500 Error At /api/upload

May 1, 2025 by ADMIN 25 views

Introduction

In this article, we will be discussing a 500 error that occurred at the /api/upload endpoint. The error was reported by the logged_out user and was caused by a MySQLdb.OperationalError with the error code 2006, indicating that the server has gone away. We will be analyzing the stack trace and the request data to understand the root cause of the error and provide a solution.

Background

The error occurred when the user attempted to upload a log file to the /api/upload endpoint. The log file contained a match history between two players, Pirula42 and Tesseract112. The match history was recorded in a specific format, with each game being represented by a series of events, including card plays, attacks, and other actions.

Stack Trace

The stack trace indicates that the error occurred in the import_log function, which is responsible for importing the match history from the log file. The error was caused by a MySQLdb.OperationalError with the error code 2006, indicating that the server has gone away.

Traceback (most recent call last):
  File "/penny/decksite/.venv/lib64/python3.10/site-packages/sqlalchemy/engine/base.py", line 1965, in _exec_single_context
    self.dialect.do_execute(
  File "/penny/decksite/.venv/lib64/python3.10/site-packages/sqlalchemy/engine/default.py", line 921, in do_execute
    cursor.execute(statement, parameters)
  File "/penny/decksite/.venv/lib64/python3.10/site-packages/MySQLdb/cursors.py", line 179, in execute
    res = self._query(mogrified_query)
  File "/penny/decksite/.venv/lib64/python3.10/site-packages/MySQLdb/cursors.py", line 330, in _query
    db.query(q)
  File "/penny/decksite/.venv/lib64/python3.10/site-packages/MySQLdb/connections.py", line 261, in query
    _mysql.connection.query(self, query)
MySQLdb.OperationalError: (2006, 'Server has gone away')
[SQL: SELECT `match`.id AS match_id, `match`.format_id AS match_format_id, `match`.comment AS match_comment, `match`.start_time AS match_start_time, `match`.end_time AS match_end_time, `match`.has_unexpected_third_game AS match_has_unexpected_third_game, `match`.is_league AS match_is_league, `match`.is_tournament AS match_is_tournament 
FROM `match` 
WHERE `match`.id = %s]
[parameters: (278110828,)]
(Background on this error at: https://sqlalche.me/e/20/e3q8)

Request Data

The request data indicates that the user attempted to upload a log file with the following data:

{
  "match_id": "278110828",
  "start_time_utc": "1746134270",
  "end_time_utc": "1746135391",
  "lines": "PennyDreadful\r\npd league\r\nBuggedCardObserver, LeagueObserver, PennyDreadfulLegality\r\nPirula42,Tesseract112\r\n\r\n== Game 1 (915307426)\r\n[Time] 1746134270\r\n[00:17:52] PDBot has started watching.\r\n[00:17:52] Pirula42 joined the game.\r\n[League] Burn by pirula42 (262837) vs Stax by tesseract112 (262830)\r\n[00:17:53] [CHAT] PDBot: [sD] Good luck in your League match!\r\n[00:18:01] [CHAT] Tesseract112: hi glhf\r\n[00:18:03] Pirula42 chooses to play first.\r\n[00:18:14] [CHAT] Pirula42: glhf :)\r\n[00:18:19] Pirula42 begins the game with seven cards in hand.\r\n[00:18:20] Tesseract112 begins the game with seven cards in hand.\r\n[00:18:20] Turn 1: Pirula42\r\n[00:18:21] Pirula42 skips their draw step.\r\n[00:18:23] Pirula42 plays [Mountain].\r\n[00:18:25] Pirula42 casts [Bomat Courier].\r\n[00:18:30] Tesseract112 is being attacked by [Bomat Courier]\r\n[00:18:30] Pirula42 puts triggered ability from [Bomat Courier] onto the stack (Whenever this creature attacks, exile the top card of your library face down.).\r\n[00:18:39] Turn 1: Tesseract112\r\n[00:18:44] Tesseract112 plays [Isolated Chapel].\r\n[00:18:48] Turn 2: Pirula42\r\n[00:18:50] Pirula42 plays [Mountain].\r\n[00:18:52] Pirula42 casts [Charming Scoundrel].\r\n[00:18:57] Pirula42 puts triggered ability from [Charming Scoundrel] onto the stack targeting [Charming Scoundrel] (Create a Wicked Role token attached to target creature you control.).\r\n[00:18:58] Pirula42's [Charming Scoundrel] creates a Wicked attached to [Charming Scoundrel].\r\n[00:19:02] Tesseract112 is being attacked by [Charming Scoundrel] and [Bomat Courier]\r\n[00:19:02] Pirula42 puts triggered ability from [Bomat Courier] onto the stack (Whenever this creature attacks, exile the top card of your library face down.).\r\n[00:19:06] Turn 2: Tesseract112\r\n[00:19:15] Tesseract112 plays [Isolated Chapel].\r\n[00:19:17] Tesseract112 casts [Grim Bauble].\r\n[00:19:19] Tesseract112 puts triggered ability from [Grim Bauble] onto the stack targeting [Bomat Courier] (When this artifact enters, target creature an opponent controls gets -2/-2 until end of turn.).\r\n[00:19:24] Turn 3: Pirula42\r\n[00:19:28] Pirula42 casts [Vexing Devil].\r\n[00:19:29] Pirula42 puts triggered ability from [Vexing Devil] onto the stack (When this creature enters, any opponent have it deal 4 damage to them. If a player does, sacri...).\r\n[00:19:40] Pirula42 casts [Chain Lightning] targeting Tesseract112.\r\n[00:19:45] Tesseract112 is being attacked by [Charming Scoundrel]\r\n[00:19:48] Turn 3: Tesseract112\r\n[00:19:51] Tesseract112 plays [Ballroom].\r\n[00:19:56] Tesseract112 casts [Momentum Breaker].\r\n[00:19:56] Tesseract112 puts triggered ability from [Momentum Breaker] onto the stack (When this enchantment enters, each opponent sacrifices a creature or Vehicle of their choice. Each...).\r\n[00:19:58] Pirula42 puts triggered ability from [Wicked] onto the stack (When this Aura is put into a graveyard from the battlefield, each opponent loses 1 life.).\r\n[00:20:03] Turn 4: Pirula42\r\n[00:20:10] Pirula42 casts [Price of Progress].\r\n[00:20:14] [CHAT] Tesseract112: gg\r\n[00:20:16] Pirula42 wins the game.\r\nWinner: Pirula42\r\nGame 1 Completed.\r\n== Game 2 (915307812) ==\r\n[Time] 1746134452\r\n[00:20:53] PDBot has started watching.\r\n[00:20:55] Pirula42 begins the game with seven cards in hand.\r\n[00:20:55] Turn 1: Tesseract112\r\n[00:20:56] Tesseract112 skips their draw step.\r\n[00:20:58] Tesseract112 plays [Swamp].\r\n[00:21:01] Turn 1: Pirula42\r\n[00:21:03] Pirula42 plays [Mountain].\r\n[00:21:05] Pirula42 casts [Bomat Courier].\r\n[00:21:09] Tesseract112 is being attacked by [Bomat Courier]\r\n[00:21:09] Pirula42 puts triggered ability from [Bomat Courier] onto the stack (Whenever this creature attacks, exile the top card of your library face down.).\r\n[00:21:13] Turn 2: Tesseract112\r\n[00:21:25] Tesseract112 plays [Isolated Chapel].\r\n[00:21:27] Tesseract112 casts [Grim Bauble].\r\n[00:21:28] Tesseract112 puts triggered ability from [Grim Ba<br/>
# 500 Error at /api/upload: Q&A

## Introduction

In our previous article, we discussed a 500 error that occurred at the `/api/upload` endpoint. The error was caused by a MySQLdb.OperationalError with the error code 2006, indicating that the server has gone away. In this article, we will be answering some frequently asked questions related to this error.

## Q: What is a MySQLdb.OperationalError?

A: A MySQLdb.OperationalError is an exception that is raised when there is a problem with the database connection or the database itself. In this case, the error code 2006 indicates that the server has gone away.

## Q: What causes a MySQLdb.OperationalError?

A: There are several reasons why a MySQLdb.OperationalError may occur. Some common causes include:

* The database server has crashed or is not responding.
* The database connection has timed out.
* The database query is too complex or is causing a deadlock.
* The database is experiencing high traffic or is overloaded.

## Q: How can I prevent a MySQLdb.OperationalError?

A: To prevent a MySQLdb.OperationalError, you can take the following steps:

* Make sure that the database server is running and is responding correctly.
* Increase the database connection timeout to allow for more time to establish a connection.
* Simplify complex database queries to reduce the risk of a deadlock.
* Monitor database traffic and adjust the database configuration as needed to prevent overload.

## Q: What is the impact of a MySQLdb.OperationalError on my application?

A: A MySQLdb.OperationalError can have a significant impact on your application, depending on the severity of the error and the design of your application. Some possible impacts include:

* The application may crash or become unresponsive.
* The application may return an error message to the user.
* The application may lose data or experience data corruption.
* The application may experience performance degradation or slow down.

## Q: How can I troubleshoot a MySQLdb.OperationalError?

A: To troubleshoot a MySQLdb.OperationalError, you can take the following steps:

* Check the database server logs for any errors or warnings.
* Check the database connection settings to ensure that they are correct.
* Check the database query to ensure that it is correct and is not causing a deadlock.
* Use a database debugging tool to monitor the database activity and identify any issues.

## Q: What is the best way to handle a MySQLdb.OperationalError in my application?

A: The best way to handle a MySQLdb.OperationalError in your application depends on the specific requirements of your application and the design of your application. Some possible ways to handle the error include:

* Catch the exception and return an error message to the user.
* Retry the database query after a short delay to allow the database to recover.
* Use a database connection pool to manage multiple database connections and reduce the risk of a connection timeout.
* Implement a fallback strategy to use a different database or data source if the primary database is unavailable.

## Conclusion

In this article, we have discussed a 500 error that occurred at the `/api/upload` endpoint and answered some frequently asked questions related to this error. We hope that this information has been helpful in understanding the causes and impacts of a MySQLdb.OperationalError and in troubleshooting and handling this error in your application.