Robot Framework中操作K8s V1ConfigMap类对象及Patch的问题求助

需求说明 #

• 使用Python获取指定K8s ConfigMap详情
• 在Robot Framework中修改返回的V1ConfigMap类对象
• 传入修改后的对象调用Patch ConfigMap方法

现有代码 #

Python库代码 #

from kubernetes import client, config, utils

def get_config_map(self, configmap_name, namespace):
        try:
            api = client.CoreV1Api()
            resp = api.read_namespaced_config_map(name= configmap_name, namespace= namespace)  # 返回V1ConfigMap类对象
            return(resp)      
        except Exception as e:
            raise

def patch_config_map(self, configmap_name, namespace, body):
        try:
            api = client.CoreV1Api()
            resp = api.patch_namespaced_config_map(name= configmap_name, namespace= namespace, body= body)
        except Exception as e:
            raise

Robot Framework测试代码 #

*** Test Cases ***

patch config map
    [Documentation]    Patch the config map
    [tags]    performance    test-weekly     prom
    ${configmap_details}=   get config map      configmap_name=${perf_configmap_name}    namespace=${namespace}
    Log     ${configmap_details}['data']
    # 此处需要操作返回的类对象
    # 执行时出现如下错误

执行错误信息 #

Variable '${configmap_details}' is V1ConfigMap, which is not subscriptable, and thus accessing item 'data' from it is not possible. To use '[data]' as a literal value, it needs to be escaped like '[data]'

问题核心 #

能否在Robot Framework中操作V1ConfigMap类对象？如何正确完成修改与Patch操作？

解决方案 #

1. 可行性结论 #

Robot Framework完全可以操作V1ConfigMap类对象，但不能用字典下标[]访问类属性，需改用类属性的点.语法。

2. 正确操作步骤 #

方式一：直接在Robot Framework中修改属性

V1ConfigMap的data属性本身是字典类型，先通过点语法拿到该属性，再用下标修改内部键值：

*** Test Cases ***

patch config map
    [Documentation]    Patch the config map
    [tags]    performance    test-weekly     prom
    ${configmap_details}=   get config map      configmap_name=${perf_configmap_name}    namespace=${namespace}
    # 用点语法访问类的data属性，而非下标
    Log     ${configmap_details.data}
    # 修改data中的指定键值
    ${configmap_details.data}[target_key] =    Set Variable    new_target_value
    # 传入修改后的对象执行Patch
    patch config map    configmap_name=${perf_configmap_name}    namespace=${namespace}    body=${configmap_details}

方式二：封装Python辅助方法（更稳定）

如果担心Robot Framework操作类对象的兼容性，可在Python库中新增修改方法，直接在Python层面处理：

def modify_config_map_data(self, configmap_obj, key, new_value):
    try:
        # 处理data为空的情况
        if not configmap_obj.data:
            configmap_obj.data = {}
        configmap_obj.data[key] = new_value
        return configmap_obj
    except Exception as e:
        raise

然后在Robot Framework中调用：

*** Test Cases ***

patch config map
    [Documentation]    Patch the config map
    [tags]    performance    test-weekly     prom
    ${configmap_details}=   get config map      configmap_name=${perf_configmap_name}    namespace=${namespace}
    # 调用Python辅助方法修改ConfigMap
    ${modified_configmap}=   modify config map data    configmap_obj=${configmap_details}    key=target_key    new_value=new_target_value
    # 执行Patch操作
    patch config map    configmap_name=${perf_configmap_name}    namespace=${namespace}    body=${modified_configmap}

3. 轻量化Patch技巧 #

如果仅需修改部分字段，无需传递完整V1ConfigMap对象，直接构造包含修改内容的字典传入即可：

*** Test Cases ***

patch config map
    [Documentation]    Patch the config map
    [tags]    performance    test-weekly     prom
    # 构造仅含修改内容的字典
    ${patch_body}=    Create Dictionary    data=${{"target_key": "new_target_value"}}
    # 传入字典执行Patch
    patch config map    configmap_name=${perf_configmap_name}    namespace=${namespace}    body=${patch_body}

内容的提问来源于stack exchange，提问作者preeya krish