Gophercises - 14 - Panic/Recover Middleware

Problem

• https://github.com/gophercises/recover
• https://gophercises.com/exercises/recover

Solution

• main.go: Implemented everything including Flusher and Hijack.

Lessons Learned

Print Stacktrace

• debug.Stack(): Returns a []byte (remember to convert to string before printing).
• runtime.Stack(buf []byte, all bool) int: Pass a []byte that gets filled.

Custom http.ResponseWriter

See this:

• https://upgear.io/blog/golang-tip-wrapping-http-response-writer-for-middleware/

Embed

Embed stuff in structs to use them.

type myRW struct {
    http.ResponseWriter
}

Type Assertion

• https://tour.golang.org/methods/15

t, ok := i.(T)
if ok {
    // i.T is implemented and stored in T
}