// NewStorageCodec assembles a storage codec for the provided storage media type, the provided serializer, and the requested
// storage and memory versions.
func NewStorageCodec(storageMediaType string, ns runtime.StorageSerializer, storageVersion, memoryVersion unversioned.GroupVersion, config storagebackend.Config) (runtime.Codec, error) {
mediaType, options, err := mime.ParseMediaType(storageMediaType)
if err != nil {
return nil, fmt.Errorf("%q is not a valid mime-type", storageMediaType)
}
serializer, ok := ns.SerializerForMediaType(mediaType, options)
if !ok {
return nil, fmt.Errorf("unable to find serializer for %q", storageMediaType)
}
s := serializer.Serializer
// etcd2 only supports string data - we must wrap any result before returning
// TODO: storagebackend should return a boolean indicating whether it supports binary data
if !serializer.EncodesAsText && (config.Type == storagebackend.StorageTypeUnset || config.Type == storagebackend.StorageTypeETCD2) {
glog.V(4).Infof("Wrapping the underlying binary storage serializer with a base64 encoding for etcd2")
s = runtime.NewBase64Serializer(s)
}
ds := recognizer.NewDecoder(s, ns.UniversalDeserializer())
encoder := ns.EncoderForVersion(s, storageVersion)
decoder := ns.DecoderToVersion(ds, memoryVersion)
if memoryVersion.Group != storageVersion.Group {
// Allow this codec to translate between groups.
if err := versioning.EnableCrossGroupEncoding(encoder, memoryVersion.Group, storageVersion.Group); err != nil {
return nil, fmt.Errorf("error setting up encoder from %v to %v: %v", memoryVersion, storageVersion, err)
}
if err := versioning.EnableCrossGroupDecoding(decoder, storageVersion.Group, memoryVersion.Group); err != nil {
return nil, fmt.Errorf("error setting up decoder from %v to %v: %v", storageVersion, memoryVersion, err)
}
}
return runtime.NewCodec(encoder, decoder), nil
}
func newEtcd(ns runtime.NegotiatedSerializer, storageGroupVersionString, memoryGroupVersionString string, etcdConfig etcdstorage.EtcdConfig) (etcdStorage storage.Interface, err error) {
if storageGroupVersionString == "" {
return etcdStorage, fmt.Errorf("storageVersion is required to create a etcd storage")
}
storageVersion, err := unversioned.ParseGroupVersion(storageGroupVersionString)
if err != nil {
return nil, fmt.Errorf("couldn't understand storage version %v: %v", storageGroupVersionString, err)
}
memoryVersion, err := unversioned.ParseGroupVersion(memoryGroupVersionString)
if err != nil {
return nil, fmt.Errorf("couldn't understand memory version %v: %v", memoryGroupVersionString, err)
}
var storageConfig etcdstorage.EtcdStorageConfig
storageConfig.Config = etcdConfig
s, ok := ns.SerializerForMediaType("application/json", nil)
if !ok {
return nil, fmt.Errorf("unable to find serializer for JSON")
}
glog.Infof("constructing etcd storage interface.\n sv: %v\n mv: %v\n", storageVersion, memoryVersion)
encoder := ns.EncoderForVersion(s, storageVersion)
decoder := ns.DecoderToVersion(s, memoryVersion)
if memoryVersion.Group != storageVersion.Group {
// Allow this codec to translate between groups.
if err = versioning.EnableCrossGroupEncoding(encoder, memoryVersion.Group, storageVersion.Group); err != nil {
return nil, fmt.Errorf("error setting up encoder for %v: %v", storageGroupVersionString, err)
}
if err = versioning.EnableCrossGroupDecoding(decoder, storageVersion.Group, memoryVersion.Group); err != nil {
return nil, fmt.Errorf("error setting up decoder for %v: %v", storageGroupVersionString, err)
}
}
storageConfig.Codec = runtime.NewCodec(encoder, decoder)
return storageConfig.NewStorage()
}
func newEtcd(ns runtime.NegotiatedSerializer, storageVersion, memoryVersion unversioned.GroupVersion, config storagebackend.Config) (etcdStorage storage.Interface, err error) {
s, ok := ns.SerializerForMediaType("application/json", nil)
if !ok {
return nil, fmt.Errorf("unable to find serializer for JSON")
}
encoder := ns.EncoderForVersion(s, storageVersion)
decoder := ns.DecoderToVersion(s, memoryVersion)
if memoryVersion.Group != storageVersion.Group {
// Allow this codec to translate between groups.
if err = versioning.EnableCrossGroupEncoding(encoder, memoryVersion.Group, storageVersion.Group); err != nil {
return nil, fmt.Errorf("error setting up encoder from %v to %v: %v", memoryVersion, storageVersion, err)
}
if err = versioning.EnableCrossGroupDecoding(decoder, storageVersion.Group, memoryVersion.Group); err != nil {
return nil, fmt.Errorf("error setting up decoder from %v to %v: %v", storageVersion, memoryVersion, err)
}
}
config.Codec = runtime.NewCodec(encoder, decoder)
return storagebackend.Create(config)
}