Initialize prefix remapping map to avoid panic

A `nil` `target` passed to `AsOptionalMap` causes a panic.

Signed-off-by: Pierangelo Di Pilato <[email protected]>

leaderelection/config.go

@@ -101,10 +101,11 @@ func (c *Config) GetComponentConfig(name string) ComponentConfig {
 
 func defaultConfig() *Config {
 	return &Config{
-		Buckets:       1,
-		LeaseDuration: 60 * time.Second,
-		RenewDeadline: 40 * time.Second,
-		RetryPeriod:   10 * time.Second,
+		Buckets:                 1,
+		LeaseDuration:           60 * time.Second,
+		RenewDeadline:           40 * time.Second,
+		RetryPeriod:             10 * time.Second,
+		LeaseNamesPrefixMapping: make(map[string]string, 0),
 	}
 }
 

leaderelection/config_test.go

@@ -26,6 +26,7 @@ import (
 
 	"github.com/google/go-cmp/cmp"
 	corev1 "k8s.io/api/core/v1"
+
 	"knative.dev/pkg/kmap"
 )
 
@@ -168,6 +169,57 @@ func TestNewConfigMapFromData(t *testing.T) {
 	}
 }
 
+func TestNewConfigFromMap(t *testing.T) {
+
+	tt := []struct {
+		name    string
+		data    map[string]string
+		want    Config
+		wantErr bool
+	}{{
+		name: "ok config",
+		data: map[string]string{
+			"lease-duration": "15s",
+			"buckets":        "5",
+		},
+		want: Config{
+			Buckets:                 5,
+			LeaseDuration:           15 * time.Second,
+			RenewDeadline:           40 * time.Second,
+			RetryPeriod:             10 * time.Second,
+			LeaseNamesPrefixMapping: map[string]string{},
+		},
+	}, {
+		name: "ok config, prefix map",
+		data: map[string]string{
+			"lease-duration":              "15s",
+			"buckets":                     "5",
+			"map-lease-prefix.reconciler": "reconciler1",
+		},
+		want: Config{
+			Buckets:       5,
+			LeaseDuration: 15 * time.Second,
+			RenewDeadline: 40 * time.Second,
+			RetryPeriod:   10 * time.Second,
+			LeaseNamesPrefixMapping: map[string]string{
+				"reconciler": "reconciler1",
+			},
+		},
+	}}
+
+	for _, tc := range tt {
+		t.Run(tc.name, func(t *testing.T) {
+			c, err := NewConfigFromMap(tc.data)
+			if tc.wantErr != (err != nil) {
+				t.Fatalf("want err %v got %v", tc.wantErr, err)
+			}
+			if diff := cmp.Diff(tc.want, *c); diff != "" {
+				t.Fatal("(-want, +got)", diff)
+			}
+		})
+	}
+}
+
 func TestGetComponentConfig(t *testing.T) {
 	const expectedName = "the-component"
 	cases := []struct {