1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
/*
* Copyright (C) 2010 Google Inc. All rights reserved.
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "SQLTransactionBackendSync.h"
#if ENABLE(SQL_DATABASE)
#include "DatabaseAuthorizer.h"
#include "DatabaseBackendContext.h"
#include "DatabaseSync.h"
#include "SQLException.h"
#include "SQLResultSet.h"
#include "SQLStatementSync.h"
#include "SQLTransactionClient.h"
#include "SQLTransactionSync.h"
#include "SQLTransactionSyncCallback.h"
#include "SQLValue.h"
#include "SQLiteTransaction.h"
#include "ScriptExecutionContext.h"
#include <wtf/PassRefPtr.h>
#include <wtf/RefPtr.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
SQLTransactionBackendSync::SQLTransactionBackendSync(DatabaseSync* db, PassRefPtr<SQLTransactionSyncCallback> callback, bool readOnly)
: m_database(db)
, m_callback(callback)
, m_readOnly(readOnly)
, m_hasVersionMismatch(false)
, m_modifiedDatabase(false)
, m_transactionClient(adoptPtr(new SQLTransactionClient()))
{
ASSERT(m_database->scriptExecutionContext()->isContextThread());
}
SQLTransactionBackendSync::~SQLTransactionBackendSync()
{
ASSERT(m_database->scriptExecutionContext()->isContextThread());
if (m_sqliteTransaction && m_sqliteTransaction->inProgress())
rollback();
}
PassRefPtr<SQLResultSet> SQLTransactionBackendSync::executeSQL(const String& sqlStatement, const Vector<SQLValue>& arguments, ExceptionCode& ec)
{
ASSERT(m_database->scriptExecutionContext()->isContextThread());
m_database->setLastErrorMessage("");
if (!m_database->opened()) {
m_database->setLastErrorMessage("cannot executeSQL because the database is not open");
ec = SQLException::UNKNOWN_ERR;
return 0;
}
if (m_hasVersionMismatch) {
m_database->setLastErrorMessage("cannot executeSQL because there is a version mismatch");
ec = SQLException::VERSION_ERR;
return 0;
}
if (sqlStatement.isEmpty())
return 0;
int permissions = DatabaseAuthorizer::ReadWriteMask;
if (!m_database->databaseContext()->allowDatabaseAccess())
permissions |= DatabaseAuthorizer::NoAccessMask;
else if (m_readOnly)
permissions |= DatabaseAuthorizer::ReadOnlyMask;
SQLStatementSync statement(sqlStatement, arguments, permissions);
m_database->resetAuthorizer();
bool retryStatement = true;
RefPtr<SQLResultSet> resultSet;
while (retryStatement) {
retryStatement = false;
resultSet = statement.execute(m_database.get(), ec);
if (!resultSet) {
if (m_sqliteTransaction->wasRolledBackBySqlite())
return 0;
if (ec == SQLException::QUOTA_ERR) {
if (m_transactionClient->didExceedQuota(database())) {
ec = 0;
retryStatement = true;
} else {
m_database->setLastErrorMessage("there was not enough remaining storage space");
return 0;
}
}
}
}
if (m_database->lastActionChangedDatabase())
m_modifiedDatabase = true;
return resultSet.release();
}
ExceptionCode SQLTransactionBackendSync::begin()
{
ASSERT(m_database->scriptExecutionContext()->isContextThread());
if (!m_database->opened()) {
m_database->setLastErrorMessage("cannot begin transaction because the database is not open");
return SQLException::UNKNOWN_ERR;
}
ASSERT(!m_database->sqliteDatabase().transactionInProgress());
// Set the maximum usage for this transaction if this transactions is not read-only.
if (!m_readOnly)
m_database->sqliteDatabase().setMaximumSize(m_database->maximumSize());
ASSERT(!m_sqliteTransaction);
m_sqliteTransaction = adoptPtr(new SQLiteTransaction(m_database->sqliteDatabase(), m_readOnly));
m_database->resetDeletes();
m_database->disableAuthorizer();
m_sqliteTransaction->begin();
m_database->enableAuthorizer();
// Check if begin() succeeded.
if (!m_sqliteTransaction->inProgress()) {
ASSERT(!m_database->sqliteDatabase().transactionInProgress());
m_database->setLastErrorMessage("unable to begin transaction",
m_database->sqliteDatabase().lastError(), m_database->sqliteDatabase().lastErrorMsg());
m_sqliteTransaction.clear();
return SQLException::DATABASE_ERR;
}
// Note: We intentionally retrieve the actual version even with an empty expected version.
// In multi-process browsers, we take this opportinutiy to update the cached value for
// the actual version. In single-process browsers, this is just a map lookup.
String actualVersion;
if (!m_database->getActualVersionForTransaction(actualVersion)) {
m_database->setLastErrorMessage("unable to read version",
m_database->sqliteDatabase().lastError(), m_database->sqliteDatabase().lastErrorMsg());
rollback();
return SQLException::DATABASE_ERR;
}
m_hasVersionMismatch = !m_database->expectedVersion().isEmpty() && (m_database->expectedVersion() != actualVersion);
return 0;
}
ExceptionCode SQLTransactionBackendSync::execute()
{
ASSERT(m_database->scriptExecutionContext()->isContextThread());
if (!m_database->opened() || (m_callback && !m_callback->handleEvent(SQLTransactionSync::from(this)))) {
if (m_database->lastErrorMessage().isEmpty())
m_database->setLastErrorMessage("failed to execute transaction callback");
m_callback = 0;
return SQLException::UNKNOWN_ERR;
}
m_callback = 0;
return 0;
}
ExceptionCode SQLTransactionBackendSync::commit()
{
ASSERT(m_database->scriptExecutionContext()->isContextThread());
if (!m_database->opened()) {
m_database->setLastErrorMessage("unable to commit transaction because the database is not open.");
return SQLException::UNKNOWN_ERR;
}
ASSERT(m_sqliteTransaction);
m_database->disableAuthorizer();
m_sqliteTransaction->commit();
m_database->enableAuthorizer();
// If the commit failed, the transaction will still be marked as "in progress"
if (m_sqliteTransaction->inProgress()) {
m_database->setLastErrorMessage("unable to commit transaction",
m_database->sqliteDatabase().lastError(), m_database->sqliteDatabase().lastErrorMsg());
return SQLException::DATABASE_ERR;
}
m_sqliteTransaction.clear();
// Vacuum the database if anything was deleted.
if (m_database->hadDeletes())
m_database->incrementalVacuumIfNeeded();
// The commit was successful. If the transaction modified this database, notify the delegates.
if (m_modifiedDatabase)
m_transactionClient->didCommitWriteTransaction(database());
return 0;
}
void SQLTransactionBackendSync::rollback()
{
ASSERT(m_database->scriptExecutionContext()->isContextThread());
m_database->disableAuthorizer();
if (m_sqliteTransaction) {
m_sqliteTransaction->rollback();
m_sqliteTransaction.clear();
}
m_database->enableAuthorizer();
ASSERT(!m_database->sqliteDatabase().transactionInProgress());
}
} // namespace WebCore
#endif // ENABLE(SQL_DATABASE)
|
