---
version: "2.0"

name: calculator

actions:
  calc_summ:
    description: HTTP request to the server.
    base: std.http
    base-input:
      url: 'http://<% $.vm_ip %>:5000/summ'
      method: POST
      body:
        arguments: <% $.arguments %>
    output:
      summ_result: <% $.content.result %>
    input:
      - vm_ip
      - arguments

  run_calculator_server:
    description: SSH command to run the server.
    base: std.ssh
    base-input:
      host: <% $.host %>
      username: <% $.username %>
      password: <% $.password %>
      cmd: 'nohup python ~/web_app.py > web_app.log &'
    input:
      - host
      - username
      - password

workflows:
  run_calculator:
    type: direct

    input:
      - server_name # Name of the new instance
      - image_id  # image id from Glance service
      - flavor_id # flavor id - type of instance hardware
      - ssh_username # VM username
      - ssh_password # VM password
      - to_email # email address to send notifications to
      - from_email # email address to send notifications from
      - smtp_server # SMTP server to use for sending emails (e.g. smtp.gmail.com:587)
      - smtp_password # password to connect to SMTP server

    task-defaults:
      on-error:
       - send_create_vm_error

    description: |
      This workflow spins up a vm,
      deploys calculator web app on it
      and runs the calculation by sending
      a request to calculator app.

    tasks:
      create_vm:
        description: Initial request to create a VM.
        workflow: std.create_instance
        input:
          name: <% $.server_name %>
          image_id: <% $.image_id %>
          flavor_id: <% $.flavor_id %>
          ssh_username: <% $.ssh_username %>
          ssh_password: <% $.ssh_password %>
        publish:
          vm_id: <% task(create_vm).result.id %>
          vm_ip: <% task(create_vm).result.ip %>
        on-success:
          - run_server

      run_server:
        description: When VM is up, we are able to run the server on VM (SSH command).
        action: run_calculator_server host=<% $.vm_ip %> username=<% $.ssh_username %> password=<% $.ssh_password %>
        on-success:
          - calc_summ

      calc_summ:
        description: Send HTTP request on server and calc the result.
        action: calc_summ arguments=[32, 45, 23] vm_ip=<% $.vm_ip %>
        retry:
          count: 10
          delay: 1
        publish:
          result: <% task(calc_summ).result.summ_result %>
        on-complete:
          - send_result_email

      send_result_email:
        description: Email the result of the calculation.
        action: std.email
        input:
          from_addr: <% $.from_email %>
          to_addrs: [<% $.to_email %>]
          subject: Workflow result
          body: |
            Workflow result of execution <% execution().id %> is <% $.result %>

            -- Thanks, Mistral Team.
          smtp_server: <% $.smtp_server %>
          smtp_password: <% $.smtp_password %>
        on-complete:
          - delete_vm

      send_create_vm_error:
        description: In case of createVM error send e-mail with error message.
        action: std.email
        input:
          from_addr: <% $.from_email %>
          to_addrs: [<% $.to_email %>]
          subject: Workflow error
          body: |
            Failed to create a VM in execution <% execution().id %>

            -- Thanks, Mistral Team.
          smtp_server: <% $.smtp_server %>
          smtp_password: <% $.smtp_password %>
        on-complete:
          - delete_vm

      delete_vm:
        description: Destroy VM.
        workflow: std.delete_instance instance_id=<% $.vm_id %>
        on-error:
          - fail