add pydantic models for borg 1.x CLI (borgbackup#8338)

pyproject.toml

@@ -40,6 +40,7 @@ dependencies = [
 llfuse = ["llfuse >= 1.3.8"]
 pyfuse3 = ["pyfuse3 >= 3.1.1"]
 nofuse = []
+pydantic = ["pydantic >= 2.8.2"]
 
 [project.urls]
 "Homepage" = "https://borgbackup.org/"

src/borg/public/cli_api/v1.py

@@ -0,0 +1,169 @@
+"""Pydantic models that can parse borg 1.x's CLI output.
+
+The two top-level models are:
+
+- `BorgLogLine`, which parses any line of borg's logging output,
+- all `Borg*Result` classes, which parse the final JSON output of some borg commands.
+
+The different types of log lines are defined in the other models.
+"""
+
+import json
+import logging
+import typing
+from datetime import datetime
+from pathlib import Path
+
+import pydantic
+
+_log = logging.getLogger(__name__)
+
+
+class BaseBorgLogLine(pydantic.BaseModel):
+ def get_level(self) -> int:
+ """Get the log level for this line as a `logging` level value.
+
+ If this is a log message with a levelname, use it.
+ Otherwise, progress messages get `DEBUG` level, and other messages get `INFO`.
+ """
+ return logging.DEBUG
+
+
+class ArchiveProgressLogLine(BaseBorgLogLine):
+ original_size: int
+ compressed_size: int
+ deduplicated_size: int
+ nfiles: int
+ path: Path
+ time: float
+
+
+class FinishedArchiveProgress(BaseBorgLogLine):
+ """JSON object printed on stdout when an archive is finished."""
+
+ time: float
+ type: typing.Literal["archive_progress"]
+ finished: bool
+
+
+class ProgressMessage(BaseBorgLogLine):
+ operation: int
+ msgid: typing.Optional[str]
+ finished: bool
+ message: typing.Optional[str]
+ time: float
+
+
+class ProgressPercent(BaseBorgLogLine):
+ operation: int
+ msgid: str | None = pydantic.Field(None)
+ finished: bool
+ message: str | None = pydantic.Field(None)
+ current: float | None = pydantic.Field(None)
+ info: list[str] | None = pydantic.Field(None)
+ total: float | None = pydantic.Field(None)
+ time: float
+
+ @pydantic.model_validator(mode="after")
+ def fields_depending_on_finished(self) -> typing.Self:
+ if self.finished:
+ if self.message is not None:
+ raise ValueError("message must be None if finished is True")
+ if self.current != self.total:
+ raise ValueError("current must be equal to total if finished is True")
+ if self.info is not None:
+ raise ValueError("info must be None if finished is True")
+ if self.total is not None:
+ raise ValueError("total must be None if finished is True")
+ else:
+ if self.message is None:
+ raise ValueError("message must not be None if finished is False")
+ if self.current is None:
+ raise ValueError("current must not be None if finished is False")
+ if self.info is None:
+ raise ValueError("info must not be None if finished is False")
+ if self.total is None:
+ raise ValueError("total must not be None if finished is False")
+ return self
+
+
+class FileStatus(BaseBorgLogLine):
+ status: str
+ path: Path
+
+
+class LogMessage(BaseBorgLogLine):
+ time: float
+ levelname: typing.Literal["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"]
+ name: str
+ message: str
+ msgid: typing.Optional[str]
+
+ def get_level(self) -> int:
+ try:
+ return getattr(logging, self.levelname)
+ except AttributeError:
+ _log.warning(
+ "could not find log level %s, giving the following message WARNING level: %s",
+ self.levelname,
+ json.dumps(self),
+ )
+ return logging.WARNING
+
+
+_BorgLogLinePossibleTypes = (
+ ArchiveProgressLogLine | FinishedArchiveProgress | ProgressMessage | ProgressPercent | FileStatus | LogMessage
+)
+
+
+class BorgLogLine(pydantic.RootModel[_BorgLogLinePossibleTypes]):
+ """A log line from Borg with the `--log-json` argument."""
+
+ def get_level(self) -> int:
+ return self.root.get_level()
+
+
+class _BorgArchive(pydantic.BaseModel):
+ """Basic archive attributes."""
+
+ name: str
+ id: str
+ start: datetime
+
+
+class _BorgArchiveStatistics(pydantic.BaseModel):
+ """Statistics of an archive."""
+
+ original_size: int
+ compressed_size: int
+ deduplicated_size: int
+ nfiles: int
+
+
+class _BorgLimitUsage(pydantic.BaseModel):
+ """Usage of borg limits by an archive."""
+
+ max_archive_size: float
+
+
+class _BorgDetailedArchive(_BorgArchive):
+ """Archive attributes, as printed by `json info` or `json create`."""
+
+ end: datetime
+ duration: float
+ stats: _BorgArchiveStatistics
+ limits: _BorgLimitUsage
+ command_line: typing.List[str]
+ chunker_params: typing.Any | None = None
+
+
+class BorgCreateResult(pydantic.BaseModel):
+ """JSON object printed at the end of `borg create`."""
+
+ archive: _BorgDetailedArchive
+
+
+class BorgListResult(pydantic.BaseModel):
+ """JSON object printed at the end of `borg list`."""
+
+ archives: typing.List[_BorgArchive]