/
client.go
467 lines (419 loc) · 23.2 KB
/
client.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package internal
import (
"context"
"fmt"
"time"
"go.uber.org/cadence/encoded"
"github.com/uber-go/tally"
"go.uber.org/cadence/.gen/go/cadence/workflowserviceclient"
s "go.uber.org/cadence/.gen/go/shared"
"go.uber.org/cadence/internal/common/metrics"
)
// 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.
const QueryTypeStackTrace string = "__stack_trace"
type (
// Client is the client for starting and getting information about a workflow executions as well as
// completing activities asynchronously.
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
// - 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.
//
// 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)
// 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)
// 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{}) (encoded.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)
}
// ClientOptions are optional parameters for Client creation.
ClientOptions struct {
MetricsScope tally.Scope
Identity string
DataConverter encoded.DataConverter
}
// 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.
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 time out for duration of workflow execution.
// The resolution is seconds.
// Mandatory: No default.
ExecutionStartToCloseTimeout time.Duration
// DecisionTaskStartToCloseTimeout - The time out 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 info that will be showed in list workflow.
Memo map[string]interface{}
}
// RetryPolicy defines the retry policy
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
}
// DomainClient is the client for managing operations on the domain.
// CLI, tools, ... can use this layer to manager operations on domain.
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
}
// WorkflowIDReusePolicy defines workflow ID reuse behavior.
WorkflowIDReusePolicy int
)
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
)
// NewClient creates an instance of a workflow client
func NewClient(service workflowserviceclient.Interface, domain string, options *ClientOptions) Client {
var identity string
if options == nil || options.Identity == "" {
identity = getWorkerIdentity("")
} else {
identity = options.Identity
}
var metricScope tally.Scope
if options != nil {
metricScope = options.MetricsScope
}
metricScope = tagScope(metricScope, tagDomain, domain, clientImplHeaderName, clientImplHeaderValue)
var dataConverter encoded.DataConverter
if options != nil && options.DataConverter != nil {
dataConverter = options.DataConverter
} else {
dataConverter = getDefaultDataConverter()
}
return &workflowClient{
workflowService: metrics.NewWorkflowServiceWrapper(service, metricScope),
domain: domain,
metricsScope: metrics.NewTaggedScope(metricScope),
identity: identity,
dataConverter: dataConverter,
}
}
// NewDomainClient creates an instance of a domain client, to manager lifecycle of domains.
func NewDomainClient(service workflowserviceclient.Interface, options *ClientOptions) DomainClient {
var identity string
if options == nil || options.Identity == "" {
identity = getWorkerIdentity("")
} else {
identity = options.Identity
}
var metricScope tally.Scope
if options != nil {
metricScope = options.MetricsScope
}
metricScope = tagScope(metricScope, tagDomain, "domain-client", clientImplHeaderName, clientImplHeaderValue)
return &domainClient{
workflowService: metrics.NewWorkflowServiceWrapper(service, metricScope),
metricsScope: metricScope,
identity: identity,
}
}
func (p WorkflowIDReusePolicy) toThriftPtr() *s.WorkflowIdReusePolicy {
var policy s.WorkflowIdReusePolicy
switch p {
case WorkflowIDReusePolicyAllowDuplicate:
policy = s.WorkflowIdReusePolicyAllowDuplicate
case WorkflowIDReusePolicyAllowDuplicateFailedOnly:
policy = s.WorkflowIdReusePolicyAllowDuplicateFailedOnly
case WorkflowIDReusePolicyRejectDuplicate:
policy = s.WorkflowIdReusePolicyRejectDuplicate
default:
panic(fmt.Sprintf("unknown workflow reuse policy %v", p))
}
return &policy
}
// 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 NewValue(data []byte) encoded.Value {
return newEncodedValue(data, nil)
}
// 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)
func NewValues(data []byte) encoded.Values {
return newEncodedValues(data, nil)
}