If your application relies on many goroutines it can be easy to forget to properly handle errors:
func Do() {
go func() {
a := make([]int, 1)
a[1] = 0 /* Index out of bounds! */
}()
}
If your goroutine doesn’t require returning a result at a later time, try using a defer/recover to catch errors at runtime:
go func() {
defer func() {
if err := recover(); err != nil {
log.Printf("An error occurred: %s", err)
}
}()
a := make([]int, 1)
a[1] = 0
}()
Otherwise, define a struct that lets you return a result or error :
type Result struct {
Value int
Err error
}
func Do() {
c := make(chan Result)
go func(r chan Result) {
result, err := doExpensiveStuff()
r <- Result{result, err}
}(c)
r := <-c
if r.Err != nil {
log.Fatal(r.Err)
}
}