write method
Create-only initial persist (fresh onboard); implementations throw if the target already exists. Use flush to persist later mutations.
Implementation
@override
Future write(String atsign, AtKeys atKeys) async {
final file = File(filePath!(atsign));
await AtKeysFileLock(file.path).synchronized(() async {
if (file.existsSync()) {
throw AtKeysFileOverwriteException(
'Tried writing ${file.path}, but failed since it already exists');
}
await _writeAtRestDocument(file, await _encodeAtRest(atKeys, atsign));
});
}