Fixing the asyncpg Error: 'Cannot Perform Operation: Another Operation is in Progress' in aiogram

Discover how to resolve the `asyncpg` error in `aiogram` with our step-by-step guide. Learn about the proper implementation of database operations without conflicts.
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Fixing the asyncpg Error: "Cannot Perform Operation: Another Operation is in Progress" in aiogram

When building applications that utilize asynchronous database interactions, developers often encounter various challenges and errors. One particularly common error encountered when using asyncpg alongside aiogram is the message stating: "cannot perform operation: another operation is in progress." This issue arises primarily due to improper handling of asynchronous database connections. In this guide, we will explore the problem and provide a comprehensive solution to address it.

Understanding the Problem

The Scenario

The error occurs when multiple asynchronous operations are attempted on the database connection simultaneously. In a typical setup, asyncpg uses a connection pool to manage database connections, but if these connections are not managed correctly, this error can arise.

The Context

From the provided code snippets, we can see that the error originates from executing database queries while another operation is still in progress. Developers often need to ensure that they acquire a database connection, execute their query, and then release the connection properly.

The Error Message

The error traceback usually looks something like this:

[[See Video to Reveal this Text or Code Snippet]]

The Solution

Step 1: Refactor the Database Class

To handle database queries correctly, we need to ensure that we correctly manage database connections. Below is a refactored version of the Database class:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Create the Connection Pool

Instead of creating the connection pool in the Database constructor, we should define a separate function to initialize the pool during startup:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Register Pool on Startup

In the main logic of your application, ensure that the pool is created when the application starts. Update your main function as follows:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Modify the Echo Function

Finally, adjust the echo_msg function to reference the newly structured database instance:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By managing your database connections more effectively, you can avoid the "cannot perform operation: another operation is in progress" error when working with asyncpg and aiogram. The key takeaways from this post are:

Always acquire a connection from the pool before performing any database operation.

Use async with to ensure that the connection is properly released back to the pool after completion.

Ensure your pool is initialized during the startup phase of your application.

By following these practices, you can create more robust and error-free asynchronous applications using asyncpg and aiogram. Happy coding!