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58 lines
1.5 KiB
58 lines
1.5 KiB
/*
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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 leases
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import (
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"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 lease.
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GRPCHeader = "containerd-lease"
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)
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func withGRPCLeaseHeader(ctx context.Context, lid string) context.Context {
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// also store on the grpc headers so it gets picked up by any clients
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// that are using this.
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txheader := metadata.Pairs(GRPCHeader, lid)
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md, ok := metadata.FromOutgoingContext(ctx) // merge with outgoing context.
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if !ok {
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md = txheader
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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(txheader, 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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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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