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event.go
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event.go
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// Copyright 2018-2022 Lei Ni (nilei81@gmail.com) and other contributors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package registry
import (
"github.com/hashicorp/memberlist"
)
// sliceEventDelegate is used to hook into memberlist to get notification
// about nodes joining and leaving.
type sliceEventDelegate struct {
store *metaStore
}
var _ memberlist.EventDelegate = (*sliceEventDelegate)(nil)
func newSliceEventDelegate(store *metaStore) *sliceEventDelegate {
return &sliceEventDelegate{
store: store,
}
}
func (e *sliceEventDelegate) put(eventType memberlist.NodeEventType,
n *memberlist.Node) {
if eventType == memberlist.NodeJoin || eventType == memberlist.NodeUpdate {
var m meta
if m.unmarshal(n.Meta) {
e.store.put(n.Name, m)
}
} else if eventType == memberlist.NodeLeave {
e.store.delete(n.Name)
} else {
panic("unknown event type")
}
}
func (e *sliceEventDelegate) NotifyJoin(n *memberlist.Node) {
e.put(memberlist.NodeJoin, n)
}
func (e *sliceEventDelegate) NotifyLeave(n *memberlist.Node) {
e.put(memberlist.NodeLeave, n)
}
func (e *sliceEventDelegate) NotifyUpdate(n *memberlist.Node) {
e.put(memberlist.NodeUpdate, n)
}