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a257d501df
Purpose of this is to make in-field debugging of cluster leader issues (particularly around duplicate job scheduling) easier to debug from production server logs.
34 lines
1.1 KiB
Go
34 lines
1.1 KiB
Go
// Copyright (c) 2018-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/mlog"
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"github.com/mattermost/mattermost-server/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 (a *App) AddClusterLeaderChangedListener(listener func()) string {
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id := model.NewId()
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a.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 (a *App) RemoveClusterLeaderChangedListener(id string) {
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a.clusterLeaderListeners.Delete(id)
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}
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func (a *App) InvokeClusterLeaderChangedListeners() {
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mlog.Info("Cluster leader changed. Invoking ClusterLeaderChanged listeners.")
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a.Go(func() {
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a.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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