Source: metadata.go in package google.golang.org/grpc/internal/grpcutil

Source File
	metadata.go

Belonging Package
	google.golang.org/grpc/internal/grpcutil

* * Copyright 2020 gRPC authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http:www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *


package grpcutil

import (
	"context"

	"google.golang.org/grpc/metadata"
)

type mdExtraKey struct{}

WithExtraMetadata creates a new context with incoming md attached.

func WithExtraMetadata(ctx context.Context, md metadata.MD) context.Context {
	return context.WithValue(ctx, mdExtraKey{}, md)
}

ExtraMetadata returns the incoming metadata in ctx if it exists. The returned MD should not be modified. Writing to it may cause races. Modification should be made to copies of the returned MD.

func ExtraMetadata(ctx context.Context) (md metadata.MD, ok bool) {
	md, ok = ctx.Value(mdExtraKey{}).(metadata.MD)
	return


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