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[Argo-Workflows] Lesson18: Recursion

Posted on April 11, 2023February 27, 2024 By nim No Comments on [Argo-Workflows] Lesson18: Recursion

Bài này chúng ta lab về vấn dể đệ quy trong workflow.

Nó kiểu như là chúng ta đang chờ thư của bạn gái. một lần cần nhòm vào hộp thư xem có ai gửi cho mình hông?

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: wf-recursion-
spec:
  entrypoint: dag-template
  templates: 
  - name: dag-template
    dag:
      tasks:
      - name: roll-dice
        template: task-roll-dice
      - name: six
        template: task-six
        depends: roll-dice.Succeeded
        when: "{{tasks.roll-dice.outputs.result}} == 6"
      - name: not-six
        template: dag-template
        depends: roll-dice.Succeeded
        when: "{{tasks.roll-dice.outputs.result}} != 6"
  - name: task-roll-dice
    script:
      image: python:3.8-slim
      command: [python]
      source: |
        import random
        number = random.randint(1,6)
        print(number)
  - name: task-six
    script:
      image: python:3.8-slim
      command: [python]
      source: |
        print("Hurra... a 6.")

Bài trên là nếu task roll-dice không trả về số 6 thì task not-six sẽ chạy lại task roll-dice

Bạn sẽ thấy nó chỉ dừng khi số 6 hiện ta

Ở đây mình thêm 1 ví dụ là mình curl vào 1 trang web và parse JSON. Tiếp đến nếu result ok thì mình đi tiếp:

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: wf-recursion-
spec:
  entrypoint: dag-template
  templates: 
  - name: dag-template
    dag:
      tasks:
      - name: roll-dice
        template: task-roll-dice
      - name: six
        template: task-six
        depends: roll-dice.Succeeded
        when: "{{tasks.roll-dice.outputs.result}} == 6"
      - name: not-six
        template: dag-template
        depends: roll-dice.Succeeded
        when: "{{tasks.roll-dice.outputs.result}} != 6"
  - name: task-roll-dice
    script:
      image: python:3.8-slim
      command: [python]
      source: |
          import urllib.request
          import json
          
          # URL to call
          url = "http://engine-controller:8088/status"
          
          try:
              # Perform the GET request
              with urllib.request.urlopen(url) as response:
                  # Read the response and decode it to a string
                  response_body = response.read().decode('utf-8')
                  # Parse the JSON string into a Python dictionary
                  data = json.loads(response_body)
                  
                  # Check the services_health value
                  if data.get("data", {}).get("services_health") == "good":
                      print(6)
                  else:
                      print(0)
          except Exception as e:
              # In case of any error, print 0
              print(0)
  - name: task-six
    script:
      image: python:3.8-slim
      command: [python]
      source: |
        print("Hurra... a 6.")
ArgoWorkflows

Post navigation

Previous Post: [Argo-Workflows] Lesson17: Retry strategy
Next Post: [Argo-Workflows] Lesson19: Workflow Template

More Related Articles

[Argo-Workflows] Lesson5: Output Parameter ArgoWorkflows
[Argo-Workflows] Lesson23: Creating a Master Workflow ArgoWorkflows
[Argo-Workflows] Lesson11: Loops with sets ArgoWorkflows
[Argo-Workflows] Lesson4: Script result – receive the output result of another task to make the input parameter. ArgoWorkflows
[Argo-Workflows] Lesson22: Reference to Workflow Templates ArgoWorkflows
[Argo-Workflows] Lesson19: Workflow Template ArgoWorkflows

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