When to Use `context.TODO()` vs `context.Background()` in Go Mongo-Driver?

Choosing Between context.TODO() and context.Background() in Go Mongo-Driver

Working with non-nil empty Contexts in Go Mongo-Driver can be confusing. Understanding the purpose of context.Background() and context.TODO() can help clarify their usage.

According to the Go documentation:

• context.Background(): Returns a non-nil, empty Context that is never canceled, has no values, and no deadline. It is typically used in the main function, initialization, and tests, and as the top-level Context for incoming requests.
• context.TODO(): Returns a non-nil, empty Context. Code should use context.TODO() when it's unclear which Context to use or it is not yet available (because the surrounding function has not yet been extended to accept a Context parameter).

Recommendation: When you need a context but don't have one (yet) and don't know what to use, use context.TODO(). This documents that you don't know what Context to use or it is not yet available.

If you do have a context, consider using that context, or deriving a new one from it. For example:

• If you have an HTTP handler and a MongoDB query, using the Request.Context() could save resources because it is canceled when the HTTP client aborts the request.
• If you have a timeout for a MongoDB operation, derive a context from context.Background() with the appropriate timeout.

Understanding the difference between context.TODO() and context.Background() can help you choose the appropriate Context for your Go Mongo-Driver usage, ensuring optimal resource allocation and handling.

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