a3a30635ef
If there are multiple goroutines calling `namespace.WithNamespace` on a ctx that already had namespace, there will be a data race when `withTTRPCNamespaceHeader` calling `MD.Set()`. So we have to copy the md before using it. Signed-off-by: Li Yuxuan <liyuxuan04@baidu.com>
52 lines
1.3 KiB
Go
52 lines
1.3 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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"context"
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"github.com/containerd/ttrpc"
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)
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const (
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// TTRPCHeader defines the header name for specifying a containerd namespace
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TTRPCHeader = "containerd-namespace-ttrpc"
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)
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func copyMetadata(src ttrpc.MD) ttrpc.MD {
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md := ttrpc.MD{}
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for k, v := range src {
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md[k] = append(md[k], v...)
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}
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return md
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}
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func withTTRPCNamespaceHeader(ctx context.Context, namespace string) context.Context {
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md, ok := ttrpc.GetMetadata(ctx)
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if !ok {
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md = ttrpc.MD{}
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} else {
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md = copyMetadata(md)
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}
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md.Set(TTRPCHeader, namespace)
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return ttrpc.WithMetadata(ctx, md)
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}
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func fromTTRPCHeader(ctx context.Context) (string, bool) {
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return ttrpc.GetMetadataValue(ctx, TTRPCHeader)
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}
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