Breaking: Add network health route and flag

api/core.go

@@ -483,6 +483,8 @@ type (
 	InfoResNodeStatus struct {
 		// Whether the node is healthy.
 		IsHealthy bool `serix:""`
+		// Whether the network is healthy (finalization is not delayed).
+		IsNetworkHealthy bool `serix:""`
 		// The accepted tangle time.
 		AcceptedTangleTime time.Time `serix:""`
 		// The relative accepted tangle time.

api/core_test.go

@@ -23,6 +23,7 @@ func Test_CoreAPIDeSerialize(t *testing.T) {
 				Version: "2.0.0",
 				Status: &api.InfoResNodeStatus{
 					IsHealthy:                   false,
+					IsNetworkHealthy:            false,
 					AcceptedTangleTime:          time.Unix(1690879505, 0).UTC(),
 					RelativeAcceptedTangleTime:  time.Unix(1690879505, 0).UTC(),
 					ConfirmedTangleTime:         time.Unix(1690879505, 0).UTC(),
@@ -301,6 +302,7 @@ func Test_CoreAPIJSONSerialization(t *testing.T) {
 				Version: "2.0.0",
 				Status: &api.InfoResNodeStatus{
 					IsHealthy:                   false,
+					IsNetworkHealthy:            false,
 					AcceptedTangleTime:          time.Unix(1690879505, 0).UTC(),
 					RelativeAcceptedTangleTime:  time.Unix(1690879505, 0).UTC(),
 					ConfirmedTangleTime:         time.Unix(1690879505, 0).UTC(),
@@ -330,6 +332,7 @@ func Test_CoreAPIJSONSerialization(t *testing.T) {
 	"version": "2.0.0",
 	"status": {
 		"isHealthy": false,
+		"isNetworkHealthy": false,
 		"acceptedTangleTime": "1690879505000000000",
 		"relativeAcceptedTangleTime": "1690879505000000000",
 		"confirmedTangleTime": "1690879505000000000",

api/endpoints.go

@@ -124,6 +124,10 @@ const (
 	// 		MIMEApplicationVendorIOTASerializerV2 => bytes.
 	CoreEndpointInfo = "/info"
 
+	// CoreEndpointNetworkHealth is the endpoint for getting the network health.
+	// GET returns http status code 200 if the network is healthy (finalization is not delayed).
+	CoreEndpointNetworkHealth = "/network/health"
+
 	// CoreEndpointNetworkMetrics is the endpoint for getting the network metrics.
 	// GET returns the network metrics.
 	// "Accept" header:
@@ -289,6 +293,7 @@ const (
 
 var (
 	CoreRouteInfo                              = route(CorePluginName, CoreEndpointInfo)
+	CoreRouteNetworkHealth                     = route(CorePluginName, CoreEndpointNetworkHealth)
 	CoreRouteNetworkMetrics                    = route(CorePluginName, CoreEndpointNetworkMetrics)
 	CoreRouteBlocks                            = route(CorePluginName, CoreEndpointBlocks)
 	CoreRouteBlock                             = route(CorePluginName, CoreEndpointBlock)

nodeclient/http_api_client.go

@@ -255,6 +255,20 @@ func (client *Client) Info(ctx context.Context) (*api.InfoResponse, error) {
 	return res, nil
 }
 
+// NetworkHealth returns whether the network is healthy (finalization is not delayed).
+func (client *Client) NetworkHealth(ctx context.Context) (bool, error) {
+	//nolint:bodyclose
+	if _, err := client.Do(ctx, http.MethodGet, api.CoreRouteNetworkHealth, nil, nil); err != nil {
+		if ierrors.Is(err, ErrHTTPServiceUnavailable) {
+			return false, nil
+		}
+
+		return false, err
+	}
+
+	return true, nil
+}
+
 // NetworkMetrics gets the current network metrics.
 func (client *Client) NetworkMetrics(ctx context.Context) (*api.NetworkMetricsResponse, error) {
 	res := new(api.NetworkMetricsResponse)

nodeclient/http_api_client_test.go

@@ -105,10 +105,11 @@ func nodeClient(t *testing.T) *nodeclient.Client {
 
 	ts := time.Now()
 	originInfo := &api.InfoResponse{
-		Name:    "HORNET",
+		Name:    "iota-core",
 		Version: "1.0.0",
 		Status: &api.InfoResNodeStatus{
 			IsHealthy:                   true,
+			IsNetworkHealthy:            true,
 			LatestAcceptedBlockSlot:     tpkg.RandSlot(),
 			LatestConfirmedBlockSlot:    tpkg.RandSlot(),
 			LatestFinalizedSlot:         iotago.SlotIndex(142857),
@@ -163,6 +164,27 @@ func TestClient_Health(t *testing.T) {
 	require.False(t, healthy)
 }
 
+func TestClient_NetworkHealth(t *testing.T) {
+	defer gock.Off()
+
+	gock.New(nodeAPIUrl).
+		Get(api.CoreRouteNetworkHealth).
+		Reply(200)
+
+	nodeAPI := nodeClient(t)
+	healthy, err := nodeAPI.NetworkHealth(context.Background())
+	require.NoError(t, err)
+	require.True(t, healthy)
+
+	gock.New(nodeAPIUrl).
+		Get(api.CoreRouteNetworkHealth).
+		Reply(503)
+
+	healthy, err = nodeAPI.NetworkHealth(context.Background())
+	require.NoError(t, err)
+	require.False(t, healthy)
+}
+
 func TestClient_NetworkMetrics(t *testing.T) {
 	defer gock.Off()