1/*
2 * Copyright (C) 2009 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include "config.h"
32#include "DatabaseTracker.h"
33
34#include "CString.h"
35#include "Database.h"
36#include "DatabaseObserver.h"
37#include "DatabaseThread.h"
38#include "QuotaTracker.h"
39#include "ScriptExecutionContext.h"
40#include "SecurityOrigin.h"
41#include "SecurityOriginHash.h"
42#include "SQLiteFileSystem.h"
43#include <wtf/HashSet.h>
44#include <wtf/MainThread.h>
45#include <wtf/StdLibExtras.h>
46
47namespace WebCore {
48
49DatabaseTracker& DatabaseTracker::tracker()
50{
51    DEFINE_STATIC_LOCAL(DatabaseTracker, tracker, ());
52    return tracker;
53}
54
55DatabaseTracker::DatabaseTracker()
56{
57    SQLiteFileSystem::registerSQLiteVFS();
58}
59
60bool DatabaseTracker::canEstablishDatabase(ScriptExecutionContext*, const String&, const String&, unsigned long)
61{
62    // In Chromium, a database can always be established (even though we might not
63    // be able to write anything to it if the quota for this origin was exceeded)
64    return true;
65}
66
67void DatabaseTracker::setDatabaseDetails(SecurityOrigin*, const String&, const String&, unsigned long)
68{
69    // Chromium sets the database details when the database is opened
70}
71
72String DatabaseTracker::fullPathForDatabase(SecurityOrigin* origin, const String& name, bool)
73{
74    return origin->databaseIdentifier() + "/" + name + "#";
75}
76
77void DatabaseTracker::addOpenDatabase(Database* database)
78{
79    ASSERT(database->scriptExecutionContext()->isContextThread());
80    MutexLocker openDatabaseMapLock(m_openDatabaseMapGuard);
81    if (!m_openDatabaseMap)
82        m_openDatabaseMap.set(new DatabaseOriginMap());
83
84    DatabaseNameMap* nameMap = m_openDatabaseMap->get(database->securityOrigin());
85    if (!nameMap) {
86        nameMap = new DatabaseNameMap();
87        m_openDatabaseMap->set(database->securityOrigin(), nameMap);
88    }
89
90    String name(database->stringIdentifier());
91    DatabaseSet* databaseSet = nameMap->get(name);
92    if (!databaseSet) {
93        databaseSet = new DatabaseSet();
94        nameMap->set(name, databaseSet);
95    }
96
97    databaseSet->add(database);
98
99    DatabaseObserver::databaseOpened(database);
100}
101
102class TrackerRemoveOpenDatabaseTask : public ScriptExecutionContext::Task {
103public:
104    static PassOwnPtr<TrackerRemoveOpenDatabaseTask> create(PassRefPtr<Database> database)
105    {
106        return new TrackerRemoveOpenDatabaseTask(database);
107    }
108
109    virtual void performTask(ScriptExecutionContext* context)
110    {
111        DatabaseTracker::tracker().removeOpenDatabase(m_database.get());
112    }
113
114private:
115    TrackerRemoveOpenDatabaseTask(PassRefPtr<Database> database)
116        : m_database(database)
117    {
118    }
119
120    RefPtr<Database> m_database;
121};
122
123void DatabaseTracker::removeOpenDatabase(Database* database)
124{
125    if (!database->scriptExecutionContext()->isContextThread()) {
126        database->scriptExecutionContext()->postTask(TrackerRemoveOpenDatabaseTask::create(database));
127        return;
128    }
129
130    MutexLocker openDatabaseMapLock(m_openDatabaseMapGuard);
131    ASSERT(m_openDatabaseMap);
132    DatabaseNameMap* nameMap = m_openDatabaseMap->get(database->securityOrigin());
133    ASSERT(nameMap);
134    String name(database->stringIdentifier());
135    DatabaseSet* databaseSet = nameMap->get(name);
136    ASSERT(databaseSet);
137    databaseSet->remove(database);
138
139    if (databaseSet->isEmpty()) {
140        nameMap->remove(name);
141        delete databaseSet;
142        if (nameMap->isEmpty()) {
143            m_openDatabaseMap->remove(database->securityOrigin());
144            delete nameMap;
145        }
146    }
147
148    DatabaseObserver::databaseClosed(database);
149}
150
151
152void DatabaseTracker::getOpenDatabases(SecurityOrigin* origin, const String& name, HashSet<RefPtr<Database> >* databases)
153{
154    MutexLocker openDatabaseMapLock(m_openDatabaseMapGuard);
155    if (!m_openDatabaseMap)
156        return;
157
158    DatabaseNameMap* nameMap = m_openDatabaseMap->get(origin);
159    if (!nameMap)
160        return;
161
162    DatabaseSet* databaseSet = nameMap->get(name);
163    if (!databaseSet)
164        return;
165
166    for (DatabaseSet::iterator it = databaseSet->begin(); it != databaseSet->end(); ++it)
167        databases->add(*it);
168}
169
170unsigned long long DatabaseTracker::getMaxSizeForDatabase(const Database* database)
171{
172    ASSERT(currentThread() == database->scriptExecutionContext()->databaseThread()->getThreadID());
173    unsigned long long spaceAvailable = 0;
174    unsigned long long databaseSize = 0;
175    QuotaTracker::instance().getDatabaseSizeAndSpaceAvailableToOrigin(
176        database->securityOrigin()->databaseIdentifier(),
177        database->stringIdentifier(), &databaseSize, &spaceAvailable);
178    return databaseSize + spaceAvailable;
179}
180
181}
182