80 lines
2.2 KiB
Go
80 lines
2.2 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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"os"
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"github.com/containerd/containerd/errdefs"
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"github.com/pkg/errors"
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)
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const (
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// NamespaceEnvVar is the environment variable key name
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NamespaceEnvVar = "CONTAINERD_NAMESPACE"
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// Default is the name of the default namespace
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Default = "default"
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)
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type namespaceKey struct{}
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// WithNamespace sets a given namespace on the context
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func WithNamespace(ctx context.Context, namespace string) context.Context {
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ctx = context.WithValue(ctx, namespaceKey{}, namespace) // set our key for namespace
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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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return withGRPCNamespaceHeader(ctx, namespace)
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}
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// NamespaceFromEnv uses the namespace defined in CONTAINERD_NAMESPACE or
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// default
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func NamespaceFromEnv(ctx context.Context) context.Context {
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namespace := os.Getenv(NamespaceEnvVar)
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if namespace == "" {
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namespace = Default
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}
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return WithNamespace(ctx, namespace)
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}
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// Namespace returns the namespace from the context.
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//
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// The namespace is not guaranteed to be valid.
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func Namespace(ctx context.Context) (string, bool) {
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namespace, ok := ctx.Value(namespaceKey{}).(string)
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if !ok {
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return fromGRPCHeader(ctx)
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}
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return namespace, ok
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}
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// NamespaceRequired returns the valid namepace from the context or an error.
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func NamespaceRequired(ctx context.Context) (string, error) {
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namespace, ok := Namespace(ctx)
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if !ok || namespace == "" {
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return "", errors.Wrapf(errdefs.ErrFailedPrecondition, "namespace is required")
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}
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if err := Validate(namespace); err != nil {
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return "", errors.Wrap(err, "namespace validation")
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}
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return namespace, nil
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}
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