discovery

package
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Published: Jan 4, 2023 License: Apache-2.0 Imports: 23 Imported by: 0

Documentation

Overview

Package discovery provides ways to discover server-supported API groups, versions and resources.

Index

Constants

View Source
const (
	AcceptV1 = runtime.ContentTypeJSON
	// Aggregated discovery content-type (currently v2beta1). NOTE: Currently, we are assuming the order
	// for "g", "v", and "as" from the server. We can only compare this string if we can make that assumption.
	AcceptV2Beta1 = runtime.ContentTypeJSON + ";" + "g=apidiscovery.k8s.io;v=v2beta1;as=APIGroupDiscoveryList"
)

Variables

This section is empty.

Functions

func FilteredBy

FilteredBy filters by the given predicate. Empty APIResourceLists are dropped.

func GroupVersionResources

func GroupVersionResources(rls []*metav1.APIResourceList) (map[schema.GroupVersionResource]struct{}, error)

GroupVersionResources converts APIResourceLists to the GroupVersionResources.

func IsGroupDiscoveryFailedError

func IsGroupDiscoveryFailedError(err error) bool

IsGroupDiscoveryFailedError returns true if the provided error indicates the server was unable to discover a complete list of APIs for the client to use.

func IsResourceEnabled

func IsResourceEnabled(client DiscoveryInterface, resourceToCheck schema.GroupVersionResource) (bool, error)

IsResourceEnabled queries the server to determine if the resource specified is present on the server. This is particularly helpful when writing a controller or an e2e test that requires a particular resource to function.

func MatchesServerVersion

func MatchesServerVersion(clientVersion apimachineryversion.Info, client DiscoveryInterface) error

MatchesServerVersion queries the server to compares the build version (git hash) of the client with the server's build version. It returns an error if it failed to contact the server or if the versions are not an exact match.

func ServerGroupsAndResources

func ServerGroupsAndResources(d DiscoveryInterface) ([]*metav1.APIGroup, []*metav1.APIResourceList, error)

func ServerPreferredNamespacedResources

func ServerPreferredNamespacedResources(d DiscoveryInterface) ([]*metav1.APIResourceList, error)

ServerPreferredNamespacedResources uses the provided discovery interface to look up preferred namespaced resources

func ServerPreferredResources

func ServerPreferredResources(d DiscoveryInterface) ([]*metav1.APIResourceList, error)

ServerPreferredResources uses the provided discovery interface to look up preferred resources

func ServerSupportsVersion

func ServerSupportsVersion(client DiscoveryInterface, requiredGV schema.GroupVersion) error

ServerSupportsVersion returns an error if the server doesn't have the required version

func SplitGroupsAndResources

func SplitGroupsAndResources(aggregatedGroups apidiscovery.APIGroupDiscoveryList) (*metav1.APIGroupList, map[schema.GroupVersion]*metav1.APIResourceList)

SplitGroupsAndResources transforms "aggregated" discovery top-level structure into the previous "unaggregated" discovery groups and resources.

Types

type AggregatedDiscoveryInterface

type AggregatedDiscoveryInterface interface {
	DiscoveryInterface

	GroupsAndMaybeResources() (*metav1.APIGroupList, map[schema.GroupVersion]*metav1.APIResourceList, error)
}

AggregatedDiscoveryInterface extends DiscoveryInterface to include a method to possibly return discovery resources along with the discovery groups, which is what the newer aggregated discovery format does (APIGroupDiscoveryList).

type CachedDiscoveryInterface

type CachedDiscoveryInterface interface {
	DiscoveryInterface
	// Fresh is supposed to tell the caller whether or not to retry if the cache
	// fails to find something (false = retry, true = no need to retry).
	//
	// TODO: this needs to be revisited, this interface can't be locked properly
	// and doesn't make a lot of sense.
	Fresh() bool
	// Invalidate enforces that no cached data that is older than the current time
	// is used.
	Invalidate()
}

CachedDiscoveryInterface is a DiscoveryInterface with cache invalidation and freshness. Note that If the ServerResourcesForGroupVersion method returns a cache miss error, the user needs to explicitly call Invalidate to clear the cache, otherwise the same cache miss error will be returned next time.

type DiscoveryClient

type DiscoveryClient struct {
	LegacyPrefix string
	// Forces the client to request only "unaggregated" (legacy) discovery.
	UseLegacyDiscovery bool
	// contains filtered or unexported fields
}

DiscoveryClient implements the functions that discover server-supported API groups, versions and resources.

func NewDiscoveryClient

func NewDiscoveryClient(c restclient.Interface) *DiscoveryClient

NewDiscoveryClient returns a new DiscoveryClient for the given RESTClient.

func NewDiscoveryClientForConfig

func NewDiscoveryClientForConfig(c *restclient.Config) (*DiscoveryClient, error)

NewDiscoveryClientForConfig creates a new DiscoveryClient for the given config. This client can be used to discover supported resources in the API server. NewDiscoveryClientForConfig is equivalent to NewDiscoveryClientForConfigAndClient(c, httpClient), where httpClient was generated with rest.HTTPClientFor(c).

func NewDiscoveryClientForConfigAndClient

func NewDiscoveryClientForConfigAndClient(c *restclient.Config, httpClient *http.Client) (*DiscoveryClient, error)

NewDiscoveryClientForConfigAndClient creates a new DiscoveryClient for the given config. This client can be used to discover supported resources in the API server. Note the http client provided takes precedence over the configured transport values.

func NewDiscoveryClientForConfigOrDie

func NewDiscoveryClientForConfigOrDie(c *restclient.Config) *DiscoveryClient

NewDiscoveryClientForConfigOrDie creates a new DiscoveryClient for the given config. If there is an error, it panics.

func (*DiscoveryClient) GroupsAndMaybeResources

func (d *DiscoveryClient) GroupsAndMaybeResources() (*metav1.APIGroupList, map[schema.GroupVersion]*metav1.APIResourceList, error)

GroupsAndMaybeResources returns the discovery groups, and (if new aggregated discovery format) the resources keyed by group/version. Merges discovery groups and resources from /api and /apis (either aggregated or not). Legacy groups must be ordered first. The server will either return both endpoints (/api, /apis) as aggregated discovery format or legacy format. For safety, resources will only be returned if both endpoints returned resources.

func (*DiscoveryClient) OpenAPISchema

func (d *DiscoveryClient) OpenAPISchema() (*openapi_v2.Document, error)

OpenAPISchema fetches the open api v2 schema using a rest client and parses the proto.

func (*DiscoveryClient) OpenAPIV3

func (d *DiscoveryClient) OpenAPIV3() openapi.Client

func (*DiscoveryClient) RESTClient

func (d *DiscoveryClient) RESTClient() restclient.Interface

RESTClient returns a RESTClient that is used to communicate with API server by this client implementation.

func (*DiscoveryClient) ServerGroups

func (d *DiscoveryClient) ServerGroups() (*metav1.APIGroupList, error)

ServerGroups returns the supported groups, with information like supported versions and the preferred version.

func (*DiscoveryClient) ServerGroupsAndResources

func (d *DiscoveryClient) ServerGroupsAndResources() ([]*metav1.APIGroup, []*metav1.APIResourceList, error)

ServerGroupsAndResources returns the supported resources for all groups and versions.

func (*DiscoveryClient) ServerPreferredNamespacedResources

func (d *DiscoveryClient) ServerPreferredNamespacedResources() ([]*metav1.APIResourceList, error)

ServerPreferredNamespacedResources returns the supported namespaced resources with the version preferred by the server.

func (*DiscoveryClient) ServerPreferredResources

func (d *DiscoveryClient) ServerPreferredResources() ([]*metav1.APIResourceList, error)

ServerPreferredResources returns the supported resources with the version preferred by the server.

func (*DiscoveryClient) ServerResourcesForGroupVersion

func (d *DiscoveryClient) ServerResourcesForGroupVersion(groupVersion string) (resources *metav1.APIResourceList, err error)

ServerResourcesForGroupVersion returns the supported resources for a group and version.

func (*DiscoveryClient) ServerVersion

func (d *DiscoveryClient) ServerVersion() (*version.Info, error)

ServerVersion retrieves and parses the server's version (git version).

func (*DiscoveryClient) WithLegacy

func (d *DiscoveryClient) WithLegacy() DiscoveryInterface

WithLegacy returns copy of current discovery client that will only receive the legacy discovery format.

type DiscoveryInterface

type DiscoveryInterface interface {
	RESTClient() restclient.Interface
	ServerGroupsInterface
	ServerResourcesInterface
	ServerVersionInterface
	OpenAPISchemaInterface
	OpenAPIV3SchemaInterface
	// Returns copy of current discovery client that will only
	// receive the legacy discovery format, or pointer to current
	// discovery client if it does not support legacy-only discovery.
	WithLegacy() DiscoveryInterface
}

DiscoveryInterface holds the methods that discover server-supported API groups, versions and resources.

type ErrGroupDiscoveryFailed

type ErrGroupDiscoveryFailed struct {
	// Groups is a list of the groups that failed to load and the error cause
	Groups map[schema.GroupVersion]error
}

ErrGroupDiscoveryFailed is returned if one or more API groups fail to load.

func (*ErrGroupDiscoveryFailed) Error

func (e *ErrGroupDiscoveryFailed) Error() string

Error implements the error interface

type OpenAPISchemaInterface

type OpenAPISchemaInterface interface {
	// OpenAPISchema retrieves and parses the swagger API schema the server supports.
	OpenAPISchema() (*openapi_v2.Document, error)
}

OpenAPISchemaInterface has a method to retrieve the open API schema.

type OpenAPIV3SchemaInterface

type OpenAPIV3SchemaInterface interface {
	OpenAPIV3() openapi.Client
}

type ResourcePredicate

type ResourcePredicate interface {
	Match(groupVersion string, r *metav1.APIResource) bool
}

ResourcePredicate has a method to check if a resource matches a given condition.

type ResourcePredicateFunc

type ResourcePredicateFunc func(groupVersion string, r *metav1.APIResource) bool

ResourcePredicateFunc returns true if it matches a resource based on a custom condition.

func (ResourcePredicateFunc) Match

func (fn ResourcePredicateFunc) Match(groupVersion string, r *metav1.APIResource) bool

Match is a wrapper around ResourcePredicateFunc.

type ServerGroupsInterface

type ServerGroupsInterface interface {
	// ServerGroups returns the supported groups, with information like supported versions and the
	// preferred version.
	ServerGroups() (*metav1.APIGroupList, error)
}

ServerGroupsInterface has methods for obtaining supported groups on the API server

type ServerResourcesInterface

type ServerResourcesInterface interface {
	// ServerResourcesForGroupVersion returns the supported resources for a group and version.
	ServerResourcesForGroupVersion(groupVersion string) (*metav1.APIResourceList, error)
	// ServerGroupsAndResources returns the supported groups and resources for all groups and versions.
	//
	// The returned group and resource lists might be non-nil with partial results even in the
	// case of non-nil error.
	ServerGroupsAndResources() ([]*metav1.APIGroup, []*metav1.APIResourceList, error)
	// ServerPreferredResources returns the supported resources with the version preferred by the
	// server.
	//
	// The returned group and resource lists might be non-nil with partial results even in the
	// case of non-nil error.
	ServerPreferredResources() ([]*metav1.APIResourceList, error)
	// ServerPreferredNamespacedResources returns the supported namespaced resources with the
	// version preferred by the server.
	//
	// The returned resource list might be non-nil with partial results even in the case of
	// non-nil error.
	ServerPreferredNamespacedResources() ([]*metav1.APIResourceList, error)
}

ServerResourcesInterface has methods for obtaining supported resources on the API server

type ServerVersionInterface

type ServerVersionInterface interface {
	// ServerVersion retrieves and parses the server's version (git version).
	ServerVersion() (*version.Info, error)
}

ServerVersionInterface has a method for retrieving the server's version.

type SupportsAllVerbs

type SupportsAllVerbs struct {
	Verbs []string
}

SupportsAllVerbs is a predicate matching a resource iff all given verbs are supported.

func (SupportsAllVerbs) Match

func (p SupportsAllVerbs) Match(groupVersion string, r *metav1.APIResource) bool

Match checks if a resource contains all the given verbs.

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