flink-connector-redis/src/test/java/org/apache/flink/streaming/connectors/redis/RedisSinkTest.java

/*
 * 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.
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package org.apache.flink.streaming.connectors.redis;

import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.connectors.redis.common.config.FlinkJedisClusterConfig;
import org.apache.flink.streaming.connectors.redis.common.config.FlinkJedisConfigBase;
import org.apache.flink.streaming.connectors.redis.common.config.FlinkJedisPoolConfig;
import org.apache.flink.streaming.connectors.redis.common.config.FlinkJedisSentinelConfig;
import org.apache.flink.streaming.connectors.redis.common.mapper.RedisCommand;
import org.apache.flink.streaming.connectors.redis.common.mapper.RedisCommandDescription;
import org.apache.flink.streaming.connectors.redis.common.mapper.RedisMapper;
import org.apache.flink.util.TestLogger;
import org.junit.Test;
import redis.clients.jedis.exceptions.JedisConnectionException;

import java.net.InetSocketAddress;
import java.util.HashSet;
import java.util.Set;


public class RedisSinkTest extends TestLogger {

    @Test(expected=NullPointerException.class)
    public void shouldThrowNullPointExceptionIfDataMapperIsNull(){
        new RedisSink<>(new FlinkJedisClusterConfig.Builder().build(), null);
    }

    @Test(expected = NullPointerException.class)
    public void shouldThrowNullPointerExceptionIfCommandDescriptionIsNull(){
        new RedisSink<>(new FlinkJedisClusterConfig.Builder().build(), new TestMapper(null));
    }

    @Test(expected = NullPointerException.class)
    public void shouldThrowNullPointerExceptionIfConfigurationIsNull(){
        new RedisSink<>(null, new TestMapper(new RedisCommandDescription(RedisCommand.LPUSH)));
    }

    @Test
    public void testRedisDownBehavior() throws Exception {

        // create a wrong configuration so that open() fails.

        FlinkJedisPoolConfig wrongJedisPoolConfig = new FlinkJedisPoolConfig.Builder()
            .setHost("127.0.0.1")
            .setPort(1234).build();

        testDownBehavior(wrongJedisPoolConfig);
    }

    @Test
    public void testRedisClusterDownBehavior() throws Exception {

        Set<InetSocketAddress> hosts = new HashSet<>();
        hosts.add(new InetSocketAddress("127.0.0.1", 1234));

        // create a wrong configuration so that open() fails.

        FlinkJedisClusterConfig wrongJedisClusterConfig = new FlinkJedisClusterConfig.Builder()
            .setNodes(hosts)
            .setTimeout(100)
            .setMaxIdle(1)
            .setMaxTotal(1)
            .setMinIdle(1).build();

        testDownBehavior(wrongJedisClusterConfig);
    }

    @Test
    public void testRedisSentinelDownBehavior() throws Exception {

        Set<String> hosts = new HashSet<>();
        hosts.add("localhost:55095");

        // create a wrong configuration so that open() fails.

        FlinkJedisSentinelConfig wrongJedisSentinelConfig = new FlinkJedisSentinelConfig.Builder()
            .setMasterName("master")
            .setSentinels(hosts)
            .build();

        testDownBehavior(wrongJedisSentinelConfig);
    }

    private void testDownBehavior(FlinkJedisConfigBase config) throws Exception {
        RedisSink<Tuple2<String, String>> redisSink = new RedisSink<>(config,
            new RedisSinkITCase.RedisCommandMapper(RedisCommand.SADD));

        try {
            redisSink.open(new Configuration());
        } catch (Exception e) {

            // search for nested JedisConnectionExceptions
            // because this is the expected behavior

            Throwable t = e;
            int depth = 0;
            while (!(t instanceof JedisConnectionException)) {
                t = t.getCause();
                if (t == null || depth++ == 20) {
                    throw e;
                }
            }
        }
    }

    private class TestMapper implements RedisMapper<Tuple2<String, String>> {
        private RedisCommandDescription redisCommandDescription;

        TestMapper(RedisCommandDescription redisCommandDescription){
            this.redisCommandDescription = redisCommandDescription;
        }
        @Override
        public RedisCommandDescription getCommandDescription() {
            return redisCommandDescription;
        }

        @Override
        public String getKeyFromData(Tuple2<String, String> data) {
            return data.f0;
        }

        @Override
        public String getValueFromData(Tuple2<String, String> data) {
            return data.f1;
        }
    }
}