forked from containerd/containerd
-
Notifications
You must be signed in to change notification settings - Fork 0
/
context.go
63 lines (51 loc) · 1.64 KB
/
context.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
package namespaces
import (
"os"
"github.com/containerd/containerd/errdefs"
"github.com/pkg/errors"
"golang.org/x/net/context"
)
const (
// NamespaceEnvVar is the environment variable key name
NamespaceEnvVar = "CONTAINERD_NAMESPACE"
// Default is the name of the default namespace
Default = "default"
)
type namespaceKey struct{}
// WithNamespace sets a given namespace on the context
func WithNamespace(ctx context.Context, namespace string) context.Context {
ctx = context.WithValue(ctx, namespaceKey{}, namespace) // set our key for namespace
// also store on the grpc headers so it gets picked up by any clients that
// are using this.
return withGRPCNamespaceHeader(ctx, namespace)
}
// NamespaceFromEnv uses the namespace defined in CONTAINERD_NAMESPACE or
// default
func NamespaceFromEnv(ctx context.Context) context.Context {
namespace := os.Getenv(NamespaceEnvVar)
if namespace == "" {
namespace = Default
}
return WithNamespace(ctx, namespace)
}
// Namespace returns the namespace from the context.
//
// The namespace is not guaranteed to be valid.
func Namespace(ctx context.Context) (string, bool) {
namespace, ok := ctx.Value(namespaceKey{}).(string)
if !ok {
return fromGRPCHeader(ctx)
}
return namespace, ok
}
// NamespaceRequired returns the valid namepace from the context or an error.
func NamespaceRequired(ctx context.Context) (string, error) {
namespace, ok := Namespace(ctx)
if !ok || namespace == "" {
return "", errors.Wrapf(errdefs.ErrFailedPrecondition, "namespace is required")
}
if err := Validate(namespace); err != nil {
return "", errors.Wrap(err, "namespace validation")
}
return namespace, nil
}