Source Code Cross Referenced for PostgreSQLSplitPlainTextBackuper.java in  » Database-JDBC-Connection-Pool » sequoia-2.10.9 » org » continuent » sequoia » controller » backup » backupers » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database JDBC Connection Pool » sequoia 2.10.9 » org.continuent.sequoia.controller.backup.backupers 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**
002:         * Sequoia: Database clustering technology.
003:         * Copyright (C) 2005 Emic Networks
004:         * Contact: sequoia@continuent.org
005:         * 
006:         * Licensed under the Apache License, Version 2.0 (the "License");
007:         * you may not use this file except in compliance with the License.
008:         * You may obtain a copy of the License at
009:         * 
010:         * http://www.apache.org/licenses/LICENSE-2.0
011:         * 
012:         * Unless required by applicable law or agreed to in writing, software
013:         * distributed under the License is distributed on an "AS IS" BASIS,
014:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015:         * See the License for the specific language governing permissions and
016:         * limitations under the License. 
017:         *
018:         * Initial developer(s): Emmanuel Cecchet.
019:         * Contributor(s): Dylan Hansen, Mathieu Peltier, Olivier Fambon.
020:         * 
021:         */package org.continuent.sequoia.controller.backup.backupers;
022:
023:        import java.io.File;
024:        import java.io.FilenameFilter;
025:        import java.io.IOException;
026:        import java.util.ArrayList;
027:        import java.util.Date;
028:
029:        import org.continuent.sequoia.common.exceptions.BackupException;
030:        import org.continuent.sequoia.common.log.Trace;
031:        import org.continuent.sequoia.controller.backend.DatabaseBackend;
032:        import org.continuent.sequoia.controller.backup.BackupManager;
033:        import org.continuent.sequoia.controller.backup.DumpTransferInfo;
034:
035:        /**
036:         * This class defines a Backuper for PostgreSQL databases. This backuper makes
037:         * dumps in a plain-text format.
038:         * *****************************************************************************
039:         * This class backups PostgreSQL database usig pg_dump. backup command from
040:         * console executes the pg_dump with split, and example pg_dump dbName -h
041:         * 127.0.0.1 -p 5432 -U postgres | split -a 4 -b 10m - /tmp/dumpFile which does
042:         * spliting ONE single dump file to splitted files. Size of the splitted files
043:         * are determined by virtual xml file in options for Backuper, and example
044:         * <Backuper backuperName="splitter"
045:         * className="org.continuent.sequoia.controller.backup.backupers.PostgreSQLSplitPlainTextBackuper"
046:         * options="zip=true,splitSize=10m"/> default size is 1000m Restore command
047:         * restores the DB from splitted files, and example cat /tmp/dumpFile* | psql
048:         * dbName -h 127.0.0.1 -p 5432 -U postgres restore checks the existing of dump
049:         * file for first suffix dumpFileaaaa (suffix is set to 4) Contributer also
050:         * added two methods and one varibale to AbstractPostgreSQLBackuper class
051:         * protected String[] makeSplitCommand(String command, PostgreSQLUrlInfo info,
052:         * String options, String login) protected String[]
053:         * makeSplitCommandWithAuthentication(String command, PostgreSQLUrlInfo info,
054:         * String options, String login, String password, boolean isPsql) static
055:         * protected String SPLIT_SIZE = "1000m"; Contributor for this class: Gurkan
056:         * Ozfidan
057:         * *****************************************************************************
058:         * <p>
059:         * Supported URLs are:
060:         * <ul>
061:         * <li>jdbc:postgresql://host:port/dbname?param1=foo,param2=bar</li>
062:         * <li>jdbc:postgresql://host/dbname?param1=foo,param2=bar</li>
063:         * <li>jdbc:postgresql:dbname?param1=foo,param2=bar</li>
064:         * </ul>
065:         * 
066:         * @author <a href="mailto:emmanuel.cecchet@emicnetworks.com">Emmanuel Cecchet</a>
067:         * @author <a href="mailto:dhansen@h2st.com">Dylan Hansen</a>
068:         * @author <a href="mailto:mathieu.peltier@emicnetworks.com">Mathieu Peltier</a>
069:         * @author <a href="mailto:olivier.fambon@emicnetworks.com">Olivier Fambon</a>
070:         * @version 1.0
071:         */
072:        public class PostgreSQLSplitPlainTextBackuper extends
073:                AbstractPostgreSQLBackuper {
074:            // Logger
075:            static Trace logger = Trace
076:                    .getLogger(PostgreSQLSplitPlainTextBackuper.class.getName());
077:
078:            /**
079:             * The dump format for this (family of) backuper.
080:             */
081:            public static final String DUMP_FORMAT = "PostgreSQL Split Plain Text Dump";
082:
083:            /**
084:             * @see org.continuent.sequoia.controller.backup.Backuper#getDumpFormat()
085:             */
086:            public String getDumpFormat() {
087:                return DUMP_FORMAT;
088:            }
089:
090:            /**
091:             * Backups the DB using pg_dump/split commands; It creates splitted dump files
092:             * instead of one single(huge) dump file
093:             * 
094:             * @see org.continuent.sequoia.controller.backup.Backuper#backup(DatabaseBackend,
095:             *      String, String, String, String, ArrayList)
096:             */
097:            public Date backup(DatabaseBackend backend, String login,
098:                    String password, String dumpName, String path,
099:                    ArrayList tables) throws BackupException {
100:                // Parse the URL for the connection information
101:                String url = backend.getURL();
102:                PostgreSQLUrlInfo info = new AbstractPostgreSQLBackuper.PostgreSQLUrlInfo(
103:                        url);
104:
105:                if (logger.isDebugEnabled())
106:                    logger.debug("Backing up database '" + info.getDbName()
107:                            + "' on host '" + info.getHost() + ":"
108:                            + info.getPort() + "'");
109:
110:                try {
111:
112:                    // Create the path, if it does not already exist
113:                    File pathDir = new File(path);
114:                    if (!pathDir.exists()) {
115:                        pathDir.mkdirs();
116:                        pathDir.mkdir();
117:                    }
118:
119:                    String fullPath = getDumpPhysicalPath(path, dumpName);
120:
121:                    int exitValue = -1;
122:                    if (useAuthentication) {
123:                        if (logger.isDebugEnabled())
124:                            logger
125:                                    .debug("Performing backup using authentication");
126:
127:                        String[] gCmd = makeSplitCommandWithAuthentication(
128:                                "pg_dump", info, " | split -a 4 -b 10m - "
129:                                        + fullPath, login, password, false);
130:
131:                        exitValue = executeNativeCommand(gCmd);
132:                    } else {
133:                        String[] gCmdArray = makeSplitCommand("pg_dump", info,
134:                                " | split -a 4 -b " + splitSize + " - "
135:                                        + fullPath, login);
136:
137:                        exitValue = executeNativeCommand(gCmdArray);
138:                    }
139:
140:                    if (exitValue != 0) {
141:                        printErrors();
142:                        throw new BackupException(
143:                                "pg_dump execution did not complete successfully!");
144:                    }
145:
146:                } catch (Exception e) {
147:                    String msg = "Error while performing backup";
148:                    logger.error(msg, e);
149:                    throw new BackupException(msg, e);
150:                }
151:
152:                return new Date(System.currentTimeMillis());
153:            }
154:
155:            /**
156:             * Restores the DB using cat/psql commands; It restores the DB using splitted
157:             * dump files.
158:             * 
159:             * @see org.continuent.sequoia.controller.backup.Backuper#restore(DatabaseBackend,
160:             *      String, String, String, String, ArrayList)
161:             */
162:            public void restore(DatabaseBackend backend, String login,
163:                    String password, String dumpName, String path,
164:                    ArrayList tables) throws BackupException {
165:                // Parse the URL for the connection information
166:                String url = backend.getURL();
167:                PostgreSQLUrlInfo info = new AbstractPostgreSQLBackuper.PostgreSQLUrlInfo(
168:                        url);
169:
170:                if (logger.isDebugEnabled())
171:                    logger.debug("Restoring database '" + info.getDbName()
172:                            + "' on host '" + info.getHost() + ":"
173:                            + info.getPort() + "'");
174:
175:                // Check to see if the given path + dumpName exists
176:                String fullPath = getDumpPhysicalPath(path, dumpName);
177:
178:                File dump = new File(fullPath + "aaaa");// checking only first split file,
179:                // suffix length is 4
180:                if (!dump.exists())
181:                    throw new BackupException("Backup '" + fullPath
182:                            + "' does not exist!");
183:
184:                try {
185:                    if (useAuthentication) {
186:                        if (logger.isInfoEnabled())
187:                            logger
188:                                    .info("Performing database operations using authentication");
189:
190:                        // Drop the database if it already exists
191:                        if (logger.isDebugEnabled())
192:                            logger.debug("Dropping database '"
193:                                    + info.getDbName() + "'");
194:
195:                        String[] dropCmd = makeCommandWithAuthentication(
196:                                "dropdb", info, "", login, password, false);
197:                        if (executeNativeCommand(dropCmd) != 0) {
198:                            printErrors();
199:                            throw new BackupException(
200:                                    "dropdb execution did not complete successfully!");
201:                        }
202:
203:                        // Re-create the database, use the specified encoding if provided
204:                        if (logger.isDebugEnabled())
205:                            logger.debug("Re-creating '" + info.getDbName()
206:                                    + "'");
207:
208:                        String[] createCmd = makeCommandWithAuthentication(
209:                                "createdb", info,
210:                                encoding != null ? "--encoding=" + encoding
211:                                        + " " : "", login, password, false);
212:                        if (executeNativeCommand(createCmd) != 0) {
213:                            printErrors();
214:                            throw new BackupException(
215:                                    "createdb execution did not complete successfully!");
216:                        }
217:
218:                        // Run a pre-restore script, if specified
219:                        if (preRestoreScript != null) {
220:                            if (logger.isDebugEnabled())
221:                                logger.debug("Running pre-restore script '"
222:                                        + preRestoreScript + "' on '"
223:                                        + info.getDbName() + "'");
224:
225:                            String[] preRestoreCmd = makeCommandWithAuthentication(
226:                                    "psql", info, " -f " + preRestoreScript,
227:                                    login, password, true);
228:
229:                            if (executeNativeCommand(preRestoreCmd) != 0) {
230:                                printErrors();
231:                                throw new BackupException(
232:                                        "psql execution did not complete successfully!");
233:                            }
234:                        }
235:
236:                        // Use the psql command to rebuild the database
237:                        if (logger.isDebugEnabled())
238:                            logger.debug("Rebuilding '" + info.getDbName()
239:                                    + "' from dump '" + dumpName + "'");
240:
241:                        String[] replayCmd = makeSplitCommandWithAuthentication(
242:                                "cat" + " " + fullPath + "* | psql", info, "",
243:                                login, password, false);
244:
245:                        if (executeNativeCommand(replayCmd) != 0) {
246:                            printErrors();
247:                            throw new BackupException(
248:                                    "pg_restore execution did not complete successfully!");
249:                        }
250:
251:                        // Run a post-restore script, if specified
252:                        if (postRestoreScript != null) {
253:                            if (logger.isDebugEnabled())
254:                                logger.debug("Running post-restore script '"
255:                                        + postRestoreScript + "' on '"
256:                                        + info.getDbName() + "'");
257:
258:                            String[] postRestoreCmd = makeCommandWithAuthentication(
259:                                    "psql", info, " -f " + postRestoreScript,
260:                                    login, password, true);
261:
262:                            if (executeNativeCommand(postRestoreCmd) != 0) {
263:                                printErrors();
264:                                throw new BackupException(
265:                                        "psql execution did not complete successfully!");
266:                            }
267:                        }
268:                    } else
269:                    // No authentication
270:                    {
271:                        // Drop the database if it already exists
272:                        if (logger.isDebugEnabled())
273:                            logger.debug("Dropping database '"
274:                                    + info.getDbName() + "'");
275:
276:                        String dropCmd = makeCommand("dropdb", info, "", login);
277:                        if (executeNativeCommand(dropCmd) != 0) {
278:                            printErrors();
279:                            throw new BackupException(
280:                                    "dropdb execution did not complete successfully!");
281:                        }
282:
283:                        // Re-create the database, use the specified encoding if provided
284:                        if (logger.isDebugEnabled())
285:                            logger.debug("Re-creating '" + info.getDbName()
286:                                    + "'");
287:
288:                        String createCmd = makeCommand("createdb", info,
289:                                encoding != null ? "--encoding=" + encoding
290:                                        + " " : "", login);
291:                        if (executeNativeCommand(createCmd) != 0) {
292:                            printErrors();
293:                            throw new BackupException(
294:                                    "createdb execution did not complete successfully!");
295:                        }
296:
297:                        // Run a pre-restore script, if specified
298:                        if (preRestoreScript != null) {
299:                            if (logger.isDebugEnabled())
300:                                logger.debug("Running pre-restore script '"
301:                                        + preRestoreScript + "' on '"
302:                                        + info.getDbName() + "'");
303:
304:                            String preRestoreCmd = makeCommand("psql", info,
305:                                    " -f " + preRestoreScript, login);
306:                            if (executeNativeCommand(preRestoreCmd) != 0) {
307:                                printErrors();
308:                                throw new BackupException(
309:                                        "psql execution did not complete successfully!");
310:                            }
311:                        }
312:
313:                        // Use the psql command to rebuild the database
314:                        if (logger.isDebugEnabled())
315:                            logger.debug("Rebuilding '" + info.getDbName()
316:                                    + "' from dump '" + dumpName + "'");
317:
318:                        String[] cmdArray = makeSplitCommand("cat" + " "
319:                                + fullPath + "* | psql", info, "", login);
320:
321:                        if (executeNativeCommand(cmdArray) != 0) {
322:                            printErrors();
323:                            throw new BackupException(
324:                                    "psql execution did not complete successfully!");
325:                        }
326:
327:                        // Run a post-restore script, if specified
328:                        if (postRestoreScript != null) {
329:                            if (logger.isDebugEnabled())
330:                                logger.debug("Running post-restore script '"
331:                                        + postRestoreScript + "' on '"
332:                                        + info.getDbName() + "'");
333:
334:                            String postRestoreCmd = makeCommand("psql", info,
335:                                    " -f " + postRestoreScript, login);
336:                            if (executeNativeCommand(postRestoreCmd) != 0) {
337:                                printErrors();
338:                                throw new BackupException(
339:                                        "psql execution did not complete successfully!");
340:                            }
341:                        }
342:
343:                    }
344:                } catch (Exception e) {
345:                    String msg = "Error while performing backup";
346:                    logger.error(msg, e);
347:                    throw new BackupException(msg, e);
348:                }
349:            }
350:
351:            /**
352:             * @see org.continuent.sequoia.controller.backup.Backuper#fetchDump(org.continuent.sequoia.controller.backup.DumpTransferInfo,
353:             *      java.lang.String, java.lang.String)
354:             */
355:            public void fetchDump(DumpTransferInfo dumpTransferInfo,
356:                    String path, String dumpName) throws BackupException,
357:                    IOException {
358:                BackupManager.fetchDumpFile(dumpTransferInfo, path, dumpName
359:                        + ".sql");
360:            }
361:
362:            /**
363:             * @see org.continuent.sequoia.controller.backup.Backuper#deleteDump(java.lang.String,
364:             *      java.lang.String)
365:             */
366:            public void deleteDump(String path, String dumpName)
367:                    throws BackupException {
368:                File dir = new File(path);
369:
370:                // Only list files that start with the given dump name
371:                String[] files = dir.list(new DumpNameFilter(dumpName));
372:
373:                for (int i = 0; i < files.length; i++) {
374:                    File toRemove = new File(
375:                            getDumpPhysicalPath(path, files[i]));
376:                    if (logger.isDebugEnabled())
377:                        logger.debug("Deleting dump " + toRemove);
378:                    toRemove.delete();
379:                }
380:            }
381:
382:            /**
383:             * Private class that filters files based on beginning of file name. This
384:             * should be equal to the dump file(s) we want to delete.
385:             * 
386:             * @author Dylan Hansen
387:             */
388:            class DumpNameFilter implements  FilenameFilter {
389:                private String dumpName;
390:
391:                /**
392:                 * Creates a new instance of DumpNameFilter
393:                 * 
394:                 * @param dumpName Dump name for set of file(s)
395:                 * @author Dylan Hansen
396:                 */
397:                public DumpNameFilter(String dumpName) {
398:                    this .dumpName = dumpName;
399:                }
400:
401:                /**
402:                 * Does this file match the filter?
403:                 * 
404:                 * @param dir Directory of file, not used
405:                 * @param theDump Name of current dump we're checking
406:                 * @author Dylan Hansen
407:                 */
408:                public boolean accept(File dir, String theDump) {
409:                    return (theDump.startsWith(dumpName) && theDump.length() == dumpName
410:                            .length() + 4);
411:                }
412:            }
413:
414:        }
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