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Versioned Cassandra Schema Migrations For Sane Development
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/*
* Copyright 2015 Ryan Svihla
*
* 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.
*/
package pro.foundev.cassandra.commons.migrations;
import com.datastax.driver.core.ResultSet;
import com.datastax.driver.core.Row;
import com.datastax.driver.core.Session;
import com.datastax.driver.core.Statement;
import com.datastax.driver.mapping.Mapper;
import com.datastax.driver.mapping.MappingManager;
import com.google.common.collect.Lists;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import pro.foundev.cassandra.commons.core.CassandraConfiguration;
import pro.foundev.cassandra.commons.core.CassandraSessionFactory;
import pro.foundev.cassandra.commons.migrations.parsing.MigrationFileName;
import pro.foundev.cassandra.commons.migrations.parsing.MigrationFileNameParser;
import pro.foundev.cassandra.commons.migrations.script_parser.ScriptParser;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Consumer;
/**
* Responsible for reading a given script file and apply migrations
* Script file has implied version number
*/
public class MigrationRunnerImpl implements MigrationRunner {
private final CassandraConfiguration configuration;
private Logger log = LoggerFactory.getLogger("MigrationRunnerLog");
private final MigrationFileNameParser fileParser = new MigrationFileNameParser();
private ScriptParser scriptParser = new ScriptParser();
public MigrationRunnerImpl(String yamlConfig) throws IOException {
this(CassandraConfiguration.parse(yamlConfig));
}
public MigrationRunnerImpl(CassandraConfiguration configuration){
this.configuration = configuration;
}
/**
*/
/**
* Executes all CQL scripts found inside of the specified path. TODO: document file finding rules
*
* @param scriptDirectory Contains cql scripts with the following naming convention:
* [version]_[version].cql version is typically a timestamp and will be applied in
* ascending order.
* @throws FileNotFoundException occurs when unable to find the scriptDirectory.
*/
@Override
public void runScriptDirectory(Path scriptDirectory) throws FileNotFoundException {
if(scriptDirectory==null || !Files.exists(scriptDirectory)){
throw new FileNotFoundException("script directory is not present at :" + scriptDirectory);
}
String keyspace = configuration.getKeyspace();
withSession(session -> {
logAction("migrations starting");
//slightly silly dumping this in one partition, may reconsider later and do client side sorting
session.execute("CREATE TABLE IF NOT EXISTS " + keyspace + ".migrations (migration_set int, version bigint, name text, cql text" +
", PRIMARY KEY(migration_set, version))");
MappingManager manager = new MappingManager(session);
final Mapper mapper = manager.mapper(Migration.class);
ResultSet rows = session.execute("SELECT * FROM migrations where migration_set=0 ORDER BY version DESC");
Row latestMigrationFromDb = rows.one();
Long latestVersionFromDB = 0L;
if (latestMigrationFromDb != null) {
latestVersionFromDB = latestMigrationFromDb.getLong("version");
}
final List migrations = new ArrayList<>();
try {
final Long finalLatestVersionFromDB = latestVersionFromDB;
Files.walkFileTree(scriptDirectory, new SimpleFileVisitor() {
@Override
public FileVisitResult visitFile(Path file,
BasicFileAttributes attrs) throws IOException {
String fileName = file.getFileName().toString();
if(!fileName.endsWith(".cql")){
return FileVisitResult.CONTINUE;
}
MigrationFileName migrationFileName = fileParser.parseFileName(fileName);
String name = migrationFileName.getName();
Long version = migrationFileName.getVersion();
if (version > finalLatestVersionFromDB) {
List statements = scriptParser.parse(file);
Migration migration = new Migration();
migration.setMigrationSet(0);//FIXME hack for now till I figure out what this is
migration.setCqlToRun(statements);
migration.setVersion(version);
migration.setName(name);
migrations.add(migration);
}
return FileVisitResult.CONTINUE;
}
});
//not assuming filesystem returns correct order.
migrations.sort((o1, o2) -> {
if(o1.getVersion()>o2.getVersion()){
return 1;
}else if(o1.getVersion() {
try {
String migrationRun = String.format("running migration: %s with version: %d",
m.getName(), m.getVersion());
logAction(migrationRun);
List executed = Lists.newArrayList();
m.getCqlToRun().forEach(s -> {
String trimmedStatement = null;
try {
trimmedStatement = s.toString().trim();
logAction(trimmedStatement);
session.execute(s);
executed.add(trimmedStatement);
} catch (Exception ex) {
if (executed.size() > 0) {
String executedCQL = String.join(";",executed);
int step = executed.size()+1;
String.format("-- critical error: migration step #%d failed miserably. " +
"We do not know how to recover. Please review the exception and figure out the error in your migration " +
"script, then do the following:\n" +
"1. Make a new script and a new migration\n" +
"2. Fix your script and then add it to the new migration\n" +
"3. Save the migration that was successful with the following " +
"CQL: INSERT INTO migrations (migrations_set, version, name, cql) values\" +\n" +
" \" (%d, %d, '%s', '%s');" +
"Keep an eye out for https://github.com/rssvihla/cassandra-commons/issues/45 which will bring resumable migrations" +
" The CQL that failed was '%s", step,
m.getMigrationSet(),
m.getVersion(),
m.getName(),
executedCQL,
trimmedStatement
);
}else{
throw ex;
}
}
});
} catch (Exception ex) {
String migrationError = String.format("failed migration: %s with version: %d",
m.getName(),
m.getVersion());
logError(migrationError, ex);
throw ex;
}
try {
//FIXME: need to have specific handling for the case when a save fails
mapper.save(m);
} catch (Exception ex) {
logError(
"applied migration: create_table with version: 201510220938 but it failed " +
"writing the migration record to the migration table. Please review the " +
"error fix and manually insert the following CQL in the keyspace you are " +
"running migrations against to resolve the problem:\n" +
"INSERT INTO migrations (migrations_set, version, name, cql) values " +
"(%d, %d, '%s', '%s');", ex);
}
String completedRun = String.format("migration complete: %s with version: %d",
m.getName(), m.getVersion());
logAction(completedRun);
});
} catch (IOException e) {
throw new RuntimeException(e);
}
logAction("migrations successfully completed");
});
}
private void logError(String errorDescription, Throwable ex){
String paddedError = "-- " + errorDescription + " --";
String errorPadding = padString(paddedError.length());
log.error(errorPadding);
log.error(paddedError, ex);
log.error(errorPadding);
}
private void logAction(String actionDescription) {
String paddedDescription = "-- " + actionDescription + " --";
String completedPaddingBuffer = padString(paddedDescription.length());
log.info(completedPaddingBuffer);
log.info(paddedDescription);
log.info(completedPaddingBuffer);
}
private String padString(int length) {
StringBuffer runPaddingBuffer = new StringBuffer();
for (int i = 0; i < length; i++) {
runPaddingBuffer.append("-");
}
return runPaddingBuffer.toString();
}
private void withSession(Consumer sessionConsumer){
CassandraSessionFactory cassandraSessionFactory = null;
try {
cassandraSessionFactory = new CassandraSessionFactory(configuration);
sessionConsumer.accept(cassandraSessionFactory.getSession());
}finally{
if (cassandraSessionFactory != null) {
try {
cassandraSessionFactory.close();
} catch (IOException e) {
throw new RuntimeException("was able to close cassandra session factory");
}
}
}
}
/**
* drops and recreates keyspace. Today it does a simplestrategy of RF 1 on recreate. Not useful for production
*/
@Override
public void resetKeyspace() {
String keyspaceName = configuration.getKeyspace();
withSession(session->{
Row row = session.execute("SELECT * FROM system.schema_keyspaces WHERE keyspace_name='"
+ keyspaceName + "'").one();
if(row!=null) {
String strategyClass = "SimpleStrategy";
String strategyOptions = "'replication_factor':1";
Boolean durableWrites = row.getBool("durable_writes");
session.execute("DROP KEYSPACE " + keyspaceName);
String createCql = "CREATE KEYSPACE " + keyspaceName + " WITH REPLICATION = {'class':'"
+ strategyClass + "', "+ strategyOptions + "} AND DURABLE_WRITES=" + durableWrites;
session.execute(createCql);
}else{
//FIXME place holder I want a proper output message, not an exception
throw new RuntimeException("there is no keyspace by the name of " + keyspaceName);
}
});
}
public void setLog(Logger log) {
this.log = log;
}
}
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