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/*
Copyright 2014 The Kubernetes Authors.
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 runtime
import (
"io"
"net/url"
"k8s.io/client-go/pkg/api/unversioned"
)
const (
// APIVersionInternal may be used if you are registering a type that should not
// be considered stable or serialized - it is a convention only and has no
// special behavior in this package.
APIVersionInternal = "__internal"
)
// GroupVersioner refines a set of possible conversion targets into a single option.
type GroupVersioner interface {
// KindForGroupVersionKinds returns a desired target group version kind for the given input, or returns ok false if no
// target is known. In general, if the return target is not in the input list, the caller is expected to invoke
// Scheme.New(target) and then perform a conversion between the current Go type and the destination Go type.
// Sophisticated implementations may use additional information about the input kinds to pick a destination kind.
KindForGroupVersionKinds(kinds []unversioned.GroupVersionKind) (target unversioned.GroupVersionKind, ok bool)
}
// Encoders write objects to a serialized form
type Encoder interface {
// Encode writes an object to a stream. Implementations may return errors if the versions are
// incompatible, or if no conversion is defined.
Encode(obj Object, w io.Writer) error
}
// Decoders attempt to load an object from data.
type Decoder interface {
// Decode attempts to deserialize the provided data using either the innate typing of the scheme or the
// default kind, group, and version provided. It returns a decoded object as well as the kind, group, and
// version from the serialized data, or an error. If into is non-nil, it will be used as the target type
// and implementations may choose to use it rather than reallocating an object. However, the object is not
// guaranteed to be populated. The returned object is not guaranteed to match into. If defaults are
// provided, they are applied to the data by default. If no defaults or partial defaults are provided, the
// type of the into may be used to guide conversion decisions.
Decode(data []byte, defaults *unversioned.GroupVersionKind, into Object) (Object, *unversioned.GroupVersionKind, error)
}
// Serializer is the core interface for transforming objects into a serialized format and back.
// Implementations may choose to perform conversion of the object, but no assumptions should be made.
type Serializer interface {
Encoder
Decoder
}
// Codec is a Serializer that deals with the details of versioning objects. It offers the same
// interface as Serializer, so this is a marker to consumers that care about the version of the objects
// they receive.
type Codec Serializer
// ParameterCodec defines methods for serializing and deserializing API objects to url.Values and
// performing any necessary conversion. Unlike the normal Codec, query parameters are not self describing
// and the desired version must be specified.
type ParameterCodec interface {
// DecodeParameters takes the given url.Values in the specified group version and decodes them
// into the provided object, or returns an error.
DecodeParameters(parameters url.Values, from unversioned.GroupVersion, into Object) error
// EncodeParameters encodes the provided object as query parameters or returns an error.
EncodeParameters(obj Object, to unversioned.GroupVersion) (url.Values, error)
}
// Framer is a factory for creating readers and writers that obey a particular framing pattern.
type Framer interface {
NewFrameReader(r io.ReadCloser) io.ReadCloser
NewFrameWriter(w io.Writer) io.Writer
}
// SerializerInfo contains information about a specific serialization format
type SerializerInfo struct {
// MediaType is the value that represents this serializer over the wire.
MediaType string
// EncodesAsText indicates this serializer can be encoded to UTF-8 safely.
EncodesAsText bool
// Serializer is the individual object serializer for this media type.
Serializer Serializer
// PrettySerializer, if set, can serialize this object in a form biased towards
// readability.
PrettySerializer Serializer
// StreamSerializer, if set, describes the streaming serialization format
// for this media type.
StreamSerializer *StreamSerializerInfo
}
// StreamSerializerInfo contains information about a specific stream serialization format
type StreamSerializerInfo struct {
// EncodesAsText indicates this serializer can be encoded to UTF-8 safely.
EncodesAsText bool
// Serializer is the top level object serializer for this type when streaming
Serializer
// Framer is the factory for retrieving streams that separate objects on the wire
Framer
}
// NegotiatedSerializer is an interface used for obtaining encoders, decoders, and serializers
// for multiple supported media types. This would commonly be accepted by a server component
// that performs HTTP content negotiation to accept multiple formats.
type NegotiatedSerializer interface {
// SupportedMediaTypes is the media types supported for reading and writing single objects.
SupportedMediaTypes() []SerializerInfo
// EncoderForVersion returns an encoder that ensures objects being written to the provided
// serializer are in the provided group version.
EncoderForVersion(serializer Encoder, gv GroupVersioner) Encoder
// DecoderForVersion returns a decoder that ensures objects being read by the provided
// serializer are in the provided group version by default.
DecoderToVersion(serializer Decoder, gv GroupVersioner) Decoder
}
// StorageSerializer is an interface used for obtaining encoders, decoders, and serializers
// that can read and write data at rest. This would commonly be used by client tools that must
// read files, or server side storage interfaces that persist restful objects.
type StorageSerializer interface {
// SupportedMediaTypes are the media types supported for reading and writing objects.
SupportedMediaTypes() []SerializerInfo
// UniversalDeserializer returns a Serializer that can read objects in multiple supported formats
// by introspecting the data at rest.
UniversalDeserializer() Decoder
// EncoderForVersion returns an encoder that ensures objects being written to the provided
// serializer are in the provided group version.
EncoderForVersion(serializer Encoder, gv GroupVersioner) Encoder
// DecoderForVersion returns a decoder that ensures objects being read by the provided
// serializer are in the provided group version by default.
DecoderToVersion(serializer Decoder, gv GroupVersioner) Decoder
}
// NestedObjectEncoder is an optional interface that objects may implement to be given
// an opportunity to encode any nested Objects / RawExtensions during serialization.
type NestedObjectEncoder interface {
EncodeNestedObjects(e Encoder) error
}
// NestedObjectDecoder is an optional interface that objects may implement to be given
// an opportunity to decode any nested Objects / RawExtensions during serialization.
type NestedObjectDecoder interface {
DecodeNestedObjects(d Decoder) error
}
///////////////////////////////////////////////////////////////////////////////
// Non-codec interfaces
type ObjectDefaulter interface {
// Default takes an object (must be a pointer) and applies any default values.
// Defaulters may not error.
Default(in Object)
}
type ObjectVersioner interface {
ConvertToVersion(in Object, gv GroupVersioner) (out Object, err error)
}
// ObjectConvertor converts an object to a different version.
type ObjectConvertor interface {
// Convert attempts to convert one object into another, or returns an error. This method does
// not guarantee the in object is not mutated. The context argument will be passed to
// all nested conversions.
Convert(in, out, context interface{}) error
// ConvertToVersion takes the provided object and converts it the provided version. This
// method does not guarantee that the in object is not mutated. This method is similar to
// Convert() but handles specific details of choosing the correct output version.
ConvertToVersion(in Object, gv GroupVersioner) (out Object, err error)
ConvertFieldLabel(version, kind, label, value string) (string, string, error)
}
// ObjectTyper contains methods for extracting the APIVersion and Kind
// of objects.
type ObjectTyper interface {
// ObjectKinds returns the all possible group,version,kind of the provided object, true if
// the object is unversioned, or an error if the object is not recognized
// (IsNotRegisteredError will return true).
ObjectKinds(Object) ([]unversioned.GroupVersionKind, bool, error)
// Recognizes returns true if the scheme is able to handle the provided version and kind,
// or more precisely that the provided version is a possible conversion or decoding
// target.
Recognizes(gvk unversioned.GroupVersionKind) bool
}
// ObjectCreater contains methods for instantiating an object by kind and version.
type ObjectCreater interface {
New(kind unversioned.GroupVersionKind) (out Object, err error)
}
// ObjectCopier duplicates an object.
type ObjectCopier interface {
// Copy returns an exact copy of the provided Object, or an error if the
// copy could not be completed.
Copy(Object) (Object, error)
}
// ResourceVersioner provides methods for setting and retrieving
// the resource version from an API object.
type ResourceVersioner interface {
SetResourceVersion(obj Object, version string) error
ResourceVersion(obj Object) (string, error)
}
// SelfLinker provides methods for setting and retrieving the SelfLink field of an API object.
type SelfLinker interface {
SetSelfLink(obj Object, selfLink string) error
SelfLink(obj Object) (string, error)
// Knowing Name is sometimes necessary to use a SelfLinker.
Name(obj Object) (string, error)
// Knowing Namespace is sometimes necessary to use a SelfLinker
Namespace(obj Object) (string, error)
}
// All API types registered with Scheme must support the Object interface. Since objects in a scheme are
// expected to be serialized to the wire, the interface an Object must provide to the Scheme allows
// serializers to set the kind, version, and group the object is represented as. An Object may choose
// to return a no-op ObjectKindAccessor in cases where it is not expected to be serialized.
type Object interface {
GetObjectKind() unversioned.ObjectKind
}
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