bpm_test.go

Documentation: github.com/chaos-mesh/chaos-mesh/pkg/bpm

     1  // Copyright 2020 Chaos Mesh Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package bpm
    15  
    16  import (
    17  	"context"
    18  	"math/rand"
    19  	"testing"
    20  	"time"
    21  
    22  	. "github.com/onsi/ginkgo"
    23  	. "github.com/onsi/gomega"
    24  	"github.com/shirou/gopsutil/process"
    25  	"sigs.k8s.io/controller-runtime/pkg/envtest"
    26  )
    27  
    28  func TestBpm(t *testing.T) {
    29  	RegisterFailHandler(Fail)
    30  
    31  	RunSpecsWithDefaultAndCustomReporters(t,
    32  		"Background Process Manager Suite",
    33  		[]Reporter{envtest.NewlineReporter{}})
    34  }
    35  
    36  func RandomeIdentifier() string {
    37  	var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
    38  
    39  	s := make([]rune, 10)
    40  	for i := range s {
    41  		s[i] = letters[rand.Intn(len(letters))]
    42  	}
    43  	return string(s)
    44  }
    45  
    46  func WaitProcess(m *BackgroundProcessManager, cmd *ManagedProcess, exceedTime time.Duration) {
    47  	pid := cmd.Process.Pid
    48  	procState, err := process.NewProcess(int32(pid))
    49  	Expect(err).To(BeNil())
    50  	ct, err := procState.CreateTime()
    51  	Expect(err).To(BeNil())
    52  	pair := ProcessPair{
    53  		Pid:        pid,
    54  		CreateTime: ct,
    55  	}
    56  	channel, ok := m.deathSig.Load(pair)
    57  	Expect(ok).To(BeTrue())
    58  	deathChannel := channel.(chan bool)
    59  
    60  	timeExceed := false
    61  	select {
    62  	case <-deathChannel:
    63  	case <-time.Tick(exceedTime):
    64  		timeExceed = true
    65  	}
    66  	Expect(timeExceed).To(BeFalse())
    67  }
    68  
    69  var _ = Describe("background process manager", func() {
    70  	m := NewBackgroundProcessManager()
    71  
    72  	Context("normally exited process", func() {
    73  		It("should work", func() {
    74  			cmd := DefaultProcessBuilder("sleep", "2").Build()
    75  			err := m.StartProcess(cmd)
    76  			Expect(err).To(BeNil())
    77  
    78  			WaitProcess(&m, cmd, time.Second*5)
    79  		})
    80  
    81  		It("processes with the same identifier", func() {
    82  			identifier := RandomeIdentifier()
    83  
    84  			cmd := DefaultProcessBuilder("sleep", "2").
    85  				SetIdentifier(identifier).
    86  				Build()
    87  			err := m.StartProcess(cmd)
    88  			Expect(err).To(BeNil())
    89  
    90  			startTime := time.Now()
    91  			cmd2 := DefaultProcessBuilder("sleep", "2").
    92  				SetIdentifier(identifier).
    93  				Build()
    94  			err = m.StartProcess(cmd2)
    95  			costedTime := time.Since(startTime)
    96  			Expect(err).To(BeNil())
    97  			Expect(costedTime.Seconds()).Should(BeNumerically(">", 1.9))
    98  
    99  			_, err = process.NewProcess(int32(cmd.Process.Pid))
   100  			Expect(err).NotTo(BeNil()) // The first process should have exited
   101  
   102  			WaitProcess(&m, cmd2, time.Second*5)
   103  		})
   104  	})
   105  
   106  	Context("kill process", func() {
   107  		It("should work", func() {
   108  			cmd := DefaultProcessBuilder("sleep", "2").Build()
   109  			err := m.StartProcess(cmd)
   110  			Expect(err).To(BeNil())
   111  
   112  			pid := cmd.Process.Pid
   113  			procState, err := process.NewProcess(int32(pid))
   114  			Expect(err).To(BeNil())
   115  			ct, err := procState.CreateTime()
   116  			Expect(err).To(BeNil())
   117  
   118  			err = m.KillBackgroundProcess(context.Background(), pid, ct)
   119  			Expect(err).To(BeNil())
   120  
   121  			procState, err = process.NewProcess(int32(pid))
   122  			Expect(err).NotTo(BeNil())
   123  		})
   124  
   125  		It("process with the same identifier", func() {
   126  			identifier := RandomeIdentifier()
   127  
   128  			cmd := DefaultProcessBuilder("sleep", "2").
   129  				SetIdentifier(identifier).
   130  				Build()
   131  			err := m.StartProcess(cmd)
   132  			Expect(err).To(BeNil())
   133  
   134  			pid := cmd.Process.Pid
   135  			procState, err := process.NewProcess(int32(pid))
   136  			Expect(err).To(BeNil())
   137  			ct, err := procState.CreateTime()
   138  			Expect(err).To(BeNil())
   139  
   140  			cmd2 := DefaultProcessBuilder("sleep", "2").
   141  				SetIdentifier(identifier).
   142  				Build()
   143  
   144  			go func() {
   145  				time.Sleep(time.Second)
   146  
   147  				err = m.KillBackgroundProcess(context.Background(), pid, ct)
   148  				Expect(err).To(BeNil())
   149  			}()
   150  
   151  			startTime := time.Now()
   152  			err = m.StartProcess(cmd2)
   153  			costedTime := time.Since(startTime)
   154  			Expect(err).To(BeNil())
   155  			Expect(costedTime.Seconds()).Should(And(BeNumerically("<", 2), BeNumerically(">", 1)))
   156  
   157  			pid2 := cmd2.Process.Pid
   158  			procState2, err := process.NewProcess(int32(pid2))
   159  			Expect(err).To(BeNil())
   160  			ct2, err := procState2.CreateTime()
   161  			Expect(err).To(BeNil())
   162  
   163  			err = m.KillBackgroundProcess(context.Background(), pid2, ct2)
   164  			Expect(err).To(BeNil())
   165  		})
   166  	})
   167  })
   168