# 警告：此脚本将清理指定 etcd 节点
# 使用：`easzctl del-etcd 1.1.1.1` 

- hosts: localhost 
  vars_prompt:
  - name: "ETCD_TO_DEL"
    prompt: "which etcd node is about to be deleted?(e.g 192.168.1.1)"
    private: no
    confirm: yes
  tasks:
  - name: fail info1
    fail: msg="{{ ETCD_TO_DEL }} is NOT a member of etcd cluster!"
    when: "ETCD_TO_DEL not in groups['etcd']" 

  - name: fail info2
    fail: msg="you CAN NOT delete the last member of etcd cluster!"
    when: "groups['etcd']|length < 2" 

  - block:
    # 以下几个tasks是为寻找etcd集群中第一个健康节点
    - name: set NODE_IPS of the etcd cluster
      set_fact: NODE_IPS="{% for host in groups['etcd'] %}{{ host }} {% endfor %}"

    - name: get etcd cluster status
      shell: 'for ip in {{ NODE_IPS }};do \
                ETCDCTL_API=3 {{ base_dir }}/bin/etcdctl \
                --endpoints=https://"$ip":2379 \
                --cacert={{ base_dir }}/.cluster/ssl/ca.pem \
                --cert={{ base_dir }}/.cluster/ssl/admin.pem \
                --key={{ base_dir }}/.cluster/ssl/admin-key.pem \
                endpoint health; \
              done'
      register: ETCD_CLUSTER_STATUS

    - debug: var="ETCD_CLUSTER_STATUS.stdout"

    - name: get a running ectd node
      shell: 'echo -e "{{ ETCD_CLUSTER_STATUS.stdout }}"|grep "is healthy"|sed -n "1p"|cut -d: -f2|cut -d/ -f3'
      register: RUNNING_NODE

    - debug: var="RUNNING_NODE.stdout"

    # 在etcd健康节点上才能进行操作
    - name: get ID of etcd node to delete
      shell: "ETCDCTL_API=3 {{ bin_dir }}/etcdctl member list|grep {{ ETCD_TO_DEL }}:2380|cut -d',' -f1"
      register: ETCD_ID
      delegate_to: "{{ RUNNING_NODE.stdout }}"
  
    - name: get NAME of etcd node to delete
      shell: "ETCDCTL_API=3 {{ bin_dir }}/etcdctl member list|grep {{ ETCD_TO_DEL }}:2380|cut -d' ' -f3|cut -d',' -f1"
      register: ETCD_NAME
      delegate_to: "{{ RUNNING_NODE.stdout }}"
  
    - name: delete a etcd member
      shell: "ETCDCTL_API=3 {{ bin_dir }}/etcdctl member remove {{ ETCD_ID.stdout }}"
      delegate_to: "{{ RUNNING_NODE.stdout }}"
      when: "ETCD_ID.stdout != ''"
  
    #- name: remove data of the deleted etcd node if possible
    #  file: name=/var/lib/etcd state=absent
    #  delegate_to: "{{ ETCD_TO_DEL }}"
    #  ignore_errors: true

    - name: remove data of the deleted etcd node if possible
      shell: "ssh {{ ETCD_TO_DEL }} rm -rf /var/lib/etcd"
      ignore_errors: true

    # 在[etcd]组内删除node节点，lineinfile模块不好用，只能用sed
    - name: remove the etcd's node entry in hosts
      shell: 'sed -i "/^\[etcd/,/^\[kube-master/ {/^{{ ETCD_TO_DEL }}[^0-9]/d}" {{ base_dir }}/hosts'
      args:
        warn: false

    - name: reconfig and restart the etcd cluster
      shell: "ansible-playbook {{ base_dir }}/02.etcd.yml > /tmp/ansible-playbook.log 2>&1"

    # 满足条件才进行删除
    when: "groups['etcd']|length > 1 and ETCD_TO_DEL in groups['etcd']"