140 lines
4.6 KiB
Python
140 lines
4.6 KiB
Python
import asyncio
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import threading
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import time
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import redis
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from datetime import datetime, timezone
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from zoneinfo import ZoneInfo # Python 3.9+
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from bleak import BleakScanner, BleakClient
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from typing import Set, Iterable
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from config import *
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from sensors import *
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from ble import *
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from ble_redis import *
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# In-memory cache + thread-safe lock
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_mac_cache: Set[str] = set()
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_lock = threading.Lock()
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_sensors_cache = []
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# other vars
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MI_SERVICE_UUID = "ebe0ccb0-7a0a-4b0c-8a1a-6ff2997da3a6"
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TEMP_CHAR_UUID = "ebe0ccc1-7a0a-4b0c-8a1a-6ff2997da3a6"
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# Redis Functions
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r = redis.Redis(host=bind_ip, port=redis_port)
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def update_redis(data):
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# push data to redis
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# Publish to the Redis channel that the WS server is listening on
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r.publish('temp_hum', json.dumps(data))
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if debug_output:
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print("=== Stats Redis Update ===")
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print(json.dumps(data, indent=2))
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return True
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# this function filters MACs
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def _is_match(mac: str, name: str) -> bool:
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"""Return True if the MAC starts with the configured prefix and is correct model."""
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if name == "LYWSD03MMC":
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return mac.upper().startswith(MAC_PREFIX.upper())
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# this function scans for MACs
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async def _scan_once() -> Iterable[str]:
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"""Do one scan cycle and return the matching MACs."""
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devices = await BleakScanner.discover(timeout=5.0) # 5s scan
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return [dev.address for dev in devices if _is_match(dev.address, dev.name)]
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# this very important function updates the MAC cache and the sensor objects
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def update_cache() -> None:
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"""
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Called by the scheduler (in a separate thread). It runs a tiny
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asyncio event loop to call the Bleak scan, then updates the cache.
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"""
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# Run the async scan in a fresh loop; Bleak requires this.
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# Gets the MACs
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new_macs = scan_macs()
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print(f"[Scanner] Updated cache, {len(_mac_cache)} unique MAC(s).")
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print("Updating data for current MACs...")
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# now that we have MACs, let's get sensor data
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sensor_data = None
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try:
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sensor_data = sensor_data_query(new_macs)
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print(sensor_data)
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except Exception as e:
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print(f"Aww fuck, no data :( - {e}")
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# now we update the data in the sensor objects
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for sensor_datum in sensor_data:
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print(f"MAC - {sensor_datum['name']} | temp - {sensor_datum['temp']} | humidity - {sensor_datum['humidity']}")
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for sensor in _sensors_cache:
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if sensor.name == sensor_datum['name']:
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sensor.add_or_update(key="temp", value=sensor_datum['temp'])
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sensor.add_or_update(key="humidity", value=sensor_datum['humidity'])
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# if redis is enabled, push full details to the redis server
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if enable_redis:
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update_redis(get_sensor_details())
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# this helper function scans for MACs
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def scan_macs():
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new_macs = asyncio.run(_scan_once())
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with _lock:
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print("MACs found:")
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for new_mac in new_macs:
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print(f"{new_mac}")
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new_sensor = Sensor(name=f"{new_mac}")
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if new_mac not in set(_mac_cache):
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_sensors_cache.append(new_sensor)
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_mac_cache.update(new_macs)
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return new_macs
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# return just the MACs
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def get_cache_snapshot() -> Set[str]:
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"""Return a thread-safe snapshot of the current cache."""
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with _lock:
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return set(_mac_cache)
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# return sensor data and timestamps, can return int or string
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def get_sensor_details(friendly_date = False):
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sensor_list = []
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for sensor in _sensors_cache:
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first_seen = sensor.first_seen
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last_seen = sensor.last_seen
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if friendly_date:
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first_seen = ts_to_pst_string(sensor.first_seen)
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last_seen = ts_to_pst_string(sensor.last_seen)
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print(f"Summary - {sensor.name}")
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new_sensor = {
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"name": sensor.name,
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"first_seen": first_seen,
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"last_seen": last_seen,
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"comment": sensor.comment,
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"data": sensor.to_dict()
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}
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sensor_list.append(new_sensor)
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result = {
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"sensors": sensor_list
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}
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return result
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# return just sensor data without timestamps
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def get_sensor_summary():
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sensor_list = []
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for sensor in _sensors_cache:
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print(f"Summary - {sensor.name}")
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new_sensor = {
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"name": sensor.name,
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"comment": sensor.comment,
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"data": sensor.to_dict(simple_return=True)
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}
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sensor_list.append(new_sensor)
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result = {
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"sensors": sensor_list
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}
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return result
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# helper function for ts int to string
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def ts_to_pst_string(ts_str):
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utc_dt = datetime.fromtimestamp(ts_str, tz=timezone.utc)
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pacific_dt = utc_dt.astimezone(ZoneInfo("America/Los_Angeles"))
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return pacific_dt.strftime("%Y-%m-%d %H:%M:%S")
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