Workflow host operations.

75type FunctionOptions struct{ DatasetTransaction string }76 77func Function(name string, input Value, options ...FunctionOptions) (Value, error) {78	if len(options) > 1 {79		return Value{}, errors.New("Function accepts at most one options value")80	}81	args := map[string]Value{"input": input}82	if len(options) == 1 && options[0].DatasetTransaction != "" {83		args["dataset_transaction"] = String(options[0].DatasetTransaction)84	}85	return WorkflowCall("function", name, MustObject(args))86}87func Action(name string, input Value, target, candidateReceiptID *string) (Value, error) {88	targetValue, candidateValue := Null(), Null()89	if target != nil {90		targetValue = String(*target)91	}92	if candidateReceiptID != nil {93		candidateValue = String(*candidateReceiptID)94	}95	return WorkflowCall("action", name, MustObject(map[string]Value{96		"input": input, "target": targetValue, "candidate_receipt_id": candidateValue,97	}))98}99func StartWorkflow(name string, input Value) (Value, error) {100	return WorkflowCall("start_workflow", name, MustObject(map[string]Value{"input": input}))101}102func GetResult(runID string) (Value, error) {103	return WorkflowCall("get_result", "", MustObject(map[string]Value{"run_id": String(runID)}))104}105 106// CancelChild stops one child Workflow this Run started. A structured child's107// lifetime belongs to its parent, which also stops every outstanding child when108// it settles; already committed child Actions are never compensated.