mirror of https://github.com/home-assistant/core
90 lines
2.7 KiB
Python
90 lines
2.7 KiB
Python
"""Support for sensor value(s) stored in local files."""
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from __future__ import annotations
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import logging
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import os
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from file_read_backwards import FileReadBackwards
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from homeassistant.components.sensor import SensorEntity
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from homeassistant.config_entries import ConfigEntry
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from homeassistant.const import (
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CONF_FILE_PATH,
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CONF_NAME,
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CONF_UNIT_OF_MEASUREMENT,
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CONF_VALUE_TEMPLATE,
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)
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from homeassistant.core import HomeAssistant
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from homeassistant.helpers.entity_platform import AddEntitiesCallback
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from homeassistant.helpers.template import Template
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from .const import DEFAULT_NAME, FILE_ICON
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_LOGGER = logging.getLogger(__name__)
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async def async_setup_entry(
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hass: HomeAssistant,
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entry: ConfigEntry,
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async_add_entities: AddEntitiesCallback,
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) -> None:
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"""Set up the file sensor."""
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config = dict(entry.data)
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options = dict(entry.options)
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file_path: str = config[CONF_FILE_PATH]
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unique_id: str = entry.entry_id
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name: str = config.get(CONF_NAME, DEFAULT_NAME)
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unit: str | None = options.get(CONF_UNIT_OF_MEASUREMENT)
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value_template: Template | None = None
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if CONF_VALUE_TEMPLATE in options:
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value_template = Template(options[CONF_VALUE_TEMPLATE], hass)
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async_add_entities(
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[FileSensor(unique_id, name, file_path, unit, value_template)], True
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)
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class FileSensor(SensorEntity):
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"""Implementation of a file sensor."""
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_attr_icon = FILE_ICON
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def __init__(
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self,
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unique_id: str,
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name: str,
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file_path: str,
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unit_of_measurement: str | None,
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value_template: Template | None,
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) -> None:
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"""Initialize the file sensor."""
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self._attr_name = name
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self._file_path = file_path
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self._attr_native_unit_of_measurement = unit_of_measurement
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self._val_tpl = value_template
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self._attr_unique_id = unique_id
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def update(self) -> None:
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"""Get the latest entry from a file and updates the state."""
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try:
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with FileReadBackwards(self._file_path, encoding="utf-8") as file_data:
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for line in file_data:
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data = line
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break
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data = data.strip()
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except (IndexError, FileNotFoundError, IsADirectoryError, UnboundLocalError):
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_LOGGER.warning(
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"File or data not present at the moment: %s",
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os.path.basename(self._file_path),
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)
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return
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if self._val_tpl is not None:
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self._attr_native_value = (
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self._val_tpl.async_render_with_possible_json_value(data, None)
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)
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else:
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self._attr_native_value = data
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