python - 如何在 python-eve 应用程序中进行自定义插入

Question

我在 eve 应用程序中有一些自定义的 flask 方法需要与 telnet 设备通信并返回结果，但我也想在从此 telnet 设备检索数据后将数据预填充到某些资源中，如下所示:

@app.route("/get_vlan_description", methods=['POST'])
def get_vlan_description():
    switch = prepare_switch(request)
    result = dispatch_switch_command(switch, 'get_vlan_description')

    # TODO: populate vlans resource with result data and return status

我的 settings.py 看起来像这样:

SERVER_NAME = '127.0.0.1:5000'
DOMAIN = {
    'vlans': {
        'id': {
            'type': 'integer',
            'required': True,
            'unique': True
        },
        'subnet': {
            'type': 'string',
            'required': True
        },
        'description': {
            'type': 'boolean',
            'default': False
        }
    }
}

我无法找到有关如何直接访问 mongo 资源并插入此数据的文档或源代码。

Answer 1

你看过 on_insert 吗？钩？来自文档:

When documents are about to be stored in the database, both on_insert(resource, documents) and on_insert_<resource>(documents) events are raised. Callback functions could hook into these events to arbitrarily add new fields, or edit existing ones. on_insert is raised on every resource being updated while on_insert_<resource> is raised when the <resource> endpoint has been hit with a POST request. In both circumstances, the event will be raised only if at least one document passed validation and is going to be inserted. documents is a list and only contains documents ready for insertion (payload documents that did not pass validation are not included).

所以，如果我得到了你想要实现的目标，你可以有这样的东西:

def telnet_service(resource, documents):
    """ 
        fetch data from telnet device;
        update 'documents' accordingly 
    """
    pass

app = Eve()
app.on_insert += telnet_service

if __name__ == "__main__":
    app.run()

请注意，这样您就不必直接处理数据库，因为 Eve 会处理这些事情。

如果您不想存储 telnet 数据，而只想将其与获取的文档一起发回，您可以 Hook on_fetch 相反。

最后，如果你真的想使用数据层，你可以使用 app.data.driver如 this example snippet 中所示.