micro/registry/watcher.go
Di Wu f9bf562393
fix typo in comments (#1840)
* remove global error tracking

* rpc_server: fix invalid register err

* fix typo

Co-authored-by: Asim Aslam <asim@aslam.me>
2020-07-16 16:33:11 +01:00

57 lines
1.1 KiB
Go

package registry
import "time"
// Watcher is an interface that returns updates
// about services within the registry.
type Watcher interface {
// Next is a blocking call
Next() (*Result, error)
Stop()
}
// Result is returned by a call to Next on
// the watcher. Actions can be create, update, delete
type Result struct {
Action string
Service *Service
}
// EventType defines registry event type
type EventType int
const (
// Create is emitted when a new service is registered
Create EventType = iota
// Delete is emitted when an existing service is deregistered
Delete
// Update is emitted when an existing service is updated
Update
)
// String returns human readable event type
func (t EventType) String() string {
switch t {
case Create:
return "create"
case Delete:
return "delete"
case Update:
return "update"
default:
return "unknown"
}
}
// Event is registry event
type Event struct {
// Id is registry id
Id string
// Type defines type of event
Type EventType
// Timestamp is event timestamp
Timestamp time.Time
// Service is registry service
Service *Service
}