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refactor: handle err with fprintln io png detector ifaces

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This commit is contained in:
Inanc Gumus
2019-11-08 11:12:20 +03:00
parent cf66e4b720
commit 88d16d86d5
1 changed files with 6 additions and 5 deletions
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11
interfaces/15-png-detector/main.go
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@ -12,25 +12,26 @@ import (
"bytes" "bytes"
"fmt" "fmt"
"io" "io"
"log"
"net/http" "net/http"
"os"
) )
func main() { func main() {
// initiate the transmission channel (http connection) to the webserver. // initiate the transmission channel (http connection) to the webserver.
resp, err := http.Get("https://inancgumus.github.com/x/rosie.unknown") resp, err := http.Get("https://inancgumus.github.com/x/rosie.unknown")
if err != nil { if err != nil {
log.Fatal(err) fmt.Fprintln(os.Stderr, err)
return
} }
// close it for keep-alive header. // close it so the http package can reuse the connection.
// so the http package can reuse the connection.
defer resp.Body.Close() defer resp.Body.Close()
// resp.Body here is an io.ReadCloser: Read() + Close() methods. // resp.Body here is an io.ReadCloser: Read() + Close() methods.
// but in the transfer function it's an io.Reader: Only the Read() method. // but in the transfer function it's an io.Reader: Only the Read() method.
n, err := transfer(resp.Body) n, err := transfer(resp.Body)
if err != nil { if err != nil {
log.Fatal(err) fmt.Fprintln(os.Stderr, err)
return
} }
fmt.Printf("%d bytes transferred.\n", n) fmt.Printf("%d bytes transferred.\n", n)