Senko-san
80 lines
1.9 KiB
Python
80 lines
1.9 KiB
Python
"""Domain exception hierarchy — framework-agnostic.
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Services raise these; the API layer maps them to HTTP responses
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(see ``app.api.errors``). The domain never references HTTP status codes.
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"""
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class DomainError(Exception):
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"""Base for all expected, business-meaningful failures.
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``code`` is a stable, machine-readable identifier returned to clients.
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"""
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code: str = "domain_error"
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def __init__(self, message: str | None = None) -> None:
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super().__init__(message or self.__class__.__doc__ or self.code)
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self.message = str(self)
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class NotFoundError(DomainError):
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"""Requested resource does not exist."""
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code = "not_found"
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class AlreadyExistsError(DomainError):
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"""Resource conflicts with an existing one (e.g. duplicate)."""
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code = "already_exists"
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class ConflictError(DomainError):
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"""Operation conflicts with current state (e.g. stale version on write)."""
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code = "conflict"
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class ValidationError(DomainError):
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"""Input is well-formed but violates a business rule."""
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code = "validation_error"
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class AuthenticationError(DomainError):
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"""Caller could not be authenticated."""
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code = "authentication_error"
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class PermissionDeniedError(DomainError):
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"""Caller authenticated but not authorized for this action."""
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code = "permission_denied"
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class DependencyUnavailableError(DomainError):
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"""An external dependency (source, ML, MusicBrainz) is unavailable.
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Callers should degrade gracefully rather than propagate as a hard 500.
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"""
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code = "dependency_unavailable"
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class StorageError(DomainError):
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"""File storage operation failed."""
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code = "storage_error"
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class RangeNotSatisfiableError(DomainError):
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"""Requested byte range cannot be satisfied."""
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code = "range_not_satisfiable"
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def __init__(self, total_size: int) -> None:
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super().__init__("Requested range is not satisfiable.")
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self.total_size = total_size
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