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Implement support for watch initialization in P&F
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85 changes: 85 additions & 0 deletions
85
staging/src/k8s.io/apiserver/pkg/util/flowcontrol/apf_context.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| /* | ||
| 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. | ||
| */ | ||
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| package flowcontrol | ||
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| import ( | ||
| "context" | ||
| "sync" | ||
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| "k8s.io/klog/v2" | ||
| ) | ||
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| type priorityAndFairnessKeyType int | ||
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| const ( | ||
| // priorityAndFairnessInitializationSignalKey is a key under which | ||
| // initialization signal function for watch requests is stored | ||
| // in the context. | ||
| priorityAndFairnessInitializationSignalKey priorityAndFairnessKeyType = iota | ||
| ) | ||
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| // WithInitializationSignal creates a copy of parent context with | ||
| // priority and fairness initialization signal value. | ||
| func WithInitializationSignal(ctx context.Context, signal InitializationSignal) context.Context { | ||
| return context.WithValue(ctx, priorityAndFairnessInitializationSignalKey, signal) | ||
| } | ||
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| // initializationSignalFrom returns an initialization signal function | ||
| // which when called signals that watch initialization has already finished | ||
| // to priority and fairness dispatcher. | ||
| func initializationSignalFrom(ctx context.Context) (InitializationSignal, bool) { | ||
| signal, ok := ctx.Value(priorityAndFairnessInitializationSignalKey).(InitializationSignal) | ||
| return signal, ok && signal != nil | ||
| } | ||
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| // WatchInitialized sends a signal to priority and fairness dispatcher | ||
| // that a given watch request has already been initialized. | ||
| func WatchInitialized(ctx context.Context) { | ||
| if signal, ok := initializationSignalFrom(ctx); ok { | ||
| klog.Errorf("QQQ: Marking watch initialized") | ||
| signal.Signal() | ||
| } | ||
| } | ||
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| // InitializationSignal is an interface that allows sending and handling | ||
| // initialization signals. | ||
| type InitializationSignal interface { | ||
| // Signal notifies the dispatcher about finished initialization. | ||
| Signal() | ||
| // Wait waits for the initialization signal. | ||
| Wait() | ||
| } | ||
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| type initializationSignal struct { | ||
| once sync.Once | ||
| done chan struct{} | ||
| } | ||
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| func NewInitializationSignal() InitializationSignal { | ||
| return &initializationSignal{ | ||
| once: sync.Once{}, | ||
| done: make(chan struct{}), | ||
| } | ||
| } | ||
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| func (i *initializationSignal) Signal() { | ||
| i.once.Do(func() { close(i.done) }) | ||
| } | ||
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| func (i *initializationSignal) Wait() { | ||
| <-i.done | ||
| } |