[GitHub] [shardingsphere] justbk2015 commented on a change in pull request #12318: [feature] add scaling adapt feature for openGauss

[GitBox <gi...@apache.org>]

justbk2015 commented on a change in pull request #12318:
URL: https://github.com/apache/shardingsphere/pull/12318#discussion_r706533247



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File path: shardingsphere-scaling/shardingsphere-scaling-dialect/shardingsphere-scaling-opengauss/src/main/java/org/apache/shardingsphere/scaling/opengauss/wal/OpenGaussLogicalReplication.java
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@@ -0,0 +1,129 @@
+/*
+ * 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.scaling.opengauss.wal;
+
+import org.apache.shardingsphere.scaling.core.config.datasource.StandardJDBCDataSourceConfiguration;
+import org.apache.shardingsphere.scaling.postgresql.wal.event.LogSequenceNumberBase;
+import org.opengauss.PGProperty;
+import org.opengauss.jdbc.PgConnection;
+import org.opengauss.replication.LogSequenceNumber;
+import org.opengauss.replication.PGReplicationStream;
+import org.opengauss.util.PSQLException;
+
+import java.sql.CallableStatement;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.Properties;
+
+/**
+ * OpenGauss logical replication.
+ */
+public final class OpenGaussLogicalReplication {
+
+    public static final String SLOT_NAME = "sharding_scaling";
+
+    public static final String DECODE_PLUGIN = "test_decoding";
+
+    public static final String DUPLICATE_OBJECT_ERROR_CODE = "42710";
+
+    /**
+     * Create OpenGauss connection.
+     *
+     * @param jdbcDataSourceConfig JDBC data source configuration
+     * @return OpenGauss connection
+     * @throws SQLException sql exception
+     */
+    public Connection createPgConnection(final StandardJDBCDataSourceConfiguration jdbcDataSourceConfig) throws SQLException {
+        return createConnection(jdbcDataSourceConfig);
+    }
+    
+    private Connection createConnection(final StandardJDBCDataSourceConfiguration jdbcDataSourceConfig) throws SQLException {
+        Properties props = new Properties();
+        PGProperty.USER.set(props, jdbcDataSourceConfig.getHikariConfig().getUsername());
+        PGProperty.PASSWORD.set(props, jdbcDataSourceConfig.getHikariConfig().getPassword());
+        PGProperty.ASSUME_MIN_SERVER_VERSION.set(props, "9.4");
+        PGProperty.REPLICATION.set(props, "database");
+        PGProperty.PREFER_QUERY_MODE.set(props, "simple");
+        return DriverManager.getConnection(jdbcDataSourceConfig.getHikariConfig().getJdbcUrl(), props);
+    }
+    
+    /**
+     * Create OpenGauss replication stream.
+     *
+     * @param pgConnection OpenGauss connection
+     * @param startPosition start position
+     * @return replication stream
+     * @throws SQLException sql exception
+     */
+    public PGReplicationStream createReplicationStream(final PgConnection pgConnection, final LogSequenceNumberBase startPosition) throws SQLException {
+        return pgConnection.getReplicationAPI()
+                .replicationStream()
+                .logical()
+                .withSlotName(SLOT_NAME)
+                .withSlotOption("include-xids", true)
+                .withSlotOption("skip-empty-xacts", true)
+                .withStartPosition((LogSequenceNumber) startPosition.get())
+                .start();
+    }
+
+    /**
+     * Drop exist slots.
+     *
+     * @param conn the datasource connection
+     * @throws SQLException the sql exp
+     */
+    public static void createIfNotExists(final Connection conn) throws SQLException {
+        if (isSlotNameExist(conn)) {
+            dropSlot(conn);

Review comment:
       no data lost. Before replication slot work, we use inventory task to copy data. So we recreate replication after inventory task is right. avoid og wal_sender thread out of work in previous task.




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