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Implement watch-based daemonset replica counter.
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156 changes: 156 additions & 0 deletions
156
clusterloader2/pkg/measurement/util/runtimeobjects/replicaswatcher.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,156 @@ | ||
| /* | ||
| Copyright 2021 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. | ||
| */ | ||
|
|
||
| package runtimeobjects | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "sync" | ||
| "time" | ||
|
|
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| corev1 "k8s.io/api/core/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/labels" | ||
| clientset "k8s.io/client-go/kubernetes" | ||
| "k8s.io/klog" | ||
| "k8s.io/perf-tests/clusterloader2/pkg/measurement/util" | ||
| "k8s.io/perf-tests/clusterloader2/pkg/measurement/util/informer" | ||
| ) | ||
|
|
||
| const ( | ||
| informerSyncTimeout = time.Minute | ||
| ) | ||
|
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| // ReplicasWatcher is a struct that allows to check a number of replicas at a given time. | ||
| // Usage: | ||
| // var rw ReplicasWatcher = (...) | ||
| // if err := rw.Start(); err != nil { | ||
| // panic(err); | ||
| // } | ||
| // // Get number of replicas as needed. | ||
| // val = rw.Replicas() | ||
| // ... | ||
| // val = rw.Replicas() | ||
| // | ||
| // // Once you are done... | ||
| // rw.Stop(); | ||
| type ReplicasWatcher interface { | ||
| Replicas() int | ||
| // Start must block until Replicas() starts returning correct value. | ||
| Start() error | ||
| Stop() | ||
| } | ||
|
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| type ConstReplicas struct { | ||
| ReplicasVal int | ||
| } | ||
|
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| func (c *ConstReplicas) Replicas() int { | ||
| return c.ReplicasVal | ||
| } | ||
|
|
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| func (c *ConstReplicas) Start() error { | ||
| return nil | ||
| } | ||
| func (c *ConstReplicas) Stop() {} | ||
|
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| var _ ReplicasWatcher = &ConstReplicas{} | ||
|
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| // nodeCounter counts a number of node objects matching nodeSelector and affinity. | ||
| type nodeCounter struct { | ||
| client clientset.Interface | ||
| nodeSelector labels.Selector | ||
| affinity *corev1.Affinity | ||
| stopCh chan struct{} | ||
|
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| mu sync.Mutex | ||
| replicas int | ||
| } | ||
|
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| var _ ReplicasWatcher = &nodeCounter{} | ||
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| func NewNodeCounter(client clientset.Interface, nodeSelector labels.Selector, affinity *corev1.Affinity) *nodeCounter { | ||
| return &nodeCounter{ | ||
| client: client, | ||
| nodeSelector: nodeSelector, | ||
| affinity: affinity, | ||
| stopCh: make(chan struct{}), | ||
| } | ||
| } | ||
|
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| func (n *nodeCounter) Start() error { | ||
| i := informer.NewInformer( | ||
| n.client, | ||
| "nodes", | ||
| &util.ObjectSelector{ | ||
| Namespace: metav1.NamespaceAll, | ||
| LabelSelector: n.nodeSelector.String(), | ||
| }, | ||
| func(oldObj, newObj interface{}) { | ||
| if err := n.handleObject(oldObj, newObj); err != nil { | ||
| klog.Errorf("Error while processing node: %v", err) | ||
| } | ||
| }, | ||
| ) | ||
| return informer.StartAndSync(i, n.stopCh, informerSyncTimeout) | ||
| } | ||
|
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| func (n *nodeCounter) Stop() {} | ||
|
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| func (n *nodeCounter) handleObject(oldObj, newObj interface{}) error { | ||
| old, err := n.shouldRun(oldObj) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| new, err := n.shouldRun(newObj) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if new == old { | ||
| return nil | ||
| } | ||
| n.mu.Lock() | ||
| defer n.mu.Unlock() | ||
| if new && !old { | ||
| n.replicas++ | ||
| } else { | ||
| n.replicas-- | ||
| } | ||
| klog.Infof("Updated expected replicas: %v", n.replicas) | ||
| return nil | ||
| } | ||
|
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| func (n *nodeCounter) Replicas() int { return n.replicas } | ||
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| func (n *nodeCounter) shouldRun(obj interface{}) (bool, error) { | ||
| if obj == nil { | ||
| return false, nil | ||
| } | ||
| node, ok := obj.(*corev1.Node) | ||
| if !ok { | ||
| return false, fmt.Errorf("unexpected type of obj: %v. got %T, want *corev1.Node", obj, obj) | ||
| } | ||
| matched, err := podMatchesNodeAffinity(n.affinity, node) | ||
| return !node.Spec.Unschedulable && matched, err | ||
| } | ||
|
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| func GetReplicasOnce(rw ReplicasWatcher) (int, error) { | ||
| if err := rw.Start(); err != nil { | ||
| return 0, err | ||
| } | ||
| defer rw.Stop() | ||
| return rw.Replicas(), nil | ||
| } |
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