content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License. You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.kafka.connect.mirror;
  
  import org.apache.kafka.connect.errors.ConnectException;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.function.Function;
  
  import static org.apache.kafka.connect.mirror.Heartbeat.SOURCE_CLUSTER_ALIAS_KEY;
  import static org.apache.kafka.connect.mirror.Heartbeat.TARGET_CLUSTER_ALIAS_KEY;
  import static org.apache.kafka.connect.mirror.TestUtils.makeProps;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class MirrorHeartBeatConnectorTest {
  
      private static final Map<String, ?> SOURCE_OFFSET = MirrorUtils.wrapOffset(0);
  
      @Test
      public void testMirrorHeartbeatConnectorDisabled() {
          // disable the heartbeat emission
          MirrorHeartbeatConfig config = new MirrorHeartbeatConfig(
              makeProps("emit.heartbeats.enabled", "false"));
  
          // MirrorHeartbeatConnector as minimum to run taskConfig()
          MirrorHeartbeatConnector connector = new MirrorHeartbeatConnector(config);
          List<Map<String, String>> output = connector.taskConfigs(1);
          // expect no task will be created
          assertEquals(0, output.size(), "Expected task to not be created");
      }
  
      @Test
      public void testReplicationDisabled() {
          // disable the replication
          MirrorHeartbeatConfig config = new MirrorHeartbeatConfig(
              makeProps("enabled", "false"));
  
          // MirrorHeartbeatConnector as minimum to run taskConfig()
          MirrorHeartbeatConnector connector = new MirrorHeartbeatConnector(config);
          List<Map<String, String>> output = connector.taskConfigs(1);
          // expect one task will be created, even the replication is disabled
          assertEquals(1, output.size(), "Task should have been created even with replication disabled");
      }
  
      @Test
      public void testAlterOffsetsIncorrectPartitionKey() {
          MirrorHeartbeatConnector connector = new MirrorHeartbeatConnector();
          assertThrows(ConnectException.class, () -> connector.alterOffsets(null, Collections.singletonMap(
                  Collections.singletonMap("unused_partition_key", "unused_partition_value"),
                  SOURCE_OFFSET
          )));
  
          // null partitions are invalid
          assertThrows(ConnectException.class, () -> connector.alterOffsets(null, Collections.singletonMap(
                  null,
                  SOURCE_OFFSET
          )));
      }
  
      @Test
      public void testAlterOffsetsMissingPartitionKey() {
          MirrorHeartbeatConnector connector = new MirrorHeartbeatConnector();
  
          Function<Map<String, ?>, Boolean> alterOffsets = partition -> connector.alterOffsets(null, Collections.singletonMap(
                  partition,
                  SOURCE_OFFSET
          ));
  
          Map<String, ?> validPartition = sourcePartition("primary", "backup");
          // Sanity check to make sure our valid partition is actually valid
          assertTrue(alterOffsets.apply(validPartition));
  
          for (String key : Arrays.asList(SOURCE_CLUSTER_ALIAS_KEY, TARGET_CLUSTER_ALIAS_KEY)) {
              Map<String, ?> invalidPartition = new HashMap<>(validPartition);
              invalidPartition.remove(key);
              assertThrows(ConnectException.class, () -> alterOffsets.apply(invalidPartition));
          }
      }
  
      @Test
      public void testAlterOffsetsMultiplePartitions() {
          MirrorHeartbeatConnector connector = new MirrorHeartbeatConnector();
  
          Map<String, ?> partition1 = sourcePartition("primary", "backup");
          Map<String, ?> partition2 = sourcePartition("backup", "primary");
  
          Map<Map<String, ?>, Map<String, ?>> offsets = new HashMap<>();
          offsets.put(partition1, SOURCE_OFFSET);
          offsets.put(partition2, SOURCE_OFFSET);
  
          assertTrue(connector.alterOffsets(null, offsets));
      }
  
      @Test
      public void testAlterOffsetsIncorrectOffsetKey() {
          MirrorHeartbeatConnector connector = new MirrorHeartbeatConnector();
  
          Map<Map<String, ?>, Map<String, ?>> offsets = Collections.singletonMap(
                  sourcePartition("primary", "backup"),
                  Collections.singletonMap("unused_offset_key", 0)
          );
          assertThrows(ConnectException.class, () -> connector.alterOffsets(null, offsets));
      }
  
      @Test
      public void testAlterOffsetsOffsetValues() {
          MirrorHeartbeatConnector connector = new MirrorHeartbeatConnector();
  
          Function<Object, Boolean> alterOffsets = offset -> connector.alterOffsets(null, Collections.singletonMap(
                  sourcePartition("primary", "backup"),
                  Collections.singletonMap(MirrorUtils.OFFSET_KEY, offset)
          ));
  
          assertThrows(ConnectException.class, () -> alterOffsets.apply("nan"));
          assertThrows(ConnectException.class, () -> alterOffsets.apply(null));
          assertThrows(ConnectException.class, () -> alterOffsets.apply(new Object()));
          assertThrows(ConnectException.class, () -> alterOffsets.apply(3.14));
          assertThrows(ConnectException.class, () -> alterOffsets.apply(-420));
          assertThrows(ConnectException.class, () -> alterOffsets.apply("-420"));
          assertThrows(ConnectException.class, () -> alterOffsets.apply("10"));
          assertThrows(ConnectException.class, () -> alterOffsets.apply(10));
          assertThrows(ConnectException.class, () -> alterOffsets.apply(((long) Integer.MAX_VALUE) + 1));
          assertTrue(() -> alterOffsets.apply(0));
      }
  
      @Test
      public void testSuccessfulAlterOffsets() {
          MirrorHeartbeatConnector connector = new MirrorHeartbeatConnector();
  
          Map<Map<String, ?>, Map<String, ?>> offsets = Collections.singletonMap(
                  sourcePartition("primary", "backup"),
                  SOURCE_OFFSET
          );
  
          // Expect no exception to be thrown when a valid offsets map is passed. An empty offsets map is treated as valid
          // since it could indicate that the offsets were reset previously or that no offsets have been committed yet
          // (for a reset operation)
          assertTrue(connector.alterOffsets(null, offsets));
          assertTrue(connector.alterOffsets(null, Collections.emptyMap()));
      }
  
      @Test
      public void testAlterOffsetsTombstones() {
          MirrorHeartbeatConnector connector = new MirrorHeartbeatConnector();
  
          Function<Map<String, ?>, Boolean> alterOffsets = partition -> connector.alterOffsets(
                  null,
                  Collections.singletonMap(partition, null)
          );
  
          Map<String, Object> partition = sourcePartition("src", "bak");
          assertTrue(() -> alterOffsets.apply(partition));
          partition.put(SOURCE_CLUSTER_ALIAS_KEY, 618);
          assertTrue(() -> alterOffsets.apply(partition));
          partition.remove(SOURCE_CLUSTER_ALIAS_KEY);
          assertTrue(() -> alterOffsets.apply(partition));
  
          assertTrue(() -> alterOffsets.apply(null));
          assertTrue(() -> alterOffsets.apply(Collections.emptyMap()));
          assertTrue(() -> alterOffsets.apply(Collections.singletonMap("unused_partition_key", "unused_partition_value")));
      }
  
      private static Map<String, Object> sourcePartition(String sourceClusterAlias, String targetClusterAlias) {
          Map<String, Object> result = new HashMap<>();
          result.put(SOURCE_CLUSTER_ALIAS_KEY, sourceClusterAlias);
          result.put(TARGET_CLUSTER_ALIAS_KEY, targetClusterAlias);
          return result;
      }
  }
  