68 lines
1.7 KiB
Go
68 lines
1.7 KiB
Go
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// Copyright 2024 Kelvin Clement Mwinuka
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package memberlist
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import (
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"encoding/json"
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"github.com/hashicorp/memberlist"
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"log"
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)
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type EventDelegate struct {
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options EventDelegateOpts
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}
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type EventDelegateOpts struct {
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incrementNodes func()
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decrementNodes func()
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removeRaftServer func(meta NodeMeta) error
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}
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func NewEventDelegate(opts EventDelegateOpts) *EventDelegate {
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return &EventDelegate{
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options: opts,
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}
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}
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// NotifyJoin implements EventDelegate interface
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func (eventDelegate *EventDelegate) NotifyJoin(node *memberlist.Node) {
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eventDelegate.options.incrementNodes()
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}
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// NotifyLeave implements EventDelegate interface
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func (eventDelegate *EventDelegate) NotifyLeave(node *memberlist.Node) {
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eventDelegate.options.decrementNodes()
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var meta NodeMeta
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err := json.Unmarshal(node.Meta, &meta)
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if err != nil {
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log.Println("Could not get leaving node's metadata.")
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return
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}
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err = eventDelegate.options.removeRaftServer(meta)
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if err != nil {
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log.Println(err)
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}
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}
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// NotifyUpdate implements EventDelegate interface
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func (eventDelegate *EventDelegate) NotifyUpdate(node *memberlist.Node) {
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// No-Op
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}
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