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Trino - Kafka Connector
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/*
 * 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 io.trino.plugin.kafka;

import com.google.common.collect.ImmutableMap;
import com.google.inject.Inject;
import io.trino.decoder.DispatchingRowDecoderFactory;
import io.trino.decoder.RowDecoder;
import io.trino.decoder.RowDecoderSpec;
import io.trino.spi.connector.ColumnHandle;
import io.trino.spi.connector.ConnectorRecordSetProvider;
import io.trino.spi.connector.ConnectorSession;
import io.trino.spi.connector.ConnectorSplit;
import io.trino.spi.connector.ConnectorTableHandle;
import io.trino.spi.connector.ConnectorTransactionHandle;
import io.trino.spi.connector.RecordSet;

import java.util.List;
import java.util.Map;
import java.util.Optional;

import static com.google.common.collect.ImmutableList.toImmutableList;
import static com.google.common.collect.ImmutableSet.toImmutableSet;
import static io.trino.decoder.avro.AvroRowDecoderFactory.DATA_SCHEMA;
import static java.util.Objects.requireNonNull;

public class KafkaRecordSetProvider
        implements ConnectorRecordSetProvider
{
    private final DispatchingRowDecoderFactory decoderFactory;
    private final KafkaConsumerFactory consumerFactory;
    private final KafkaInternalFieldManager kafkaInternalFieldManager;

    @Inject
    public KafkaRecordSetProvider(DispatchingRowDecoderFactory decoderFactory, KafkaConsumerFactory consumerFactory, KafkaInternalFieldManager kafkaInternalFieldManager)
    {
        this.decoderFactory = requireNonNull(decoderFactory, "decoderFactory is null");
        this.consumerFactory = requireNonNull(consumerFactory, "consumerFactory is null");
        this.kafkaInternalFieldManager = requireNonNull(kafkaInternalFieldManager, "kafkaInternalFieldManager is null");
    }

    @Override
    public RecordSet getRecordSet(ConnectorTransactionHandle transaction, ConnectorSession session, ConnectorSplit split, ConnectorTableHandle table, List columns)
    {
        KafkaSplit kafkaSplit = (KafkaSplit) split;

        List kafkaColumns = columns.stream()
                .map(KafkaColumnHandle.class::cast)
                .collect(toImmutableList());

        RowDecoder keyDecoder = decoderFactory.create(
                session,
                new RowDecoderSpec(
                        kafkaSplit.getKeyDataFormat(),
                        getDecoderParameters(kafkaSplit.getKeyDataSchemaContents()),
                        kafkaColumns.stream()
                                .filter(col -> !col.isInternal())
                                .filter(KafkaColumnHandle::isKeyCodec)
                                .collect(toImmutableSet())));

        RowDecoder messageDecoder = decoderFactory.create(
                session,
                new RowDecoderSpec(
                        kafkaSplit.getMessageDataFormat(),
                        getDecoderParameters(kafkaSplit.getMessageDataSchemaContents()),
                        kafkaColumns.stream()
                                .filter(col -> !col.isInternal())
                                .filter(col -> !col.isKeyCodec())
                                .collect(toImmutableSet())));

        return new KafkaRecordSet(kafkaSplit, consumerFactory, session, kafkaColumns, keyDecoder, messageDecoder, kafkaInternalFieldManager);
    }

    private static Map getDecoderParameters(Optional dataSchema)
    {
        ImmutableMap.Builder parameters = ImmutableMap.builder();
        dataSchema.ifPresent(schema -> parameters.put(DATA_SCHEMA, schema));
        return parameters.buildOrThrow();
    }
}