TeslaCN commented on a change in pull request #16268: URL: https://github.com/apache/shardingsphere/pull/16268#discussion_r836976345
########## File path: shardingsphere-proxy/shardingsphere-proxy-frontend/shardingsphere-proxy-frontend-mysql/src/main/java/org/apache/shardingsphere/proxy/frontend/mysql/command/query/text/query/MySQLMultiStatementsHandler.java ########## @@ -0,0 +1,198 @@ +/* + * 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. + */ + +package org.apache.shardingsphere.proxy.frontend.mysql.command.query.text.query; + +import org.apache.shardingsphere.infra.binder.LogicSQL; +import org.apache.shardingsphere.infra.binder.SQLStatementContextFactory; +import org.apache.shardingsphere.infra.binder.statement.SQLStatementContext; +import org.apache.shardingsphere.infra.config.props.ConfigurationPropertyKey; +import org.apache.shardingsphere.infra.context.kernel.KernelProcessor; +import org.apache.shardingsphere.infra.database.type.DatabaseType; +import org.apache.shardingsphere.infra.database.type.DatabaseTypeRegistry; +import org.apache.shardingsphere.infra.executor.check.SQLCheckEngine; +import org.apache.shardingsphere.infra.executor.kernel.model.ExecutionGroup; +import org.apache.shardingsphere.infra.executor.kernel.model.ExecutionGroupContext; +import org.apache.shardingsphere.infra.executor.sql.context.ExecutionContext; +import org.apache.shardingsphere.infra.executor.sql.context.ExecutionUnit; +import org.apache.shardingsphere.infra.executor.sql.execute.engine.ConnectionMode; +import org.apache.shardingsphere.infra.executor.sql.execute.engine.SQLExecutorExceptionHandler; +import org.apache.shardingsphere.infra.executor.sql.execute.engine.driver.jdbc.JDBCExecutionUnit; +import org.apache.shardingsphere.infra.executor.sql.execute.engine.driver.jdbc.JDBCExecutor; +import org.apache.shardingsphere.infra.executor.sql.execute.engine.driver.jdbc.JDBCExecutorCallback; +import org.apache.shardingsphere.infra.executor.sql.execute.result.update.UpdateResult; +import org.apache.shardingsphere.infra.executor.sql.prepare.driver.DriverExecutionPrepareEngine; +import org.apache.shardingsphere.infra.executor.sql.prepare.driver.jdbc.JDBCDriverType; +import org.apache.shardingsphere.infra.executor.sql.prepare.driver.jdbc.StatementOption; +import org.apache.shardingsphere.infra.parser.ShardingSphereSQLParserEngine; +import org.apache.shardingsphere.infra.rule.ShardingSphereRule; +import org.apache.shardingsphere.mode.metadata.MetaDataContexts; +import org.apache.shardingsphere.parser.rule.SQLParserRule; +import org.apache.shardingsphere.proxy.backend.communication.jdbc.connection.JDBCBackendConnection; +import org.apache.shardingsphere.proxy.backend.communication.jdbc.statement.JDBCBackendStatement; +import org.apache.shardingsphere.proxy.backend.context.BackendExecutorContext; +import org.apache.shardingsphere.proxy.backend.context.ProxyContext; +import org.apache.shardingsphere.proxy.backend.response.header.ResponseHeader; +import org.apache.shardingsphere.proxy.backend.response.header.update.UpdateResponseHeader; +import org.apache.shardingsphere.proxy.backend.session.ConnectionSession; +import org.apache.shardingsphere.proxy.backend.text.TextProtocolBackendHandler; +import org.apache.shardingsphere.sql.parser.sql.common.statement.SQLStatement; +import org.apache.shardingsphere.sql.parser.sql.common.statement.dml.UpdateStatement; + +import java.sql.Connection; +import java.sql.SQLException; +import java.sql.Statement; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collection; +import java.util.Collections; +import java.util.HashMap; +import java.util.LinkedList; +import java.util.List; +import java.util.Map; +import java.util.Optional; +import java.util.regex.Pattern; + +/** + * Handler for MySQL multi statements. + */ +public final class MySQLMultiStatementsHandler implements TextProtocolBackendHandler { + + private static final Pattern MULTI_UPDATE_STATEMENTS = Pattern.compile(";(?=\\s+update)", Pattern.CASE_INSENSITIVE); + + private static final Pattern MULTI_DELETE_STATEMENTS = Pattern.compile(";(?=\\s+delete)", Pattern.CASE_INSENSITIVE); + + private final KernelProcessor kernelProcessor = new KernelProcessor(); + + private final JDBCExecutor jdbcExecutor = new JDBCExecutor(BackendExecutorContext.getInstance().getExecutorEngine(), false); + + private final ConnectionSession connectionSession; + + private final SQLStatement sqlStatementSample; + + private final MetaDataContexts metaDataContexts = ProxyContext.getInstance().getContextManager().getMetaDataContexts(); + + private final Map<String, List<ExecutionUnit>> dataSourcesToExecutionUnits = new HashMap<>(); + + private ExecutionContext anyExecutionContext; + + public MySQLMultiStatementsHandler(final ConnectionSession connectionSession, final SQLStatement sqlStatementSample, final String sql) { + this.connectionSession = connectionSession; + this.sqlStatementSample = sqlStatementSample; + Pattern pattern = sqlStatementSample instanceof UpdateStatement ? MULTI_UPDATE_STATEMENTS : MULTI_DELETE_STATEMENTS; + ShardingSphereSQLParserEngine sqlParserEngine = getSQLParserEngine(); + for (String each : extractMultiStatements(pattern, sql)) { + SQLStatement eachSQLStatement = sqlParserEngine.parse(each, false); + ExecutionContext executionContext = createExecutionContext(createLogicSQL(each, eachSQLStatement)); + if (null == anyExecutionContext) { + anyExecutionContext = executionContext; + } + for (ExecutionUnit eachExecutionUnit : executionContext.getExecutionUnits()) { + dataSourcesToExecutionUnits.computeIfAbsent(eachExecutionUnit.getDataSourceName(), unused -> new LinkedList<>()).add(eachExecutionUnit); + } + } + } + + private ShardingSphereSQLParserEngine getSQLParserEngine() { + MetaDataContexts metaDataContexts = ProxyContext.getInstance().getContextManager().getMetaDataContexts(); + return new ShardingSphereSQLParserEngine(DatabaseTypeRegistry.getTrunkDatabaseTypeName(metaDataContexts.getMetaData(connectionSession.getSchemaName()).getResource().getDatabaseType()), + metaDataContexts.getGlobalRuleMetaData().findSingleRule(SQLParserRule.class).orElse(null)); + } + + private List<String> extractMultiStatements(final Pattern pattern, final String sql) { + // TODO Multi statements should be split by SQL Parser instead of simple regexp. + return Arrays.asList(pattern.split(sql)); + } + + private LogicSQL createLogicSQL(final String sql, final SQLStatement sqlStatement) { + SQLStatementContext<?> sqlStatementContext = SQLStatementContextFactory.newInstance( + metaDataContexts.getMetaDataMap(), Collections.emptyList(), sqlStatement, connectionSession.getSchemaName()); + return new LogicSQL(sqlStatementContext, sql, Collections.emptyList()); + } + + private ExecutionContext createExecutionContext(final LogicSQL logicSQL) { + SQLCheckEngine.check(logicSQL.getSqlStatementContext().getSqlStatement(), logicSQL.getParameters(), + metaDataContexts.getMetaData(connectionSession.getSchemaName()).getRuleMetaData().getRules(), connectionSession.getSchemaName(), metaDataContexts.getMetaDataMap(), null); + return kernelProcessor.generateExecutionContext(logicSQL, metaDataContexts.getMetaData(connectionSession.getSchemaName()), metaDataContexts.getProps()); + } + + @Override + public ResponseHeader execute() throws SQLException { + Collection<ShardingSphereRule> rules = metaDataContexts.getMetaData(connectionSession.getSchemaName()).getRuleMetaData().getRules(); + DriverExecutionPrepareEngine<JDBCExecutionUnit, Connection> prepareEngine = new DriverExecutionPrepareEngine<>( + JDBCDriverType.STATEMENT, metaDataContexts.getProps().<Integer>getValue(ConfigurationPropertyKey.MAX_CONNECTIONS_SIZE_PER_QUERY), + (JDBCBackendConnection) connectionSession.getBackendConnection(), (JDBCBackendStatement) connectionSession.getStatementManager(), new StatementOption(false), rules); + ExecutionGroupContext<JDBCExecutionUnit> executionGroupContext = prepareEngine.prepare(anyExecutionContext.getRouteContext(), samplingExecutionUnit()); + for (ExecutionGroup<JDBCExecutionUnit> eachGroup : executionGroupContext.getInputGroups()) { + for (JDBCExecutionUnit each : eachGroup.getInputs()) { + prepareBatchedStatement(each); + } + } + return executeBatchedStatements(executionGroupContext); + } + + private Collection<ExecutionUnit> samplingExecutionUnit() { + Collection<ExecutionUnit> result = new ArrayList<>(dataSourcesToExecutionUnits.size()); + for (List<ExecutionUnit> each : dataSourcesToExecutionUnits.values()) { + result.add(each.get(0)); + } + return result; + } + + private void prepareBatchedStatement(final JDBCExecutionUnit each) throws SQLException { + Statement statement = each.getStorageResource(); + for (ExecutionUnit eachExecutionUnit : dataSourcesToExecutionUnits.get(each.getExecutionUnit().getDataSourceName())) { + statement.addBatch(eachExecutionUnit.getSqlUnit().getSql()); + } + } + + private UpdateResponseHeader executeBatchedStatements(final ExecutionGroupContext<JDBCExecutionUnit> executionGroupContext) throws SQLException { Review comment: Sorry, I dont understand. 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