How to Store Panic Stacktraces in Go?

Retrieving and Storing Panic Stacktraces

Panics in Go produce valuable stacktraces that provide debugging insights. However, recovering from a panic only returns an error message that lacks detailed line-level information.

To address this limitation, the runtime/debug package offers a solution. Here's how you can store the stacktrace from a panic as a variable:

package main

import (
    "fmt"
    "runtime/debug"
)

func main() {
    defer func() {
        if r := recover(); r != nil {
            stacktrace := string(debug.Stack())
            fmt.Println("Stacktrace from panic:", stacktrace)
        }
    }()

    var mySlice []int
    j := mySlice[0] // panic

    fmt.Printf("Hello, playground %d", j) // unreachable code
}

Output:

Stacktrace from panic:
goroutine 1 [running]:
runtime/debug.Stack(0x1042ff18, 0x98b2, 0x17d048, 0x17d1c0)
    /usr/local/go/src/runtime/debug/stack.go:24 +0xc0
main.main.func1()
    /tmp/sandbox973508195/main.go:11 +0x60
panic(0x17d048, 0x17d1c0)
    /usr/local/go/src/runtime/panic.go:665 +0x260
main.main()
    /tmp/sandbox973508195/main.go:16 +0x60

This code demonstrates how to capture the stacktrace in the event of a panic, providing line-by-line details that facilitate effective debugging.

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