gtsocial-umbx

Unnamed repository; edit this file 'description' to name the repository.
Log | Files | Refs | README | LICENSE

metadata.go (1237B)

      1 /*
      2  *
      3  * Copyright 2020 gRPC authors.
      4  *
      5  * Licensed under the Apache License, Version 2.0 (the "License");
      6  * you may not use this file except in compliance with the License.
      7  * You may obtain a copy of the License at
      8  *
      9  *     http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  * Unless required by applicable law or agreed to in writing, software
     12  * distributed under the License is distributed on an "AS IS" BASIS,
     13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  * See the License for the specific language governing permissions and
     15  * limitations under the License.
     16  *
     17  */
     18 
     19 package grpcutil
     20 
     21 import (
     22 	"context"
     23 
     24 	"google.golang.org/grpc/metadata"
     25 )
     26 
     27 type mdExtraKey struct{}
     28 
     29 // WithExtraMetadata creates a new context with incoming md attached.
     30 func WithExtraMetadata(ctx context.Context, md metadata.MD) context.Context {
     31 	return context.WithValue(ctx, mdExtraKey{}, md)
     32 }
     33 
     34 // ExtraMetadata returns the incoming metadata in ctx if it exists.  The
     35 // returned MD should not be modified. Writing to it may cause races.
     36 // Modification should be made to copies of the returned MD.
     37 func ExtraMetadata(ctx context.Context) (md metadata.MD, ok bool) {
     38 	md, ok = ctx.Value(mdExtraKey{}).(metadata.MD)
     39 	return
     40 }