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/onsi/ginkgo"
    24  	. "github.com/onsi/gomega"
    25  	"github.com/shirou/gopsutil/process"
    26  )
    27  
    28  func RandomeIdentifier() string {
    29  	var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
    30  
    31  	s := make([]rune, 10)
    32  	for i := range s {
    33  		s[i] = letters[rand.Intn(len(letters))]
    34  	}
    35  	return string(s)
    36  }
    37  
    38  func WaitProcess(m *BackgroundProcessManager, cmd *ManagedProcess, exceedTime time.Duration) {
    39  	pid := cmd.Process.Pid
    40  	procState, err := process.NewProcess(int32(pid))
    41  	Expect(err).To(BeNil())
    42  	ct, err := procState.CreateTime()
    43  	Expect(err).To(BeNil())
    44  	pair := ProcessPair{
    45  		Pid:        pid,
    46  		CreateTime: ct,
    47  	}
    48  	channel, ok := m.deathSig.Load(pair)
    49  	Expect(ok).To(BeTrue())
    50  	deathChannel := channel.(chan bool)
    51  
    52  	timeExceed := false
    53  	select {
    54  	case <-deathChannel:
    55  	case <-time.Tick(exceedTime):
    56  		timeExceed = true
    57  	}
    58  	Expect(timeExceed).To(BeFalse())
    59  }
    60  
    61  var _ = Describe("background process manager", func() {
    62  	m := NewBackgroundProcessManager()
    63  
    64  	Context("normally exited process", func() {
    65  		It("should work", func() {
    66  			cmd := DefaultProcessBuilder("sleep", "2").Build()
    67  			_, err := m.StartProcess(cmd)
    68  			Expect(err).To(BeNil())
    69  
    70  			WaitProcess(&m, cmd, time.Second*5)
    71  		})
    72  
    73  		It("processes with the same identifier", func() {
    74  			identifier := RandomeIdentifier()
    75  
    76  			cmd := DefaultProcessBuilder("sleep", "2").
    77  				SetIdentifier(identifier).
    78  				Build()
    79  			_, err := m.StartProcess(cmd)
    80  			Expect(err).To(BeNil())
    81  
    82  			startTime := time.Now()
    83  			cmd2 := DefaultProcessBuilder("sleep", "2").
    84  				SetIdentifier(identifier).
    85  				Build()
    86  			_, err = m.StartProcess(cmd2)
    87  			costedTime := time.Since(startTime)
    88  			Expect(err).To(BeNil())
    89  			Expect(costedTime.Seconds()).Should(BeNumerically(">", 1.9))
    90  
    91  			_, err = process.NewProcess(int32(cmd.Process.Pid))
    92  			Expect(err).NotTo(BeNil()) // The first process should have exited
    93  
    94  			WaitProcess(&m, cmd2, time.Second*5)
    95  		})
    96  	})
    97  
    98  	Context("kill process", func() {
    99  		It("should work", func() {
   100  			cmd := DefaultProcessBuilder("sleep", "2").Build()
   101  			_, err := m.StartProcess(cmd)
   102  			Expect(err).To(BeNil())
   103  
   104  			pid := cmd.Process.Pid
   105  			procState, err := process.NewProcess(int32(pid))
   106  			Expect(err).To(BeNil())
   107  			ct, err := procState.CreateTime()
   108  			Expect(err).To(BeNil())
   109  
   110  			err = m.KillBackgroundProcess(context.Background(), pid, ct)
   111  			Expect(err).To(BeNil())
   112  
   113  			_, err = process.NewProcess(int32(pid))
   114  			Expect(err).NotTo(BeNil())
   115  		})
   116  
   117  		It("process with the same identifier", func() {
   118  			identifier := RandomeIdentifier()
   119  
   120  			cmd := DefaultProcessBuilder("sleep", "2").
   121  				SetIdentifier(identifier).
   122  				Build()
   123  			_, err := m.StartProcess(cmd)
   124  			Expect(err).To(BeNil())
   125  
   126  			pid := cmd.Process.Pid
   127  			procState, err := process.NewProcess(int32(pid))
   128  			Expect(err).To(BeNil())
   129  			ct, err := procState.CreateTime()
   130  			Expect(err).To(BeNil())
   131  
   132  			cmd2 := DefaultProcessBuilder("sleep", "2").
   133  				SetIdentifier(identifier).
   134  				Build()
   135  
   136  			go func() {
   137  				time.Sleep(time.Second)
   138  
   139  				err = m.KillBackgroundProcess(context.Background(), pid, ct)
   140  				Expect(err).To(BeNil())
   141  			}()
   142  
   143  			startTime := time.Now()
   144  			_, err = m.StartProcess(cmd2)
   145  			costedTime := time.Since(startTime)
   146  			Expect(err).To(BeNil())
   147  			Expect(costedTime.Seconds()).Should(And(BeNumerically("<", 2), BeNumerically(">", 1)))
   148  
   149  			pid2 := cmd2.Process.Pid
   150  			procState2, err := process.NewProcess(int32(pid2))
   151  			Expect(err).To(BeNil())
   152  			ct2, err := procState2.CreateTime()
   153  			Expect(err).To(BeNil())
   154  
   155  			err = m.KillBackgroundProcess(context.Background(), pid2, ct2)
   156  			Expect(err).To(BeNil())
   157  		})
   158  	})
   159  })
   160