70 lines
1.7 KiB
Go
70 lines
1.7 KiB
Go
package namespaces
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import (
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"os"
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"github.com/pkg/errors"
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"golang.org/x/net/context"
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)
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const (
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namespaceEnvVar = "CONTAINERD_NAMESPACE"
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defaultNamespace = "default"
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)
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var (
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errNamespaceRequired = errors.New("namespace is required")
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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 = defaultNamespace
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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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// IsNamespaceRequired returns whether an error is caused by a missing namespace
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func IsNamespaceRequired(err error) bool {
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return errors.Cause(err) == errNamespaceRequired
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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 "", errNamespaceRequired
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}
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if err := Validate(namespace); err != nil {
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return "", err
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}
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return namespace, nil
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}
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