Go: returning from defer

by

In a deferred function you can alter the returned parameters, but you can’t return a new set. So a simple change to what you have will make it work.

There is another problem with what you wrote, namely that the you’ve paniced with a string but are expecting an error in your type assertion.

Here is a fix for both of those (Play)

defer func() {
    if r := recover(); r != nil {
        fmt.Println("Recovered in f", r)
        // find out exactly what the error was and set err
        switch x := r.(type) {
        case string:
            err = errors.New(x)
        case error:
            err = x
        default:
            err = errors.New("Unknown panic")
        }
        // invalidate rep
        rep = nil
        // return the modified err and rep
    }
}()

Related Contents:

  1. How to exit a go program honoring deferred calls?
  2. Why would return parameters be named?
  3. Should I use panic or return error?
  4. Application auto build versioning
  5. How to parse unix timestamp to time.Time
  6. Go test string contains substring
  7. Is there a way to do repetitive tasks at intervals?
  8. “used as value” in function call
  9. Accessing local packages within a go module (go 1.11)
  10. How can I see the internal compile commands which fail in a “go get” installation?
  11. Reason for huge size of compiled executable of Go
  12. How do you serve a static html file using a go web server?
  13. Collect values in order, each containing a map
  14. Which way to name a function in Go, CamelCase or Semi-CamelCase?
  15. What is the correct way to find the min between two integers in Go?
  16. What is the meaning of “dot parenthesis” syntax? [duplicate]
  17. How to send a POST request in Go?
  18. Get exit code – Go
  19. What language is the compiler of Go programming language written in?
  20. How can I open files relative to my GOPATH?
  21. Call a function from another package in Go
  22. Is it possible to initialize slice with specific values?
  23. Assigning null to JSON fields instead of empty strings
  24. context.WithValue: how to add several key-value pairs
  25. How best do I keep a long running Go program, running?
  26. is there a way to create an instance of a struct from a string?
  27. How to remove items from a slice while ranging over it?
  28. Insert a value in a slice at a given index
  29. Constant struct in Go
  30. In Go, how do I capture stdout of a function into a string?
  31. copy pointer values *a = *b in golang
  32. What is the difference between := and = in Go?
  33. Golang struct calling embedded type methods when method has been overloaded
  34. Empty or not required struct fields
  35. Implicit memory aliasing in for loop
  36. Golang conditional compilation
  37. What’s the difference between `//go:build` and `// +build` directives?
  38. Is there a way to reuse an argument in fmt.Printf?
  39. Golang separating items with comma in template
  40. Convert rune to int?
  41. How can I receive an uploaded file using a Golang net/http server?
  42. First class functions in Go
  43. go module @latest found but does not contain package
  44. Unmarshaling Into an Interface{} and Then Performing Type Assertion
  45. Idiomatic goroutine termination and error handling
  46. How do you statically link a c library in go using cgo?
  47. Go array initialization
  48. Pass slice as function argument, and modify the original slice
  49. Public, Private – Upper Case, Lower Case:
  50. Convert []string to []interface{} [duplicate]

Leave a Comment