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e8381db778
* Update Kubernetes to v1.21.0 * Update to golang v1.16.2 * Update dependent modules to track with upstream * Switch to upstream flannel * Track changes to upstream cloud-controller-manager and FeatureGates Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
62 lines
2.3 KiB
Go
62 lines
2.3 KiB
Go
/*
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Copyright 2021 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package leadermigration
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import (
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internal "k8s.io/controller-manager/config"
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)
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// LeaderMigrator holds information required by the leader migration process.
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type LeaderMigrator struct {
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// MigrationReady is closed after the controller manager finishes preparing for the migration lock.
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// After this point, the leader migration process will proceed to acquire the migration lock.
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MigrationReady chan struct{}
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// FilterFunc returns a FilterResult telling the controller manager what to do with the controller.
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FilterFunc FilterFunc
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}
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// NewLeaderMigrator creates a LeaderMigrator with given config for the given component. component
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// indicates which controller manager is requesting this leader migration, and it should be consistent
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// with the component field of ControllerLeaderConfiguration.
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func NewLeaderMigrator(config *internal.LeaderMigrationConfiguration, component string) *LeaderMigrator {
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migratedControllers := make(map[string]bool)
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for _, leader := range config.ControllerLeaders {
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migratedControllers[leader.Name] = leader.Component == component
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}
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return &LeaderMigrator{
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MigrationReady: make(chan struct{}),
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FilterFunc: func(controllerName string) FilterResult {
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shouldRun, ok := migratedControllers[controllerName]
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if ok {
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// The controller is included in the migration
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if shouldRun {
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// If the controller manager should run the controller,
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// start it in the migration lock.
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return ControllerMigrated
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}
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// Otherwise, the controller should be started by
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// some other controller manager.
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return ControllerUnowned
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}
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// The controller is not included in the migration,
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// and should be started in the main lock.
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return ControllerNonMigrated
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},
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}
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}
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