/
transactionstatechange.go
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/
transactionstatechange.go
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// Copyright © 2021 Attestant Limited.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package api
import (
"encoding/json"
"fmt"
"math/big"
"github.com/attestantio/go-execution-client/util"
"github.com/pkg/errors"
)
// TransactionStateChange is a change to state, from one value to another.
type TransactionStateChange struct {
From *big.Int
To *big.Int
}
// transactionStateChangeJSON is the spec representation of the struct.
type transactionStateChangeJSON struct {
Creation string `json:"+,omitempty"`
Alteration *transactionStateChangeAlterationJSON `json:"*,omitempty"`
Deletion string `json:"-,omitempty"`
}
type transactionStateChangeAlterationJSON struct {
From string `json:"from"`
To string `json:"to"`
}
// MarshalJSON implements json.Marshaler.
func (t *TransactionStateChange) MarshalJSON() ([]byte, error) {
if t.From == nil {
return json.Marshal(&transactionStateChangeJSON{
Creation: util.MarshalBigInt(t.To),
})
}
if t.To == nil {
return json.Marshal(&transactionStateChangeJSON{
Deletion: util.MarshalBigInt(t.From),
})
}
return json.Marshal(&transactionStateChangeJSON{
Alteration: &transactionStateChangeAlterationJSON{
From: util.MarshalBigInt(t.From),
To: util.MarshalBigInt(t.To),
},
})
}
// UnmarshalJSON implements json.Unmarshaler.
func (t *TransactionStateChange) UnmarshalJSON(input []byte) error {
var data transactionStateChangeJSON
if err := json.Unmarshal(input, &data); err != nil {
return errors.Wrap(err, "invalid JSON")
}
return t.unpack(&data)
}
func (t *TransactionStateChange) unpack(data *transactionStateChangeJSON) error {
var err error
if data.Creation != "" {
t.To, err = util.StrToBigInt("creation", data.Creation)
if err != nil {
return err
}
}
if data.Deletion != "" {
t.From, err = util.StrToBigInt("deletion", data.Deletion)
if err != nil {
return err
}
}
if data.Alteration != nil {
if data.Alteration.From != "" {
t.From, err = util.StrToBigInt("from", data.Alteration.From)
if err != nil {
return err
}
}
if data.Alteration.To != "" {
t.To, err = util.StrToBigInt("to", data.Alteration.To)
if err != nil {
return err
}
}
}
return nil
}
// String returns a string version of the structure.
func (t *TransactionStateChange) String() string {
data, err := json.Marshal(t)
if err != nil {
return fmt.Sprintf("ERR: %v", err)
}
return string(data)
}