istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pilot/pkg/bootstrap/config_compare.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 bootstrap
    16  
    17  import (
    18  	"strings"
    19  
    20  	gogoproto "github.com/gogo/protobuf/proto" // nolint: depguard
    21  	"google.golang.org/protobuf/proto"
    22  
    23  	"istio.io/istio/pkg/config"
    24  )
    25  
    26  // needsPush checks whether the passed in config has same spec and hence push needs
    27  // to be triggered. This is to avoid unnecessary pushes only when labels have changed
    28  // for example.
    29  func needsPush(prev config.Config, curr config.Config) bool {
    30  	if prev.GroupVersionKind != curr.GroupVersionKind {
    31  		// This should never happen.
    32  		return true
    33  	}
    34  	// If the config is not Istio, let us just push.
    35  	if !strings.HasSuffix(prev.GroupVersionKind.Group, "istio.io") {
    36  		return true
    37  	}
    38  	// If current/previous metadata has "*istio.io" label/annotation, just push
    39  	for label := range curr.Meta.Labels {
    40  		if strings.Contains(label, "istio.io") {
    41  			return true
    42  		}
    43  	}
    44  	for annotation := range curr.Meta.Annotations {
    45  		if strings.Contains(annotation, "istio.io") {
    46  			return true
    47  		}
    48  	}
    49  	for label := range prev.Meta.Labels {
    50  		if strings.Contains(label, "istio.io") {
    51  			return true
    52  		}
    53  	}
    54  	for annotation := range prev.Meta.Annotations {
    55  		if strings.Contains(annotation, "istio.io") {
    56  			return true
    57  		}
    58  	}
    59  	prevspecProto, okProtoP := prev.Spec.(proto.Message)
    60  	currspecProto, okProtoC := curr.Spec.(proto.Message)
    61  	if okProtoP && okProtoC {
    62  		return !proto.Equal(prevspecProto, currspecProto)
    63  	}
    64  	prevspecGogo, okGogoP := prev.Spec.(gogoproto.Message)
    65  	currspecGogo, okGogoC := curr.Spec.(gogoproto.Message)
    66  	if okGogoP && okGogoC {
    67  		return !gogoproto.Equal(prevspecGogo, currspecGogo)
    68  	}
    69  	return true
    70  }