#!/usr/bin/env python
# -*- coding:utf-8 -*-
__author__ = 'ZL'

import yaml,os

class ConfigManager():
    def __init__(self,congif_path='config.yaml'):
        self.ok = False

        if os.path.exists(congif_path):
            self.file_path = congif_path
            self.ok = self.read_yaml()
        else:
            congif_path = "../" + congif_path
            if os.path.exists(congif_path):
                self.file_path = congif_path
                self.ok= self.read_yaml()
            else:
                raise Exception('没有找到%s文件路径'%congif_path)
        print("ConfigManager实例化")

    def __del__(self):
        print("ConfigManager销毁")

    def read_yaml(self):
        with open(self.file_path,'r',encoding='utf_8') as f:
            self.data = yaml.safe_load(f)
            return True
        return False

    '''
    以.作为层级节点分割符
    '''
    def get_data(self,pwd=None):
        if self.ok:
            if pwd is None:
                return None
            nodes = pwd.split('.')
            current_node= self.data
            for node in nodes:
                if node in current_node:
                    current_node = current_node[node]
                else:
                    print(f"Node {node} not found in the YAML data.")
                    return None

        return current_node


#这种方法实现的单例优点是简单，但不能动态创建实例，程序加载时就已实例化。
myCongif = ConfigManager()

if __name__ == '__main__':
    r = myCongif.get_data('mysql.host1')
    print(r)