我有两个工作流程模板generate-output, lib-read-outputs和一个工作流程output-paramter如下

1. generate-output.yaml

apiVersion: argoproj.io/v1alpha1
kind: WorkflowTemplate
metadata:
  name: generate-output
spec:
  entrypoint: main
  templates:
    - name: main
      dag:
        tasks:

          # Generate Json for Outputs
          - name: read-outputs
            arguments:
              parameters:
                - name: outdata
                  value: |
                    {
                      "version": 4,
                      "terraform_version": "0.14.11",
                      "serial": 0,
                      "lineage": "732322df-5bd43-6e92-8f46-56c0dddwe83cb4",
                      "outputs": {
                        "key_alias_arn": {
                          "value": "arn:aws:kms:us-west-2:123456789:alias/tetsing-key",
                          "type": "string",
                          "sensitive": true
                        },
                        "key_arn": {
                          "value": "arn:aws:kms:us-west-2:123456789:alias/tetsing-key",
                          "type": "string",
                          "sensitive": true
                        }
                      }
                    }
            template: retrieve-outputs

    # Create Json
    - name: retrieve-outputs
      inputs:
        parameters:
          - name: outdata
      script:
        image: python
        command: [python]
        env:
          - name: OUTDATA
            value: "{{inputs.parameters.outdata}}"
        source: |
          import json
          import os
          OUTDATA = json.loads(os.environ["OUTDATA"])
          with open('/tmp/templates_lst.json', 'w') as outfile:
            outfile.write(str(json.dumps(OUTDATA['outputs'])))
        volumeMounts:
          - name: out
            mountPath: /tmp
      volumes:
        - name: out
          emptyDir: { }
      outputs:
        parameters:
          - name: message
            valueFrom:
              path: /tmp/templates_lst.json

2. lib-read-outputs.yaml

apiVersion: argoproj.io/v1alpha1
kind: WorkflowTemplate
metadata:
  name: lib-read-outputs
spec:
  entrypoint: main
  templates:
    - name: main
      dag:
        tasks:
          # Read Outputs
          - name: lib-wft
            templateRef:
              name: generate-output
              template: main

3. output-paramter.yaml

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: output-paramter-
spec:
  entrypoint: main
  templates:
    - name: main
      dag:
        tasks:
          # Json Output data task1
          - name: wf
            templateRef:
              name: lib-read-outputs
              template: main

          - name: lib-wf2
            dependencies: [wf]
            arguments:
              parameters:
                - name: outputResult
                  value: "{{tasks.wf.outputs.parameters.message}}"
            template: whalesay

    - name: whalesay
      inputs:
        parameters:
          - name: outputResult
      container:
        image: docker/whalesay:latest
        command: [cowsay]
        args: ["{{inputs.parameters.outputResult}}"]

我正在尝试传递在workflowTemplate中生成的输出参数generate-output到工作流程output-paramter via lib-read-outputs

当我执行它们时，出现以下错误 -Failed: invalid spec: templates.main.tasks.lib-wf2 failed to resolve {{tasks.wf.outputs.parameters.message}}

默认情况下，DAG 和步骤模板不生成输出

即使只有一个子模板，DAG 和步骤模板也不会自动生成其子模板的输出。

例如，no-parameters这里的模板不会产生输出，即使它调用了一个模板does有一个输出。

apiVersion: argoproj.io/v1alpha1
kind: WorkflowTemplate
spec:
  templates:
  - name: no-parameters
    dag:
      tasks:
      - name: get-a-parameter
        template: get-a-parameter

如果您考虑具有多个任务的 DAG 模板，那么缺少输出是有道理的：

apiVersion: argoproj.io/v1alpha1
kind: WorkflowTemplate
spec:
  templates:
  - name: no-parameters
    dag:
      tasks:
      - name: get-a-parameter
        template: get-a-parameter
      - name: get-another-parameter
        depends: get-a-parameter
        template: get-another-parameter

哪个任务的输出应该no-parameters生产？由于尚不清楚，DAG 和步骤模板默认情况下不会生成输出。

您可以将模板视为函数。您不会期望函数隐式返回其调用的函数的输出。

def get_a_string():
    return "Hello, world!"

def call_get_a_string():
    get_a_string()

print(call_get_a_string())  # This prints nothing.

但 DAG 或步骤模板可以forward outputs

您可以制作 DAG 或步骤模板forward通过设置其输出outputs field.

apiVersion: argoproj.io/v1alpha1
kind: WorkflowTemplate
metadata:
  name: get-parameters-wftmpl
spec:
  templates:
  - name: get-parameters
    dag:
      tasks:
      - name: get-a-parameter
        template: get-a-parameter
      - name: get-another-parameter
        depends: get-a-parameter
        template: get-another-parameter
    # This is the critical part!
    outputs:
      parameters:
      - name: parameter-1
        valueFrom: 
          expression: "tasks['get-a-parameter'].outputs.parameters['parameter-name']"
      - name: parameter-2
        valueFrom: 
          expression: "tasks['get-another-parameter'].outputs.parameters['parameter-name']"
---
apiVersion: argoproj.io/v1alpha1
kind: Workflow
spec:
  templates:
  - name: print-parameter
    dag:
      tasks:
      - name: get-parameters
        templateRef:
          name: get-parameters-wftmpl
          template: get-parameters 
      - name: print-parameter
        depends: get-parameters
        template: print-parameter
        arguments:
          parameters:
          - name: parameter
            value: "{{tasks.get-parameters.outputs.parameters.parameter-1}}"

继续Python的类比：

def get_a_string():
    return "Hello, world!"

def call_get_a_string():
    return get_a_string()  # Add 'return'.

print(call_get_a_string())  # This prints "Hello, world!".

所以，根据你的具体情况...

1. Add an outputs部分到main模板在generate-parameterWorkflowTemplate 转发输出参数retrieve-parameters模板。

   apiVersion: argoproj.io/v1alpha1
   kind: WorkflowTemplate
   metadata:
     name: generate-parameter
   spec:
     entrypoint: main
     templates:
       - name: main
         outputs:
           parameters:
             - name: message
               valueFrom: 
                 expression: "tasks['read-parameters'].outputs.parameters.message"
         dag:
           tasks:
             # ... the rest of the file ...
   
   

2. Add an outputs部分到main模板在lib-read-parameters要转发的工作流程模板generate-parameter的参数。

   apiVersion: argoproj.io/v1alpha1
   kind: WorkflowTemplate
   metadata:
     name: lib-read-parameters
   spec:
     entrypoint: main
     templates:
       - name: main
         outputs:
           parameters:
             - name: message
               valueFrom:
                 expression: "tasks['lib-wft'].outputs.parameters.message"
         dag:
           tasks:
             # ... the rest of the file ...