podiochaosmanager.go

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

     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 podiochaosmanager
    17  
    18  import (
    19  	"context"
    20  
    21  	"github.com/go-logr/logr"
    22  	"github.com/pkg/errors"
    23  	v1 "k8s.io/api/core/v1"
    24  	k8sError "k8s.io/apimachinery/pkg/api/errors"
    25  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    26  	"k8s.io/apimachinery/pkg/runtime"
    27  	"k8s.io/apimachinery/pkg/types"
    28  	"k8s.io/client-go/util/retry"
    29  	"sigs.k8s.io/controller-runtime/pkg/client"
    30  
    31  	"github.com/chaos-mesh/chaos-mesh/api/v1alpha1"
    32  )
    33  
    34  var (
    35  	// ErrPodNotFound means operate pod may be deleted(almostly)
    36  	ErrPodNotFound = errors.New("pod not found")
    37  
    38  	// ErrPodNotRunning means operate pod may be not working
    39  	// and it's non-sense to make changes on it.
    40  	ErrPodNotRunning = errors.New("pod not running")
    41  )
    42  
    43  // PodIOManager will save all the related podiochaos
    44  type PodIOManager struct {
    45  	Source string
    46  
    47  	Log logr.Logger
    48  	client.Client
    49  	client.Reader
    50  	scheme *runtime.Scheme
    51  
    52  	Key types.NamespacedName
    53  	T   *PodIOTransaction
    54  }
    55  
    56  // CommitResponse is a tuple (Key, Err)
    57  type CommitResponse struct {
    58  	Key types.NamespacedName
    59  	Err error
    60  }
    61  
    62  // Commit will update all modifications to the cluster
    63  func (m *PodIOManager) Commit(ctx context.Context, owner *v1alpha1.IOChaos) (int64, error) {
    64  	m.Log.Info("running modification on pod", "key", m.Key, "modification", m.T)
    65  	updateError := retry.RetryOnConflict(retry.DefaultRetry, func() error {
    66  		chaos := &v1alpha1.PodIOChaos{}
    67  
    68  		err := m.Client.Get(ctx, m.Key, chaos)
    69  		if err != nil {
    70  			if !k8sError.IsNotFound(err) {
    71  				m.Log.Error(err, "error while getting podiochaos")
    72  				return err
    73  			}
    74  
    75  			err := m.CreateNewPodIOChaos(ctx)
    76  			if err != nil {
    77  				m.Log.Error(err, "error while creating new podiochaos")
    78  				return err
    79  			}
    80  
    81  			return nil
    82  		}
    83  
    84  		err = m.T.Apply(chaos)
    85  		if err != nil {
    86  			m.Log.Error(err, "error while applying transactions", "transaction", m.T)
    87  			return err
    88  		}
    89  
    90  		return m.Client.Update(ctx, chaos)
    91  	})
    92  	if updateError != nil {
    93  		return 0, updateError
    94  	}
    95  
    96  	chaos := &v1alpha1.PodIOChaos{}
    97  	err := m.Reader.Get(ctx, m.Key, chaos)
    98  	if err != nil {
    99  		m.Log.Error(err, "error while getting the latest generation number")
   100  		return 0, err
   101  	}
   102  	return chaos.GetGeneration(), nil
   103  }
   104  
   105  func (m *PodIOManager) CreateNewPodIOChaos(ctx context.Context) error {
   106  	var err error
   107  	chaos := &v1alpha1.PodIOChaos{}
   108  
   109  	pod := v1.Pod{}
   110  	err = m.Client.Get(ctx, m.Key, &pod)
   111  	if err != nil {
   112  		if !k8sError.IsNotFound(err) {
   113  			m.Log.Error(err, "error while finding pod")
   114  			return err
   115  		}
   116  
   117  		m.Log.Info("pod not found", "key", m.Key, "error", err.Error())
   118  		err = ErrPodNotFound
   119  		return err
   120  	}
   121  
   122  	if pod.Status.Phase != v1.PodRunning {
   123  		m.Log.Info("pod is not running", "key", m.Key)
   124  		err = ErrPodNotRunning
   125  		return err
   126  	}
   127  
   128  	chaos.Name = m.Key.Name
   129  	chaos.Namespace = m.Key.Namespace
   130  	chaos.OwnerReferences = []metav1.OwnerReference{
   131  		{
   132  			APIVersion: pod.APIVersion,
   133  			Kind:       pod.Kind,
   134  			Name:       pod.Name,
   135  			UID:        pod.UID,
   136  		},
   137  	}
   138  	err = m.T.Apply(chaos)
   139  	if err != nil {
   140  		m.Log.Error(err, "error while applying transactions", "transaction", m.T)
   141  		return err
   142  	}
   143  
   144  	return m.Client.Create(ctx, chaos)
   145  }
   146