Update-with-Start operation (#1579)

Adds support for Update-with-Start, using the MultiOperation API (temporalio/api#367).

.github/workflows/docker/dynamic-config-custom.yaml

@@ -7,6 +7,8 @@ frontend.enableUpdateWorkflowExecution:
   - value: true
 frontend.enableUpdateWorkflowExecutionAsyncAccepted:
   - value: true
+frontend.enableExecuteMultiOperation:
+  - value: true
 system.enableEagerWorkflowStart:
   - value: true
 frontend.workerVersioningRuleAPIs:

client/client.go

@@ -162,6 +162,16 @@ type (
 	// StartWorkflowOptions configuration parameters for starting a workflow execution.
 	StartWorkflowOptions = internal.StartWorkflowOptions
 
+	// WithStartWorkflowOperation is a type of operation that can be executed as part of a workflow start.
+	// For example, use NewUpdateWithStartWorkflowOperation to perform Update-with-Start.
+	// NOTE: Experimental
+	WithStartWorkflowOperation = internal.WithStartWorkflowOperation
+
+	// UpdateWithStartWorkflowOperation is used to perform Update-with-Start.
+	// See NewUpdateWithStartWorkflowOperation for details.
+	// NOTE: Experimental
+	UpdateWithStartWorkflowOperation = internal.UpdateWithStartWorkflowOperation
+
 	// HistoryEventIterator is a iterator which can return history events.
 	HistoryEventIterator = internal.HistoryEventIterator
 
@@ -921,6 +931,14 @@ type MetricsTimer = metrics.Timer
 // MetricsNopHandler is a noop handler that does nothing with the metrics.
 var MetricsNopHandler = metrics.NopHandler
 
+// NewUpdateWithStartWorkflowOperation returns an UpdateWithStartWorkflowOperation to perform Update-with-Start.
+// After executing Client.ExecuteWorkflow with the UpdateWithStartWorkflow in the start options,
+// the update result can be obtained.
+// NOTE: Experimental
+func NewUpdateWithStartWorkflowOperation(options UpdateWorkflowOptions) *UpdateWithStartWorkflowOperation {
+	return internal.NewUpdateWithStartWorkflowOperation(options)
+}
+
 // Dial 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.

internal/client.go

@@ -27,6 +27,7 @@ package internal
 import (
 	"context"
 	"crypto/tls"
+	"errors"
 	"fmt"
 	"sync/atomic"
 	"time"
@@ -643,9 +644,23 @@ type (
 		// Optional: defaulted to Fail.
 		WorkflowIDConflictPolicy enumspb.WorkflowIdConflictPolicy
 
+		// WithStartOperation - Operation to execute with Workflow Start.
+		// For example, see NewUpdateWithStartWorkflowOperation to perform Update-with-Start. Note that if the workflow is
+		// already running and WorkflowIDConflictPolicy is set to UseExisting, the start is skipped and only the
+		// operation is executed. If instead the policy is set to Fail (the default), nothing is executed and
+		// an error will be returned (i.e. the option WorkflowExecutionErrorWhenAlreadyStarted is ignored).
+		// This option will be ignored when used with Client.SignalWithStartWorkflow.
+		//
+		// Optional: defaults to nil.
+		//
+		// NOTE: Experimental
+		WithStartOperation WithStartWorkflowOperation
+
 		// When WorkflowExecutionErrorWhenAlreadyStarted is true, Client.ExecuteWorkflow will return an error if the
-		// workflow id has already been used and WorkflowIDReusePolicy would disallow a re-run. If it is set to false,
-		// rather than erroring a WorkflowRun instance representing the current or last run will be returned.
+		// workflow id has already been used and WorkflowIDReusePolicy or WorkflowIDConflictPolicy would
+		// disallow a re-run. If it is set to false, rather than erroring a WorkflowRun instance representing
+		// the current or last run will be returned. However, when WithStartOperation is set, this field is ignored and
+		// the WorkflowIDConflictPolicy UseExisting must be used instead to prevent erroring.
 		//
 		// Optional: defaults to false
 		WorkflowExecutionErrorWhenAlreadyStarted bool
@@ -714,6 +729,24 @@ type (
 		links     []*commonpb.Link
 	}
 
+	// WithStartWorkflowOperation is a type of operation that can be executed as part of a workflow start.
+	WithStartWorkflowOperation interface {
+		isWithStartWorkflowOperation()
+	}
+
+	// UpdateWithStartWorkflowOperation is used to perform Update-with-Start.
+	// See NewUpdateWithStartWorkflowOperation for details.
+	UpdateWithStartWorkflowOperation struct {
+		input *ClientUpdateWorkflowInput
+		// flag to ensure the operation is only executed once
+		executed atomic.Bool
+		// channel to indicate that handle or err is available
+		doneCh chan struct{}
+		// handle and err cannot be accessed before doneCh is closed
+		handle WorkflowUpdateHandle
+		err    error
+	}
+
 	// 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
@@ -1004,6 +1037,50 @@ func DialCloudOperationsClient(ctx context.Context, options CloudOperationsClien
 	}, nil
 }
 
+// NewUpdateWithStartWorkflowOperation returns an UpdateWithStartWorkflowOperation that can be used to perform Update-with-Start.
+func NewUpdateWithStartWorkflowOperation(options UpdateWorkflowOptions) *UpdateWithStartWorkflowOperation {
+	res := &UpdateWithStartWorkflowOperation{doneCh: make(chan struct{})}
+
+	input, err := createUpdateWorkflowInput(options)
+	if err != nil {
+		res.set(nil, err)
+	} else if options.RunID != "" {
+		res.set(nil, errors.New("RunID cannot be set because the workflow might not be running"))
+	}
+	if options.FirstExecutionRunID != "" {
+		res.set(nil, errors.New("FirstExecutionRunID cannot be set because the workflow might not be running"))
+	} else {
+		res.input = input
+	}
+
+	return res
+}
+
+// Get blocks until a server response has been received; or the context deadline is exceeded.
+func (op *UpdateWithStartWorkflowOperation) Get(ctx context.Context) (WorkflowUpdateHandle, error) {
+	select {
+	case <-op.doneCh:
+		return op.handle, op.err
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	}
+}
+
+func (op *UpdateWithStartWorkflowOperation) markExecuted() error {
+	if op.executed.Swap(true) {
+		return fmt.Errorf("was already executed")
+	}
+	return nil
+}
+
+func (op *UpdateWithStartWorkflowOperation) set(handle WorkflowUpdateHandle, err error) {
+	op.handle = handle
+	op.err = err
+	close(op.doneCh)
+}
+
+func (op *UpdateWithStartWorkflowOperation) isWithStartWorkflowOperation() {}
+
 // NewNamespaceClient creates an instance of a namespace client, to manager lifecycle of namespaces.
 func NewNamespaceClient(options ClientOptions) (NamespaceClient, error) {
 	// Initialize root tags

internal/cmd/build/main.go

@@ -41,9 +41,10 @@ import (
 
 	_ "github.com/BurntSushi/toml"
 	_ "github.com/kisielk/errcheck/errcheck"
+	_ "honnef.co/go/tools/staticcheck"
+
 	"go.temporal.io/sdk/client"
 	"go.temporal.io/sdk/testsuite"
-	_ "honnef.co/go/tools/staticcheck"
 )
 
 func main() {
@@ -145,6 +146,7 @@ func (b *builder) integrationTest() error {
 			},
 			LogLevel: "warn",
 			ExtraArgs: []string{
+				"--dynamic-config-value", "frontend.enableExecuteMultiOperation=true",
 				"--dynamic-config-value", "frontend.enableUpdateWorkflowExecution=true",
 				"--dynamic-config-value", "frontend.enableUpdateWorkflowExecutionAsyncAccepted=true",
 				"--dynamic-config-value", "frontend.workerVersioningRuleAPIs=true",