neo-go/pkg/core/state/notification_event.go
2020-09-21 14:08:15 +03:00

207 lines
5.4 KiB
Go

package state
import (
"encoding/json"
"errors"
"fmt"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// NotificationEvent is a tuple of scripthash that emitted the Item as a
// notification and that item itself.
type NotificationEvent struct {
ScriptHash util.Uint160 `json:"contract"`
Name string `json:"eventname"`
Item *stackitem.Array `json:"state"`
}
// AppExecResult represent the result of the script execution, gathering together
// all resulting notifications, state, stack and other metadata.
type AppExecResult struct {
TxHash util.Uint256
Trigger trigger.Type
VMState vm.State
GasConsumed int64
Stack []stackitem.Item
Events []NotificationEvent
}
// EncodeBinary implements the Serializable interface.
func (ne *NotificationEvent) EncodeBinary(w *io.BinWriter) {
ne.ScriptHash.EncodeBinary(w)
w.WriteString(ne.Name)
stackitem.EncodeBinaryStackItem(ne.Item, w)
}
// DecodeBinary implements the Serializable interface.
func (ne *NotificationEvent) DecodeBinary(r *io.BinReader) {
ne.ScriptHash.DecodeBinary(r)
ne.Name = r.ReadString()
item := stackitem.DecodeBinaryStackItem(r)
if r.Err != nil {
return
}
arr, ok := item.Value().([]stackitem.Item)
if !ok {
r.Err = errors.New("Array or Struct expected")
return
}
ne.Item = stackitem.NewArray(arr)
}
// EncodeBinary implements the Serializable interface.
func (aer *AppExecResult) EncodeBinary(w *io.BinWriter) {
w.WriteBytes(aer.TxHash[:])
w.WriteB(byte(aer.Trigger))
w.WriteB(byte(aer.VMState))
w.WriteU64LE(uint64(aer.GasConsumed))
stackitem.EncodeBinaryStackItem(stackitem.NewArray(aer.Stack), w)
w.WriteArray(aer.Events)
}
// DecodeBinary implements the Serializable interface.
func (aer *AppExecResult) DecodeBinary(r *io.BinReader) {
r.ReadBytes(aer.TxHash[:])
aer.Trigger = trigger.Type(r.ReadB())
aer.VMState = vm.State(r.ReadB())
aer.GasConsumed = int64(r.ReadU64LE())
item := stackitem.DecodeBinaryStackItem(r)
if r.Err == nil {
arr, ok := item.Value().([]stackitem.Item)
if !ok {
r.Err = errors.New("array expected")
return
}
aer.Stack = arr
}
r.ReadArray(&aer.Events)
}
// notificationEventAux is an auxiliary struct for NotificationEvent JSON marshalling.
type notificationEventAux struct {
ScriptHash util.Uint160 `json:"contract"`
Name string `json:"eventname"`
Item json.RawMessage `json:"state"`
}
// MarshalJSON implements implements json.Marshaler interface.
func (ne *NotificationEvent) MarshalJSON() ([]byte, error) {
item, err := stackitem.ToJSONWithTypes(ne.Item)
if err != nil {
item = []byte(`"error: recursive reference"`)
}
return json.Marshal(&notificationEventAux{
ScriptHash: ne.ScriptHash,
Name: ne.Name,
Item: item,
})
}
// UnmarshalJSON implements json.Unmarshaler interface.
func (ne *NotificationEvent) UnmarshalJSON(data []byte) error {
aux := new(notificationEventAux)
if err := json.Unmarshal(data, aux); err != nil {
return err
}
item, err := stackitem.FromJSONWithTypes(aux.Item)
if err != nil {
return err
}
if t := item.Type(); t != stackitem.ArrayT {
return fmt.Errorf("failed to convert notification event state of type %s to array", t.String())
}
ne.Item = item.(*stackitem.Array)
ne.Name = aux.Name
ne.ScriptHash = aux.ScriptHash
return nil
}
// appExecResultAux is an auxiliary struct for JSON marshalling
type appExecResultAux struct {
TxHash *util.Uint256 `json:"txid"`
Trigger string `json:"trigger"`
VMState string `json:"vmstate"`
GasConsumed int64 `json:"gasconsumed,string"`
Stack json.RawMessage `json:"stack"`
Events []NotificationEvent `json:"notifications"`
}
// MarshalJSON implements implements json.Marshaler interface.
func (aer *AppExecResult) MarshalJSON() ([]byte, error) {
var st json.RawMessage
arr := make([]json.RawMessage, len(aer.Stack))
for i := range arr {
data, err := stackitem.ToJSONWithTypes(aer.Stack[i])
if err != nil {
st = []byte(`"error: recursive reference"`)
break
}
arr[i] = data
}
var err error
if st == nil {
st, err = json.Marshal(arr)
if err != nil {
return nil, err
}
}
// do not marshal block hash
var hash *util.Uint256
if aer.Trigger == trigger.Application {
hash = &aer.TxHash
}
return json.Marshal(&appExecResultAux{
TxHash: hash,
Trigger: aer.Trigger.String(),
VMState: aer.VMState.String(),
GasConsumed: aer.GasConsumed,
Stack: st,
Events: aer.Events,
})
}
// UnmarshalJSON implements implements json.Unmarshaler interface.
func (aer *AppExecResult) UnmarshalJSON(data []byte) error {
aux := new(appExecResultAux)
if err := json.Unmarshal(data, aux); err != nil {
return err
}
var arr []json.RawMessage
if err := json.Unmarshal(aux.Stack, &arr); err == nil {
st := make([]stackitem.Item, len(arr))
for i := range arr {
st[i], err = stackitem.FromJSONWithTypes(arr[i])
if err != nil {
break
}
}
if err == nil {
aer.Stack = st
}
}
trigger, err := trigger.FromString(aux.Trigger)
if err != nil {
return err
}
aer.Trigger = trigger
if aux.TxHash != nil {
aer.TxHash = *aux.TxHash
}
state, err := vm.StateFromString(aux.VMState)
if err != nil {
return err
}
aer.VMState = state
aer.Events = aux.Events
aer.GasConsumed = aux.GasConsumed
return nil
}