1 package org.cacert.gigi.database;
3 import java.io.IOException;
4 import java.io.InputStream;
5 import java.io.PrintWriter;
6 import java.sql.Connection;
7 import java.sql.DriverManager;
8 import java.sql.PreparedStatement;
9 import java.sql.ResultSet;
10 import java.sql.SQLException;
11 import java.sql.Statement;
12 import java.util.HashMap;
13 import java.util.HashSet;
14 import java.util.Map.Entry;
15 import java.util.Properties;
16 import java.util.StringJoiner;
17 import java.util.regex.Matcher;
18 import java.util.regex.Pattern;
20 import org.cacert.gigi.database.SQLFileManager.ImportType;
22 public class DatabaseConnection {
24 public static final int CURRENT_SCHEMA_VERSION = 6;
26 public static final int CONNECTION_TIMEOUT = 24 * 60 * 60;
30 private HashMap<String, PreparedStatement> statements = new HashMap<String, PreparedStatement>();
32 HashSet<PreparedStatement> underUse = new HashSet<>();
34 private static Properties credentials;
36 private Statement adHoc;
38 public DatabaseConnection() {
40 Class.forName(credentials.getProperty("sql.driver"));
41 } catch (ClassNotFoundException e) {
48 private void tryConnect() {
50 c = DriverManager.getConnection(credentials.getProperty("sql.url") + "?socketTimeout=" + CONNECTION_TIMEOUT, credentials.getProperty("sql.user"), credentials.getProperty("sql.password"));
51 adHoc = c.createStatement();
52 } catch (SQLException e) {
57 protected synchronized PreparedStatement prepareInternal(String query) throws SQLException {
59 query = preprocessQuery(query);
60 PreparedStatement statement = statements.get(query);
61 if (statement != null) {
62 if (underUse.add(statement)) {
65 throw new Error("Statement in Use");
68 statement = c.prepareStatement(query, query.startsWith("SELECT ") ? Statement.NO_GENERATED_KEYS : Statement.RETURN_GENERATED_KEYS);
69 statements.put(query, statement);
70 if (underUse.add(statement)) {
73 throw new Error("Statement in Use");
77 protected synchronized PreparedStatement prepareInternalScrollable(String query) throws SQLException {
79 query = preprocessQuery(query);
80 PreparedStatement statement = statements.get("__SCROLLABLE__! " + query);
81 if (statement != null) {
82 if (underUse.add(statement)) {
85 throw new Error("Statement in Use");
88 statement = c.prepareStatement(query, ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
89 statements.put("__SCROLLABLE__! " + query, statement);
90 if (underUse.add(statement)) {
93 throw new Error("Statement in Use");
97 private long lastAction = System.currentTimeMillis();
99 private void ensureOpen() {
100 if (System.currentTimeMillis() - lastAction > CONNECTION_TIMEOUT * 1000L) {
102 ResultSet rs = adHoc.executeQuery("SELECT 1");
104 lastAction = System.currentTimeMillis();
106 } catch (SQLException e) {
111 lastAction = System.currentTimeMillis();
114 private static DatabaseConnection instance;
116 public static DatabaseConnection getInstance() {
117 if (instance == null) {
118 synchronized (DatabaseConnection.class) {
119 if (instance == null) {
120 instance = new DatabaseConnection();
127 public static boolean isInited() {
128 return credentials != null;
131 public static void init(Properties conf) {
132 if (credentials != null) {
133 throw new Error("Re-initiaizing is forbidden.");
137 try (GigiPreparedStatement gigiPreparedStatement = new GigiPreparedStatement("SELECT version FROM \"schemeVersion\" ORDER BY version DESC LIMIT 1;")) {
138 GigiResultSet rs = gigiPreparedStatement.executeQuery();
140 version = rs.getInt(1);
143 if (version == CURRENT_SCHEMA_VERSION) {
144 return; // Good to go
146 if (version > CURRENT_SCHEMA_VERSION) {
147 throw new Error("Invalid database version. Please fix this.");
152 public void beginTransaction() throws SQLException {
153 c.setAutoCommit(false);
156 private static void upgrade(int version) {
158 Statement s = getInstance().c.createStatement();
160 while (version < CURRENT_SCHEMA_VERSION) {
161 try (InputStream resourceAsStream = DatabaseConnection.class.getResourceAsStream("upgrade/from_" + version + ".sql")) {
162 if (resourceAsStream == null) {
163 throw new Error("Upgrade script from version " + version + " was not found.");
165 SQLFileManager.addFile(s, resourceAsStream, ImportType.PRODUCTION);
169 s.addBatch("UPDATE \"schemeVersion\" SET version='" + version + "'");
170 System.out.println("UPGRADING Database to version " + version);
172 System.out.println("done.");
176 } catch (SQLException e) {
178 } catch (IOException e) {
183 public void commitTransaction() throws SQLException {
185 c.setAutoCommit(true);
188 public void quitTransaction() {
190 if ( !c.getAutoCommit()) {
192 c.setAutoCommit(true);
194 } catch (SQLException e) {
199 public static final String preprocessQuery(String originalQuery) {
200 originalQuery = originalQuery.replace('`', '"');
201 if (originalQuery.matches("^INSERT INTO [^ ]+ SET .*")) {
202 Pattern p = Pattern.compile("INSERT INTO ([^ ]+) SET (.*)");
203 Matcher m = p.matcher(originalQuery);
205 String replacement = "INSERT INTO " + toIdentifier(m.group(1));
206 String[] parts = m.group(2).split(",");
207 StringJoiner columns = new StringJoiner(", ");
208 StringJoiner values = new StringJoiner(", ");
209 for (int i = 0; i < parts.length; i++) {
210 String[] split = parts[i].split("=", 2);
211 columns.add(toIdentifier(split[0]));
212 values.add(split[1]);
214 replacement += "(" + columns.toString() + ") VALUES(" + values.toString() + ")";
220 return originalQuery;
223 private static CharSequence toIdentifier(String ident) {
224 ident = ident.trim();
225 if ( !ident.startsWith("\"")) {
226 ident = "\"" + ident;
228 if ( !ident.endsWith("\"")) {
229 ident = ident + "\"";
234 protected synchronized void returnStatement(PreparedStatement target) {
235 underUse.remove(target);
238 public void lockedStatements(PrintWriter writer) {
239 writer.println(underUse.size());
240 for (PreparedStatement ps : underUse) {
241 for (Entry<String, PreparedStatement> e : statements.entrySet()) {
242 if (e.getValue() == ps) {
243 writer.println("<br/>");
244 writer.println(e.getKey());