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102 lines
3.5 KiB
Go
102 lines
3.5 KiB
Go
/*
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Copyright 2014 Google Inc. All rights reserved.
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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 rest
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import (
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/util/fielderrors"
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)
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// RESTCreateStrategy defines the minimum validation, accepted input, and
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// name generation behavior to create an object that follows Kubernetes
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// API conventions.
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type RESTCreateStrategy interface {
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runtime.ObjectTyper
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// The name generate is used when the standard GenerateName field is set.
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// The NameGenerator will be invoked prior to validation.
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api.NameGenerator
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// NamespaceScoped returns true if the object must be within a namespace.
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NamespaceScoped() bool
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// ResetBeforeCreate is invoked on create before validation to remove any fields
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// that may not be persisted.
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ResetBeforeCreate(obj runtime.Object)
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// Validate is invoked after default fields in the object have been filled in before
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// the object is persisted.
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Validate(obj runtime.Object) fielderrors.ValidationErrorList
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}
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// BeforeCreate ensures that common operations for all resources are performed on creation. It only returns
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// errors that can be converted to api.Status. It invokes ResetBeforeCreate, then GenerateName, then Validate.
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// It returns nil if the object should be created.
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func BeforeCreate(strategy RESTCreateStrategy, ctx api.Context, obj runtime.Object) error {
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objectMeta, kind, kerr := objectMetaAndKind(strategy, obj)
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if kerr != nil {
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return kerr
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}
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if strategy.NamespaceScoped() {
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if !api.ValidNamespace(ctx, objectMeta) {
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return errors.NewBadRequest("the namespace of the provided object does not match the namespace sent on the request")
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}
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} else {
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objectMeta.Namespace = api.NamespaceNone
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}
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strategy.ResetBeforeCreate(obj)
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api.FillObjectMetaSystemFields(ctx, objectMeta)
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api.GenerateName(strategy, objectMeta)
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if errs := strategy.Validate(obj); len(errs) > 0 {
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return errors.NewInvalid(kind, objectMeta.Name, errs)
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}
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return nil
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}
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// CheckGeneratedNameError checks whether an error that occurred creating a resource is due
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// to generation being unable to pick a valid name.
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func CheckGeneratedNameError(strategy RESTCreateStrategy, err error, obj runtime.Object) error {
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if !errors.IsAlreadyExists(err) {
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return err
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}
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objectMeta, kind, kerr := objectMetaAndKind(strategy, obj)
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if kerr != nil {
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return kerr
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}
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if len(objectMeta.GenerateName) == 0 {
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return err
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}
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return errors.NewServerTimeout(kind, "POST")
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}
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// objectMetaAndKind retrieves kind and ObjectMeta from a runtime object, or returns an error.
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func objectMetaAndKind(typer runtime.ObjectTyper, obj runtime.Object) (*api.ObjectMeta, string, error) {
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objectMeta, err := api.ObjectMetaFor(obj)
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if err != nil {
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return nil, "", errors.NewInternalError(err)
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}
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_, kind, err := typer.ObjectVersionAndKind(obj)
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if err != nil {
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return nil, "", errors.NewInternalError(err)
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}
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return objectMeta, kind, nil
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}
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