istio.io/istio@v0.0.0-20240520182934-d79c90f27776/istioctl/pkg/util/configdump/wrapper.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 configdump
    16  
    17  import (
    18  	admin "github.com/envoyproxy/go-control-plane/envoy/admin/v3"
    19  	exprpb "google.golang.org/genproto/googleapis/api/expr/v1alpha1"
    20  	"google.golang.org/protobuf/reflect/protoreflect"
    21  	"google.golang.org/protobuf/reflect/protoregistry"
    22  	"google.golang.org/protobuf/types/known/emptypb"
    23  
    24  	"istio.io/istio/pkg/util/protomarshal"
    25  )
    26  
    27  type resolver struct {
    28  	*protoregistry.Types
    29  }
    30  
    31  var nonStrictResolver = &resolver{protoregistry.GlobalTypes}
    32  
    33  func (r *resolver) FindMessageByURL(url string) (protoreflect.MessageType, error) {
    34  	typ, err := r.Types.FindMessageByURL(url)
    35  	if err != nil {
    36  		// Here we ignore the error since we want istioctl to ignore unknown types due to the Envoy version change
    37  		msg := exprpb.Type{TypeKind: &exprpb.Type_Dyn{Dyn: &emptypb.Empty{}}}
    38  		return msg.ProtoReflect().Type(), nil
    39  	}
    40  	return typ, nil
    41  }
    42  
    43  // Wrapper is a wrapper around the Envoy ConfigDump
    44  // It has extra helper functions for handling any/struct/marshal protobuf pain
    45  type Wrapper struct {
    46  	*admin.ConfigDump
    47  }
    48  
    49  // UnmarshalJSON is a custom unmarshaller to handle protobuf pain
    50  func (w *Wrapper) UnmarshalJSON(b []byte) error {
    51  	cd := &admin.ConfigDump{}
    52  	err := protomarshal.UnmarshalAllowUnknownWithAnyResolver(nonStrictResolver, b, cd)
    53  	*w = Wrapper{cd}
    54  	return err
    55  }