k8s.io/apiserver@v0.31.1/pkg/server/options/feature.go (about) 1 /* 2 Copyright 2017 The Kubernetes Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package options 18 19 import ( 20 "fmt" 21 22 "github.com/spf13/pflag" 23 24 "k8s.io/apimachinery/pkg/runtime/serializer" 25 "k8s.io/apiserver/pkg/server" 26 utilflowcontrol "k8s.io/apiserver/pkg/util/flowcontrol" 27 "k8s.io/client-go/informers" 28 "k8s.io/client-go/kubernetes" 29 ) 30 31 type FeatureOptions struct { 32 EnableProfiling bool 33 DebugSocketPath string 34 EnableContentionProfiling bool 35 EnablePriorityAndFairness bool 36 } 37 38 func NewFeatureOptions() *FeatureOptions { 39 defaults := server.NewConfig(serializer.CodecFactory{}) 40 41 return &FeatureOptions{ 42 EnableProfiling: defaults.EnableProfiling, 43 DebugSocketPath: defaults.DebugSocketPath, 44 EnableContentionProfiling: defaults.EnableContentionProfiling, 45 EnablePriorityAndFairness: true, 46 } 47 } 48 49 func (o *FeatureOptions) AddFlags(fs *pflag.FlagSet) { 50 if o == nil { 51 return 52 } 53 54 fs.BoolVar(&o.EnableProfiling, "profiling", o.EnableProfiling, 55 "Enable profiling via web interface host:port/debug/pprof/") 56 fs.BoolVar(&o.EnableContentionProfiling, "contention-profiling", o.EnableContentionProfiling, 57 "Enable block profiling, if profiling is enabled") 58 fs.StringVar(&o.DebugSocketPath, "debug-socket-path", o.DebugSocketPath, 59 "Use an unprotected (no authn/authz) unix-domain socket for profiling with the given path") 60 fs.BoolVar(&o.EnablePriorityAndFairness, "enable-priority-and-fairness", o.EnablePriorityAndFairness, ""+ 61 "If true, replace the max-in-flight handler with an enhanced one that queues and dispatches with priority and fairness") 62 } 63 64 func (o *FeatureOptions) ApplyTo(c *server.Config, clientset kubernetes.Interface, informers informers.SharedInformerFactory) error { 65 if o == nil { 66 return nil 67 } 68 69 c.EnableProfiling = o.EnableProfiling 70 c.DebugSocketPath = o.DebugSocketPath 71 c.EnableContentionProfiling = o.EnableContentionProfiling 72 73 if o.EnablePriorityAndFairness { 74 if clientset == nil { 75 return fmt.Errorf("invalid configuration: priority and fairness requires a core Kubernetes client") 76 } 77 if c.MaxRequestsInFlight+c.MaxMutatingRequestsInFlight <= 0 { 78 return fmt.Errorf("invalid configuration: MaxRequestsInFlight=%d and MaxMutatingRequestsInFlight=%d; they must add up to something positive", c.MaxRequestsInFlight, c.MaxMutatingRequestsInFlight) 79 80 } 81 c.FlowControl = utilflowcontrol.New( 82 informers, 83 clientset.FlowcontrolV1(), 84 c.MaxRequestsInFlight+c.MaxMutatingRequestsInFlight, 85 ) 86 } 87 88 return nil 89 } 90 91 func (o *FeatureOptions) Validate() []error { 92 if o == nil { 93 return nil 94 } 95 96 errs := []error{} 97 return errs 98 }