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Implement the permit extension point in scheduler.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| /* | ||
| Copyright 2019 The Kubernetes Authors. | ||
| 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. | ||
| */ | ||
|
|
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| package v1alpha1 | ||
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|
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| import ( | ||
| "sync" | ||
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|
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| "k8s.io/api/core/v1" | ||
| "k8s.io/apimachinery/pkg/types" | ||
| ) | ||
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| // waitingPodsMap a thread-safe map used to maintain pods waiting in the permit phase. | ||
| type waitingPodsMap struct { | ||
| pods map[types.UID]WaitingPod | ||
| mu sync.RWMutex | ||
| } | ||
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|
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| // newWaitingPodsMap returns a new waitingPodsMap. | ||
| func newWaitingPodsMap() *waitingPodsMap { | ||
| return &waitingPodsMap{ | ||
| pods: make(map[types.UID]WaitingPod), | ||
| } | ||
| } | ||
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| // add a new WaitingPod to the map. | ||
| func (m *waitingPodsMap) add(wp WaitingPod) { | ||
| m.mu.Lock() | ||
| defer m.mu.Unlock() | ||
| m.pods[wp.GetPod().UID] = wp | ||
| } | ||
|
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| // remove a WaitingPod from the map. | ||
| func (m *waitingPodsMap) remove(uid types.UID) { | ||
| m.mu.Lock() | ||
| defer m.mu.Unlock() | ||
| delete(m.pods, uid) | ||
| } | ||
|
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| // get a WaitingPod from the map. | ||
| func (m *waitingPodsMap) get(uid types.UID) WaitingPod { | ||
| m.mu.RLock() | ||
| defer m.mu.RUnlock() | ||
| return m.pods[uid] | ||
|
|
||
| } | ||
|
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| // iterate acquires a read lock and iterates over the WaitingPods map. | ||
| func (m *waitingPodsMap) iterate(callback func(WaitingPod)) { | ||
| m.mu.RLock() | ||
| defer m.mu.RUnlock() | ||
| for _, v := range m.pods { | ||
| callback(v) | ||
| } | ||
| } | ||
|
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| // waitingPod represents a pod waiting in the permit phase. | ||
| type waitingPod struct { | ||
| pod *v1.Pod | ||
| s chan *Status | ||
| } | ||
|
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| // newWaitingPod returns a new waitingPod instance. | ||
| func newWaitingPod(pod *v1.Pod) *waitingPod { | ||
| return &waitingPod{ | ||
| pod: pod, | ||
| s: make(chan *Status), | ||
| } | ||
| } | ||
|
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| // GetPod returns a reference to the waiting pod. | ||
| func (w *waitingPod) GetPod() *v1.Pod { | ||
| return w.pod | ||
| } | ||
|
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| // Allow the waiting pod to be scheduled. Returns true if the allow signal was | ||
| // successfully delivered, false otherwise. | ||
| func (w *waitingPod) Allow() bool { | ||
| select { | ||
| case w.s <- NewStatus(Success, ""): | ||
| return true | ||
| default: | ||
| return false | ||
| } | ||
| } | ||
|
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| // Reject declares the waiting pod unschedulable. Returns true if the allow signal | ||
| // was successfully delivered, false otherwise. | ||
| func (w *waitingPod) Reject(msg string) bool { | ||
| select { | ||
| case w.s <- NewStatus(Unschedulable, msg): | ||
| return true | ||
| default: | ||
| return false | ||
| } | ||
| } |
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