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Use Last-Modified and ETag headers to determine KIT-IPD file versions (#95)

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Co-authored-by: I-Al-Istannen <i-al-istannen@users.noreply.github.com>
This commit is contained in:
Tim
2024-10-27 19:03:47 +01:00
committed by GitHub
parent c54c3bcfa1
commit 739dd95850
4 changed files with 104 additions and 10 deletions
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15
PFERD/output_dir.py
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@ -57,6 +57,7 @@ class OnConflict(Enum):
@dataclass
class Heuristics:
etag_differs: Optional[bool]
mtime: Optional[datetime]
@ -233,8 +234,16 @@ class OutputDirectory:
remote_newer = None
# ETag should be a more reliable indicator than mtime, so we check it first
if heuristics.etag_differs is not None:
remote_newer = heuristics.etag_differs
if remote_newer:
log.explain("Remote file's entity tag differs")
else:
log.explain("Remote file's entity tag is the same")
# Python on Windows crashes when faced with timestamps around the unix epoch
if heuristics.mtime and (os.name != "nt" or heuristics.mtime.year > 1970):
if remote_newer is None and heuristics.mtime and (os.name != "nt" or heuristics.mtime.year > 1970):
mtime = heuristics.mtime
remote_newer = mtime.timestamp() > stat.st_mtime
if remote_newer:
@ -366,6 +375,8 @@ class OutputDirectory:
self,
remote_path: PurePath,
path: PurePath,
*,
etag_differs: Optional[bool] = None,
mtime: Optional[datetime] = None,
redownload: Optional[Redownload] = None,
on_conflict: Optional[OnConflict] = None,
@ -375,7 +386,7 @@ class OutputDirectory:
MarkConflictError.
"""
heuristics = Heuristics(mtime)
heuristics = Heuristics(etag_differs, mtime)
redownload = self._redownload if redownload is None else redownload
on_conflict = self._on_conflict if on_conflict is None else on_conflict
local_path = self.resolve(path)