使用 Google Cloud 控制台创建工作流

本快速入门介绍了如何使用 Google Cloud 控制台创建、部署和执行第一个工作流。示例工作流会向公共 API 发送请求，然后返回该 API 的响应。

如需在 Google Cloud 控制台中直接遵循有关此任务的分步指导，请点击操作演示：

操作演示

准备工作

您的组织定义的安全限制条件可能会导致您无法完成以下步骤。如需了解相关问题排查信息，请参阅在受限的 Google Cloud 环境中开发应用。

  1. Sign in to your Google Cloud account. If you're new to Google Cloud, create an account to evaluate how our products perform in real-world scenarios. New customers also get $300 in free credits to run, test, and deploy workloads.

  2. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

    Roles required to select or create a project

    • Select a project: Selecting a project doesn't require a specific IAM role—you can select any project that you've been granted a role on.
    • Create a project: To create a project, you need the Project Creator role (roles/resourcemanager.projectCreator), which contains the resourcemanager.projects.create permission. Learn how to grant roles.

    Go to project selector

  3. 如果您要使用现有项目来完成本指南，请验证您是否拥有完成本指南所需的权限。如果您创建了新项目，则您已拥有所需的权限。

  4. Verify that billing is enabled for your Google Cloud project.

  5. Enable the Workflows API.

    Roles required to enable APIs

    To enable APIs, you need the Service Usage Admin IAM role (roles/serviceusage.serviceUsageAdmin), which contains the serviceusage.services.enable permission. Learn how to grant roles.

    Enable the API

  6. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

    Roles required to select or create a project

    • Select a project: Selecting a project doesn't require a specific IAM role—you can select any project that you've been granted a role on.
    • Create a project: To create a project, you need the Project Creator role (roles/resourcemanager.projectCreator), which contains the resourcemanager.projects.create permission. Learn how to grant roles.

    Go to project selector

  7. 如果您要使用现有项目来完成本指南，请验证您是否拥有完成本指南所需的权限。如果您创建了新项目，则您已拥有所需的权限。

  8. Verify that billing is enabled for your Google Cloud project.

  9. Enable the Workflows API.

    Roles required to enable APIs

    To enable APIs, you need the Service Usage Admin IAM role (roles/serviceusage.serviceUsageAdmin), which contains the serviceusage.services.enable permission. Learn how to grant roles.

    Enable the API

    10.
  10. 设置身份验证：
    1. Ensure that you have the Create Service Accounts IAM role (roles/iam.serviceAccountCreator) and the Project IAM Admin role (roles/resourcemanager.projectIamAdmin). Learn how to grant roles.

    2. In the Google Cloud console, go to the Create service account page.

      Go to Create service account
    3. Select your project.

    4. In the Service account name field, enter a name. The Google Cloud console fills in the Service account ID field based on this name.

      In the Service account description field, enter a description. For example, Service account for quickstart.

    5. Click Create and continue.

    6. Grant the Logging > Logs Writer role to the service account.

      To grant the role, find the Select a role list, then select Logging > Logs Writer.

    7. Click Continue.

    8. Click Done to finish creating the service account.

    11. 如需详细了解服务账号角色和权限，请参阅授予工作流访问 Google Cloud 资源的权限。

所需的角色

如需获得完成本快速入门所需的权限，请让您的管理员为您授予项目的以下 IAM 角色：

如需详细了解如何授予角色，请参阅管理对项目、文件夹和组织的访问权限。

您也可以通过自定义角色或其他预定义角色来获取所需的权限。

创建和部署工作流

  1. 在 Google Cloud 控制台中，前往 Workflows 页面：

    进入 Workflows

  2. 在工作流页面上，点击 创建。

  3. 输入新工作流的名称，例如 myFirstWorkflow。

  4. 选择 us-central1 作为区域。

  5. 对于服务账号，选择您之前创建的服务账号。

  6. 选择下一步。

  7. 在工作流编辑器中，复制并粘贴以下工作流：

    YAML

    main:
  params: [input]
  steps:
    - checkSearchTermInInput:
        switch:
          - condition: '${"searchTerm" in input}'
            assign:
              - searchTerm: '${input.searchTerm}'
            next: readWikipedia
    - getLocation:
        call: sys.get_env
        args:
          name: GOOGLE_CLOUD_LOCATION
        result: location
    - setFromCallResult:
        assign:
          - searchTerm: '${text.split(location, "-")[0]}'
    - readWikipedia:
        call: http.get
        args:
          url: 'https://en.wikipedia.org/w/api.php'
          query:
            action: opensearch
            search: '${searchTerm}'
        result: wikiResult
    - returnOutput:
        return: '${wikiResult.body[1]}'

    JSON

    {
  "main": {
    "params": [
      "input"
    ],
    "steps": [
      {
        "checkSearchTermInInput": {
          "switch": [
            {
              "condition": "${\"searchTerm\" in input}",
              "assign": [
                {
                  "searchTerm": "${input.searchTerm}"
                }
              ],
              "next": "readWikipedia"
            }
          ]
        }
      },
      {
        "getLocation": {
          "call": "sys.get_env",
          "args": {
            "name": "GOOGLE_CLOUD_LOCATION"
          },
          "result": "location"
        }
      },
      {
        "setFromCallResult": {
          "assign": [
            {
              "searchTerm": "${text.split(location, \"-\")[0]}"
            }
          ]
        }
      },
      {
        "readWikipedia": {
          "call": "http.get",
          "args": {
            "url": "https://en.wikipedia.org/w/api.php",
            "query": {
              "action": "opensearch",
              "search": "${searchTerm}"
            }
          },
          "result": "wikiResult"
        }
      },
      {
        "returnOutput": {
          "return": "${wikiResult.body[1]}"
        }
      }
    ]
  }
}

    除非您输入自己的搜索字词，否则此工作流会使用您的Google Cloud 位置构造搜索字词，并将其传递给 Wikipedia API。系统会返回相关 Wikipedia 文章的列表。

  8. 选择部署。

执行工作流

工作流成功部署后，您可以首次执行该工作流。部署工作流后，您将转到其工作流详情页面。

  1. 在工作流详情页面上，点击 执行。

  2. 在执行工作流页面上，点击执行。

  3. 在输出窗格中，系统会显示工作流的结果。

您已部署并执行了第一个工作流程！

清理

为避免因本页中使用的资源导致您的 Google Cloud 账号产生费用，请按照以下步骤操作。

  1. 在 Google Cloud 控制台中，前往 Workflows 页面：

    进入 Workflows

  2. 从工作流列表中，点击工作流以转至其工作流详情页面。

  3. 点击 删除。

  4. 输入工作流的名称，然后点击确认。

后续步骤