Changes receiver and inhibition rules arrays to slices of value items instead of pointer items

cmd/alertmanager/main.go

@@ -131,7 +131,7 @@ const defaultClusterAddr = "0.0.0.0:9094"
 
 // buildReceiverIntegrations builds a list of integration notifiers off of a
 // receiver config.
-func buildReceiverIntegrations(nc *config.Receiver, tmpl *template.Template, logger log.Logger) ([]notify.Integration, error) {
+func buildReceiverIntegrations(nc config.Receiver, tmpl *template.Template, logger log.Logger) ([]notify.Integration, error) {
 	var (
 		errs         types.MultiError
 		integrations []notify.Integration

cmd/alertmanager/main_test.go

@@ -31,12 +31,12 @@ func (s sendResolved) SendResolved() bool { return bool(s) }
 
 func TestBuildReceiverIntegrations(t *testing.T) {
 	for _, tc := range []struct {
-		receiver *config.Receiver
+		receiver config.Receiver
 		err      bool
 		exp      []notify.Integration
 	}{
 		{
-			receiver: &config.Receiver{
+			receiver: config.Receiver{
 				Name: "foo",
 				WebhookConfigs: []*config.WebhookConfig{
 					{
@@ -56,7 +56,7 @@ func TestBuildReceiverIntegrations(t *testing.T) {
 			},
 		},
 		{
-			receiver: &config.Receiver{
+			receiver: config.Receiver{
 				Name: "foo",
 				WebhookConfigs: []*config.WebhookConfig{
 					{

config/config.go

@@ -295,11 +295,11 @@ func (ti *TimeInterval) UnmarshalYAML(unmarshal func(interface{}) error) error {
 
 // Config is the top-level configuration for Alertmanager's config files.
 type Config struct {
-	Global       *GlobalConfig  `yaml:"global,omitempty" json:"global,omitempty"`
-	Route        *Route         `yaml:"route,omitempty" json:"route,omitempty"`
-	InhibitRules []*InhibitRule `yaml:"inhibit_rules,omitempty" json:"inhibit_rules,omitempty"`
-	Receivers    []*Receiver    `yaml:"receivers,omitempty" json:"receivers,omitempty"`
-	Templates    []string       `yaml:"templates" json:"templates"`
+	Global       *GlobalConfig `yaml:"global,omitempty" json:"global,omitempty"`
+	Route        *Route        `yaml:"route,omitempty" json:"route,omitempty"`
+	InhibitRules []InhibitRule `yaml:"inhibit_rules,omitempty" json:"inhibit_rules,omitempty"`
+	Receivers    []Receiver    `yaml:"receivers,omitempty" json:"receivers,omitempty"`
+	Templates    []string      `yaml:"templates" json:"templates"`
 	// Deprecated. Remove before v1.0 release.
 	MuteTimeIntervals []MuteTimeInterval `yaml:"mute_time_intervals,omitempty" json:"mute_time_intervals,omitempty"`
 	TimeIntervals     []TimeInterval     `yaml:"time_intervals,omitempty" json:"time_intervals,omitempty"`

config/config_test.go

@@ -895,7 +895,7 @@ func TestEmptyFieldsAndRegex(t *testing.T) {
 				},
 			},
 		},
-		Receivers: []*Receiver{
+		Receivers: []Receiver{
 			{
 				Name: "team-X-mails",
 				EmailConfigs: []*EmailConfig{

inhibit/inhibit.go

@@ -44,7 +44,7 @@ type Inhibitor struct {
 }
 
 // NewInhibitor returns a new Inhibitor.
-func NewInhibitor(ap provider.Alerts, rs []*config.InhibitRule, mk types.Marker, logger log.Logger) *Inhibitor {
+func NewInhibitor(ap provider.Alerts, rs []config.InhibitRule, mk types.Marker, logger log.Logger) *Inhibitor {
 	ih := &Inhibitor{
 		alerts: ap,
 		marker: mk,
@@ -166,7 +166,7 @@ type InhibitRule struct {
 }
 
 // NewInhibitRule returns a new InhibitRule based on a configuration definition.
-func NewInhibitRule(cr *config.InhibitRule) *InhibitRule {
+func NewInhibitRule(cr config.InhibitRule) *InhibitRule {
 	var (
 		sourcem labels.Matchers
 		targetm labels.Matchers

inhibit/inhibit_test.go

@@ -153,7 +153,7 @@ func TestInhibitRuleMatches(t *testing.T) {
 	}
 
 	m := types.NewMarker(prometheus.NewRegistry())
-	ih := NewInhibitor(nil, []*config.InhibitRule{&rule1, &rule2}, m, nopLogger)
+	ih := NewInhibitor(nil, []config.InhibitRule{rule1, rule2}, m, nopLogger)
 	now := time.Now()
 	// Active alert that matches the source filter of rule1.
 	sourceAlert1 := &types.Alert{
@@ -249,7 +249,7 @@ func TestInhibitRuleMatchers(t *testing.T) {
 	}
 
 	m := types.NewMarker(prometheus.NewRegistry())
-	ih := NewInhibitor(nil, []*config.InhibitRule{&rule1, &rule2}, m, nopLogger)
+	ih := NewInhibitor(nil, []config.InhibitRule{rule1, rule2}, m, nopLogger)
 	now := time.Now()
 	// Active alert that matches the source filter of rule1.
 	sourceAlert1 := &types.Alert{
@@ -370,8 +370,8 @@ func TestInhibit(t *testing.T) {
 	t.Parallel()
 
 	now := time.Now()
-	inhibitRule := func() *config.InhibitRule {
-		return &config.InhibitRule{
+	inhibitRule := func() config.InhibitRule {
+		return config.InhibitRule{
 			SourceMatch: map[string]string{"s": "1"},
 			TargetMatch: map[string]string{"t": "1"},
 			Equal:       model.LabelNames{"e"},
@@ -452,7 +452,7 @@ func TestInhibit(t *testing.T) {
 	} {
 		ap := newFakeAlerts(tc.alerts)
 		mk := types.NewMarker(prometheus.NewRegistry())
-		inhibitor := NewInhibitor(ap, []*config.InhibitRule{inhibitRule()}, mk, nopLogger)
+		inhibitor := NewInhibitor(ap, []config.InhibitRule{inhibitRule()}, mk, nopLogger)
 
 		go func() {
 			for ap.finished != nil {

test/with_api_v2/acceptance/inhibit_test.go

@@ -154,3 +154,39 @@ inhibit_rules:
 
 	t.Log(co.Check())
 }
+
+func TestEmptyInhibitionRule(t *testing.T) {
+	t.Parallel()
+
+	// This integration test checks that when we have empty inhibition rules,
+	// there is no panic caused by null-pointer references.
+
+	conf := `
+route:
+  receiver: "default"
+  group_by: []
+  group_wait:      1s
+  group_interval:  1s
+  repeat_interval: 1s
+
+receivers:
+- name: "default"
+  webhook_configs:
+  - url: 'http://%s'
+
+inhibit_rules:
+-
+`
+
+	at := NewAcceptanceTest(t, &AcceptanceOpts{
+		Tolerance: 150 * time.Millisecond,
+	})
+
+	co := at.Collector("webhook")
+	wh := NewWebhook(t, co)
+
+	at.AlertmanagerCluster(fmt.Sprintf(conf, wh.Address()), 1)
+	at.Run()
+
+	t.Log(co.Check())
+}