bpm_test.go

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

     1  // Copyright 2021 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  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  //
    15  
    16  package bpm
    17  
    18  import (
    19  	"context"
    20  	"math/rand"
    21  	"time"
    22  
    23  	"github.com/chaos-mesh/chaos-mesh/pkg/log"
    24  
    25  	. "github.com/onsi/ginkgo"
    26  	. "github.com/onsi/gomega"
    27  	"github.com/shirou/gopsutil/process"
    28  )
    29  
    30  func RandomeIdentifier() string {
    31  	var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
    32  
    33  	s := make([]rune, 10)
    34  	for i := range s {
    35  		s[i] = letters[rand.Intn(len(letters))]
    36  	}
    37  	return string(s)
    38  }
    39  
    40  func WaitProcess(m *BackgroundProcessManager, cmd *ManagedProcess, exceedTime time.Duration) {
    41  	pid := cmd.Process.Pid
    42  	procState, err := process.NewProcess(int32(pid))
    43  	Expect(err).To(BeNil())
    44  	ct, err := procState.CreateTime()
    45  	Expect(err).To(BeNil())
    46  	pair := ProcessPair{
    47  		Pid:        pid,
    48  		CreateTime: ct,
    49  	}
    50  	channel, ok := m.deathSig.Load(pair)
    51  	Expect(ok).To(BeTrue())
    52  	deathChannel := channel.(chan bool)
    53  
    54  	timeExceed := false
    55  	select {
    56  	case <-deathChannel:
    57  	case <-time.Tick(exceedTime):
    58  		timeExceed = true
    59  	}
    60  	Expect(timeExceed).To(BeFalse())
    61  }
    62  
    63  var _ = Describe("background process manager", func() {
    64  	logger, err := log.NewDefaultZapLogger()
    65  	Expect(err).To(BeNil())
    66  
    67  	m := NewBackgroundProcessManager(logger)
    68  
    69  	Context("normally exited process", func() {
    70  		It("should work", func() {
    71  			cmd := DefaultProcessBuilder("sleep", "2").Build(context.Background())
    72  			_, err := m.StartProcess(cmd)
    73  			Expect(err).To(BeNil())
    74  
    75  			WaitProcess(&m, cmd, time.Second*5)
    76  		})
    77  
    78  		It("processes with the same identifier", func() {
    79  			identifier := RandomeIdentifier()
    80  
    81  			cmd := DefaultProcessBuilder("sleep", "2").
    82  				SetIdentifier(identifier).
    83  				Build(context.Background())
    84  			_, err := m.StartProcess(cmd)
    85  			Expect(err).To(BeNil())
    86  
    87  			startTime := time.Now()
    88  			cmd2 := DefaultProcessBuilder("sleep", "2").
    89  				SetIdentifier(identifier).
    90  				Build(context.Background())
    91  			_, err = m.StartProcess(cmd2)
    92  			costedTime := time.Since(startTime)
    93  			Expect(err).To(BeNil())
    94  			Expect(costedTime.Seconds()).Should(BeNumerically(">", 1.9))
    95  
    96  			_, err = process.NewProcess(int32(cmd.Process.Pid))
    97  			Expect(err).NotTo(BeNil()) // The first process should have exited
    98  
    99  			WaitProcess(&m, cmd2, time.Second*5)
   100  		})
   101  	})
   102  
   103  	Context("kill process", func() {
   104  		It("should work", func() {
   105  			cmd := DefaultProcessBuilder("sleep", "2").Build(context.Background())
   106  			_, err := m.StartProcess(cmd)
   107  			Expect(err).To(BeNil())
   108  
   109  			pid := cmd.Process.Pid
   110  			procState, err := process.NewProcess(int32(pid))
   111  			Expect(err).To(BeNil())
   112  			ct, err := procState.CreateTime()
   113  			Expect(err).To(BeNil())
   114  
   115  			err = m.KillBackgroundProcess(context.Background(), pid, ct)
   116  			Expect(err).To(BeNil())
   117  
   118  			_, err = process.NewProcess(int32(pid))
   119  			Expect(err).NotTo(BeNil())
   120  		})
   121  
   122  		It("process with the same identifier", func() {
   123  			identifier := RandomeIdentifier()
   124  
   125  			cmd := DefaultProcessBuilder("sleep", "2").
   126  				SetIdentifier(identifier).
   127  				Build(context.Background())
   128  			_, err := m.StartProcess(cmd)
   129  			Expect(err).To(BeNil())
   130  
   131  			pid := cmd.Process.Pid
   132  			procState, err := process.NewProcess(int32(pid))
   133  			Expect(err).To(BeNil())
   134  			ct, err := procState.CreateTime()
   135  			Expect(err).To(BeNil())
   136  
   137  			cmd2 := DefaultProcessBuilder("sleep", "2").
   138  				SetIdentifier(identifier).
   139  				Build(context.Background())
   140  
   141  			go func() {
   142  				time.Sleep(time.Second)
   143  
   144  				err = m.KillBackgroundProcess(context.Background(), pid, ct)
   145  				Expect(err).To(BeNil())
   146  			}()
   147  
   148  			startTime := time.Now()
   149  			_, err = m.StartProcess(cmd2)
   150  			costedTime := time.Since(startTime)
   151  			Expect(err).To(BeNil())
   152  			Expect(costedTime.Seconds()).Should(And(BeNumerically("<", 2), BeNumerically(">", 1)))
   153  
   154  			pid2 := cmd2.Process.Pid
   155  			procState2, err := process.NewProcess(int32(pid2))
   156  			Expect(err).To(BeNil())
   157  			ct2, err := procState2.CreateTime()
   158  			Expect(err).To(BeNil())
   159  
   160  			err = m.KillBackgroundProcess(context.Background(), pid2, ct2)
   161  			Expect(err).To(BeNil())
   162  		})
   163  	})
   164  })
   165