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  	"time"
    20  
    21  	. "github.com/onsi/ginkgo"
    22  	. "github.com/onsi/gomega"
    23  	"github.com/shirou/gopsutil/process"
    24  )
    25  
    26  func RandomeIdentifier() string {
    27  	var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
    28  
    29  	s := make([]rune, 10)
    30  	for i := range s {
    31  		s[i] = letters[rand.Intn(len(letters))]
    32  	}
    33  	return string(s)
    34  }
    35  
    36  func WaitProcess(m *BackgroundProcessManager, cmd *ManagedProcess, exceedTime time.Duration) {
    37  	pid := cmd.Process.Pid
    38  	procState, err := process.NewProcess(int32(pid))
    39  	Expect(err).To(BeNil())
    40  	ct, err := procState.CreateTime()
    41  	Expect(err).To(BeNil())
    42  	pair := ProcessPair{
    43  		Pid:        pid,
    44  		CreateTime: ct,
    45  	}
    46  	channel, ok := m.deathSig.Load(pair)
    47  	Expect(ok).To(BeTrue())
    48  	deathChannel := channel.(chan bool)
    49  
    50  	timeExceed := false
    51  	select {
    52  	case <-deathChannel:
    53  	case <-time.Tick(exceedTime):
    54  		timeExceed = true
    55  	}
    56  	Expect(timeExceed).To(BeFalse())
    57  }
    58  
    59  var _ = Describe("background process manager", func() {
    60  	m := NewBackgroundProcessManager()
    61  
    62  	Context("normally exited process", func() {
    63  		It("should work", func() {
    64  			cmd := DefaultProcessBuilder("sleep", "2").Build()
    65  			_, err := m.StartProcess(cmd)
    66  			Expect(err).To(BeNil())
    67  
    68  			WaitProcess(&m, cmd, time.Second*5)
    69  		})
    70  
    71  		It("processes with the same identifier", func() {
    72  			identifier := RandomeIdentifier()
    73  
    74  			cmd := DefaultProcessBuilder("sleep", "2").
    75  				SetIdentifier(identifier).
    76  				Build()
    77  			_, err := m.StartProcess(cmd)
    78  			Expect(err).To(BeNil())
    79  
    80  			startTime := time.Now()
    81  			cmd2 := DefaultProcessBuilder("sleep", "2").
    82  				SetIdentifier(identifier).
    83  				Build()
    84  			_, err = m.StartProcess(cmd2)
    85  			costedTime := time.Since(startTime)
    86  			Expect(err).To(BeNil())
    87  			Expect(costedTime.Seconds()).Should(BeNumerically(">", 1.9))
    88  
    89  			_, err = process.NewProcess(int32(cmd.Process.Pid))
    90  			Expect(err).NotTo(BeNil()) // The first process should have exited
    91  
    92  			WaitProcess(&m, cmd2, time.Second*5)
    93  		})
    94  	})
    95  
    96  	Context("kill process", func() {
    97  		It("should work", func() {
    98  			cmd := DefaultProcessBuilder("sleep", "2").Build()
    99  			_, err := m.StartProcess(cmd)
   100  			Expect(err).To(BeNil())
   101  
   102  			pid := cmd.Process.Pid
   103  			procState, err := process.NewProcess(int32(pid))
   104  			Expect(err).To(BeNil())
   105  			ct, err := procState.CreateTime()
   106  			Expect(err).To(BeNil())
   107  
   108  			err = m.KillBackgroundProcess(context.Background(), pid, ct)
   109  			Expect(err).To(BeNil())
   110  
   111  			procState, err = process.NewProcess(int32(pid))
   112  			Expect(err).NotTo(BeNil())
   113  		})
   114  
   115  		It("process with the same identifier", func() {
   116  			identifier := RandomeIdentifier()
   117  
   118  			cmd := DefaultProcessBuilder("sleep", "2").
   119  				SetIdentifier(identifier).
   120  				Build()
   121  			_, err := m.StartProcess(cmd)
   122  			Expect(err).To(BeNil())
   123  
   124  			pid := cmd.Process.Pid
   125  			procState, err := process.NewProcess(int32(pid))
   126  			Expect(err).To(BeNil())
   127  			ct, err := procState.CreateTime()
   128  			Expect(err).To(BeNil())
   129  
   130  			cmd2 := DefaultProcessBuilder("sleep", "2").
   131  				SetIdentifier(identifier).
   132  				Build()
   133  
   134  			go func() {
   135  				time.Sleep(time.Second)
   136  
   137  				err = m.KillBackgroundProcess(context.Background(), pid, ct)
   138  				Expect(err).To(BeNil())
   139  			}()
   140  
   141  			startTime := time.Now()
   142  			_, err = m.StartProcess(cmd2)
   143  			costedTime := time.Since(startTime)
   144  			Expect(err).To(BeNil())
   145  			Expect(costedTime.Seconds()).Should(And(BeNumerically("<", 2), BeNumerically(">", 1)))
   146  
   147  			pid2 := cmd2.Process.Pid
   148  			procState2, err := process.NewProcess(int32(pid2))
   149  			Expect(err).To(BeNil())
   150  			ct2, err := procState2.CreateTime()
   151  			Expect(err).To(BeNil())
   152  
   153  			err = m.KillBackgroundProcess(context.Background(), pid2, ct2)
   154  			Expect(err).To(BeNil())
   155  		})
   156  	})
   157  })
   158