111 lines
2.8 KiB
Go
111 lines
2.8 KiB
Go
package plugin // import "github.com/docker/docker/plugin"
|
|
|
|
import (
|
|
"fmt"
|
|
"reflect"
|
|
|
|
"github.com/docker/docker/api/types"
|
|
)
|
|
|
|
// Event is emitted for actions performed on the plugin manager
|
|
type Event interface {
|
|
matches(Event) bool
|
|
}
|
|
|
|
// EventCreate is an event which is emitted when a plugin is created
|
|
// This is either by pull or create from context.
|
|
//
|
|
// Use the `Interfaces` field to match only plugins that implement a specific
|
|
// interface.
|
|
// These are matched against using "or" logic.
|
|
// If no interfaces are listed, all are matched.
|
|
type EventCreate struct {
|
|
Interfaces map[string]bool
|
|
Plugin types.Plugin
|
|
}
|
|
|
|
func (e EventCreate) matches(observed Event) bool {
|
|
oe, ok := observed.(EventCreate)
|
|
if !ok {
|
|
return false
|
|
}
|
|
if len(e.Interfaces) == 0 {
|
|
return true
|
|
}
|
|
|
|
var ifaceMatch bool
|
|
for _, in := range oe.Plugin.Config.Interface.Types {
|
|
if e.Interfaces[in.Capability] {
|
|
ifaceMatch = true
|
|
break
|
|
}
|
|
}
|
|
return ifaceMatch
|
|
}
|
|
|
|
// EventRemove is an event which is emitted when a plugin is removed
|
|
// It maches on the passed in plugin's ID only.
|
|
type EventRemove struct {
|
|
Plugin types.Plugin
|
|
}
|
|
|
|
func (e EventRemove) matches(observed Event) bool {
|
|
oe, ok := observed.(EventRemove)
|
|
if !ok {
|
|
return false
|
|
}
|
|
return e.Plugin.ID == oe.Plugin.ID
|
|
}
|
|
|
|
// EventDisable is an event that is emitted when a plugin is disabled
|
|
// It maches on the passed in plugin's ID only.
|
|
type EventDisable struct {
|
|
Plugin types.Plugin
|
|
}
|
|
|
|
func (e EventDisable) matches(observed Event) bool {
|
|
oe, ok := observed.(EventDisable)
|
|
if !ok {
|
|
return false
|
|
}
|
|
return e.Plugin.ID == oe.Plugin.ID
|
|
}
|
|
|
|
// EventEnable is an event that is emitted when a plugin is disabled
|
|
// It maches on the passed in plugin's ID only.
|
|
type EventEnable struct {
|
|
Plugin types.Plugin
|
|
}
|
|
|
|
func (e EventEnable) matches(observed Event) bool {
|
|
oe, ok := observed.(EventEnable)
|
|
if !ok {
|
|
return false
|
|
}
|
|
return e.Plugin.ID == oe.Plugin.ID
|
|
}
|
|
|
|
// SubscribeEvents provides an event channel to listen for structured events from
|
|
// the plugin manager actions, CRUD operations.
|
|
// The caller must call the returned `cancel()` function once done with the channel
|
|
// or this will leak resources.
|
|
func (pm *Manager) SubscribeEvents(buffer int, watchEvents ...Event) (eventCh <-chan interface{}, cancel func()) {
|
|
topic := func(i interface{}) bool {
|
|
observed, ok := i.(Event)
|
|
if !ok {
|
|
panic(fmt.Sprintf("unexpected type passed to event channel: %v", reflect.TypeOf(i)))
|
|
}
|
|
for _, e := range watchEvents {
|
|
if e.matches(observed) {
|
|
return true
|
|
}
|
|
}
|
|
// If no specific events are specified always assume a matched event
|
|
// If some events were specified and none matched above, then the event
|
|
// doesn't match
|
|
return watchEvents == nil
|
|
}
|
|
ch := pm.publisher.SubscribeTopicWithBuffer(topic, buffer)
|
|
cancelFunc := func() { pm.publisher.Evict(ch) }
|
|
return ch, cancelFunc
|
|
}
|