initial import

best-practices/error-behaviour/external_lib.go

@@ -0,0 +1,12 @@
+package main
+
+import (
+	"net"
+)
+
+func callRemoteService() error {
+
+	var err net.UnknownNetworkError = "blub"
+	return err
+
+}

best-practices/error-behaviour/main.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"log"
+	"net"
+)
+
+func isTimeout(err error) bool {
+
+	type timeout interface {
+		Timeout() bool
+	}
+
+	v, ok := err.(timeout)
+	if !ok {
+		return false
+	}
+
+	return v.Timeout()
+
+}
+
+func main() {
+	err := callRemoteService()
+
+	if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
+		//nochmal versuchen
+		log.Printf("it's a unknown network error: %v\n", nerr)
+	}
+
+	if err != nil && !isTimeout(err) {
+		log.Fatal(err)
+	}
+}