algo/roles/cloud-gce/tasks/prompts.yml

---
- pause:
    prompt: |
      Enter the local path to your credentials JSON file
      (https://support.google.com/cloud/answer/6158849?hl=en&ref_topic=6262490#serviceaccounts)
  register: _gce_credentials_file
  when:
    - gce_credentials_file is undefined
    - lookup('env','GCE_CREDENTIALS_FILE_PATH')|length <= 0

- set_fact:
    credentials_file_path: "{{ gce_credentials_file | default(_gce_credentials_file.user_input|default(None)) | default(lookup('env','GCE_CREDENTIALS_FILE_PATH'), true) }}"
    ssh_public_key_lookup: "{{ lookup('file', '{{ SSH_keys.public }}') }}"

- set_fact:
    credentials_file_lookup: "{{ lookup('file', '{{ credentials_file_path }}') }}"

- set_fact:
    service_account_email: "{{ credentials_file_lookup.client_email | default(lookup('env','GCE_EMAIL')) }}"
    project_id: "{{ credentials_file_lookup.project_id | default(lookup('env','GCE_PROJECT')) }}"

- block:
  - name: Get regions
    gcp_compute_location_info:
      auth_kind: serviceaccount
      service_account_file: "{{ credentials_file_path }}"
      project: "{{ project_id }}"
      scope: regions
      filters: status=UP
    register: gcp_compute_regions_info

  - name: Set facts about the regions
    set_fact:
      gce_regions: >-
        [{%- for region in gcp_compute_regions_info.resources | sort(attribute='name') -%}
            '{{ region.name }}'{% if not loop.last %},{% endif %}
        {%- endfor -%}]

  - name: Set facts about the default region
    set_fact:
      default_region: >-
        {% for region in gce_regions %}
          {%- if region == "us-east1" %}{{ loop.index }}{% endif %}
        {%- endfor %}

  - pause:
      prompt: |
        What region should the server be located in?
        (https://cloud.google.com/compute/docs/regions-zones/#locations)
          {% for r in gce_regions %}
          {{ loop.index }}. {{ r }}
          {% endfor %}

        Enter the number of your desired region
        [{{ default_region }}]
    register: _gce_region
  when: region is undefined

- name: Set region as a fact
  set_fact:
    algo_region: >-
      {% if region is defined %}{{ region }}
      {%- elif _gce_region.user_input %}{{ gce_regions[_gce_region.user_input | int -1 ] }}
      {%- else %}{{ gce_regions[default_region | int - 1] }}{% endif %}

- name: Get zones
  gcp_compute_location_info:
    auth_kind: serviceaccount
    service_account_file: "{{ credentials_file_path }}"
    project: "{{ project_id }}"
    scope: zones
    filters:
      - "name={{ algo_region }}-*"
      - "status=UP"
  register: gcp_compute_zone_info

- name: Set random available zone as a fact
  set_fact:
    algo_zone: "{{ (gcp_compute_zone_info.resources | random(seed=algo_server_name + algo_region + project_id) ).name }}"