Inject service FQDN into kubevirt node, let onos resolve service IP

Change-Id: I6f3f66ad97f8be461c464dad5d133f3477c40f5a
diff --git a/apps/kubevirt-node/app/BUILD b/apps/kubevirt-node/app/BUILD
index fbc201a..fcab1fb 100644
--- a/apps/kubevirt-node/app/BUILD
+++ b/apps/kubevirt-node/app/BUILD
@@ -32,6 +32,7 @@
     "@jackson_datatype_jsr310//jar",
     "@snakeyaml//jar",
     "@commons_net//jar",
+    "@dns_java//jar",
 ]
 
 TEST_DEPS = TEST_ADAPTERS + TEST_REST + [
diff --git a/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/codec/KubevirtApiConfigCodec.java b/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/codec/KubevirtApiConfigCodec.java
index 3c09605..84a17e5 100644
--- a/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/codec/KubevirtApiConfigCodec.java
+++ b/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/codec/KubevirtApiConfigCodec.java
@@ -41,6 +41,7 @@
     private static final String CA_CERT_DATA = "caCertData";
     private static final String CLIENT_CERT_DATA = "clientCertData";
     private static final String CLIENT_KEY_DATA = "clientKeyData";
+    private static final String SERVICE_FQDN = "serviceFqdn";
 
     private static final String MISSING_MESSAGE = " is required in KubevirtApiConfig";
 
@@ -79,6 +80,10 @@
             }
         }
 
+        if (entity.serviceFqdn() != null) {
+            node.put(SERVICE_FQDN, entity.serviceFqdn());
+        }
+
         return node;
     }
 
@@ -104,6 +109,7 @@
         JsonNode caCertDataJson = json.get(CA_CERT_DATA);
         JsonNode clientCertDataJson = json.get(CLIENT_CERT_DATA);
         JsonNode clientKeyDataJson = json.get(CLIENT_KEY_DATA);
+        JsonNode serviceFqdn = json.get(SERVICE_FQDN);
 
         String token = "";
         String caCertData = "";
@@ -156,6 +162,10 @@
             builder.clientKeyData(clientKeyData);
         }
 
+        if (serviceFqdn != null) {
+            builder.serviceFqdn(serviceFqdn.asText());
+        }
+
         return builder.build();
     }
 }
diff --git a/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/impl/DefaultKubevirtNodeHandler.java b/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/impl/DefaultKubevirtNodeHandler.java
index b9c0880..86fa27d 100644
--- a/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/impl/DefaultKubevirtNodeHandler.java
+++ b/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/impl/DefaultKubevirtNodeHandler.java
@@ -99,6 +99,7 @@
 import static org.onosproject.kubevirtnode.util.KubevirtNodeUtil.getBooleanProperty;
 import static org.onosproject.kubevirtnode.util.KubevirtNodeUtil.getOvsdbClient;
 import static org.onosproject.kubevirtnode.util.KubevirtNodeUtil.isOvsdbConnected;
+import static org.onosproject.kubevirtnode.util.KubevirtNodeUtil.resolveHostname;
 import static org.onosproject.kubevirtnode.util.KubevirtNodeUtil.structurePortName;
 import static org.onosproject.net.AnnotationKeys.PORT_NAME;
 import static org.slf4j.LoggerFactory.getLogger;
@@ -123,6 +124,7 @@
     private static final long SLEEP_SHORT_MS = 1000; // we wait 1s
     private static final long SLEEP_MID_MS = 2000; // we wait 2s
     private static final long SLEEP_LONG_MS = 5000; // we wait 5s
+    private static final IpAddress DNS_SERVER_IP = IpAddress.valueOf("169.254.25.10");
 
     @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected CoreService coreService;
@@ -298,7 +300,20 @@
     private void createBridge(KubevirtNode node, String bridgeName, DeviceId devId) {
         Device device = deviceService.getDevice(node.ovsdb());
 
-        IpAddress serverIp = apiConfigService.apiConfig().ipAddress();
+        IpAddress serverIp;
+        String serviceFqdn = apiConfigService.apiConfig().serviceFqdn();
+        IpAddress serviceIp = null;
+
+        if (serviceFqdn != null) {
+            serviceIp = resolveHostname(serviceFqdn);
+        }
+
+        if (serviceIp != null) {
+            serverIp = serviceIp;
+        } else {
+            serverIp = apiConfigService.apiConfig().ipAddress();
+        }
+
         ControllerInfo controlInfo = new ControllerInfo(serverIp, DEFAULT_OFPORT, DEFAULT_OF_PROTO);
         List<ControllerInfo> controllers = Lists.newArrayList(controlInfo);
 
diff --git a/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/util/KubevirtNodeUtil.java b/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/util/KubevirtNodeUtil.java
index a4b0abb..839695f 100644
--- a/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/util/KubevirtNodeUtil.java
+++ b/apps/kubevirt-node/app/src/main/java/org/onosproject/kubevirtnode/util/KubevirtNodeUtil.java
@@ -44,8 +44,11 @@
 import org.onosproject.ovsdb.controller.OvsdbNodeId;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.xbill.DNS.Address;
 
 import java.io.IOException;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
 import java.util.Dictionary;
 import java.util.HashSet;
 import java.util.List;
@@ -82,6 +85,7 @@
     private static final String INTERFACE_KEY = "interface";
 
     private static final int PORT_NAME_MAX_LENGTH = 15;
+    private static final int DNS_DEFAULT_PORT = 53;
 
     /**
      * Prevents object installation from external.
@@ -385,4 +389,20 @@
                 .gatewayBridgeName(gatewayBridgeName)
                 .build();
     }
+
+    /**
+     * Resolve a DNS with the given DNS server and hostname.
+     *
+     * @param hostname      hostname to be resolved
+     * @return resolved IP address
+     */
+    public static IpAddress resolveHostname(String hostname) {
+        try {
+            InetAddress addr = Address.getByName(hostname);
+            return IpAddress.valueOf(IpAddress.Version.INET, addr.getAddress());
+        } catch (UnknownHostException e) {
+            log.warn("Failed to resolve IP address of host {}", hostname);
+        }
+        return null;
+    }
 }
diff --git a/apps/kubevirt-node/app/src/test/java/org/onosproject/kubevirtnode/codec/KubevirtApiConfigCodecTest.java b/apps/kubevirt-node/app/src/test/java/org/onosproject/kubevirtnode/codec/KubevirtApiConfigCodecTest.java
index 773401e..bd1c62b 100644
--- a/apps/kubevirt-node/app/src/test/java/org/onosproject/kubevirtnode/codec/KubevirtApiConfigCodecTest.java
+++ b/apps/kubevirt-node/app/src/test/java/org/onosproject/kubevirtnode/codec/KubevirtApiConfigCodecTest.java
@@ -86,6 +86,7 @@
                 .caCertData("caCertData")
                 .clientCertData("clientCertData")
                 .clientKeyData("clientKeyData")
+                .serviceFqdn("kubevirt.edgestack.svc.cluster.local")
                 .build();
         ObjectNode configJson = kubevirtApiConfigCodec.encode(config, context);
         assertThat(configJson, matchesKubevirtApiConfig(config));
@@ -107,6 +108,7 @@
         assertEquals("caCertData", config.caCertData());
         assertEquals("clientCertData", config.clientCertData());
         assertEquals("clientKeyData", config.clientKeyData());
+        assertEquals("kubevirt.edgestack.svc.cluster.local", config.serviceFqdn());
     }
 
     private KubevirtApiConfig getKubevirtApiConfig(String resourceName) throws IOException {
diff --git a/apps/kubevirt-node/app/src/test/java/org/onosproject/kubevirtnode/codec/KubevirtApiConfigJsonMatcher.java b/apps/kubevirt-node/app/src/test/java/org/onosproject/kubevirtnode/codec/KubevirtApiConfigJsonMatcher.java
index 17df9bc..1372d7d 100644
--- a/apps/kubevirt-node/app/src/test/java/org/onosproject/kubevirtnode/codec/KubevirtApiConfigJsonMatcher.java
+++ b/apps/kubevirt-node/app/src/test/java/org/onosproject/kubevirtnode/codec/KubevirtApiConfigJsonMatcher.java
@@ -35,6 +35,7 @@
     private static final String CA_CERT_DATA = "caCertData";
     private static final String CLIENT_CERT_DATA = "clientCertData";
     private static final String CLIENT_KEY_DATA = "clientKeyData";
+    private static final String SERVICE_FQDN = "serviceFqdn";
 
     private KubevirtApiConfigJsonMatcher(KubevirtApiConfig kubevirtApiConfig) {
         this.kubevirtApiConfig = kubevirtApiConfig;
@@ -118,6 +119,17 @@
             }
         }
 
+        // service FQDN
+        JsonNode jsonServiceFqdn = jsonNode.get(SERVICE_FQDN);
+        String serviceFqdn = kubevirtApiConfig.serviceFqdn();
+
+        if (jsonServiceFqdn != null) {
+            if (!jsonServiceFqdn.asText().equals(serviceFqdn)) {
+                description.appendText("serviceFqdn was " + jsonServiceFqdn);
+                return false;
+            }
+        }
+
         return true;
     }
 
diff --git a/apps/kubevirt-node/app/src/test/resources/org/onosproject/kubevirtnode/codec/KubevirtApiConfig.json b/apps/kubevirt-node/app/src/test/resources/org/onosproject/kubevirtnode/codec/KubevirtApiConfig.json
index f706cc3..b42e618 100644
--- a/apps/kubevirt-node/app/src/test/resources/org/onosproject/kubevirtnode/codec/KubevirtApiConfig.json
+++ b/apps/kubevirt-node/app/src/test/resources/org/onosproject/kubevirtnode/codec/KubevirtApiConfig.json
@@ -5,5 +5,6 @@
   "token": "token",
   "caCertData": "caCertData",
   "clientCertData": "clientCertData",
-  "clientKeyData": "clientKeyData"
+  "clientKeyData": "clientKeyData",
+  "serviceFqdn": "kubevirt.edgestack.svc.cluster.local"
 }
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