com.hazelcast.jet.cdc.impl.ChangeRecordCdcSource Maven / Gradle / Ivy

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/*
 * Copyright (c) 2008-2020, Hazelcast, Inc. All Rights Reserved.
 *
 * Licensed 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 com.hazelcast.jet.cdc.impl;

import com.hazelcast.jet.cdc.ChangeRecord;
import com.hazelcast.jet.core.Processor;
import com.hazelcast.jet.pipeline.SourceBuilder;
import com.hazelcast.jet.pipeline.StreamSource;
import io.debezium.transforms.ExtractNewRecordState;
import org.apache.kafka.connect.data.Values;
import org.apache.kafka.connect.source.SourceRecord;

import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

import static com.hazelcast.jet.impl.util.ExceptionUtil.rethrow;

public class ChangeRecordCdcSource extends CdcSource {

    public static final String DB_SPECIFIC_EXTRA_FIELDS_PROPERTY = "db.specific.extra.fields";

    private final SequenceExtractor sequenceExtractor;
    private final ExtractNewRecordState transform;

    public ChangeRecordCdcSource(Processor.Context context, Properties properties) {
        super(context, properties);
        try {
            sequenceExtractor = newInstance(properties.getProperty(SEQUENCE_EXTRACTOR_CLASS_PROPERTY),
                    "sequence extractor ");
            transform = initTransform(properties.getProperty(DB_SPECIFIC_EXTRA_FIELDS_PROPERTY));
        } catch (Exception e) {
            throw rethrow(e);
        }
    }

    @Override
    protected ChangeRecord mapToOutput(SourceRecord record) {
        record = transform.apply(record);
        if (record == null) {
            return null;
        }

        long sequenceSource = sequenceExtractor.source(record.sourcePartition(), record.sourceOffset());
        long sequenceValue = sequenceExtractor.sequence(record.sourceOffset());
        String keyJson = Values.convertToString(record.keySchema(), record.key());
        String valueJson = Values.convertToString(record.valueSchema(), record.value());
        return new ChangeRecordImpl(sequenceSource, sequenceValue, keyJson, valueJson);
    }

    public static StreamSource fromProperties(Properties properties) {
        String name = properties.getProperty("name");
        return SourceBuilder.timestampedStream(name, ctx -> new ChangeRecordCdcSource(ctx, properties))
                .fillBufferFn(ChangeRecordCdcSource::fillBuffer)
                .createSnapshotFn(CdcSource::createSnapshot)
                .restoreSnapshotFn(CdcSource::restoreSnapshot)
                .destroyFn(CdcSource::destroy)
                .build();
    }

    private static ExtractNewRecordState initTransform(String dbSpecificExtraFields) {
        ExtractNewRecordState transform = new ExtractNewRecordState<>();

        Map config = new HashMap<>();
        config.put("add.fields", String.join(",", extraFields(dbSpecificExtraFields)));
        config.put("delete.handling.mode", "rewrite");
        transform.configure(config);

        return transform;
    }

    private static Collection extraFields(String dbSpecificExtraFields) {
        Set extraFields = new HashSet<>(Arrays.asList("db", "table", "op", "ts_ms"));
        if (dbSpecificExtraFields != null) {
            extraFields.addAll(Arrays.asList(dbSpecificExtraFields.split(",")));
        }
        return extraFields;
    }
}