inmem

Documentation

Overview

Package inmem provides an implementation of state.State in memory.

Index

• Variables
• func Build(ns resource.Namespace) state.CoreState
• func ErrAlreadyExists(r resource.Reference) error
• func ErrNotFound(r resource.Pointer) error
• func ErrOwnerConflict(r resource.Reference, owner string) error
• func ErrPendingFinalizers(r resource.Metadata) error
• func ErrPhaseConflict(r resource.Reference, expectedPhase resource.Phase) error
• func ErrUpdateSameVersion(r resource.Reference, version resource.Version) error
• func ErrVersionConflict(r resource.Reference, expected, found resource.Version) error
• func NewStateWithOptions(opts ...StateOption) func(ns resource.Namespace) *State
• type BackingStore
• type LoadHandler
• type ResourceCollection
  • func NewResourceCollection(ns resource.Namespace, typ resource.Type, capacity, gap int, ...) *ResourceCollection
  • func (collection *ResourceCollection) Create(ctx context.Context, res resource.Resource, owner string) error
  • func (collection *ResourceCollection) Destroy(ctx context.Context, ptr resource.Pointer, owner string) error
  • func (collection *ResourceCollection) Get(resourceID resource.ID) (resource.Resource, error)
  • func (collection *ResourceCollection) List(options *state.ListOptions) (resource.List, error)
  • func (collection *ResourceCollection) Update(ctx context.Context, newResource resource.Resource, ...) error
  • func (collection *ResourceCollection) Watch(ctx context.Context, id resource.ID, ch chan<- state.Event, ...) error
  • func (collection *ResourceCollection) WatchAll(ctx context.Context, ch chan<- state.Event, opts ...state.WatchKindOption) error
• type State
  • func (st *State) Create(ctx context.Context, resource resource.Resource, opts ...state.CreateOption) error
  • func (st *State) Destroy(ctx context.Context, resourcePointer resource.Pointer, ...) error
  • func (st *State) Get(ctx context.Context, resourcePointer resource.Pointer, opts ...state.GetOption) (resource.Resource, error)
  • func (st *State) List(ctx context.Context, resourceKind resource.Kind, opts ...state.ListOption) (resource.List, error)
  • func (st *State) Update(ctx context.Context, newResource resource.Resource, opts ...state.UpdateOption) error
  • func (st *State) Watch(ctx context.Context, resourcePointer resource.Pointer, ch chan<- state.Event, ...) error
  • func (st *State) WatchKind(ctx context.Context, resourceKind resource.Kind, ch chan<- state.Event, ...) error
• type StateOption
  • func WithBackingStore(store BackingStore) StateOption
  • func WithHistoryCapacity(capacity int) StateOption
  • func WithHistoryGap(gap int) StateOption
• type StateOptions
  • func DefaultStateOptions() StateOptions

Variables

var NewState = NewStateWithOptions()

NewState creates new State with default options.

Functions

func Build

func Build(ns resource.Namespace) state.CoreState

Build a local state for namespace.

func ErrAlreadyExists

func ErrAlreadyExists(r resource.Reference) error

ErrAlreadyExists generates error compatible with state.ErrConflict.

func ErrNotFound

func ErrNotFound(r resource.Pointer) error

ErrNotFound generates error compatible with state.ErrNotFound.

func ErrOwnerConflict

func ErrOwnerConflict(r resource.Reference, owner string) error

ErrOwnerConflict generates error compatible with state.ErrConflict.

func ErrPendingFinalizers

func ErrPendingFinalizers(r resource.Metadata) error

ErrPendingFinalizers generates error compatible with state.ErrConflict.

func ErrPhaseConflict

func ErrPhaseConflict(r resource.Reference, expectedPhase resource.Phase) error

ErrPhaseConflict generates error compatible with ErrConflict.

func ErrUpdateSameVersion

func ErrUpdateSameVersion(r resource.Reference, version resource.Version) error

ErrUpdateSameVersion generates error compatible with state.ErrConflict.

func ErrVersionConflict

func ErrVersionConflict(r resource.Reference, expected, found resource.Version) error

ErrVersionConflict generates error compatible with state.ErrConflict.

func NewStateWithOptions

func NewStateWithOptions(opts ...StateOption) func(ns resource.Namespace) *State

NewStateWithOptions returns state builder function with options.

Types

type BackingStore

type BackingStore interface {
	// Load contents of the backing store into the in-memory resource collection.
	//
	// Handler should be called for each resource in the backing store.
	Load(ctx context.Context, handler LoadHandler) error
	// Put the resource to the backing store.
	Put(ctx context.Context, resourceType resource.Type, resource resource.Resource) error
	// Destroy the resource from the backing store.
	Destroy(ctx context.Context, resourceType resource.Type, resourcePointer resource.Pointer) error
}

BackingStore provides a way to persist contents of in-memory resource collection.

All resources are still kept in memory, but the backing store is used to persist the resources across process restarts.

BackingStore is responsible for marshaling/unmarshaling of resources.

BackingStore is optional for in-memory resource collection.

type LoadHandler

type LoadHandler func(resourceType resource.Type, resource resource.Resource) error

LoadHandler is called for each resource loaded from the backing store.

type ResourceCollection

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

ResourceCollection implements slice of State (by resource type).

func NewResourceCollection

func NewResourceCollection(ns resource.Namespace, typ resource.Type, capacity, gap int, store BackingStore) *ResourceCollection

NewResourceCollection returns new ResourceCollection.

func (*ResourceCollection) Create

func (collection *ResourceCollection) Create(ctx context.Context, res resource.Resource, owner string) error

Create a resource.

func (*ResourceCollection) Destroy

func (collection *ResourceCollection) Destroy(ctx context.Context, ptr resource.Pointer, owner string) error

Destroy a resource.

func (*ResourceCollection) Get

func (collection *ResourceCollection) Get(resourceID resource.ID) (resource.Resource, error)

Get a resource.

func (*ResourceCollection) List

func (collection *ResourceCollection) List(options *state.ListOptions) (resource.List, error)

List resources.

func (*ResourceCollection) Update

func (collection *ResourceCollection) Update(ctx context.Context, newResource resource.Resource, options *state.UpdateOptions) error

Update a resource.

func (*ResourceCollection) Watch

func (collection *ResourceCollection) Watch(ctx context.Context, id resource.ID, ch chan<- state.Event, opts ...state.WatchOption) error

Watch for specific resource changes.

func (*ResourceCollection) WatchAll

func (collection *ResourceCollection) WatchAll(ctx context.Context, ch chan<- state.Event, opts ...state.WatchKindOption) error

WatchAll for any resource change stored in this collection.

type State

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

State implements state.CoreState.

func (*State) Create

func (st *State) Create(ctx context.Context, resource resource.Resource, opts ...state.CreateOption) error

Create a resource.

func (*State) Destroy

func (st *State) Destroy(ctx context.Context, resourcePointer resource.Pointer, opts ...state.DestroyOption) error

Destroy a resource.

func (*State) Get

func (st *State) Get(ctx context.Context, resourcePointer resource.Pointer, opts ...state.GetOption) (resource.Resource, error)

Get a resource.

func (*State) List

func (st *State) List(ctx context.Context, resourceKind resource.Kind, opts ...state.ListOption) (resource.List, error)

List resources.

func (*State) Update

func (st *State) Update(ctx context.Context, newResource resource.Resource, opts ...state.UpdateOption) error

Update a resource.

func (*State) Watch

func (st *State) Watch(ctx context.Context, resourcePointer resource.Pointer, ch chan<- state.Event, opts ...state.WatchOption) error

Watch a resource.

func (*State) WatchKind

func (st *State) WatchKind(ctx context.Context, resourceKind resource.Kind, ch chan<- state.Event, opts ...state.WatchKindOption) error

WatchKind all resources by type.

type StateOption

type StateOption func(options *StateOptions)

StateOption applies settings to StateOptions.

func WithBackingStore

func WithBackingStore(store BackingStore) StateOption

WithBackingStore sets a BackingStore for a in-memory resource collection.

Default value is nil (no backing store).

func WithHistoryCapacity

func WithHistoryCapacity(capacity int) StateOption

WithHistoryCapacity sets history depth for a given namspace and resource.

Deep history requires more memory, but allows Watch request to return more historical entries, and also acts like a buffer if watch consumer can't keep up with events.

func WithHistoryGap

func WithHistoryGap(gap int) StateOption

WithHistoryGap sets a safety gap between watch events consumers and events producers.

Bigger gap reduces effective history depth (HistoryCapacity - HistoryGap). Smaller gap might result in buffer overruns if consumer can't keep up with the events. It's recommended to have gap 5% of the capacity.

type StateOptions

type StateOptions struct {
	BackingStore    BackingStore
	HistoryCapacity int
	HistoryGap      int
}

StateOptions configure inmem.State.

func DefaultStateOptions

func DefaultStateOptions() StateOptions

DefaultStateOptions returns default value of StateOptions.