resource

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Version: v1.0.8 Latest Latest
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Published: Nov 7, 2015 License: Apache-2.0 Imports: 24 Imported by: 0

Documentation

Overview

Package resource assists clients in dealing with RESTful objects that match the Kubernetes API conventions. The Helper object provides simple CRUD operations on resources. The Visitor interface makes it easy to deal with multiple resources in bulk for retrieval and operation. The Builder object simplifies converting standard command line arguments and parameters into a Visitor that can iterate over all of the identified resources, whether on the server or on the local filesystem.

Index

Constants

This section is empty.

Variables

View Source
var FileExtensions = []string{".json", ".yaml", ".yml"}
View Source
var InputExtensions = append(FileExtensions, "stdin")

Functions

func AsVersionedObject

func AsVersionedObject(infos []*Info, forceList bool, version string) (runtime.Object, error)

AsVersionedObject converts a list of infos into a single object - either a List containing the objects as children, or if only a single Object is present, as that object. The provided version will be preferred as the conversion target, but the Object's mapping version will be used if that version is not present.

func AsVersionedObjects

func AsVersionedObjects(infos []*Info, version string) ([]runtime.Object, error)

AsVersionedObjects converts a list of infos into versioned objects. The provided version will be preferred as the conversion target, but the Object's mapping version will be used if that version is not present.

func FilterNamespace

func FilterNamespace(info *Info, err error) error

FilterNamespace omits the namespace if the object is not namespace scoped

func RetrieveLatest

func RetrieveLatest(info *Info, err error) error

RetrieveLatest updates the Object on each Info by invoking a standard client Get.

func RetrieveLazy

func RetrieveLazy(info *Info, err error) error

RetrieveLazy updates the object if it has not been loaded yet.

func SplitResourceArgument

func SplitResourceArgument(arg string) []string

SplitResourceArgument splits the argument with commas and returns unique strings in the original order.

func UpdateObjectNamespace

func UpdateObjectNamespace(info *Info, err error) error

func ValidateSchema

func ValidateSchema(data []byte, schema validation.Schema) error

Types

type Builder

type Builder struct {
	// contains filtered or unexported fields
}

Builder provides convenience functions for taking arguments and parameters from the command line and converting them to a list of resources to iterate over using the Visitor interface.

func NewBuilder

func NewBuilder(mapper meta.RESTMapper, typer runtime.ObjectTyper, clientMapper ClientMapper) *Builder

NewBuilder creates a builder that operates on generic objects.

func (*Builder) AllNamespaces

func (b *Builder) AllNamespaces(allNamespace bool) *Builder

AllNamespaces instructs the builder to use NamespaceAll as a namespace to request resources acroll all namespace. This overrides the namespace set by NamespaceParam().

func (*Builder) ContinueOnError

func (b *Builder) ContinueOnError() *Builder

ContinueOnError will attempt to load and visit as many objects as possible, even if some visits return errors or some objects cannot be loaded. The default behavior is to terminate after the first error is returned from a VisitorFunc.

func (*Builder) DefaultNamespace

func (b *Builder) DefaultNamespace() *Builder

DefaultNamespace instructs the builder to set the namespace value for any object found to NamespaceParam() if empty.

func (*Builder) Do

func (b *Builder) Do() *Result

Do returns a Result object with a Visitor for the resources identified by the Builder. The visitor will respect the error behavior specified by ContinueOnError. Note that stream inputs are consumed by the first execution - use Infos() or Object() on the Result to capture a list for further iteration.

func (*Builder) FilenameParam

func (b *Builder) FilenameParam(enforceNamespace bool, paths ...string) *Builder

FilenameParam groups input in two categories: URLs and files (files, directories, STDIN) If enforceNamespace is false, namespaces in the specs will be allowed to override the default namespace. If it is true, namespaces that don't match will cause an error. If ContinueOnError() is set prior to this method, objects on the path that are not recognized will be ignored (but logged at V(2)).

func (*Builder) Flatten

func (b *Builder) Flatten() *Builder

Flatten will convert any objects with a field named "Items" that is an array of runtime.Object compatible types into individual entries and give them their own items. The original object is not passed to any visitors.

func (*Builder) Latest

func (b *Builder) Latest() *Builder

Latest will fetch the latest copy of any objects loaded from URLs or files from the server.

func (*Builder) NamespaceParam

func (b *Builder) NamespaceParam(namespace string) *Builder

NamespaceParam accepts the namespace that these resources should be considered under from - used by DefaultNamespace() and RequireNamespace()

func (*Builder) Path

func (b *Builder) Path(paths ...string) *Builder

Path accepts a set of paths that may be files, directories (all can containing one or more resources). Creates a FileVisitor for each file and then each FileVisitor is streaming the content to a StreamVisitor. If ContinueOnError() is set prior to this method being called, objects on the path that are unrecognized will be ignored (but logged at V(2)).

func (*Builder) RequireNamespace

func (b *Builder) RequireNamespace() *Builder

RequireNamespace instructs the builder to set the namespace value for any object found to NamespaceParam() if empty, and if the value on the resource does not match NamespaceParam() an error will be returned.

func (*Builder) RequireObject

func (b *Builder) RequireObject(require bool) *Builder

RequireObject ensures that resulting infos have an object set. If false, resulting info may not have an object set.

func (*Builder) ResourceNames added in v1.0.7

func (b *Builder) ResourceNames(resource string, names ...string) *Builder

ResourceNames accepts a default type or group/type and one or more names, and creates tuples of resources

func (*Builder) ResourceTypeOrNameArgs

func (b *Builder) ResourceTypeOrNameArgs(allowEmptySelector bool, args ...string) *Builder

ResourceTypeOrNameArgs indicates that the builder should accept arguments of the form `(<type1>[,<type2>,...] [<name1>[ <name2> ...]]|<type1>/<name1> [<type2>/<name2>...]|)` When one argument is received, the types provided will be retrieved from the server (and be comma delimited). The allowEmptySelector permits to select all the resources (via Everything func). <type> = (<group>/<resource type> | <resource type>)

func (*Builder) ResourceTypes

func (b *Builder) ResourceTypes(types ...string) *Builder

ResourceTypes is a list of types of resources to operate on, when listing objects on the server or retrieving objects that match a selector.

func (*Builder) Schema

func (b *Builder) Schema(schema validation.Schema) *Builder

func (*Builder) SelectAllParam

func (b *Builder) SelectAllParam(selectAll bool) *Builder

SelectEverythingParam

func (*Builder) Selector

func (b *Builder) Selector(selector labels.Selector) *Builder

Selector accepts a selector directly, and if non nil will trigger a list action.

func (*Builder) SelectorParam

func (b *Builder) SelectorParam(s string) *Builder

SelectorParam defines a selector that should be applied to the object types to load. This will not affect files loaded from disk or URL. If the parameter is empty it is a no-op - to select all resources invoke `b.Selector(labels.Everything)`.

func (*Builder) SingleResourceType

func (b *Builder) SingleResourceType() *Builder

SingleResourceType will cause the builder to error if the user specifies more than a single type of resource.

func (*Builder) Stdin

func (b *Builder) Stdin() *Builder

Stdin will read objects from the standard input. If ContinueOnError() is set prior to this method being called, objects in the stream that are unrecognized will be ignored (but logged at V(2)).

func (*Builder) Stream

func (b *Builder) Stream(r io.Reader, name string) *Builder

Stream will read objects from the provided reader, and if an error occurs will include the name string in the error message. If ContinueOnError() is set prior to this method being called, objects in the stream that are unrecognized will be ignored (but logged at V(2)).

func (*Builder) URL

func (b *Builder) URL(urls ...*url.URL) *Builder

URL accepts a number of URLs directly.

type ClientMapper

type ClientMapper interface {
	ClientForMapping(mapping *meta.RESTMapping) (RESTClient, error)
}

ClientMapper retrieves a client object for a given mapping

type ClientMapperFunc

type ClientMapperFunc func(mapping *meta.RESTMapping) (RESTClient, error)

ClientMapperFunc implements ClientMapper for a function

func (ClientMapperFunc) ClientForMapping

func (f ClientMapperFunc) ClientForMapping(mapping *meta.RESTMapping) (RESTClient, error)

ClientForMapping implements ClientMapper

type ContinueOnErrorVisitor

type ContinueOnErrorVisitor struct {
	Visitor
}

ContinueOnErrorVisitor visits each item and, if an error occurs on any individual item, returns an aggregate error after all items are visited.

func (ContinueOnErrorVisitor) Visit

Visit returns nil if no error occurs during traversal, a regular error if one occurs, or if multiple errors occur, an aggregate error. If the provided visitor fails on any individual item it will not prevent the remaining items from being visited. An error returned by the visitor directly may still result in some items not being visited.

type DecoratedVisitor

type DecoratedVisitor struct {
	// contains filtered or unexported fields
}

DecoratedVisitor will invoke the decorators in order prior to invoking the visitor function passed to Visit. An error will terminate the visit.

func (DecoratedVisitor) Visit

func (v DecoratedVisitor) Visit(fn VisitorFunc) error

Visit implements Visitor

type EagerVisitorList

type EagerVisitorList []Visitor

EagerVisitorList implements Visit for the sub visitors it contains. All errors will be captured and returned at the end of iteration.

func (EagerVisitorList) Visit

func (l EagerVisitorList) Visit(fn VisitorFunc) error

Visit implements Visitor, and gathers errors that occur during processing until all sub visitors have been visited.

type ErrMatchFunc

type ErrMatchFunc func(error) bool

ErrMatchFunc can be used to filter errors that may not be true failures.

type FileVisitor

type FileVisitor struct {
	Path string
	*StreamVisitor
}

FileVisitor is wrapping around a StreamVisitor, to handle open/close files

func (*FileVisitor) Visit

func (v *FileVisitor) Visit(fn VisitorFunc) error

Visit in a FileVisitor is just taking care of opening/closing files

type FlattenListVisitor

type FlattenListVisitor struct {
	Visitor
	*Mapper
}

FlattenListVisitor flattens any objects that runtime.ExtractList recognizes as a list - has an "Items" public field that is a slice of runtime.Objects or objects satisfying that interface - into multiple Infos. An error on any sub item (for instance, if a List contains an object that does not have a registered client or resource) will terminate the visit. TODO: allow errors to be aggregated?

func (FlattenListVisitor) Visit

func (v FlattenListVisitor) Visit(fn VisitorFunc) error

type Helper

type Helper struct {
	// The name of this resource as the server would recognize it
	Resource string
	// A RESTClient capable of mutating this resource.
	RESTClient RESTClient
	// A codec for decoding and encoding objects of this resource type.
	Codec runtime.Codec
	// An interface for reading or writing the resource version of this
	// type.
	Versioner runtime.ResourceVersioner
	// True if the resource type is scoped to namespaces
	NamespaceScoped bool
}

Helper provides methods for retrieving or mutating a RESTful resource.

func NewHelper

func NewHelper(client RESTClient, mapping *meta.RESTMapping) *Helper

NewHelper creates a Helper from a ResourceMapping

func (*Helper) Create

func (m *Helper) Create(namespace string, modify bool, obj runtime.Object) (runtime.Object, error)

func (*Helper) Delete

func (m *Helper) Delete(namespace, name string) error

func (*Helper) Get

func (m *Helper) Get(namespace, name string) (runtime.Object, error)

func (*Helper) List

func (m *Helper) List(namespace, apiVersion string, selector labels.Selector) (runtime.Object, error)

TODO: add field selector

func (*Helper) Patch

func (m *Helper) Patch(namespace, name string, pt api.PatchType, data []byte) (runtime.Object, error)

func (*Helper) Replace

func (m *Helper) Replace(namespace, name string, overwrite bool, obj runtime.Object) (runtime.Object, error)

func (*Helper) Watch

func (m *Helper) Watch(namespace, resourceVersion, apiVersion string, labelSelector labels.Selector) (watch.Interface, error)

func (*Helper) WatchSingle

func (m *Helper) WatchSingle(namespace, name, resourceVersion string) (watch.Interface, error)

type Info

type Info struct {
	Client    RESTClient
	Mapping   *meta.RESTMapping
	Namespace string
	Name      string

	// Optional, Source is the filename or URL to template file (.json or .yaml),
	// or stdin to use to handle the resource
	Source string
	// Optional, this is the provided object in a versioned type before defaulting
	// and conversions into its corresponding internal type. This is useful for
	// reflecting on user intent which may be lost after defaulting and conversions.
	VersionedObject interface{}
	// Optional, this is the most recent value returned by the server if available
	runtime.Object
	// Optional, this is the most recent resource version the server knows about for
	// this type of resource. It may not match the resource version of the object,
	// but if set it should be equal to or newer than the resource version of the
	// object (however the server defines resource version).
	ResourceVersion string
}

Info contains temporary info to execute a REST call, or show the results of an already completed REST call.

func NewInfo

func NewInfo(client RESTClient, mapping *meta.RESTMapping, namespace, name string) *Info

NewInfo returns a new info object

func (*Info) Get

func (i *Info) Get() error

Get retrieves the object from the Namespace and Name fields

func (*Info) Namespaced

func (i *Info) Namespaced() bool

Namespaced returns true if the object belongs to a namespace

func (*Info) Refresh

func (i *Info) Refresh(obj runtime.Object, ignoreError bool) error

Refresh updates the object with another object. If ignoreError is set the Object will be updated even if name, namespace, or resourceVersion attributes cannot be loaded from the object.

func (*Info) ResourceMapping

func (i *Info) ResourceMapping() *meta.RESTMapping

ResourceMapping returns the mapping for this resource and implements ResourceMapping

func (*Info) Visit

func (i *Info) Visit(fn VisitorFunc) error

Visit implements Visitor

func (*Info) Watch

func (i *Info) Watch(resourceVersion string) (watch.Interface, error)

Watch returns server changes to this object after it was retrieved.

type Mapper

Mapper is a convenience struct for holding references to the three interfaces needed to create Info for arbitrary objects.

func (*Mapper) InfoForData

func (m *Mapper) InfoForData(data []byte, source string) (*Info, error)

InfoForData creates an Info object for the given data. An error is returned if any of the decoding or client lookup steps fail. Name and namespace will be set into Info if the mapping's MetadataAccessor can retrieve them.

func (*Mapper) InfoForObject

func (m *Mapper) InfoForObject(obj runtime.Object) (*Info, error)

InfoForObject creates an Info object for the given Object. An error is returned if the object cannot be introspected. Name and namespace will be set into Info if the mapping's MetadataAccessor can retrieve them.

type RESTClient

type RESTClient interface {
	Get() *client.Request
	Post() *client.Request
	Patch(api.PatchType) *client.Request
	Delete() *client.Request
	Put() *client.Request
}

RESTClient is a client helper for dealing with RESTful resources in a generic way.

type ResourceMapping

type ResourceMapping interface {
	ResourceMapping() *meta.RESTMapping
}

ResourceMapping allows an object to return the resource mapping associated with the resource or resources it represents.

type Result

type Result struct {
	// contains filtered or unexported fields
}

Result contains helper methods for dealing with the outcome of a Builder.

func (*Result) Err

func (r *Result) Err() error

Err returns one or more errors (via a util.ErrorList) that occurred prior to visiting the elements in the visitor. To see all errors including those that occur during visitation, invoke Infos().

func (*Result) IgnoreErrors

func (r *Result) IgnoreErrors(fns ...ErrMatchFunc) *Result

IgnoreErrors will filter errors that occur when by visiting the result (but not errors that occur by creating the result in the first place), eliminating any that match fns. This is best used in combination with Builder.ContinueOnError(), where the visitors accumulate errors and return them after visiting as a slice of errors. If no errors remain after filtering, the various visitor methods on Result will return nil for err.

func (*Result) Infos

func (r *Result) Infos() ([]*Info, error)

Infos returns an array of all of the resource infos retrieved via traversal. Will attempt to traverse the entire set of visitors only once, and will return a cached list on subsequent calls.

func (*Result) IntoSingular

func (r *Result) IntoSingular(b *bool) *Result

IntoSingular sets the provided boolean pointer to true if the Builder input reflected a single item, or multiple.

func (*Result) Object

func (r *Result) Object() (runtime.Object, error)

Object returns a single object representing the output of a single visit to all found resources. If the Builder was a singular context (expected to return a single resource by user input) and only a single resource was found, the resource will be returned as is. Otherwise, the returned resources will be part of an api.List. The ResourceVersion of the api.List will be set only if it is identical across all infos returned.

func (*Result) ResourceMapping

func (r *Result) ResourceMapping() (*meta.RESTMapping, error)

ResourceMapping returns a single meta.RESTMapping representing the resources located by the builder, or an error if more than one mapping was found.

func (*Result) Visit

func (r *Result) Visit(fn VisitorFunc) error

Visit implements the Visitor interface on the items described in the Builder. Note that some visitor sources are not traversable more than once, or may return different results. If you wish to operate on the same set of resources multiple times, use the Infos() method.

func (*Result) Watch

func (r *Result) Watch(resourceVersion string) (watch.Interface, error)

Watch retrieves changes that occur on the server to the specified resource. It currently supports watching a single source - if the resource source (selectors or pure types) can be watched, they will be, otherwise the list will be visited (equivalent to the Infos() call) and if there is a single resource present, it will be watched, otherwise an error will be returned.

type Selector

type Selector struct {
	Client    RESTClient
	Mapping   *meta.RESTMapping
	Namespace string
	Selector  labels.Selector
}

Selector is a Visitor for resources that match a label selector.

func NewSelector

func NewSelector(client RESTClient, mapping *meta.RESTMapping, namespace string, selector labels.Selector) *Selector

NewSelector creates a resource selector which hides details of getting items by their label selector.

func (*Selector) ResourceMapping

func (r *Selector) ResourceMapping() *meta.RESTMapping

ResourceMapping returns the mapping for this resource and implements ResourceMapping

func (*Selector) Visit

func (r *Selector) Visit(fn VisitorFunc) error

Visit implements Visitor

func (*Selector) Watch

func (r *Selector) Watch(resourceVersion string) (watch.Interface, error)

type StreamVisitor

type StreamVisitor struct {
	io.Reader
	*Mapper

	Source string
	Schema validation.Schema
}

StreamVisitor reads objects from an io.Reader and walks them. A stream visitor can only be visited once. TODO: depends on objects being in JSON format before being passed to decode - need to implement a stream decoder method on runtime.Codec to properly handle this.

func NewStreamVisitor

func NewStreamVisitor(r io.Reader, mapper *Mapper, source string, schema validation.Schema) *StreamVisitor

NewStreamVisitor is a helper function that is useful when we want to change the fields of the struct but keep calls the same.

func (*StreamVisitor) Visit

func (v *StreamVisitor) Visit(fn VisitorFunc) error

Visit implements Visitor over a stream. StreamVisitor is able to distinct multiple resources in one stream.

type URLVisitor

type URLVisitor struct {
	*Mapper
	URL    *url.URL
	Schema validation.Schema
}

URLVisitor downloads the contents of a URL, and if successful, returns an info object representing the downloaded object.

func (*URLVisitor) Visit

func (v *URLVisitor) Visit(fn VisitorFunc) error

type Visitor

type Visitor interface {
	Visit(VisitorFunc) error
}

Visitor lets clients walk a list of resources.

func ExpandPathsToFileVisitors

func ExpandPathsToFileVisitors(mapper *Mapper, paths string, recursive bool, extensions []string, schema validation.Schema) ([]Visitor, error)

ExpandPathsToFileVisitors will return a slice of FileVisitors that will handle files from the provided path. After FileVisitors open the files, they will pass a io.Reader to a StreamVisitor to do the reading. (stdin is also taken care of). Paths argument also accepts a single file, and will return a single visitor

func FileVisitorForSTDIN

func FileVisitorForSTDIN(mapper *Mapper, schema validation.Schema) Visitor

FileVisitorForSTDIN return a special FileVisitor just for STDIN

func NewDecoratedVisitor

func NewDecoratedVisitor(v Visitor, fn ...VisitorFunc) Visitor

NewDecoratedVisitor will create a visitor that invokes the provided visitor functions before the user supplied visitor function is invoked, giving them the opportunity to mutate the Info object or terminate early with an error.

func NewFlattenListVisitor

func NewFlattenListVisitor(v Visitor, mapper *Mapper) Visitor

NewFlattenListVisitor creates a visitor that will expand list style runtime.Objects into individual items and then visit them individually.

type VisitorFunc

type VisitorFunc func(*Info, error) error

VisitorFunc implements the Visitor interface for a matching function. If there was a problem walking a list of resources, the incoming error will describe the problem and the function can decide how to handle that error. A nil returned indicates to accept an error to continue loops even when errors happen. This is useful for ignoring certain kinds of errors or aggregating errors in some way.

func RequireNamespace

func RequireNamespace(namespace string) VisitorFunc

RequireNamespace will either set a namespace if none is provided on the Info object, or if the namespace is set and does not match the provided value, returns an error. This is intended to guard against administrators accidentally operating on resources outside their namespace.

func SetNamespace

func SetNamespace(namespace string) VisitorFunc

SetNamespace ensures that every Info object visited will have a namespace set. If info.Object is set, it will be mutated as well.

type VisitorList

type VisitorList []Visitor

VisitorList implements Visit for the sub visitors it contains. The first error returned from a child Visitor will terminate iteration.

func (VisitorList) Visit

func (l VisitorList) Visit(fn VisitorFunc) error

Visit implements Visitor

type Watchable

type Watchable interface {
	Watch(resourceVersion string) (watch.Interface, error)
}

Watchable describes a resource that can be watched for changes that occur on the server, beginning after the provided resource version.

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