import json

from collections import namedtuple

from ansible.parsing.dataloader import DataLoader

from ansible.vars import VariableManager

from ansible.inventory import Inventory

from ansible.playbook.play import Play

from ansible.executor.task_queue_manager import TaskQueueManager
from ansible.executor.task_result import TaskResult

from ansible.plugins.callback import CallbackBase

# 自定义 callback，即在运行 api 后调用本类中的 v2_runner_on_ok()，在这里会输出 host 和 result 格式

class ResultCallback(CallbackBase):

    """A sample callback plugin used for performing an action as results come in

    If you want to collect all results into a single object for processing at

    the end of the execution, look into utilizing the ``json`` callback plugin

    or writing your own custom callback plugin

    """

    def v2_runner_on_ok(self, result, **kwargs):

        """Print a json representation of the result

        This method could store the result in an instance attribute for retrieval later

        """

        # result 包含'_check_key', '_host', '_result', '_task', 'is_changed', 'is_failed', 'is_skipped', 'is_unreachable'

        host = result._host

        print json.dumps({host.name: result._result}, indent=4)

    """

    def v2_on_any(self, *args, **kwargs):

        if isinstance(args[0], TaskResult):

            print json.dumps({args[0]._host.name: args[0]._result}, indent=4)

    """

Options = namedtuple('Options', ['connection', 'module_path', 'forks', 'become', 'become_method', 'become_user', 'check'])

# initialize needed objects

variable_manager = VariableManager()

loader = DataLoader()

options = Options(connection='smart', module_path=None, forks=100, become=None, become_method=None, become_user=None, check=False)

passwords = dict(conn_pass='mypassword')  # 目前只发现有两个key，conn_pass, become_pass

# Instantiate our ResultCallback for handling results as they come in

results_callback = ResultCallback()

# create inventory and pass to var manager

inventory = Inventory(loader=loader, variable_manager=variable_manager, host_list='hosts')  
# hosts文件，也可以是 ip列表 '10.1.162.18:322, 10.1.167.36' 或者 ['10.1.162.18:322', '10.1.167.36']

variable_manager.set_inventory(inventory)

# create play with tasks

play_source =  dict(

        name = "Ansible Play",

        hosts = 'web',   # 对应 playbook 入口yaml文件的 hosts变量，也可以是 ip 10.1.162.18

        gather_facts = 'no',

        tasks = [

            dict(action=dict(module='shell', args='ifconfig'), register='shell_out'),

            #dict(action=dict(module='debug', args=dict(msg='{{shell_out.stdout}}')))

         ]

    )

play = Play().load(play_source, variable_manager=variable_manager, loader=loader)

# actually run it

# TaskQueueManager 是创建进程池，负责输出结果和多进程间数据结构或者队列的共享协作

tqm = None

try:

    tqm = TaskQueueManager(

              inventory=inventory,

              variable_manager=variable_manager,

              loader=loader,

              options=options,

              passwords=passwords,

              stdout_callback=results_callback,  # Use our custom callback instead of the ``default`` callback plugin

              # 如果注释掉 callback 则会调用原生的 DEFAULT_STDOUT_CALLBACK，输出 task result的output，同 ansible-playbook debug

          )

    result = tqm.run(play)

    print result  # 返回码，只要有一个 host 出错就会返回 非0 数字

finally:

    if tqm is not None:

        tqm.cleanup()

v2_runner_on_failed(self, result, ignore_errors=False)

v2_runner_on_ok(self, result)

v2_runner_on_skipped(self, result)

v2_runner_on_unreachable(self, result)

v2_runner_on_no_hosts(self, task)