podiochaosmanager.go

Documentation: github.com/chaos-mesh/chaos-mesh/controllers/chaosimpl/iochaos/podiochaosmanager

     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 podiochaosmanager
    15  
    16  import (
    17  	"context"
    18  	"errors"
    19  
    20  	"github.com/go-logr/logr"
    21  	v1 "k8s.io/api/core/v1"
    22  	k8sError "k8s.io/apimachinery/pkg/api/errors"
    23  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    24  	"k8s.io/apimachinery/pkg/runtime"
    25  	"k8s.io/apimachinery/pkg/types"
    26  	"k8s.io/client-go/util/retry"
    27  	"sigs.k8s.io/controller-runtime/pkg/client"
    28  
    29  	"github.com/chaos-mesh/chaos-mesh/api/v1alpha1"
    30  )
    31  
    32  var (
    33  	// ErrPodNotFound means operate pod may be deleted(almostly)
    34  	ErrPodNotFound = errors.New("pod not found")
    35  
    36  	// ErrPodNotRunning means operate pod may be not working
    37  	// and it's non-sense to make changes on it.
    38  	ErrPodNotRunning = errors.New("pod not running")
    39  )
    40  
    41  // PodIOManager will save all the related podiochaos
    42  type PodIOManager struct {
    43  	Source string
    44  
    45  	Log logr.Logger
    46  	client.Client
    47  	client.Reader
    48  	scheme *runtime.Scheme
    49  
    50  	Key types.NamespacedName
    51  	T   *PodIOTransaction
    52  }
    53  
    54  // CommitResponse is a tuple (Key, Err)
    55  type CommitResponse struct {
    56  	Key types.NamespacedName
    57  	Err error
    58  }
    59  
    60  // Commit will update all modifications to the cluster
    61  func (m *PodIOManager) Commit(ctx context.Context, owner *v1alpha1.IOChaos) (int64, error) {
    62  	m.Log.Info("running modification on pod", "key", m.Key, "modification", m.T)
    63  	updateError := retry.RetryOnConflict(retry.DefaultRetry, func() error {
    64  		chaos := &v1alpha1.PodIOChaos{}
    65  
    66  		err := m.Client.Get(ctx, m.Key, chaos)
    67  		if err != nil {
    68  			if !k8sError.IsNotFound(err) {
    69  				m.Log.Error(err, "error while getting podiochaos")
    70  				return err
    71  			}
    72  
    73  			err := m.CreateNewPodIOChaos(ctx)
    74  			if err != nil {
    75  				m.Log.Error(err, "error while creating new podiochaos")
    76  				return err
    77  			}
    78  
    79  			return nil
    80  		}
    81  
    82  		err = m.T.Apply(chaos)
    83  		if err != nil {
    84  			m.Log.Error(err, "error while applying transactions", "transaction", m.T)
    85  			return err
    86  		}
    87  
    88  		return m.Client.Update(ctx, chaos)
    89  	})
    90  	if updateError != nil {
    91  		return 0, updateError
    92  	}
    93  
    94  	chaos := &v1alpha1.PodIOChaos{}
    95  	err := m.Reader.Get(ctx, m.Key, chaos)
    96  	if err != nil {
    97  		m.Log.Error(err, "error while getting the latest generation number")
    98  		return 0, err
    99  	}
   100  	return chaos.GetGeneration(), nil
   101  }
   102  
   103  func (m *PodIOManager) CreateNewPodIOChaos(ctx context.Context) error {
   104  	var err error
   105  	chaos := &v1alpha1.PodIOChaos{}
   106  
   107  	pod := v1.Pod{}
   108  	err = m.Client.Get(ctx, m.Key, &pod)
   109  	if err != nil {
   110  		if !k8sError.IsNotFound(err) {
   111  			m.Log.Error(err, "error while finding pod")
   112  			return err
   113  		}
   114  
   115  		m.Log.Info("pod not found", "key", m.Key, "error", err.Error())
   116  		err = ErrPodNotFound
   117  		return err
   118  	}
   119  
   120  	if pod.Status.Phase != v1.PodRunning {
   121  		m.Log.Info("pod is not running", "key", m.Key)
   122  		err = ErrPodNotRunning
   123  		return err
   124  	}
   125  
   126  	chaos.Name = m.Key.Name
   127  	chaos.Namespace = m.Key.Namespace
   128  	chaos.OwnerReferences = []metav1.OwnerReference{
   129  		{
   130  			APIVersion: pod.APIVersion,
   131  			Kind:       pod.Kind,
   132  			Name:       pod.Name,
   133  			UID:        pod.UID,
   134  		},
   135  	}
   136  	err = m.T.Apply(chaos)
   137  	if err != nil {
   138  		m.Log.Error(err, "error while applying transactions", "transaction", m.T)
   139  		return err
   140  	}
   141  
   142  	return m.Client.Create(ctx, chaos)
   143  }
   144