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com.amazonaws.athena.connectors.jdbc.manager.JdbcMetadataHandler Maven / Gradle / Ivy
/*-
* #%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.manager;
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.data.FieldBuilder;
import com.amazonaws.athena.connector.lambda.data.SchemaBuilder;
import com.amazonaws.athena.connector.lambda.data.SupportedTypes;
import com.amazonaws.athena.connector.lambda.domain.Split;
import com.amazonaws.athena.connector.lambda.domain.TableName;
import com.amazonaws.athena.connector.lambda.domain.spill.SpillLocation;
import com.amazonaws.athena.connector.lambda.handlers.MetadataHandler;
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.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.connection.JdbcCredentialProvider;
import com.amazonaws.athena.connectors.jdbc.connection.RdsSecretsCredentialProvider;
import com.amazonaws.athena.connectors.jdbc.qpt.JdbcQueryPassthrough;
import com.amazonaws.athena.connectors.jdbc.splits.Splitter;
import com.amazonaws.athena.connectors.jdbc.splits.SplitterFactory;
import com.amazonaws.services.athena.AmazonAthena;
import com.amazonaws.services.secretsmanager.AWSSecretsManager;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import org.apache.arrow.vector.types.pojo.ArrowType;
import org.apache.arrow.vector.types.pojo.Field;
import org.apache.arrow.vector.types.pojo.Schema;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;
import static com.amazonaws.athena.connector.lambda.metadata.ListTablesRequest.UNLIMITED_PAGE_SIZE_VALUE;
/**
* Abstracts JDBC metadata handler and provides common reusable metadata handling.
*/
public abstract class JdbcMetadataHandler
extends MetadataHandler
{
private static final Logger LOGGER = LoggerFactory.getLogger(JdbcMetadataHandler.class);
private static final String SQL_SPLITS_STRING = "select min(%s), max(%s) from %s.%s;";
private static final int DEFAULT_NUM_SPLITS = 20;
public static final String TABLES_AND_VIEWS = "Tables and Views";
private final JdbcConnectionFactory jdbcConnectionFactory;
private final DatabaseConnectionConfig databaseConnectionConfig;
private final SplitterFactory splitterFactory = new SplitterFactory();
protected JdbcQueryPassthrough jdbcQueryPassthrough = new JdbcQueryPassthrough();
/**
* Used only by Multiplexing handler. All calls will be delegated to respective database handler.
*/
protected JdbcMetadataHandler(String sourceType, java.util.Map configOptions)
{
super(sourceType, configOptions);
this.jdbcConnectionFactory = null;
this.databaseConnectionConfig = null;
}
protected JdbcMetadataHandler(
DatabaseConnectionConfig databaseConnectionConfig,
JdbcConnectionFactory jdbcConnectionFactory,
java.util.Map configOptions)
{
super(databaseConnectionConfig.getEngine(), configOptions);
this.jdbcConnectionFactory = Validate.notNull(jdbcConnectionFactory, "jdbcConnectionFactory must not be null");
this.databaseConnectionConfig = Validate.notNull(databaseConnectionConfig, "databaseConnectionConfig must not be null");
}
@VisibleForTesting
protected JdbcMetadataHandler(
DatabaseConnectionConfig databaseConnectionConfig,
AWSSecretsManager secretsManager,
AmazonAthena athena,
JdbcConnectionFactory jdbcConnectionFactory,
java.util.Map configOptions)
{
super(null, secretsManager, athena, databaseConnectionConfig.getEngine(), null, null, configOptions);
this.jdbcConnectionFactory = Validate.notNull(jdbcConnectionFactory, "jdbcConnectionFactory must not be null");
this.databaseConnectionConfig = Validate.notNull(databaseConnectionConfig, "databaseConnectionConfig must not be null");
}
protected JdbcConnectionFactory getJdbcConnectionFactory()
{
return jdbcConnectionFactory;
}
protected JdbcCredentialProvider getCredentialProvider()
{
final String secretName = databaseConnectionConfig.getSecret();
if (StringUtils.isNotBlank(secretName)) {
LOGGER.info("Using Secrets Manager.");
return new RdsSecretsCredentialProvider(getSecret(secretName));
}
return null;
}
@Override
public ListSchemasResponse doListSchemaNames(final BlockAllocator blockAllocator, final ListSchemasRequest listSchemasRequest)
throws Exception
{
try (Connection connection = jdbcConnectionFactory.getConnection(getCredentialProvider())) {
LOGGER.info("{}: List schema names for Catalog {}", listSchemasRequest.getQueryId(), listSchemasRequest.getCatalogName());
return new ListSchemasResponse(listSchemasRequest.getCatalogName(), listDatabaseNames(connection));
}
}
private Set listDatabaseNames(final Connection jdbcConnection)
throws SQLException
{
try (ResultSet resultSet = jdbcConnection.getMetaData().getSchemas()) {
ImmutableSet.Builder schemaNames = ImmutableSet.builder();
while (resultSet.next()) {
String schemaName = resultSet.getString("TABLE_SCHEM");
// skip internal schemas
if (!schemaName.equals("information_schema")) {
schemaNames.add(schemaName);
}
}
return schemaNames.build();
}
}
@Override
public ListTablesResponse doListTables(final BlockAllocator blockAllocator, final ListTablesRequest listTablesRequest)
throws Exception
{
try (Connection connection = jdbcConnectionFactory.getConnection(getCredentialProvider())) {
LOGGER.info("{}: List table names for Catalog {}, Schema {}", listTablesRequest.getQueryId(),
listTablesRequest.getCatalogName(), listTablesRequest.getSchemaName());
String token = listTablesRequest.getNextToken();
int pageSize = listTablesRequest.getPageSize();
if (pageSize == UNLIMITED_PAGE_SIZE_VALUE && token == null) { // perform no pagination
LOGGER.info("doListTables - NO pagination");
return new ListTablesResponse(listTablesRequest.getCatalogName(), listTables(connection, listTablesRequest.getSchemaName()), null);
}
LOGGER.info("doListTables - pagination");
return listPaginatedTables(connection, listTablesRequest);
}
}
protected ListTablesResponse listPaginatedTables(final Connection connection, final ListTablesRequest listTablesRequest) throws SQLException
{
// no-op is call listTables
// override this function to implement pagination
LOGGER.debug("Request is asking for pagination, but pagination has not been implemented");
return new ListTablesResponse(listTablesRequest.getCatalogName(),
listTables(connection, listTablesRequest.getSchemaName()), null);
}
protected List listTables(final Connection jdbcConnection, final String databaseName)
throws SQLException
{
try (ResultSet resultSet = getTables(jdbcConnection, databaseName)) {
ImmutableList.Builder list = ImmutableList.builder();
while (resultSet.next()) {
list.add(JDBCUtil.getSchemaTableName(resultSet));
}
return list.build();
}
}
private ResultSet getTables(final Connection connection, final String schemaName)
throws SQLException
{
DatabaseMetaData metadata = connection.getMetaData();
String escape = metadata.getSearchStringEscape();
return metadata.getTables(
connection.getCatalog(),
escapeNamePattern(schemaName, escape),
null,
new String[] {"TABLE", "VIEW", "EXTERNAL TABLE", "MATERIALIZED VIEW"});
}
protected String escapeNamePattern(final String name, final String escape)
{
if ((name == null) || (escape == null)) {
return name;
}
Preconditions.checkArgument(!escape.equals("_"), "Escape string must not be '_'");
Preconditions.checkArgument(!escape.equals("%"), "Escape string must not be '%'");
String escapedName = name.replace(escape, escape + escape);
escapedName = escapedName.replace("_", escape + "_");
escapedName = escapedName.replace("%", escape + "%");
return escapedName;
}
@Override
public GetTableResponse doGetTable(final BlockAllocator blockAllocator, final GetTableRequest getTableRequest)
throws Exception
{
try (Connection connection = jdbcConnectionFactory.getConnection(getCredentialProvider())) {
Schema partitionSchema = getPartitionSchema(getTableRequest.getCatalogName());
TableName caseInsensitiveTableMatch = caseInsensitiveTableSearch(connection, getTableRequest.getTableName().getSchemaName(),
getTableRequest.getTableName().getTableName());
Schema caseInsensitiveSchemaMatch = getSchema(connection, caseInsensitiveTableMatch, partitionSchema);
return new GetTableResponse(getTableRequest.getCatalogName(), caseInsensitiveTableMatch, caseInsensitiveSchemaMatch,
partitionSchema.getFields().stream().map(Field::getName).collect(Collectors.toSet()));
}
}
@Override
public GetTableResponse doGetQueryPassthroughSchema(final BlockAllocator blockAllocator, final GetTableRequest getTableRequest)
throws Exception
{
if (!getTableRequest.isQueryPassthrough()) {
throw new IllegalArgumentException("No Query passed through [{}]" + getTableRequest);
}
jdbcQueryPassthrough.verify(getTableRequest.getQueryPassthroughArguments());
String customerPassedQuery = getTableRequest.getQueryPassthroughArguments().get(JdbcQueryPassthrough.QUERY);
try (Connection connection = getJdbcConnectionFactory().getConnection(getCredentialProvider())) {
PreparedStatement preparedStatement = connection.prepareStatement(customerPassedQuery);
ResultSetMetaData metadata = preparedStatement.getMetaData();
if (metadata == null) {
throw new UnsupportedOperationException("Query not supported: ResultSetMetaData not available for query: " + customerPassedQuery);
}
SchemaBuilder schemaBuilder = SchemaBuilder.newBuilder();
for (int columnIndex = 1; columnIndex <= metadata.getColumnCount(); columnIndex++) {
String columnName = metadata.getColumnName(columnIndex);
String columnLabel = metadata.getColumnLabel(columnIndex);
//todo; is there a mechanism to pass both back to the engine?
columnName = columnName.equals(columnLabel) ? columnName : columnLabel;
int precision = metadata.getPrecision(columnIndex);
ArrowType columnType = convertDatasourceTypeToArrow(columnIndex, precision, configOptions, metadata);
if (columnType != null && SupportedTypes.isSupported(columnType)) {
if (columnType instanceof ArrowType.List) {
schemaBuilder.addListField(columnName, getArrayArrowTypeFromTypeName(
metadata.getTableName(columnIndex),
metadata.getColumnDisplaySize(columnIndex),
precision));
}
else {
schemaBuilder.addField(FieldBuilder.newBuilder(columnName, columnType).build());
}
}
else {
// Default to VARCHAR ArrowType
LOGGER.warn("getSchema: Unable to map type for column[" + columnName +
"] to a supported type, attempted " + columnType + " - defaulting type to VARCHAR.");
schemaBuilder.addField(FieldBuilder.newBuilder(columnName, new ArrowType.Utf8()).build());
}
}
Schema schema = schemaBuilder.build();
return new GetTableResponse(getTableRequest.getCatalogName(), getTableRequest.getTableName(), schema, Collections.emptySet());
}
}
/**
* A method that takes in a JDBC type; and converts it to Arrow Type
* This can be overriden by other Metadata Handlers extending JDBC
*
* @param columnIndex
* @param precision
* @param configOptions
* @param metadata
* @return Arrow Type
*/
protected ArrowType convertDatasourceTypeToArrow(int columnIndex, int precision, Map configOptions, ResultSetMetaData metadata) throws SQLException
{
int scale = metadata.getScale(columnIndex);
int columnType = metadata.getColumnType(columnIndex);
return JdbcArrowTypeConverter.toArrowType(
columnType,
precision,
scale,
configOptions);
}
/**
* While being a no-op by default, this function will be overriden by subclasses that support this search.
*
* @param connection
* @param databaseName
* @param tableName
* @return TableName containing the resolved case sensitive table name.
*/
protected TableName caseInsensitiveTableSearch(Connection connection, final String databaseName,
final String tableName) throws Exception
{
return new TableName(databaseName, tableName);
}
private Schema getSchema(Connection jdbcConnection, TableName tableName, Schema partitionSchema)
throws Exception
{
SchemaBuilder schemaBuilder = SchemaBuilder.newBuilder();
try (ResultSet resultSet = getColumns(jdbcConnection.getCatalog(), tableName, jdbcConnection.getMetaData())) {
boolean found = false;
while (resultSet.next()) {
ArrowType columnType = JdbcArrowTypeConverter.toArrowType(
resultSet.getInt("DATA_TYPE"),
resultSet.getInt("COLUMN_SIZE"),
resultSet.getInt("DECIMAL_DIGITS"),
configOptions);
String columnName = resultSet.getString("COLUMN_NAME");
if (columnType != null && SupportedTypes.isSupported(columnType)) {
if (columnType instanceof ArrowType.List) {
schemaBuilder.addListField(columnName, getArrayArrowTypeFromTypeName(
resultSet.getString("TYPE_NAME"),
resultSet.getInt("COLUMN_SIZE"),
resultSet.getInt("DECIMAL_DIGITS")));
}
else {
schemaBuilder.addField(FieldBuilder.newBuilder(columnName, columnType).build());
}
}
else {
// Default to VARCHAR ArrowType
LOGGER.warn("getSchema: Unable to map type for column[" + columnName +
"] to a supported type, attempted " + columnType + " - defaulting type to VARCHAR.");
schemaBuilder.addField(FieldBuilder.newBuilder(columnName, new ArrowType.Utf8()).build());
}
found = true;
}
if (!found) {
throw new RuntimeException(String.format("Could not find table %s in %s", tableName.getTableName(), tableName.getSchemaName()));
}
// add partition columns
partitionSchema.getFields().forEach(schemaBuilder::addField);
return schemaBuilder.build();
}
}
private ResultSet getColumns(final String catalogName, final TableName tableHandle, final DatabaseMetaData metadata)
throws SQLException
{
String escape = metadata.getSearchStringEscape();
return metadata.getColumns(
catalogName,
escapeNamePattern(tableHandle.getSchemaName(), escape),
escapeNamePattern(tableHandle.getTableName(), escape),
null);
}
/**
* Delegates creation of partition schema to database type implementation.
*
* @param catalogName Athena provided catalog name.
* @return schema. See {@link Schema}
*/
public abstract Schema getPartitionSchema(final String catalogName);
@Override
public abstract void getPartitions(
final BlockWriter blockWriter,
final GetTableLayoutRequest request, QueryStatusChecker queryStatusChecker)
throws Exception;
@Override
public abstract GetSplitsResponse doGetSplits(BlockAllocator blockAllocator, GetSplitsRequest getSplitsRequest);
protected List getSplitClauses(final TableName tableName)
{
List splitClauses = new ArrayList<>();
try (Connection jdbcConnection = getJdbcConnectionFactory().getConnection(getCredentialProvider());
ResultSet resultSet = jdbcConnection.getMetaData().getPrimaryKeys(null, tableName.getSchemaName(), tableName.getTableName())) {
List primaryKeyColumns = new ArrayList<>();
while (resultSet.next()) {
primaryKeyColumns.add(resultSet.getString("COLUMN_NAME"));
}
if (!primaryKeyColumns.isEmpty()) {
try (Statement statement = jdbcConnection.createStatement();
ResultSet minMaxResultSet = statement.executeQuery(String.format(SQL_SPLITS_STRING, primaryKeyColumns.get(0), primaryKeyColumns.get(0),
tableName.getSchemaName(), tableName.getTableName()))) {
minMaxResultSet.next(); // expecting one result row
Optional optionalSplitter = splitterFactory.getSplitter(primaryKeyColumns.get(0), minMaxResultSet, DEFAULT_NUM_SPLITS);
if (optionalSplitter.isPresent()) {
Splitter splitter = optionalSplitter.get();
while (splitter.hasNext()) {
String splitClause = splitter.nextRangeClause();
LOGGER.info("Split generated {}", splitClause);
splitClauses.add(splitClause);
}
}
}
}
}
catch (Exception ex) {
LOGGER.warn("Unable to split data.", ex);
}
return splitClauses;
}
/**
* Converts an ARRAY column's TYPE_NAME (provided by the jdbc metadata) to an ArrowType.
* @param typeName The column's TYPE_NAME (e.g. _int4, _text, _float8, etc...)
* @param precision Used for BigDecimal ArrowType
* @param scale Used for BigDecimal ArrowType
* @return Utf8 ArrowType (VARCHAR)
*/
protected ArrowType getArrayArrowTypeFromTypeName(String typeName, int precision, int scale)
{
// Default ARRAY type is VARCHAR.
return new ArrowType.Utf8();
}
/**
* Helper function that provides a single partition for Query Pass-Through
*
*/
protected GetSplitsResponse setupQueryPassthroughSplit(GetSplitsRequest request)
{
//Every split must have a unique location if we wish to spill to avoid failures
SpillLocation spillLocation = makeSpillLocation(request);
//Since this is QPT query we return a fixed split.
Map qptArguments = request.getConstraints().getQueryPassthroughArguments();
return new GetSplitsResponse(request.getCatalogName(),
Split.newBuilder(spillLocation, makeEncryptionKey())
.applyProperties(qptArguments)
.build());
}
}
