command

package
v0.32.2 Latest Latest
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 Go to latest Published: Feb 10, 2024 License: Apache-2.0 Imports: 20 Imported by: 1

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Constants

View Source 
const (
	MetricCommandLimiterCurrentQueuedCount = "command.limiter.queued_count"
	MetricCommandLimiterWorkTimer          = "command.limiter.work_timer"

	DefaultLimiterSize = 100
	MinLimiterSize     = 10
)

Variables

This section is empty.

Functions

func WasRateLimited added in v0.32.2 

func WasRateLimited(err error) bool

Types

type AdaptiveRateLimiter added in v0.32.0 

type AdaptiveRateLimiter interface {
	RunRateLimited(f func() error) (RateLimitControl, error)
}

An AdaptiveRateLimiter allows running arbitrary, sequential operations with a limiter, so that only N operations can be queued to run at any given time. If the system is too busy, the rate limiter will return an ApiError indicating that the server is too busy.

The rate limiter returns a RateLimitControl, allow the calling code to indicate if the operation finished in time. If operations are timing out before the results are available, the rate limiter should allow fewer operations in, as they will likely time out before the results can be used.

The rate limiter doesn't have a set queue size, it has a window which can grow and shrink. When a timeout is signaled, using the RateLimitControl, it shrinks the window based on queue position of the timed out operation. For example, if an operation was queued at position 200, but the times out, we assume that we need to limit the queue size to something less than 200 for now.

The limiter will also reject already queued operations if the window size changes and the operation was queued at a position larger than the current window size.

The window size will slowly grow back towards the max as successes are noted in the RateLimitControl.

func NewAdaptiveRateLimiter added in v0.32.0 

func NewAdaptiveRateLimiter(config AdaptiveRateLimiterConfig, registry metrics.Registry, closeNotify <-chan struct{}) AdaptiveRateLimiter

type AdaptiveRateLimiterConfig added in v0.32.0 

type AdaptiveRateLimiterConfig struct {
	// Enabled - if false, a no-op rate limiter will be created, which doesn't enforce any rate limiting
	Enabled bool

	// MaxSize - the maximum window size to allow
	MaxSize uint32

	// MinSize - the smallest window size to allow
	MinSize uint32

	// WorkTimerMetric - the name of the timer metric for timing how long operations take to execute
	WorkTimerMetric string

	// QueueSize - the name of the gauge metric showing the current number of operations queued
	QueueSizeMetric string

	// WindowSizeMetric - the name of the metric show the current window size
	WindowSizeMetric string
}

AdaptiveRateLimiterConfig contains configuration values used to create a new AdaptiveRateLimiter

func (*AdaptiveRateLimiterConfig) Validate added in v0.32.0 

func (self *AdaptiveRateLimiterConfig) Validate() error

type Command 

type Command interface {
	// Apply runs the commands
	Apply(ctx boltz.MutateContext) error

	// GetChangeContext returns the change context associated with the command
	GetChangeContext() *change.Context

	// Encode returns a serialized representation of the command
	Encode() ([]byte, error)
}

Command instances represent actions to be taken by the fabric controller. They are serializable, so they can be shipped from one controller for RAFT coordination

type CreateEntityCommand 

type CreateEntityCommand[T models.Entity] struct {
	Context        *change.Context
	Creator        EntityCreator[T]
	Entity         T
	PostCreateHook func(ctx boltz.MutateContext, entity T) error
	Flags          uint32
}

func (*CreateEntityCommand[T]) Apply 

func (self *CreateEntityCommand[T]) Apply(ctx boltz.MutateContext) error

func (*CreateEntityCommand[T]) Encode 

func (self *CreateEntityCommand[T]) Encode() ([]byte, error)

func (*CreateEntityCommand[T]) GetChangeContext 

func (self *CreateEntityCommand[T]) GetChangeContext() *change.Context

type Decoder 

type Decoder interface {
	Decode(commandType int32, data []byte) (Command, error)
}

Decoder instances know how to decode encoded commands

type DecoderF 

type DecoderF func(commandType int32, data []byte) (Command, error)

DecoderF is a function version of the Decoder interface

func (DecoderF) Decode 

func (self DecoderF) Decode(commandType int32, data []byte) (Command, error)

type Decoders 

type Decoders interface {
	Register(id int32, decoder Decoder)
	RegisterF(id int32, decoder DecoderF)
	Decode(data []byte) (Command, error)
	GetDecoder(id int32) Decoder
	Clear()
}

func GetDefaultDecoders 

func GetDefaultDecoders() Decoders

func NewDecoders 

func NewDecoders() Decoders

type DefaultRateLimiter added in v0.31.0 

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

func (*DefaultRateLimiter) RunRateLimited added in v0.31.0 

func (self *DefaultRateLimiter) RunRateLimited(f func() error) error

type DeleteEntityCommand 

type DeleteEntityCommand struct {
	Context *change.Context
	Deleter EntityDeleter
	Id      string
}

func (*DeleteEntityCommand) Apply 

func (self *DeleteEntityCommand) Apply(ctx boltz.MutateContext) error

func (*DeleteEntityCommand) Encode 

func (self *DeleteEntityCommand) Encode() ([]byte, error)

func (*DeleteEntityCommand) GetChangeContext 

func (self *DeleteEntityCommand) GetChangeContext() *change.Context

type Dispatcher 

type Dispatcher interface {
	Dispatch(command Command) error
	IsLeaderOrLeaderless() bool
	GetPeers() map[string]channel.Channel
}

Dispatcher instances will take a command and either send it to the leader to be applied, or if the current system is the leader, apply it locally

type EntityCreator 

type EntityCreator[T models.Entity] interface {
	EntityMarshaller[T]

	// ApplyCreate creates the entity described by the given command
	ApplyCreate(cmd *CreateEntityCommand[T], ctx boltz.MutateContext) error
}

EntityCreator instances can apply a create entity command to create entities of a given type

type EntityDeleter 

type EntityDeleter interface {
	GetEntityTypeId() string

	// ApplyDelete deletes the entity described by the given command
	ApplyDelete(cmd *DeleteEntityCommand, ctx boltz.MutateContext) error
}

EntityDeleter instances can apply a delete entity command to delete entities of a given type

type EntityManager 

type EntityManager[T models.Entity] interface {
	EntityCreator[T]
	EntityUpdater[T]
	EntityDeleter
}

EntityManager instances can handle create, update and delete entities of a specific type

type EntityMarshaller 

type EntityMarshaller[T any] interface {
	// GetEntityTypeId returns the entity type id. This is distinct from the Store entity id
	// which may be shared by types, such as service and router. The entity type is unique
	// for each type
	GetEntityTypeId() string

	// Marshall marshals the entity to a bytes encoded format
	Marshall(entity T) ([]byte, error)

	// Unmarshall unmarshalls the bytes back into an entity
	Unmarshall(bytes []byte) (T, error)
}

EntityMarshaller instances can marshal and unmarshal entities of the type that they manage as well as knowing their entity type

type EntityUpdater 

type EntityUpdater[T models.Entity] interface {
	EntityMarshaller[T]

	// ApplyUpdate updates the entity described by the given command
	ApplyUpdate(cmd *UpdateEntityCommand[T], ctx boltz.MutateContext) error
}

EntityUpdater instances can apply an update entity command to update entities of a given type

type LocalDispatcher 

type LocalDispatcher struct {
	EncodeDecodeCommands bool
	Limiter              RateLimiter
}

LocalDispatcher should be used when running a non-clustered system

func (*LocalDispatcher) Dispatch 

func (self *LocalDispatcher) Dispatch(command Command) error

func (*LocalDispatcher) GetPeers 

func (self *LocalDispatcher) GetPeers() map[string]channel.Channel

func (*LocalDispatcher) IsLeaderOrLeaderless 

func (self *LocalDispatcher) IsLeaderOrLeaderless() bool

type NoOpAdaptiveRateLimiter added in v0.32.0 

type NoOpAdaptiveRateLimiter struct{}

func (NoOpAdaptiveRateLimiter) RunRateLimited added in v0.32.0 

func (self NoOpAdaptiveRateLimiter) RunRateLimited(f func() error) (RateLimitControl, error)

type NoOpRateLimiter added in v0.31.0 

type NoOpRateLimiter struct{}

func (NoOpRateLimiter) RunRateLimited added in v0.31.0 

func (self NoOpRateLimiter) RunRateLimited(f func() error) error

type RateLimitControl added in v0.32.0 

type RateLimitControl interface {
	Success()
	Timeout()
}

type RateLimiter added in v0.31.0 

type RateLimiter interface {
	RunRateLimited(func() error) error
}

A RateLimiter allows running arbitrary, sequential operations with a limiter, so that only N operations can be queued to run at any given time. If the system is too busy, the rate limiter will return an ApiError indicating that the server is too busy

func NewRateLimiter added in v0.31.0 

func NewRateLimiter(config RateLimiterConfig, registry metrics.Registry, closeNotify <-chan struct{}) RateLimiter

type RateLimiterConfig added in v0.31.0 

type RateLimiterConfig struct {
	Enabled   bool
	QueueSize uint32
}

type SyncSnapshotCommand 

type SyncSnapshotCommand struct {
	SnapshotId   string
	Snapshot     []byte
	SnapshotSink func(cmd *SyncSnapshotCommand) error
}

func (*SyncSnapshotCommand) Apply 

func (self *SyncSnapshotCommand) Apply(boltz.MutateContext) error

func (*SyncSnapshotCommand) Encode 

func (self *SyncSnapshotCommand) Encode() ([]byte, error)

func (*SyncSnapshotCommand) GetChangeContext 

func (self *SyncSnapshotCommand) GetChangeContext() *change.Context

type UpdateEntityCommand 

type UpdateEntityCommand[T models.Entity] struct {
	Context       *change.Context
	Updater       EntityUpdater[T]
	Entity        T
	UpdatedFields fields.UpdatedFields
	Flags         uint32
}

func (*UpdateEntityCommand[T]) Apply 

func (self *UpdateEntityCommand[T]) Apply(ctx boltz.MutateContext) error

func (*UpdateEntityCommand[T]) Encode 

func (self *UpdateEntityCommand[T]) Encode() ([]byte, error)

func (*UpdateEntityCommand[T]) GetChangeContext 

func (self *UpdateEntityCommand[T]) GetChangeContext() *change.Context

type Validatable 

type Validatable interface {
	Validate() error
}

Validatable instances can be validated. Command instances which implement Validable will be validated before Command.Apply is called

Source Files

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