micro/register/watcher.go

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package register
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import "time"
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// Watcher is an interface that returns updates
// about services within the register.
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type Watcher interface {
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// Next is a blocking call
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Next() (*Result, error)
// Stop stops the watcher
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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 {
// Service holds register service
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Service *Service
// Action holds the action
Action string
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}
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// EventType defines register event type
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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
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Delete
// Update is emitted when an existing service is updated
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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 register event
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type Event struct {
// Timestamp is event timestamp
Timestamp time.Time
// Service is register service
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Service *Service
// ID is register id
ID string
// Type defines type of event
Type EventType
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}