micro/registry/watcher.go

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package registry
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import "time"
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// Watcher is an interface that returns updates
// about services within the registry.
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type Watcher interface {
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// Next is a blocking call
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Next() (*Result, error)
Stop()
}
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// Result is returned by a call to Next on
// the watcher. Actions can be create, update, delete
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type Result struct {
Action string
Service *Service
}
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// 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 deregsitered
Delete
// Update is emitted when an existing servicec 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
}