在 Python 中为 ansible callback_plugin 合并两个 json 字符串的更好方法答案

【问题标题】：Better way of merging two json strings in Python for ansible callback_plugin在 Python 中为 ansible callback_plugin 合并两个 json 字符串的更好方法
【发布时间】：2014-08-14 21:23:00
【问题描述】：

我正在编写一个插件以将日志结果作为 ansible-playbook 的 json 文件返回。

我对 python 不是很熟悉，但我已经一起破解了一些似乎可以工作的东西：

def json_log(res, host):
    if type(res) == type(dict()):
        if 'verbose_override' not in res:
          host_json = JSONEncoder().encode({'host':host})
          result_json = JSONEncoder().encode(res)
          combined_json = host_json + result_json
          combined_json = combined_json.replace("}{", ',')
          print(combined_json)

host_json 类似于：{"host": "centos65"}

result_json 类似于：{"cmd": "echo \"Hello World\" ", "end": "2014-08-01 19:32:38.714584", "stdout": "Hello World", "changed": true, "start": "2014-08-01 19:32:38.707510", "delta": "0:00:00.007074", "stderr": "", "rc": 0, "invocation": {"module_name": "shell", "module_args": "echo \"Hello World\""}}

所以我选择了蛮力路线，只是组合了字符串并删除了它们加入的}{，所以它将采用我想要的有效 json 格式：

{"host": "centos65","cmd": "echo \"Hello World\" ", "end": "2014-08-01 19:32:38.714584", "stdout": "Hello World", "changed": true, "start": "2014-08-01 19:32:38.707510", "delta": "0:00:00.007074", "stderr": "", "rc": 0, "invocation": {"module_name": "shell", "module_args": "echo \"Hello World\""}}

所以现在我只是将两个字符串混合在一起，然后用逗号替换连接，有没有更聪明的方法将它们与 json 开头的主机部分结合起来？

【问题讨论】：

标签： python json ansible ansible-playbook

【解决方案1】：

res = {"cmd": "echo \"Hello World\" ", "end": "2014-08-01 19:32:38.714584", "stdout": "Hello World", "changed": True, "start": "2014-08-01 19:32:38.707510", "delta": "0:00:00.007074", "stderr": "", "rc": 0, "invocation": {"module_name": "shell", "module_args": "echo \"Hello World\""}}

def json_log(res, host):
    if isinstance(res,dict) and 'verbose_override' not in res:  
           res.update({"host": host})        
           combined_json  = JSONEncoder().encode(res)
           print(combined_json)

In [73]: json_log(res,"centos")
{"cmd": "echo \"Hello World\" ", "end": "2014-08-01 19:32:38.714584", "stdout": "Hello World", "changed": true, "rc": 0, "start": "2014-08-01 19:32:38.707510", "host": "centos", "stderr": "", "delta": "0:00:00.007074", "invocation": {"module_name": "shell", "module_args": "echo \"Hello World\""}}

你可以用另一个字典的内容更新一个字典，唯一的问题是你有重复的键并且不想覆盖值。

【讨论】：

我试过这个但得到：File "/Users/peterso/Projects/ansible-json/callback_plugins/json_logs.py", line 13, in json_log combined_json = result_json.update(host_json) AttributeError: 'str' object has no attribute 'update'

【解决方案2】：

由于它们都是字典，因此您可以将两个字典中的一个更新为另一个。例如：

>>> a = {"host": "centos65"}

>>> b = {"cmd": "echo \"Hello World\" ", "end": "2014-08-01 19:32:38.714584", "stdout": "Hello World", "changed": True, "start": "2014-08-01 19:32:38.707510", "delta": "0:00:00.007074", "stderr": "", "rc": 0, "invocation": {"module_name": "shell", "module_args": "echo \"Hello World\""}}

>>> a.update(b)
>>> a
{'cmd': 'echo "Hello World" ', 'end': '2014-08-01 19:32:38.714584', 'stdout': 'Hello World', 'changed': True, 'rc': 0, 'start': '2014-08-01 19:32:38.707510', 'host': 'centos65', 'stderr': '', 'delta': '0:00:00.007074', 'invocation': {'module_name': 'shell', 'module_args': 'echo "Hello World"'}}
>>> a["host"]
'centos65'
>>> a["cmd"]
'echo "Hello World" '
>>>

【讨论】：