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backup: Add the version to the FileBackend format

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This commit is contained in:
Christian Decker
2020-04-04 20:10:53 +02:00
parent 8f2eea2840
commit caa5c0a16b
1 changed files with 4 additions and 2 deletions
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6
backup/backup.py
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@@ -128,19 +128,21 @@ class FileBackend(Backend):
def add_change(self, entry: Change) -> bool:
typ = b'\x01' if entry.snapshot is None else b'\x02'
if typ == b'\x01':
payload = b'\x00'.join([t.encode('ASCII') for t in entry.transaction])
payload = b'\x00'.join([t.encode('UTF-8') for t in entry.transaction])
elif typ == b'\x02':
payload = entry.snapshot
length = struct.pack("!I", len(payload))
version = struct.pack("!I", entry.version)
with open(self.url.path, 'ab') as f:
f.seek(self.offsets[0])
f.write(length)
f.write(version)
f.write(typ)
f.write(payload)
self.prev_version, self.offsets[1] = self.version, self.offsets[0]
self.version = entry.version
self.offsets[0] += 5 + len(payload)
self.offsets[0] += 9 + len(payload)
self.write_metadata()
return True