callbacks

Documentation

Index

• Constants
• Variables
• func MachineCollection(tree *hsm.Node) hsm.Collection[Callback]
• func NewWorkflowClosedTrigger() *persistencespb.CallbackInfo_Trigger
• func RegisterExecutor(registry *hsm.Registry, executorOptions TaskExecutorOptions) error
• func RegisterStateMachine(r *hsm.Registry) error
• func RegisterTaskSerializers(reg *hsm.Registry) error
• type AddressMatchRule
• type BackoffTask
  • func (BackoffTask) Concurrent() bool
  • func (t BackoffTask) Kind() hsm.TaskKind
  • func (BackoffTask) Type() string
• type BackoffTaskSerializer
  • func (BackoffTaskSerializer) Deserialize(data []byte, kind hsm.TaskKind) (hsm.Task, error)
  • func (BackoffTaskSerializer) Serialize(hsm.Task) ([]byte, error)
• type Callback
  • func NewCallback(registrationTime *timestamppb.Timestamp, ...) Callback
  • func (c Callback) RegenerateTasks(*hsm.Node) ([]hsm.Task, error)
  • func (c Callback) SetState(state enumsspb.CallbackState)
  • func (c Callback) State() enumsspb.CallbackState
• type CanGetNexusCompletion
• type Config
  • func ConfigProvider(dc *dynamicconfig.Collection) *Config
• type EventAttemptFailed
• type EventFailed
• type EventRescheduled
• type EventScheduled
• type EventSucceeded
• type HTTPCaller
• type HTTPCallerProvider
  • func HTTPCallerProviderProvider(clusterMetadata cluster.Metadata, rpcFactory common.RPCFactory, ...) (HTTPCallerProvider, error)
• type InvocationTask
  • func (InvocationTask) Concurrent() bool
  • func (t InvocationTask) Kind() hsm.TaskKind
  • func (InvocationTask) Type() string
• type InvocationTaskSerializer
  • func (InvocationTaskSerializer) Deserialize(data []byte, kind hsm.TaskKind) (hsm.Task, error)
  • func (InvocationTaskSerializer) Serialize(hsm.Task) ([]byte, error)
• type TaskExecutorOptions

Constants

const (
	TaskTypeInvocation = "callbacks.Invocation"
	TaskTypeBackoff    = "callbacks.Backoff"
)

const (
	// StateMachineType is a unique type identifier for this state machine.
	StateMachineType = "callbacks.Callback"
)

Variables

var AllowedAddresses = dynamicconfig.NewNamespaceTypedSettingWithConverter(
	"component.callbacks.allowedAddresses",
	allowedAddressConverter,
	[]AddressMatchRule(nil),
	`The per-namespace list of addresses that are allowed for callbacks and whether secure connections (https) are required.
URLs are checked against each in order when starting a workflow with attached callbacks and only need to match one to pass validation.
Default is no address rules, meaning all callbacks will be rejected. Any invalid entries are ignored. Each entry is a map with possible values:
	 - "Pattern":string (required) the host:port pattern to which this config applies.
		Wildcards, '*', are supported and can match any number of characters (e.g. '*' matches everything, 'prefix.*.domain' matches 'prefix.a.domain' as well as 'prefix.a.b.domain').
	 - "AllowInsecure":bool (optional, default=false) indicates whether https is required`)

var Module = fx.Module(
	"component.callbacks",
	fx.Provide(ConfigProvider),
	fx.Provide(HTTPCallerProviderProvider),
	fx.Invoke(RegisterTaskSerializers),
	fx.Invoke(RegisterStateMachine),
	fx.Invoke(RegisterExecutor),
)

var RequestCounter = metrics.NewCounterDef(
	"callback_outbound_requests",
	metrics.WithDescription("The number of callback outbound requests made by the history service."),
)

var RequestLatencyHistogram = metrics.NewTimerDef(
	"callback_outbound_latency",
	metrics.WithDescription("Latency histogram of outbound callback requests made by the history service."),
)

var RequestTimeout = dynamicconfig.NewDestinationDurationSetting(
	"component.callbacks.request.timeout",
	time.Second*10,
	`RequestTimeout is the timeout for executing a single callback request.`,
)

var RetryPolicyInitialInterval = dynamicconfig.NewGlobalDurationSetting(
	"component.callbacks.retryPolicy.initialInterval",
	time.Second,
	`The initial backoff interval between every callback request attempt for a given callback.`,
)

var RetryPolicyMaximumInterval = dynamicconfig.NewGlobalDurationSetting(
	"component.callbacks.retryPolicy.maxInterval",
	time.Hour,
	`The maximum backoff interval between every callback request attempt for a given callback.`,
)

var TransitionAttemptFailed = hsm.NewTransition(
	[]enumsspb.CallbackState{enumsspb.CALLBACK_STATE_SCHEDULED},
	enumsspb.CALLBACK_STATE_BACKING_OFF,
	func(cb Callback, event EventAttemptFailed) (hsm.TransitionOutput, error) {
		cb.recordAttempt(event.Time)

		nextDelay := event.RetryPolicy.ComputeNextDelay(0, int(cb.Attempt), event.Err)
		nextAttemptScheduleTime := event.Time.Add(nextDelay)
		cb.CallbackInfo.NextAttemptScheduleTime = timestamppb.New(nextAttemptScheduleTime)
		cb.CallbackInfo.LastAttemptFailure = &failurepb.Failure{
			Message: event.Err.Error(),
			FailureInfo: &failurepb.Failure_ApplicationFailureInfo{
				ApplicationFailureInfo: &failurepb.ApplicationFailureInfo{
					NonRetryable: false,
				},
			},
		}
		return cb.output()
	},
)

var TransitionFailed = hsm.NewTransition(
	[]enumsspb.CallbackState{enumsspb.CALLBACK_STATE_SCHEDULED},
	enumsspb.CALLBACK_STATE_FAILED,
	func(cb Callback, event EventFailed) (hsm.TransitionOutput, error) {
		cb.recordAttempt(event.Time)
		cb.CallbackInfo.LastAttemptFailure = &failurepb.Failure{
			Message: event.Err.Error(),
			FailureInfo: &failurepb.Failure_ApplicationFailureInfo{
				ApplicationFailureInfo: &failurepb.ApplicationFailureInfo{
					NonRetryable: true,
				},
			},
		}
		return cb.output()
	},
)

var TransitionRescheduled = hsm.NewTransition(
	[]enumsspb.CallbackState{enumsspb.CALLBACK_STATE_BACKING_OFF},
	enumsspb.CALLBACK_STATE_SCHEDULED,
	func(cb Callback, event EventRescheduled) (hsm.TransitionOutput, error) {
		cb.CallbackInfo.NextAttemptScheduleTime = nil
		return cb.output()
	},
)

var TransitionScheduled = hsm.NewTransition(
	[]enumsspb.CallbackState{enumsspb.CALLBACK_STATE_STANDBY},
	enumsspb.CALLBACK_STATE_SCHEDULED,
	func(cb Callback, event EventScheduled) (hsm.TransitionOutput, error) {
		return cb.output()
	},
)

var TransitionSucceeded = hsm.NewTransition(
	[]enumsspb.CallbackState{enumsspb.CALLBACK_STATE_SCHEDULED},
	enumsspb.CALLBACK_STATE_SUCCEEDED,
	func(cb Callback, event EventSucceeded) (hsm.TransitionOutput, error) {
		cb.recordAttempt(event.Time)
		cb.CallbackInfo.LastAttemptFailure = nil
		return cb.output()
	},
)

Functions

func MachineCollection

func MachineCollection(tree *hsm.Node) hsm.Collection[Callback]

MachineCollection creates a new typed [statemachines.Collection] for callbacks.

func NewWorkflowClosedTrigger

func NewWorkflowClosedTrigger() *persistencespb.CallbackInfo_Trigger

NewWorkflowClosedTrigger creates a WorkflowClosed trigger variant.

func RegisterExecutor

func RegisterExecutor(
	registry *hsm.Registry,
	executorOptions TaskExecutorOptions,
) error

func RegisterStateMachine

func RegisterStateMachine(r *hsm.Registry) error

func RegisterTaskSerializers

func RegisterTaskSerializers(reg *hsm.Registry) error

Types

type AddressMatchRule

type AddressMatchRule struct {
	Regexp        *regexp.Regexp
	AllowInsecure bool
}

type BackoffTask

type BackoffTask struct {
	Deadline time.Time
}

func (BackoffTask) Concurrent

func (BackoffTask) Concurrent() bool

func (BackoffTask) Kind

func (t BackoffTask) Kind() hsm.TaskKind

func (BackoffTask) Type

func (BackoffTask) Type() string

type BackoffTaskSerializer

type BackoffTaskSerializer struct{}

func (BackoffTaskSerializer) Deserialize

func (BackoffTaskSerializer) Deserialize(data []byte, kind hsm.TaskKind) (hsm.Task, error)

func (BackoffTaskSerializer) Serialize

func (BackoffTaskSerializer) Serialize(hsm.Task) ([]byte, error)

type Callback

type Callback struct {
	*persistencespb.CallbackInfo
}

Callback state machine.

func NewCallback

func NewCallback(registrationTime *timestamppb.Timestamp, trigger *persistencespb.CallbackInfo_Trigger, cb *persistencespb.Callback) Callback

NewCallback creates a new callback in the STANDBY state from given params.

func (Callback) RegenerateTasks

func (c Callback) RegenerateTasks(*hsm.Node) ([]hsm.Task, error)

func (Callback) SetState

func (c Callback) SetState(state enumsspb.CallbackState)

func (Callback) State

func (c Callback) State() enumsspb.CallbackState

type CanGetNexusCompletion

type CanGetNexusCompletion interface {
	GetNexusCompletion(ctx context.Context) (nexus.OperationCompletion, error)
}

type Config

type Config struct {
	RequestTimeout dynamicconfig.DurationPropertyFnWithDestinationFilter
	RetryPolicy    func() backoff.RetryPolicy
}

func ConfigProvider

func ConfigProvider(dc *dynamicconfig.Collection) *Config

type EventAttemptFailed

type EventAttemptFailed struct {
	Time        time.Time
	Err         error
	RetryPolicy backoff.RetryPolicy
}

EventAttemptFailed is triggered when an attempt is failed with a retryable error.

type EventFailed

type EventFailed struct {
	Time time.Time
	Err  error
}

EventFailed is triggered when an attempt is failed with a non retryable error.

type EventRescheduled

type EventRescheduled struct{}

EventRescheduled is triggered when the callback is meant to be rescheduled after backing off from a previous attempt.

type EventScheduled

type EventScheduled struct{}

EventScheduled is triggered when the callback is meant to be scheduled for the first time - when its Trigger condition is met.

type EventSucceeded

type EventSucceeded struct {
	Time time.Time
}

EventSucceeded is triggered when an attempt succeeds.

type HTTPCaller

type HTTPCaller func(*http.Request) (*http.Response, error)

HTTPCaller is a method that can be used to invoke HTTP requests.

type HTTPCallerProvider

type HTTPCallerProvider func(queues.NamespaceIDAndDestination) HTTPCaller

func HTTPCallerProviderProvider

func HTTPCallerProviderProvider(
	clusterMetadata cluster.Metadata,
	rpcFactory common.RPCFactory,
	httpClientCache *cluster.FrontendHTTPClientCache,
	logger log.Logger,
) (HTTPCallerProvider, error)

type InvocationTask

type InvocationTask struct {
	// The base URL for nexus callbacks.
	// Will have other meanings as more callback use cases are added.
	Destination string
}

func (InvocationTask) Concurrent

func (InvocationTask) Concurrent() bool

func (InvocationTask) Kind

func (t InvocationTask) Kind() hsm.TaskKind

func (InvocationTask) Type

func (InvocationTask) Type() string

type InvocationTaskSerializer

type InvocationTaskSerializer struct{}

func (InvocationTaskSerializer) Deserialize

func (InvocationTaskSerializer) Deserialize(data []byte, kind hsm.TaskKind) (hsm.Task, error)

func (InvocationTaskSerializer) Serialize

func (InvocationTaskSerializer) Serialize(hsm.Task) ([]byte, error)

type TaskExecutorOptions

type TaskExecutorOptions struct {
	fx.In

	Config            *Config
	NamespaceRegistry namespace.Registry
	MetricsHandler    metrics.Handler
	Logger            log.Logger
	CallerProvider    HTTPCallerProvider
}