mirror of
https://github.com/k3s-io/kubernetes.git
synced 2025-10-31 05:40:42 +00:00
122 lines
3.9 KiB
Go
122 lines
3.9 KiB
Go
/*
|
|
Copyright 2014 The Kubernetes Authors All rights reserved.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package api
|
|
|
|
import (
|
|
stderrs "errors"
|
|
"time"
|
|
|
|
"golang.org/x/net/context"
|
|
"k8s.io/kubernetes/pkg/auth/user"
|
|
)
|
|
|
|
// Context carries values across API boundaries.
|
|
// This context matches the context.Context interface
|
|
// (https://blog.golang.org/context), for the purposes
|
|
// of passing the api.Context through to the storage tier.
|
|
// TODO: Determine the extent that this abstraction+interface
|
|
// is used by the api, and whether we can remove.
|
|
type Context interface {
|
|
// Value returns the value associated with key or nil if none.
|
|
Value(key interface{}) interface{}
|
|
|
|
// Deadline returns the time when this Context will be canceled, if any.
|
|
Deadline() (deadline time.Time, ok bool)
|
|
|
|
// Done returns a channel that is closed when this Context is canceled
|
|
// or times out.
|
|
Done() <-chan struct{}
|
|
|
|
// Err indicates why this context was canceled, after the Done channel
|
|
// is closed.
|
|
Err() error
|
|
}
|
|
|
|
// The key type is unexported to prevent collisions
|
|
type key int
|
|
|
|
// namespaceKey is the context key for the request namespace.
|
|
const namespaceKey key = 0
|
|
|
|
// userKey is the context key for the request user.
|
|
const userKey key = 1
|
|
|
|
// NewContext instantiates a base context object for request flows.
|
|
func NewContext() Context {
|
|
return context.TODO()
|
|
}
|
|
|
|
// NewDefaultContext instantiates a base context object for request flows in the default namespace
|
|
func NewDefaultContext() Context {
|
|
return WithNamespace(NewContext(), NamespaceDefault)
|
|
}
|
|
|
|
// WithValue returns a copy of parent in which the value associated with key is val.
|
|
func WithValue(parent Context, key interface{}, val interface{}) Context {
|
|
internalCtx, ok := parent.(context.Context)
|
|
if !ok {
|
|
panic(stderrs.New("Invalid context type"))
|
|
}
|
|
return context.WithValue(internalCtx, key, val)
|
|
}
|
|
|
|
// WithNamespace returns a copy of parent in which the namespace value is set
|
|
func WithNamespace(parent Context, namespace string) Context {
|
|
return WithValue(parent, namespaceKey, namespace)
|
|
}
|
|
|
|
// NamespaceFrom returns the value of the namespace key on the ctx
|
|
func NamespaceFrom(ctx Context) (string, bool) {
|
|
namespace, ok := ctx.Value(namespaceKey).(string)
|
|
return namespace, ok
|
|
}
|
|
|
|
// NamespaceValue returns the value of the namespace key on the ctx, or the empty string if none
|
|
func NamespaceValue(ctx Context) string {
|
|
namespace, _ := NamespaceFrom(ctx)
|
|
return namespace
|
|
}
|
|
|
|
// ValidNamespace returns false if the namespace on the context differs from the resource. If the resource has no namespace, it is set to the value in the context.
|
|
func ValidNamespace(ctx Context, resource *ObjectMeta) bool {
|
|
ns, ok := NamespaceFrom(ctx)
|
|
if len(resource.Namespace) == 0 {
|
|
resource.Namespace = ns
|
|
}
|
|
return ns == resource.Namespace && ok
|
|
}
|
|
|
|
// WithNamespaceDefaultIfNone returns a context whose namespace is the default if and only if the parent context has no namespace value
|
|
func WithNamespaceDefaultIfNone(parent Context) Context {
|
|
namespace, ok := NamespaceFrom(parent)
|
|
if !ok || len(namespace) == 0 {
|
|
return WithNamespace(parent, NamespaceDefault)
|
|
}
|
|
return parent
|
|
}
|
|
|
|
// WithUser returns a copy of parent in which the user value is set
|
|
func WithUser(parent Context, user user.Info) Context {
|
|
return WithValue(parent, userKey, user)
|
|
}
|
|
|
|
// UserFrom returns the value of the user key on the ctx
|
|
func UserFrom(ctx Context) (user.Info, bool) {
|
|
user, ok := ctx.Value(userKey).(user.Info)
|
|
return user, ok
|
|
}
|