构建步骤

{
  "timeZone": "America/Los_Angeles",
  "exceptionLogging": "STACKDRIVER",
  "runtimeVersion": "V8",
  "addOns": {
    "common": {
      "name": "Calculator",
      "logoUrl": "https://www.gstatic.com/images/branding/productlogos/calculator_search/v1/web-24dp/logo_calculator_search_color_1x_web_24dp.png",
      "useLocaleFromApp": true
    },
    "flows": {
      "workflowElements": [
        {
          "id": "actionElement",
          "state": "ACTIVE",
          "name": "Calculate",
          "description": "Asks the user for two values and a math operation, then performs the math operation on the values and outputs the result.",
          "workflowAction": {
            "inputs": [
              {
                "id": "value1",
                "description": "value1",
                "cardinality": "SINGLE",
                "dataType": {
                  "basicType": "INTEGER"
                }
              },
              {
                "id": "value2",
                "description": "value2",
                "cardinality": "SINGLE",
                "dataType": {
                  "basicType": "INTEGER"
                }
              },
              {
                "id": "operation",
                "description": "operation",
                "cardinality": "SINGLE",
                "dataType": {
                  "basicType": "STRING"
                }
              }
            ],
            "outputs": [
              {
                "id": "result",
                "description": "Calculated result",
                "cardinality": "SINGLE",
                "dataType": {
                  "basicType": "INTEGER"
                }
              }
            ],
            "onConfigFunction": "onConfigCalculate",
            "onExecuteFunction": "onExecuteCalculate"
          }
        }
      ]
    }
  }
}

/**
 * Generates and displays a configuration card for the sample calculation step.
 *
 * This function creates a card with input fields for two values and a drop-down
 * for selecting an arithmetic operation. The card also includes a "Save"
 * button to save the step configuration for the workflow.
 *
 * The input fields are configured to let the user select outputs from previous
 * workflow steps as input values using the `hostAppDataSource` property.
 */
function onConfigCalculate() {
  var card = {
    "sections": [
      {
        "header": "Step example: Calculate",
        "widgets": [
          {
            "textInput": {
              "name": "value1",
              "label": "First value",
              "hostAppDataSource" : {
                "workflowDataSource" : {
                  "includeVariables" : true
                }
              }
            }
          },
          {
            "selectionInput": {
              "name": "operation",
              "label": "Operation",
              "type": "DROPDOWN",
              "items": [
                {
                  "text": "+",
                  "value": "+",
                },
                {
                  "text": "-",
                  "value": "-",
                },
                {
                  "text": "x",
                  "value": "x",
                },
                {
                  "text": "/",
                  "value": "/",
                }
              ]
            }
          },
          {
            "textInput": {
              "name": "value2",
              "label": "Second value",
              "hostAppDataSource" : {
                "workflowDataSource" : {
                  "includeVariables" : true
                }
              }
            }
          }
        ]
      }
    ]
  };
  return {
    "action": {
      "navigations": [{
        "push_card": card
      }]
    }
  };
}

/**
 * Returns output variables from a step.
 *
 * This function constructs an object that, when returned, sends the
 * provided variable values as output from the current step.
 * The variable values are logged to the console for debugging purposes.
 */
function outputVariables(variableValues) {
  var renderAction =  {
    "hostAppAction" : {
      "workflowAction" : {
        "returnOutputVariablesAction" : {
          "variables" : variableValues
        }
      }
    }
  };
  console.log("renderAction: " + JSON.stringify(renderAction));
  return renderAction;
}

/**
 * Executes the calculation step based on the inputs from a flow event.
 *
 * This function retrieves input values and the operation from the flow event,
 * performs the calculation, and returns the result as an output variable.
 * The function logs the event for debugging purposes.
 */
function onExecuteCalculate(event) {
  console.log("output: " + JSON.stringify(event));
  var calculatedValue = 0;
  var value1 = event.workflow.actionInvocation.inputs["value1"].integerValues[0];
  var value2 = event.workflow.actionInvocation.inputs["value2"].integerValues[0];
  var operation = event.workflow.actionInvocation.inputs["operation"].stringValues[0];

  if (operation == "+") {
    calculatedValue = value1 + value2;
  } else if (operation == "-") {
    calculatedValue = value1 - value2;
  } else if (operation == "x") {
    calculatedValue = value1 * value2;
  } else if (operation == "/") {
    calculatedValue = value1 / value2;
  }
  return outputVariables([{
    "variableId": "result",
    "variableData": {
        "integerValues": [
          calculatedValue
        ]
      },
  }]);
}