src/org/sonews/storage/impl/DrupalDatabase.java
author František Kučera <franta-hg@frantovo.cz>
Tue, 11 Oct 2011 00:38:41 +0200
changeset 68 6e16e3bee1ca
parent 67 4653fc7609e7
child 69 b51612c18a54
permissions -rw-r--r--
Drupal: částečně funkční – jde stáhnout zprávy s předmětem a textem.
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/*
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 *   SONEWS News Server
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 *   see AUTHORS for the list of contributors
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 *
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 *   This program is free software: you can redistribute it and/or modify
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 *   it under the terms of the GNU General Public License as published by
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 *   the Free Software Foundation, either version 3 of the License, or
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 *   (at your option) any later version.
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 *
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 *   This program is distributed in the hope that it will be useful,
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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *   GNU General Public License for more details.
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 *
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 *   You should have received a copy of the GNU General Public License
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 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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package org.sonews.storage.impl;
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import java.io.UnsupportedEncodingException;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.sql.Statement;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import javax.mail.internet.MimeUtility;
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import org.sonews.config.Config;
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import org.sonews.feed.Subscription;
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import org.sonews.storage.Article;
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import org.sonews.storage.ArticleHead;
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import org.sonews.storage.Group;
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import org.sonews.storage.Storage;
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import org.sonews.storage.StorageBackendException;
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import org.sonews.util.Pair;
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/**
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 *
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 * @author František Kučera (frantovo.cz)
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 */
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public class DrupalDatabase implements Storage {
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	private static final Logger log = Logger.getLogger(DrupalDatabase.class.getName());
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	public static final String CRLF = "\r\n";
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	public static final int MAX_RESTARTS = 2;
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	/** How many times the database connection was reinitialized */
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	protected int restarts = 0;
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	protected Connection conn = null;
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	public DrupalDatabase() throws StorageBackendException {
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		connectDatabase();
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	}
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	private void connectDatabase() throws StorageBackendException {
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		try {
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			// Load database driver
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			String driverClass = Config.inst().get(Config.LEVEL_FILE, Config.STORAGE_DBMSDRIVER, "java.lang.Object");
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			Class.forName(driverClass);
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			// Establish database connection
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			String url = Config.inst().get(Config.LEVEL_FILE, Config.STORAGE_DATABASE, "<not specified>");
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			String username = Config.inst().get(Config.LEVEL_FILE, Config.STORAGE_USER, "root");
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			String password = Config.inst().get(Config.LEVEL_FILE, Config.STORAGE_PASSWORD, "");
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			conn = DriverManager.getConnection(url, username, password);
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			conn.setTransactionIsolation(Connection.TRANSACTION_SERIALIZABLE);
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			if (conn.getTransactionIsolation() != Connection.TRANSACTION_SERIALIZABLE) {
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				log.warning("Database is NOT fully serializable!");
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			}
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		} catch (Exception e) {
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			throw new StorageBackendException(e);
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		}
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	}
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	protected static void close(Connection connection, Statement statement, ResultSet resultSet) {
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		if (resultSet != null) {
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			try {
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				resultSet.close();
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			} catch (Exception e) {
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			}
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		}
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		if (statement != null) {
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			try {
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				statement.close();
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			} catch (Exception e) {
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			}
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		}
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		if (connection != null) {
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			try {
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				connection.close();
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			} catch (Exception e) {
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			}
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		}
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	}
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	/**
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	 * 
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	 * @param messageID {0}-{1}-{2}@domain.tld where {0} is nntp_id and {1} is group_id and {2} is group_name
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	 * @return array where [0] = nntp_id and [1] = group_id and [2] = group_name or returns null if messageID is invalid
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	 */
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	private static String[] parseMessageID(String messageID) {
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		if (messageID.matches("[0-9]+\\-[0-9]+\\-[a-z0-9\\.]+@.+")) {
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			return messageID.split("@")[0].split("\\-");
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		} else {
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			return null;
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		}
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	}
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	private static Long parseArticleID(String messageID) {
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		String[] localPart = parseMessageID(messageID);
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		if (localPart == null) {
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			return null;
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		} else {
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			return Long.parseLong(localPart[0]);
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		}
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	}
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	private static Long parseGroupID(String messageID) {
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		String[] localPart = parseMessageID(messageID);
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		if (localPart == null) {
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			return null;
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		} else {
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			return Long.parseLong(localPart[1]);
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		}
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	}
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	private static String parseGroupName(String messageID) {
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		String[] localPart = parseMessageID(messageID);
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		if (localPart == null) {
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			return null;
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		} else {
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			return localPart[2];
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		}
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	}
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	private static String constructHeaders(ResultSet rs) throws SQLException, UnsupportedEncodingException {
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		StringBuilder sb = new StringBuilder();
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		sb.append("Message-id: ");
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		sb.append(rs.getInt("id"));
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		sb.append("-");
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		sb.append(rs.getInt("group_id"));
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		sb.append("-");
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		sb.append(rs.getString("group_name"));
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		sb.append("@");
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		sb.append("nntp.kinderporno.cz");
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		sb.append(CRLF);
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		sb.append("From: ");
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		sb.append(MimeUtility.encodeWord(rs.getString("sender_name")));
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		sb.append(" <>");
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		sb.append(CRLF);
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		sb.append("Subject: ");
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		sb.append(MimeUtility.encodeWord(rs.getString("subject")));
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		sb.append(CRLF);
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		return sb.toString();
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	}
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	@Override
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	public List<Group> getGroups() throws StorageBackendException {
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		PreparedStatement ps = null;
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		ResultSet rs = null;
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		try {
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			ps = conn.prepareStatement("SELECT * FROM nntp_group");
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			rs = ps.executeQuery();
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			List<Group> skupiny = new ArrayList<Group>();
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			while (rs.next()) {
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				skupiny.add(new Group(rs.getString("name"), rs.getInt("id"), Group.READONLY));
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			}
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			return skupiny;
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		} catch (Exception e) {
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			throw new StorageBackendException(e);
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		} finally {
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			close(null, ps, rs);
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		}
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	}
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	@Override
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	public Group getGroup(String name) throws StorageBackendException {
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		PreparedStatement ps = null;
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		ResultSet rs = null;
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		try {
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			ps = conn.prepareStatement("SELECT * FROM nntp_group WHERE name = ?");
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			ps.setString(1, name);
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			rs = ps.executeQuery();
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			while (rs.next()) {
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				return new Group(rs.getString("name"), rs.getInt("id"), Group.READONLY);
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			}
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			return null;
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		} catch (Exception e) {
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			throw new StorageBackendException(e);
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		} finally {
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			close(null, ps, rs);
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		}
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	}
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	@Override
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	public boolean isGroupExisting(String groupname) throws StorageBackendException {
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		return getGroup(groupname) != null;
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	}
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	@Override
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	public Article getArticle(String messageID) throws StorageBackendException {
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		Long articleID = parseArticleID(messageID);
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		Long groupID = parseGroupID(messageID);
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		if (articleID == null || groupID == null) {
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			log.log(Level.SEVERE, "Invalid messageID: {0}", new Object[]{messageID});
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			return null;
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		} else {
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			return getArticle(articleID, groupID);
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		}
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	}
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	@Override
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	public Article getArticle(long articleID, long groupID) throws StorageBackendException {
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		PreparedStatement ps = null;
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		ResultSet rs = null;
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		try {
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			ps = conn.prepareStatement("SELECT * FROM nntp_article WHERE id = ? AND group_id = ?");
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			ps.setLong(1, articleID);
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			ps.setLong(2, groupID);
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			rs = ps.executeQuery();
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			if (rs.next()) {
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				String headers = constructHeaders(rs);
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				byte[] body = rs.getString("text").getBytes();
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				return new Article(headers, body);
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			} else {
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				return null;
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			}
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		} catch (Exception e) {
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			throw new StorageBackendException(e);
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		} finally {
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			close(null, ps, rs);
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		}
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	}
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	@Override
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	public List<Pair<Long, ArticleHead>> getArticleHeads(Group group, long first, long last) throws StorageBackendException {
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		PreparedStatement ps = null;
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		ResultSet rs = null;
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		try {
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			ps = conn.prepareStatement("SELECT * FROM nntp_article WHERE group_id = ? AND id >= ? AND id <= ?");
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			ps.setLong(1, group.getInternalID());
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			ps.setLong(2, first);
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			ps.setLong(3, last);
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			rs = ps.executeQuery();
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			List<Pair<Long, ArticleHead>> heads = new ArrayList<Pair<Long, ArticleHead>>();
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			while (rs.next()) {
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				String headers = constructHeaders(rs);
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				heads.add(new Pair<Long, ArticleHead>(rs.getLong("id"), new ArticleHead(headers)));
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			}
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			return heads;
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		} catch (Exception e) {
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			throw new StorageBackendException(e);
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		} finally {
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			close(null, ps, rs);
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		}
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	}
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	@Override
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	public List<Pair<Long, String>> getArticleHeaders(Group group, long start, long end, String header, String pattern) throws StorageBackendException {
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		log.log(Level.SEVERE, "TODO: getArticleHeaders {0} / {1} / {2} / {3} / {4}", new Object[]{group, start, end, header, pattern});
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		/** TODO: */
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		return Collections.emptyList();
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	}
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	@Override
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	public long getArticleIndex(Article article, Group group) throws StorageBackendException {
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		Long id = parseArticleID(article.getMessageID());
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		if (id == null) {
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			throw new StorageBackendException("Invalid messageID: " + article.getMessageID());
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		} else {
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			return id;
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		}
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	}
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	@Override
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	public List<Long> getArticleNumbers(long groupID) throws StorageBackendException {
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		PreparedStatement ps = null;
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		ResultSet rs = null;
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		try {
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			ps = conn.prepareStatement("SELECT id FROM nntp_article WHERE group_id = ?");
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			ps.setLong(1, groupID);
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			rs = ps.executeQuery();
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			List<Long> articleNumbers = new ArrayList<Long>();
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			while (rs.next()) {
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				articleNumbers.add(rs.getLong(1));
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			}
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			return articleNumbers;
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		} catch (Exception e) {
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			throw new StorageBackendException(e);
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		} finally {
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			close(null, ps, rs);
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		}
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	}
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	@Override
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	public int getFirstArticleNumber(Group group) throws StorageBackendException {
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		PreparedStatement ps = null;
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		ResultSet rs = null;
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		try {
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			ps = conn.prepareStatement("SELECT min(id) FROM nntp_article WHERE group_id = ?");
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			ps.setLong(1, group.getInternalID());
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			rs = ps.executeQuery();
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			rs.next();
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			return rs.getInt(1);
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		} catch (Exception e) {
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			throw new StorageBackendException(e);
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		} finally {
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			close(null, ps, rs);
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		}
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	}
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	@Override
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	public int getLastArticleNumber(Group group) throws StorageBackendException {
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		PreparedStatement ps = null;
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		ResultSet rs = null;
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		try {
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			ps = conn.prepareStatement("SELECT max(id) FROM nntp_article WHERE group_id = ?");
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			ps.setLong(1, group.getInternalID());
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			rs = ps.executeQuery();
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			rs.next();
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			return rs.getInt(1);
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		} catch (Exception e) {
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			throw new StorageBackendException(e);
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		} finally {
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			close(null, ps, rs);
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		}
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	}
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	@Override
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	public boolean isArticleExisting(String messageID) throws StorageBackendException {
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		Long articleID = parseArticleID(messageID);
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		Long groupID = parseGroupID(messageID);
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		if (articleID == null || groupID == null) {
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   356
			return false;
franta-hg@68
   357
		} else {
franta-hg@68
   358
			PreparedStatement ps = null;
franta-hg@68
   359
			ResultSet rs = null;
franta-hg@68
   360
			try {
franta-hg@68
   361
				ps = conn.prepareStatement("SELECT count(*) FROM nntp_article WHERE id = ? AND group_id = ?");
franta-hg@68
   362
				ps.setLong(1, articleID);
franta-hg@68
   363
				ps.setLong(2, groupID);
franta-hg@68
   364
				rs = ps.executeQuery();
franta-hg@68
   365
franta-hg@68
   366
				rs.next();
franta-hg@68
   367
				return rs.getInt(1) == 1;
franta-hg@68
   368
			} catch (Exception e) {
franta-hg@68
   369
				throw new StorageBackendException(e);
franta-hg@68
   370
			} finally {
franta-hg@68
   371
				close(null, ps, rs);
franta-hg@68
   372
			}
franta-hg@68
   373
		}
franta-hg@67
   374
	}
franta-hg@67
   375
franta-hg@67
   376
	//
franta-hg@67
   377
	// --- zatím neimplementovat ---
franta-hg@67
   378
	//
franta-hg@67
   379
	@Override
franta-hg@67
   380
	public void addArticle(Article art) throws StorageBackendException {
franta-hg@67
   381
		log.log(Level.SEVERE, "TODO: addArticle {0}", new Object[]{art});
franta-hg@67
   382
	}
franta-hg@67
   383
franta-hg@67
   384
	@Override
franta-hg@67
   385
	public void addEvent(long timestamp, int type, long groupID) throws StorageBackendException {
franta-hg@67
   386
		log.log(Level.SEVERE, "TODO: addEvent {0} / {1} / {2}", new Object[]{timestamp, type, groupID});
franta-hg@67
   387
	}
franta-hg@67
   388
franta-hg@67
   389
	@Override
franta-hg@67
   390
	public void addGroup(String groupname, int flags) throws StorageBackendException {
franta-hg@67
   391
		log.log(Level.SEVERE, "TODO: addGroup {0} / {1}", new Object[]{groupname, flags});
franta-hg@67
   392
	}
franta-hg@67
   393
franta-hg@67
   394
	@Override
franta-hg@67
   395
	public int countArticles() throws StorageBackendException {
franta-hg@67
   396
		log.log(Level.SEVERE, "TODO: countArticles");
franta-hg@67
   397
		return 0;
franta-hg@67
   398
	}
franta-hg@67
   399
franta-hg@67
   400
	@Override
franta-hg@67
   401
	public int countGroups() throws StorageBackendException {
franta-hg@67
   402
		log.log(Level.SEVERE, "TODO: countGroups");
franta-hg@67
   403
		return 0;
franta-hg@67
   404
	}
franta-hg@67
   405
franta-hg@67
   406
	@Override
franta-hg@67
   407
	public void delete(String messageID) throws StorageBackendException {
franta-hg@67
   408
		log.log(Level.SEVERE, "TODO: delete {0}", new Object[]{messageID});
franta-hg@67
   409
	}
franta-hg@67
   410
franta-hg@67
   411
	@Override
franta-hg@64
   412
	public String getConfigValue(String key) throws StorageBackendException {
franta-hg@66
   413
		log.log(Level.SEVERE, "TODO: getConfigValue {0}", new Object[]{key});
franta-hg@65
   414
		return null;
franta-hg@64
   415
	}
franta-hg@64
   416
franta-hg@64
   417
	@Override
franta-hg@64
   418
	public int getEventsCount(int eventType, long startTimestamp, long endTimestamp, Group group) throws StorageBackendException {
franta-hg@66
   419
		log.log(Level.SEVERE, "TODO: getEventsCount {0} / {1} / {2} / {3}", new Object[]{eventType, startTimestamp, endTimestamp, group});
franta-hg@65
   420
		return 0;
franta-hg@64
   421
	}
franta-hg@64
   422
franta-hg@64
   423
	@Override
franta-hg@64
   424
	public double getEventsPerHour(int key, long gid) throws StorageBackendException {
franta-hg@66
   425
		log.log(Level.SEVERE, "TODO: getEventsPerHour {0} / {1}", new Object[]{key, gid});
franta-hg@65
   426
		return 0;
franta-hg@64
   427
	}
franta-hg@64
   428
franta-hg@64
   429
	@Override
franta-hg@64
   430
	public List<String> getGroupsForList(String listAddress) throws StorageBackendException {
franta-hg@66
   431
		log.log(Level.SEVERE, "TODO: getGroupsForList {0}", new Object[]{listAddress});
franta-hg@65
   432
		return Collections.emptyList();
franta-hg@64
   433
	}
franta-hg@64
   434
franta-hg@64
   435
	@Override
franta-hg@64
   436
	public List<String> getListsForGroup(String groupname) throws StorageBackendException {
franta-hg@66
   437
		log.log(Level.SEVERE, "TODO: getListsForGroup {0}", new Object[]{groupname});
franta-hg@65
   438
		return Collections.emptyList();
franta-hg@64
   439
	}
franta-hg@64
   440
franta-hg@64
   441
	@Override
franta-hg@64
   442
	public String getOldestArticle() throws StorageBackendException {
franta-hg@66
   443
		log.log(Level.SEVERE, "TODO: getOldestArticle");
franta-hg@65
   444
		return null;
franta-hg@64
   445
	}
franta-hg@64
   446
franta-hg@64
   447
	@Override
franta-hg@64
   448
	public int getPostingsCount(String groupname) throws StorageBackendException {
franta-hg@66
   449
		log.log(Level.SEVERE, "TODO: getPostingsCount {0}", new Object[]{groupname});
franta-hg@65
   450
		return 0;
franta-hg@64
   451
	}
franta-hg@64
   452
franta-hg@64
   453
	@Override
franta-hg@64
   454
	public List<Subscription> getSubscriptions(int type) throws StorageBackendException {
franta-hg@66
   455
		log.log(Level.SEVERE, "TODO: getSubscriptions {0}", new Object[]{type});
franta-hg@65
   456
		return Collections.emptyList();
franta-hg@64
   457
	}
franta-hg@64
   458
franta-hg@64
   459
	@Override
franta-hg@64
   460
	public void purgeGroup(Group group) throws StorageBackendException {
franta-hg@66
   461
		log.log(Level.SEVERE, "TODO: purgeGroup {0}", new Object[]{group});
franta-hg@64
   462
	}
franta-hg@64
   463
franta-hg@64
   464
	@Override
franta-hg@64
   465
	public void setConfigValue(String key, String value) throws StorageBackendException {
franta-hg@66
   466
		log.log(Level.SEVERE, "TODO: setConfigValue {0} = {1}", new Object[]{key, value});
franta-hg@64
   467
	}
franta-hg@64
   468
franta-hg@64
   469
	@Override
franta-hg@64
   470
	public boolean update(Article article) throws StorageBackendException {
franta-hg@66
   471
		log.log(Level.SEVERE, "TODO: update {0}", new Object[]{article});
franta-hg@65
   472
		throw new StorageBackendException("Not implemented yet.");
franta-hg@64
   473
	}
franta-hg@64
   474
franta-hg@64
   475
	@Override
franta-hg@64
   476
	public boolean update(Group group) throws StorageBackendException {
franta-hg@66
   477
		log.log(Level.SEVERE, "TODO: update {0}", new Object[]{group});
franta-hg@65
   478
		throw new StorageBackendException("Not implemented yet.");
franta-hg@64
   479
	}
franta-hg@63
   480
}