internal

package
v0.9.2 Latest Latest
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 Go to latest Published: Oct 4, 2019 License: MIT Imports: 43 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	// QueryTypeStackTrace is the build in query type for Client.QueryWorkflow() call. Use this query type to get the call
	// stack of the workflow. The result will be a string encoded in the EncodedValue.
	QueryTypeStackTrace string = "__stack_trace"

	// QueryTypeOpenSessions is the build in query type for Client.QueryWorkflow() call. Use this query type to get all open
	// sessions in the workflow. The result will be a list of SessionInfo encoded in the EncodedValue.
	QueryTypeOpenSessions string = "__open_sessions"
)
View Source 
const FeatureVersion = "1.2.0"

FeatureVersion is a semver that represents the feature set of this cadence client library support. This can be used for client capability check, on Cadence server, for backward compatibility Format: MAJOR.MINOR.PATCH

View Source 
const LibraryVersion = "0.8.3"

LibraryVersion is a semver that represents the version of this cadence client library. This represents API changes visible to Cadence client side library consumers, i.e. developers that are writing workflows. So every time we change API that can affect them we have to change this number. Format: MAJOR.MINOR.PATCH

Variables

View Source 
var DefaultDataConverter = getDefaultDataConverter()

DefaultDataConverter is default data converter used by Cadence worker

View Source 
var ErrActivityResultPending = errors.New("not error: do not autocomplete, using Client.CompleteActivity() to complete")

ErrActivityResultPending is returned from activity's implementation to indicate the activity is not completed when activity method returns. Activity needs to be completed by Client.CompleteActivity() separately. For example, if an activity require human interaction (like approve an expense report), the activity could return activity.ErrResultPending which indicate the activity is not done yet. Then, when the waited human action happened, it needs to trigger something that could report the activity completed event to cadence server via Client.CompleteActivity() API.

View Source 
var ErrCanceled = NewCanceledError()

ErrCanceled is the error returned by Context.Err when the context is canceled.

View Source 
var ErrDeadlineExceeded = NewTimeoutError(shared.TimeoutTypeScheduleToClose)

ErrDeadlineExceeded is the error returned by Context.Err when the context's deadline passes.

View Source 
var ErrMockStartChildWorkflowFailed = fmt.Errorf("start child workflow failed: %v", shared.ChildWorkflowExecutionFailedCauseWorkflowAlreadyRunning)

ErrMockStartChildWorkflowFailed is special error used to indicate the mocked child workflow should fail to start. This error is also exposed as public as testsuite.ErrMockStartChildWorkflowFailed

View Source 
var ErrNoData = errors.New("no data available")

ErrNoData is returned when trying to extract strong typed data while there is no data available.

View Source 
var (
	// ErrSessionFailed is the error returned when user tries to execute an activity but the
	// session it belongs to has already failed
	ErrSessionFailed = errors.New("session has failed")
)
View Source 
var ErrTooManyArg = errors.New("too many arguments")

ErrTooManyArg is returned when trying to extract strong typed data with more arguments than available data.

Functions

func CompleteSession added in v0.8.4 

func CompleteSession(ctx Context)

CompleteSession completes a session. It releases worker resources, so other sessions can be created. CompleteSession won't do anything if the context passed in doesn't contain any session information or the session has already completed or failed.

After a session has completed, user can continue to use the context, but the activities will be scheduled on the normal taskList (as user specified in ActivityOptions) and may be picked up by another worker since it's not in a session.

func EnableVerboseLogging 

func EnableVerboseLogging(enable bool)

EnableVerboseLogging enable or disable verbose logging. This is for internal use only.

func GetActivityLogger 

func GetActivityLogger(ctx context.Context) *zap.Logger

GetActivityLogger returns a logger that can be used in activity

func GetActivityMetricsScope 

func GetActivityMetricsScope(ctx context.Context) tally.Scope

GetActivityMetricsScope returns a metrics scope that can be used in activity

func GetHeartbeatDetails added in v0.7.5 

func GetHeartbeatDetails(ctx context.Context, d ...interface{}) error

GetHeartbeatDetails extract heartbeat details from last failed attempt. This is used in combination with retry policy. An activity could be scheduled with an optional retry policy on ActivityOptions. If the activity failed then server would attempt to dispatch another activity task to retry according to the retry policy. If there was heartbeat details reported by activity from the failed attempt, the details would be delivered along with the activity task for retry attempt. Activity could extract the details by GetHeartbeatDetails() and resume from the progress.

func GetLastCompletionResult added in v0.8.0 

func GetLastCompletionResult(ctx Context, d ...interface{}) error

GetLastCompletionResult extract last completion result from previous run for this cron workflow. This is used in combination with cron schedule. A workflow can be started with an optional cron schedule. If a cron workflow wants to pass some data to next schedule, it can return any data and that data will become available when next run starts. This GetLastCompletionResult() extract the data into expected data structure.

func GetLogger 

func GetLogger(ctx Context) *zap.Logger

GetLogger returns a logger to be used in workflow's context

func GetMetricsScope 

func GetMetricsScope(ctx Context) tally.Scope

GetMetricsScope returns a metrics scope to be used in workflow's context

func GetWorkerStopChannel added in v0.8.2 

func GetWorkerStopChannel(ctx context.Context) <-chan struct{}

GetWorkerStopChannel returns a read-only channel. The closure of this channel indicates the activity worker is stopping. When the worker is stopping, it will close this channel and wait until the worker stop timeout finishes. After the timeout hit, the worker will cancel the activity context and then exit. The timeout can be defined by worker option: WorkerStopTimeout. Use this channel to handle activity graceful exit when the activity worker stops.

func Go 

func Go(ctx Context, f func(ctx Context))

Go creates a new coroutine. It has similar semantic to goroutine in a context of the workflow.

func GoNamed 

func GoNamed(ctx Context, name string, f func(ctx Context))

GoNamed creates a new coroutine with a given human readable name. It has similar semantic to goroutine in a context of the workflow. Name appears in stack traces that are blocked on this Channel.

func HasHeartbeatDetails added in v0.7.5 

func HasHeartbeatDetails(ctx context.Context) bool

HasHeartbeatDetails checks if there is heartbeat details from last attempt.

func HasLastCompletionResult added in v0.8.0 

func HasLastCompletionResult(ctx Context) bool

HasLastCompletionResult checks if there is completion result from previous runs. This is used in combination with cron schedule. A workflow can be started with an optional cron schedule. If a cron workflow wants to pass some data to next schedule, it can return any data and that data will become available when next run starts. This HasLastCompletionResult() checks if there is such data available passing down from previous successful run.

func IsReplayDomain added in v0.8.6 

func IsReplayDomain(dn string) bool

IsReplayDomain checks if the domainName is from replay

func IsReplaying added in v0.5.1 

func IsReplaying(ctx Context) bool

IsReplaying returns whether the current workflow code is replaying.

Warning! Never make decisions, like schedule activity/childWorkflow/timer or send/wait on future/channel, based on this flag as it is going to break workflow determinism requirement. The only reasonable use case for this flag is to avoid some external actions during replay, like custom logging or metric reporting. Please note that Cadence already provide standard logging/metric via workflow.GetLogger(ctx) and workflow.GetMetricsScope(ctx), and those standard mechanism are replay-aware and it will automatically suppress during replay. Only use this flag if you need custom logging/metrics reporting, for example if you want to log to kafka.

Warning! Any action protected by this flag should not fail or if it does fail should ignore that failure or panic on the failure. If workflow don't want to be blocked on those failure, it should ignore those failure; if workflow do want to make sure it proceed only when that action succeed then it should panic on that failure. Panic raised from a workflow causes decision task to fail and cadence server will rescheduled later to retry.

func NewDisconnectedContext added in v0.5.1 

func NewDisconnectedContext(parent Context) (ctx Context, cancel CancelFunc)

NewDisconnectedContext returns a new context that won't propagate parent's cancellation to the new child context. One common use case is to do cleanup work after workflow is cancelled. 

err := workflow.ExecuteActivity(ctx, ActivityFoo).Get(ctx, &activityFooResult)
if err != nil && cadence.IsCanceledError(ctx.Err()) {
  // activity failed, and workflow context is canceled
  disconnectedCtx, _ := workflow.newDisconnectedContext(ctx);
  workflow.ExecuteActivity(disconnectedCtx, handleCancellationActivity).Get(disconnectedCtx, nil)
  return err // workflow return CanceledError
}

func NewFuture 

func NewFuture(ctx Context) (Future, Settable)

NewFuture creates a new future as well as associated Settable that is used to set its value.

func Now 

func Now(ctx Context) time.Time

Now returns the current time when the decision is started or replayed. The workflow needs to use this Now() to get the wall clock time instead of the Go lang library one.

func RecordActivityHeartbeat 

func RecordActivityHeartbeat(ctx context.Context, details ...interface{})

RecordActivityHeartbeat sends heartbeat for the currently executing activity If the activity is either cancelled (or) workflow/activity doesn't exist then we would cancel the context with error context.Canceled. 

TODO: we don't have a way to distinguish between the two cases when context is cancelled because
context doesn't support overriding value of ctx.Error.
TODO: Implement automatic heartbeating with cancellation through ctx.

details - the details that you provided here can be seen in the worflow when it receives TimeoutError, you can check error TimeOutType()/Details().

func RegisterActivity 

func RegisterActivity(activityFunc interface{})

RegisterActivity - register a activity function with the framework. A activity takes a context and input and returns a (result, error) or just error. Examples: 

func sampleActivity(ctx context.Context, input []byte) (result []byte, err error)
func sampleActivity(ctx context.Context, arg1 int, arg2 string) (result *customerStruct, err error)
func sampleActivity(ctx context.Context) (err error)
func sampleActivity() (result string, err error)
func sampleActivity(arg1 bool) (result int, err error)
func sampleActivity(arg1 bool) (err error)

Serialization of all primitive types, structures is supported ... except channels, functions, variadic, unsafe pointer. This method calls panic if activityFunc doesn't comply with the expected format.

func RegisterActivityWithOptions 

func RegisterActivityWithOptions(activityFunc interface{}, opts RegisterActivityOptions)

RegisterActivityWithOptions registers the activity function with options The user can use options to provide an external name for the activity or leave it empty if no external name is required. This can be used as 

client.RegisterActivity(barActivity, RegisterActivityOptions{})
client.RegisterActivity(barActivity, RegisterActivityOptions{Name: "barExternal"})

An activity takes a context and input and returns a (result, error) or just error. Examples: 

func sampleActivity(ctx context.Context, input []byte) (result []byte, err error)
func sampleActivity(ctx context.Context, arg1 int, arg2 string) (result *customerStruct, err error)
func sampleActivity(ctx context.Context) (err error)
func sampleActivity() (result string, err error)
func sampleActivity(arg1 bool) (result int, err error)
func sampleActivity(arg1 bool) (err error)

Serialization of all primitive types, structures is supported ... except channels, functions, variadic, unsafe pointer. This method calls panic if activityFunc doesn't comply with the expected format.

func RegisterWorkflow 

func RegisterWorkflow(workflowFunc interface{})

RegisterWorkflow - registers a workflow function with the framework. A workflow takes a cadence context and input and returns a (result, error) or just error. Examples: 

func sampleWorkflow(ctx workflow.Context, input []byte) (result []byte, err error)
func sampleWorkflow(ctx workflow.Context, arg1 int, arg2 string) (result []byte, err error)
func sampleWorkflow(ctx workflow.Context) (result []byte, err error)
func sampleWorkflow(ctx workflow.Context, arg1 int) (result string, err error)

Serialization of all primitive types, structures is supported ... except channels, functions, variadic, unsafe pointer. This method calls panic if workflowFunc doesn't comply with the expected format.

func RegisterWorkflowWithOptions 

func RegisterWorkflowWithOptions(workflowFunc interface{}, opts RegisterWorkflowOptions)

RegisterWorkflowWithOptions registers the workflow function with options The user can use options to provide an external name for the workflow or leave it empty if no external name is required. This can be used as 

client.RegisterWorkflow(sampleWorkflow, RegisterWorkflowOptions{})
client.RegisterWorkflow(sampleWorkflow, RegisterWorkflowOptions{Name: "foo"})

A workflow takes a cadence context and input and returns a (result, error) or just error. Examples: 

func sampleWorkflow(ctx workflow.Context, input []byte) (result []byte, err error)
func sampleWorkflow(ctx workflow.Context, arg1 int, arg2 string) (result []byte, err error)
func sampleWorkflow(ctx workflow.Context) (result []byte, err error)
func sampleWorkflow(ctx workflow.Context, arg1 int) (result string, err error)

Serialization of all primitive types, structures is supported ... except channels, functions, variadic, unsafe pointer. This method calls panic if workflowFunc doesn't comply with the expected format.

func ReplayPartialWorkflowHistoryFromJSONFile added in v0.9.1 

func ReplayPartialWorkflowHistoryFromJSONFile(logger *zap.Logger, jsonfileName string, lastEventID int64) error

ReplayWorkflowHistoryFromJSONFile executes a single decision task for the given json history file upto provided lastEventID(inclusive). Use for testing the backwards compatibility of code changes and troubleshooting workflows in a debugger. The logger is an optional parameter. Defaults to the noop logger.

func ReplayWorkflowExecution added in v0.7.0 

func ReplayWorkflowExecution(ctx context.Context, service workflowserviceclient.Interface, logger *zap.Logger, domain string, execution WorkflowExecution) error

ReplayWorkflowExecution loads a workflow execution history from the Cadence service and executes a single decision task for it. Use for testing the backwards compatibility of code changes and troubleshooting workflows in a debugger. The logger is the only optional parameter. Defaults to the noop logger.

func ReplayWorkflowHistory added in v0.7.0 

func ReplayWorkflowHistory(logger *zap.Logger, history *shared.History) error

ReplayWorkflowHistory executes a single decision task for the given history. Use for testing the backwards compatibility of code changes and troubleshooting workflows in a debugger. The logger is an optional parameter. Defaults to the noop logger.

func ReplayWorkflowHistoryFromJSONFile added in v0.7.1 

func ReplayWorkflowHistoryFromJSONFile(logger *zap.Logger, jsonfileName string) error

ReplayWorkflowHistoryFromJSONFile executes a single decision task for the given json history file. Use for testing the backwards compatibility of code changes and troubleshooting workflows in a debugger. The logger is an optional parameter. Defaults to the noop logger.

func SetQueryHandler 

func SetQueryHandler(ctx Context, queryType string, handler interface{}) error

SetQueryHandler sets the query handler to handle workflow query. The queryType specify which query type this handler should handle. The handler must be a function that returns 2 values. The first return value must be a serializable result. The second return value must be an error. The handler function could receive any number of input parameters. All the input parameter must be serializable. You should call workflow.SetQueryHandler() at the beginning of the workflow code. When client calls Client.QueryWorkflow() to cadence server, a task will be generated on server that will be dispatched to a workflow worker, which will replay the history events and then execute a query handler based on the query type. The query handler will be invoked out of the context of the workflow, meaning that the handler code must not use cadence context to do things like workflow.NewChannel(), workflow.Go() or to call any workflow blocking functions like Channel.Get() or Future.Get(). Trying to do so in query handler code will fail the query and client will receive QueryFailedError. Example of workflow code that support query type "current_state": 

func MyWorkflow(ctx workflow.Context, input string) error {
  currentState := "started" // this could be any serializable struct
  err := workflow.SetQueryHandler(ctx, "current_state", func() (string, error) {
    return currentState, nil
  })
  if err != nil {
    currentState = "failed to register query handler"
    return err
  }
  // your normal workflow code begins here, and you update the currentState as the code makes progress.
  currentState = "waiting timer"
  err = NewTimer(ctx, time.Hour).Get(ctx, nil)
  if err != nil {
    currentState = "timer failed"
    return err
  }

  currentState = "waiting activity"
  ctx = WithActivityOptions(ctx, myActivityOptions)
  err = ExecuteActivity(ctx, MyActivity, "my_input").Get(ctx, nil)
  if err != nil {
    currentState = "activity failed"
    return err
  }
  currentState = "done"
  return nil
}

func SetStickyWorkflowCacheSize added in v0.7.0 

func SetStickyWorkflowCacheSize(cacheSize int)

SetStickyWorkflowCacheSize sets the cache size for sticky workflow cache. Sticky workflow execution is the affinity between decision tasks of a specific workflow execution to a specific worker. The affinity is set if sticky execution is enabled via Worker.Options (It is enabled by default unless disabled explicitly). The benefit of sticky execution is that workflow does not have to reconstruct the state by replaying from beginning of history events. But the cost is it consumes more memory as it rely on caching workflow execution's running state on the worker. The cache is shared between workers running within same process. This must be called before any worker is started. If not called, the default size of 10K (might change in future) will be used.

func Sleep 

func Sleep(ctx Context, d time.Duration) (err error)

Sleep pauses the current workflow for at least the duration d. A negative or zero duration causes Sleep to return immediately. Workflow code needs to use this Sleep() to sleep instead of the Go lang library one(timer.Sleep()). You can cancel the pending sleep by cancel the Context (using context from workflow.WithCancel(ctx)). Sleep() returns nil if the duration d is passed, or it returns *CanceledError if the ctx is canceled. There are 2 reasons the ctx could be canceled: 1) your workflow code cancel the ctx (with workflow.WithCancel(ctx)); 2) your workflow itself is canceled by external request. The current timer resolution implementation is in seconds and uses math.Ceil(d.Seconds()) as the duration. But is subjected to change in the future.

func UpsertSearchAttributes added in v0.9.0 

func UpsertSearchAttributes(ctx Context, attributes map[string]interface{}) error

UpsertSearchAttributes is used to add or update workflow search attributes. The search attributes can be used in query of List/Scan/Count workflow APIs. The key and value type must be registered on cadence server side; The value has to deterministic when replay; The value has to be Json serializable. UpsertSearchAttributes will merge attributes to existing map in workflow, for example workflow code: 

  func MyWorkflow(ctx workflow.Context, input string) error {
	   attr1 := map[string]interface{}{
		   "CustomIntField": 1,
		   "CustomBoolField": true,
	   }
	   worklfow.UpsertSearchAttributes(ctx, attr1)

	   attr2 := map[string]interface{}{
		   "CustomIntField": 2,
		   "CustomKeywordField": "seattle",
	   }
	   worklfow.UpsertSearchAttributes(ctx, attr2)
  }

will eventually have search attributes: 

map[string]interface{}{
	"CustomIntField": 2,
	"CustomBoolField": true,
	"CustomKeywordField": "seattle",
}

This is only supported when using ElasticSearch.

func WithActivityTask 

func WithActivityTask(
	ctx context.Context,
	task *shared.PollForActivityTaskResponse,
	taskList string,
	invoker ServiceInvoker,
	logger *zap.Logger,
	scope tally.Scope,
	dataConverter DataConverter,
	workerStopChannel <-chan struct{},
	contextPropagators []ContextPropagator,
	tracer opentracing.Tracer,
) context.Context

WithActivityTask adds activity specific information into context. Use this method to unit test activity implementations that use context extractor methodshared.

func WithCancel 

func WithCancel(parent Context) (ctx Context, cancel CancelFunc)

WithCancel returns a copy of parent with a new Done channel. The returned context's Done channel is closed when the returned cancel function is called or when the parent context's Done channel is closed, whichever happens first.

Canceling this context releases resources associated with it, so code should call cancel as soon as the operations running in this Context complete.

Types

type ActivityInfo 

type ActivityInfo struct {
	TaskToken          []byte
	WorkflowType       *WorkflowType
	WorkflowDomain     string
	WorkflowExecution  WorkflowExecution
	ActivityID         string
	ActivityType       ActivityType
	TaskList           string
	HeartbeatTimeout   time.Duration // Maximum time between heartbeats. 0 means no heartbeat needed.
	ScheduledTimestamp time.Time     // Time of activity scheduled by a workflow
	StartedTimestamp   time.Time     // Time of activity start
	Deadline           time.Time     // Time of activity timeout
	Attempt            int32         // Attempt starts from 0, and increased by 1 for every retry if retry policy is specified.
}

ActivityInfo contains information about currently executing activity.

func GetActivityInfo 

func GetActivityInfo(ctx context.Context) ActivityInfo

GetActivityInfo returns information about currently executing activity.

type ActivityOptions 

type ActivityOptions struct {
	// TaskList that the activity needs to be scheduled on.
	// optional: The default task list with the same name as the workflow task list.
	TaskList string

	// ScheduleToCloseTimeout - The end to end timeout for the activity needed.
	// The zero value of this uses default value.
	// Optional: The default value is the sum of ScheduleToStartTimeout and StartToCloseTimeout
	ScheduleToCloseTimeout time.Duration

	// ScheduleToStartTimeout - The queue timeout before the activity starts executed.
	// Mandatory: No default.
	ScheduleToStartTimeout time.Duration

	// StartToCloseTimeout - The timeout from the start of execution to end of it.
	// Mandatory: No default.
	StartToCloseTimeout time.Duration

	// HeartbeatTimeout - The periodic timeout while the activity is in execution. This is
	// the max interval the server needs to hear at-least one ping from the activity.
	// Optional: Default zero, means no heart beating is needed.
	HeartbeatTimeout time.Duration

	// WaitForCancellation - Whether to wait for cancelled activity to be completed(
	// activity can be failed, completed, cancel accepted)
	// Optional: default false
	WaitForCancellation bool

	// ActivityID - Business level activity ID, this is not needed for most of the cases if you have
	// to specify this then talk to cadence team. This is something will be done in future.
	// Optional: default empty string
	ActivityID string

	// RetryPolicy specify how to retry activity if error happens. When RetryPolicy.ExpirationInterval is specified
	// and it is larger than the activity's ScheduleToStartTimeout, then the ExpirationInterval will override activity's
	// ScheduleToStartTimeout. This is to avoid retrying on ScheduleToStartTimeout error which only happen when worker
	// is not picking up the task within the timeout. Retrying ScheduleToStartTimeout does not make sense as it just
	// mark the task as failed and create a new task and put back in the queue waiting worker to pick again. Cadence
	// server also make sure the ScheduleToStartTimeout will not be larger than the workflow's timeout.
	// Same apply to ScheduleToCloseTimeout. See more details about RetryPolicy on the doc for RetryPolicy.
	// Optional: default is no retry
	RetryPolicy *RetryPolicy
}

ActivityOptions stores all activity-specific parameters that will be stored inside of a context. The current timeout resolution implementation is in seconds and uses math.Ceil(d.Seconds()) as the duration. But is subjected to change in the future.

type ActivityTaskHandler 

type ActivityTaskHandler interface {
	// Executes the activity task
	// The response is one of the types:
	// - RespondActivityTaskCompletedRequest
	// - RespondActivityTaskFailedRequest
	// - RespondActivityTaskCanceledRequest
	Execute(taskList string, task *s.PollForActivityTaskResponse) (interface{}, error)
}

ActivityTaskHandler represents activity task handlers.

type ActivityType 

type ActivityType struct {
	Name string
}

ActivityType identifies a activity type.

type CancelFunc 

type CancelFunc func()

A CancelFunc tells an operation to abandon its work. A CancelFunc does not wait for the work to stop. After the first call, subsequent calls to a CancelFunc do nothing.

type CanceledError 

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

CanceledError returned when operation was canceled.

func NewCanceledError 

func NewCanceledError(details ...interface{}) *CanceledError

NewCanceledError creates CanceledError instance

func (*CanceledError) Details 

func (e *CanceledError) Details(d ...interface{}) error

Details extracts strong typed detail data of this error.

func (*CanceledError) Error 

func (e *CanceledError) Error() string

Error from error interface

func (*CanceledError) HasDetails added in v0.5.1 

func (e *CanceledError) HasDetails() bool

HasDetails return if this error has strong typed detail data.

type Channel 

type Channel interface {
	// Receive blocks until it receives a value, and then assigns the received value to the provided pointer.
	// Returns false when Channel is closed.
	// Parameter valuePtr is a pointer to the expected data structure to be received. For example:
	//  var v string
	//  c.Receive(ctx, &v)
	Receive(ctx Context, valuePtr interface{}) (more bool)

	// ReceiveAsync try to receive from Channel without blocking. If there is data available from the Channel, it
	// assign the data to valuePtr and returns true. Otherwise, it returns false immediately.
	ReceiveAsync(valuePtr interface{}) (ok bool)

	// ReceiveAsyncWithMoreFlag is same as ReceiveAsync with extra return value more to indicate if there could be
	// more value from the Channel. The more is false when Channel is closed.
	ReceiveAsyncWithMoreFlag(valuePtr interface{}) (ok bool, more bool)

	// Send blocks until the data is sent.
	Send(ctx Context, v interface{})

	// SendAsync try to send without blocking. It returns true if the data was sent, otherwise it returns false.
	SendAsync(v interface{}) (ok bool)

	// Close close the Channel, and prohibit subsequent sends.
	Close()
}

Channel must be used instead of native go channel by workflow code. Use workflow.NewChannel(ctx) method to create Channel instance.

func GetSignalChannel 

func GetSignalChannel(ctx Context, signalName string) Channel

GetSignalChannel returns channel corresponding to the signal name.

func NewBufferedChannel 

func NewBufferedChannel(ctx Context, size int) Channel

NewBufferedChannel create new buffered Channel instance

func NewChannel 

func NewChannel(ctx Context) Channel

NewChannel create new Channel instance

func NewNamedBufferedChannel 

func NewNamedBufferedChannel(ctx Context, name string, size int) Channel

NewNamedBufferedChannel create new BufferedChannel instance with a given human readable name. Name appears in stack traces that are blocked on this Channel.

func NewNamedChannel 

func NewNamedChannel(ctx Context, name string) Channel

NewNamedChannel create new Channel instance with a given human readable name. Name appears in stack traces that are blocked on this channel.

type ChildWorkflowFuture 

type ChildWorkflowFuture interface {
	Future
	// GetChildWorkflowExecution returns a future that will be ready when child workflow execution started. You can
	// get the WorkflowExecution of the child workflow from the future. Then you can use Workflow ID and RunID of
	// child workflow to cancel or send signal to child workflow.
	//  childWorkflowFuture := workflow.ExecuteChildWorkflow(ctx, child, ...)
	//  var childWE WorkflowExecution
	//  if err := childWorkflowFuture.GetChildWorkflowExecution().Get(&childWE); err == nil {
	//      // child workflow started, you can use childWE to get the WorkflowID and RunID of child workflow
	//  }
	GetChildWorkflowExecution() Future

	// SignalWorkflowByID sends a signal to the child workflow. This call will block until child workflow is started.
	SignalChildWorkflow(ctx Context, signalName string, data interface{}) Future
}

ChildWorkflowFuture represents the result of a child workflow execution

func ExecuteChildWorkflow 

func ExecuteChildWorkflow(ctx Context, childWorkflow interface{}, args ...interface{}) ChildWorkflowFuture

ExecuteChildWorkflow requests child workflow execution in the context of a workflow. Context can be used to pass the settings for the child workflow. For example: task list that this child workflow should be routed, timeouts that need to be configured. Use ChildWorkflowOptions to pass down the options. 

 cwo := ChildWorkflowOptions{
	    ExecutionStartToCloseTimeout: 10 * time.Minute,
	    TaskStartToCloseTimeout: time.Minute,
	}
 ctx := WithChildWorkflowOptions(ctx, cwo)

Input childWorkflow is either a workflow name or a workflow function that is getting scheduled. Input args are the arguments that need to be passed to the child workflow function represented by childWorkflow. If the child workflow failed to complete then the future get error would indicate the failure and it can be one of CustomError, TimeoutError, CanceledError, GenericError. You can cancel the pending child workflow using context(workflow.WithCancel(ctx)) and that will fail the workflow with error CanceledError. ExecuteChildWorkflow returns ChildWorkflowFuture.

type ChildWorkflowOptions 

type ChildWorkflowOptions struct {
	// Domain of the child workflow.
	// Optional: the current workflow (parent)'s domain will be used if this is not provided.
	Domain string

	// WorkflowID of the child workflow to be scheduled.
	// Optional: an auto generated workflowID will be used if this is not provided.
	WorkflowID string

	// TaskList that the child workflow needs to be scheduled on.
	// Optional: the parent workflow task list will be used if this is not provided.
	TaskList string

	// ExecutionStartToCloseTimeout - The end to end timeout for the child workflow execution.
	// Mandatory: no default
	ExecutionStartToCloseTimeout time.Duration

	// TaskStartToCloseTimeout - The decision task timeout for the child workflow.
	// Optional: default is 10s if this is not provided (or if 0 is provided).
	TaskStartToCloseTimeout time.Duration

	// ChildPolicy defines the behavior of child workflow when parent workflow is terminated.
	// Optional: default to use ChildWorkflowPolicyAbandon. We currently only support this policy.
	ChildPolicy ChildWorkflowPolicy

	// WaitForCancellation - Whether to wait for cancelled child workflow to be ended (child workflow can be ended
	// as: completed/failed/timedout/terminated/canceled)
	// Optional: default false
	WaitForCancellation bool

	// WorkflowIDReusePolicy - Whether server allow reuse of workflow ID, can be useful
	// for dedup logic if set to WorkflowIdReusePolicyRejectDuplicate
	WorkflowIDReusePolicy WorkflowIDReusePolicy

	// RetryPolicy specify how to retry child workflow if error happens.
	// Optional: default is no retry
	RetryPolicy *RetryPolicy

	// CronSchedule - Optional cron schedule for workflow. If a cron schedule is specified, the workflow will run
	// as a cron based on the schedule. The scheduling will be based on UTC time. Schedule for next run only happen
	// after the current run is completed/failed/timeout. If a RetryPolicy is also supplied, and the workflow failed
	// or timeout, the workflow will be retried based on the retry policy. While the workflow is retrying, it won't
	// schedule its next run. If next schedule is due while workflow is running (or retrying), then it will skip that
	// schedule. Cron workflow will not stop until it is terminated or cancelled (by returning cadence.CanceledError).
	// The cron spec is as following:
	// ┌───────────── minute (0 - 59)
	// │ ┌───────────── hour (0 - 23)
	// │ │ ┌───────────── day of the month (1 - 31)
	// │ │ │ ┌───────────── month (1 - 12)
	// │ │ │ │ ┌───────────── day of the week (0 - 6) (Sunday to Saturday)
	// │ │ │ │ │
	// │ │ │ │ │
	// * * * * *
	CronSchedule string

	// Memo - Optional non-indexed info that will be shown in list workflow.
	Memo map[string]interface{}

	// SearchAttributes - Optional indexed info that can be used in query of List/Scan/Count workflow APIs (only
	// supported when Cadence server is using ElasticSearch). The key and value type must be registered on Cadence server side.
	// Use GetSearchAttributes API to get valid key and corresponding value type.
	SearchAttributes map[string]interface{}
}

ChildWorkflowOptions stores all child workflow specific parameters that will be stored inside of a Context. The current timeout resolution implementation is in seconds and uses math.Ceil(d.Seconds()) as the duration. But is subjected to change in the future.

type ChildWorkflowPolicy 

type ChildWorkflowPolicy int32

ChildWorkflowPolicy defines child workflow behavior when parent workflow is terminated. 

const (
	// ChildWorkflowPolicyTerminate is policy that will terminate all child workflows when parent workflow is terminated.
	// TODO: this is not supported yet
	ChildWorkflowPolicyTerminate ChildWorkflowPolicy = 0
	// ChildWorkflowPolicyRequestCancel is policy that will send cancel request to all open child workflows when parent
	// workflow is terminated.
	// TODO: this is not supported yet
	ChildWorkflowPolicyRequestCancel ChildWorkflowPolicy = 1
	// ChildWorkflowPolicyAbandon is policy that will have no impact to child workflow execution when parent workflow is
	// terminated.
	ChildWorkflowPolicyAbandon ChildWorkflowPolicy = 2
)

type Client 

type Client interface {
	// StartWorkflow starts a workflow execution
	// The user can use this to start using a function or workflow type name.
	// Either by
	//     StartWorkflow(ctx, options, "workflowTypeName", arg1, arg2, arg3)
	//     or
	//     StartWorkflow(ctx, options, workflowExecuteFn, arg1, arg2, arg3)
	// The errors it can return:
	//	- EntityNotExistsError, if domain does not exists
	//	- BadRequestError
	//	- WorkflowExecutionAlreadyStartedError
	//	- InternalServiceError
	// The current timeout resolution implementation is in seconds and uses math.Ceil(d.Seconds()) as the duration. But is
	// subjected to change in the future.
	StartWorkflow(ctx context.Context, options StartWorkflowOptions, workflow interface{}, args ...interface{}) (*WorkflowExecution, error)

	// ExecuteWorkflow starts a workflow execution and return a WorkflowRun instance and error
	// The user can use this to start using a function or workflow type name.
	// Either by
	//     ExecuteWorkflow(ctx, options, "workflowTypeName", arg1, arg2, arg3)
	//     or
	//     ExecuteWorkflow(ctx, options, workflowExecuteFn, arg1, arg2, arg3)
	// The errors it can return:
	//	- EntityNotExistsError, if domain does not exists
	//	- BadRequestError
	//	- InternalServiceError
	//
	// The current timeout resolution implementation is in seconds and uses math.Ceil(d.Seconds()) as the duration. But is
	// subjected to change in the future.
	//
	// WorkflowRun has three methods:
	//  - GetID() string: which return workflow ID (which is same as StartWorkflowOptions.ID if provided)
	//  - GetRunID() string: which return the first started workflow run ID (please see below)
	//  - Get(ctx context.Context, valuePtr interface{}) error: which will fill the workflow
	//    execution result to valuePtr, if workflow execution is a success, or return corresponding
	//    error. This is a blocking API.
	// NOTE: if the started workflow return ContinueAsNewError during the workflow execution, the
	// return result of GetRunID() will be the started workflow run ID, not the new run ID caused by ContinueAsNewError,
	// however, Get(ctx context.Context, valuePtr interface{}) will return result from the run which did not return ContinueAsNewError.
	// Say ExecuteWorkflow started a workflow, in its first run, has run ID "run ID 1", and returned ContinueAsNewError,
	// the second run has run ID "run ID 2" and return some result other than ContinueAsNewError:
	// GetRunID() will always return "run ID 1" and  Get(ctx context.Context, valuePtr interface{}) will return the result of second run.
	// NOTE: DO NOT USE THIS API INSIDE A WORKFLOW, USE workflow.ExecuteChildWorkflow instead
	ExecuteWorkflow(ctx context.Context, options StartWorkflowOptions, workflow interface{}, args ...interface{}) (WorkflowRun, error)

	// GetWorkfow retrieves a workflow execution and return a WorkflowRun instance
	// - workflow ID of the workflow.
	// - runID can be default(empty string). if empty string then it will pick the last running execution of that workflow ID.
	//
	// WorkflowRun has three methods:
	//  - GetID() string: which return workflow ID (which is same as StartWorkflowOptions.ID if provided)
	//  - GetRunID() string: which return the first started workflow run ID (please see below)
	//  - Get(ctx context.Context, valuePtr interface{}) error: which will fill the workflow
	//    execution result to valuePtr, if workflow execution is a success, or return corresponding
	//    error. This is a blocking API.
	// NOTE: if the retrieved workflow returned ContinueAsNewError during the workflow execution, the
	// return result of GetRunID() will be the retrieved workflow run ID, not the new run ID caused by ContinueAsNewError,
	// however, Get(ctx context.Context, valuePtr interface{}) will return result from the run which did not return ContinueAsNewError.
	GetWorkflow(ctx context.Context, workflowID string, runID string) WorkflowRun

	// SignalWorkflow sends a signals to a workflow in execution
	// - workflow ID of the workflow.
	// - runID can be default(empty string). if empty string then it will pick the running execution of that workflow ID.
	// - signalName name to identify the signal.
	// The errors it can return:
	//	- EntityNotExistsError
	//	- InternalServiceError
	SignalWorkflow(ctx context.Context, workflowID string, runID string, signalName string, arg interface{}) error

	// SignalWithStartWorkflow sends a signal to a running workflow.
	// If the workflow is not running or not found, it starts the workflow and then sends the signal in transaction.
	// - workflowID, signalName, signalArg are same as SignalWorkflow's parameters
	// - options, workflow, workflowArgs are same as StartWorkflow's parameters
	// Note: options.WorkflowIDReusePolicy is default to WorkflowIDReusePolicyAllowDuplicate in this API;
	// while in StartWorkflow/ExecuteWorkflow APIs it is default to WorkflowIdReusePolicyAllowDuplicateFailedOnly.
	// The errors it can return:
	//  - EntityNotExistsError, if domain does not exist
	//  - BadRequestError
	//	- InternalServiceError
	SignalWithStartWorkflow(ctx context.Context, workflowID string, signalName string, signalArg interface{},
		options StartWorkflowOptions, workflow interface{}, workflowArgs ...interface{}) (*WorkflowExecution, error)

	// CancelWorkflow cancels a workflow in execution
	// - workflow ID of the workflow.
	// - runID can be default(empty string). if empty string then it will pick the running execution of that workflow ID.
	// The errors it can return:
	//	- EntityNotExistsError
	//	- BadRequestError
	//	- InternalServiceError
	CancelWorkflow(ctx context.Context, workflowID string, runID string) error

	// TerminateWorkflow terminates a workflow execution.
	// workflowID is required, other parameters are optional.
	// - workflow ID of the workflow.
	// - runID can be default(empty string). if empty string then it will pick the running execution of that workflow ID.
	// The errors it can return:
	//	- EntityNotExistsError
	//	- BadRequestError
	//	- InternalServiceError
	TerminateWorkflow(ctx context.Context, workflowID string, runID string, reason string, details []byte) error

	// GetWorkflowHistory gets history events of a particular workflow
	// - workflow ID of the workflow.
	// - runID can be default(empty string). if empty string then it will pick the last running execution of that workflow ID.
	// - whether use long poll for tracking new events: when the workflow is running, there can be new events generated during iteration
	// 	 of HistoryEventIterator, if isLongPoll == true, then iterator will do long poll, tracking new history event, i.e. the iteration
	//   will not be finished until workflow is finished; if isLongPoll == false, then iterator will only return current history events.
	// - whether return all history events or just the last event, which contains the workflow execution end result
	// Example:-
	//	To iterate all events,
	//		iter := GetWorkflowHistory(ctx, workflowID, runID, isLongPoll, filterType)
	//		events := []*shared.HistoryEvent{}
	//		for iter.HasNext() {
	//			event, err := iter.Next()
	//			if err != nil {
	//				return err
	//			}
	//			events = append(events, event)
	//		}
	GetWorkflowHistory(ctx context.Context, workflowID string, runID string, isLongPoll bool, filterType s.HistoryEventFilterType) HistoryEventIterator

	// CompleteActivity reports activity completed.
	// activity Execute method can return acitivity.activity.ErrResultPending to
	// indicate the activity is not completed when it's Execute method returns. In that case, this CompleteActivity() method
	// should be called when that activity is completed with the actual result and error. If err is nil, activity task
	// completed event will be reported; if err is CanceledError, activity task cancelled event will be reported; otherwise,
	// activity task failed event will be reported.
	// An activity implementation should use GetActivityInfo(ctx).TaskToken function to get task token to use for completion.
	// Example:-
	//	To complete with a result.
	//  	CompleteActivity(token, "Done", nil)
	//	To fail the activity with an error.
	//      CompleteActivity(token, nil, cadence.NewCustomError("reason", details)
	// The activity can fail with below errors ErrorWithDetails, TimeoutError, CanceledError.
	CompleteActivity(ctx context.Context, taskToken []byte, result interface{}, err error) error

	// CompleteActivityById reports activity completed.
	// Similar to CompleteActivity, but may save cadence user from keeping taskToken info.
	// activity Execute method can return activity.ErrResultPending to
	// indicate the activity is not completed when it's Execute method returns. In that case, this CompleteActivityById() method
	// should be called when that activity is completed with the actual result and error. If err is nil, activity task
	// completed event will be reported; if err is CanceledError, activity task cancelled event will be reported; otherwise,
	// activity task failed event will be reported.
	// An activity implementation should use activityID provided in ActivityOption to use for completion.
	// domain name, workflowID, activityID are required, runID is optional.
	// The errors it can return:
	//  - ErrorWithDetails
	//  - TimeoutError
	//  - CanceledError
	CompleteActivityByID(ctx context.Context, domain, workflowID, runID, activityID string, result interface{}, err error) error

	// RecordActivityHeartbeat records heartbeat for an activity.
	// details - is the progress you want to record along with heart beat for this activity.
	// The errors it can return:
	//	- EntityNotExistsError
	//	- InternalServiceError
	RecordActivityHeartbeat(ctx context.Context, taskToken []byte, details ...interface{}) error

	// RecordActivityHeartbeatByID records heartbeat for an activity.
	// details - is the progress you want to record along with heart beat for this activity.
	// The errors it can return:
	//	- EntityNotExistsError
	//	- InternalServiceError
	RecordActivityHeartbeatByID(ctx context.Context, domain, workflowID, runID, activityID string, details ...interface{}) error

	// ListClosedWorkflow gets closed workflow executions based on request filters
	// The errors it can return:
	//  - BadRequestError
	//  - InternalServiceError
	//  - EntityNotExistError
	ListClosedWorkflow(ctx context.Context, request *s.ListClosedWorkflowExecutionsRequest) (*s.ListClosedWorkflowExecutionsResponse, error)

	// ListClosedWorkflow gets open workflow executions based on request filters
	// The errors it can return:
	//  - BadRequestError
	//  - InternalServiceError
	//  - EntityNotExistError
	ListOpenWorkflow(ctx context.Context, request *s.ListOpenWorkflowExecutionsRequest) (*s.ListOpenWorkflowExecutionsResponse, error)

	// ListWorkflow gets workflow executions based on query. This API only works with ElasticSearch,
	// and will return BadRequestError when using Cassandra or MySQL. The query is basically the SQL WHERE clause,
	// examples:
	//  - "(WorkflowID = 'wid1' or (WorkflowType = 'type2' and WorkflowID = 'wid2'))".
	//  - "CloseTime between '2019-08-27T15:04:05+00:00' and '2019-08-28T15:04:05+00:00'".
	//  - to list only open workflow use "CloseTime = missing"
	// Retrieved workflow executions are sorted by StartTime in descending order when list open workflow,
	// and sorted by CloseTime in descending order for other queries.
	// The errors it can return:
	//  - BadRequestError
	//  - InternalServiceError
	ListWorkflow(ctx context.Context, request *s.ListWorkflowExecutionsRequest) (*s.ListWorkflowExecutionsResponse, error)

	// ScanWorkflow gets workflow executions based on query. This API only works with ElasticSearch,
	// and will return BadRequestError when using Cassandra or MySQL. The query is basically the SQL WHERE clause
	// (see ListWorkflow for query examples).
	// ScanWorkflow should be used when retrieving large amount of workflows and order is not needed.
	// It will use more ElasticSearch resources than ListWorkflow, but will be several times faster
	// when retrieving millions of workflows.
	// The errors it can return:
	//  - BadRequestError
	//  - InternalServiceError
	ScanWorkflow(ctx context.Context, request *s.ListWorkflowExecutionsRequest) (*s.ListWorkflowExecutionsResponse, error)

	// CountWorkflow gets number of workflow executions based on query. This API only works with ElasticSearch,
	// and will return BadRequestError when using Cassandra or MySQL. The query is basically the SQL WHERE clause
	// (see ListWorkflow for query examples).
	// The errors it can return:
	//  - BadRequestError
	//  - InternalServiceError
	CountWorkflow(ctx context.Context, request *s.CountWorkflowExecutionsRequest) (*s.CountWorkflowExecutionsResponse, error)

	// GetSearchAttributes returns valid search attributes keys and value types.
	// The search attributes can be used in query of List/Scan/Count APIs. Adding new search attributes requires cadence server
	// to update dynamic config ValidSearchAttributes.
	GetSearchAttributes(ctx context.Context) (*s.GetSearchAttributesResponse, error)

	// QueryWorkflow queries a given workflow execution and returns the query result synchronously. Parameter workflowID
	// and queryType are required, other parameters are optional. The workflowID and runID (optional) identify the
	// target workflow execution that this query will be send to. If runID is not specified (empty string), server will
	// use the currently running execution of that workflowID. The queryType specifies the type of query you want to
	// run. By default, cadence supports "__stack_trace" as a standard query type, which will return string value
	// representing the call stack of the target workflow. The target workflow could also setup different query handler
	// to handle custom query types.
	// See comments at workflow.SetQueryHandler(ctx Context, queryType string, handler interface{}) for more details
	// on how to setup query handler within the target workflow.
	// - workflowID is required.
	// - runID can be default(empty string). if empty string then it will pick the running execution of that workflow ID.
	// - queryType is the type of the query.
	// - args... are the optional query parameters.
	// The errors it can return:
	//  - BadRequestError
	//  - InternalServiceError
	//  - EntityNotExistError
	//  - QueryFailError
	QueryWorkflow(ctx context.Context, workflowID string, runID string, queryType string, args ...interface{}) (Value, error)

	// DescribeWorkflowExecution returns information about the specified workflow execution.
	// The errors it can return:
	//  - BadRequestError
	//  - InternalServiceError
	//  - EntityNotExistError
	DescribeWorkflowExecution(ctx context.Context, workflowID, runID string) (*s.DescribeWorkflowExecutionResponse, error)

	// DescribeTaskList returns information about the target tasklist, right now this API returns the
	// pollers which polled this tasklist in last few minutes.
	// The errors it can return:
	//  - BadRequestError
	//  - InternalServiceError
	//  - EntityNotExistError
	DescribeTaskList(ctx context.Context, tasklist string, tasklistType s.TaskListType) (*s.DescribeTaskListResponse, error)
}

Client is the client for starting and getting information about a workflow executions as well as completing activities asynchronously.

func NewClient 

func NewClient(service workflowserviceclient.Interface, domain string, options *ClientOptions) Client

NewClient creates an instance of a workflow client

type ClientOptions 

type ClientOptions struct {
	MetricsScope       tally.Scope
	Identity           string
	DataConverter      DataConverter
	Tracer             opentracing.Tracer
	ContextPropagators []ContextPropagator
}

ClientOptions are optional parameters for Client creation.

type Context 

type Context interface {
	// Deadline returns the time when work done on behalf of this context
	// should be canceled.  Deadline returns ok==false when no deadline is
	// set.  Successive calls to Deadline return the same results.
	Deadline() (deadline time.Time, ok bool)

	// Done returns a channel that's closed when work done on behalf of this
	// context should be canceled.  Done may return nil if this context can
	// never be canceled.  Successive calls to Done return the same value.
	//
	// WithCancel arranges for Done to be closed when cancel is called;
	// WithDeadline arranges for Done to be closed when the deadline
	// expires; WithTimeout arranges for Done to be closed when the timeout
	// elapses.
	//
	// Done is provided for use in select statements:
	//
	//  // Stream generates values with DoSomething and sends them to out
	//  // until DoSomething returns an error or ctx.Done is closed.
	//  func Stream(ctx Context, out Channel) (err error) {
	//	for {
	//		v, err := DoSomething(ctx)
	//		if err != nil {
	//			return err
	//		}
	//		s := NewSelector(ctx)
	//		s.AddReceive(ctx.Done(),  func(v interface{}) { err = ctx.Err() })
	//		s.AddReceive(v, func(v interface{}, more bool) { out.Send(ctx, v) })
	//		s.Select(ctx)
	//		if err != nil {
	//			return err
	//		}
	//	}
	//  }
	//
	// See http://blog.golang.org/pipelines for more examples of how to use
	// a Done channel for cancellation.
	Done() Channel

	// Err returns a non-nil error value after Done is closed.  Err returns
	// Canceled if the context was canceled or DeadlineExceeded if the
	// context's deadline passed.  No other values for Err are defined.
	// After Done is closed, successive calls to Err return the same value.
	Err() error

	// Value returns the value associated with this context for key, or nil
	// if no value is associated with key.  Successive calls to Value with
	// the same key returns the same result.
	//
	// Use context values only for request-scoped data that transits
	// processes and API boundaries, not for passing optional parameters to
	// functions.
	//
	// A key identifies a specific value in a Context.  Functions that wish
	// to store values in Context typically allocate a key in a global
	// variable then use that key as the argument to context.WithValue and
	// Context.Value.  A key can be any type that supports equality;
	// packages should define keys as an unexported type to avoid
	// collisions.
	//
	// Packages that define a Context key should provide type-safe accessors
	// for the values stores using that key:
	//
	// 	// Package user defines a User type that's stored in Contexts.
	// 	package user
	//
	// 	import "golang.org/x/net/context"
	//
	// 	// User is the type of value stored in the Contexts.
	// 	type User struct {...}
	//
	// 	// key is an unexported type for keys defined in this package.
	// 	// This prevents collisions with keys defined in other packages.
	// 	type key int
	//
	// 	// userKey is the key for user.User values in Contexts.  It is
	// 	// unexported; clients use user.NewContext and user.FromContext
	// 	// instead of using this key directly.
	// 	var userKey key = 0
	//
	// 	// NewContext returns a new Context that carries value u.
	// 	func NewContext(ctx context.Context, u *User) context.Context {
	// 		return context.WithValue(ctx, userKey, u)
	// 	}
	//
	// 	// FromContext returns the User value stored in ctx, if any.
	// 	func FromContext(ctx context.Context) (*User, bool) {
	// 		u, ok := ctx.Value(userKey).(*User)
	// 		return u, ok
	// 	}
	Value(key interface{}) interface{}
}

Context is a clone of context.Context with Done() returning Channel instead of native channel. A Context carries a deadline, a cancellation signal, and other values across API boundaries.

Context's methods may be called by multiple goroutines simultaneously.

func Background added in v0.8.4 

func Background() Context

Background returns a non-nil, empty Context. It is never canceled, has no values, and has no deadline

func CreateSession added in v0.8.4 

func CreateSession(ctx Context, sessionOptions *SessionOptions) (Context, error)

CreateSession creates a session and returns a new context which contains information of the created session. The session will be created on the tasklist user specified in ActivityOptions. If none is specified, the default one will be used.

CreationSession will fail in the following situations:

  1. The context passed in already contains a session which is still open (not closed and failed).
  2. All the workers are busy (number of sessions currently running on all the workers have reached MaxConcurrentSessionExecutionSize, which is specified when starting the workers) and session cannot be created within a specified timeout.

If an activity is executed using the returned context, it's regarded as part of the session. All activities within the same session will be executed by the same worker. User still needs to handle the error returned when executing an activity. Session will not be marked as failed if an activity within it returns an error. Only when the worker executing the session is down, that session will be marked as failed. Executing an activity within a failed session will return ErrSessionFailed immediately without scheduling that activity.

The returned session Context will be cancelled if the session fails (worker died) or CompleteSession() is called. This means that in these two cases, all user activities scheduled using the returned session Context will also be cancelled.

If user wants to end a session since activity returns some error, use CompleteSession API below. New session can be created if necessary to retry the whole session.

Example: 

   so := &SessionOptions{
	      ExecutionTimeout: time.Minute,
	      CreationTimeout:  time.Minute,
   }
   sessionCtx, err := CreateSession(ctx, so)
   if err != nil {
		    // Creation failed. Wrong ctx or too many outstanding sessions.
   }
   defer CompleteSession(sessionCtx)
   err = ExecuteActivity(sessionCtx, someActivityFunc, activityInput).Get(sessionCtx, nil)
   if err == ErrSessionFailed {
       // Session has failed
   } else {
       // Handle activity error
   }
   ... // execute more activities using sessionCtx

func RecreateSession added in v0.8.4 

func RecreateSession(ctx Context, recreateToken []byte, sessionOptions *SessionOptions) (Context, error)

RecreateSession recreate a session based on the sessionInfo passed in. Activities executed within the recreated session will be executed by the same worker as the previous session. RecreateSession() returns an error under the same situation as CreateSession() or the token passed in is invalid. It also has the same usage as CreateSession().

The main usage of RecreateSession is for long sessions that are splited into multiple runs. At the end of one run, complete the current session, get recreateToken from sessionInfo by calling SessionInfo.GetRecreateToken() and pass the token to the next run. In the new run, session can be recreated using that token.

func WithActivityOptions 

func WithActivityOptions(ctx Context, options ActivityOptions) Context

WithActivityOptions adds all options to the copy of the context. The current timeout resolution implementation is in seconds and uses math.Ceil(d.Seconds()) as the duration. But is subjected to change in the future.

func WithChildPolicy 

func WithChildPolicy(ctx Context, childPolicy ChildWorkflowPolicy) Context

WithChildPolicy adds a ChildWorkflowPolicy to the context.

func WithChildWorkflowOptions 

func WithChildWorkflowOptions(ctx Context, cwo ChildWorkflowOptions) Context

WithChildWorkflowOptions adds all workflow options to the context. The current timeout resolution implementation is in seconds and uses math.Ceil(d.Seconds()) as the duration. But is subjected to change in the future.

func WithDataConverter added in v0.7.0 

func WithDataConverter(ctx Context, dc DataConverter) Context

WithDataConverter adds DataConverter to the context.

func WithExecutionStartToCloseTimeout 

func WithExecutionStartToCloseTimeout(ctx Context, d time.Duration) Context

WithExecutionStartToCloseTimeout adds a workflow execution timeout to the context. The current timeout resolution implementation is in seconds and uses math.Ceil(d.Seconds()) as the duration. But is subjected to change in the future.

func WithHeartbeatTimeout 

func WithHeartbeatTimeout(ctx Context, d time.Duration) Context

WithHeartbeatTimeout adds a timeout to the copy of the context. The current timeout resolution implementation is in seconds and uses math.Ceil(d.Seconds()) as the duration. But is subjected to change in the future.

func WithLocalActivityOptions added in v0.5.1 

func WithLocalActivityOptions(ctx Context, options LocalActivityOptions) Context

WithLocalActivityOptions adds local activity options to the copy of the context. The current timeout resolution implementation is in seconds and uses math.Ceil(d.Seconds()) as the duration. But is subjected to change in the future.

func WithRetryPolicy added in v0.7.5 

func WithRetryPolicy(ctx Context, retryPolicy RetryPolicy) Context

WithRetryPolicy adds retry policy to the copy of the context

func WithScheduleToCloseTimeout 

func WithScheduleToCloseTimeout(ctx Context, d time.Duration) Context

WithScheduleToCloseTimeout adds a timeout to the copy of the context. The current timeout resolution implementation is in seconds and uses math.Ceil(d.Seconds()) as the duration. But is subjected to change in the future.

func WithScheduleToStartTimeout 

func WithScheduleToStartTimeout(ctx Context, d time.Duration) Context

WithScheduleToStartTimeout adds a timeout to the copy of the context. The current timeout resolution implementation is in seconds and uses math.Ceil(d.Seconds()) as the duration. But is subjected to change in the future.

func WithStartToCloseTimeout 

func WithStartToCloseTimeout(ctx Context, d time.Duration) Context

WithStartToCloseTimeout adds a timeout to the copy of the context. The current timeout resolution implementation is in seconds and uses math.Ceil(d.Seconds()) as the duration. But is subjected to change in the future.

func WithTaskList 

func WithTaskList(ctx Context, name string) Context

WithTaskList adds a task list to the copy of the context.

func WithValue 

func WithValue(parent Context, key interface{}, val interface{}) Context

WithValue returns a copy of parent in which the value associated with key is val.

Use context Values only for request-scoped data that transits processes and APIs, not for passing optional parameters to functions.

func WithWaitForCancellation 

func WithWaitForCancellation(ctx Context, wait bool) Context

WithWaitForCancellation adds wait for the cacellation to the copy of the context.

func WithWorkflowDomain 

func WithWorkflowDomain(ctx Context, name string) Context

WithWorkflowDomain adds a domain to the context.

func WithWorkflowID 

func WithWorkflowID(ctx Context, workflowID string) Context

WithWorkflowID adds a workflowID to the context.

func WithWorkflowTaskList 

func WithWorkflowTaskList(ctx Context, name string) Context

WithWorkflowTaskList adds a task list to the context.

func WithWorkflowTaskStartToCloseTimeout 

func WithWorkflowTaskStartToCloseTimeout(ctx Context, d time.Duration) Context

WithWorkflowTaskStartToCloseTimeout adds a decision timeout to the context. The current timeout resolution implementation is in seconds and uses math.Ceil(d.Seconds()) as the duration. But is subjected to change in the future.

type ContextPropagator added in v0.8.4 

type ContextPropagator interface {
	// Inject injects information from a Go Context into headers
	Inject(context.Context, HeaderWriter) error

	// Extract extracts context information from headers and returns a context
	// object
	Extract(context.Context, HeaderReader) (context.Context, error)

	// InjectFromWorkflow injects information from workflow context into headers
	InjectFromWorkflow(Context, HeaderWriter) error

	// ExtractToWorkflow extracts context information from headers and returns
	// a workflow context
	ExtractToWorkflow(Context, HeaderReader) (Context, error)
}

ContextPropagator is an interface that determines what information from context to pass along

func NewTracingContextPropagator added in v0.8.4 

func NewTracingContextPropagator(logger *zap.Logger, tracer opentracing.Tracer) ContextPropagator

NewTracingContextPropagator returns new tracing context propagator object

type ContinueAsNewError 

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

ContinueAsNewError contains information about how to continue the workflow as new.

func NewContinueAsNewError 

func NewContinueAsNewError(ctx Context, wfn interface{}, args ...interface{}) *ContinueAsNewError

NewContinueAsNewError creates ContinueAsNewError instance If the workflow main function returns this error then the current execution is ended and the new execution with same workflow ID is started automatically with options provided to this function. 

 ctx - use context to override any options for the new workflow like execution timeout, decision task timeout, task list.
	  if not mentioned it would use the defaults that the current workflow is using.
       ctx := WithExecutionStartToCloseTimeout(ctx, 30 * time.Minute)
       ctx := WithWorkflowTaskStartToCloseTimeout(ctx, time.Minute)
	  ctx := WithWorkflowTaskList(ctx, "example-group")
 wfn - workflow function. for new execution it can be different from the currently running.
 args - arguments for the new workflow.

func (*ContinueAsNewError) Args added in v0.8.4 

func (e *ContinueAsNewError) Args() []interface{}

Args return workflow argument of the new run

func (*ContinueAsNewError) Error 

func (e *ContinueAsNewError) Error() string

Error from error interface

func (*ContinueAsNewError) WorkflowType added in v0.8.4 

func (e *ContinueAsNewError) WorkflowType() *WorkflowType

WorkflowType return workflowType of the new run

type CustomError 

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

CustomError returned from workflow and activity implementations with reason and optional details.

func NewCustomError 

func NewCustomError(reason string, details ...interface{}) *CustomError

NewCustomError create new instance of *CustomError with reason and optional details.

func (*CustomError) Details 

func (e *CustomError) Details(d ...interface{}) error

Details extracts strong typed detail data of this custom error. If there is no details, it will return ErrNoData.

func (*CustomError) Error 

func (e *CustomError) Error() string

Error from error interface

func (*CustomError) HasDetails added in v0.5.1 

func (e *CustomError) HasDetails() bool

HasDetails return if this error has strong typed detail data.

func (*CustomError) Reason 

func (e *CustomError) Reason() string

Reason gets the reason of this custom error

type DataConverter added in v0.9.0 

type DataConverter interface {
	// ToData implements conversion of a list of values.
	ToData(value ...interface{}) ([]byte, error)
	// FromData implements conversion of an array of values of different types.
	// Useful for deserializing arguments of function invocations.
	FromData(input []byte, valuePtr ...interface{}) error
}

DataConverter is used by the framework to serialize/deserialize input and output of activity/workflow that need to be sent over the wire. To encode/decode workflow arguments, one should set DataConverter in two places:

  1. Workflow worker, through worker.Options
  2. Client, through client.Options

To encode/decode Activity/ChildWorkflow arguments, one should set DataConverter in two places:

  1. Inside workflow code, use workflow.WithDataConverter to create new Context,

and pass that context to ExecuteActivity/ExecuteChildWorkflow calls. Cadence support using different DataConverters for different activity/childWorkflow in same workflow.

  1. Activity/Workflow worker that run these activity/childWorkflow, through worker.Options.

type DomainClient 

type DomainClient interface {
	// Register a domain with cadence server
	// The errors it can throw:
	//	- DomainAlreadyExistsError
	//	- BadRequestError
	//	- InternalServiceError
	Register(ctx context.Context, request *s.RegisterDomainRequest) error

	// Describe a domain. The domain has 3 part of information
	// DomainInfo - Which has Name, Status, Description, Owner Email
	// DomainConfiguration - Configuration like Workflow Execution Retention Period In Days, Whether to emit metrics.
	// ReplicationConfiguration - replication config like clusters and active cluster name
	// The errors it can throw:
	//	- EntityNotExistsError
	//	- BadRequestError
	//	- InternalServiceError
	Describe(ctx context.Context, name string) (*s.DescribeDomainResponse, error)

	// Update a domain.
	// The errors it can throw:
	//	- EntityNotExistsError
	//	- BadRequestError
	//	- InternalServiceError
	Update(ctx context.Context, request *s.UpdateDomainRequest) error
}

DomainClient is the client for managing operations on the domain. CLI, tools, ... can use this layer to manager operations on domain.

func NewDomainClient 

func NewDomainClient(service workflowserviceclient.Interface, options *ClientOptions) DomainClient

NewDomainClient creates an instance of a domain client, to manager lifecycle of domains.

type EncodedValue 

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

EncodedValue is type alias used to encapsulate/extract encoded result from workflow/activity.

func (EncodedValue) Get 

func (b EncodedValue) Get(valuePtr interface{}) error

Get extract data from encoded data to desired value type. valuePtr is pointer to the actual value type.

func (EncodedValue) HasValue added in v0.5.1 

func (b EncodedValue) HasValue() bool

HasValue return whether there is value

type EncodedValues 

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

EncodedValues is a type alias used to encapsulate/extract encoded arguments from workflow/activity.

func (EncodedValues) Get 

func (b EncodedValues) Get(valuePtr ...interface{}) error

Get extract data from encoded data to desired value type. valuePtr is pointer to the actual value type.

func (EncodedValues) HasValues added in v0.5.1 

func (b EncodedValues) HasValues() bool

HasValues return whether there are values

type ErrorDetailsValues added in v0.7.0 

type ErrorDetailsValues []interface{}

ErrorDetailsValues is a type alias used hold error details objects.

func (ErrorDetailsValues) Get added in v0.7.0 

func (b ErrorDetailsValues) Get(valuePtr ...interface{}) error

Get extract data from encoded data to desired value type. valuePtr is pointer to the actual value type.

func (ErrorDetailsValues) HasValues added in v0.7.0 

func (b ErrorDetailsValues) HasValues() bool

HasValues return whether there are values.

type Future 

type Future interface {
	// Get blocks until the future is ready. When ready it either returns non nil error or assigns result value to
	// the provided pointer.
	// Example:
	//  var v string
	//  if err := f.Get(ctx, &v); err != nil {
	//      return err
	//  }
	Get(ctx Context, valuePtr interface{}) error

	// When true Get is guaranteed to not block
	IsReady() bool
}

Future represents the result of an asynchronous computation.

func ExecuteActivity 

func ExecuteActivity(ctx Context, activity interface{}, args ...interface{}) Future

ExecuteActivity requests activity execution in the context of a workflow. Context can be used to pass the settings for this activity. For example: task list that this need to be routed, timeouts that need to be configured. Use ActivityOptions to pass down the options. 

 ao := ActivityOptions{
	    TaskList: "exampleTaskList",
	    ScheduleToStartTimeout: 10 * time.Second,
	    StartToCloseTimeout: 5 * time.Second,
	    ScheduleToCloseTimeout: 10 * time.Second,
	    HeartbeatTimeout: 0,
	}
	ctx := WithActivityOptions(ctx, ao)

Or to override a single option 

ctx := WithTaskList(ctx, "exampleTaskList")

Input activity is either an activity name (string) or a function representing an activity that is getting scheduled. Input args are the arguments that need to be passed to the scheduled activity.

If the activity failed to complete then the future get error would indicate the failure, and it can be one of CustomError, TimeoutError, CanceledError, PanicError, GenericError. You can cancel the pending activity using context(workflow.WithCancel(ctx)) and that will fail the activity with error CanceledError.

ExecuteActivity returns Future with activity result or failure.

func ExecuteLocalActivity added in v0.5.1 

func ExecuteLocalActivity(ctx Context, activity interface{}, args ...interface{}) Future

ExecuteLocalActivity requests to run a local activity. A local activity is like a regular activity with some key differences: * Local activity is scheduled and run by the workflow worker locally. * Local activity does not need Cadence server to schedule activity task and does not rely on activity worker. * No need to register local activity. * The parameter activity to ExecuteLocalActivity() must be a function. * Local activity is for short living activities (usually finishes within seconds). * Local activity cannot heartbeat.

Context can be used to pass the settings for this local activity. For now there is only one setting for timeout to be set: 

 lao := LocalActivityOptions{
	    ScheduleToCloseTimeout: 5 * time.Second,
	}
	ctx := WithLocalActivityOptions(ctx, lao)

The timeout here should be relative shorter than the DecisionTaskStartToCloseTimeout of the workflow. If you need a longer timeout, you probably should not use local activity and instead should use regular activity. Local activity is designed to be used for short living activities (usually finishes within seconds).

Input args are the arguments that will to be passed to the local activity. The input args will be hand over directly to local activity function without serialization/deserialization because we don't need to pass the input across process boundary. However, the result will still go through serialization/deserialization because we need to record the result as history to cadence server so if the workflow crashes, a different worker can replay the history without running the local activity again.

If the activity failed to complete then the future get error would indicate the failure, and it can be one of CustomError, TimeoutError, CanceledError, PanicError, GenericError. You can cancel the pending activity by cancel the context(workflow.WithCancel(ctx)) and that will fail the activity with error CanceledError.

ExecuteLocalActivity returns Future with local activity result or failure.

func NewTimer 

func NewTimer(ctx Context, d time.Duration) Future

NewTimer returns immediately and the future becomes ready after the specified duration d. The workflow needs to use this NewTimer() to get the timer instead of the Go lang library one(timer.NewTimer()). You can cancel the pending timer by cancel the Context (using context from workflow.WithCancel(ctx)) and that will cancel the timer. After timer is canceled, the returned Future become ready, and Future.Get() will return *CanceledError. The current timer resolution implementation is in seconds and uses math.Ceil(d.Seconds()) as the duration. But is subjected to change in the future.

func RequestCancelExternalWorkflow added in v0.5.1 

func RequestCancelExternalWorkflow(ctx Context, workflowID, runID string) Future

RequestCancelExternalWorkflow can be used to request cancellation of an external workflow. Input workflowID is the workflow ID of target workflow. Input runID indicates the instance of a workflow. Input runID is optional (default is ""). When runID is not specified, then the currently running instance of that workflowID will be used. By default, the current workflow's domain will be used as target domain. However, you can specify a different domain of the target workflow using the context like: 

ctx := WithWorkflowDomain(ctx, "domain-name")

RequestCancelExternalWorkflow return Future with failure or empty success result.

func SignalExternalWorkflow added in v0.5.1 

func SignalExternalWorkflow(ctx Context, workflowID, runID, signalName string, arg interface{}) Future

SignalExternalWorkflow can be used to send signal info to an external workflow. Input workflowID is the workflow ID of target workflow. Input runID indicates the instance of a workflow. Input runID is optional (default is ""). When runID is not specified, then the currently running instance of that workflowID will be used. By default, the current workflow's domain will be used as target domain. However, you can specify a different domain of the target workflow using the context like: 

ctx := WithWorkflowDomain(ctx, "domain-name")

SignalExternalWorkflow return Future with failure or empty success result.

type GenericError 

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

GenericError returned from workflow/workflow when the implementations return errors other than from NewCustomError() API.

func (*GenericError) Error 

func (e *GenericError) Error() string

Error from error interface

type HeaderReader added in v0.8.4 

type HeaderReader interface {
	ForEachKey(handler func(string, []byte) error) error
}

HeaderReader is an interface to read information from cadence headers

func NewHeaderReader added in v0.8.4 

func NewHeaderReader(header *shared.Header) HeaderReader

NewHeaderReader returns a header reader interface

type HeaderWriter added in v0.8.4 

type HeaderWriter interface {
	Set(string, []byte)
}

HeaderWriter is an interface to write information to cadence headers

func NewHeaderWriter added in v0.8.4 

func NewHeaderWriter(header *shared.Header) HeaderWriter

NewHeaderWriter returns a header writer interface

type HistoryEventIterator 

type HistoryEventIterator interface {
	// HasNext return whether this iterator has next value
	HasNext() bool
	// Next returns the next history events and error
	// The errors it can return:
	//	- EntityNotExistsError
	//	- BadRequestError
	//	- InternalServiceError
	Next() (*s.HistoryEvent, error)
}

HistoryEventIterator represents the interface for history event iterator

type HistoryIterator 

type HistoryIterator interface {
	// GetNextPage returns next page of history events
	GetNextPage() (*s.History, error)
	// Reset resets the internal state so next GetNextPage() call will return first page of events from beginning.
	Reset()
	// HasNextPage returns if there are more page of events
	HasNextPage() bool
}

HistoryIterator iterator through history events

type LocalActivityOptions added in v0.5.1 

type LocalActivityOptions struct {
	// ScheduleToCloseTimeout - The end to end timeout for the local activity.
	// This field is required.
	ScheduleToCloseTimeout time.Duration

	// RetryPolicy specify how to retry activity if error happens.
	// Optional: default is no retry
	RetryPolicy *RetryPolicy
}

LocalActivityOptions stores local activity specific parameters that will be stored inside of a context.

type MockCallWrapper 

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

MockCallWrapper is a wrapper to mock.Call. It offers the ability to wait on workflow's clock instead of wall clock.

func (*MockCallWrapper) After 

func (c *MockCallWrapper) After(d time.Duration) *MockCallWrapper

After sets how long to wait on workflow's clock before the mock call returns.

func (*MockCallWrapper) AfterFn added in v0.7.2 

func (c *MockCallWrapper) AfterFn(fn func() time.Duration) *MockCallWrapper

AfterFn sets a function which will tell how long to wait on workflow's clock before the mock call returns.

func (*MockCallWrapper) Once 

func (c *MockCallWrapper) Once() *MockCallWrapper

Once indicates that the mock should only return the value once.

func (*MockCallWrapper) Return 

func (c *MockCallWrapper) Return(returnArguments ...interface{}) *MockCallWrapper

Return specifies the return arguments for the expectation.

func (*MockCallWrapper) Run 

func (c *MockCallWrapper) Run(fn func(args mock.Arguments)) *MockCallWrapper

Run sets a handler to be called before returning. It can be used when mocking a method such as unmarshalers that takes a pointer to a struct and sets properties in such struct.

func (*MockCallWrapper) Times 

func (c *MockCallWrapper) Times(i int) *MockCallWrapper

Times indicates that the mock should only return the indicated number of times.

func (*MockCallWrapper) Twice 

func (c *MockCallWrapper) Twice() *MockCallWrapper

Twice indicates that the mock should only return the value twice.

type NonDeterministicWorkflowPolicy added in v0.7.0 

type NonDeterministicWorkflowPolicy int

NonDeterministicWorkflowPolicy is an enum for configuring how client's decision task handler deals with mismatched history events (presumably arising from non-deterministic workflow definitions). 

const (
	// NonDeterministicWorkflowPolicyBlockWorkflow is the default policy for handling detected non-determinism.
	// This option simply logs to console with an error message that non-determinism is detected, but
	// does *NOT* reply anything back to the server.
	// It is chosen as default for backward compatibility reasons because it preserves the old behavior
	// for handling non-determinism that we had before NonDeterministicWorkflowPolicy type was added to
	// allow more configurability.
	NonDeterministicWorkflowPolicyBlockWorkflow NonDeterministicWorkflowPolicy = iota
	// NonDeterministicWorkflowPolicyFailWorkflow behaves exactly the same as Ignore, up until the very
	// end of processing a decision task.
	// Whereas default does *NOT* reply anything back to the server, fail workflow replies back with a request
	// to fail the workflow execution.
	NonDeterministicWorkflowPolicyFailWorkflow

	// ReplayDomainName is domainName for replay because startEvent doesn't contain it
	ReplayDomainName = "ReplayDomain"
)

type PanicError 

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

PanicError contains information about panicked workflow/activity.

func (*PanicError) Error 

func (e *PanicError) Error() string

Error from error interface

func (*PanicError) StackTrace 

func (e *PanicError) StackTrace() string

StackTrace return stack trace of the panic

type RegisterActivityOptions 

type RegisterActivityOptions struct {
	Name string
}

RegisterActivityOptions consists of options for registering an activity

type RegisterWorkflowOptions 

type RegisterWorkflowOptions struct {
	Name string
}

RegisterWorkflowOptions consists of options for registering a workflow

type RetryPolicy added in v0.7.5 

type RetryPolicy struct {
	// Backoff interval for the first retry. If coefficient is 1.0 then it is used for all retries.
	// Required, no default value.
	InitialInterval time.Duration

	// Coefficient used to calculate the next retry backoff interval.
	// The next retry interval is previous interval multiplied by this coefficient.
	// Must be 1 or larger. Default is 2.0.
	BackoffCoefficient float64

	// Maximum backoff interval between retries. Exponential backoff leads to interval increase.
	// This value is the cap of the interval. Default is 100x of initial interval.
	MaximumInterval time.Duration

	// Maximum time to retry. Either ExpirationInterval or MaximumAttempts is required.
	// When exceeded the retries stop even if maximum retries is not reached yet.
	ExpirationInterval time.Duration

	// Maximum number of attempts. When exceeded the retries stop even if not expired yet.
	// If not set or set to 0, it means unlimited, and rely on ExpirationInterval to stop.
	// Either MaximumAttempts or ExpirationInterval is required.
	MaximumAttempts int32

	// Non-Retriable errors. This is optional. Cadence server will stop retry if error reason matches this list.
	// Error reason for custom error is specified when your activity/workflow return cadence.NewCustomError(reason).
	// Error reason for panic error is "cadenceInternal:Panic".
	// Error reason for any other error is "cadenceInternal:Generic".
	// Error reason for timeouts is: "cadenceInternal:Timeout TIMEOUT_TYPE". TIMEOUT_TYPE could be START_TO_CLOSE or HEARTBEAT.
	// Note, cancellation is not a failure, so it won't be retried.
	NonRetriableErrorReasons []string
}

RetryPolicy defines the retry policy. Note that the history of activity with retry policy will be different: the started event will be written down into history only when the activity completes or "finally" timeouts/fails. And the started event only records the last started time. Because of that, to check an activity has started or not, you cannot rely on history events. Instead, you can use CLI to describe the workflow to see the status of the activity: 

cadence --do <domain> wf desc -w <wf-id>

type Selector 

type Selector interface {
	AddReceive(c Channel, f func(c Channel, more bool)) Selector
	AddSend(c Channel, v interface{}, f func()) Selector
	AddFuture(future Future, f func(f Future)) Selector
	AddDefault(f func())
	Select(ctx Context)
}

Selector must be used instead of native go select by workflow code. Use workflow.NewSelector(ctx) method to create a Selector instance.

func NewNamedSelector 

func NewNamedSelector(ctx Context, name string) Selector

NewNamedSelector creates a new Selector instance with a given human readable name. Name appears in stack traces that are blocked on this Selector.

func NewSelector 

func NewSelector(ctx Context) Selector

NewSelector creates a new Selector instance.

type ServiceInvoker 

type ServiceInvoker interface {
	// Returns ActivityTaskCanceledError if activity is cancelled
	Heartbeat(details []byte) error
	Close(flushBufferedHeartbeat bool)
	GetClient(domain string, options *ClientOptions) Client
}

ServiceInvoker abstracts calls to the Cadence service from an activity implementation. Implement to unit test activities.

type SessionInfo added in v0.8.4 

type SessionInfo struct {
	SessionID string
	HostName  string
	// contains filtered or unexported fields
}

SessionInfo contains information of a created session. For now, exported fields are SessionID and HostName. SessionID is a uuid generated when CreateSession() or RecreateSession() is called and can be used to uniquely identify a session. HostName specifies which host is executing the session

func GetSessionInfo added in v0.8.4 

func GetSessionInfo(ctx Context) *SessionInfo

GetSessionInfo returns the sessionInfo stored in the context. If there are multiple sessions in the context, (for example, the same context is used to create, complete, create another session. Then user found that the session has failed, and created a new one on it), the most recent sessionInfo will be returned.

This API will return nil if there's no sessionInfo in the context.

func (*SessionInfo) GetRecreateToken added in v0.8.4 

func (s *SessionInfo) GetRecreateToken() []byte

GetRecreateToken returns the token needed to recreate a session. The returned value should be passed to RecreateSession() API.

type SessionOptions added in v0.8.4 

type SessionOptions struct {
	ExecutionTimeout time.Duration
	CreationTimeout  time.Duration
}

SessionOptions specifies metadata for a session. ExecutionTimeout: required, no default 

Specifies the maximum amount of time the session can run

CreationTimeout: required, no default 

Specfifies how long session creation can take before returning an error

type Settable 

type Settable interface {
	Set(value interface{}, err error)
	SetValue(value interface{})
	SetError(err error)
	Chain(future Future) // Value (or error) of the future become the same of the chained one.
}

Settable is used to set value or error on a future. See more: workflow.NewFuture(ctx).

type StartWorkflowOptions 

type StartWorkflowOptions struct {
	// ID - The business identifier of the workflow execution.
	// Optional: defaulted to a uuid.
	ID string

	// TaskList - The decisions of the workflow are scheduled on this queue.
	// This is also the default task list on which activities are scheduled. The workflow author can choose
	// to override this using activity options.
	// Mandatory: No default.
	TaskList string

	// ExecutionStartToCloseTimeout - The timeout for duration of workflow execution.
	// The resolution is seconds.
	// Mandatory: No default.
	ExecutionStartToCloseTimeout time.Duration

	// DecisionTaskStartToCloseTimeout - The timeout for processing decision task from the time the worker
	// pulled this task. If a decision task is lost, it is retried after this timeout.
	// The resolution is seconds.
	// Optional: defaulted to 10 secs.
	DecisionTaskStartToCloseTimeout time.Duration

	// WorkflowIDReusePolicy - Whether server allow reuse of workflow ID, can be useful
	// for dedup logic if set to WorkflowIdReusePolicyRejectDuplicate.
	// Optional: defaulted to WorkflowIDReusePolicyAllowDuplicateFailedOnly.
	WorkflowIDReusePolicy WorkflowIDReusePolicy

	// RetryPolicy - Optional retry policy for workflow. If a retry policy is specified, in case of workflow failure
	// server will start new workflow execution if needed based on the retry policy.
	RetryPolicy *RetryPolicy

	// CronSchedule - Optional cron schedule for workflow. If a cron schedule is specified, the workflow will run
	// as a cron based on the schedule. The scheduling will be based on UTC time. Schedule for next run only happen
	// after the current run is completed/failed/timeout. If a RetryPolicy is also supplied, and the workflow failed
	// or timeout, the workflow will be retried based on the retry policy. While the workflow is retrying, it won't
	// schedule its next run. If next schedule is due while workflow is running (or retrying), then it will skip that
	// schedule. Cron workflow will not stop until it is terminated or cancelled (by returning cadence.CanceledError).
	// The cron spec is as following:
	// ┌───────────── minute (0 - 59)
	// │ ┌───────────── hour (0 - 23)
	// │ │ ┌───────────── day of the month (1 - 31)
	// │ │ │ ┌───────────── month (1 - 12)
	// │ │ │ │ ┌───────────── day of the week (0 - 6) (Sunday to Saturday)
	// │ │ │ │ │
	// │ │ │ │ │
	// * * * * *
	CronSchedule string

	// Memo - Optional non-indexed info that will be shown in list workflow.
	Memo map[string]interface{}

	// SearchAttributes - Optional indexed info that can be used in query of List/Scan/Count workflow APIs (only
	// supported when Cadence server is using ElasticSearch). The key and value type must be registered on Cadence server side.
	// Use GetSearchAttributes API to get valid key and corresponding value type.
	SearchAttributes map[string]interface{}
}

StartWorkflowOptions configuration parameters for starting a workflow execution. The current timeout resolution implementation is in seconds and uses math.Ceil(d.Seconds()) as the duration. But is subjected to change in the future.

type TerminatedError 

type TerminatedError struct {
}

TerminatedError returned when workflow was terminated.

func (*TerminatedError) Error 

func (e *TerminatedError) Error() string

Error from error interface

type TestActivityEnvironment 

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

TestActivityEnvironment is the environment that you use to test activity

func (*TestActivityEnvironment) ExecuteActivity 

func (t *TestActivityEnvironment) ExecuteActivity(activityFn interface{}, args ...interface{}) (Value, error)

ExecuteActivity executes an activity. The tested activity will be executed synchronously in the calling goroutinue. Caller should use Value.Get() to extract strong typed result value.

func (*TestActivityEnvironment) ExecuteLocalActivity added in v0.5.1 

func (t *TestActivityEnvironment) ExecuteLocalActivity(activityFn interface{}, args ...interface{}) (Value, error)

ExecuteLocalActivity executes a local activity. The tested activity will be executed synchronously in the calling goroutinue. Caller should use Value.Get() to extract strong typed result value.

func (*TestActivityEnvironment) SetHeartbeatDetails added in v0.8.1 

func (t *TestActivityEnvironment) SetHeartbeatDetails(details interface{})

SetHeartbeatDetails sets the heartbeat details to be returned from activity.GetHeartbeatDetails()

func (*TestActivityEnvironment) SetTestTimeout added in v0.7.0 

func (t *TestActivityEnvironment) SetTestTimeout(idleTimeout time.Duration) *TestActivityEnvironment

SetTestTimeout sets the wall clock timeout for this activity test run. When test timeout happen, it means activity is taking too long.

func (*TestActivityEnvironment) SetWorkerOptions 

func (t *TestActivityEnvironment) SetWorkerOptions(options WorkerOptions) *TestActivityEnvironment

SetWorkerOptions sets the WorkerOptions that will be use by TestActivityEnvironment. TestActivityEnvironment will use options of Identity, MetricsScope and BackgroundActivityContext on the WorkerOptions. Other options are ignored. Note: WorkerOptions is defined in internal package, use public type worker.Options instead.

func (*TestActivityEnvironment) SetWorkerStopChannel added in v0.8.2 

func (t *TestActivityEnvironment) SetWorkerStopChannel(c chan struct{})

SetWorkerStopChannel sets the worker stop channel to be returned from activity.GetWorkerStopChannel(context) To test your activity on worker stop, you can provide a go channel with this function and call ExecuteActivity(). Then call close(channel) to test the activity worker stop logic.

type TestWorkflowEnvironment 

type TestWorkflowEnvironment struct {
	mock.Mock
	// contains filtered or unexported fields
}

TestWorkflowEnvironment is the environment that you use to test workflow

func (*TestWorkflowEnvironment) CancelWorkflow 

func (t *TestWorkflowEnvironment) CancelWorkflow()

CancelWorkflow requests cancellation (through workflow Context) to the currently running test workflow.

func (*TestWorkflowEnvironment) CompleteActivity 

func (t *TestWorkflowEnvironment) CompleteActivity(taskToken []byte, result interface{}, err error) error

CompleteActivity complete an activity that had returned activity.ErrResultPending error

func (*TestWorkflowEnvironment) ExecuteWorkflow 

func (t *TestWorkflowEnvironment) ExecuteWorkflow(workflowFn interface{}, args ...interface{})

ExecuteWorkflow executes a workflow, wait until workflow complete. It will fail the test if workflow is blocked and cannot complete within TestTimeout (set by SetTestTimeout()).

func (*TestWorkflowEnvironment) GetWorkflowError 

func (t *TestWorkflowEnvironment) GetWorkflowError() error

GetWorkflowError return the error from test workflow

func (*TestWorkflowEnvironment) GetWorkflowResult 

func (t *TestWorkflowEnvironment) GetWorkflowResult(valuePtr interface{}) error

GetWorkflowResult extracts the encoded result from test workflow, it returns error if the extraction failed.

func (*TestWorkflowEnvironment) IsWorkflowCompleted 

func (t *TestWorkflowEnvironment) IsWorkflowCompleted() bool

IsWorkflowCompleted check if test is completed or not

func (*TestWorkflowEnvironment) Now 

func (t *TestWorkflowEnvironment) Now() time.Time

Now returns the current workflow time (a.k.a workflow.Now() time) of this TestWorkflowEnvironment.

func (*TestWorkflowEnvironment) OnActivity 

func (t *TestWorkflowEnvironment) OnActivity(activity interface{}, args ...interface{}) *MockCallWrapper

OnActivity setup a mock call for activity. Parameter activity must be activity function (func) or activity name (string). You must call Return() with appropriate parameters on the returned *MockCallWrapper instance. The supplied parameters to the Return() call should either be a function that has exact same signature as the mocked activity, or it should be mock values with the same types as the mocked activity function returns. Example: assume the activity you want to mock has function signature as: 

func MyActivity(ctx context.Context, msg string) (string, error)

You can mock it by return a function with exact same signature: 

t.OnActivity(MyActivity, mock.Anything, mock.Anything).Return(func(ctx context.Context, msg string) (string, error) {
   // your mock function implementation
   return "", nil
})

OR return mock values with same types as activity function's return types: 

t.OnActivity(MyActivity, mock.Anything, mock.Anything).Return("mock_result", nil)

func (*TestWorkflowEnvironment) OnGetVersion added in v0.8.1 

func (t *TestWorkflowEnvironment) OnGetVersion(changeID string, minSupported, maxSupported Version) *MockCallWrapper

OnGetVersion setup a mock for workflow.GetVersion() call. By default, if mock is not setup, the GetVersion call from workflow code will always return the maxSupported version. Make it not possible to test old version branch. With this mock support, it is possible to test code branch for different versions.

Note: mock can be setup for a specific changeID. Or if mock.Anything is used as changeID then all calls to GetVersion will be mocked. Mock for a specific changeID has higher priority over mock.Anything.

func (*TestWorkflowEnvironment) OnRequestCancelExternalWorkflow added in v0.5.1 

func (t *TestWorkflowEnvironment) OnRequestCancelExternalWorkflow(domainName, workflowID, runID string) *MockCallWrapper

OnRequestCancelExternalWorkflow setup a mock for cancellation of external workflow. This TestWorkflowEnvironment handles cancellation of workflows that are started from the root workflow. For example, cancellation sent from parent to child workflows. Or cancellation between 2 child workflows. However, it does not know what to do if your tested workflow code is sending cancellation to external unknown workflows. In that case, you will need to setup mock for those cancel calls. Some examples of how to setup mock:

  • mock for specific target workflow that matches specific workflow ID and run ID env.OnRequestCancelExternalWorkflow("test-domain", "test-workflow-id1", "test-runid1").Return(nil).Once()
  • mock for anything and succeed the cancellation env.OnRequestCancelExternalWorkflow(mock.Anything, mock.Anything, mock.Anything).Return(nil).Once()
  • mock for anything and fail the cancellation env.OnRequestCancelExternalWorkflow(mock.Anything, mock.Anything, mock.Anything).Return(errors.New("unknown external workflow")).Once()
  • mock function for RequestCancelExternalWorkflow env.OnRequestCancelExternalWorkflow(mock.Anything, mock.Anything, mock.Anything).Return( func(domainName, workflowID, runID) error { // you can do differently based on the parameters return nil })

func (*TestWorkflowEnvironment) OnSignalExternalWorkflow added in v0.5.1 

func (t *TestWorkflowEnvironment) OnSignalExternalWorkflow(domainName, workflowID, runID, signalName, arg interface{}) *MockCallWrapper

OnSignalExternalWorkflow setup a mock for sending signal to external workflow. This TestWorkflowEnvironment handles sending signals between the workflows that are started from the root workflow. For example, sending signals between parent and child workflows. Or sending signals between 2 child workflows. However, it does not know what to do if your tested workflow code is sending signal to external unknown workflows. In that case, you will need to setup mock for those signal calls. Some examples of how to setup mock:

  • mock for specific target workflow that matches specific signal name and signal data env.OnSignalExternalWorkflow("test-domain", "test-workflow-id1", "test-runid1", "test-signal", "test-data").Return(nil).Once()
  • mock for anything and succeed the send env.OnSignalExternalWorkflow(mock.Anything, mock.Anything, mock.Anything, mock.Anything, mock.Anything).Return(nil).Once()
  • mock for anything and fail the send env.OnSignalExternalWorkflow(mock.Anything, mock.Anything, mock.Anything, mock.Anything, mock.Anything).Return(errors.New("unknown external workflow")).Once()
  • mock function for SignalExternalWorkflow env.OnSignalExternalWorkflow(mock.Anything, mock.Anything, mock.Anything, mock.Anything, mock.Anything).Return( func(domainName, workflowID, runID, signalName string, arg interface{}) error { // you can do differently based on the parameters return nil })

func (*TestWorkflowEnvironment) OnUpsertSearchAttributes added in v0.9.0 

func (t *TestWorkflowEnvironment) OnUpsertSearchAttributes(attributes map[string]interface{}) *MockCallWrapper

OnUpsertSearchAttributes setup a mock for workflow.UpsertSearchAttributes call. If mock is not setup, the UpsertSearchAttributes call will only validate input attributes. If mock is setup, all UpsertSearchAttributes calls in workflow have to be mocked.

func (*TestWorkflowEnvironment) OnWorkflow 

func (t *TestWorkflowEnvironment) OnWorkflow(workflow interface{}, args ...interface{}) *MockCallWrapper

OnWorkflow setup a mock call for workflow. Parameter workflow must be workflow function (func) or workflow name (string). You must call Return() with appropriate parameters on the returned *MockCallWrapper instance. The supplied parameters to the Return() call should either be a function that has exact same signature as the mocked workflow, or it should be mock values with the same types as the mocked workflow function returns. Example: assume the workflow you want to mock has function signature as: 

func MyChildWorkflow(ctx workflow.Context, msg string) (string, error)

You can mock it by return a function with exact same signature: 

t.OnWorkflow(MyChildWorkflow, mock.Anything, mock.Anything).Return(func(ctx workflow.Context, msg string) (string, error) {
   // your mock function implementation
   return "", nil
})

OR return mock values with same types as workflow function's return types: 

t.OnWorkflow(MyChildWorkflow, mock.Anything, mock.Anything).Return("mock_result", nil)

You could also setup mock to simulate start child workflow failure case by returning ErrMockStartChildWorkflowFailed as error.

func (*TestWorkflowEnvironment) QueryWorkflow 

func (t *TestWorkflowEnvironment) QueryWorkflow(queryType string, args ...interface{}) (Value, error)

QueryWorkflow queries to the currently running test workflow and returns result synchronously.

func (*TestWorkflowEnvironment) RegisterDelayedCallback 

func (t *TestWorkflowEnvironment) RegisterDelayedCallback(callback func(), delayDuration time.Duration)

RegisterDelayedCallback creates a new timer with specified delayDuration using workflow clock (not wall clock). When the timer fires, the callback will be called. By default, this test suite uses mock clock which automatically move forward to fire next timer when workflow is blocked. Use this API to make some event (like activity completion, signal or workflow cancellation) at desired time.

func (*TestWorkflowEnvironment) SetActivityTaskList 

func (t *TestWorkflowEnvironment) SetActivityTaskList(tasklist string, activityFn ...interface{})

SetActivityTaskList set the affinity between activity and tasklist. By default, activity can be invoked by any tasklist in this test environment. Use this SetActivityTaskList() to set affinity between activity and a tasklist. Once activity is set to a particular tasklist, that activity will only be available to that tasklist.

func (*TestWorkflowEnvironment) SetLastCompletionResult added in v0.8.1 

func (t *TestWorkflowEnvironment) SetLastCompletionResult(result interface{})

SetLastCompletionResult sets the result to be returned from workflow.GetLastCompletionResult().

func (*TestWorkflowEnvironment) SetMemoOnStart added in v0.9.0 

func (t *TestWorkflowEnvironment) SetMemoOnStart(memo map[string]interface{}) error

SetMemoOnStart sets the memo when start workflow.

func (*TestWorkflowEnvironment) SetOnActivityCanceledListener 

func (t *TestWorkflowEnvironment) SetOnActivityCanceledListener(
	listener func(activityInfo *ActivityInfo)) *TestWorkflowEnvironment

SetOnActivityCanceledListener sets a listener that will be called after an activity is canceled. Note: ActivityInfo is defined in internal package, use public type activity.Info instead.

func (*TestWorkflowEnvironment) SetOnActivityCompletedListener 

func (t *TestWorkflowEnvironment) SetOnActivityCompletedListener(
	listener func(activityInfo *ActivityInfo, result Value, err error)) *TestWorkflowEnvironment

SetOnActivityCompletedListener sets a listener that will be called after an activity is completed. Note: ActivityInfo is defined in internal package, use public type activity.Info instead.

func (*TestWorkflowEnvironment) SetOnActivityHeartbeatListener 

func (t *TestWorkflowEnvironment) SetOnActivityHeartbeatListener(
	listener func(activityInfo *ActivityInfo, details Values)) *TestWorkflowEnvironment

SetOnActivityHeartbeatListener sets a listener that will be called when activity heartbeat. Note: ActivityInfo is defined in internal package, use public type activity.Info instead.

func (*TestWorkflowEnvironment) SetOnActivityStartedListener 

func (t *TestWorkflowEnvironment) SetOnActivityStartedListener(
	listener func(activityInfo *ActivityInfo, ctx context.Context, args Values)) *TestWorkflowEnvironment

SetOnActivityStartedListener sets a listener that will be called before activity starts execution. Note: ActivityInfo is defined in internal package, use public type activity.Info instead.

func (*TestWorkflowEnvironment) SetOnChildWorkflowCanceledListener 

func (t *TestWorkflowEnvironment) SetOnChildWorkflowCanceledListener(
	listener func(workflowInfo *WorkflowInfo)) *TestWorkflowEnvironment

SetOnChildWorkflowCanceledListener sets a listener that will be called when a child workflow is canceled. Note: WorkflowInfo is defined in internal package, use public type workflow.Info instead.

func (*TestWorkflowEnvironment) SetOnChildWorkflowCompletedListener 

func (t *TestWorkflowEnvironment) SetOnChildWorkflowCompletedListener(
	listener func(workflowInfo *WorkflowInfo, result Value, err error)) *TestWorkflowEnvironment

SetOnChildWorkflowCompletedListener sets a listener that will be called after a child workflow is completed. Note: WorkflowInfo is defined in internal package, use public type workflow.Info instead.

func (*TestWorkflowEnvironment) SetOnChildWorkflowStartedListener 

func (t *TestWorkflowEnvironment) SetOnChildWorkflowStartedListener(
	listener func(workflowInfo *WorkflowInfo, ctx Context, args Values)) *TestWorkflowEnvironment

SetOnChildWorkflowStartedListener sets a listener that will be called before a child workflow starts execution. Note: WorkflowInfo is defined in internal package, use public type workflow.Info instead.

func (*TestWorkflowEnvironment) SetOnLocalActivityCanceledListener added in v0.5.1 

func (t *TestWorkflowEnvironment) SetOnLocalActivityCanceledListener(
	listener func(activityInfo *ActivityInfo)) *TestWorkflowEnvironment

SetOnLocalActivityCanceledListener sets a listener that will be called after local activity is canceled. Note: ActivityInfo is defined in internal package, use public type activity.Info instead.

func (*TestWorkflowEnvironment) SetOnLocalActivityCompletedListener added in v0.5.1 

func (t *TestWorkflowEnvironment) SetOnLocalActivityCompletedListener(
	listener func(activityInfo *ActivityInfo, result Value, err error)) *TestWorkflowEnvironment

SetOnLocalActivityCompletedListener sets a listener that will be called after local activity is completed. Note: ActivityInfo is defined in internal package, use public type activity.Info instead.

func (*TestWorkflowEnvironment) SetOnLocalActivityStartedListener added in v0.5.1 

func (t *TestWorkflowEnvironment) SetOnLocalActivityStartedListener(
	listener func(activityInfo *ActivityInfo, ctx context.Context, args []interface{})) *TestWorkflowEnvironment

SetOnLocalActivityStartedListener sets a listener that will be called before local activity starts execution. Note: ActivityInfo is defined in internal package, use public type activity.Info instead.

func (*TestWorkflowEnvironment) SetOnTimerCancelledListener 

func (t *TestWorkflowEnvironment) SetOnTimerCancelledListener(listener func(timerID string)) *TestWorkflowEnvironment

SetOnTimerCancelledListener sets a listener that will be called after a timer is cancelled

func (*TestWorkflowEnvironment) SetOnTimerFiredListener 

func (t *TestWorkflowEnvironment) SetOnTimerFiredListener(listener func(timerID string)) *TestWorkflowEnvironment

SetOnTimerFiredListener sets a listener that will be called after a timer is fired.

func (*TestWorkflowEnvironment) SetOnTimerScheduledListener 

func (t *TestWorkflowEnvironment) SetOnTimerScheduledListener(
	listener func(timerID string, duration time.Duration)) *TestWorkflowEnvironment

SetOnTimerScheduledListener sets a listener that will be called before a timer is scheduled.

func (*TestWorkflowEnvironment) SetSearchAttributesOnStart added in v0.9.0 

func (t *TestWorkflowEnvironment) SetSearchAttributesOnStart(searchAttributes map[string]interface{}) error

SetSearchAttributesOnStart sets the search attributes when start workflow.

func (*TestWorkflowEnvironment) SetStartTime added in v0.6.1 

func (t *TestWorkflowEnvironment) SetStartTime(startTime time.Time)

SetStartTime sets the start time of the workflow. This is optional, default start time will be the wall clock time when workflow starts. Start time is the workflow.Now(ctx) time at the beginning of the workflow.

func (*TestWorkflowEnvironment) SetTestTimeout 

func (t *TestWorkflowEnvironment) SetTestTimeout(idleTimeout time.Duration) *TestWorkflowEnvironment

SetTestTimeout sets the idle timeout based on wall clock for this tested workflow. Idle is when workflow is blocked waiting on events (including timer, activity, child workflow, signal etc). If there is no event happening longer than this idle timeout, the test framework would stop the workflow and return timeout error. This is based on real wall clock time, not the workflow time (a.k.a workflow.Now() time).

func (*TestWorkflowEnvironment) SetWorkerOptions 

func (t *TestWorkflowEnvironment) SetWorkerOptions(options WorkerOptions) *TestWorkflowEnvironment

SetWorkerOptions sets the WorkerOptions for TestWorkflowEnvironment. TestWorkflowEnvironment will use options set by use options of Identity, MetricsScope and BackgroundActivityContext on the WorkerOptions. Other options are ignored. Note: WorkerOptions is defined in internal package, use public type worker.Options instead.

func (*TestWorkflowEnvironment) SetWorkerStopChannel added in v0.8.2 

func (t *TestWorkflowEnvironment) SetWorkerStopChannel(c chan struct{})

SetWorkerStopChannel sets the activity worker stop channel to be returned from activity.GetWorkerStopChannel(context) You can use this function to set the activity worker stop channel and use close(channel) to test your activity execution from workflow execution.

func (*TestWorkflowEnvironment) SetWorkflowTimeout added in v0.7.5 

func (t *TestWorkflowEnvironment) SetWorkflowTimeout(executionTimeout time.Duration) *TestWorkflowEnvironment

SetWorkflowTimeout sets the execution timeout for this tested workflow. This test framework uses mock clock internally and when workflow is blocked on timer, it will auto forward the mock clock. Use SetWorkflowTimeout() to enforce a workflow execution timeout to return timeout error when the workflow mock clock is moved head of the timeout. This is based on the workflow time (a.k.a workflow.Now() time).

func (*TestWorkflowEnvironment) SignalWorkflow 

func (t *TestWorkflowEnvironment) SignalWorkflow(name string, input interface{})

SignalWorkflow sends signal to the currently running test workflow.

func (*TestWorkflowEnvironment) SignalWorkflowByID added in v0.7.5 

func (t *TestWorkflowEnvironment) SignalWorkflowByID(workflowID, signalName string, input interface{}) error

SignalWorkflowByID sends signal to the currently running test workflow.

func (*TestWorkflowEnvironment) SignalWorkflowSkippingDecision added in v0.8.4 

func (t *TestWorkflowEnvironment) SignalWorkflowSkippingDecision(name string, input interface{})

SignalWorkflowSkippingDecision sends signal to the currently running test workflow without invoking workflow code. Used to test processing of multiple buffered signals before completing workflow. It must be followed by SignalWorkflow, CancelWorkflow or CompleteActivity to force a decision.

type TimeoutError 

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

TimeoutError returned when activity or child workflow timed out.

func NewHeartbeatTimeoutError 

func NewHeartbeatTimeoutError(details ...interface{}) *TimeoutError

NewHeartbeatTimeoutError creates TimeoutError instance

func NewTimeoutError 

func NewTimeoutError(timeoutType shared.TimeoutType, details ...interface{}) *TimeoutError

NewTimeoutError creates TimeoutError instance. Use NewHeartbeatTimeoutError to create heartbeat TimeoutError

func (*TimeoutError) Details 

func (e *TimeoutError) Details(d ...interface{}) error

Details extracts strong typed detail data of this error. If there is no details, it will return ErrNoData.

func (*TimeoutError) Error 

func (e *TimeoutError) Error() string

Error from error interface

func (*TimeoutError) HasDetails added in v0.5.1 

func (e *TimeoutError) HasDetails() bool

HasDetails return if this error has strong typed detail data.

func (*TimeoutError) TimeoutType 

func (e *TimeoutError) TimeoutType() shared.TimeoutType

TimeoutType return timeout type of this error

type UnknownExternalWorkflowExecutionError added in v0.8.1 

type UnknownExternalWorkflowExecutionError struct{}

UnknownExternalWorkflowExecutionError can be returned when external workflow doesn't exist

func (*UnknownExternalWorkflowExecutionError) Error added in v0.8.1 

func (e *UnknownExternalWorkflowExecutionError) Error() string

Error from error interface

type Value added in v0.9.0 

type Value interface {
	// HasValue return whether there is value encoded.
	HasValue() bool
	// Get extract the encoded value into strong typed value pointer.
	Get(valuePtr interface{}) error
}

Value is used to encapsulate/extract encoded value from workflow/activity.

func MutableSideEffect added in v0.6.1 

func MutableSideEffect(ctx Context, id string, f func(ctx Context) interface{}, equals func(a, b interface{}) bool) Value

MutableSideEffect executes the provided function once, then it looks up the history for the value with the given id. If there is no existing value, then it records the function result as a value with the given id on history; otherwise, it compares whether the existing value from history has changed from the new function result by calling the provided equals function. If they are equal, it returns the value without recording a new one in history; 

otherwise, it records the new value with the same id on history.

Caution: do not use MutableSideEffect to modify closures. Always retrieve result from MutableSideEffect's encoded return value.

The difference between MutableSideEffect() and SideEffect() is that every new SideEffect() call in non-replay will result in a new marker being recorded on history. However, MutableSideEffect() only records a new marker if the value changed. During replay, MutableSideEffect() will not execute the function again, but it will return the exact same value as it was returning during the non-replay run.

One good use case of MutableSideEffect() is to access dynamically changing config without breaking determinism.

func NewValue added in v0.6.1 

func NewValue(data []byte) Value

NewValue creates a new encoded.Value which can be used to decode binary data returned by Cadence. For example: User had Activity.RecordHeartbeat(ctx, "my-heartbeat") and then got response from calling Client.DescribeWorkflowExecution. The response contains binary field PendingActivityInfo.HeartbeatDetails, which can be decoded by using: 

var result string // This need to be same type as the one passed to RecordHeartbeat
NewValue(data).Get(&result)

func SideEffect 

func SideEffect(ctx Context, f func(ctx Context) interface{}) Value

SideEffect executes the provided function once, records its result into the workflow history. The recorded result on history will be returned without executing the provided function during replay. This guarantees the deterministic requirement for workflow as the exact same result will be returned in replay. Common use case is to run some short non-deterministic code in workflow, like getting random number or new UUID. The only way to fail SideEffect is to panic which causes decision task failure. The decision task after timeout is rescheduled and re-executed giving SideEffect another chance to succeed.

Caution: do not use SideEffect to modify closures. Always retrieve result from SideEffect's encoded return value. For example this code is BROKEN: 

// Bad example:
var random int
workflow.SideEffect(func(ctx workflow.Context) interface{} {
       random = rand.Intn(100)
       return nil
})
// random will always be 0 in replay, thus this code is non-deterministic
if random < 50 {
       ....
} else {
       ....
}

On replay the provided function is not executed, the random will always be 0, and the workflow could takes a different path breaking the determinism.

Here is the correct way to use SideEffect: 

// Good example:
encodedRandom := SideEffect(func(ctx workflow.Context) interface{} {
      return rand.Intn(100)
})
var random int
encodedRandom.Get(&random)
if random < 50 {
       ....
} else {
       ....
}

type Values added in v0.9.0 

type Values interface {
	// HasValues return whether there are values encoded.
	HasValues() bool
	// Get extract the encoded values into strong typed value pointers.
	Get(valuePtr ...interface{}) error
}

Values is used to encapsulate/extract encoded one or more values from workflow/activity.

func NewValues added in v0.6.1 

func NewValues(data []byte) Values

NewValues creates a new encoded.Values which can be used to decode binary data returned by Cadence. For example: User had Activity.RecordHeartbeat(ctx, "my-heartbeat", 123) and then got response from calling Client.DescribeWorkflowExecution. The response contains binary field PendingActivityInfo.HeartbeatDetails, which can be decoded by using: 

var result1 string
var result2 int // These need to be same type as those arguments passed to RecordHeartbeat
NewValues(data).Get(&result1, &result2)

type Version 

type Version int

Version represents a change version. See GetVersion call. 

const DefaultVersion Version = -1

DefaultVersion is a version returned by GetVersion for code that wasn't versioned before

func GetVersion 

func GetVersion(ctx Context, changeID string, minSupported, maxSupported Version) Version

GetVersion is used to safely perform backwards incompatible changes to workflow definitions. It is not allowed to update workflow code while there are workflows running as it is going to break determinism. The solution is to have both old code that is used to replay existing workflows as well as the new one that is used when it is executed for the first time. GetVersion returns maxSupported version when is executed for the first time. This version is recorded into the workflow history as a marker event. Even if maxSupported version is changed the version that was recorded is returned on replay. DefaultVersion constant contains version of code that wasn't versioned before. For example initially workflow has the following code: 

err = workflow.ExecuteActivity(ctx, foo).Get(ctx, nil)

it should be updated to 

err = workflow.ExecuteActivity(ctx, bar).Get(ctx, nil)

The backwards compatible way to execute the update is 

v :=  GetVersion(ctx, "fooChange", DefaultVersion, 1)
if v  == DefaultVersion {
    err = workflow.ExecuteActivity(ctx, foo).Get(ctx, nil)
} else {
    err = workflow.ExecuteActivity(ctx, bar).Get(ctx, nil)
}

Then bar has to be changed to baz: 

v :=  GetVersion(ctx, "fooChange", DefaultVersion, 2)
if v  == DefaultVersion {
    err = workflow.ExecuteActivity(ctx, foo).Get(ctx, nil)
} else if v == 1 {
    err = workflow.ExecuteActivity(ctx, bar).Get(ctx, nil)
} else {
    err = workflow.ExecuteActivity(ctx, baz).Get(ctx, nil)
}

Later when there are no workflow executions running DefaultVersion the correspondent branch can be removed: 

v :=  GetVersion(ctx, "fooChange", 1, 2)
if v == 1 {
    err = workflow.ExecuteActivity(ctx, bar).Get(ctx, nil)
} else {
    err = workflow.ExecuteActivity(ctx, baz).Get(ctx, nil)
}

It is recommended to keep the GetVersion() call even if single branch is left: 

GetVersion(ctx, "fooChange", 2, 2)
err = workflow.ExecuteActivity(ctx, baz).Get(ctx, nil)

The reason to keep it is: 1) it ensures that if there is older version execution still running, it will fail here and not proceed; 2) if you ever need to make more changes for “fooChange”, for example change activity from baz to qux, you just need to update the maxVersion from 2 to 3.

Note that, you only need to preserve the first call to GetVersion() for each changeID. All subsequent call to GetVersion() with same changeID are safe to remove. However, if you really want to get rid of the first GetVersion() call as well, you can do so, but you need to make sure: 1) all older version executions are completed; 2) you can no longer use “fooChange” as changeID. If you ever need to make changes to that same part like change from baz to qux, you would need to use a different changeID like “fooChange-fix2”, and start minVersion from DefaultVersion again. The code would looks like: 

v := workflow.GetVersion(ctx, "fooChange-fix2", workflow.DefaultVersion, 1)
if v == workflow.DefaultVersion {
  err = workflow.ExecuteActivity(ctx, baz, data).Get(ctx, nil)
} else {
  err = workflow.ExecuteActivity(ctx, qux, data).Get(ctx, nil)
}

type WaitGroup added in v0.9.0 

type WaitGroup interface {
	Add(delta int)
	Done()
	Wait(ctx Context)
}

WaitGroup must be used instead of native go sync.WaitGroup by workflow code. Use workflow.NewWaitGroup(ctx) method to create a new WaitGroup instance

func NewWaitGroup added in v0.9.0 

func NewWaitGroup(ctx Context) WaitGroup

NewWaitGroup creates a new WaitGroup instance.

type Worker 

type Worker interface {
	// Start starts the worker in a non-blocking fashion
	Start() error
	// Run is a blocking start and cleans up resources when killed
	// returns error only if it fails to start the worker
	Run() error
	// Stop cleans up any resources opened by worker
	Stop()
}

Worker represents objects that can be started and stopped.

func NewWorker 

func NewWorker(
	service workflowserviceclient.Interface,
	domain string,
	taskList string,
	options WorkerOptions,
) Worker

NewWorker creates an instance of worker for managing workflow and activity executions. service - thrift connection to the cadence server. domain - the name of the cadence domain. taskList - is the task list name you use to identify your client worker, also 

identifies group of workflow and activity implementations that are hosted by a single worker process.

options - configure any worker specific options like logger, metrics, identity.

type WorkerOptions 

type WorkerOptions struct {
	// Optional: To set the maximum concurrent activity executions this worker can have.
	// The zero value of this uses the default value.
	// default: defaultMaxConcurrentActivityExecutionSize(1k)
	MaxConcurrentActivityExecutionSize int

	// Optional: Sets the rate limiting on number of activities that can be executed per second per
	// worker. This can be used to limit resources used by the worker.
	// Notice that the number is represented in float, so that you can set it to less than
	// 1 if needed. For example, set the number to 0.1 means you want your activity to be executed
	// once for every 10 seconds. This can be used to protect down stream services from flooding.
	// The zero value of this uses the default value. Default: 100k
	WorkerActivitiesPerSecond float64

	// Optional: To set the maximum concurrent local activity executions this worker can have.
	// The zero value of this uses the default value.
	// default: 1k
	MaxConcurrentLocalActivityExecutionSize int

	// Optional: Sets the rate limiting on number of local activities that can be executed per second per
	// worker. This can be used to limit resources used by the worker.
	// Notice that the number is represented in float, so that you can set it to less than
	// 1 if needed. For example, set the number to 0.1 means you want your local activity to be executed
	// once for every 10 seconds. This can be used to protect down stream services from flooding.
	// The zero value of this uses the default value. Default: 100k
	WorkerLocalActivitiesPerSecond float64

	// Optional: Sets the rate limiting on number of activities that can be executed per second.
	// This is managed by the server and controls activities per second for your entire tasklist
	// whereas WorkerActivityTasksPerSecond controls activities only per worker.
	// Notice that the number is represented in float, so that you can set it to less than
	// 1 if needed. For example, set the number to 0.1 means you want your activity to be executed
	// once for every 10 seconds. This can be used to protect down stream services from flooding.
	// The zero value of this uses the default value. Default: 100k
	TaskListActivitiesPerSecond float64

	// Optional: To set the maximum concurrent decision task executions this worker can have.
	// The zero value of this uses the default value.
	// default: defaultMaxConcurrentTaskExecutionSize(1k)
	MaxConcurrentDecisionTaskExecutionSize int

	// Optional: Sets the rate limiting on number of decision tasks that can be executed per second per
	// worker. This can be used to limit resources used by the worker.
	// The zero value of this uses the default value. Default: 100k
	WorkerDecisionTasksPerSecond float64

	// Optional: if the activities need auto heart beating for those activities
	// by the framework
	// default: false not to heartbeat.
	AutoHeartBeat bool

	// Optional: Sets an identify that can be used to track this host for debugging.
	// default: default identity that include hostname, groupName and process ID.
	Identity string

	// Optional: Metrics to be reported. Metrics emitted by the cadence client are not prometheus compatible by
	// default. To ensure metrics are compatible with prometheus make sure to create tally scope with sanitizer
	// options set.
	// var (
	// _safeCharacters = []rune{'_'}
	// _sanitizeOptions = tally.SanitizeOptions{
	// 	NameCharacters: tally.ValidCharacters{
	// 		Ranges:     tally.AlphanumericRange,
	// 		Characters: _safeCharacters,
	// 	},
	// 		KeyCharacters: tally.ValidCharacters{
	// 			Ranges:     tally.AlphanumericRange,
	// 			Characters: _safeCharacters,
	// 		},
	// 		ValueCharacters: tally.ValidCharacters{
	// 			Ranges:     tally.AlphanumericRange,
	// 			Characters: _safeCharacters,
	// 		},
	// 		ReplacementCharacter: tally.DefaultReplacementCharacter,
	// 	}
	// )
	// opts := tally.ScopeOptions{
	// 	Reporter:        reporter,
	// 	SanitizeOptions: &_sanitizeOptions,
	// }
	// scope, _ := tally.NewRootScope(opts, time.Second)
	// default: no metrics.
	MetricsScope tally.Scope

	// Optional: Logger framework can use to log.
	// default: default logger provided.
	Logger *zap.Logger

	// Optional: Enable logging in replay.
	// In the workflow code you can use workflow.GetLogger(ctx) to write logs. By default, the logger will skip log
	// entry during replay mode so you won't see duplicate logs. This option will enable the logging in replay mode.
	// This is only useful for debugging purpose.
	// default: false
	EnableLoggingInReplay bool

	// Optional: Disable running workflow workers.
	// default: false
	DisableWorkflowWorker bool

	// Optional: Disable running activity workers.
	// default: false
	DisableActivityWorker bool

	// Optional: Disable sticky execution.
	// default: false
	// Sticky Execution is to run the decision tasks for one workflow execution on same worker host. This is an
	// optimization for workflow execution. When sticky execution is enabled, worker keeps the workflow state in
	// memory. New decision task contains the new history events will be dispatched to the same worker. If this
	// worker crashes, the sticky decision task will timeout after StickyScheduleToStartTimeout, and cadence server
	// will clear the stickiness for that workflow execution and automatically reschedule a new decision task that
	// is available for any worker to pick up and resume the progress.
	DisableStickyExecution bool

	// Optional: Sticky schedule to start timeout.
	// default: 5s
	// The resolution is seconds. See details about StickyExecution on the comments for DisableStickyExecution.
	StickyScheduleToStartTimeout time.Duration

	// Optional: sets context for activity. The context can be used to pass any configuration to activity
	// like common logger for all activities.
	BackgroundActivityContext context.Context

	// Optional: Sets how decision worker deals with non-deterministic history events
	// (presumably arising from non-deterministic workflow definitions or non-backward compatible workflow definition changes).
	// default: NonDeterministicWorkflowPolicyBlockWorkflow, which just logs error but reply nothing back to server
	NonDeterministicWorkflowPolicy NonDeterministicWorkflowPolicy

	// Optional: Sets DataConverter to customize serialization/deserialization of arguments in Cadence
	// default: defaultDataConverter, an combination of thriftEncoder and jsonEncoder
	DataConverter DataConverter

	// Optional: worker graceful shutdown timeout
	// default: 0s
	WorkerStopTimeout time.Duration

	// Optional: Enable running session workers.
	// Session workers is for activities within a session.
	// Enable this option to allow worker to process sessions.
	// default: false
	EnableSessionWorker bool

	// Optional: Sets the maximum number of concurrently running sessions the resource support.
	// default: 1000
	MaxConcurrentSessionExecutionSize int

	// Optional: Sets ContextPropagators that allows users to control the context information passed through a workflow
	// default: no ContextPropagators
	ContextPropagators []ContextPropagator

	// Optional: Sets opentracing Tracer that is to be used to emit tracing information
	// default: no tracer - opentracing.NoopTracer
	Tracer opentracing.Tracer
}

WorkerOptions is used to configure a worker instance. The current timeout resolution implementation is in seconds and uses math.Ceil(d.Seconds()) as the duration. But is subjected to change in the future.

type WorkflowExecution 

type WorkflowExecution struct {
	ID    string
	RunID string
}

WorkflowExecution Details.

type WorkflowExecutionContext added in v0.7.1 

type WorkflowExecutionContext interface {
	Lock()
	Unlock(err error)
	ProcessWorkflowTask(workflowTask *workflowTask) (completeRequest interface{}, err error)
	ProcessLocalActivityResult(workflowTask *workflowTask, lar *localActivityResult) (interface{}, error)
	// CompleteDecisionTask try to complete current decision task and get response that needs to be sent back to server.
	// The waitLocalActivity is used to control if we should wait for outstanding local activities.
	// If there is no outstanding local activities or if waitLocalActivity is false, the complete will return response
	// which will be one of following:
	// - RespondDecisionTaskCompletedRequest
	// - RespondDecisionTaskFailedRequest
	// - RespondQueryTaskCompletedRequest
	// If waitLocalActivity is true, and there is outstanding local activities, this call will return nil.
	CompleteDecisionTask(workflowTask *workflowTask, waitLocalActivity bool) interface{}
	// GetDecisionTimeout returns the TaskStartToCloseTimeout
	GetDecisionTimeout() time.Duration
	GetCurrentDecisionTask() *s.PollForDecisionTaskResponse
	IsDestroyed() bool
	StackTrace() string
}

WorkflowExecutionContext represents one instance of workflow execution state in memory. Lock must be obtained before calling into any methods.

type WorkflowIDReusePolicy 

type WorkflowIDReusePolicy int

WorkflowIDReusePolicy defines workflow ID reuse behavior. 

const (
	// WorkflowIDReusePolicyAllowDuplicateFailedOnly allow start a workflow execution
	// when workflow not running, and the last execution close state is in
	// [terminated, cancelled, timeouted, failed].
	WorkflowIDReusePolicyAllowDuplicateFailedOnly WorkflowIDReusePolicy = iota

	// WorkflowIDReusePolicyAllowDuplicate allow start a workflow execution using
	// the same workflow ID,when workflow not running.
	WorkflowIDReusePolicyAllowDuplicate

	// WorkflowIDReusePolicyRejectDuplicate do not allow start a workflow execution using the same workflow ID at all
	WorkflowIDReusePolicyRejectDuplicate
)

type WorkflowInfo 

type WorkflowInfo struct {
	WorkflowExecution                   WorkflowExecution
	WorkflowType                        WorkflowType
	TaskListName                        string
	ExecutionStartToCloseTimeoutSeconds int32
	TaskStartToCloseTimeoutSeconds      int32
	Domain                              string
	Attempt                             int32 // Attempt starts from 0 and increased by 1 for every retry if retry policy is specified.

	CronSchedule            *string
	ContinuedExecutionRunID *string
	ParentWorkflowDomain    *string
	ParentWorkflowExecution *WorkflowExecution
	Memo                    *s.Memo
	SearchAttributes        *s.SearchAttributes
	// contains filtered or unexported fields
}

WorkflowInfo information about currently executing workflow

func GetWorkflowInfo 

func GetWorkflowInfo(ctx Context) *WorkflowInfo

GetWorkflowInfo extracts info of a current workflow from a context.

type WorkflowRun 

type WorkflowRun interface {
	// GetID return workflow ID, which will be same as StartWorkflowOptions.ID if provided.
	GetID() string

	// GetRunID return the first started workflow run ID (please see below)
	GetRunID() string

	// Get will fill the workflow execution result to valuePtr,
	// if workflow execution is a success, or return corresponding,
	// error. This is a blocking API.
	Get(ctx context.Context, valuePtr interface{}) error
}

WorkflowRun represents a started non child workflow

type WorkflowTaskHandler 

type WorkflowTaskHandler interface {
	// Processes the workflow task
	// The response could be:
	// - RespondDecisionTaskCompletedRequest
	// - RespondDecisionTaskFailedRequest
	// - RespondQueryTaskCompletedRequest
	ProcessWorkflowTask(
		task *workflowTask,
		f decisionHeartbeatFunc,
	) (response interface{}, err error)
}

WorkflowTaskHandler represents decision task handlers.

type WorkflowTestSuite 

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

WorkflowTestSuite is the test suite to run unit tests for workflow/activity.

func (*WorkflowTestSuite) GetLogger 

func (s *WorkflowTestSuite) GetLogger() *zap.Logger

GetLogger gets the logger for this WorkflowTestSuite.

func (*WorkflowTestSuite) NewTestActivityEnvironment 

func (s *WorkflowTestSuite) NewTestActivityEnvironment() *TestActivityEnvironment

NewTestActivityEnvironment creates a new instance of TestActivityEnvironment. Use the returned TestActivityEnvironment to run your activity in the test environment.

func (*WorkflowTestSuite) NewTestWorkflowEnvironment 

func (s *WorkflowTestSuite) NewTestWorkflowEnvironment() *TestWorkflowEnvironment

NewTestWorkflowEnvironment creates a new instance of TestWorkflowEnvironment. Use the returned TestWorkflowEnvironment to run your workflow in the test environment.

func (*WorkflowTestSuite) SetContextPropagators added in v0.8.4 

func (s *WorkflowTestSuite) SetContextPropagators(ctxProps []ContextPropagator)

SetContextPropagators sets the context propagators for this WorkflowTestSuite. If you don't set context propagators, test suite will not use context propagators

func (*WorkflowTestSuite) SetHeader added in v0.8.4 

func (s *WorkflowTestSuite) SetHeader(header *shared.Header)

SetHeader sets the headers for this WorkflowTestSuite. If you don't set header, test suite will not pass headers to the workflow

func (*WorkflowTestSuite) SetLogger 

func (s *WorkflowTestSuite) SetLogger(logger *zap.Logger)

SetLogger sets the logger for this WorkflowTestSuite. If you don't set logger, test suite will create a default logger with Debug level logging enabled.

func (*WorkflowTestSuite) SetMetricsScope 

func (s *WorkflowTestSuite) SetMetricsScope(scope tally.Scope)

SetMetricsScope sets the metrics scope for this WorkflowTestSuite. If you don't set scope, test suite will use tally.NoopScope

type WorkflowType 

type WorkflowType struct {
	Name string
}

WorkflowType identifies a workflow type.

Source Files

View all Source files

Directories

Path Synopsis
cmd
dummy
This file exists to force compilation of all code that doesn't have unit tests.
 This file exists to force compilation of all code that doesn't have unit tests.
tools/copyright
backoff
cache
metrics
util

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