47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
"""
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Custom exceptions for laser control module.
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Provides a hierarchy of exceptions for different error conditions
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that may occur during laser control operations.
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"""
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class LaserControlError(Exception):
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"""Base exception for all laser control errors."""
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pass
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class ValidationError(LaserControlError):
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"""Base exception for validation errors."""
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pass
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class CommunicationError(LaserControlError):
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"""Base exception for communication errors."""
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pass
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class PortBusyError(CommunicationError):
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"""Raised when the serial port is already held by another program.
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A laser controller is a single half-duplex request/response bus: only one
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process may own it at a time. When the port is opened exclusively
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(``exclusive=True``), a second exclusive open fails with this error instead
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of silently sharing the bus and corrupting both sides' traffic.
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"""
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def __init__(self, port: str | None = None):
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target = f"'{port}'" if port else "the laser controller port"
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super().__init__(
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f"Serial port {target} is busy — another program is already using "
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f"the laser controller. Close it first (only one program may own the "
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f"port at a time)."
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)
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class ProtocolError(CommunicationError):
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"""Exception raised for protocol-level errors."""
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def __init__(self, message: str):
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super().__init__(f"Protocol error: {message}")
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