istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pilot/pkg/serviceregistry/util/workloadinstances/selector.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 workloadinstances
    16  
    17  import (
    18  	"istio.io/istio/pilot/pkg/model"
    19  	"istio.io/istio/pkg/config/labels"
    20  )
    21  
    22  // ByServiceSelector returns a predicate that matches workload instances
    23  // of a given service.
    24  func ByServiceSelector(namespace string, selector labels.Instance) func(*model.WorkloadInstance) bool {
    25  	return func(wi *model.WorkloadInstance) bool {
    26  		return wi.Namespace == namespace && selector.Match(wi.Endpoint.Labels)
    27  	}
    28  }
    29  
    30  // FindAllInIndex returns a list of workload instances in the index
    31  // that match given predicate.
    32  //
    33  // The returned list is not ordered.
    34  func FindAllInIndex(index Index, predicate func(*model.WorkloadInstance) bool) []*model.WorkloadInstance {
    35  	var instances []*model.WorkloadInstance
    36  	index.ForEach(func(instance *model.WorkloadInstance) {
    37  		if predicate(instance) {
    38  			instances = append(instances, instance)
    39  		}
    40  	})
    41  	return instances
    42  }