87 lines
2.5 KiB
Python
87 lines
2.5 KiB
Python
"""Validate Modbus configuration."""
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import logging
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import struct
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from voluptuous import Invalid
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from homeassistant.const import CONF_COUNT, CONF_NAME, CONF_STRUCTURE
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from .const import (
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CONF_DATA_TYPE,
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CONF_REVERSE_ORDER,
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CONF_SWAP,
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CONF_SWAP_BYTE,
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CONF_SWAP_NONE,
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CONF_SWAP_WORD,
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DATA_TYPE_CUSTOM,
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DATA_TYPE_STRING,
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DEFAULT_STRUCT_FORMAT,
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)
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_LOGGER = logging.getLogger(__name__)
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def sensor_schema_validator(config):
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"""Sensor schema validator."""
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if config[CONF_DATA_TYPE] == DATA_TYPE_STRING:
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structure = str(config[CONF_COUNT] * 2) + "s"
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elif config[CONF_DATA_TYPE] != DATA_TYPE_CUSTOM:
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try:
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structure = (
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f">{DEFAULT_STRUCT_FORMAT[config[CONF_DATA_TYPE]][config[CONF_COUNT]]}"
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)
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except KeyError:
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raise Invalid(
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f"Unable to detect data type for {config[CONF_NAME]} sensor, try a custom type"
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) from KeyError
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else:
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structure = config.get(CONF_STRUCTURE)
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if not structure:
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raise Invalid(
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f"Error in sensor {config[CONF_NAME]}. The `{CONF_STRUCTURE}` field can not be empty "
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f"if the parameter `{CONF_DATA_TYPE}` is set to the `{DATA_TYPE_CUSTOM}`"
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)
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try:
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size = struct.calcsize(structure)
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except struct.error as err:
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raise Invalid(
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f"Error in sensor {config[CONF_NAME]} structure: {str(err)}"
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) from err
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bytecount = config[CONF_COUNT] * 2
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if bytecount != size:
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raise Invalid(
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f"Structure request {size} bytes, "
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f"but {config[CONF_COUNT]} registers have a size of {bytecount} bytes"
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)
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swap_type = config.get(CONF_SWAP)
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if CONF_REVERSE_ORDER in config:
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if config[CONF_REVERSE_ORDER]:
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swap_type = CONF_SWAP_WORD
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else:
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swap_type = CONF_SWAP_NONE
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del config[CONF_REVERSE_ORDER]
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if config.get(CONF_SWAP) != CONF_SWAP_NONE:
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if swap_type == CONF_SWAP_BYTE:
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regs_needed = 1
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else: # CONF_SWAP_WORD_BYTE, CONF_SWAP_WORD
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regs_needed = 2
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if config[CONF_COUNT] < regs_needed or (config[CONF_COUNT] % regs_needed) != 0:
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raise Invalid(
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f"Error in sensor {config[CONF_NAME]} swap({swap_type}) "
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f"not possible due to the registers "
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f"count: {config[CONF_COUNT]}, needed: {regs_needed}"
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)
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return {
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**config,
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CONF_STRUCTURE: structure,
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CONF_SWAP: swap_type,
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}
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