Question 1

How to use robustly to prevent a Go program from crashing on panics?

Accepted Answer

Wrap your function in robustly.Run(), like robustly.Run(func() { yourCode() }, &RunOptions{RateLimit: 1.0}). This will restart the function automatically after a panic, keeping the program running for long-lived apps such as event processors.

Question 2

Robustly vs standard defer/recover in Go - which should I use?

Accepted Answer

Use robustly if you need automatic restarts and rate limiting for high-availability apps; it's more suited for rare panics in stateful systems. Standard recover is better for localized panic handling without restart logic, like in web handlers.

Question 3

Can robustly handle errors other than panics?

Accepted Answer

No, robustly only targets panics, not general errors or returned errors. It's designed for unexpected crashes, so you still need proper error handling for non-panic scenarios in your code.

Question 4

How to test my app's fault tolerance with robustly?

Accepted Answer

Add robustly.Crash() calls at key points, then configure with CrashSetup() using file:line:probability strings to inject panics probabilistically. This helps verify that Run() properly restarts functions without crashing the whole program.

Question 5

What are the default settings in robustly.Run?

Accepted Answer

Defaults include RateLimit: 1.0 crashes per second, Timeout: 1 second, PrintStack: false, and RetryDelay: 0 nanoseconds. You can override these with RunOptions for custom behavior like adding delays or printing stack traces.

Question 6

Is robustly good for web servers or just special cases?

Accepted Answer

It's inspired by net/http but best for specific, high-availability backends like monitoring agents. For general web servers, built-in Go patterns might suffice, but robustly can add extra resilience if rare panics are a concern.

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