launch.yml

- name: Launch twitterbot instance
  hosts: localhost
  vars_files:
    - secrets.yml
  tasks:

    - name: Set up security group for twitter bot
      ec2_group:
        name: sg_grauniad_bot
        description: Security group for Grauniad twitter bot
        vpc_id: "{{ secrets.vpc_id }}"
        region: "{{ secrets.cloud_region }}"
        rules:
          - proto: tcp
            from_port: 22
            to_port: 22
            cidr_ip: "{{ secrets.home_ip }}/32"

    - name: Gather security group information
      command: >
        aws ec2 describe-security-groups
        --filters Name=vpc-id,Values="{{secrets.vpc_id}}"
        --filters Name=group-name,Values=sg_grauniad_bot
        --region "{{secrets.cloud_region}}"
      register: sec_groups_query
      changed_when: false

    - name: Process security groups list
      set_fact:
        sec_groups: "{{ sec_groups_query.stdout|from_json }}"
      when: "sec_groups_query.stdout is defined and {{(sec_groups_query.stdout|length)>0}}"

    - name: Launch twitter bot machine
      ec2:
        region: "{{ secrets.cloud_region }}"
        instance_type: t2.nano
        image: ami-692d751a
        count_tag:
          Name: "Grauniad twitter bot"
        exact_count: "{{server_count}}"
        instance_tags:
          Name: "Grauniad twitter bot"
          Launcher: Ansible
        group_id: "{{ sec_groups.SecurityGroups | map(attribute='GroupId') | list }}"
        assign_public_ip: True
        vpc_subnet_id: "{{ secrets.vpc_subnet_id }}"
        key_name: "{{ secrets.key_name }}"
        wait: True
      register: ec2_twitterbots

    - name: Add new instance to host group
      add_host: hostname={{ item.public_ip }} groupname=twitterbot
      with_items: '{{ ec2_twitterbots.instances }}'

    - name: Wait for SSH to come up
      wait_for: host={{ item.public_dns_name }} port=22 delay=60 timeout=320 state=started
      with_items: '{{ ec2_twitterbots.instances }}'
      when: server_count|int > 0

- name: Provision instance
  hosts: twitterbot
  remote_user: ubuntu

  tasks:

    - name: Install packages
      apt: name={{ item }} state=present
      with_items:
        - nodejs
        - npm
      become: True
      become_method: sudo
      register: apt_result
      until: apt_result.failed is undefined
      retries: 150
      delay: 5

    - name: Create symlink to nodejs
      shell: ln -s /usr/bin/nodejs /usr/bin/node
      become: True
      become_method: sudo

    - name: Upload bot script
      copy:
        src: "{{ item }}"
        dest: /home/ubuntu/
      with_items:
        - bot/bot.js
        - bot/package.json
        - twitter_secrets.json

    - name: Install npm package
      shell: npm install

    - name: Install forever npm package
      shell: npm install forever -g
      become: True
      become_method: sudo

    # https://github.com/foreverjs/forever
    - name: Start bot as daemon
      shell: forever start bot.js