neo-go/pkg/smartcontract/manifest/event.go

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package manifest
import (
"errors"
"fmt"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// Event is a description of a single event.
type Event struct {
Name string `json:"name"`
Parameters []Parameter `json:"parameters"`
}
// IsValid checks Event consistency and correctness.
func (e *Event) IsValid() error {
if e.Name == "" {
return errors.New("empty or absent name")
}
return Parameters(e.Parameters).AreValid()
}
// ToStackItem converts Event to stackitem.Item.
func (e *Event) ToStackItem() stackitem.Item {
params := make([]stackitem.Item, len(e.Parameters))
for i := range e.Parameters {
params[i] = e.Parameters[i].ToStackItem()
}
return stackitem.NewStruct([]stackitem.Item{
stackitem.Make(e.Name),
stackitem.Make(params),
})
}
// FromStackItem converts stackitem.Item to Event.
func (e *Event) FromStackItem(item stackitem.Item) error {
var err error
if item.Type() != stackitem.StructT {
return errors.New("invalid Event stackitem type")
}
event := item.Value().([]stackitem.Item)
if len(event) != 2 {
return errors.New("invalid Event stackitem length")
}
e.Name, err = stackitem.ToString(event[0])
if err != nil {
return err
}
if event[1].Type() != stackitem.ArrayT {
return errors.New("invalid Params stackitem type")
}
params := event[1].Value().([]stackitem.Item)
e.Parameters = make([]Parameter, len(params))
for i := range params {
p := new(Parameter)
if err := p.FromStackItem(params[i]); err != nil {
return err
}
e.Parameters[i] = *p
}
return nil
}
// CheckCompliance checks compliance of the given array of items with the
// current event.
func (e *Event) CheckCompliance(items []stackitem.Item) error {
if len(items) != len(e.Parameters) {
return fmt.Errorf("mismatch between the number of parameters and items: %d vs %d", len(e.Parameters), len(items))
}
for i := range items {
if !e.Parameters[i].Type.Match(items[i]) {
return fmt.Errorf("parameter %d type mismatch: %s (manifest) vs %s (notification)", i, e.Parameters[i].Type.String(), items[i].Type().String())
}
}
return nil
}