/* Copyright 2021 The Kubernetes Authors All rights reserved. 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 main import ( "flag" "fmt" "log" "net/http" "sync" "time" "github.com/spf13/viper" "k8s.io/minikube/pkg/minikube/cluster" "k8s.io/minikube/pkg/minikube/command" "k8s.io/minikube/pkg/minikube/config" "k8s.io/minikube/pkg/minikube/cruntime" "k8s.io/minikube/pkg/minikube/exit" "k8s.io/minikube/pkg/minikube/mustload" "k8s.io/minikube/pkg/minikube/out" "k8s.io/minikube/pkg/minikube/reason" "k8s.io/minikube/pkg/minikube/style" ) var unpauseRequests = make(chan struct{}) var done = make(chan struct{}) var mu sync.Mutex var runtimePaused bool var version = "0.0.1" var runtime = flag.String("container-runtime", "docker", "Container runtime to use for (un)pausing") func main() { flag.Parse() profile := viper.GetString(config.ProfileName) _, cfg := mustload.Partial(profile) interval := cfg.AutoPauseInterval tickerChannel := time.NewTicker(interval) // Check current state alreadyPaused() // channel for incoming messages go func() { for { select { case <-tickerChannel.C: runPause() case <-unpauseRequests: fmt.Printf("Got request\n") if runtimePaused { runUnpause() // Reset once cluster has been unpaused. tickerChannel.Reset(interval) // Avoid race where tick happens before Reset call and after unPause. for { select { case <-tickerChannel.C: default: break } } } done <- struct{}{} } } }() http.HandleFunc("/", handler) // each request calls handler fmt.Printf("Starting auto-pause server %s at port 8080 \n", version) log.Fatal(http.ListenAndServe("0.0.0.0:8080", nil)) } // handler echoes the Path component of the requested URL. func handler(w http.ResponseWriter, _ *http.Request) { unpauseRequests <- struct{}{} <-done fmt.Fprintf(w, "allow") } func runPause() { mu.Lock() defer mu.Unlock() if runtimePaused { out.Styled(style.AddonEnable, "Auto-pause is already enabled.") return } r := command.NewExecRunner(true) cr, err := cruntime.New(cruntime.Config{Type: *runtime, Runner: r}) if err != nil { exit.Error(reason.InternalNewRuntime, "Failed runtime", err) } uids, err := cluster.Pause(cr, r, []string{"kube-system"}) if err != nil { exit.Error(reason.GuestPause, "Pause", err) } runtimePaused = true out.Step(style.Unpause, "Paused {{.count}} containers", out.V{"count": len(uids)}) } func runUnpause() { fmt.Println("unpausing...") mu.Lock() defer mu.Unlock() r := command.NewExecRunner(true) cr, err := cruntime.New(cruntime.Config{Type: *runtime, Runner: r}) if err != nil { exit.Error(reason.InternalNewRuntime, "Failed runtime", err) } uids, err := cluster.Unpause(cr, r, nil) if err != nil { exit.Error(reason.GuestUnpause, "Unpause", err) } runtimePaused = false out.Step(style.Unpause, "Unpaused {{.count}} containers", out.V{"count": len(uids)}) } func alreadyPaused() { mu.Lock() defer mu.Unlock() r := command.NewExecRunner(true) cr, err := cruntime.New(cruntime.Config{Type: *runtime, Runner: r}) if err != nil { exit.Error(reason.InternalNewRuntime, "Failed runtime", err) } runtimePaused, err = cluster.CheckIfPaused(cr, []string{"kube-system"}) if err != nil { exit.Error(reason.GuestCheckPaused, "Fail check if container paused", err) } out.Step(style.Check, "containers paused status: {{.paused}}", out.V{"paused": runtimePaused}) }