XiaoMi/custom_components/xiaomi_home/miot/common.py

# -*- coding: utf-8 -*-
"""
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Common utilities.
"""
import json
from os import path
import random
from typing import Optional
import hashlib
from paho.mqtt.client import MQTTMatcher
import yaml

MIOT_ROOT_PATH: str = path.dirname(path.abspath(__file__))


def gen_absolute_path(relative_path: str) -> str:
    """Generate an absolute path."""
    return path.join(MIOT_ROOT_PATH, relative_path)


def calc_group_id(uid: str, home_id: str) -> str:
    """Calculate the group ID based on a user ID and a home ID."""
    return hashlib.sha1(
        f'{uid}central_service{home_id}'.encode('utf-8')).hexdigest()[:16]


def load_json_file(json_file: str) -> dict:
    """Load a JSON file."""
    with open(json_file, 'r', encoding='utf-8') as f:
        return json.load(f)


def load_yaml_file(yaml_file: str) -> dict:
    """Load a YAML file."""
    with open(yaml_file, 'r', encoding='utf-8') as f:
        return yaml.load(f, Loader=yaml.FullLoader)


def randomize_int(value: int, ratio: float) -> int:
    """Randomize an integer value."""
    return int(value * (1 - ratio + random.random()*2*ratio))


class MIoTMatcher(MQTTMatcher):
    """MIoT Pub/Sub topic matcher."""

    def iter_all_nodes(self) -> any:
        """Return an iterator on all nodes with their paths and contents."""
        def rec(node, path_):
            # pylint: disable=protected-access
            if node._content:
                yield ('/'.join(path_), node._content)
            for part, child in node._children.items():
                yield from rec(child, path_ + [part])
        return rec(self._root, [])

    def get(self, topic: str) -> Optional[any]:
        try:
            return self[topic]
        except KeyError:
            return None