61 lines
1.7 KiB
Go
61 lines
1.7 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package namespaces
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import (
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"golang.org/x/net/context"
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"google.golang.org/grpc/metadata"
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)
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const (
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// GRPCHeader defines the header name for specifying a containerd namespace.
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GRPCHeader = "containerd-namespace"
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)
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// NOTE(stevvooe): We can stub this file out if we don't want a grpc dependency here.
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func withGRPCNamespaceHeader(ctx context.Context, namespace string) context.Context {
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// also store on the grpc headers so it gets picked up by any clients that
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// are using this.
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nsheader := metadata.Pairs(GRPCHeader, namespace)
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md, ok := metadata.FromOutgoingContext(ctx) // merge with outgoing context.
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if !ok {
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md = nsheader
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} else {
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// order ensures the latest is first in this list.
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md = metadata.Join(nsheader, md)
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}
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return metadata.NewOutgoingContext(ctx, md)
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}
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func fromGRPCHeader(ctx context.Context) (string, bool) {
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// try to extract for use in grpc servers.
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md, ok := metadata.FromIncomingContext(ctx)
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if !ok {
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// TODO(stevvooe): Check outgoing context?
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return "", false
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}
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values := md[GRPCHeader]
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if len(values) == 0 {
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return "", false
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}
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return values[0], true
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}
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