src/org/cacert/gigi/database/DatabaseConnection.java

   1 package org.cacert.gigi.database;
   2
   3 import java.io.IOException;
   4 import java.io.InputStream;
   5 import java.sql.Connection;
   6 import java.sql.DriverManager;
   7 import java.sql.ResultSet;
   8 import java.sql.SQLException;
   9 import java.sql.Statement;
  10 import java.util.HashMap;
  11 import java.util.Properties;
  12 import java.util.StringJoiner;
  13 import java.util.regex.Matcher;
  14 import java.util.regex.Pattern;
  15
  16 import org.cacert.gigi.database.SQLFileManager.ImportType;
  17
  18 public class DatabaseConnection {
  19
  20     public static final int CURRENT_SCHEMA_VERSION = 6;
  21
  22     public static final int CONNECTION_TIMEOUT = 24 * 60 * 60;
  23
  24     private Connection c;
  25
  26     private HashMap<String, GigiPreparedStatement> statements = new HashMap<String, GigiPreparedStatement>();
  27
  28     private static Properties credentials;
  29
  30     private Statement adHoc;
  31
  32     public DatabaseConnection() {
  33         try {
  34             Class.forName(credentials.getProperty("sql.driver"));
  35         } catch (ClassNotFoundException e) {
  36             e.printStackTrace();
  37         }
  38         tryConnect();
  39
  40     }
  41
  42     private void tryConnect() {
  43         try {
  44             c = DriverManager.getConnection(credentials.getProperty("sql.url") + "?socketTimeout=" + CONNECTION_TIMEOUT, credentials.getProperty("sql.user"), credentials.getProperty("sql.password"));
  45             adHoc = c.createStatement();
  46         } catch (SQLException e) {
  47             e.printStackTrace();
  48         }
  49     }
  50
  51     public GigiPreparedStatement prepare(String query) {
  52         ensureOpen();
  53         query = preprocessQuery(query);
  54         GigiPreparedStatement statement = statements.get(query);
  55         if (statement == null) {
  56             try {
  57                 statement = new GigiPreparedStatement(c.prepareStatement(query, query.startsWith("SELECT ") ? Statement.NO_GENERATED_KEYS : Statement.RETURN_GENERATED_KEYS));
  58             } catch (SQLException e) {
  59                 throw new Error(e);
  60             }
  61             statements.put(query, statement);
  62         }
  63         return statement;
  64     }
  65
  66     public GigiPreparedStatement prepareScrollable(String query) {
  67         ensureOpen();
  68         query = preprocessQuery(query);
  69         GigiPreparedStatement statement = statements.get(query);
  70         if (statement == null) {
  71             try {
  72                 statement = new GigiPreparedStatement(c.prepareStatement(query, ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY));
  73             } catch (SQLException e) {
  74                 throw new Error(e);
  75             }
  76             statements.put(query, statement);
  77         }
  78         return statement;
  79     }
  80
  81     private long lastAction = System.currentTimeMillis();
  82
  83     private void ensureOpen() {
  84         if (System.currentTimeMillis() - lastAction > CONNECTION_TIMEOUT * 1000L) {
  85             try {
  86                 ResultSet rs = adHoc.executeQuery("SELECT 1");
  87                 rs.close();
  88                 lastAction = System.currentTimeMillis();
  89                 return;
  90             } catch (SQLException e) {
  91             }
  92             statements.clear();
  93             tryConnect();
  94         }
  95         lastAction = System.currentTimeMillis();
  96     }
  97
  98     private static ThreadLocal<DatabaseConnection> instances = new ThreadLocal<DatabaseConnection>() {
  99
 100         @Override
 101         protected DatabaseConnection initialValue() {
 102             return new DatabaseConnection();
 103         }
 104     };
 105
 106     public static DatabaseConnection getInstance() {
 107         return instances.get();
 108     }
 109
 110     public static boolean isInited() {
 111         return credentials != null;
 112     }
 113
 114     public static void init(Properties conf) {
 115         if (credentials != null) {
 116             throw new Error("Re-initiaizing is forbidden.");
 117         }
 118         credentials = conf;
 119         GigiResultSet rs = getInstance().prepare("SELECT version FROM \"schemeVersion\" ORDER BY version DESC LIMIT 1;").executeQuery();
 120         int version = 0;
 121         if (rs.next()) {
 122             version = rs.getInt(1);
 123         }
 124         if (version == CURRENT_SCHEMA_VERSION) {
 125             return; // Good to go
 126         }
 127         if (version > CURRENT_SCHEMA_VERSION) {
 128             throw new Error("Invalid database version. Please fix this.");
 129         }
 130         upgrade(version);
 131     }
 132
 133     public void beginTransaction() throws SQLException {
 134         c.setAutoCommit(false);
 135     }
 136
 137     private static void upgrade(int version) {
 138         try {
 139             Statement s = getInstance().c.createStatement();
 140             try {
 141                 while (version < CURRENT_SCHEMA_VERSION) {
 142                     try (InputStream resourceAsStream = DatabaseConnection.class.getResourceAsStream("upgrade/from_" + version + ".sql")) {
 143                         if (resourceAsStream == null) {
 144                             throw new Error("Upgrade script from version " + version + " was not found.");
 145                         }
 146                         SQLFileManager.addFile(s, resourceAsStream, ImportType.PRODUCTION);
 147                     }
 148                     version++;
 149                 }
 150                 s.addBatch("UPDATE \"schemeVersion\" SET version='" + version + "'");
 151                 System.out.println("UPGRADING Database to version " + version);
 152                 s.executeBatch();
 153                 System.out.println("done.");
 154             } finally {
 155                 s.close();
 156             }
 157         } catch (SQLException e) {
 158             e.printStackTrace();
 159         } catch (IOException e) {
 160             e.printStackTrace();
 161         }
 162     }
 163
 164     public void commitTransaction() throws SQLException {
 165         c.commit();
 166         c.setAutoCommit(true);
 167     }
 168
 169     public void quitTransaction() {
 170         try {
 171             if ( !c.getAutoCommit()) {
 172                 c.rollback();
 173                 c.setAutoCommit(true);
 174             }
 175         } catch (SQLException e) {
 176             e.printStackTrace();
 177         }
 178     }
 179
 180     public static final String preprocessQuery(String originalQuery) {
 181         originalQuery = originalQuery.replace('`', '"');
 182         if (originalQuery.matches("^INSERT INTO [^ ]+ SET .*")) {
 183             Pattern p = Pattern.compile("INSERT INTO ([^ ]+) SET (.*)");
 184             Matcher m = p.matcher(originalQuery);
 185             if (m.matches()) {
 186                 String replacement = "INSERT INTO " + toIdentifier(m.group(1));
 187                 String[] parts = m.group(2).split(",");
 188                 StringJoiner columns = new StringJoiner(", ");
 189                 StringJoiner values = new StringJoiner(", ");
 190                 for (int i = 0; i < parts.length; i++) {
 191                     String[] split = parts[i].split("=", 2);
 192                     columns.add(toIdentifier(split[0]));
 193                     values.add(split[1]);
 194                 }
 195                 replacement += "(" + columns.toString() + ") VALUES(" + values.toString() + ")";
 196                 return replacement;
 197             }
 198         }
 199
 200         //
 201         return originalQuery;
 202     }
 203
 204     private static CharSequence toIdentifier(String ident) {
 205         ident = ident.trim();
 206         if ( !ident.startsWith("\"")) {
 207             ident = "\"" + ident;
 208         }
 209         if ( !ident.endsWith("\"")) {
 210             ident = ident + "\"";
 211         }
 212         return ident;
 213     }
 214 }