add another package to better show the patternHEADmaster

1 files changed, 45 insertions, 0 deletions

diff --git a/business/business.go b/business/business.go
new file mode 100644
index 0000000..ecb54ad
--- /dev/null
+++ b/business/business.go
@@ -0,0 +1,45 @@
+package business
+
+import (
+	"fmt"
+
+	"www.thenautilus.net/cgit/go-example/config"
+	"www.thenautilus.net/cgit/go-example/something"
+)
+
+type OverError struct {
+	Value, Threshold int
+}
+
+func (e OverError) Error() string {
+	return fmt.Sprintf("value %d is above threshold %d", e.Value, e.Threshold)
+}
+
+type Logic struct {
+	somethingClient *something.Something
+	threshold       int
+}
+
+func New(conf *config.BusinessLogicConfig, client *something.Something) Logic {
+	return Logic{
+		somethingClient: client,
+		threshold:       conf.Threshold,
+	}
+}
+
+func (bl *Logic) DoSomething() error {
+	value, err := bl.somethingClient.FetchValue()
+	if err != nil {
+		return fmt.Errorf("failed to fetch value: %w", err)
+	}
+
+	if value > bl.threshold {
+		fmt.Printf("OVER! %d > %d\n", value, bl.threshold)
+
+		return OverError{value, bl.threshold}
+	}
+
+	fmt.Printf("all good")
+
+	return nil
+}