types.go

/*
Copyright 2015 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 unversioned contains API types that are common to all versions.
//
// The package contains two categories of types:
// - external (serialized) types that lack their own version (e.g TypeMeta)
// - internal (never-serialized) types that are needed by several different
//   api groups, and so live here, to avoid duplication and/or import loops
//   (e.g. LabelSelector).
// In the future, we will probably move these categories of objects into
// separate packages.
package v1

import (
	"fmt"
	"strings"

	"k8s.io/apimachinery/pkg/types"
)

// TypeMeta describes an individual object in an API response or request
// with strings representing the type of the object and its API schema version.
// Structures that are versioned or persisted should inline TypeMeta.
type TypeMeta struct {
	// Kind is a string value representing the REST resource this object represents.
	// Servers may infer this from the endpoint the client submits requests to.
	// Cannot be updated.
	// In CamelCase.
	// More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#types-kinds
	// +optional
	Kind string `json:"kind,omitempty" protobuf:"bytes,1,opt,name=kind"`

	// APIVersion defines the versioned schema of this representation of an object.
	// Servers should convert recognized schemas to the latest internal value, and
	// may reject unrecognized values.
	// More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#resources
	// +optional
	APIVersion string `json:"apiVersion,omitempty" protobuf:"bytes,2,opt,name=apiVersion"`
}

// ListMeta describes metadata that synthetic resources must have, including lists and
// various status objects. A resource may have only one of {ObjectMeta, ListMeta}.
type ListMeta struct {
	// SelfLink is a URL representing this object.
	// Populated by the system.
	// Read-only.
	// +optional
	SelfLink string `json:"selfLink,omitempty" protobuf:"bytes,1,opt,name=selfLink"`

	// String that identifies the server's internal version of this object that
	// can be used by clients to determine when objects have changed.
	// Value must be treated as opaque by clients and passed unmodified back to the server.
	// Populated by the system.
	// Read-only.
	// More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#concurrency-control-and-consistency
	// +optional
	ResourceVersion string `json:"resourceVersion,omitempty" protobuf:"bytes,2,opt,name=resourceVersion"`
}

// These are internal finalizer values for Kubernetes-like APIs, must be qualified name unless defined here
const (
	FinalizerOrphanDependents string = "orphan"
	FinalizerDeleteDependents string = "foregroundDeletion"
)

// ObjectMeta is metadata that all persisted resources must have, which includes all objects
// users must create.
type ObjectMeta struct {
	// Name must be unique within a namespace. Is required when creating resources, although
	// some resources may allow a client to request the generation of an appropriate name
	// automatically. Name is primarily intended for creation idempotence and configuration
	// definition.
	// Cannot be updated.
	// More info: http://kubernetes.io/docs/user-guide/identifiers#names
	// +optional
	Name string `json:"name,omitempty" protobuf:"bytes,1,opt,name=name"`

	// GenerateName is an optional prefix, used by the server, to generate a unique
	// name ONLY IF the Name field has not been provided.
	// If this field is used, the name returned to the client will be different
	// than the name passed. This value will also be combined with a unique suffix.
	// The provided value has the same validation rules as the Name field,
	// and may be truncated by the length of the suffix required to make the value
	// unique on the server.
	//
	// If this field is specified and the generated name exists, the server will
	// NOT return a 409 - instead, it will either return 201 Created or 500 with Reason
	// ServerTimeout indicating a unique name could not be found in the time allotted, and the client
	// should retry (optionally after the time indicated in the Retry-After header).
	//
	// Applied only if Name is not specified.
	// More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#idempotency
	// +optional
	GenerateName string `json:"generateName,omitempty" protobuf:"bytes,2,opt,name=generateName"`

	// Namespace defines the space within each name must be unique. An empty namespace is
	// equivalent to the "default" namespace, but "default" is the canonical representation.
	// Not all objects are required to be scoped to a namespace - the value of this field for
	// those objects will be empty.
	//
	// Must be a DNS_LABEL.
	// Cannot be updated.
	// More info: http://kubernetes.io/docs/user-guide/namespaces
	// +optional
	Namespace string `json:"namespace,omitempty" protobuf:"bytes,3,opt,name=namespace"`

	// SelfLink is a URL representing this object.
	// Populated by the system.
	// Read-only.
	// +optional
	SelfLink string `json:"selfLink,omitempty" protobuf:"bytes,4,opt,name=selfLink"`

	// UID is the unique in time and space value for this object. It is typically generated by
	// the server on successful creation of a resource and is not allowed to change on PUT
	// operations.
	//
	// Populated by the system.
	// Read-only.
	// More info: http://kubernetes.io/docs/user-guide/identifiers#uids
	// +optional
	UID types.UID `json:"uid,omitempty" protobuf:"bytes,5,opt,name=uid,casttype=k8s.io/kubernetes/pkg/types.UID"`

	// An opaque value that represents the internal version of this object that can
	// be used by clients to determine when objects have changed. May be used for optimistic
	// concurrency, change detection, and the watch operation on a resource or set of resources.
	// Clients must treat these values as opaque and passed unmodified back to the server.
	// They may only be valid for a particular resource or set of resources.
	//
	// Populated by the system.
	// Read-only.
	// Value must be treated as opaque by clients and .
	// More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#concurrency-control-and-consistency
	// +optional
	ResourceVersion string `json:"resourceVersion,omitempty" protobuf:"bytes,6,opt,name=resourceVersion"`

	// A sequence number representing a specific generation of the desired state.
	// Populated by the system. Read-only.
	// +optional
	Generation int64 `json:"generation,omitempty" protobuf:"varint,7,opt,name=generation"`

	// CreationTimestamp is a timestamp representing the server time when this object was
	// created. It is not guaranteed to be set in happens-before order across separate operations.
	// Clients may not set this value. It is represented in RFC3339 form and is in UTC.
	//
	// Populated by the system.
	// Read-only.
	// Null for lists.
	// More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#metadata
	// +optional
	CreationTimestamp Time `json:"creationTimestamp,omitempty" protobuf:"bytes,8,opt,name=creationTimestamp"`

	// DeletionTimestamp is RFC 3339 date and time at which this resource will be deleted. This
	// field is set by the server when a graceful deletion is requested by the user, and is not
	// directly settable by a client. The resource is expected to be deleted (no longer visible
	// from resource lists, and not reachable by name) after the time in this field. Once set,
	// this value may not be unset or be set further into the future, although it may be shortened
	// or the resource may be deleted prior to this time. For example, a user may request that
	// a pod is deleted in 30 seconds. The Kubelet will react by sending a graceful termination
	// signal to the containers in the pod. After that 30 seconds, the Kubelet will send a hard
	// termination signal (SIGKILL) to the container and after cleanup, remove the pod from the
	// API. In the presence of network partitions, this object may still exist after this
	// timestamp, until an administrator or automated process can determine the resource is
	// fully terminated.
	// If not set, graceful deletion of the object has not been requested.
	//
	// Populated by the system when a graceful deletion is requested.
	// Read-only.
	// More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#metadata
	// +optional
	DeletionTimestamp *Time `json:"deletionTimestamp,omitempty" protobuf:"bytes,9,opt,name=deletionTimestamp"`

	// Number of seconds allowed for this object to gracefully terminate before
	// it will be removed from the system. Only set when deletionTimestamp is also set.
	// May only be shortened.
	// Read-only.
	// +optional
	DeletionGracePeriodSeconds *int64 `json:"deletionGracePeriodSeconds,omitempty" protobuf:"varint,10,opt,name=deletionGracePeriodSeconds"`

	// Map of string keys and values that can be used to organize and categorize
	// (scope and select) objects. May match selectors of replication controllers
	// and services.
	// More info: http://kubernetes.io/docs/user-guide/labels
	// +optional
	Labels map[string]string `json:"labels,omitempty" protobuf:"bytes,11,rep,name=labels"`

	// Annotations is an unstructured key value map stored with a resource that may be
	// set by external tools to store and retrieve arbitrary metadata. They are not
	// queryable and should be preserved when modifying objects.
	// More info: http://kubernetes.io/docs/user-guide/annotations
	// +optional
	Annotations map[string]string `json:"annotations,omitempty" protobuf:"bytes,12,rep,name=annotations"`

	// List of objects depended by this object. If ALL objects in the list have
	// been deleted, this object will be garbage collected. If this object is managed by a controller,
	// then an entry in this list will point to this controller, with the controller field set to true.
	// There cannot be more than one managing controller.
	// +optional
	// +patchMergeKey=uid
	// +patchStrategy=merge
	OwnerReferences []OwnerReference `json:"ownerReferences,omitempty" patchStrategy:"merge" patchMergeKey:"uid" protobuf:"bytes,13,rep,name=ownerReferences"`

	// An initializer is a controller which enforces some system invariant at object creation time.
	// This field is a list of initializers that have not yet acted on this object. If nil or empty,
	// this object has been completely initialized. Otherwise, the object is considered uninitialized
	// and is hidden (in list/watch and get calls) from clients that haven't explicitly asked to
	// observe uninitialized objects.
	//
	// When an object is created, the system will populate this list with the current set of initializers.
	// Only privileged users may set or modify this list. Once it is empty, it may not be modified further
	// by any user.
	Initializers *Initializers `json:"initializers,omitempty" protobuf:"bytes,16,opt,name=initializers"`

	// Must be empty before the object is deleted from the registry. Each entry
	// is an identifier for the responsible component that will remove the entry
	// from the list. If the deletionTimestamp of the object is non-nil, entries
	// in this list can only be removed.
	// +optional
	// +patchStrategy=merge
	Finalizers []string `json:"finalizers,omitempty" patchStrategy:"merge" protobuf:"bytes,14,rep,name=finalizers"`

	// The name of the cluster which the object belongs to.
	// This is used to distinguish resources with same name and namespace in different clusters.
	// This field is not set anywhere right now and apiserver is going to ignore it if set in create or update request.
	// +optional
	ClusterName string `json:"clusterName,omitempty" protobuf:"bytes,15,opt,name=clusterName"`
}

// Initializers tracks the progress of initialization.
type Initializers struct {
	// Pending is a list of initializers that must execute in order before this object is visible.
	// When the last pending initializer is removed, and no failing result is set, the initializers
	// struct will be set to nil and the object is considered as initialized and visible to all
	// clients.
	Pending []Initializer `json:"pending" protobuf:"bytes,1,rep,name=pending"`
	// If result is set with the Failure field, the object will be persisted to storage and then deleted,
	// ensuring that other clients can observe the deletion.
	Result *Status `json:"result,omitempty" protobuf:"bytes,2,opt,name=result"`
}

// Initializer is information about an initializer that has not yet completed.
type Initializer struct {
	// name of the process that is responsible for initializing this object.
	Name string `json:"name" protobuf:"bytes,1,opt,name=name"`
}

const (
	// NamespaceDefault means the object is in the default namespace which is applied when not specified by clients
	NamespaceDefault string = "default"
	// NamespaceAll is the default argument to specify on a context when you want to list or filter resources across all namespaces
	NamespaceAll string = ""
	// NamespaceNone is the argument for a context when there is no namespace.
	NamespaceNone string = ""
	// NamespaceSystem is the system namespace where we place system components.
	NamespaceSystem string = "kube-system"
	// NamespacePublic is the namespace where we place public info (ConfigMaps)
	NamespacePublic string = "kube-public"
)

// OwnerReference contains enough information to let you identify an owning
// object. Currently, an owning object must be in the same namespace, so there
// is no namespace field.
type OwnerReference struct {
	// API version of the referent.
	APIVersion string `json:"apiVersion" protobuf:"bytes,5,opt,name=apiVersion"`
	// Kind of the referent.
	// More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#types-kinds
	Kind string `json:"kind" protobuf:"bytes,1,opt,name=kind"`
	// Name of the referent.
	// More info: http://kubernetes.io/docs/user-guide/identifiers#names
	Name string `json:"name" protobuf:"bytes,3,opt,name=name"`
	// UID of the referent.
	// More info: http://kubernetes.io/docs/user-guide/identifiers#uids
	UID types.UID `json:"uid" protobuf:"bytes,4,opt,name=uid,casttype=k8s.io/apimachinery/pkg/types.UID"`
	// If true, this reference points to the managing controller.
	// +optional
	Controller *bool `json:"controller,omitempty" protobuf:"varint,6,opt,name=controller"`
	// If true, AND if the owner has the "foregroundDeletion" finalizer, then
	// the owner cannot be deleted from the key-value store until this
	// reference is removed.
	// Defaults to false.
	// To set this field, a user needs "delete" permission of the owner,
	// otherwise 422 (Unprocessable Entity) will be returned.
	// +optional
	BlockOwnerDeletion *bool `json:"blockOwnerDeletion,omitempty" protobuf:"varint,7,opt,name=blockOwnerDeletion"`
}

// ListOptions is the query options to a standard REST list call.
type ListOptions struct {
	TypeMeta `json:",inline"`

	// A selector to restrict the list of returned objects by their labels.
	// Defaults to everything.
	// +optional
	LabelSelector string `json:"labelSelector,omitempty" protobuf:"bytes,1,opt,name=labelSelector"`
	// A selector to restrict the list of returned objects by their fields.
	// Defaults to everything.
	// +optional
	FieldSelector string `json:"fieldSelector,omitempty" protobuf:"bytes,2,opt,name=fieldSelector"`
	// If true, partially initialized resources are included in the response.
	// +optional
	IncludeUninitialized bool `json:"includeUninitialized,omitempty" protobuf:"varint,6,opt,name=includeUninitialized"`
	// Watch for changes to the described resources and return them as a stream of
	// add, update, and remove notifications. Specify resourceVersion.
	// +optional
	Watch bool `json:"watch,omitempty" protobuf:"varint,3,opt,name=watch"`
	// When specified with a watch call, shows changes that occur after that particular version of a resource.
	// Defaults to changes from the beginning of history.
	// When specified for list:
	// - if unset, then the result is returned from remote storage based on quorum-read flag;
	// - if it's 0, then we simply return what we currently have in cache, no guarantee;
	// - if set to non zero, then the result is at least as fresh as given rv.
	// +optional
	ResourceVersion string `json:"resourceVersion,omitempty" protobuf:"bytes,4,opt,name=resourceVersion"`
	// Timeout for the list/watch call.
	// +optional
	TimeoutSeconds *int64 `json:"timeoutSeconds,omitempty" protobuf:"varint,5,opt,name=timeoutSeconds"`
}

// ExportOptions is the query options to the standard REST get call.
type ExportOptions struct {
	TypeMeta `json:",inline"`
	// Should this value be exported.  Export strips fields that a user can not specify.
	Export bool `json:"export" protobuf:"varint,1,opt,name=export"`
	// Should the export be exact.  Exact export maintains cluster-specific fields like 'Namespace'.
	Exact bool `json:"exact" protobuf:"varint,2,opt,name=exact"`
}

// GetOptions is the standard query options to the standard REST get call.
type GetOptions struct {
	TypeMeta `json:",inline"`
	// When specified:
	// - if unset, then the result is returned from remote storage based on quorum-read flag;
	// - if it's 0, then we simply return what we currently have in cache, no guarantee;
	// - if set to non zero, then the result is at least as fresh as given rv.
	ResourceVersion string `json:"resourceVersion,omitempty" protobuf:"bytes,1,opt,name=resourceVersion"`
	// If true, partially initialized resources are included in the response.
	// +optional
	IncludeUninitialized bool `json:"includeUninitialized,omitempty" protobuf:"varint,2,opt,name=includeUninitialized"`
}

// DeletionPropagation decides if a deletion will propagate to the dependents of
// the object, and how the garbage collector will handle the propagation.
type DeletionPropagation string

const (
	// Orphans the dependents.
	DeletePropagationOrphan DeletionPropagation = "Orphan"
	// Deletes the object from the key-value store, the garbage collector will
	// delete the dependents in the background.
	DeletePropagationBackground DeletionPropagation = "Background"
	// The object exists in the key-value store until the garbage collector
	// deletes all the dependents whose ownerReference.blockOwnerDeletion=true
	// from the key-value store.  API sever will put the "foregroundDeletion"
	// finalizer on the object, and sets its deletionTimestamp.  This policy is
	// cascading, i.e., the dependents will be deleted with Foreground.
	DeletePropagationForeground DeletionPropagation = "Foreground"
)

// DeleteOptions may be provided when deleting an API object.
type DeleteOptions struct {
	TypeMeta `json:",inline"`

	// The duration in seconds before the object should be deleted. Value must be non-negative integer.
	// The value zero indicates delete immediately. If this value is nil, the default grace period for the
	// specified type will be used.
	// Defaults to a per object value if not specified. zero means delete immediately.
	// +optional
	GracePeriodSeconds *int64 `json:"gracePeriodSeconds,omitempty" protobuf:"varint,1,opt,name=gracePeriodSeconds"`

	// Must be fulfilled before a deletion is carried out. If not possible, a 409 Conflict status will be
	// returned.
	// +optional
	Preconditions *Preconditions `json:"preconditions,omitempty" protobuf:"bytes,2,opt,name=preconditions"`

	// Deprecated: please use the PropagationPolicy, this field will be deprecated in 1.7.
	// Should the dependent objects be orphaned. If true/false, the "orphan"
	// finalizer will be added to/removed from the object's finalizers list.
	// Either this field or PropagationPolicy may be set, but not both.
	// +optional
	OrphanDependents *bool `json:"orphanDependents,omitempty" protobuf:"varint,3,opt,name=orphanDependents"`

	// Whether and how garbage collection will be performed.
	// Either this field or OrphanDependents may be set, but not both.
	// The default policy is decided by the existing finalizer set in the
	// metadata.finalizers and the resource-specific default policy.
	// +optional
	PropagationPolicy *DeletionPropagation `json:"propagationPolicy,omitempty" protobuf:"varint,4,opt,name=propagationPolicy"`
}

// Preconditions must be fulfilled before an operation (update, delete, etc.) is carried out.
type Preconditions struct {
	// Specifies the target UID.
	// +optional
	UID *types.UID `json:"uid,omitempty" protobuf:"bytes,1,opt,name=uid,casttype=k8s.io/apimachinery/pkg/types.UID"`
}

// Status is a return value for calls that don't return other objects.
type Status struct {
	TypeMeta `json:",inline"`
	// Standard list metadata.
	// More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#types-kinds
	// +optional
	ListMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`

	// Status of the operation.
	// One of: "Success" or "Failure".
	// More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#spec-and-status
	// +optional
	Status string `json:"status,omitempty" protobuf:"bytes,2,opt,name=status"`
	// A human-readable description of the status of this operation.
	// +optional
	Message string `json:"message,omitempty" protobuf:"bytes,3,opt,name=message"`
	// A machine-readable description of why this operation is in the
	// "Failure" status. If this value is empty there
	// is no information available. A Reason clarifies an HTTP status
	// code but does not override it.
	// +optional
	Reason StatusReason `json:"reason,omitempty" protobuf:"bytes,4,opt,name=reason,casttype=StatusReason"`
	// Extended data associated with the reason.  Each reason may define its
	// own extended details. This field is optional and the data returned
	// is not guaranteed to conform to any schema except that defined by
	// the reason type.
	// +optional
	Details *StatusDetails `json:"details,omitempty" protobuf:"bytes,5,opt,name=details"`
	// Suggested HTTP return code for this status, 0 if not set.
	// +optional
	Code int32 `json:"code,omitempty" protobuf:"varint,6,opt,name=code"`
}

// StatusDetails is a set of additional properties that MAY be set by the
// server to provide additional information about a response. The Reason
// field of a Status object defines what attributes will be set. Clients
// must ignore fields that do not match the defined type of each attribute,
// and should assume that any attribute may be empty, invalid, or under
// defined.
type StatusDetails struct {
	// The name attribute of the resource associated with the status StatusReason
	// (when there is a single name which can be described).
	// +optional
	Name string `json:"name,omitempty" protobuf:"bytes,1,opt,name=name"`
	// The group attribute of the resource associated with the status StatusReason.
	// +optional
	Group string `json:"group,omitempty" protobuf:"bytes,2,opt,name=group"`
	// The kind attribute of the resource associated with the status StatusReason.
	// On some operations may differ from the requested resource Kind.
	// More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#types-kinds
	// +optional
	Kind string `json:"kind,omitempty" protobuf:"bytes,3,opt,name=kind"`
	// UID of the resource.
	// (when there is a single resource which can be described).
	// More info: http://kubernetes.io/docs/user-guide/identifiers#uids
	// +optional
	UID types.UID `json:"uid,omitempty" protobuf:"bytes,6,opt,name=uid,casttype=k8s.io/apimachinery/pkg/types.UID"`
	// The Causes array includes more details associated with the StatusReason
	// failure. Not all StatusReasons may provide detailed causes.
	// +optional
	Causes []StatusCause `json:"causes,omitempty" protobuf:"bytes,4,rep,name=causes"`
	// If specified, the time in seconds before the operation should be retried.
	// +optional
	RetryAfterSeconds int32 `json:"retryAfterSeconds,omitempty" protobuf:"varint,5,opt,name=retryAfterSeconds"`
}

// Values of Status.Status
const (
	StatusSuccess = "Success"
	StatusFailure = "Failure"
)

// StatusReason is an enumeration of possible failure causes.  Each StatusReason
// must map to a single HTTP status code, but multiple reasons may map
// to the same HTTP status code.
// TODO: move to apiserver
type StatusReason string

const (
	// StatusReasonUnknown means the server has declined to indicate a specific reason.
	// The details field may contain other information about this error.
	// Status code 500.
	StatusReasonUnknown StatusReason = ""

	// StatusReasonUnauthorized means the server can be reached and understood the request, but requires
	// the user to present appropriate authorization credentials (identified by the WWW-Authenticate header)
	// in order for the action to be completed. If the user has specified credentials on the request, the
	// server considers them insufficient.
	// Status code 401
	StatusReasonUnauthorized StatusReason = "Unauthorized"

	// StatusReasonForbidden means the server can be reached and understood the request, but refuses
	// to take any further action.  It is the result of the server being configured to deny access for some reason
	// to the requested resource by the client.
	// Details (optional):
	//   "kind" string - the kind attribute of the forbidden resource
	//                   on some operations may differ from the requested
	//                   resource.
	//   "id"   string - the identifier of the forbidden resource
	// Status code 403
	StatusReasonForbidden StatusReason = "Forbidden"

	// StatusReasonNotFound means one or more resources required for this operation
	// could not be found.
	// Details (optional):
	//   "kind" string - the kind attribute of the missing resource
	//                   on some operations may differ from the requested
	//                   resource.
	//   "id"   string - the identifier of the missing resource
	// Status code 404
	StatusReasonNotFound StatusReason = "NotFound"

	// StatusReasonAlreadyExists means the resource you are creating already exists.
	// Details (optional):
	//   "kind" string - the kind attribute of the conflicting resource
	//   "id"   string - the identifier of the conflicting resource
	// Status code 409
	StatusReasonAlreadyExists StatusReason = "AlreadyExists"

	// StatusReasonConflict means the requested operation cannot be completed
	// due to a conflict in the operation. The client may need to alter the
	// request. Each resource may define custom details that indicate the
	// nature of the conflict.
	// Status code 409
	StatusReasonConflict StatusReason = "Conflict"

	// StatusReasonGone means the item is no longer available at the server and no
	// forwarding address is known.
	// Status code 410
	StatusReasonGone StatusReason = "Gone"

	// StatusReasonInvalid means the requested create or update operation cannot be
	// completed due to invalid data provided as part of the request. The client may
	// need to alter the request. When set, the client may use the StatusDetails
	// message field as a summary of the issues encountered.
	// Details (optional):
	//   "kind" string - the kind attribute of the invalid resource
	//   "id"   string - the identifier of the invalid resource
	//   "causes"      - one or more StatusCause entries indicating the data in the
	//                   provided resource that was invalid.  The code, message, and
	//                   field attributes will be set.
	// Status code 422
	StatusReasonInvalid StatusReason = "Invalid"

	// StatusReasonServerTimeout means the server can be reached and understood the request,
	// but cannot complete the action in a reasonable time. The client should retry the request.
	// This is may be due to temporary server load or a transient communication issue with
	// another server. Status code 500 is used because the HTTP spec provides no suitable
	// server-requested client retry and the 5xx class represents actionable errors.
	// Details (optional):
	//   "kind" string - the kind attribute of the resource being acted on.
	//   "id"   string - the operation that is being attempted.
	//   "retryAfterSeconds" int32 - the number of seconds before the operation should be retried
	// Status code 500
	StatusReasonServerTimeout StatusReason = "ServerTimeout"

	// StatusReasonTimeout means that the request could not be completed within the given time.
	// Clients can get this response only when they specified a timeout param in the request,
	// or if the server cannot complete the operation within a reasonable amount of time.
	// The request might succeed with an increased value of timeout param. The client *should*
	// wait at least the number of seconds specified by the retryAfterSeconds field.
	// Details (optional):
	//   "retryAfterSeconds" int32 - the number of seconds before the operation should be retried
	// Status code 504
	StatusReasonTimeout StatusReason = "Timeout"

	// StatusReasonBadRequest means that the request itself was invalid, because the request
	// doesn't make any sense, for example deleting a read-only object.  This is different than
	// StatusReasonInvalid above which indicates that the API call could possibly succeed, but the
	// data was invalid.  API calls that return BadRequest can never succeed.
	StatusReasonBadRequest StatusReason = "BadRequest"

	// StatusReasonMethodNotAllowed means that the action the client attempted to perform on the
	// resource was not supported by the code - for instance, attempting to delete a resource that
	// can only be created. API calls that return MethodNotAllowed can never succeed.
	StatusReasonMethodNotAllowed StatusReason = "MethodNotAllowed"

	// StatusReasonInternalError indicates that an internal error occurred, it is unexpected
	// and the outcome of the call is unknown.
	// Details (optional):
	//   "causes" - The original error
	// Status code 500
	StatusReasonInternalError StatusReason = "InternalError"

	// StatusReasonExpired indicates that the request is invalid because the content you are requesting
	// has expired and is no longer available. It is typically associated with watches that can't be
	// serviced.
	// Status code 410 (gone)
	StatusReasonExpired StatusReason = "Expired"

	// StatusReasonServiceUnavailable means that the request itself was valid,
	// but the requested service is unavailable at this time.
	// Retrying the request after some time might succeed.
	// Status code 503
	StatusReasonServiceUnavailable StatusReason = "ServiceUnavailable"
)

// StatusCause provides more information about an api.Status failure, including
// cases when multiple errors are encountered.
type StatusCause struct {
	// A machine-readable description of the cause of the error. If this value is
	// empty there is no information available.
	// +optional
	Type CauseType `json:"reason,omitempty" protobuf:"bytes,1,opt,name=reason,casttype=CauseType"`
	// A human-readable description of the cause of the error.  This field may be
	// presented as-is to a reader.
	// +optional
	Message string `json:"message,omitempty" protobuf:"bytes,2,opt,name=message"`
	// The field of the resource that has caused this error, as named by its JSON
	// serialization. May include dot and postfix notation for nested attributes.
	// Arrays are zero-indexed.  Fields may appear more than once in an array of
	// causes due to fields having multiple errors.
	// Optional.
	//
	// Examples:
	//   "name" - the field "name" on the current resource
	//   "items[0].name" - the field "name" on the first array entry in "items"
	// +optional
	Field string `json:"field,omitempty" protobuf:"bytes,3,opt,name=field"`
}

// CauseType is a machine readable value providing more detail about what
// occurred in a status response. An operation may have multiple causes for a
// status (whether Failure or Success).
type CauseType string

const (
	// CauseTypeFieldValueNotFound is used to report failure to find a requested value
	// (e.g. looking up an ID).
	CauseTypeFieldValueNotFound CauseType = "FieldValueNotFound"
	// CauseTypeFieldValueRequired is used to report required values that are not
	// provided (e.g. empty strings, null values, or empty arrays).
	CauseTypeFieldValueRequired CauseType = "FieldValueRequired"
	// CauseTypeFieldValueDuplicate is used to report collisions of values that must be
	// unique (e.g. unique IDs).
	CauseTypeFieldValueDuplicate CauseType = "FieldValueDuplicate"
	// CauseTypeFieldValueInvalid is used to report malformed values (e.g. failed regex
	// match).
	CauseTypeFieldValueInvalid CauseType = "FieldValueInvalid"
	// CauseTypeFieldValueNotSupported is used to report valid (as per formatting rules)
	// values that can not be handled (e.g. an enumerated string).
	CauseTypeFieldValueNotSupported CauseType = "FieldValueNotSupported"
	// CauseTypeUnexpectedServerResponse is used to report when the server responded to the client
	// without the expected return type. The presence of this cause indicates the error may be
	// due to an intervening proxy or the server software malfunctioning.
	CauseTypeUnexpectedServerResponse CauseType = "UnexpectedServerResponse"
)

// APIVersions lists the versions that are available, to allow clients to
// discover the API at /api, which is the root path of the legacy v1 API.
//
// +protobuf.options.(gogoproto.goproto_stringer)=false
type APIVersions struct {
	TypeMeta `json:",inline"`
	// versions are the api versions that are available.
	Versions []string `json:"versions" protobuf:"bytes,1,rep,name=versions"`
	// a map of client CIDR to server address that is serving this group.
	// This is to help clients reach servers in the most network-efficient way possible.
	// Clients can use the appropriate server address as per the CIDR that they match.
	// In case of multiple matches, clients should use the longest matching CIDR.
	// The server returns only those CIDRs that it thinks that the client can match.
	// For example: the master will return an internal IP CIDR only, if the client reaches the server using an internal IP.
	// Server looks at X-Forwarded-For header or X-Real-Ip header or request.RemoteAddr (in that order) to get the client IP.
	ServerAddressByClientCIDRs []ServerAddressByClientCIDR `json:"serverAddressByClientCIDRs" protobuf:"bytes,2,rep,name=serverAddressByClientCIDRs"`
}

// APIGroupList is a list of APIGroup, to allow clients to discover the API at
// /apis.
type APIGroupList struct {
	TypeMeta `json:",inline"`
	// groups is a list of APIGroup.
	Groups []APIGroup `json:"groups" protobuf:"bytes,1,rep,name=groups"`
}

// APIGroup contains the name, the supported versions, and the preferred version
// of a group.
type APIGroup struct {
	TypeMeta `json:",inline"`
	// name is the name of the group.
	Name string `json:"name" protobuf:"bytes,1,opt,name=name"`
	// versions are the versions supported in this group.
	Versions []GroupVersionForDiscovery `json:"versions" protobuf:"bytes,2,rep,name=versions"`
	// preferredVersion is the version preferred by the API server, which
	// probably is the storage version.
	// +optional
	PreferredVersion GroupVersionForDiscovery `json:"preferredVersion,omitempty" protobuf:"bytes,3,opt,name=preferredVersion"`
	// a map of client CIDR to server address that is serving this group.
	// This is to help clients reach servers in the most network-efficient way possible.
	// Clients can use the appropriate server address as per the CIDR that they match.
	// In case of multiple matches, clients should use the longest matching CIDR.
	// The server returns only those CIDRs that it thinks that the client can match.
	// For example: the master will return an internal IP CIDR only, if the client reaches the server using an internal IP.
	// Server looks at X-Forwarded-For header or X-Real-Ip header or request.RemoteAddr (in that order) to get the client IP.
	ServerAddressByClientCIDRs []ServerAddressByClientCIDR `json:"serverAddressByClientCIDRs" protobuf:"bytes,4,rep,name=serverAddressByClientCIDRs"`
}

// ServerAddressByClientCIDR helps the client to determine the server address that they should use, depending on the clientCIDR that they match.
type ServerAddressByClientCIDR struct {
	// The CIDR with which clients can match their IP to figure out the server address that they should use.
	ClientCIDR string `json:"clientCIDR" protobuf:"bytes,1,opt,name=clientCIDR"`
	// Address of this server, suitable for a client that matches the above CIDR.
	// This can be a hostname, hostname:port, IP or IP:port.
	ServerAddress string `json:"serverAddress" protobuf:"bytes,2,opt,name=serverAddress"`
}

// GroupVersion contains the "group/version" and "version" string of a version.
// It is made a struct to keep extensibility.
type GroupVersionForDiscovery struct {
	// groupVersion specifies the API group and version in the form "group/version"
	GroupVersion string `json:"groupVersion" protobuf:"bytes,1,opt,name=groupVersion"`
	// version specifies the version in the form of "version". This is to save
	// the clients the trouble of splitting the GroupVersion.
	Version string `json:"version" protobuf:"bytes,2,opt,name=version"`
}

// APIResource specifies the name of a resource and whether it is namespaced.
type APIResource struct {
	// name is the plural name of the resource.
	Name string `json:"name" protobuf:"bytes,1,opt,name=name"`
	// singularName is the singular name of the resource.  This allows clients to handle plural and singular opaquely.
	// The singularName is more correct for reporting status on a single item and both singular and plural are allowed
	// from the kubectl CLI interface.
	SingularName string `json:"singularName" protobuf:"bytes,6,opt,name=singularName"`
	// namespaced indicates if a resource is namespaced or not.
	Namespaced bool `json:"namespaced" protobuf:"varint,2,opt,name=namespaced"`
	// kind is the kind for the resource (e.g. 'Foo' is the kind for a resource 'foo')
	Kind string `json:"kind" protobuf:"bytes,3,opt,name=kind"`
	// verbs is a list of supported kube verbs (this includes get, list, watch, create,
	// update, patch, delete, deletecollection, and proxy)
	Verbs Verbs `json:"verbs" protobuf:"bytes,4,opt,name=verbs"`
	// shortNames is a list of suggested short names of the resource.
	ShortNames []string `json:"shortNames,omitempty" protobuf:"bytes,5,rep,name=shortNames"`
	// categories is a list of the grouped resources this resource belongs to (e.g. 'all')
	Categories []string `json:"categories,omitempty" protobuf:"bytes,7,rep,name=categories"`
}

// Verbs masks the value so protobuf can generate
//
// +protobuf.nullable=true
// +protobuf.options.(gogoproto.goproto_stringer)=false
type Verbs []string

func (vs Verbs) String() string {
	return fmt.Sprintf("%v", []string(vs))
}

// APIResourceList is a list of APIResource, it is used to expose the name of the
// resources supported in a specific group and version, and if the resource
// is namespaced.
type APIResourceList struct {
	TypeMeta `json:",inline"`
	// groupVersion is the group and version this APIResourceList is for.
	GroupVersion string `json:"groupVersion" protobuf:"bytes,1,opt,name=groupVersion"`
	// resources contains the name of the resources and if they are namespaced.
	APIResources []APIResource `json:"resources" protobuf:"bytes,2,rep,name=resources"`
}

// RootPaths lists the paths available at root.
// For example: "/healthz", "/apis".
type RootPaths struct {
	// paths are the paths available at root.
	Paths []string `json:"paths" protobuf:"bytes,1,rep,name=paths"`
}

// TODO: remove me when watch is refactored
func LabelSelectorQueryParam(version string) string {
	return "labelSelector"
}

// TODO: remove me when watch is refactored
func FieldSelectorQueryParam(version string) string {
	return "fieldSelector"
}

// String returns available api versions as a human-friendly version string.
func (apiVersions APIVersions) String() string {
	return strings.Join(apiVersions.Versions, ",")
}

func (apiVersions APIVersions) GoString() string {
	return apiVersions.String()
}

// Patch is provided to give a concrete name and type to the Kubernetes PATCH request body.
type Patch struct{}

// Note:
// There are two different styles of label selectors used in versioned types:
// an older style which is represented as just a string in versioned types, and a
// newer style that is structured.  LabelSelector is an internal representation for the
// latter style.

// A label selector is a label query over a set of resources. The result of matchLabels and
// matchExpressions are ANDed. An empty label selector matches all objects. A null
// label selector matches no objects.
type LabelSelector struct {
	// matchLabels is a map of {key,value} pairs. A single {key,value} in the matchLabels
	// map is equivalent to an element of matchExpressions, whose key field is "key", the
	// operator is "In", and the values array contains only "value". The requirements are ANDed.
	// +optional
	MatchLabels map[string]string `json:"matchLabels,omitempty" protobuf:"bytes,1,rep,name=matchLabels"`
	// matchExpressions is a list of label selector requirements. The requirements are ANDed.
	// +optional
	MatchExpressions []LabelSelectorRequirement `json:"matchExpressions,omitempty" protobuf:"bytes,2,rep,name=matchExpressions"`
}

// A label selector requirement is a selector that contains values, a key, and an operator that
// relates the key and values.
type LabelSelectorRequirement struct {
	// key is the label key that the selector applies to.
	// +patchMergeKey=key
	// +patchStrategy=merge
	Key string `json:"key" patchStrategy:"merge" patchMergeKey:"key" protobuf:"bytes,1,opt,name=key"`
	// operator represents a key's relationship to a set of values.
	// Valid operators ard In, NotIn, Exists and DoesNotExist.
	Operator LabelSelectorOperator `json:"operator" protobuf:"bytes,2,opt,name=operator,casttype=LabelSelectorOperator"`
	// values is an array of string values. If the operator is In or NotIn,
	// the values array must be non-empty. If the operator is Exists or DoesNotExist,
	// the values array must be empty. This array is replaced during a strategic
	// merge patch.
	// +optional
	Values []string `json:"values,omitempty" protobuf:"bytes,3,rep,name=values"`
}

// A label selector operator is the set of operators that can be used in a selector requirement.
type LabelSelectorOperator string

const (
	LabelSelectorOpIn           LabelSelectorOperator = "In"
	LabelSelectorOpNotIn        LabelSelectorOperator = "NotIn"
	LabelSelectorOpExists       LabelSelectorOperator = "Exists"
	LabelSelectorOpDoesNotExist LabelSelectorOperator = "DoesNotExist"
)