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abiencoder.go
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abiencoder.go
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package eos
import (
"bytes"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"strconv"
"strings"
"time"
"github.com/eoscanada/eos-go/ecc"
"github.com/tidwall/gjson"
)
type ABIEncoder struct {
abiReader io.Reader
eosEncoder *Encoder
abi *ABI
pos int
}
func (a *ABI) EncodeAction(actionName ActionName, json []byte) ([]byte, error) {
action := a.ActionForName(actionName)
if action == nil {
return nil, fmt.Errorf("encode action: action %s not found in abi", actionName)
}
var buffer bytes.Buffer
encoder := NewEncoder(&buffer)
err := a.encode(encoder, action.Type, json)
if err != nil {
return nil, fmt.Errorf("encode action: %s", err)
}
return buffer.Bytes(), nil
}
func (a *ABI) encode(binaryEncoder *Encoder, structureName string, json []byte) error {
Logger.ABIEncoder.Printf("Encoding structure [%s]\n", structureName)
structure := a.StructForName(structureName)
if structure == nil {
return fmt.Errorf("encode: structure [%s] not found in abi", structureName)
}
if structure.Base != "" {
Logger.ABIEncoder.Printf("Structure [%s] has base structure of type [%s]\n", structureName, structure.Base)
err := a.encode(binaryEncoder, structure.Base, json)
if err != nil {
return fmt.Errorf("encode base [%s]: %s", structureName, err)
}
}
err := a.encodeFields(binaryEncoder, structure.Fields, json)
return err
}
func (a *ABI) encodeFields(binaryEncoder *Encoder, fields []FieldDef, json []byte) error {
defer Logger.ABIEncoder.SetPrefix(Logger.ABIEncoder.Prefix())
defer Logger.Encoder.SetPrefix(Logger.Encoder.Prefix())
Logger.ABIEncoder.SetPrefix(Logger.ABIEncoder.Prefix() + "\t")
Logger.Encoder.SetPrefix(Logger.Encoder.Prefix() + "\t")
for _, field := range fields {
Logger.ABIEncoder.Printf("Encoding field [%s] of type [%s]\n", field.Name, field.Type)
fieldType, isOptional, isArray := analyzeFieldType(field.Type)
typeName := a.TypeNameForNewTypeName(fieldType)
fieldName := field.Name
if typeName != field.Type {
Logger.ABIEncoder.Printf("[%s] is an alias of [%s]\n", field.Type, typeName)
}
err := a.encodeField(binaryEncoder, fieldName, typeName, isOptional, isArray, json)
if err != nil {
return fmt.Errorf("encoding fields: %s", err)
}
}
return nil
}
func (a *ABI) encodeField(binaryEncoder *Encoder, fieldName string, fieldType string, isOptional bool, isArray bool, json []byte) (err error) {
Logger.ABIEncoder.Println("encodeField: json:", string(json))
value := gjson.GetBytes(json, fieldName)
if isOptional {
if value.Exists() {
Logger.ABIEncoder.Printf("Field [%s] of type [%s] is optional and present\n", fieldName, fieldType)
if e := binaryEncoder.writeByte(1); e != nil {
return e
}
} else {
Logger.ABIEncoder.Printf("Field [%s] of type [%s] is optional and not present\n", fieldName, fieldType)
return binaryEncoder.writeByte(0)
}
} else if !value.Exists() {
return fmt.Errorf("encode field: none optional field [%s] as a nil value", fieldName)
}
if isArray {
Logger.ABIEncoder.Printf("Field [%s] of type [%s] is an array\n", fieldName, fieldType)
if !value.IsArray() {
return fmt.Errorf("encode field: expected array for field [%s] got [%s]", fieldName, value.Type.String())
}
results := value.Array()
binaryEncoder.writeUVarInt(len(results))
for _, r := range results {
a.writeField(binaryEncoder, fieldName, fieldType, r)
}
return nil
}
return a.writeField(binaryEncoder, fieldName, fieldType, value)
}
func (a *ABI) writeField(binaryEncoder *Encoder, fieldName string, fieldType string, value gjson.Result) error {
Logger.ABIEncoder.Printf("Writing value [%s] for field [%s] of type [%s]\n", value.Raw, fieldName, fieldType)
structure := a.StructForName(fieldType)
if structure != nil {
Logger.ABIEncoder.Printf("Field [%s] is a structure\n", fieldName)
err := a.encodeFields(binaryEncoder, structure.Fields, []byte(value.Raw))
if err != nil {
return err
}
return nil
}
var object interface{}
switch fieldType {
case "int8":
i, err := valueToInt(fieldName, value, 8)
if err != nil {
return err
}
object = int8(i)
case "uint8":
i, err := valueToUint(fieldName, value, 8)
if err != nil {
return err
}
object = uint8(i)
case "int16":
i, err := valueToInt(fieldName, value, 16)
if err != nil {
return err
}
object = int16(i)
case "uint16":
i, err := valueToUint(fieldName, value, 16)
if err != nil {
return err
}
object = uint16(i)
case "int32", "varint32":
i, err := valueToInt(fieldName, value, 32)
if err != nil {
return err
}
object = int32(i)
case "uint32", "varuint32":
i, err := valueToUint(fieldName, value, 32)
if err != nil {
return err
}
object = uint32(i)
case "int64":
var in Int64
if err := json.Unmarshal([]byte(value.Raw), &in); err != nil {
return fmt.Errorf("encoding int64: %s", err)
}
object = in
case "uint64":
var in Uint64
if err := json.Unmarshal([]byte(value.Raw), &in); err != nil {
return fmt.Errorf("encoding uint64: %s", err)
}
object = in
case "int128":
var in Int128
if err := json.Unmarshal([]byte(value.Raw), &in); err != nil {
return err
}
object = in
case "uint128":
var in Uint128
if err := json.Unmarshal([]byte(value.Raw), &in); err != nil {
return err
}
object = in
case "float32":
f, err := valueToFloat(fieldName, value, 32)
if err != nil {
return err
}
object = float32(f)
case "float64":
f, err := valueToFloat(fieldName, value, 64)
if err != nil {
return err
}
object = f
case "float128":
var in Float128
if err := json.Unmarshal([]byte(value.Raw), &in); err != nil {
return err
}
object = in
case "bool":
object = value.Bool()
case "time_point_sec":
t, err := time.Parse("2006-01-02T15:04:05", value.Str)
if err != nil {
return fmt.Errorf("writing field: time_point_sec: %s", err)
}
object = TimePointSec(t.UTC().Second())
case "time_point":
t, err := time.Parse("2006-01-02T15:04:05.999", value.Str)
if err != nil {
return fmt.Errorf("writing field: time_point: %s", err)
}
object = TimePoint(t.UTC().Nanosecond() / int(time.Millisecond))
case "block_timestamp_type":
t, err := time.Parse("2006-01-02T15:04:05.999999-07:00", value.Str)
if err != nil {
return fmt.Errorf("writing field: block_timestamp_type: %s", err)
}
object = BlockTimestamp{
Time: t,
}
case "name":
if len(value.Str) > 12 {
return fmt.Errorf("writing field: name: %s is to long. expexted length of max 12 characters", value.Str)
}
object = Name(value.Str)
case "bytes":
data, err := hex.DecodeString(value.String())
if err != nil {
return fmt.Errorf("writing field: bytes: %s", err)
}
object = data
case "string":
object = value.String()
case "checksum160":
if len(value.Str) != 40 {
return fmt.Errorf("writing field: checksum160: expected length of 40 got %d for value %s", len(value.Str), value.String())
}
data, err := hex.DecodeString(value.Str)
if err != nil {
return fmt.Errorf("writing field: checksum160: %s", err)
}
object = Checksum160(data)
case "checksum256":
if len(value.Str) != 64 {
return fmt.Errorf("writing field: checksum256: expected length of 64 got %d for value %s", len(value.Str), value.String())
}
data, err := hex.DecodeString(value.Str)
if err != nil {
return fmt.Errorf("writing field: checksum256: %s", err)
}
object = Checksum256(data)
case "checksum512":
if len(value.Str) != 128 {
return fmt.Errorf("writing field: checksum512: expected length of 128 got %d for value %s", len(value.Str), value.String())
}
data, err := hex.DecodeString(value.String())
if err != nil {
return fmt.Errorf("writing field: checksum512: %s", err)
}
object = Checksum512(data)
case "public_key":
pk, err := ecc.NewPublicKey(value.String())
if err != nil {
return fmt.Errorf("writing field: public_key: %s", err)
}
object = pk
case "signature":
signature, err := ecc.NewSignature(value.String())
if err != nil {
return fmt.Errorf("writing field: public_key: %s", err)
}
object = signature
case "symbol":
parts := strings.Split(value.Str, ",")
if len(parts) != 2 {
return fmt.Errorf("writing field: symbol: symbol should be of format '4,EOS'")
}
i, err := strconv.ParseUint(parts[0], 10, 8)
if err != nil {
return fmt.Errorf("writing field: symbol: %s", err)
}
object = Symbol{
Precision: uint8(i),
Symbol: parts[1],
}
case "symbol_code":
object = SymbolCode(value.Uint())
case "asset":
asset, err := NewAsset(value.String())
if err != nil {
return fmt.Errorf("writing field: asset: %s", err)
}
object = asset
case "extended_asset":
var extendedAsset ExtendedAsset
err := json.Unmarshal([]byte(value.Raw), &extendedAsset)
if err != nil {
return fmt.Errorf("writing field: extended_asset: %s", err)
}
object = extendedAsset
default:
return fmt.Errorf("writing field of type [%s]: unknown type", fieldType)
}
Logger.ABIEncoder.Printf("Writing object [%s]\n", object)
return binaryEncoder.Encode(object)
}
func valueToInt(fieldName string, value gjson.Result, bitSize int) (int64, error) {
i, err := strconv.ParseInt(value.Raw, 10, bitSize)
if err != nil {
return i, fmt.Errorf("writing field: [%s] type int%d : %s", fieldName, bitSize, err)
}
return i, nil
}
func valueToUint(fieldName string, value gjson.Result, bitSize int) (uint64, error) {
i, err := strconv.ParseUint(value.Raw, 10, bitSize)
if err != nil {
return i, fmt.Errorf("writing field: [%s] type uint%d : %s", fieldName, bitSize, err)
}
return i, nil
}
func valueToFloat(fieldName string, value gjson.Result, bitSize int) (float64, error) {
f, err := strconv.ParseFloat(value.Raw, bitSize)
if err != nil {
return f, fmt.Errorf("writing field: [%s] type float%d : %s", fieldName, bitSize, err)
}
return f, nil
}