global panic handler in Go

panic_handler.go

package main

import "fmt"

// Usage:
//
// func main() {
// 	defer panicHandler()
// }
//
// Do note that this would not catch all panics.
// eg; `panic(nil)` will not be caught
//
func panicHandler() {
	// keep an eye on the accepeted proposal: issues/37023
	// https://github.com/golang/go/issues/37023
	//
	// Also keep an eye on proposal: issues/42888
	// https://github.com/golang/go/issues/42888

	r := recover()
	if r != nil {
		fmt.Println(`
		\n
		panicHandler recovered.
		This is where you call your logging service.
		And or your metric service to take error counts.
		\n\n
	`)
		panic(r)
	}
}

usage.go

package main

import (
	"context"
	"fmt"
	"log"
	"os"

	"github.com/docker/docker/client"
	"github.com/komuw/meli"
)

func main() {
	defer panicHandler()
	fmt.Println("Hello, main func")
	docker()
}

func docker() {
	fmt.Println("docker func called")

	dc := &meli.DockerContainer{
		ComposeService: meli.ComposeService{Image: "busybox"},
		LogMedium:      os.Stdout,
		FollowLogs:     true}

	dc = nil // will cause panic

	ctx := context.Background()
	cli, err := client.NewEnvClient()
	if err != nil {
		log.Fatal(err, " :unable to intialize docker client")
	}
	defer cli.Close()

	meli.LoadAuth() // load dockerhub info
	err = meli.PullDockerImage(ctx, cli, dc)
}