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peewee.InterfaceError: (0, '') | pymysql.err.InterfaceError: (0, '') #59

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dikderoy opened this issue Mar 16, 2017 · 15 comments
Open

peewee.InterfaceError: (0, '') | pymysql.err.InterfaceError: (0, '') #59

dikderoy opened this issue Mar 16, 2017 · 15 comments

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@dikderoy
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I am encountering this exception (using high-level api) then my asyncio based daemon is idle (about 15 minutes or so), after that time, this exception occurs, I have tried to close and reopen connection, and was surprised that Manager (high-level api) did not track its state (close/reopen is done using its methods).

after reopening a connection I've got stuck with a bunch of coroutines waiting for resolution which obviously will never come. =(

  1. can it be a bug in pymysql/peewee
  2. propose add connection status tracking to high-level Manager

any thoughts on how to fix that?

Traceback (most recent call last):
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/peewee.py", line 3748, in execute_sql
warehouse_1        |     cursor.execute(sql, params or ())
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/pymysql/cursors.py", line 166, in execute
warehouse_1        |     result = self._query(query)
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/pymysql/cursors.py", line 322, in _query
warehouse_1        |     conn.query(q)
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 851, in query
warehouse_1        |     self._execute_command(COMMAND.COM_QUERY, sql)
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 1067, in _execute_command
warehouse_1        |     raise err.InterfaceError("(0, '')")
warehouse_1        | pymysql.err.InterfaceError: (0, '')
warehouse_1        | 
warehouse_1        | During handling of the above exception, another exception occurred:
warehouse_1        | 
warehouse_1        | Traceback (most recent call last):
warehouse_1        |   File "/opt/app/storage/sql.py", line 357, in _wrapper_catch_db_excetions
warehouse_1        |     return await fn(*args, **kwargs)
warehouse_1        |   File "/opt/app/storage/sql.py", line 415, in update
warehouse_1        |     await self._manager.create(Item2Source, item_id=existing.id, source_id=source.id)
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/peewee_async.py", line 183, in create
warehouse_1        |     pk = inst._get_pk_value()
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/peewee.py", line 5017, in _get_pk_value
warehouse_1        |     return getattr(self, self._meta.primary_key.name)
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/peewee.py", line 1553, in __get__
warehouse_1        |     for field_name in self.field_names])
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/peewee.py", line 1553, in <listcomp>
warehouse_1        |     for field_name in self.field_names])
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/peewee.py", line 1363, in __get__
warehouse_1        |     return self.get_object_or_id(instance)
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/peewee.py", line 1354, in get_object_or_id
warehouse_1        |     obj = self.rel_model.get(self.field.to_field == rel_id)
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/peewee.py", line 4900, in get
warehouse_1        |     return sq.get()
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/peewee.py", line 3161, in get
warehouse_1        |     return next(clone.execute())
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/peewee.py", line 3213, in execute
warehouse_1        |     self._qr = ResultWrapper(model_class, self._execute(), query_meta)
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/peewee.py", line 2892, in _execute
warehouse_1        |     return self.database.execute_sql(sql, params, self.require_commit)
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/peewee_async.py", line 1024, in execute_sql
warehouse_1        |     return super().execute_sql(*args, **kwargs)
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/peewee.py", line 3755, in execute_sql
warehouse_1        |     self.commit()
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/peewee.py", line 3578, in __exit__
warehouse_1        |     reraise(new_type, new_type(*exc_args), traceback)
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/peewee.py", line 135, in reraise
warehouse_1        |     raise value.with_traceback(tb)
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/peewee.py", line 3748, in execute_sql
warehouse_1        |     cursor.execute(sql, params or ())
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/pymysql/cursors.py", line 166, in execute
warehouse_1        |     result = self._query(query)
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/pymysql/cursors.py", line 322, in _query
warehouse_1        |     conn.query(q)
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 851, in query
warehouse_1        |     self._execute_command(COMMAND.COM_QUERY, sql)
warehouse_1        |   File "/usr/local/lib/python3.5/site-packages/pymysql/connections.py", line 1067, in _execute_command
warehouse_1        |     raise err.InterfaceError("(0, '')")
warehouse_1        | peewee.InterfaceError: (0, '')
@dikderoy
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dikderoy commented Mar 16, 2017 •
edited

according to this tread: http://stackoverflow.com/questions/6650940/interfaceerror-0
this is related to unreleased cursors somehow.

here I must mention what I use Manager.atomic() context manager, maybe there is a problem in releasing cursors due to following statement:

    @asyncio.coroutine
    def cursor(self, conn=None, *args, **kwargs):
        """Get cursor for connection from pool.
        """
        in_transaction = conn is not None
        if not conn:
            conn = yield from self.acquire()
        cursor = yield from conn.cursor(*args, **kwargs)
        # NOTE: `cursor.release` is an awaitable object!
        cursor.release = self.release_cursor(
            cursor, in_transaction=in_transaction)
        return cursor

    @asyncio.coroutine
    def release_cursor(self, cursor, in_transaction=False):
        """Release cursor coroutine. Unless in transaction,
        the connection is also released back to the pool.
        """
        conn = cursor.connection
        yield from cursor.close()
        if not in_transaction:
            self.release(conn)

do context manager releases cursors after exiting a transaction?

@rudyryk
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rudyryk commented Mar 16, 2017

Hello @dikderoy! Could you provide complete code snippet to reproduce the issue?

here I must mention what I use Manager.atomic() context manager

Transactions in async mode is a kind of tricky thing. Usually in blocking mode connection for transaction is saved into thread locals so it can't interfere with other connections from other threads / transactions.

Is sync mode we can't use thread locals, so we're using per-task context. That means, each transactions should run within separate async task. So, I'm not sure, It may be some edge case.

@dikderoy
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it occurs on this code (quite tricky, nested coroutines and several atomics())

    async def update(self, entity: DomainItem, existing: Item = None) -> bool:
        async with self._manager.atomic() as trx:
            existing = existing or False
            if not existing:
                candidates = await self._manager.prefetch(
                    Item.select().where(Item.id == entity.cid),
                    Item2Source.select().where(Item2Source.item_id == entity.cid)
                )
                for one in candidates:  # type: Item
                    if one.id == entity.cid:
                        existing = one  # type: Item
                        break

            if existing:  # type: Item
                # check instance version matches (optimistic lock)
                if not existing.version == entity.data.version:
                    raise VersionMismatch()
                entity.data.version += 1
                # update peewee instance with data from domain instance (sync)
                DomainEncoder.item_update_instance(existing, entity)
                await self._manager.update(existing)
                # merging source references
                # nested atomic in same context
                async with self._manager.atomic():
                    if entity.meta.sid not in [ref.source_id for ref in existing.item2source_set_prefetch]:
                        source = await self._manager.get(Source, Source.id == entity.meta.sid)  # type: Source
                        await self._manager.create(Item2Source, item_id=existing.id, source_id=source.id)
                return True
            return False

    async def save(self, entity: DomainItem) -> bool:
        async with self._manager.atomic() as trx:
            try:
                existing = False
                presaved = await self._manager.prefetch(
                    Item.select().where(Item.id == entity.cid),
                    Item2Source.select().where(Item2Source.item_id == entity.cid)
                )

                for one in presaved:  # type: Item
                    if one.id == entity.cid:
                        existing = one
                        break

                if existing:
                    return await self.update(entity, existing)  # coro with nested atomic context
                else:
                    db_model = await self._manager.create(Item, **DomainEncoder.item_encode_dict(entity))
                    await trx.commit()  # needed to get ID (or am I doing something wrong?)
                    entity.cid = db_model.id
                    db_rel = await self._manager.create(Item2Source, source_id=entity.meta.sid, item_id=db_model.id)
                    await trx.commit()   # needed to get ID (or am I doing something wrong?)
                    entity.meta.sid = db_rel.source_id

                    if len(entity.data.images) > 0:
                        for image in entity.data.images:
                            await self._manager.create(ItemImage, **DomainEncoder.image_encode_dict(image),
                                                       item_id=db_model.id)

                    return True
            except peewee.PeeweeException as e:
                raise StorageException(e)

later I will try to write an app to reproduce the issue, for now this is a snippet from my project itself as is.
I've commented some parts so You may understand what's going on around... hope it gives you a lead.

@dikderoy
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dikderoy commented Mar 16, 2017 •
edited

according to stacktrace - it appears in case then
update is called from within the create and inside of nested atomic() at this line:

27:  await self._manager.create(Item2Source, item_id=existing.id, source_id=source.id)

at 3rd "level"

@dikderoy
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looks like the issue has nothing to do with atomic stack..

i've refactored my code, removing nested atomics, and make the problematic call with no transaction at all, problem persists..

and after relaunch - it works normally...

@dikderoy
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so far my investigation led me to following:

  • this has something to do with possibly using same connection instance for more than one asyncio.Task
  • problem occurs only after 15-20 minutes in idle state.

I forged a simple app with a unit test which reproduce an issue.

resulting exception is different (not InterfaceError) but I think these two cases are connected.

here is a repo with an app - if you're interested: https://github.com/dikderoy/peewee-async-bug

and here is a trace:

Error
Traceback (most recent call last):
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/peewee.py", line 3748, in execute_sql
    cursor.execute(sql, params or ())
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/pymysql/cursors.py", line 166, in execute
    result = self._query(query)
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/pymysql/cursors.py", line 322, in _query
    conn.query(q)
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/pymysql/connections.py", line 852, in query
    self._affected_rows = self._read_query_result(unbuffered=unbuffered)
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/pymysql/connections.py", line 1053, in _read_query_result
    result.read()
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/pymysql/connections.py", line 1336, in read
    first_packet = self.connection._read_packet()
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/pymysql/connections.py", line 983, in _read_packet
    packet_header = self._read_bytes(4)
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/pymysql/connections.py", line 1029, in _read_bytes
    CR.CR_SERVER_LOST, "Lost connection to MySQL server during query")
pymysql.err.OperationalError: (2013, 'Lost connection to MySQL server during query')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/deroy/PROJECTS/Pets/peewee-async-bug/app/test_item_save_handler.py", line 60, in test_2_fails
    asyncio.get_event_loop().run_until_complete(test())
  File "/usr/lib/python3.5/asyncio/base_events.py", line 387, in run_until_complete
    return future.result()
  File "/usr/lib/python3.5/asyncio/futures.py", line 274, in result
    raise self._exception
  File "/usr/lib/python3.5/asyncio/tasks.py", line 241, in _step
    result = coro.throw(exc)
  File "/home/deroy/PROJECTS/Pets/peewee-async-bug/app/test_item_save_handler.py", line 57, in test
    await t
  File "/usr/lib/python3.5/asyncio/futures.py", line 361, in __iter__
    yield self  # This tells Task to wait for completion.
  File "/usr/lib/python3.5/asyncio/tasks.py", line 296, in _wakeup
    future.result()
  File "/usr/lib/python3.5/asyncio/futures.py", line 274, in result
    raise self._exception
  File "/usr/lib/python3.5/asyncio/tasks.py", line 239, in _step
    result = coro.send(None)
  File "/home/deroy/PROJECTS/Pets/peewee-async-bug/app/test_item_save_handler.py", line 67, in add_record
    item = await irepo.save({'id': identifier, 'sid': 1, 'title': 'i_%s' % identifier})
  File "/home/deroy/PROJECTS/Pets/peewee-async-bug/app/sql.py", line 138, in save
    db_rel = await self._manager.create(Item2Source, source_id=entity['sid'], item=db_model)
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/peewee_async.py", line 183, in create
    pk = inst._get_pk_value()
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/peewee.py", line 5017, in _get_pk_value
    return getattr(self, self._meta.primary_key.name)
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/peewee.py", line 1553, in __get__
    for field_name in self.field_names])
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/peewee.py", line 1553, in <listcomp>
    for field_name in self.field_names])
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/peewee.py", line 1363, in __get__
    return self.get_object_or_id(instance)
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/peewee.py", line 1354, in get_object_or_id
    obj = self.rel_model.get(self.field.to_field == rel_id)
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/peewee.py", line 4900, in get
    return sq.get()
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/peewee.py", line 3161, in get
    return next(clone.execute())
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/peewee.py", line 3213, in execute
    self._qr = ResultWrapper(model_class, self._execute(), query_meta)
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/peewee.py", line 2892, in _execute
    return self.database.execute_sql(sql, params, self.require_commit)
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/peewee_async.py", line 1024, in execute_sql
    return super().execute_sql(*args, **kwargs)
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/peewee.py", line 3755, in execute_sql
    self.commit()
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/peewee.py", line 3578, in __exit__
    reraise(new_type, new_type(*exc_args), traceback)
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/peewee.py", line 135, in reraise
    raise value.with_traceback(tb)
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/peewee.py", line 3748, in execute_sql
    cursor.execute(sql, params or ())
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/pymysql/cursors.py", line 166, in execute
    result = self._query(query)
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/pymysql/cursors.py", line 322, in _query
    conn.query(q)
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/pymysql/connections.py", line 852, in query
    self._affected_rows = self._read_query_result(unbuffered=unbuffered)
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/pymysql/connections.py", line 1053, in _read_query_result
    result.read()
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/pymysql/connections.py", line 1336, in read
    first_packet = self.connection._read_packet()
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/pymysql/connections.py", line 983, in _read_packet
    packet_header = self._read_bytes(4)
  File "/home/deroy/PROJECTS/venv/lib/python3.5/site-packages/pymysql/connections.py", line 1029, in _read_bytes
    CR.CR_SERVER_LOST, "Lost connection to MySQL server during query")
peewee.OperationalError: (2013, 'Lost connection to MySQL server during query')

@rudyryk
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rudyryk commented Mar 28, 2017

Hi @dikderoy!

I've performed a little investigation, here are some thoughts.

  1. I can reproduce the issue just restarting MySQL server during sleep() call, so we don't need to wait 20 minutes, 30 seconds is enough: start tests with python -m app.test_item_save_handler and restart server after add 3rd record message.

  2. The original exception as I can see comes from sync query, peewee.execute_sql() is a sync one. So, the reason of exception is not necessary in async code.

But what bothers me is that sync query is triggered, I think I'll dive into it some time later.

@dikderoy
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my test is designed to show what bug appears in simple, real-world scenario, "crazy-monkey method" to speed up tests - is just a way of getting work done faster =)

Here is another thing which can help to track the cause - in all variations of code and execution graphs - it always fail while working with Item2Source - which is not like other 2 models - it is a many2many table relation (composed of 2 foreignkey fields and having them as composite pk)

I am not familiar with peewee internals but it looks connected.

@pikeas
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pikeas commented Dec 7, 2017

Experiencing the same InterfaceError, any progress on this?

@Xandaros
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Xandaros commented Mar 14, 2018 •
edited

I am also encountering this.
I use flask with socketio, which, as far as I know, uses coroutines or something similar. Maybe it is connected to async, after all?

I am not using anything fancy from peewee - just the high level API. And indeed, it happens after long idle time.

Edit: Looks like I got the wrong repo, I'm actually using normal peewee. This is still an issue for me, though. Maybe this will help you narrow it down.

@aghasi
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aghasi commented Aug 28, 2020

I got same error in combination of asyncio and peewee:

Traceback (most recent call last):
  File "AsyncTgClient.py", line 324, in StartClient
    sim.MarkAsOffline()
  File "../DbManager.py", line 110, in MarkAsOffline
    self.save()
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 6399, in save
    rows = self.update(**field_dict).where(self._pk_expr()).execute()
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 1821, in inner
    return method(self, database, *args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 1892, in execute
    return self._execute(database)
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 2369, in _execute
    cursor = database.execute(self)
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 3034, in execute
    return self.execute_sql(sql, params, commit=commit)
  File "/usr/local/lib/python3.6/dist-packages/playhouse/shortcuts.py", line 215, in execute_sql
    raise exc
  File "/usr/local/lib/python3.6/dist-packages/playhouse/shortcuts.py", line 211, in execute_sql
    return super(ReconnectMixin, self).execute_sql(sql, params, commit)
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 3028, in execute_sql
    self.commit()
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 2796, in __exit__
    reraise(new_type, new_type(*exc_args), traceback)
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 183, in reraise
    raise value.with_traceback(tb)
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 3024, in execute_sql
    self.rollback()
  File "/usr/local/lib/python3.6/dist-packages/peewee.py", line 3175, in rollback
    return self._state.conn.rollback()
  File "/usr/local/lib/python3.6/dist-packages/pymysql/connections.py", line 429, in rollback
    self._execute_command(COMMAND.COM_QUERY, "ROLLBACK")
  File "/usr/local/lib/python3.6/dist-packages/pymysql/connections.py", line 750, in _execute_command
    raise err.InterfaceError("(0, '')")
peewee.InterfaceError: (0, '')

@Sispheor
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Sispheor commented May 5, 2021

Same here. Peewee used in an asyncio method

Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/pymysql/connections.py", line 756, in _write_bytes
    self._sock.sendall(data)
ConnectionResetError: [Errno 104] Connection reset by peer

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 3144, in execute_sql
    cursor.execute(sql, params or ())
  File "/usr/local/lib/python3.8/site-packages/pymysql/cursors.py", line 148, in execute
    result = self._query(query)
  File "/usr/local/lib/python3.8/site-packages/pymysql/cursors.py", line 310, in _query
    conn.query(q)
  File "/usr/local/lib/python3.8/site-packages/pymysql/connections.py", line 547, in query
    self._execute_command(COMMAND.COM_QUERY, sql)
  File "/usr/local/lib/python3.8/site-packages/pymysql/connections.py", line 814, in _execute_command
    self._write_bytes(packet)
  File "/usr/local/lib/python3.8/site-packages/pymysql/connections.py", line 759, in _write_bytes
    raise err.OperationalError(
pymysql.err.OperationalError: (2006, "MySQL server has gone away (ConnectionResetError(104, 'Connection reset by peer'))")

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/discord/client.py", line 343, in _run_event
    await coro(*args, **kwargs)
  File "/app/my_discord_client.py", line 96, in on_member_update
    GameSessionManager.handle_user_update(before, after)
  File "/app/game_session_manager.py", line 47, in handle_user_update
    target_user = cls.get_or_create_user(user_id=after.id, name=after.name)
  File "/app/game_session_manager.py", line 18, in get_or_create_user
    target_user = DiscordUser.get(id=user_id)
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 6438, in get
    return sq.get()
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 6884, in get
    return clone.execute(database)[0]
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 1907, in inner
    return method(self, database, *args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 1978, in execute
    return self._execute(database)
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 2150, in _execute
    cursor = database.execute(self)
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 3157, in execute
    return self.execute_sql(sql, params, commit=commit)
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 3151, in execute_sql
    self.commit()
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 2917, in __exit__
    reraise(new_type, new_type(exc_value, *exc_args), traceback)
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 190, in reraise
    raise value.with_traceback(tb)
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 3144, in execute_sql
    cursor.execute(sql, params or ())
  File "/usr/local/lib/python3.8/site-packages/pymysql/cursors.py", line 148, in execute
    result = self._query(query)
  File "/usr/local/lib/python3.8/site-packages/pymysql/cursors.py", line 310, in _query
    conn.query(q)
  File "/usr/local/lib/python3.8/site-packages/pymysql/connections.py", line 547, in query
    self._execute_command(COMMAND.COM_QUERY, sql)
  File "/usr/local/lib/python3.8/site-packages/pymysql/connections.py", line 814, in _execute_command
    self._write_bytes(packet)
  File "/usr/local/lib/python3.8/site-packages/pymysql/connections.py", line 759, in _write_bytes
    raise err.OperationalError(
peewee.OperationalError: (2006, "MySQL server has gone away (ConnectionResetError(104, 'Connection reset by peer'))")
2021-05-05 11:27:17,088 INFO [User update] name: Doucati, id: 426472859280343060
2021-05-05 11:27:17,088 INFO [Session skipped] User 'Doucati' stopped playing but was not tracked yet
2021-05-05 11:29:23,017 INFO [User update] name: justikiller, id: 237242555308179456
2021-05-05 11:29:23,017 INFO [Stopped playing] user: justikiller
Ignoring exception in on_member_update
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 3144, in execute_sql
    cursor.execute(sql, params or ())
  File "/usr/local/lib/python3.8/site-packages/pymysql/cursors.py", line 148, in execute
    result = self._query(query)
  File "/usr/local/lib/python3.8/site-packages/pymysql/cursors.py", line 310, in _query
    conn.query(q)
  File "/usr/local/lib/python3.8/site-packages/pymysql/connections.py", line 547, in query
    self._execute_command(COMMAND.COM_QUERY, sql)
  File "/usr/local/lib/python3.8/site-packages/pymysql/connections.py", line 793, in _execute_command
    raise err.InterfaceError(0, "")
pymysql.err.InterfaceError: (0, '')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/discord/client.py", line 343, in _run_event
    await coro(*args, **kwargs)
  File "/app/my_discord_client.py", line 96, in on_member_update
    GameSessionManager.handle_user_update(before, after)
  File "/app/game_session_manager.py", line 47, in handle_user_update
    target_user = cls.get_or_create_user(user_id=after.id, name=after.name)
  File "/app/game_session_manager.py", line 18, in get_or_create_user
    target_user = DiscordUser.get(id=user_id)
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 6438, in get
    return sq.get()
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 6884, in get
    return clone.execute(database)[0]
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 1907, in inner
    return method(self, database, *args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 1978, in execute
    return self._execute(database)
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 2150, in _execute
    cursor = database.execute(self)
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 3157, in execute
    return self.execute_sql(sql, params, commit=commit)
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 3151, in execute_sql
    self.commit()
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 2917, in __exit__
    reraise(new_type, new_type(exc_value, *exc_args), traceback)
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 190, in reraise
    raise value.with_traceback(tb)
  File "/usr/local/lib/python3.8/site-packages/peewee.py", line 3144, in execute_sql
    cursor.execute(sql, params or ())
  File "/usr/local/lib/python3.8/site-packages/pymysql/cursors.py", line 148, in execute
    result = self._query(query)
  File "/usr/local/lib/python3.8/site-packages/pymysql/cursors.py", line 310, in _query
    conn.query(q)
  File "/usr/local/lib/python3.8/site-packages/pymysql/connections.py", line 547, in query
    self._execute_command(COMMAND.COM_QUERY, sql)
  File "/usr/local/lib/python3.8/site-packages/pymysql/connections.py", line 793, in _execute_command
    raise err.InterfaceError(0, "")

@rudyryk
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rudyryk commented May 5, 2021

@Sispheor This call is not async, my guess is that sync fallback is used which is not intended:

target_user = DiscordUser.get(id=user_id)

@Sispheor
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Sispheor commented May 5, 2021 •
edited

Yes, sorry. I googled my error and fell here. It's an issue with Peewee.

@stellaye
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stellaye commented May 22, 2022 •
edited

face the same question , when I run my web application with peewee after 8 hours , it throw out" err.InterfaceError(0, "")" error

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@rudyryk @Xandaros @pikeas @aghasi @Sispheor @dikderoy @stellaye