conversion.go

/*
Copyright 2014 Google Inc. 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 (
	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/resource"
	"github.com/GoogleCloudPlatform/kubernetes/pkg/conversion"
	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
)

// Codec is the identity codec for this package - it can only convert itself
// to itself.
var Codec = runtime.CodecFor(Scheme, "")

func init() {
	Scheme.AddConversionFuncs(
		func(in *util.Time, out *util.Time, s conversion.Scope) error {
			// Cannot deep copy these, because time.Time has unexported fields.
			*out = *in
			return nil
		},
		func(in *resource.Quantity, out *resource.Quantity, s conversion.Scope) error {
			// Cannot deep copy these, because inf.Dec has unexported fields.
			*out = *in.Copy()
			return nil
		},
		// Convert ContainerManifest to BoundPod
		func(in *ContainerManifest, out *BoundPod, s conversion.Scope) error {
			out.Spec.Containers = in.Containers
			out.Spec.Volumes = in.Volumes
			out.Spec.RestartPolicy = in.RestartPolicy
			out.Spec.DNSPolicy = in.DNSPolicy
			out.Name = in.ID
			out.UID = in.UUID
			// TODO(dchen1107): Move this conversion to pkg/api/v1beta[123]/conversion.go
			// along with fixing #1502
			for i := range out.Spec.Containers {
				ctr := &out.Spec.Containers[i]
				if len(ctr.TerminationMessagePath) == 0 {
					ctr.TerminationMessagePath = TerminationMessagePathDefault
				}
			}
			return nil
		},
		func(in *BoundPod, out *ContainerManifest, s conversion.Scope) error {
			out.Containers = in.Spec.Containers
			out.Volumes = in.Spec.Volumes
			out.RestartPolicy = in.Spec.RestartPolicy
			out.DNSPolicy = in.Spec.DNSPolicy
			out.Version = "v1beta2"
			out.ID = in.Name
			out.UUID = in.UID
			for i := range out.Containers {
				ctr := &out.Containers[i]
				if len(ctr.TerminationMessagePath) == 0 {
					ctr.TerminationMessagePath = TerminationMessagePathDefault
				}
			}
			return nil
		},

		// ContainerManifestList
		func(in *ContainerManifestList, out *BoundPods, s conversion.Scope) error {
			if err := s.Convert(&in.Items, &out.Items, 0); err != nil {
				return err
			}
			for i := range out.Items {
				item := &out.Items[i]
				item.ResourceVersion = in.ResourceVersion
			}
			return nil
		},
		func(in *BoundPods, out *ContainerManifestList, s conversion.Scope) error {
			if err := s.Convert(&in.Items, &out.Items, 0); err != nil {
				return err
			}
			out.ResourceVersion = in.ResourceVersion
			return nil
		},

		// Convert Pod to BoundPod
		func(in *Pod, out *BoundPod, s conversion.Scope) error {
			if err := s.Convert(&in.Spec, &out.Spec, 0); err != nil {
				return err
			}
			// Only copy a subset of fields, and override manifest attributes with the pod
			// metadata
			out.UID = in.UID
			out.Name = in.Name
			out.Namespace = in.Namespace
			out.CreationTimestamp = in.CreationTimestamp
			return nil
		},

		// Conversion between Manifest and PodSpec
		func(in *PodSpec, out *ContainerManifest, s conversion.Scope) error {
			if err := s.Convert(&in.Volumes, &out.Volumes, 0); err != nil {
				return err
			}
			if err := s.Convert(&in.Containers, &out.Containers, 0); err != nil {
				return err
			}
			if err := s.Convert(&in.RestartPolicy, &out.RestartPolicy, 0); err != nil {
				return err
			}
			out.DNSPolicy = in.DNSPolicy
			out.Version = "v1beta2"
			return nil
		},
		func(in *ContainerManifest, out *PodSpec, s conversion.Scope) error {
			if err := s.Convert(&in.Volumes, &out.Volumes, 0); err != nil {
				return err
			}
			if err := s.Convert(&in.Containers, &out.Containers, 0); err != nil {
				return err
			}
			if err := s.Convert(&in.RestartPolicy, &out.RestartPolicy, 0); err != nil {
				return err
			}
			out.DNSPolicy = in.DNSPolicy
			return nil
		},
	)
}