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85 lines
2 KiB
Go
85 lines
2 KiB
Go
package response
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import (
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"encoding/json"
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"github.com/pkg/errors"
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)
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type (
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// EventID represents an event type happening on the chain.
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EventID byte
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)
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const (
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// InvalidEventID is an invalid event id that is the default value of
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// EventID. It's only used as an initial value similar to nil.
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InvalidEventID EventID = iota
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// BlockEventID is a `block_added` event.
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BlockEventID
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// TransactionEventID corresponds to `transaction_added` event.
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TransactionEventID
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// NotificationEventID represents `notification_from_execution` events.
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NotificationEventID
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// ExecutionEventID is used for `transaction_executed` events.
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ExecutionEventID
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// MissedEventID notifies user of missed events.
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MissedEventID EventID = 255
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)
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// String is a good old Stringer implementation.
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func (e EventID) String() string {
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switch e {
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case BlockEventID:
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return "block_added"
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case TransactionEventID:
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return "transaction_added"
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case NotificationEventID:
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return "notification_from_execution"
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case ExecutionEventID:
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return "transaction_executed"
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case MissedEventID:
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return "event_missed"
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default:
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return "unknown"
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}
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}
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// GetEventIDFromString converts input string into an EventID if it's possible.
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func GetEventIDFromString(s string) (EventID, error) {
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switch s {
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case "block_added":
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return BlockEventID, nil
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case "transaction_added":
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return TransactionEventID, nil
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case "notification_from_execution":
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return NotificationEventID, nil
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case "transaction_executed":
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return ExecutionEventID, nil
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case "event_missed":
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return MissedEventID, nil
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default:
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return 255, errors.New("invalid stream name")
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}
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}
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// MarshalJSON implements json.Marshaler interface.
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func (e EventID) MarshalJSON() ([]byte, error) {
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return json.Marshal(e.String())
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}
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// UnmarshalJSON implements json.Unmarshaler interface.
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func (e *EventID) UnmarshalJSON(b []byte) error {
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var s string
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err := json.Unmarshal(b, &s)
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if err != nil {
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return err
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}
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id, err := GetEventIDFromString(s)
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if err != nil {
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return err
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}
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*e = id
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return nil
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}
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