mirror of
https://github.com/kuhyx/steam-backlog-enforcer.git
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Krzysztof kuhy Rudnicki
341bc784ac
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
106 lines
3.9 KiB
Python
106 lines
3.9 KiB
Python
"""The web API's error type and how every lower-level error maps onto it.
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Every refusal leaves the server as ``{"error": "<code>", "message": "…"}``
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with the status below (``DOCS-web-control-api.md``, "Endpoints"). The job
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store raises :class:`~steam_backlog_enforcer.jobs._errors.JobError` and the
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daemon client raises :class:`~steam_backlog_enforcer._ctl_protocol.CtlError`
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/ ``DaemonUnreachableError``; the converters here are the only place their codes
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become HTTP statuses, so one code always means one status.
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"""
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from __future__ import annotations
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from http import HTTPStatus
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import math
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from typing import TYPE_CHECKING, Final
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if TYPE_CHECKING:
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from steam_backlog_enforcer._ctl_protocol import CtlError
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from steam_backlog_enforcer.jobs._errors import JobError
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STATUS_BY_CODE: Final[dict[str, HTTPStatus]] = {
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"bad_token": HTTPStatus.FORBIDDEN,
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"bad_origin": HTTPStatus.FORBIDDEN,
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"bad_host": HTTPStatus.FORBIDDEN,
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"unknown_command": HTTPStatus.BAD_REQUEST,
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"invalid_params": HTTPStatus.BAD_REQUEST,
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"wrong_phrase": HTTPStatus.BAD_REQUEST,
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"not_found": HTTPStatus.NOT_FOUND,
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"locked": HTTPStatus.CONFLICT,
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"busy": HTTPStatus.CONFLICT,
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"countdown_running": HTTPStatus.CONFLICT,
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"not_cancellable": HTTPStatus.CONFLICT,
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"pending_lapsed": HTTPStatus.GONE,
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"rate_limited": HTTPStatus.TOO_MANY_REQUESTS,
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"daemon_unreachable": HTTPStatus.SERVICE_UNAVAILABLE,
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"server_stale": HTTPStatus.SERVICE_UNAVAILABLE,
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"op_failed": HTTPStatus.BAD_GATEWAY,
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"unsupported": HTTPStatus.NOT_IMPLEMENTED,
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}
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class ApiError(Exception):
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"""A request the server answers with a contract error body.
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Attributes:
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code: The contract's ``ApiErrorCode``.
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message: Human text for the body.
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status: HTTP status (defaults to the code's entry in the table).
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retry_after: Seconds the client should wait (``Retry-After``), if any.
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"""
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def __init__(
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self,
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message: str,
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*,
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code: str,
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status: HTTPStatus | None = None,
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retry_after: float | None = None,
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) -> None:
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"""Store the code, message, status and optional retry delay."""
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super().__init__(f"{code}: {message}")
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self.code = code
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self.message = message
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self.status = status or STATUS_BY_CODE.get(code, HTTPStatus.BAD_GATEWAY)
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self.retry_after = retry_after
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def body(self) -> dict[str, object]:
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"""The JSON object sent to the client."""
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out: dict[str, object] = {"error": self.code, "message": self.message}
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if self.retry_after is not None:
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out["retry_after_seconds"] = self.retry_after
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return out
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def headers(self) -> dict[str, str]:
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"""Extra response headers (``Retry-After`` when a delay is known)."""
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if self.retry_after is None:
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return {}
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return {"Retry-After": str(max(1, math.ceil(self.retry_after)))}
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def not_found(message: str) -> ApiError:
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"""A ``not_found`` 404 for an unknown job, backup or endpoint."""
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return ApiError(message, code="not_found")
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def from_job_error(exc: JobError) -> ApiError:
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"""Convert a job-store refusal (an unknown job id is ``not_found``)."""
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return ApiError(exc.message, code=exc.code)
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def from_ctl_error(exc: CtlError) -> ApiError:
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"""Convert a daemon refusal; codes the contract lacks become ``op_failed``."""
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code = exc.code if exc.code in STATUS_BY_CODE else "op_failed"
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retry = exc.data.get("retry_after_seconds") if exc.data else None
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return ApiError(
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exc.message or exc.code,
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code=code,
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retry_after=float(retry) if isinstance(retry, int | float) else None,
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)
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def daemon_unreachable(detail: str) -> ApiError:
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"""The 503 for a daemon that did not answer on its socket."""
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msg = f"The enforcer daemon is not answering on its control socket ({detail})."
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return ApiError(msg, code="daemon_unreachable")
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