feat: reset mqtt3 client on config change

src/integrationtests/java/com/aws/greengrass/integrationtests/ConfigTest.java

@@ -6,7 +6,6 @@
 package com.aws.greengrass.integrationtests;
 
 import com.aws.greengrass.config.Topics;
-import com.aws.greengrass.config.UpdateBehaviorTree;
 import com.aws.greengrass.dependency.State;
 import com.aws.greengrass.integrationtests.extensions.BridgeIntegrationTest;
 import com.aws.greengrass.integrationtests.extensions.BridgeIntegrationTestContext;
@@ -38,12 +37,10 @@
 import java.util.Set;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CountDownLatch;
-import java.util.concurrent.Semaphore;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.function.Consumer;
-import java.util.function.Supplier;
 
 import static com.github.grantwest.eventually.EventuallyLambdaMatcher.eventuallyEval;
 import static com.aws.greengrass.componentmanager.KernelConfigResolver.CONFIGURATION_CONFIG_KEY;
@@ -61,8 +58,6 @@
 public class ConfigTest {
     private static final long AWAIT_TIMEOUT_SECONDS = 30L;
     private static final long RECEIVE_PUBLISH_SECONDS = 2L;
-    private static final Supplier<UpdateBehaviorTree> MERGE_UPDATE_BEHAVIOR =
-            () -> new UpdateBehaviorTree(UpdateBehaviorTree.UpdateBehavior.MERGE, System.currentTimeMillis());
 
     BridgeIntegrationTestContext testContext;
 
@@ -180,50 +175,6 @@ void GIVEN_Greengrass_with_mqtt_bridge_WHEN_connect_options_set_in_config_THEN_l
                 () -> largeMessageHandler.getLeft().get(RECEIVE_PUBLISH_SECONDS, TimeUnit.SECONDS));
     }
 
-    @BridgeIntegrationTest(
-            withConfig = "config.yaml",
-            withBrokers = Broker.MQTT3)
-    void GIVEN_Greengrass_with_mqtt_bridge_WHEN_multiple_serialized_config_changes_occur_THEN_bridge_reinstalls_multiple_times(ExtensionContext context) throws Exception {
-        ignoreExceptionOfType(context, InterruptedException.class);
-
-        Semaphore bridgeRestarted = new Semaphore(1);
-        bridgeRestarted.acquire();
-
-        testContext.getKernel().getContext().addGlobalStateChangeListener((GreengrassService service, State was, State newState) -> {
-            if (service.getName().equals(MQTTBridge.SERVICE_NAME) && newState.equals(State.RUNNING)) {
-                bridgeRestarted.release();
-            }
-        });
-
-        Topics config = testContext.getKernel().locate(MQTTBridge.SERVICE_NAME).getConfig()
-                .lookupTopics(CONFIGURATION_CONFIG_KEY);
-
-        int numRestarts = 5;
-        for (int i = 0; i < numRestarts; i++) {
-            // change the configuration and wait for bridge to restart
-            config.updateFromMap(Utils.immutableMap(BridgeConfig.KEY_CLIENT_ID, String.format("clientId%d", i)), MERGE_UPDATE_BEHAVIOR.get());
-            assertTrue(bridgeRestarted.tryAcquire(AWAIT_TIMEOUT_SECONDS, TimeUnit.SECONDS));
-        }
-    }
-
-    @BridgeIntegrationTest(
-            withConfig = "config.yaml",
-            withBrokers = Broker.MQTT3)
-    void GIVEN_Greengrass_with_mqtt_bridge_WHEN_clientId_config_changes_THEN_bridge_reinstalls() throws Exception {
-        CountDownLatch bridgeRestarted = new CountDownLatch(1);
-        testContext.getKernel().getContext().addGlobalStateChangeListener((GreengrassService service, State was, State newState) -> {
-            if (service.getName().equals(MQTTBridge.SERVICE_NAME) && newState.equals(State.NEW)) {
-                bridgeRestarted.countDown();
-            }
-        });
-
-        Topics config = testContext.getKernel().locate(MQTTBridge.SERVICE_NAME).getConfig()
-                .lookupTopics(CONFIGURATION_CONFIG_KEY);
-        config.updateFromMap(Utils.immutableMap(BridgeConfig.KEY_CLIENT_ID, "new_client_id"), MERGE_UPDATE_BEHAVIOR.get());
-
-        assertTrue(bridgeRestarted.await(AWAIT_TIMEOUT_SECONDS, TimeUnit.SECONDS));
-    }
-
     @BridgeIntegrationTest(
             withConfig = "config.yaml",
             withBrokers = Broker.MQTT3)

src/integrationtests/java/com/aws/greengrass/integrationtests/KeystoreTest.java

@@ -9,13 +9,9 @@
 import com.aws.greengrass.clientdevices.auth.certificate.CertificateHelper;
 import com.aws.greengrass.clientdevices.auth.certificate.CertificateStore;
 import com.aws.greengrass.config.Topic;
-import com.aws.greengrass.dependency.State;
 import com.aws.greengrass.integrationtests.extensions.BridgeIntegrationTest;
 import com.aws.greengrass.integrationtests.extensions.BridgeIntegrationTestContext;
 import com.aws.greengrass.integrationtests.extensions.Broker;
-import com.aws.greengrass.lifecyclemanager.GlobalStateChangeListener;
-import com.aws.greengrass.lifecyclemanager.GreengrassService;
-import com.aws.greengrass.mqtt.bridge.BridgeConfig;
 import com.aws.greengrass.mqtt.bridge.MQTTBridge;
 import com.aws.greengrass.mqtt.bridge.auth.MQTTClientKeyStore;
 import com.aws.greengrass.mqtt.bridge.model.MqttVersion;
@@ -41,7 +37,6 @@
 import java.util.function.Consumer;
 import java.util.stream.IntStream;
 
-import static com.aws.greengrass.componentmanager.KernelConfigResolver.CONFIGURATION_CONFIG_KEY;
 import static com.aws.greengrass.lifecyclemanager.GreengrassService.RUNTIME_STORE_NAMESPACE_TOPIC;
 import static com.aws.greengrass.lifecyclemanager.GreengrassService.SERVICES_NAMESPACE_TOPIC;
 import static com.aws.greengrass.testcommons.testutilities.ExceptionLogProtector.ignoreExceptionOfType;
@@ -154,22 +149,8 @@ void GIVEN_mqtt_bridge_WHEN_cda_ca_conf_changed_after_shutdown_THEN_bridge_keyst
         ignoreExceptionOfType(context, IllegalArgumentException.class);
         ignoreExceptionOfType(context, NullPointerException.class);
 
-        // break bridge
-        CountDownLatch bridgeIsBroken = new CountDownLatch(1);
-        GlobalStateChangeListener listener = (GreengrassService service, State was, State newState) -> {
-            if (service.getName().equals(MQTTBridge.SERVICE_NAME) && service.getState().equals(State.BROKEN)) {
-                bridgeIsBroken.countDown();
-            }
-        };
-        Topic brokerUriTopic = testContext.getKernel().getConfig().lookup(
-                SERVICES_NAMESPACE_TOPIC,
-                MQTTBridge.SERVICE_NAME,
-                CONFIGURATION_CONFIG_KEY,
-                BridgeConfig.KEY_BROKER_URI
-        );
-        brokerUriTopic.withValue("garbage");
-        testContext.getKernel().getContext().addGlobalStateChangeListener(listener);
-        assertTrue(bridgeIsBroken.await(AWAIT_TIMEOUT_SECONDS, TimeUnit.SECONDS));
+        // shutdown the bridge
+        testContext.getFromContext(MQTTBridge.class).shutdown();
 
         CountDownLatch keyStoreUpdated = new CountDownLatch(1);
         MQTTClientKeyStore keyStore = testContext.getKernel().getContext().get(MQTTClientKeyStore.class);
@@ -191,8 +172,8 @@ void GIVEN_mqtt_bridge_WHEN_cda_ca_conf_changed_after_shutdown_THEN_bridge_keyst
                                 Date.from(Instant.now().plusSeconds(100)),
                                 "CA"))));
 
-        // shouldn't update
-        assertFalse(keyStoreUpdated.await(AWAIT_TIMEOUT_SECONDS, TimeUnit.SECONDS));
+        testContext.getKernel().getContext().waitForPublishQueueToClear();
+        assertFalse(keyStoreUpdated.await(5L, TimeUnit.SECONDS));
     }
 
     private CompletableFuture<Void> asyncAssertNumConnects(Integer numConnects) throws InterruptedException {

src/main/java/com/aws/greengrass/mqtt/bridge/MQTTBridge.java

@@ -17,10 +17,9 @@
 import com.aws.greengrass.lifecyclemanager.PluginService;
 import com.aws.greengrass.lifecyclemanager.exceptions.ServiceLoadException;
 import com.aws.greengrass.mqtt.bridge.auth.MQTTClientKeyStore;
+import com.aws.greengrass.mqtt.bridge.clients.Configurable;
 import com.aws.greengrass.mqtt.bridge.clients.IoTCoreClient;
-import com.aws.greengrass.mqtt.bridge.clients.LocalMqtt5Client;
 import com.aws.greengrass.mqtt.bridge.clients.LocalMqttClientFactory;
-import com.aws.greengrass.mqtt.bridge.clients.MQTTClient;
 import com.aws.greengrass.mqtt.bridge.clients.MessageClient;
 import com.aws.greengrass.mqtt.bridge.clients.MessageClientException;
 import com.aws.greengrass.mqtt.bridge.clients.PubSubClient;
@@ -295,17 +294,14 @@ public class ConfigurationChangeHandler {
                 return;
             }
 
-            // TODO same for MQTT3 client
-            if (localMqttClient instanceof LocalMqtt5Client) {
-                ((LocalMqtt5Client) localMqttClient).applyConfig(LocalMqtt5Client.Config.fromBridgeConfig(newConfig));
+            if (localMqttClient instanceof Configurable) {
+                ((Configurable) localMqttClient).applyConfig(newConfig);
             }
         });
 
         private boolean reinstallRequired(BridgeConfig prevConfig, BridgeConfig newConfig) {
-            return !Objects.equals(prevConfig.getMqttVersion(), newConfig.getMqttVersion()) // to switch between clients
-                    || localMqttClient instanceof MQTTClient
-                    && (!Objects.equals(prevConfig.getBrokerUri(), newConfig.getBrokerUri())
-                    || !Objects.equals(prevConfig.getClientId(), newConfig.getClientId()));
+            // to switch between clients
+            return !Objects.equals(prevConfig.getMqttVersion(), newConfig.getMqttVersion());
         }
 
         /**

src/main/java/com/aws/greengrass/mqtt/bridge/clients/Configurable.java

@@ -0,0 +1,13 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package com.aws.greengrass.mqtt.bridge.clients;
+
+import com.aws.greengrass.mqtt.bridge.BridgeConfig;
+
+@FunctionalInterface
+public interface Configurable {
+    void applyConfig(BridgeConfig config);
+}

src/main/java/com/aws/greengrass/mqtt/bridge/clients/LocalMqtt5Client.java

@@ -68,7 +68,7 @@
 import static com.aws.greengrass.mqtt.bridge.model.Mqtt5RouteOptions.DEFAULT_NO_LOCAL;
 
 @SuppressWarnings("PMD.CloseResource")
-public class LocalMqtt5Client implements MessageClient<MqttMessage> {
+public class LocalMqtt5Client implements MessageClient<MqttMessage>, Configurable {
 
     private static final Logger LOGGER = LogManager.getLogger(LocalMqtt5Client.class);
 
@@ -334,11 +334,16 @@ public static boolean resetRequired(Config prevConfig, Config newConfig) {
      * Apply new configuration to this client. Depending on what configurations changed, a
      * {@link LocalMqtt5Client#reset()} may occur to apply them.
      *
-     * @param config new configuration
+     * @param bridgeConfig new bridge configuration
      */
-    public void applyConfig(@NonNull Config config) {
+    @Override
+    public void applyConfig(@NonNull BridgeConfig bridgeConfig) {
+        applyConfig(Config.fromBridgeConfig(bridgeConfig));
+    }
+
+    void applyConfig(Config newConfig) {
         Config previousConfig = this.config;
-        this.config = config;
+        this.config = newConfig;
         if (Config.resetRequired(previousConfig, config)) {
             scheduleResetTask();
         }

src/main/java/com/aws/greengrass/mqtt/bridge/clients/LocalMqttClientFactory.java

@@ -63,8 +63,7 @@ public MessageClient<MqttMessage> createLocalMqttClient() throws MessageClientEx
             case MQTT3: // fall-through
             default:
                 return new MQTTClient(
-                        config.getBrokerUri(),
-                        config.getClientId(),
+                        config,
                         mqttClientKeyStore,
                         executorService
                 );