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/*
* ============LICENSE_START====================================================
* org.onap.music.mdbc
* =============================================================================
* Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
* =============================================================================
* 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.
* ============LICENSE_END======================================================
*/
package org.onap.music.mdbc.query;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.calcite.avatica.util.Casing;
import org.apache.calcite.avatica.util.Quoting;
import org.apache.calcite.sql.SqlBasicCall;
import org.apache.calcite.sql.SqlCall;
import org.apache.calcite.sql.SqlDelete;
import org.apache.calcite.sql.SqlIdentifier;
import org.apache.calcite.sql.SqlInsert;
import org.apache.calcite.sql.SqlJoin;
import org.apache.calcite.sql.SqlKind;
import org.apache.calcite.sql.SqlNode;
import org.apache.calcite.sql.SqlOrderBy;
import org.apache.calcite.sql.SqlSelect;
import org.apache.calcite.sql.SqlUpdate;
import org.apache.calcite.sql.fun.SqlInOperator;
import org.apache.calcite.sql.parser.SqlParseException;
import org.apache.calcite.sql.parser.SqlParser;
import org.apache.calcite.sql.parser.SqlParserImplFactory;
import org.apache.calcite.sql.parser.impl.SqlParserImpl;
import org.apache.calcite.sql.util.SqlBasicVisitor;
import org.apache.calcite.sql.validate.SqlConformance;
import org.apache.calcite.sql.validate.SqlConformanceEnum;
import org.apache.calcite.util.Util;
import org.onap.music.logging.EELFLoggerDelegate;
public class QueryProcessor {
private static EELFLoggerDelegate logger = EELFLoggerDelegate.getLogger(QueryProcessor.class);
public QueryProcessor() {
}
protected static SqlParserImplFactory parserImplFactory() {
return SqlParserImpl.FACTORY;
}
protected static SqlParser getSqlParser(String sql) {
Quoting quoting = Quoting.DOUBLE_QUOTE;
Casing unquotedCasing = Casing.TO_UPPER;
Casing quotedCasing = Casing.UNCHANGED;
SqlConformance conformance = SqlConformanceEnum.DEFAULT;
return SqlParser.create(sql, SqlParser.configBuilder().setParserFactory(parserImplFactory()).setQuoting(quoting)
.setUnquotedCasing(unquotedCasing).setQuotedCasing(quotedCasing).setConformance(conformance).build());
}
/**
*
* @param query
* @param tables set of tables found in sql database. This is only used as a cross reference,
* the parser will try to find tables in the query first, regardless of whether they
* are in this set
* @return map of table name to {@link org.onap.music.mdbc.query.SQLOperation}
* @throws SqlParseException
*/
public static Map<String, List<SQLOperation>> parseSqlQuery(String query, Set<String> tables) throws SQLException {
logger.info(EELFLoggerDelegate.applicationLogger, "Parsing query: "+query);
query = query.trim();
if (query.endsWith(";")) {
query = query.substring(0, query.length() - 1);
}
Map<String, List<SQLOperation>> tableOpsMap = new HashMap<>();
//for Create no need to check locks.
if(query.toUpperCase().startsWith("CREATE")) {
logger.error(EELFLoggerDelegate.errorLogger, "CREATE TABLE DDL not currently supported currently.");
return tableOpsMap;
}
SqlNode sqlNode;
try {
sqlNode = getSqlParser(query).parseStmt();
} catch (SqlParseException e) {
logger.warn(EELFLoggerDelegate.errorLogger, "Unable to parse query: " + query + "; Falling back to Secondary basic parser",e);
return basicStringParser(query, tables);
}
SqlBasicVisitor<Void> visitor = new SqlBasicVisitor<Void>() {
public Void visit(SqlCall call) {
if (call.getOperator() instanceof SqlInOperator) {
throw new Util.FoundOne(call);
}
return super.visit(call);
}
};
sqlNode.accept(visitor);
switch (sqlNode.getKind()) {
case INSERT:
parseInsert((SqlInsert) sqlNode, tableOpsMap);
break;
case UPDATE:
parseUpdate((SqlUpdate) sqlNode, tableOpsMap);
break;
case DELETE:
parseDelete((SqlDelete) sqlNode, tableOpsMap);
break;
case SELECT:
parseSelect((SqlSelect) sqlNode, tableOpsMap);
break;
case ORDER_BY:
parseSelect((SqlSelect)((SqlOrderBy) sqlNode).query, tableOpsMap);
break;
default:
logger.error("Unhandled sql query type " + sqlNode.getKind() +" for query " + query);
}
return tableOpsMap;
}
private static void parseInsert(SqlInsert sqlInsert, Map<String, List<SQLOperation>> tableOpsMap) {
String tableName = sqlInsert.getTargetTable().toString();
//handle insert into select query
if (sqlInsert.getSource().getKind()==SqlKind.SELECT) {
parseSelect((SqlSelect) sqlInsert.getSource(), tableOpsMap);
}
List<SQLOperation> Ops = tableOpsMap.get(tableName);
if (Ops == null)
Ops = new ArrayList<>();
Ops.add(SQLOperation.INSERT);
tableOpsMap.put(tableName, Ops);
}
private static void parseUpdate(SqlUpdate sqlUpdate, Map<String, List<SQLOperation>> tableOpsMap) {
SqlNode targetTable = sqlUpdate.getTargetTable();
switch (targetTable.getKind()) {
case IDENTIFIER:
addIdentifierToMap(tableOpsMap, (SqlIdentifier) targetTable, SQLOperation.UPDATE);
break;
default:
logger.error("Unable to process: " + targetTable.getKind() + " query");
}
}
private static void parseDelete(SqlDelete sqlDelete, Map<String, List<SQLOperation>> tableOpsMap) {
SqlNode targetTable = sqlDelete.getTargetTable();
switch (targetTable.getKind()) {
case IDENTIFIER:
addIdentifierToMap(tableOpsMap, (SqlIdentifier) targetTable, SQLOperation.DELETE);
break;
default:
logger.error("Unable to process: " + targetTable.getKind() + " query");
}
}
private static void parseSelect(SqlSelect sqlSelect, Map<String, List<SQLOperation>> tableOpsMap ) {
SqlNode from = sqlSelect.getFrom();
switch (from.getKind()) {
case IDENTIFIER:
addIdentifierToMap(tableOpsMap, (SqlIdentifier) from, SQLOperation.SELECT);
break;
case AS:
SqlBasicCall as = (SqlBasicCall) from;
SqlNode node = as.getOperandList().get(0);
addIdentifierToMap(tableOpsMap, (SqlIdentifier) node, SQLOperation.SELECT);
break;
case JOIN:
parseJoin((SqlJoin) from, tableOpsMap);
break;
default:
logger.error("Unable to process: " + from.getKind() + " query");
}
}
private static void parseJoin(SqlJoin join, Map<String, List<SQLOperation>> tableOpsMap) {
switch (join.getLeft().getKind()) {
case IDENTIFIER:
addIdentifierToMap(tableOpsMap, (SqlIdentifier) join.getLeft(), SQLOperation.SELECT);
break;
case AS:
SqlBasicCall as = (SqlBasicCall) join.getLeft();
SqlNode node = as.getOperandList().get(0);
addIdentifierToMap(tableOpsMap, (SqlIdentifier) node, SQLOperation.SELECT);
break;
default:
logger.error("Error parsing join. Can't process left type: " + join.getLeft().getKind());
}
switch (join.getRight().getKind()) {
case IDENTIFIER:
addIdentifierToMap(tableOpsMap, (SqlIdentifier) join.getRight(), SQLOperation.SELECT);
break;
case AS:
SqlBasicCall as = (SqlBasicCall) join.getRight();
SqlNode node = as.getOperandList().get(0);
addIdentifierToMap(tableOpsMap, (SqlIdentifier) node, SQLOperation.SELECT);
break;
default:
logger.error("Error parsing join. Can't process left type: " + join.getRight().getKind());
}
}
/**
* Add the identifier, the range in the query, to the map
* @param tableOpsMap
* @param identifier
* @param op
*/
private static void addIdentifierToMap(Map<String, List<SQLOperation>> tableOpsMap, SqlIdentifier identifier,
SQLOperation op) {
List<SQLOperation> opList = tableOpsMap.get(identifier.toString());
if (opList == null) opList = new ArrayList<>();
opList.add(op);
tableOpsMap.put(identifier.toString(), opList);
}
/**
* Parse the string using basic string methods if parsing library fails
* @param query
* @return
* @throws SQLException
*/
private static Map<String, List<SQLOperation>> basicStringParser(String query, Set<String> tables) throws SQLException {
if (tables==null) {
throw new SQLException("Unable to parse sql query: No tables to look for.");
}
Map<String, List<SQLOperation>> tableOpsMap = new HashMap<>();
SQLOperation op;
if (query.toUpperCase().startsWith("INSERT")) {
op = SQLOperation.INSERT;
} else if (query.toUpperCase().startsWith("UPDATE")) {
op = SQLOperation.UPDATE;
} else if (query.toUpperCase().startsWith("DELETE")) {
op = SQLOperation.DELETE;
} else if (query.toUpperCase().startsWith("SELECT")) {
op = SQLOperation.SELECT;
} else {
throw new SQLException("Unable to parse sql query: " + query);
}
for (String table: tables) {
if (query.toLowerCase().contains(table.toLowerCase())) {
List<SQLOperation> opList = tableOpsMap.get(table);
if (opList == null) opList = new ArrayList<>();
opList.add(op);
tableOpsMap.put(table.toString(), opList);
}
}
return tableOpsMap;
}
}
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