Rewritten `serial` plugin.
`backend.serial` has been removed and the polling logic merged into the `serial` plugin. The `serial` plugin now supports the new entity engine as well.
This commit is contained in:
parent
4f15758de9
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GPG Key ID:
D90FBA7F76362774
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@ -1,27 +0,0 @@
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from platypush.backend.sensor import SensorBackend
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class SensorSerialBackend(SensorBackend):
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"""
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This backend listens for new events from sensors connected through a serial
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interface (like Arduino) acting as a wrapper for the ``serial`` plugin.
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Requires:
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* The :mod:`platypush.plugins.serial` plugin configured
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Triggers:
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* :class:`platypush.message.event.sensor.SensorDataChangeEvent` if the measurements of a sensor have changed
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* :class:`platypush.message.event.sensor.SensorDataAboveThresholdEvent` if the measurements of a sensor have
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gone above a configured threshold
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* :class:`platypush.message.event.sensor.SensorDataBelowThresholdEvent` if the measurements of a sensor have
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gone below a configured threshold
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"""
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def __init__(self, **kwargs):
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super().__init__(plugin='serial', **kwargs)
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# vim:sw=4:ts=4:et:
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@ -1,12 +0,0 @@
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manifest:
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events:
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platypush.message.event.sensor.SensorDataAboveThresholdEvent: if the measurements
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of a sensor havegone above a configured threshold
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platypush.message.event.sensor.SensorDataBelowThresholdEvent: if the measurements
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of a sensor havegone below a configured threshold
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platypush.message.event.sensor.SensorDataChangeEvent: if the measurements of a
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sensor have changed
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install:
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pip: []
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package: platypush.backend.sensor.serial
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type: backend
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@ -1,47 +1,137 @@
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import base64
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from collections import namedtuple
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from collections.abc import Collection
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import json
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import serial
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from typing import Any, List, Optional, Tuple, Union
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import threading
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import time
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from typing_extensions import override
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from platypush.plugins import action
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from platypush.plugins.sensor import SensorPlugin
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from serial import Serial
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from platypush.context import get_bus
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from platypush.entities.devices import Device
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from platypush.entities.sensors import RawSensor, NumericSensor
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from platypush.entities.managers.sensors import SensorEntityManager
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from platypush.message.event.sensor import SensorDataChangeEvent
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from platypush.plugins import RunnablePlugin, action
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from platypush.utils import get_lock, get_plugin_name_by_class
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_DeviceAndRate = namedtuple('_DeviceAndRate', ['device', 'baud_rate'])
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class SerialPlugin(SensorPlugin):
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class SerialPlugin(RunnablePlugin, SensorEntityManager):
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"""
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The serial plugin can read data from a serial device, as long as the serial
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device returns a JSON. You can use this plugin to interact for example with
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some sensors connected through an Arduino. Just make sure that the code on
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your serial device returns JSON values. If you're using an Arduino or any
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ATMega compatible device, take a look at
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https://github.com/bblanchon/ArduinoJson.
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The serial plugin can read data from a serial device.
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If the device returns a JSON string, then that string will be parsed for
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individual values. For example:
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.. code-block:: json
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{"temperature": 25.0, "humidity": 15.0}
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If the serial device returns such a value, then ``temperature`` and
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``humidity`` will be parsed as separate entities with the same names as the
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keys provided on the payload.
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The JSON option is a good choice if you have an Arduino/ESP-like device
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whose code you can control, as it allows to easily send data to Platypush
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in a simple key-value format. The use-case would be that of an Arduino/ESP
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device that pushes data on the wire, and this integration would then listen
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for updates.
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Alternatively, you can also use this integration in a more traditional way
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through the :meth:`.read` and :meth:`.write` methods to read and write data
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to the device. In such a case, you may want to disable the "smart polling"
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by setting ``enable_polling`` to ``False`` in the configuration.
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If you want an out-of-the-box solution with a Firmata-compatible firmware,
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you may consider using the :class:`platypush.plugin.arduino.ArduinoPlugin`
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instead.
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Note that device paths on Linux may be subject to change. If you want to
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create static naming associations for your devices (e.g. make sure that
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your Arduino will always be symlinked to ``/dev/arduino`` instead of
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``/dev/ttyUSB<n>``), you may consider creating `static mappings through
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udev
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<https://dev.to/enbis/how-udev-rules-can-help-us-to-recognize-a-usb-to-serial-device-over-dev-tty-interface-pbk>`_.
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Requires:
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* **pyserial** (``pip install pyserial``)
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Triggers:
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* :class:`platypush.message.event.sensor.SensorDataChangeEvent`
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"""
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def __init__(self, device=None, baud_rate=9600, **kwargs):
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_default_lock_timeout: float = 2.0
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def __init__(
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self,
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device: Optional[str] = None,
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baud_rate: int = 9600,
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max_size: int = 1 << 19,
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timeout: float = _default_lock_timeout,
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enable_polling: bool = True,
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**kwargs,
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):
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"""
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:param device: Device path (e.g. ``/dev/ttyUSB0`` or ``/dev/ttyACM0``)
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:type device: str
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:param baud_rate: Serial baud rate (default: 9600)
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:type baud_rate: int
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:param max_size: Maximum size of a JSON payload (default: 512 KB). The
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plugin will keep reading bytes from the wire until it can form a
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valid JSON payload, so this upper limit is required to prevent the
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integration from listening forever and dumping garbage in memory.
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:param timeout: This integration will ensure that only one
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reader/writer can access the serial device at the time, in order to
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prevent mixing up bytes in the response. This value specifies how
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long we should wait for a pending action to terminate when we try
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to run a new action. Default: 2 seconds.
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:param enable_polling: If ``False``, the plugin will not poll the
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device for updates. This can be the case if you want to
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programmatically interface with the device via the :meth:`.read`
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and :meth:`.write` methods instead of polling for updates in JSON
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format.
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"""
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super().__init__(**kwargs)
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self.device = device
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self.baud_rate = baud_rate
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self.serial = None
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self.serial_lock = threading.Lock()
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self.last_measurement = None
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self.serial_lock = threading.RLock()
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self.last_data: dict = {}
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self._max_size = max_size
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self._timeout = timeout
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self._enable_polling = enable_polling
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def _read_json(self, serial_port):
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def _read_json(
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self,
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serial_port: Serial,
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max_size: Optional[int] = None,
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) -> str:
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"""
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Reads a JSON payload from the wire. It counts the number of curly
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brackets detected, ignoring everything before the first curly bracket,
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and it stops when the processed payload has balanced curly brackets -
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i.e. it can be mapped to JSON.
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:param serial_port: Serial connection.
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:param max_size: Default ``max_size`` override.
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"""
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n_brackets = 0
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is_escaped_ch = False
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parse_start = False
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output = bytes()
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max_size = max_size or self._max_size
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while True:
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assert len(output) <= max_size, (
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'Maximum allowed size exceeded while reading from the device: '
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f'read {len(output)} bytes'
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)
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ch = serial_port.read()
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if not ch:
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break
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@ -70,15 +160,27 @@ class SerialPlugin(SensorPlugin):
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return output.decode().strip()
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def _get_serial(self, device=None, baud_rate=None, reset=False):
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def __get_serial(
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self,
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device: Optional[str] = None,
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baud_rate: Optional[int] = None,
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reset: bool = False,
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) -> Serial:
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"""
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Return a ``Serial`` connection object to the given device.
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:param device: Default device path override.
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:param baud_rate: Default baud rate override.
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:param reset: By default, if a connection to the device is already open
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then the current object will be returned. If ``reset=True``, the
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connection will be reset and a new one will be created instead.
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"""
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if not device:
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if not self.device:
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raise RuntimeError('No device specified nor default device configured')
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assert self.device, 'No device specified nor default device configured'
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device = self.device
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if baud_rate is None:
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if self.baud_rate is None:
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raise RuntimeError('No baud_rate specified nor default configured')
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assert self.baud_rate, 'No baud_rate specified nor default configured'
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baud_rate = self.baud_rate
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if self.serial:
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@ -87,192 +189,284 @@ class SerialPlugin(SensorPlugin):
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self._close_serial()
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self.serial = serial.Serial(device, baud_rate)
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self.serial = Serial(device, baud_rate)
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return self.serial
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def _get_serial(
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self,
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device: Optional[str] = None,
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baud_rate: Optional[int] = None,
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) -> Serial:
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"""
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Return a ``Serial`` connection object to the given device.
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:param device: Default device path override.
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:param baud_rate: Default baud rate override.
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:param reset: By default, if a connection to the device is already open
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then the current object will be returned. If ``reset=True``, the
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connection will be reset and a new one will be created instead.
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"""
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try:
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return self.__get_serial(device, baud_rate)
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except AssertionError as e:
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raise e
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except Exception as e:
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self.logger.debug(e)
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self.wait_stop(1)
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return self.__get_serial(device=device, baud_rate=baud_rate, reset=True)
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def _close_serial(self):
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"""
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Close the serial connection if it's currently open.
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"""
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if self.serial:
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try:
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self.serial.close()
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self.serial = None
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except Exception as e:
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self.logger.warning('Error while closing serial communication: {}')
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self.logger.warning('Error while closing serial communication: %s', e)
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self.logger.exception(e)
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@action
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def get_measurement(self, device=None, baud_rate=None):
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self.serial = None
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def _get_device_and_baud_rate(
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self, device: Optional[str] = None, baud_rate: Optional[int] = None
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) -> _DeviceAndRate:
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"""
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Reads JSON data from the serial device and returns it as a message
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Gets the device path and baud rate from the given device and baud rate
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if set, or it falls back on the default configured ones.
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:param device: Device path (default: default configured device)
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:type device: str
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:param baud_rate: Baud rate (default: default configured baud_rate)
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:type baud_rate: int
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:raise AssertionError: If neither ``device`` nor ``baud_rate`` is set
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nor configured.
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"""
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if not device:
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if not self.device:
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raise RuntimeError('No device specified nor default device configured')
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assert (
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self.device
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), 'No device specified and a default one is not configured'
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device = self.device
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if baud_rate is None:
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if self.baud_rate is None:
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raise RuntimeError('No baud_rate specified nor default configured')
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assert (
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self.baud_rate is not None
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), 'No baud_rate specified nor a default value is configured'
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baud_rate = self.baud_rate
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return _DeviceAndRate(device, baud_rate)
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@override
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@action
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def status(
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self,
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*_,
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device: Optional[str] = None,
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baud_rate: Optional[int] = None,
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publish_entities: bool = True,
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**__,
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) -> dict:
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"""
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Reads JSON data from the serial device and returns it as a message
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:param device: Device path (default: default configured device).
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:param baud_rate: Baud rate (default: default configured baud_rate).
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:param publish_entities: Whether to publish an event with the newly
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read values (default: True).
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"""
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device, baud_rate = self._get_device_and_baud_rate(device, baud_rate)
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data = None
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try:
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serial_available = self.serial_lock.acquire(timeout=2)
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with get_lock(self.serial_lock, timeout=self._timeout) as serial_available:
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if serial_available:
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try:
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ser = self._get_serial(device=device, baud_rate=baud_rate)
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except Exception as e:
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self.logger.debug(e)
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time.sleep(1)
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ser = self._get_serial(device=device, baud_rate=baud_rate, reset=True)
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ser = self._get_serial(device=device, baud_rate=baud_rate)
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data = self._read_json(ser)
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try:
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data = json.loads(data)
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except (ValueError, TypeError):
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self.logger.warning('Invalid JSON message from {}: {}'.format(self.device, data))
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data = dict(json.loads(data))
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except (ValueError, TypeError) as e:
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raise AssertionError(
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f'Invalid JSON message from {device}: {e}. Message: {data}'
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) from e
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else:
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data = self.last_measurement
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finally:
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try:
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self.serial_lock.release()
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except Exception as e:
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self.logger.debug(e)
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data = self.last_data
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if data:
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self.last_measurement = data
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self.last_data = data
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if publish_entities:
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self.publish_entities(self.last_data.items())
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return data
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@action
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def read(self, device=None, baud_rate=None, size=None, end=None):
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def get_measurement(
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self, device: Optional[str] = None, baud_rate: Optional[int] = None
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):
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"""
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(Deprecated) alias for :meth:`.status`.
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"""
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return self.status(device, baud_rate)
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@action
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def read(
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self,
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device: Optional[str] = None,
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baud_rate: Optional[int] = None,
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size: Optional[int] = None,
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end: Optional[Union[int, str]] = None,
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) -> str:
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"""
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Reads raw data from the serial device
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:param device: Device to read (default: default configured device)
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:type device: str
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:param baud_rate: Baud rate (default: default configured baud_rate)
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:type baud_rate: int
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:param size: Number of bytes to read
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:type size: int
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:param end: End of message byte or character
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:type end: int, bytes or str
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:param end: End of message, as a character or bytecode
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:return: The read message as a string if it's a valid UTF-8 string,
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otherwise as a base64-encoded string.
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"""
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if not device:
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if not self.device:
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raise RuntimeError('No device specified nor default device configured')
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device = self.device
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device, baud_rate = self._get_device_and_baud_rate(device, baud_rate)
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assert not (
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(size is None and end is None) or (size is not None and end is not None)
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), 'Either size or end must be specified'
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if baud_rate is None:
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if self.baud_rate is None:
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raise RuntimeError('No baud_rate specified nor default configured')
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baud_rate = self.baud_rate
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if (size is None and end is None) or (size is not None and end is not None):
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raise RuntimeError('Either size or end must be specified')
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if end and isinstance(end, str) and len(end) > 1:
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raise RuntimeError('The serial end must be a single character, not a string')
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assert not (
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end and isinstance(end, str) and len(end) > 1
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), 'The serial end must be a single character, not a string'
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data = bytes()
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try:
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serial_available = self.serial_lock.acquire(timeout=2)
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if serial_available:
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try:
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ser = self._get_serial(device=device, baud_rate=baud_rate)
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except Exception as e:
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self.logger.debug(e)
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time.sleep(1)
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ser = self._get_serial(device=device, baud_rate=baud_rate, reset=True)
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with get_lock(self.serial_lock, timeout=self._timeout) as serial_available:
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assert serial_available, 'Serial read timed out'
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if size is not None:
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for _ in range(0, size):
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data += ser.read()
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elif end is not None:
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if isinstance(end, str):
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end = end.encode()
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ser = self._get_serial(device=device, baud_rate=baud_rate)
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if size is not None:
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for _ in range(0, size):
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data += ser.read()
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elif end is not None:
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end_byte = end.encode() if isinstance(end, str) else bytes([end])
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ch = None
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ch = None
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while ch != end:
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ch = ser.read()
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if ch != end:
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data += ch
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else:
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self.logger.warning('Serial read timeout')
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finally:
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try:
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self.serial_lock.release()
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except Exception as e:
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self.logger.debug(e)
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while ch != end_byte:
|
||||
ch = ser.read()
|
||||
if ch != end:
|
||||
data += ch
|
||||
|
||||
try:
|
||||
data = data.decode()
|
||||
data = data.decode('utf-8')
|
||||
except (ValueError, TypeError):
|
||||
data = base64.encodebytes(data)
|
||||
data = base64.b64encode(data).decode()
|
||||
|
||||
return data
|
||||
|
||||
@action
|
||||
def write(self, data, device=None, baud_rate=None):
|
||||
def write(
|
||||
self,
|
||||
data: Union[str, dict, list, bytes, bytearray],
|
||||
device: Optional[str] = None,
|
||||
baud_rate: Optional[int] = None,
|
||||
binary: bool = False,
|
||||
):
|
||||
"""
|
||||
Writes data to the serial device.
|
||||
|
||||
:param device: Device to write (default: default configured device)
|
||||
:type device: str
|
||||
:param device: Device to write (default: default configured device).
|
||||
:param baud_rate: Baud rate (default: default configured baud_rate).
|
||||
:param data: Data to send to the serial device. It can be any of the following:
|
||||
|
||||
:param baud_rate: Baud rate (default: default configured baud_rate)
|
||||
:type baud_rate: int
|
||||
- A UTF-8 string
|
||||
- A base64-encoded string (if ``binary=True``)
|
||||
- A dictionary/list that will be encoded as JSON
|
||||
- A bytes/bytearray sequence
|
||||
|
||||
:param data: Data to send to the serial device
|
||||
:type data: str, bytes or dict. If dict, it will be serialized as JSON.
|
||||
:param binary: If ``True``, then the message is either a
|
||||
bytes/bytearray sequence or a base64-encoded string.
|
||||
"""
|
||||
|
||||
if not device:
|
||||
if not self.device:
|
||||
raise RuntimeError('No device specified nor default device configured')
|
||||
device = self.device
|
||||
|
||||
if baud_rate is None:
|
||||
if self.baud_rate is None:
|
||||
raise RuntimeError('No baud_rate specified nor default configured')
|
||||
baud_rate = self.baud_rate
|
||||
|
||||
if isinstance(data, dict):
|
||||
device, baud_rate = self._get_device_and_baud_rate(device, baud_rate)
|
||||
if isinstance(data, (dict, list)):
|
||||
data = json.dumps(data)
|
||||
if isinstance(data, str):
|
||||
data = data.encode('utf-8')
|
||||
data = base64.b64decode(data) if binary else data.encode('utf-8')
|
||||
|
||||
try:
|
||||
serial_available = self.serial_lock.acquire(timeout=2)
|
||||
if serial_available:
|
||||
try:
|
||||
ser = self._get_serial(device=device, baud_rate=baud_rate)
|
||||
except Exception as e:
|
||||
self.logger.debug(e)
|
||||
time.sleep(1)
|
||||
ser = self._get_serial(device=device, baud_rate=baud_rate, reset=True)
|
||||
data = bytes(data)
|
||||
with get_lock(self.serial_lock, timeout=self._timeout) as serial_available:
|
||||
assert serial_available, 'Could not acquire the device lock'
|
||||
ser = self._get_serial(device=device, baud_rate=baud_rate)
|
||||
self.logger.info('Writing %d bytes to %s', len(data), device)
|
||||
ser.write(data)
|
||||
|
||||
self.logger.info('Writing {} to {}'.format(data, self.device))
|
||||
ser.write(data)
|
||||
finally:
|
||||
@override
|
||||
def transform_entities(self, entities: Tuple[str, Any]) -> List[Device]:
|
||||
transformed_entities = []
|
||||
|
||||
for k, v in entities:
|
||||
sensor_id = f'serial:{k}'
|
||||
try:
|
||||
self.serial_lock.release()
|
||||
value = float(v)
|
||||
entity_type = NumericSensor
|
||||
except (TypeError, ValueError):
|
||||
value = v
|
||||
entity_type = RawSensor
|
||||
|
||||
transformed_entities.append(
|
||||
entity_type(
|
||||
id=sensor_id,
|
||||
name=k,
|
||||
value=value,
|
||||
)
|
||||
)
|
||||
|
||||
return [
|
||||
Device(
|
||||
id='serial',
|
||||
name=self.device,
|
||||
children=transformed_entities,
|
||||
)
|
||||
]
|
||||
|
||||
@override
|
||||
def publish_entities(self, entities: Collection[Tuple[str, Any]], *_, **__):
|
||||
ret = super().publish_entities(entities)
|
||||
get_bus().post(
|
||||
SensorDataChangeEvent(
|
||||
data=dict(entities),
|
||||
source=get_plugin_name_by_class(self.__class__),
|
||||
)
|
||||
)
|
||||
|
||||
return ret
|
||||
|
||||
@override
|
||||
def main(self):
|
||||
if not self._enable_polling:
|
||||
# If the polling is disabled, we don't need to do anything here
|
||||
self.wait_stop()
|
||||
return
|
||||
|
||||
while not self.should_stop():
|
||||
last_data = self.last_data.copy()
|
||||
try:
|
||||
new_data: dict = self.status(publish_entities=False).output # type: ignore
|
||||
except Exception as e:
|
||||
self.logger.debug(e)
|
||||
self.logger.warning('Could not update the status: %s', e)
|
||||
self.wait_stop(1)
|
||||
continue
|
||||
|
||||
updated_entries = {
|
||||
k: v for k, v in new_data.items() if v != last_data.get(k)
|
||||
}
|
||||
|
||||
self.publish_entities(updated_entries.items())
|
||||
self.last_data = {
|
||||
**last_data,
|
||||
**new_data,
|
||||
}
|
||||
|
||||
@override
|
||||
def stop(self):
|
||||
super().stop()
|
||||
self._close_serial()
|
||||
|
||||
|
||||
# vim:sw=4:ts=4:et:
|
||||
|
|
|
|||
|
|
@ -1,6 +1,8 @@
|
|||
manifest:
|
||||
events: {}
|
||||
events:
|
||||
- platypush.message.event.sensor.SensorDataChangeEvent:
|
||||
install:
|
||||
pip: []
|
||||
pip:
|
||||
- pyserial
|
||||
package: platypush.plugins.serial
|
||||
type: plugin
|
||||
|
|
|
|||
|
|
@ -5,6 +5,7 @@ import hashlib
|
|||
import importlib
|
||||
import inspect
|
||||
import logging
|
||||
from multiprocessing import Lock as PLock
|
||||
import os
|
||||
import pathlib
|
||||
import re
|
||||
|
|
@ -12,13 +13,15 @@ import signal
|
|||
import socket
|
||||
import ssl
|
||||
import urllib.request
|
||||
from typing import Optional, Tuple, Union
|
||||
from threading import Lock as TLock
|
||||
from typing import Generator, Optional, Tuple, Union
|
||||
|
||||
from dateutil import parser, tz
|
||||
from redis import Redis
|
||||
from rsa.key import PublicKey, PrivateKey, newkeys
|
||||
|
||||
logger = logging.getLogger('utils')
|
||||
Lock = Union[PLock, TLock] # type: ignore
|
||||
|
||||
|
||||
def get_module_and_method_from_action(action):
|
||||
|
|
@ -363,7 +366,7 @@ def get_mime_type(resource: str) -> Optional[str]:
|
|||
return response.info().get_content_type()
|
||||
else:
|
||||
if hasattr(magic, 'detect_from_filename'):
|
||||
mime = magic.detect_from_filename(resource)
|
||||
mime = magic.detect_from_filename(resource) # type: ignore
|
||||
elif hasattr(magic, 'from_file'):
|
||||
mime = magic.from_file(resource, mime=True)
|
||||
else:
|
||||
|
|
@ -372,7 +375,7 @@ def get_mime_type(resource: str) -> Optional[str]:
|
|||
)
|
||||
|
||||
if mime:
|
||||
return mime.mime_type if hasattr(mime, 'mime_type') else mime
|
||||
return mime.mime_type if hasattr(mime, 'mime_type') else mime # type: ignore
|
||||
|
||||
return None
|
||||
|
||||
|
|
@ -559,4 +562,27 @@ def to_datetime(t: Union[str, int, float, datetime.datetime]) -> datetime.dateti
|
|||
return t
|
||||
|
||||
|
||||
@contextlib.contextmanager
|
||||
def get_lock(
|
||||
lock: Lock, timeout: Optional[float] = None
|
||||
) -> Generator[bool, None, None]:
|
||||
"""
|
||||
Get a lock with an optional timeout through a context manager construct:
|
||||
|
||||
>>> from threading import Lock
|
||||
>>> lock = Lock()
|
||||
>>> with get_lock(lock, timeout=2):
|
||||
>>> ...
|
||||
|
||||
"""
|
||||
kwargs = {'timeout': timeout} if timeout else {}
|
||||
result = lock.acquire(**kwargs)
|
||||
|
||||
try:
|
||||
yield result
|
||||
finally:
|
||||
if result:
|
||||
lock.release()
|
||||
|
||||
|
||||
# vim:sw=4:ts=4:et:
|
||||
|
|
|
|||
Loading…
Reference in New Issue