Introduce OptionFunc to expose Producer.RequiredAcks (#79)

trace/kafka/option.go

@@ -8,6 +8,19 @@ import (
 	"github.com/beatlabs/patron/log"
 )
 
+// RequiredAcks is used in Produce Requests to tell the broker how many replica acknowledgements
+// it must see before responding.
+type RequiredAcks int16
+
+const (
+	// NoResponse doesn't send any response, the TCP ACK is all you get.
+	NoResponse RequiredAcks = 0
+	// WaitForLocal waits for only the local commit to succeed before responding.
+	WaitForLocal RequiredAcks = 1
+	// WaitForAll waits for all in-sync replicas to commit before responding.
+	WaitForAll RequiredAcks = -1
+)
+
 // OptionFunc definition for configuring the async producer in a functional way.
 type OptionFunc func(*AsyncProducer) error
 
@@ -38,3 +51,12 @@ func Timeouts(dial time.Duration) OptionFunc {
 		return nil
 	}
 }
+
+// RequiredAcksPolicy option for adjusting how many replica acknowledgements
+// broker must see before responding.
+func RequiredAcksPolicy(ack RequiredAcks) OptionFunc {
+	return func(ap *AsyncProducer) error {
+		ap.cfg.Producer.RequiredAcks = sarama.RequiredAcks(ack)
+		return nil
+	}
+}

trace/kafka/option_test.go

@@ -64,3 +64,29 @@ func TestTimeouts(t *testing.T) {
 		})
 	}
 }
+
+func TestRequiredAcksPolicy(t *testing.T) {
+	type args struct {
+		requiredAcks RequiredAcks
+	}
+	tests := []struct {
+		name    string
+		args    args
+		wantErr bool
+	}{
+		{name: "success", args: args{requiredAcks: NoResponse}, wantErr: false},
+		{name: "success", args: args{requiredAcks: WaitForAll}, wantErr: false},
+		{name: "success", args: args{requiredAcks: WaitForLocal}, wantErr: false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			ap := AsyncProducer{cfg: sarama.NewConfig()}
+			err := RequiredAcksPolicy(tt.args.requiredAcks)(&ap)
+			if tt.wantErr {
+				assert.Error(t, err)
+			} else {
+				assert.NoError(t, err)
+			}
+		})
+	}
+}