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c4b4e1bc38
https://mattermost.atlassian.net/browse/MM-36271 ```release-note We bump the major version to 6.0 ```
37 lines
1.3 KiB
Go
37 lines
1.3 KiB
Go
// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
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// See LICENSE.txt for license information.
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package app
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import (
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"github.com/mattermost/mattermost-server/v6/model"
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)
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// Registers a given function to be called when the cluster leader may have changed. Returns a unique ID for the
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// listener which can later be used to remove it. If clustering is not enabled in this build, the callback will never
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// be called.
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func (s *Server) AddClusterLeaderChangedListener(listener func()) string {
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id := model.NewId()
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s.clusterLeaderListeners.Store(id, listener)
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return id
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}
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// Removes a listener function by the unique ID returned when AddConfigListener was called
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func (s *Server) RemoveClusterLeaderChangedListener(id string) {
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s.clusterLeaderListeners.Delete(id)
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}
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func (s *Server) InvokeClusterLeaderChangedListeners() {
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s.Log.Info("Cluster leader changed. Invoking ClusterLeaderChanged listeners.")
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// This needs to be run in a separate goroutine otherwise a recursive lock happens
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// because the listener function eventually ends up calling .IsLeader().
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// Fixing this would require the changed event to pass the leader directly, but that
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// requires a lot of work.
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s.Go(func() {
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s.clusterLeaderListeners.Range(func(_, listener interface{}) bool {
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listener.(func())()
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return true
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})
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})
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}
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