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Fix ithmb append mode: preserve existing data across transfer sessions

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- Change ithmb file open from 'wb' (truncate) to 'ab' (append)
- Compute write offset from actual file position via seek(0,2)
- Prevents losing all previous artwork data on each transfer
This commit is contained in:
Maksim Totmin 2026-05-31 18:17:03 +07:00
parent 803f0c4d9a
commit 7d371e2fbf
1 changed files with 12 additions and 6 deletions
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18
src/artwork/writer.py
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@ -116,18 +116,24 @@ def write_artworkdb(
state["index"] += 1
state["offset"] = 0
filename = _ithmb_filename(fmt_id, state["index"])
ithmb_files[fmt_id] = open(os.path.join(artwork_dir, filename), "wb")
ithmb_files[fmt_id] = open(os.path.join(artwork_dir, filename), "ab")
def _write_payload(fmt_id: int, data: bytes) -> IthmbLocation:
state = ithmb_state[fmt_id]
if fmt_id not in ithmb_files:
_open_next(fmt_id)
elif state["offset"] > 0 and state["offset"] + len(data) > ITHMB_MAX_SIZE_BYTES:
_open_next(fmt_id)
else:
f = ithmb_files[fmt_id]
f.seek(0, 2)
cur_size = f.tell()
if cur_size > 0 and cur_size + len(data) > ITHMB_MAX_SIZE_BYTES:
_open_next(fmt_id)
f = ithmb_files[fmt_id]
f.seek(0, 2)
offset = f.tell()
f.write(data)
state["offset"] = offset + len(data)
filename = _ithmb_filename(fmt_id, state["index"])
offset = state["offset"]
ithmb_files[fmt_id].write(data)
state["offset"] += len(data)
return IthmbLocation(filename, offset)
try: