How to catch errors from Goroutines?

Question

I've created function which needs to run in goroutine, the code is working(this is just simple sample to illustrate the issue)

go rze(ftFilePath, 2)


func rze(ftDataPath,duration time.Duration) error {

}

I want to do something like this

errs := make(chan error, 1)
err := go rze(ftFilePath, 2)
if err != nil{
    r <- Result{result, errs}
} 

but not sure how to it, most of the examples show how you do it when you using func https://tour.golang.org/concurrency/5

Answer 1

You cannot use the return value of a function that is executed with the go keyword. Use an anonymous function instead:

errs := make(chan error, 1)
go func() {
    errs <- rze(ftFilePath, 2)
}()

// later:
if err := <-errs; err != nil {
    // handle error
}

Answer 2

You can use golang errgroup pkg.

var eg errgroup.Group
eg.Go(func() error {
  return rze(ftFilePath, 2)
})
if err := g.Wait(); err != nil {
    r <- Result{result, errs}
}