forked from eoscanada/eos-go
/
encoder.go
350 lines (301 loc) · 7.74 KB
/
encoder.go
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package eos
import (
"bytes"
"encoding/binary"
"encoding/hex"
"errors"
"fmt"
"io"
"reflect"
"github.com/eoscanada/eos-go/ecc"
)
// --------------------------------------------------------------
// Encoder implements the EOS packing, similar to FC_BUFFER
// --------------------------------------------------------------
type Encoder struct {
output io.Writer
Order binary.ByteOrder
count int
}
func NewEncoder(w io.Writer) *Encoder {
return &Encoder{
output: w,
Order: binary.LittleEndian,
count: 0,
}
}
func (e *Encoder) writeName(name Name) (err error) {
val, er := StringToName(string(name))
if er != nil {
err = fmt.Errorf("encode, name, %s", er)
return
}
err = e.writeUint64(val)
return
}
func (e *Encoder) Encode(v interface{}) (err error) {
switch cv := v.(type) {
case Name:
return e.writeName(cv)
case AccountName:
name := Name(cv)
return e.writeName(name)
case PermissionName:
name := Name(cv)
return e.writeName(name)
case ActionName:
name := Name(cv)
return e.writeName(name)
case TableName:
name := Name(cv)
return e.writeName(name)
case ScopeName:
name := Name(cv)
return e.writeName(name)
case string:
return e.writeString(cv)
case byte:
return e.writeByte(cv)
case int8:
return e.writeByte(byte(cv))
case int16:
return e.writeInt16(cv)
case uint16:
return e.writeUint16(cv)
case uint32:
return e.writeUint32(cv)
case uint64:
return e.writeUint64(cv)
case Varuint32:
return e.writeUVarInt(int(cv))
case bool:
return e.writeBool(cv)
case JSONTime:
return e.writeJSONTime(cv)
case HexBytes:
return e.writeByteArray(cv)
case []byte:
return e.writeByteArray(cv)
case SHA256Bytes:
return e.writeSHA256Bytes(cv)
case ecc.PublicKey:
return e.writePublicKey(cv)
case ecc.Signature:
return e.writeSignature(cv)
case Tstamp:
return e.writeTstamp(cv)
case BlockTimestamp:
return e.writeBlockTimestamp(cv)
case CurrencyName:
return e.writeCurrencyName(cv)
case Asset:
return e.writeAsset(cv)
case ActionData:
return e.writeActionData(cv)
case *P2PMessageEnvelope:
return e.writeBlockP2PMessageEnvelope(*cv)
default:
rv := reflect.Indirect(reflect.ValueOf(v))
t := rv.Type()
switch t.Kind() {
case reflect.Array:
l := t.Len()
prefix = append(prefix, " ")
println(fmt.Sprintf("Encode: array [%T] of length: %d", v, l))
for i := 0; i < l; i++ {
if err = e.Encode(rv.Index(i).Interface()); err != nil {
return
}
}
prefix = prefix[:len(prefix)-1]
case reflect.Slice:
l := rv.Len()
if err = e.writeUVarInt(l); err != nil {
return
}
prefix = append(prefix, " ")
println(fmt.Sprintf("Encode: slice [%T] of length: %d", v, l))
for i := 0; i < l; i++ {
if err = e.Encode(rv.Index(i).Interface()); err != nil {
return
}
}
prefix = prefix[:len(prefix)-1]
case reflect.Struct:
l := rv.NumField()
println(fmt.Sprintf("Encode: struct [%T] with %d field.", v, l))
prefix = append(prefix, " ")
n := 0
for i := 0; i < l; i++ {
field := t.Field(i)
println(fmt.Sprintf("field -> %s", field.Name))
if tag := field.Tag.Get("eos"); tag == "-" {
continue
}
if v := rv.Field(i); t.Field(i).Name != "_" {
if v.CanInterface() {
iface := v.Interface()
if iface != nil {
if err = e.Encode(iface); err != nil {
return
}
}
}
n++
}
}
prefix = prefix[:len(prefix)-1]
case reflect.Map:
l := rv.Len()
if err = e.writeUVarInt(l); err != nil {
return
}
println(fmt.Sprintf("Map [%T] of length: %d", v, l))
for _, key := range rv.MapKeys() {
value := rv.MapIndex(key)
if err = e.Encode(key.Interface()); err != nil {
return err
}
if err = e.Encode(value.Interface()); err != nil {
return err
}
}
default:
return errors.New("binary: unsupported type " + t.String())
}
}
return
}
func (e *Encoder) toWriter(bytes []byte) (err error) {
e.count += len(bytes)
println(fmt.Sprintf(" Appending : [%s] pos [%d]", hex.EncodeToString(bytes), e.count))
_, err = e.output.Write(bytes)
return
}
func (e *Encoder) writeByteArray(b []byte) error {
if err := e.writeUVarInt(len(b)); err != nil {
return err
}
return e.toWriter(b)
}
func (e *Encoder) writeUVarInt(v int) (err error) {
buf := make([]byte, 8)
l := binary.PutUvarint(buf, uint64(v))
return e.toWriter(buf[:l])
}
func (e *Encoder) writeByte(b byte) (err error) {
return e.toWriter([]byte{b})
}
func (e *Encoder) writeBool(b bool) (err error) {
var out byte
if b {
out = 1
}
return e.writeByte(out)
}
func (e *Encoder) writeUint16(i uint16) (err error) {
buf := make([]byte, TypeSize.UInt16)
binary.LittleEndian.PutUint16(buf, i)
return e.toWriter(buf)
}
func (e *Encoder) writeInt16(i int16) (err error) {
return e.writeUint16(uint16(i))
}
func (e *Encoder) writeUint32(i uint32) (err error) {
buf := make([]byte, TypeSize.UInt32)
binary.LittleEndian.PutUint32(buf, i)
return e.toWriter(buf)
}
func (e *Encoder) writeUint64(i uint64) (err error) {
buf := make([]byte, TypeSize.UInt64)
binary.LittleEndian.PutUint64(buf, i)
return e.toWriter(buf)
}
func (e *Encoder) writeString(s string) (err error) {
return e.writeByteArray([]byte(s))
}
func (e *Encoder) writeSHA256Bytes(s SHA256Bytes) error {
if len(s) == 0 {
return e.toWriter(bytes.Repeat([]byte{0}, TypeSize.SHA256Bytes))
}
return e.toWriter(s)
}
func (e *Encoder) writePublicKey(pk ecc.PublicKey) (err error) {
if len(pk) == 0 {
return e.toWriter(bytes.Repeat([]byte{0}, TypeSize.PublicKey))
}
return e.toWriter(append(bytes.Repeat([]byte{0}, 34-len(pk)), pk...))
}
func (e *Encoder) writeSignature(s ecc.Signature) (err error) {
if len(s) == 0 {
return e.toWriter(bytes.Repeat([]byte{0}, TypeSize.Signature))
}
return e.toWriter(s)
}
func (e *Encoder) writeTstamp(t Tstamp) (err error) {
n := uint64(t.UnixNano())
return e.writeUint64(n)
}
func (e *Encoder) writeBlockTimestamp(bt BlockTimestamp) (err error) {
n := uint32(bt.Unix() - 946684800)
return e.writeUint32(n)
}
func (e *Encoder) writeCurrencyName(curreny CurrencyName) (err error) {
out := make([]byte, 7, 7)
copy(out, []byte(curreny))
return e.toWriter(out)
}
func (e *Encoder) writeAsset(asset Asset) (err error) {
e.writeUint64(uint64(asset.Amount))
e.writeByte(asset.Precision)
symbol := make([]byte, 7, 7)
copy(symbol[:], []byte(asset.Symbol.Symbol))
return e.toWriter(symbol)
}
func (e *Encoder) writeJSONTime(time JSONTime) (err error) {
return e.writeUint32(uint32(time.Unix()))
}
func (e *Encoder) writeBlockP2PMessageEnvelope(envelope P2PMessageEnvelope) (err error) {
println("writeBlockP2PMessageEnvelope")
if envelope.P2PMessage != nil {
buf := new(bytes.Buffer)
subEncoder := NewEncoder(buf)
err = subEncoder.Encode(envelope.P2PMessage)
if err != nil {
err = fmt.Errorf("p2p message, %s", err)
return
}
envelope.Payload = buf.Bytes()
}
messageLen := uint32(len(envelope.Payload) + 1)
println(fmt.Sprintf("Message length: %d", messageLen))
err = e.writeUint32(messageLen)
if err == nil {
err = e.writeByte(byte(envelope.Type))
if err == nil {
return e.toWriter(envelope.Payload)
}
}
return
}
func (e *Encoder) writeActionData(actionData ActionData) (err error) {
if actionData.Data != nil {
//if reflect.TypeOf(actionData.Data) == reflect.TypeOf(&ActionData{}) {
// log.Fatal("pas cool")
//}
println(fmt.Sprintf("encoding action data, %T", actionData.Data))
raw, err := MarshalBinary(actionData.Data)
if err != nil {
return err
}
println(fmt.Sprintf("writing action data, %T", actionData.Data))
return e.writeByteArray(raw)
}
return e.writeByteArray([]byte{})
}
func MarshalBinary(v interface{}) ([]byte, error) {
buf := new(bytes.Buffer)
encoder := NewEncoder(buf)
err := encoder.Encode(v)
return buf.Bytes(), err
}