selector.go

Documentation: github.com/chaos-mesh/chaos-mesh/pkg/selector/generic/namespace

     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 namespace
    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  	"k8s.io/apimachinery/pkg/types"
    25  	"sigs.k8s.io/controller-runtime/pkg/client"
    26  
    27  	"github.com/chaos-mesh/chaos-mesh/api/v1alpha1"
    28  	"github.com/chaos-mesh/chaos-mesh/pkg/selector/generic"
    29  )
    30  
    31  const Name = "namespace"
    32  
    33  type namespaceSelector struct {
    34  	generic.Option
    35  	namespaces []string
    36  }
    37  
    38  var _ generic.Selector = &namespaceSelector{}
    39  
    40  func (s *namespaceSelector) ListOption() client.ListOption {
    41  	if !s.ClusterScoped {
    42  		return client.InNamespace(s.TargetNamespace)
    43  	}
    44  	return nil
    45  }
    46  
    47  func (s *namespaceSelector) ListFunc(_ client.Reader) generic.ListFunc {
    48  	return nil
    49  }
    50  
    51  func (s *namespaceSelector) Match(obj client.Object) bool {
    52  	if len(s.namespaces) == 0 {
    53  		return true
    54  	}
    55  
    56  	for _, namespace := range s.namespaces {
    57  		if namespace == obj.GetNamespace() {
    58  			return true
    59  		}
    60  	}
    61  	return false
    62  }
    63  
    64  func New(spec v1alpha1.GenericSelectorSpec, option generic.Option) (generic.Selector, error) {
    65  	if !option.ClusterScoped {
    66  		if len(spec.Namespaces) > 1 {
    67  			return nil, errors.New("could NOT use more than 1 namespace selector within namespace scoped mode")
    68  		} else if len(spec.Namespaces) == 1 {
    69  			if spec.Namespaces[0] != option.TargetNamespace {
    70  				return nil, errors.Errorf("could NOT list pods from out of scoped namespace: %s", spec.Namespaces[0])
    71  			}
    72  		}
    73  	}
    74  
    75  	return &namespaceSelector{
    76  		Option: generic.Option{
    77  			ClusterScoped:         option.ClusterScoped,
    78  			TargetNamespace:       option.TargetNamespace,
    79  			EnableFilterNamespace: option.EnableFilterNamespace,
    80  		},
    81  		namespaces: spec.Namespaces,
    82  	}, nil
    83  }
    84  
    85  func CheckNamespace(ctx context.Context, c client.Client, namespace string, logger logr.Logger) bool {
    86  	ok, err := IsAllowedNamespaces(ctx, c, namespace)
    87  	if err != nil {
    88  		logger.Error(err, "fail to check whether this namespace is allowed", "namespace", namespace)
    89  		return false
    90  	}
    91  
    92  	if !ok {
    93  		logger.Info("namespace is not enabled for chaos-mesh", "namespace", namespace)
    94  	}
    95  	return ok
    96  }
    97  
    98  func IsAllowedNamespaces(ctx context.Context, c client.Client, namespace string) (bool, error) {
    99  	ns := &v1.Namespace{}
   100  
   101  	err := c.Get(ctx, types.NamespacedName{Name: namespace}, ns)
   102  	if err != nil {
   103  		return false, err
   104  	}
   105  
   106  	if ns.Annotations[generic.InjectAnnotationKey] == "enabled" {
   107  		return true, nil
   108  	}
   109  
   110  	return false, nil
   111  }
   112