ch *typeChecker) funcOf(typeSignature []byte) (reflect.Value, error) {
ch.tmx.RLock()
f, exists := ch.funcs[*(*string)(unsafe.Pointer(&typeSignature))]
ch.tmx.RUnlock()
if !exists {
return reflect.Value{}, fmt.Errorf("unrecognized function with signature: %v", typeSignature)
}
return f, nil
}
func RegisterType(t reflect.Type) {
tChecker.registerType(t)
}
func RegisterTypeOf(value any) {
tChecker.registerTypeOf(value)
}
func TurnOffTypeAutoRegistration() {
tChecker.typeAutoReg = false
}
func TurnOnTypeAutoRegistration() {
tChecker.typeAutoReg = true
}
func id(v any) byte {
t := reflect.TypeOf(v)
if t.Kind() == reflect.Func {
return byte(tChecker.funcId(reflect.ValueOf(v)))
}
return byte(tChecker.typeId(t))
}
func init() {
tChecker.init()
}
func GetRegisteredTypeNames() []string {
var typeNames []string
for typeName := range tChecker.typeNames {
typeNames = append(typeNames, typeName)
}
return typeNames
}