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/**
* Copyright 2009 Google Inc.
*
* 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.
*/
import("sqlbase.sqlobj");
import("etherpad.pad.model");
import("etherpad.pad.easysync2migration");
import("sqlbase.sqlcommon");
import("sqlbase.sqlobj");
import("etherpad.log");
import("etherpad.pne.pne_utils");
jimport("java.util.concurrent.ConcurrentHashMap");
jimport("java.lang.System");
jimport("java.util.ArrayList");
jimport("java.util.Collections");
function onStartup() {
if (! appjet.cache.pad_migrations) {
appjet.cache.pad_migrations = {};
}
// this part can be removed when all pads are migrated on pad.spline.inf.fu-berlin.de
//if (! pne_utils.isPNE()) {
// System.out.println("Building cache for live migrations...");
// initLiveMigration();
//}
}
function initLiveMigration() {
if (! appjet.cache.pad_migrations) {
appjet.cache.pad_migrations = {};
}
appjet.cache.pad_migrations.doingAnyLiveMigrations = true;
appjet.cache.pad_migrations.doingBackgroundLiveMigrations = true;
appjet.cache.pad_migrations.padMap = new ConcurrentHashMap();
// presence of a pad in padMap indicates migration is needed
var padMap = _padMap();
var migrationsNeeded = sqlobj.selectMulti("PAD_SQLMETA", {version: 1});
migrationsNeeded.forEach(function(obj) {
padMap.put(String(obj.id), {from: obj.version});
});
}
function _padMap() {
return appjet.cache.pad_migrations.padMap;
}
function _doingItLive() {
return !! appjet.cache.pad_migrations.doingAnyLiveMigrations;
}
function checkPadStatus(padId) {
if (! _doingItLive()) {
return "ready";
}
var info = _padMap().get(padId);
if (! info) {
return "ready";
}
else if (info.migrating) {
return "migrating";
}
else {
return "oldversion";
}
}
function ensureMigrated(padId, async) {
if (! _doingItLive()) {
return false;
}
var info = _padMap().get(padId);
if (! info) {
// pad is up-to-date
return false;
}
else if (async && info.migrating) {
// pad is already being migrated, don't wait on the lock
return false;
}
return model.doWithPadLock(padId, function() {
// inside pad lock...
var info = _padMap().get(padId);
if (!info) {
return false;
}
// migrate from version 1 to version 2 in a transaction
var migrateSucceeded = false;
try {
info.migrating = true;
log.info("Migrating pad "+padId+" from version 1 to version 2...");
var success = false;
var whichTry = 1;
while ((! success) && whichTry <= 3) {
success = sqlcommon.inTransaction(function() {
try {
easysync2migration.migratePad(padId);
sqlobj.update("PAD_SQLMETA", {id: padId}, {version: 2});
return true;
}
catch (e if (e.toString().indexOf("try restarting transaction") >= 0)) {
whichTry++;
return false;
}
});
if (! success) {
java.lang.Thread.sleep(Math.floor(Math.random()*200));
}
}
if (! success) {
throw new Error("too many retries");
}
migrateSucceeded = true;
log.info("Migrated pad "+padId+".");
_padMap().remove(padId);
}
finally {
info.migrating = false;
if (! migrateSucceeded) {
log.info("Migration failed for pad "+padId+".");
throw new Error("Migration failed for pad "+padId+".");
}
}
return true;
});
}
function numUnmigratedPads() {
if (! _doingItLive()) {
return 0;
}
return _padMap().size();
}
////////// BACKGROUND MIGRATIONS
function _logPadMigration(runnerId, padNumber, padTotal, timeMs, fourCharResult, padId) {
log.custom("pad_migrations", {
runnerId: runnerId,
padNumber: Math.round(padNumber+1),
padTotal: Math.round(padTotal),
timeMs: Math.round(timeMs),
fourCharResult: fourCharResult,
padId: padId});
}
function _getNeededMigrationsArrayList(filter) {
var L = new ArrayList(_padMap().keySet());
for(var i=L.size()-1; i>=0; i--) {
if (! filter(String(L.get(i)))) {
L.remove(i);
}
}
return L;
}
function runBackgroundMigration(residue, modulus, runnerId) {
var L = _getNeededMigrationsArrayList(function(padId) {
return (padId.charCodeAt(0) % modulus) == residue;
});
Collections.shuffle(L);
var totalPads = L.size();
for(var i=0;i<totalPads;i++) {
if (! appjet.cache.pad_migrations.doingBackgroundLiveMigrations) {
break;
}
var padId = L.get(i);
var result = "FAIL";
var t1 = System.currentTimeMillis();
try {
if (ensureMigrated(padId, true)) {
result = " OK "; // migrated successfully
}
else {
result = " -- "; // no migration needed after all
}
}
catch (e) {
// e just says "migration failed", but presumably
// inTransaction() printed a stack trace.
// result == "FAIL", do nothing.
}
var t2 = System.currentTimeMillis();
_logPadMigration(runnerId, i, totalPads, t2 - t1, result, padId);
}
}
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