neo-go/pkg/rpc/stack_param.go

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package rpc
import (
"encoding/binary"
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"encoding/hex"
"encoding/json"
"strconv"
"github.com/CityOfZion/neo-go/pkg/util"
"github.com/pkg/errors"
)
// StackParamType represents different types of stack values.
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type StackParamType int
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// All possible StackParamType values are listed here.
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const (
Unknown StackParamType = -1
Signature StackParamType = 0x00
Boolean StackParamType = 0x01
Integer StackParamType = 0x02
Hash160 StackParamType = 0x03
Hash256 StackParamType = 0x04
ByteArray StackParamType = 0x05
PublicKey StackParamType = 0x06
String StackParamType = 0x07
Array StackParamType = 0x10
InteropInterface StackParamType = 0xf0
Void StackParamType = 0xff
)
// String implements the stringer interface.
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func (t StackParamType) String() string {
switch t {
case Signature:
return "Signature"
case Boolean:
return "Boolean"
case Integer:
return "Integer"
case Hash160:
return "Hash160"
case Hash256:
return "Hash256"
case ByteArray:
return "ByteArray"
case PublicKey:
return "PublicKey"
case String:
return "String"
case Array:
return "Array"
case InteropInterface:
return "InteropInterface"
case Void:
return "Void"
default:
return "Unknown"
}
}
// StackParamTypeFromString converts string into the StackParamType.
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func StackParamTypeFromString(s string) (StackParamType, error) {
switch s {
case "Signature":
return Signature, nil
case "Boolean":
return Boolean, nil
case "Integer":
return Integer, nil
case "Hash160":
return Hash160, nil
case "Hash256":
return Hash256, nil
case "ByteArray":
return ByteArray, nil
case "PublicKey":
return PublicKey, nil
case "String":
return String, nil
case "Array":
return Array, nil
case "InteropInterface":
return InteropInterface, nil
case "Void":
return Void, nil
default:
return Unknown, errors.Errorf("unknown stack parameter type: %s", s)
}
}
// UnmarshalJSON sets StackParamType from JSON-encoded data.
func (t *StackParamType) UnmarshalJSON(data []byte) (err error) {
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var (
s = string(data)
l = len(s)
)
if l < 2 || s[0] != '"' || s[l-1] != '"' {
*t = Unknown
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return errors.Errorf("invalid type: %s", s)
}
*t, err = StackParamTypeFromString(s[1 : l-1])
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return
}
// StackParam represent a stack parameter.
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type StackParam struct {
Type StackParamType `json:"type"`
Value interface{} `json:"value"`
}
type rawStackParam struct {
Type StackParamType `json:"type"`
Value json.RawMessage `json:"value"`
}
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// UnmarshalJSON implements Unmarshaler interface.
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func (p *StackParam) UnmarshalJSON(data []byte) (err error) {
var (
r rawStackParam
i int64
s string
b []byte
)
if err = json.Unmarshal(data, &r); err != nil {
return
}
switch p.Type = r.Type; r.Type {
case ByteArray:
if err = json.Unmarshal(r.Value, &s); err != nil {
return
}
if b, err = hex.DecodeString(s); err != nil {
return
}
p.Value = b
case String:
if err = json.Unmarshal(r.Value, &s); err != nil {
return
}
p.Value = s
case Integer:
if err = json.Unmarshal(r.Value, &i); err == nil {
p.Value = i
return
}
// sometimes integer comes as string
if err = json.Unmarshal(r.Value, &s); err != nil {
return
}
if i, err = strconv.ParseInt(s, 10, 64); err != nil {
return
}
p.Value = i
case Array:
// https://github.com/neo-project/neo/blob/3d59ecca5a8deb057bdad94b3028a6d5e25ac088/neo/Network/RPC/RpcServer.cs#L67
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var rs []StackParam
if err = json.Unmarshal(r.Value, &rs); err != nil {
return
}
p.Value = rs
case Hash160:
var h util.Uint160
if err = json.Unmarshal(r.Value, &h); err != nil {
return
}
p.Value = h
case Hash256:
var h util.Uint256
if err = json.Unmarshal(r.Value, &h); err != nil {
return
}
p.Value = h
default:
return errors.New("not implemented")
}
return
}
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// StackParams is an array of StackParam (TODO: drop it?).
type StackParams []StackParam
// TryParseArray converts an array of StackParam into an array of more appropriate things.
func (p StackParams) TryParseArray(vals ...interface{}) error {
var (
err error
i int
par StackParam
)
if len(p) != len(vals) {
return errors.New("receiver array doesn't fit the StackParams length")
}
for i, par = range p {
if err = par.TryParse(vals[i]); err != nil {
return err
}
}
return nil
}
// TryParse converts one StackParam into something more appropriate.
func (p StackParam) TryParse(dest interface{}) error {
var (
err error
ok bool
data []byte
)
switch p.Type {
case ByteArray:
if data, ok = p.Value.([]byte); !ok {
return errors.Errorf("failed to cast %s to []byte", p.Value)
}
switch dest := dest.(type) {
case *util.Uint160:
if *dest, err = util.Uint160DecodeBytes(data); err != nil {
return err
}
return nil
case *[]byte:
*dest = data
return nil
case *util.Uint256:
if *dest, err = util.Uint256DecodeReverseBytes(data); err != nil {
return err
}
return nil
case *int64, *int32, *int16, *int8, *int, *uint64, *uint32, *uint16, *uint8, *uint:
i := bytesToUint64(data)
switch dest := dest.(type) {
case *int64:
*dest = int64(i)
case *int32:
*dest = int32(i)
case *int16:
*dest = int16(i)
case *int8:
*dest = int8(i)
case *int:
*dest = int(i)
case *uint64:
*dest = i
case *uint32:
*dest = uint32(i)
case *uint16:
*dest = uint16(i)
case *uint8:
*dest = uint8(i)
case *uint:
*dest = uint(i)
}
case *string:
*dest = string(data)
return nil
default:
return errors.Errorf("cannot cast stackparam of type %s to type %s", p.Type, dest)
}
default:
return errors.New("cannot define stackparam type")
}
return nil
}
func bytesToUint64(b []byte) uint64 {
data := make([]byte, 8)
copy(data[8-len(b):], util.ArrayReverse(b))
return binary.BigEndian.Uint64(data)
}