neoneo-go/pkg/core/mempoolevent/event.go

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package mempoolevent
import (
"encoding/json"
"errors"
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
)
// Type represents mempool event type.
type Type byte
const (
// TransactionAdded marks transaction addition mempool event.
TransactionAdded Type = 0x01
// TransactionRemoved marks transaction removal mempool event.
TransactionRemoved Type = 0x02
)
// Event represents one of mempool events: transaction was added or removed from mempool.
type Event struct {
Type Type
Tx *transaction.Transaction
Data interface{}
}
// String is a Stringer implementation.
func (e Type) String() string {
switch e {
case TransactionAdded:
return "added"
case TransactionRemoved:
return "removed"
default:
return "unknown"
}
}
// GetEventTypeFromString converts input string into an Type if it's possible.
func GetEventTypeFromString(s string) (Type, error) {
switch s {
case "added":
return TransactionAdded, nil
case "removed":
return TransactionRemoved, nil
default:
return 0, errors.New("invalid event type name")
}
}
// MarshalJSON implements json.Marshaler interface.
func (e Type) MarshalJSON() ([]byte, error) {
return json.Marshal(e.String())
}
// UnmarshalJSON implements json.Unmarshaler interface.
func (e *Type) UnmarshalJSON(b []byte) error {
var s string
err := json.Unmarshal(b, &s)
if err != nil {
return err
}
id, err := GetEventTypeFromString(s)
if err != nil {
return err
}
*e = id
return nil
}