istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pilot/pkg/serviceregistry/serviceentry/util.go (about)

     1  // Copyright Istio 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  package serviceentry
    16  
    17  import (
    18  	"k8s.io/apimachinery/pkg/types"
    19  
    20  	networking "istio.io/api/networking/v1alpha3"
    21  	"istio.io/istio/pkg/config"
    22  	"istio.io/istio/pkg/config/labels"
    23  )
    24  
    25  func getWorkloadServiceEntries(ses []config.Config, wle *networking.WorkloadEntry) map[types.NamespacedName]*config.Config {
    26  	out := make(map[types.NamespacedName]*config.Config)
    27  	for i, cfg := range ses {
    28  		se := cfg.Spec.(*networking.ServiceEntry)
    29  		if se.WorkloadSelector != nil && labels.Instance(se.WorkloadSelector.Labels).Match(wle.Labels) {
    30  			out[cfg.NamespacedName()] = &ses[i]
    31  		}
    32  	}
    33  
    34  	return out
    35  }
    36  
    37  // returns a set of objects that are in `old` but not in `curr`
    38  // For example:
    39  // old = {a1, a2, a3}
    40  // curr = {a1, a2, a4, a5}
    41  // difference(old, curr) = {a3}
    42  func difference(old, curr map[types.NamespacedName]*config.Config) []types.NamespacedName {
    43  	var out []types.NamespacedName
    44  	for key := range old {
    45  		if _, ok := curr[key]; !ok {
    46  			out = append(out, key)
    47  		}
    48  	}
    49  
    50  	return out
    51  }