Closed Exception when the `SqliteDatabase.close` is invoked

[rkistner]

Discussed in #33

^{Originally posted by szk2s March 20, 2024}
Hi there. Thanks for the great library. I'm using this library in my project.

Do you have any suggestions for addressing this ClosedException issue? It appears to occur when the close method of SqliteDatabase is invoked. In my code, I ensure the close method is called only once, leading me to believe the database isn't already closed at the time of this method call.

I’ve not been able to make a minimum reproducible example yet.

[2024-03-20T16:14:08.240792] Instance of 'ClosedException'
#0      ParentPortClient.post (package:sqlite_async/src/port_channel.dart:77:7)
#1      _TransactionContext.close (package:sqlite_async/src/sqlite_connection_impl.dart:230:21)
#2      SqliteConnectionImpl.readLock.<anonymous closure> (package:sqlite_async/src/sqlite_connection_impl.dart:118:19)
<asynchronous suspension>
#3      SimpleMutex.lock.<anonymous closure> (package:sqlite_async/src/mutex.dart:71:16)
<asynchronous suspension>
#4      SqliteConnectionPool.readLock.<anonymous closure>.<anonymous closure> (package:sqlite_async/src/connection_pool.dart:75:18)
<asynchronous suspension>
#5      new Stream.fromFutures.onValue (dart:async/stream.dart:300:5)
<asynchronous suspension>

[2024-03-20T16:14:08.292781] Instance of 'ClosedException'
#0      ParentPortClient.post (package:sqlite_async/src/port_channel.dart:77:7)
#1      _TransactionContext.close (package:sqlite_async/src/sqlite_connection_impl.dart:230:21)
#2      SqliteConnectionImpl.readLock.<anonymous closure> (package:sqlite_async/src/sqlite_connection_impl.dart:118:19)
<asynchronous suspension>
#3      SimpleMutex.lock.<anonymous closure> (package:sqlite_async/src/mutex.dart:71:16)
<asynchronous suspension>
#4      SqliteConnectionPool.readLock.<anonymous closure>.<anonymous closure> (package:sqlite_async/src/connection_pool.dart:75:18)
<asynchronous suspension>
#5      new Stream.fromFutures.onValue (dart:async/stream.dart:300:5)
<asynchronous suspension>

Concurrent modification during iteration: Instance(length:1) of '_GrowableList'.
dart:_internal                                        ListIterator.moveNext
package:sqlite_async/src/connection_pool.dart 186:28  SqliteConnectionPool.close
===== asynchronous gap ===========================
dart:async                                            _CustomZone.registerBinaryCallback
test/utils.dart 89:9     

If I add the following line before the close method call, I can avoid these errors.

   await Future<void>.delayed(Duration(milliseconds: 1000));

But this seems to be a flaky workaround, and I'm looking for a more reliable fix.

I appreciate any help. Thanks.