如何在 argo 工作流程中的地图中传递多行 json 字符串答案

【问题标题】：how to pass a multi line json string in map in argo workflows如何在 argo 工作流程中的地图中传递多行 json 字符串
【发布时间】：2022-01-04 16:03:04
【问题描述】：

我正在创建一个带有循环 withParam 用于映射变量的 argo 工作流。在这张地图中，我想使用多行 json 字符串。有什么方法可以使用吗？

这是使用policy 作为多行字符串的方式，但它不起作用

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: loops-param-arg-
spec:
  entrypoint: loop-param-arg-example
  arguments:
    parameters:
    - name: os-list
      value: |
        [
          { "image": "debian", "tag": "9.1", "policy": "{
              "Version": "2012-10-17",
              "Statement": [
                  {
                      "Sid": "BucketAdmin",
                      "Effect": "Allow",
                      "Principal": "*",
                      "Action": "s3:*",
                      "Resource": "*"
                  }
              ]
          }" },
          { "image": "ubuntu", "tag": "17.10", "policy":  "{
              "Version": "2012-10-17",
              "Statement": [
                  {
                      "Sid": "BucketAdmin",
                      "Effect": "Allow",
                      "Principal": "*",
                      "Action": "s3:*",
                      "Resource": "*"
                  }
              ]
          }"}
        ]
  templates:
  - name: loop-param-arg-example
    inputs:
      parameters:
      - name: os-list
    steps:
    - - name: test-linux
        template: cat-os-release
        arguments:
          parameters:
          - name: image
            value: "{{item.image}}"
          - name: tag
            value: "{{item.tag}}"
        withParam: "{{inputs.parameters.os-list}}"

  - name: cat-os-release
    inputs:
      parameters:
      - name: image
      - name: tag
    container:
      image: "{{inputs.parameters.image}}:{{inputs.parameters.tag}} and policy is {{inputs.parameters.policy}}"
      command: [cat]
      args: [/etc/os-release]

在 argo 工作流程中有什么方法可以实现这一点吗？如果没有，有什么替代方法可以做到这一点？

【问题讨论】：

标签： json loops multilinestring argo-workflows argo

【解决方案1】：

存在三个问题：

策略不是有效的 JSON。星号必须加引号，因为它们是字符串。

  {
    "Sid": "BucketAdmin",
    "Effect": "Allow",
-   "Principal": *,
+   "Principal": "*",
    "Action": "s3:*",
-   "Resource": *
+   "Resource": "*"
  }

（更新：实际上不需要此更改 - Argo Workflows 正确处理 policy JSON 对象。）策略应编码为字符串，以便可以轻松地作为参数传递。例如：
```
"{\"Version\":\"2012-10-17\",\"Statement\":[{\"Sid\":\"BucketAdmin\",\"Effect\":\"Allow\",\"Principal\":\"*\",\"Action\":\"s3:*\",\"Resource\":\"*\"}]}"
```
策略值需要作为参数显式传递给 cat-os-release 模板。

最终的工作流程应如下所示：

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: loops-param-arg-
spec:
  entrypoint: loop-param-arg-example
  arguments:
    parameters:
      - name: os-list
        value: |
          [
            {
              "image": "debian",
              "tag": "9.1",
              "policy": "{\"Version\":\"2012-10-17\",\"Statement\":[{\"Sid\":\"BucketAdmin\",\"Effect\":\"Allow\",\"Principal\":\"*\",\"Action\":\"s3:*\",\"Resource\":\"*\"}]}"
            },
            {
              "image": "ubuntu",
              "tag": "17.10",
              "policy": "{\"Version\":\"2012-10-17\",\"Statement\":[{\"Sid\":\"BucketAdmin\",\"Effect\":\"Allow\",\"Principal\":\"*\",\"Action\":\"s3:*\",\"Resource\":\"*\"}]}"
            }
          ]
  templates:
    - name: loop-param-arg-example
      inputs:
        parameters:
          - name: os-list
      steps:
        - - name: test-linux
            template: cat-os-release
            arguments:
              parameters:
                - name: image
                  value: "{{item.image}}"
                - name: tag
                  value: "{{item.tag}}"
                - name: policy
                  value: "{{item.policy}}"
            withParam: "{{inputs.parameters.os-list}}"

    - name: cat-os-release
      inputs:
        parameters:
          - name: image
          - name: tag
          - name: policy
      container:
        image: "{{inputs.parameters.image}}:{{inputs.parameters.tag}}"
        command: [echo]
        args: ["{{inputs.parameters.policy}}"]

【讨论】：

感谢@michael crenshaw 的回答，它正在工作。但是我有很大的政策，如果我为政策中的每条指令添加转义字符，我们就会失去政策的可读性。
我已对问题进行了更改。为星号添加双引号
@monu 很有趣，不知道你可以有一个非字符串item.something 成员。将更新我的答案！

【解决方案2】：

Michael 提供的解决方案有效，以下解决方案也适用于您，并具有一定的政策可读性

kind: Workflow
metadata:
  generateName: loops-param-arg-
spec:
  entrypoint: loop-param-arg-example
  arguments:
    parameters:
    - name: os-list
      value: |
        [
          { "image": "debian", "tag": "9.1", "policy": {
                                                          "Version": "2012-10-17",
                                                          "Statement": [
                                                              {
                                                                  "Sid": "BucketAdmin",
                                                                  "Effect": "Allow",
                                                                  "Principal": "*",
                                                                  "Action": "s3:*",
                                                                  "Resource": "*"
                                                              }
                                                          ]
                                                      } },
          { "image": "ubuntu", "tag": "17.10", "policy":  {
                                                            "Version": "2012-10-17",
                                                            "Statement": [
                                                                {
                                                                    "Sid": "BucketAdmin",
                                                                    "Effect": "Allow",
                                                                    "Principal": "*",
                                                                    "Action": "s3:*",
                                                                    "Resource": "*"
                                                                }
                                                            ]
                                                        }
          }
        ]
  templates:
  - name: loop-param-arg-example
    inputs:
      parameters:
      - name: os-list
    steps:
    - - name: test-linux
        template: cat-os-release
        arguments:
          parameters:
          - name: image
            value: "{{item.image}}"
          - name: tag
            value: "{{item.tag}}"
        withParam: "{{inputs.parameters.os-list}}"

  - name: cat-os-release
    inputs:
      parameters:
      - name: image
      - name: tag
    container:
      image: "{{inputs.parameters.image}}:{{inputs.parameters.tag}} and policy is {{inputs.parameters.policy}}"
      command: [cat]
      args: [/etc/os-release]

【讨论】：