TeslaCN commented on a change in pull request #16106: URL: https://github.com/apache/shardingsphere/pull/16106#discussion_r826873992
########## File path: shardingsphere-features/shardingsphere-db-discovery/shardingsphere-db-discovery-provider/shardingsphere-db-discovery-mysql/src/main/java/org/apache/shardingsphere/dbdiscovery/mysql/ShowSlaveStatusDatabaseDiscoveryType.java ########## @@ -0,0 +1,158 @@ +/* + * 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.dbdiscovery.mysql; + +import lombok.Getter; +import lombok.Setter; +import lombok.extern.slf4j.Slf4j; +import org.apache.shardingsphere.dbdiscovery.spi.DatabaseDiscoveryType; +import org.apache.shardingsphere.infra.eventbus.ShardingSphereEventBus; +import org.apache.shardingsphere.infra.rule.event.impl.DataSourceDisabledEvent; +import org.apache.shardingsphere.infra.rule.event.impl.PrimaryDataSourceChangedEvent; + +import javax.sql.DataSource; +import java.sql.Connection; +import java.sql.ResultSet; +import java.sql.SQLException; +import java.sql.Statement; +import java.util.Collection; +import java.util.HashMap; +import java.util.Map; +import java.util.Map.Entry; +import java.util.Properties; + +/** + * Show slave status database discovery type. + */ +@Slf4j +public final class ShowSlaveStatusDatabaseDiscoveryType implements DatabaseDiscoveryType { + + private static final String SHOW_SLAVE_STATUS = "SHOW SLAVE STATUS"; + + private String oldPrimaryDataSource; + + @Getter + @Setter + private Properties props = new Properties(); + + @Override + public void checkDatabaseDiscoveryConfiguration(final String schemaName, final Map<String, DataSource> dataSourceMap) { + //TODO Check master-slave mode + } + + //TODO Consider merge MGR 's get primary datasource method + @Override + public void updatePrimaryDataSource(final String schemaName, final Map<String, DataSource> dataSourceMap, final Collection<String> disabledDataSourceNames, final String groupName) { + Map<String, DataSource> activeDataSourceMap = new HashMap<>(dataSourceMap); + if (!disabledDataSourceNames.isEmpty()) { + activeDataSourceMap.entrySet().removeIf(each -> disabledDataSourceNames.contains(each.getKey())); + } + String primaryDatasource = determinePrimaryDataSource(activeDataSourceMap); + if (primaryDatasource.isEmpty()) { + return; + } + if (!primaryDatasource.equals(oldPrimaryDataSource)) { + oldPrimaryDataSource = primaryDatasource; + ShardingSphereEventBus.getInstance().post(new PrimaryDataSourceChangedEvent(schemaName, groupName, primaryDatasource)); + } + } + + //TODO Consider merge MGR 's get primary datasource method + private String determinePrimaryDataSource(final Map<String, DataSource> dataSourceMap) { + String primaryDataSourceURL = findPrimaryDataSourceURL(dataSourceMap); + return findPrimaryDataSourceName(primaryDataSourceURL, dataSourceMap); + } + + //TODO Consider merge MGR 's get primary datasource method + private String findPrimaryDataSourceURL(final Map<String, DataSource> dataSourceMap) { + for (Entry<String, DataSource> entry : dataSourceMap.entrySet()) { + try (Connection connection = entry.getValue().getConnection(); + Statement statement = connection.createStatement()) { + ResultSet resultSet = statement.executeQuery(SHOW_SLAVE_STATUS); + if (resultSet.next()) { + return String.format("%s:%s", resultSet.getString("Master_Host"), resultSet.getString("Master_Port")); + } + } catch (SQLException ex) { + log.error("An exception occurred while find primary data source url", ex); + } + } + return null; + } + + private String findPrimaryDataSourceName(final String primaryDataSourceURL, final Map<String, DataSource> dataSourceMap) { + String result = ""; + for (Entry<String, DataSource> entry : dataSourceMap.entrySet()) { + String url; + try (Connection connection = entry.getValue().getConnection()) { + url = connection.getMetaData().getURL(); + if (null != url && url.contains(primaryDataSourceURL)) { + return entry.getKey(); + } + } catch (final SQLException ex) { + log.error("An exception occurred while find primary data source name", ex); + } + } + return result; + } + + @Override + public void updateMemberState(final String schemaName, final Map<String, DataSource> dataSourceMap, final Collection<String> disabledDataSourceNames) { + Map<String, DataSource> activeDataSourceMap = new HashMap<>(dataSourceMap); + if (!disabledDataSourceNames.isEmpty()) { + activeDataSourceMap.entrySet().removeIf(each -> disabledDataSourceNames.contains(each.getKey())); + } + for (Entry<String, DataSource> entry : activeDataSourceMap.entrySet()) { + if (oldPrimaryDataSource.equals(entry.getKey())) { + continue; + } + determineDatasourceState(schemaName, entry.getKey(), entry.getValue()); + } + } + + private void determineDatasourceState(final String schemaName, final String datasourceName, final DataSource dataSource) { + try (Connection connection = dataSource.getConnection(); + Statement statement = connection.createStatement()) { + long replicationDelayTime = getSecondsBehindMaster(statement); + if (replicationDelayTime * 1000 < Integer.parseInt(props.getProperty("delay_milliseconds_threshold"))) { + ShardingSphereEventBus.getInstance().post(new DataSourceDisabledEvent(schemaName, datasourceName, false)); + } else { + ShardingSphereEventBus.getInstance().post(new DataSourceDisabledEvent(schemaName, datasourceName, true)); + } + } catch (SQLException ex) { + log.error("An exception occurred while find member data source `Seconds_Behind_Master`", ex); + } + } + + private long getSecondsBehindMaster(final Statement statement) throws SQLException { + ResultSet resultSet = statement.executeQuery(SHOW_SLAVE_STATUS); Review comment: The ResultSet is not closed. -- This is an automated message from the Apache Git Service. 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