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/*-
* #%L
* athena-jdbc
* %%
* Copyright (C) 2019 Amazon Web Services
* %%
* 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.
* #L%
*/
package com.amazonaws.athena.connectors.jdbc;
import com.amazonaws.athena.connector.lambda.QueryStatusChecker;
import com.amazonaws.athena.connector.lambda.data.BlockAllocator;
import com.amazonaws.athena.connector.lambda.data.BlockWriter;
import com.amazonaws.athena.connector.lambda.metadata.GetDataSourceCapabilitiesRequest;
import com.amazonaws.athena.connector.lambda.metadata.GetDataSourceCapabilitiesResponse;
import com.amazonaws.athena.connector.lambda.metadata.GetSplitsRequest;
import com.amazonaws.athena.connector.lambda.metadata.GetSplitsResponse;
import com.amazonaws.athena.connector.lambda.metadata.GetTableLayoutRequest;
import com.amazonaws.athena.connector.lambda.metadata.GetTableLayoutResponse;
import com.amazonaws.athena.connector.lambda.metadata.GetTableRequest;
import com.amazonaws.athena.connector.lambda.metadata.GetTableResponse;
import com.amazonaws.athena.connector.lambda.metadata.ListSchemasRequest;
import com.amazonaws.athena.connector.lambda.metadata.ListSchemasResponse;
import com.amazonaws.athena.connector.lambda.metadata.ListTablesRequest;
import com.amazonaws.athena.connector.lambda.metadata.ListTablesResponse;
import com.amazonaws.athena.connectors.jdbc.connection.DatabaseConnectionConfig;
import com.amazonaws.athena.connectors.jdbc.connection.JdbcConnectionFactory;
import com.amazonaws.athena.connectors.jdbc.manager.JDBCUtil;
import com.amazonaws.athena.connectors.jdbc.manager.JdbcMetadataHandler;
import com.amazonaws.athena.connectors.jdbc.manager.JdbcMetadataHandlerFactory;
import com.amazonaws.services.athena.AmazonAthena;
import com.amazonaws.services.secretsmanager.AWSSecretsManager;
import org.apache.arrow.vector.types.pojo.Schema;
import org.apache.commons.lang3.Validate;
import java.util.Map;
/**
* Metadata handler multiplexer that supports multiple engines e.g. MySQL, PostGreSql and Redshift in same Lambda.
*
* Uses catalog name and associations to database types to route operations.
*/
public class MultiplexingJdbcMetadataHandler
extends JdbcMetadataHandler
{
private static final int MAX_CATALOGS_TO_MULTIPLEX = 100;
protected Map metadataHandlerMap;
static final String CATALOG_NOT_REGISTERED_ERROR_TEMPLATE = "Catalog is not supported in multiplexer. After registering the catalog in Athena, must set " +
"'%s_connection_string' environment variable in Lambda. See JDBC connector README for further details.";
/**
* @param metadataHandlerMap catalog -> JdbcMetadataHandler
*/
protected MultiplexingJdbcMetadataHandler(
AWSSecretsManager secretsManager,
AmazonAthena athena,
JdbcConnectionFactory jdbcConnectionFactory,
Map metadataHandlerMap,
DatabaseConnectionConfig databaseConnectionConfig,
java.util.Map configOptions)
{
super(databaseConnectionConfig, secretsManager, athena, jdbcConnectionFactory, configOptions);
this.metadataHandlerMap = Validate.notEmpty(metadataHandlerMap, "metadataHandlerMap must not be empty");
if (this.metadataHandlerMap.size() > MAX_CATALOGS_TO_MULTIPLEX) {
throw new RuntimeException("Max 100 catalogs supported in multiplexer.");
}
}
/**
* Initializes mux routing map. Creates a reverse index of Athena catalogs supported by a database instance. Max 100 catalogs supported currently.
*/
protected MultiplexingJdbcMetadataHandler(JdbcMetadataHandlerFactory jdbcMetadataHandlerFactory, java.util.Map configOptions)
{
super(jdbcMetadataHandlerFactory.getEngine(), configOptions);
this.metadataHandlerMap = Validate.notEmpty(JDBCUtil.createJdbcMetadataHandlerMap(configOptions, jdbcMetadataHandlerFactory), "Could not find any delegatee.");
}
private void validateMultiplexer(final String catalogName)
{
if (this.metadataHandlerMap.get(catalogName) == null) {
throw new RuntimeException(String.format(CATALOG_NOT_REGISTERED_ERROR_TEMPLATE, catalogName));
}
}
@Override
public Schema getPartitionSchema(final String catalogName)
{
validateMultiplexer(catalogName);
return this.metadataHandlerMap.get(catalogName).getPartitionSchema(catalogName);
}
@Override
public ListSchemasResponse doListSchemaNames(BlockAllocator blockAllocator, ListSchemasRequest listSchemasRequest)
throws Exception
{
validateMultiplexer(listSchemasRequest.getCatalogName());
return this.metadataHandlerMap.get(listSchemasRequest.getCatalogName()).doListSchemaNames(blockAllocator, listSchemasRequest);
}
@Override
public ListTablesResponse doListTables(BlockAllocator blockAllocator, ListTablesRequest listTablesRequest)
throws Exception
{
validateMultiplexer(listTablesRequest.getCatalogName());
return this.metadataHandlerMap.get(listTablesRequest.getCatalogName()).doListTables(blockAllocator, listTablesRequest);
}
@Override
public GetTableResponse doGetTable(BlockAllocator blockAllocator, GetTableRequest getTableRequest)
throws Exception
{
validateMultiplexer(getTableRequest.getCatalogName());
return this.metadataHandlerMap.get(getTableRequest.getCatalogName()).doGetTable(blockAllocator, getTableRequest);
}
@Override
public GetTableResponse doGetQueryPassthroughSchema(final BlockAllocator blockAllocator, final GetTableRequest getTableRequest)
throws Exception
{
validateMultiplexer(getTableRequest.getCatalogName());
return this.metadataHandlerMap.get(getTableRequest.getCatalogName()).doGetQueryPassthroughSchema(blockAllocator, getTableRequest);
}
@Override
public void getPartitions(final BlockWriter blockWriter, final GetTableLayoutRequest getTableLayoutRequest, QueryStatusChecker queryStatusChecker)
throws Exception
{
validateMultiplexer(getTableLayoutRequest.getCatalogName());
this.metadataHandlerMap.get(getTableLayoutRequest.getCatalogName()).getPartitions(blockWriter, getTableLayoutRequest, queryStatusChecker);
}
@Override
public GetTableLayoutResponse doGetTableLayout(BlockAllocator blockAllocator, GetTableLayoutRequest getTableLayoutRequest)
throws Exception
{
validateMultiplexer(getTableLayoutRequest.getCatalogName());
return this.metadataHandlerMap.get(getTableLayoutRequest.getCatalogName()).doGetTableLayout(blockAllocator, getTableLayoutRequest);
}
@Override
public GetSplitsResponse doGetSplits(
final BlockAllocator blockAllocator, final GetSplitsRequest getSplitsRequest)
{
validateMultiplexer(getSplitsRequest.getCatalogName());
return this.metadataHandlerMap.get(getSplitsRequest.getCatalogName()).doGetSplits(blockAllocator, getSplitsRequest);
}
@Override
public GetDataSourceCapabilitiesResponse doGetDataSourceCapabilities(BlockAllocator allocator, GetDataSourceCapabilitiesRequest request)
{
validateMultiplexer(request.getCatalogName());
return this.metadataHandlerMap.get(request.getCatalogName()).doGetDataSourceCapabilities(allocator, request);
}
}
