What are the best practices for using the context package in Go?

What are the best practices for using the context package in Go?

When using the context package in Go, it's important to follow these best practices: 1. Use context.Context as the first parameter in your functions. 2. Pass contexts down the call chain, but avoid storing them in global variables. 3. Use context cancellation to prevent resource leaks. 4. Don't use context for passing optional parameters.

Can you explain why I shouldn't store context in global variables?

Storing context in global variables can lead to unexpected behavior, as contexts are meant to be request-scoped. This can cause issues with cancellation and deadlines, making your application less predictable.

What are some common mistakes developers make with context?

Common mistakes include: 1. Not checking for cancellation signals. 2. Using context for passing data instead of just for cancellation and deadlines. 3. Creating new contexts unnecessarily, which can lead to performance issues.

How do I handle timeouts with context?

You can handle timeouts by using context.WithTimeout. This function creates a new context that will automatically cancel after the specified duration, allowing you to manage long-running operations effectively.