client

package
v1.14.0 Latest Latest
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 Go to latest Published: Mar 10, 2022 License: MIT Imports: 7 Imported by: 913

Documentation

Overview

Package client is used by external programs to communicate with Temporal service. NOTE: DO NOT USE THIS API INSIDE OF ANY WORKFLOW CODE!!!

Index

Constants

View Source 
const (
	// DefaultHostPort is the host:port which is used if not passed with options.
	DefaultHostPort = internal.LocalHostPort

	// DefaultNamespace is the namespace name which is used if not passed with options.
	DefaultNamespace = internal.DefaultNamespace

	// 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 converter.EncodedValue.
	QueryTypeStackTrace string = internal.QueryTypeStackTrace

	// 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 converter.EncodedValue.
	QueryTypeOpenSessions string = internal.QueryTypeOpenSessions
)

Variables

View Source 
var MetricsNopHandler = metrics.NopHandler

MetricsNopHandler is a noop handler that does nothing with the metrics.

Functions

func NewValue 

func NewValue(data *commonpb.Payloads) converter.EncodedValue

NewValue creates a new converter.EncodedValue which can be used to decode binary data returned by Temporal. 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 NewValues 

func NewValues(data *commonpb.Payloads) converter.EncodedValues

NewValues creates a new converter.EncodedValues which can be used to decode binary data returned by Temporal. 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)

func NewWorkflowServiceProxyServer added in v1.14.0 

func NewWorkflowServiceProxyServer(options WorkflowServiceProxyOptions) (workflowservice.WorkflowServiceServer, error)

NewWorkflowServiceProxyServer creates a WorkflowServiceServer suitable for registering with a GRPC Server. Requests will be forwarded to the passed in WorkflowService Client. GRPC interceptors can be added on the Server or Client to adjust requests and responses.

Types

type Client 

type Client interface {
	// 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:
	//	- serviceerror.NotFound, if namespace does not exists
	//	- serviceerror.InvalidArgument
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	//
	// WorkflowRun has 3 methods:
	//  - GetWorkflowID() string: which return the started workflow ID
	//  - 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)

	// GetWorkflow retrieves a workflow execution and return a WorkflowRun instance (described above)
	// - 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 2 methods:
	//  - 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.
	// If workflow not found, the Get() will return serviceerror.NotFound.
	// 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.
	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:
	//	- serviceerror.NotFound
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	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
	// - the workflowID parameter is used instead of options.ID. If the latter is present, it must match the workflowID.
	// Note: options.WorkflowIDReusePolicy is default to AllowDuplicate in this API.
	// The errors it can return:
	//  - serviceerror.NotFound, if namespace does not exist
	//  - serviceerror.InvalidArgument
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	SignalWithStartWorkflow(ctx context.Context, workflowID string, signalName string, signalArg interface{},
		options StartWorkflowOptions, workflow interface{}, workflowArgs ...interface{}) (WorkflowRun, error)

	// CancelWorkflow request cancellation of a workflow in execution. Cancellation request closes the channel
	// returned by the workflow.Context.Done() of the workflow that is target of the request.
	// - workflow ID of the workflow.
	// - runID can be default(empty string). if empty string then it will pick the currently running execution of that workflow ID.
	// The errors it can return:
	//	- serviceerror.NotFound
	//	- serviceerror.InvalidArgument
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	CancelWorkflow(ctx context.Context, workflowID string, runID string) error

	// TerminateWorkflow terminates a workflow execution. Terminate stops a workflow execution immediately without
	// letting the workflow to perform any cleanup
	// 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:
	//	- serviceerror.NotFound
	//	- serviceerror.InvalidArgument
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	TerminateWorkflow(ctx context.Context, workflowID string, runID string, reason string, details ...interface{}) 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 enumspb.HistoryEventFilterType) HistoryEventIterator

	// CompleteActivity reports activity completed.
	// activity Execute method can return 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 canceled 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, temporal.NewApplicationError("reason", details)
	// The activity can fail with below errors ApplicationError, TimeoutError, CanceledError.
	CompleteActivity(ctx context.Context, taskToken []byte, result interface{}, err error) error

	// CompleteActivityByID reports activity completed.
	// Similar to CompleteActivity, but may save 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 canceled 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.
	// namespace name, workflowID, activityID are required, runID is optional.
	// The errors it can return:
	//  - ApplicationError
	//  - TimeoutError
	//  - CanceledError
	CompleteActivityByID(ctx context.Context, namespace, workflowID, runID, activityID string, result interface{}, err error) error

	// RecordActivityHeartbeat records heartbeat for an activity.
	// taskToken - is the value of the binary "TaskToken" field of the "ActivityInfo" struct retrieved inside the activity.
	// details - is the progress you want to record along with heart beat for this activity.
	// The errors it can return:
	//	- serviceerror.NotFound
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	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:
	//	- serviceerror.NotFound
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	RecordActivityHeartbeatByID(ctx context.Context, namespace, workflowID, runID, activityID string, details ...interface{}) error

	// ListClosedWorkflow gets closed workflow executions based on request filters.
	// Retrieved workflow executions are sorted by close time in descending order.
	// Note: heavy usage of this API may cause huge persistence pressure.
	// The errors it can return:
	//  - serviceerror.InvalidArgument
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	//  - serviceerror.NotFound
	ListClosedWorkflow(ctx context.Context, request *workflowservice.ListClosedWorkflowExecutionsRequest) (*workflowservice.ListClosedWorkflowExecutionsResponse, error)

	// ListOpenWorkflow gets open workflow executions based on request filters.
	// Retrieved workflow executions are sorted by start time in descending order.
	// Note: heavy usage of this API may cause huge persistence pressure.
	// The errors it can return:
	//  - serviceerror.InvalidArgument
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	//  - serviceerror.NotFound
	ListOpenWorkflow(ctx context.Context, request *workflowservice.ListOpenWorkflowExecutionsRequest) (*workflowservice.ListOpenWorkflowExecutionsResponse, error)

	// ListWorkflow gets workflow executions based on query. This API only works with ElasticSearch,
	// and will return serviceerror.InvalidArgument 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:
	//  - serviceerror.InvalidArgument
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	ListWorkflow(ctx context.Context, request *workflowservice.ListWorkflowExecutionsRequest) (*workflowservice.ListWorkflowExecutionsResponse, error)

	// ListArchivedWorkflow gets archived workflow executions based on query. This API will return BadRequest if Temporal
	// cluster or target namespace is not configured for visibility archival or read is not enabled. The query is basically the SQL WHERE clause.
	// However, different visibility archivers have different limitations on the query. Please check the documentation of the visibility archiver used
	// by your namespace to see what kind of queries are accept and whether retrieved workflow executions are ordered or not.
	// The errors it can return:
	//  - serviceerror.InvalidArgument
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	ListArchivedWorkflow(ctx context.Context, request *workflowservice.ListArchivedWorkflowExecutionsRequest) (*workflowservice.ListArchivedWorkflowExecutionsResponse, error)

	// ScanWorkflow gets workflow executions based on query. This API only works with ElasticSearch,
	// and will return serviceerror.InvalidArgument 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:
	//  - serviceerror.InvalidArgument
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	ScanWorkflow(ctx context.Context, request *workflowservice.ScanWorkflowExecutionsRequest) (*workflowservice.ScanWorkflowExecutionsResponse, error)

	// CountWorkflow gets number of workflow executions based on query. This API only works with ElasticSearch,
	// and will return serviceerror.InvalidArgument when using Cassandra or MySQL. The query is basically the SQL WHERE clause
	// (see ListWorkflow for query examples).
	// The errors it can return:
	//  - serviceerror.InvalidArgument
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	CountWorkflow(ctx context.Context, request *workflowservice.CountWorkflowExecutionsRequest) (*workflowservice.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 temporal server
	// to update dynamic config ValidSearchAttributes.
	GetSearchAttributes(ctx context.Context) (*workflowservice.GetSearchAttributesResponse, error)

	// QueryWorkflow queries a given workflow's last 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, temporal 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:
	//  - serviceerror.InvalidArgument
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	//  - serviceerror.NotFound
	//  - serviceerror.QueryFailed
	QueryWorkflow(ctx context.Context, workflowID string, runID string, queryType string, args ...interface{}) (converter.EncodedValue, error)

	// QueryWorkflowWithOptions queries a given workflow execution and returns the query result synchronously.
	// See QueryWorkflowWithOptionsRequest and QueryWorkflowWithOptionsResponse for more information.
	// The errors it can return:
	//  - serviceerror.InvalidArgument
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	//  - serviceerror.NotFound
	//  - serviceerror.QueryFailed
	QueryWorkflowWithOptions(ctx context.Context, request *QueryWorkflowWithOptionsRequest) (*QueryWorkflowWithOptionsResponse, error)

	// DescribeWorkflowExecution returns information about the specified workflow execution.
	// - runID can be default(empty string). if empty string then it will pick the last running execution of that workflow ID.
	//
	// The errors it can return:
	//  - serviceerror.InvalidArgument
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	//  - serviceerror.NotFound
	DescribeWorkflowExecution(ctx context.Context, workflowID, runID string) (*workflowservice.DescribeWorkflowExecutionResponse, error)

	// DescribeTaskQueue returns information about the target taskqueue, right now this API returns the
	// pollers which polled this taskqueue in last few minutes.
	// The errors it can return:
	//  - serviceerror.InvalidArgument
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	//  - serviceerror.NotFound
	DescribeTaskQueue(ctx context.Context, taskqueue string, taskqueueType enumspb.TaskQueueType) (*workflowservice.DescribeTaskQueueResponse, error)

	// ResetWorkflowExecution reset an existing workflow execution to WorkflowTaskFinishEventId(exclusive).
	// And it will immediately terminating the current execution instance.
	// RequestId is used to deduplicate requests. It will be autogenerated if not set.
	ResetWorkflowExecution(ctx context.Context, request *workflowservice.ResetWorkflowExecutionRequest) (*workflowservice.ResetWorkflowExecutionResponse, error)

	// WorkflowService provides access to the underlying gRPC service. This should only be used for advanced use cases
	// that cannot be accomplished via other Client methods. Unlike calls to other Client methods, calls directly to the
	// service are not configured with internal semantics such as automatic retries.
	WorkflowService() workflowservice.WorkflowServiceClient

	// Close client and clean up underlying resources.
	Close()
}

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

func NewClient 

func NewClient(options Options) (Client, error)

NewClient creates an instance of a workflow client. This will attempt to connect to the server eagerly and will return an error if the server is not available.

type ConnectionOptions 

type ConnectionOptions = internal.ConnectionOptions

ConnectionOptions are optional parameters that can be specified in ClientOptions

type HistoryEventIterator 

type HistoryEventIterator = internal.HistoryEventIterator

HistoryEventIterator is a iterator which can return history events.

type MetricsCounter added in v1.12.0 

type MetricsCounter = metrics.Counter

MetricsCounter is an ever-increasing counter.

type MetricsGauge added in v1.12.0 

type MetricsGauge = metrics.Gauge

MetricsGauge can be set to any float.

type MetricsHandler added in v1.12.0 

type MetricsHandler = metrics.Handler

MetricsHandler is a handler for metrics emitted by the SDK. This interface is intentionally limited to only what the SDK needs to emit metrics and is not built to be a general purpose metrics abstraction for all uses.

A common implementation is at go.temporal.io/sdk/contrib/tally.NewMetricsHandler. The MetricsNopHandler is a noop handler. A handler may implement "Unwrap() client.MetricsHandler" if it wraps a handler.

type MetricsTimer added in v1.12.0 

type MetricsTimer = metrics.Timer

MetricsTimer records time durations.

type NamespaceClient 

type NamespaceClient interface {
	// Register a namespace with temporal server
	// The errors it can throw:
	//	- NamespaceAlreadyExistsError
	//	- serviceerror.InvalidArgument
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	Register(ctx context.Context, request *workflowservice.RegisterNamespaceRequest) error

	// Describe a namespace. The namespace has 3 part of information
	// NamespaceInfo - Which has Name, Status, Description, Owner Email
	// NamespaceConfiguration - 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:
	//	- serviceerror.NotFound
	//	- serviceerror.InvalidArgument
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	Describe(ctx context.Context, name string) (*workflowservice.DescribeNamespaceResponse, error)

	// Update a namespace.
	// The errors it can throw:
	//	- serviceerror.NotFound
	//	- serviceerror.InvalidArgument
	//	- serviceerror.Internal
	//	- serviceerror.Unavailable
	Update(ctx context.Context, request *workflowservice.UpdateNamespaceRequest) error

	// Close client and clean up underlying resources.
	Close()
}

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

func NewNamespaceClient 

func NewNamespaceClient(options Options) (NamespaceClient, error)

NewNamespaceClient creates an instance of a namespace client, to manage lifecycle of namespaces. This will not attempt to connect to the server eagerly and therefore may not fail for an unreachable server until a call is made. grpc.WithBlock can be passed as a gRPC dial option to connection options to eagerly connect.

type Options 

type Options = internal.ClientOptions

Options are optional parameters for Client creation.

type QueryWorkflowWithOptionsRequest 

type QueryWorkflowWithOptionsRequest = internal.QueryWorkflowWithOptionsRequest

QueryWorkflowWithOptionsRequest defines the request to QueryWorkflowWithOptions.

type QueryWorkflowWithOptionsResponse 

type QueryWorkflowWithOptionsResponse = internal.QueryWorkflowWithOptionsResponse

QueryWorkflowWithOptionsResponse defines the response to QueryWorkflowWithOptions.

type StartWorkflowOptions 

type StartWorkflowOptions = internal.StartWorkflowOptions

StartWorkflowOptions configuration parameters for starting a workflow execution.

type WorkflowRun 

type WorkflowRun = internal.WorkflowRun

WorkflowRun represents a started non child workflow.

type WorkflowServiceProxyOptions added in v1.14.0 

type WorkflowServiceProxyOptions struct {
	Client workflowservice.WorkflowServiceClient
}

WorkflowServiceProxyOptions provides options for configuring a WorkflowServiceProxyServer. Client is a WorkflowServiceClient used to forward requests received by the server to the Temporal Frontend.

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