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grpc.go
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grpc.go
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package namespaces
import (
"golang.org/x/net/context"
"google.golang.org/grpc/metadata"
)
const (
// GRPCHeader defines the header name for specifying a containerd namespace.
GRPCHeader = "containerd-namespace"
)
// NOTE(stevvooe): We can stub this file out if we don't want a grpc dependency here.
func withGRPCNamespaceHeader(ctx context.Context, namespace string) context.Context {
// also store on the grpc headers so it gets picked up by any clients that
// are using this.
nsheader := metadata.Pairs(GRPCHeader, namespace)
md, ok := metadata.FromOutgoingContext(ctx) // merge with outgoing context.
if !ok {
md = nsheader
} else {
// order ensures the latest is first in this list.
md = metadata.Join(nsheader, md)
}
return metadata.NewOutgoingContext(ctx, md)
}
func fromGRPCHeader(ctx context.Context) (string, bool) {
// try to extract for use in grpc servers.
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
// TODO(stevvooe): Check outgoing context?
return "", false
}
values := md[GRPCHeader]
if len(values) == 0 {
return "", false
}
return values[0], true
}