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notification_event.go
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notification_event.go
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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/stackitem"
"github.com/nspcc-dev/neo-go/pkg/vm/vmstate"
)
// NotificationEvent is a tuple of the scripthash that has emitted the Item as a
// notification and the item itself.
type NotificationEvent struct {
ScriptHash util.Uint160 `json:"contract"`
Name string `json:"eventname"`
Item *stackitem.Array `json:"state"`
}
// AppExecResult represents the result of the script execution, gathering together
// all resulting notifications, state, stack and other metadata.
type AppExecResult struct {
Container util.Uint256
Execution
}
// ContainedNotificationEvent represents a wrapper for a notification from script execution.
type ContainedNotificationEvent struct {
// Container hash is the hash of script container which is either a block or a transaction.
Container util.Uint256
NotificationEvent
}
// EncodeBinary implements the Serializable interface.
func (ne *NotificationEvent) EncodeBinary(w *io.BinWriter) {
ne.EncodeBinaryWithContext(w, stackitem.NewSerializationContext())
}
// EncodeBinaryWithContext is the same as EncodeBinary, but allows to efficiently reuse
// stack item serialization context.
func (ne *NotificationEvent) EncodeBinaryWithContext(w *io.BinWriter, sc *stackitem.SerializationContext) {
ne.ScriptHash.EncodeBinary(w)
w.WriteString(ne.Name)
b, err := sc.Serialize(ne.Item, false)
if err != nil {
w.Err = err
return
}
w.WriteBytes(b)
}
// DecodeBinary implements the Serializable interface.
func (ne *NotificationEvent) DecodeBinary(r *io.BinReader) {
ne.ScriptHash.DecodeBinary(r)
ne.Name = r.ReadString()
item := stackitem.DecodeBinary(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) {
aer.EncodeBinaryWithContext(w, stackitem.NewSerializationContext())
}
// EncodeBinaryWithContext is the same as EncodeBinary, but allows to efficiently reuse
// stack item serialization context.
func (aer *AppExecResult) EncodeBinaryWithContext(w *io.BinWriter, sc *stackitem.SerializationContext) {
w.WriteBytes(aer.Container[:])
w.WriteB(byte(aer.Trigger))
w.WriteB(byte(aer.VMState))
w.WriteU64LE(uint64(aer.GasConsumed))
// Stack items are expected to be marshaled one by one.
w.WriteVarUint(uint64(len(aer.Stack)))
for _, it := range aer.Stack {
b, err := sc.Serialize(it, true)
if err != nil {
w.Err = err
return
}
w.WriteBytes(b)
}
w.WriteVarUint(uint64(len(aer.Events)))
for i := range aer.Events {
aer.Events[i].EncodeBinaryWithContext(w, sc)
}
w.WriteVarBytes([]byte(aer.FaultException))
}
// DecodeBinary implements the Serializable interface.
func (aer *AppExecResult) DecodeBinary(r *io.BinReader) {
r.ReadBytes(aer.Container[:])
aer.Trigger = trigger.Type(r.ReadB())
aer.VMState = vmstate.State(r.ReadB())
aer.GasConsumed = int64(r.ReadU64LE())
sz := r.ReadVarUint()
if stackitem.MaxDeserialized < sz && r.Err == nil {
r.Err = errors.New("invalid format")
}
if r.Err != nil {
return
}
arr := make([]stackitem.Item, sz)
for i := 0; i < int(sz); i++ {
arr[i] = stackitem.DecodeBinaryProtected(r)
if r.Err != nil {
return
}
}
aer.Stack = arr
r.ReadArray(&aer.Events)
aer.FaultException = r.ReadString()
}
// 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 the json.Marshaler interface.
func (ne NotificationEvent) MarshalJSON() ([]byte, error) {
item, err := stackitem.ToJSONWithTypes(ne.Item)
if err != nil {
item = []byte(fmt.Sprintf(`"error: %v"`, err))
}
return json.Marshal(¬ificationEventAux{
ScriptHash: ne.ScriptHash,
Name: ne.Name,
Item: item,
})
}
// UnmarshalJSON implements the 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 {
Container util.Uint256 `json:"container"`
}
// MarshalJSON implements the json.Marshaler interface.
func (aer *AppExecResult) MarshalJSON() ([]byte, error) {
h, err := json.Marshal(&appExecResultAux{
Container: aer.Container,
})
if err != nil {
return nil, fmt.Errorf("failed to marshal hash: %w", err)
}
exec, err := json.Marshal(aer.Execution)
if err != nil {
return nil, fmt.Errorf("failed to marshal execution: %w", err)
}
if h[len(h)-1] != '}' || exec[0] != '{' {
return nil, errors.New("can't merge internal jsons")
}
h[len(h)-1] = ','
h = append(h, exec[1:]...)
return h, nil
}
// UnmarshalJSON implements the json.Unmarshaler interface.
func (aer *AppExecResult) UnmarshalJSON(data []byte) error {
aux := new(appExecResultAux)
if err := json.Unmarshal(data, aux); err != nil {
return err
}
if err := json.Unmarshal(data, &aer.Execution); err != nil {
return err
}
aer.Container = aux.Container
return nil
}
// Execution represents the result of a single script execution, gathering together
// all resulting notifications, state, stack and other metadata.
type Execution struct {
Trigger trigger.Type
VMState vmstate.State
GasConsumed int64
Stack []stackitem.Item
Events []NotificationEvent
FaultException string
}
// executionAux represents an auxiliary struct for Execution JSON marshalling.
type executionAux struct {
Trigger string `json:"trigger"`
VMState string `json:"vmstate"`
GasConsumed int64 `json:"gasconsumed,string"`
Stack json.RawMessage `json:"stack"`
Events []NotificationEvent `json:"notifications"`
FaultException *string `json:"exception"`
}
// MarshalJSON implements the json.Marshaler interface.
func (e Execution) MarshalJSON() ([]byte, error) {
arr := make([]json.RawMessage, len(e.Stack))
for i := range arr {
data, err := stackitem.ToJSONWithTypes(e.Stack[i])
if err != nil {
data = []byte(fmt.Sprintf(`"error: %v"`, err))
}
arr[i] = data
}
st, err := json.Marshal(arr)
if err != nil {
return nil, err
}
var exception *string
if e.FaultException != "" {
exception = &e.FaultException
}
return json.Marshal(&executionAux{
Trigger: e.Trigger.String(),
VMState: e.VMState.String(),
GasConsumed: e.GasConsumed,
Stack: st,
Events: e.Events,
FaultException: exception,
})
}
// UnmarshalJSON implements the json.Unmarshaler interface.
func (e *Execution) UnmarshalJSON(data []byte) error {
aux := new(executionAux)
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 {
var s string
if json.Unmarshal(arr[i], &s) != nil {
break
}
err = nil
}
}
if err == nil {
e.Stack = st
}
}
trigger, err := trigger.FromString(aux.Trigger)
if err != nil {
return err
}
e.Trigger = trigger
state, err := vmstate.FromString(aux.VMState)
if err != nil {
return err
}
e.VMState = state
e.Events = aux.Events
e.GasConsumed = aux.GasConsumed
if aux.FaultException != nil {
e.FaultException = *aux.FaultException
}
return nil
}
// containedNotificationEventAux is an auxiliary struct for JSON marshalling.
type containedNotificationEventAux struct {
Container util.Uint256 `json:"container"`
}
// MarshalJSON implements the json.Marshaler interface.
func (ne *ContainedNotificationEvent) MarshalJSON() ([]byte, error) {
h, err := json.Marshal(&containedNotificationEventAux{
Container: ne.Container,
})
if err != nil {
return nil, fmt.Errorf("failed to marshal hash: %w", err)
}
exec, err := json.Marshal(ne.NotificationEvent)
if err != nil {
return nil, fmt.Errorf("failed to marshal execution: %w", err)
}
if h[len(h)-1] != '}' || exec[0] != '{' {
return nil, errors.New("can't merge internal jsons")
}
h[len(h)-1] = ','
h = append(h, exec[1:]...)
return h, nil
}
// UnmarshalJSON implements the json.Unmarshaler interface.
func (ne *ContainedNotificationEvent) UnmarshalJSON(data []byte) error {
aux := new(containedNotificationEventAux)
if err := json.Unmarshal(data, aux); err != nil {
return err
}
if err := json.Unmarshal(data, &ne.NotificationEvent); err != nil {
return err
}
ne.Container = aux.Container
return nil
}