summaryrefslogtreecommitdiffstats
path: root/storage/mozStorageAsyncStatement.cpp
blob: b9332f043b367d9cd12926f4b4cbb061600f9c3c (plain)
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
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include <limits.h>
#include <stdio.h>

#include "nsError.h"
#include "nsProxyRelease.h"
#include "nsThreadUtils.h"
#include "nsIClassInfoImpl.h"
#include "Variant.h"

#include "mozStorageBindingParams.h"
#include "mozStorageConnection.h"
#include "mozStorageAsyncStatementJSHelper.h"
#include "mozStorageAsyncStatementParams.h"
#include "mozStoragePrivateHelpers.h"
#include "mozStorageStatementRow.h"
#include "mozStorageStatement.h"

#include "mozilla/Logging.h"

extern mozilla::LazyLogModule gStorageLog;

namespace mozilla {
namespace storage {

////////////////////////////////////////////////////////////////////////////////
//// nsIClassInfo

NS_IMPL_CI_INTERFACE_GETTER(AsyncStatement, mozIStorageAsyncStatement,
                            mozIStorageBaseStatement, mozIStorageBindingParams,
                            mozilla::storage::StorageBaseStatementInternal)

class AsyncStatementClassInfo : public nsIClassInfo {
 public:
  constexpr AsyncStatementClassInfo() = default;

  NS_DECL_ISUPPORTS_INHERITED

  NS_IMETHOD
  GetInterfaces(nsTArray<nsIID>& _array) override {
    return NS_CI_INTERFACE_GETTER_NAME(AsyncStatement)(_array);
  }

  NS_IMETHOD
  GetScriptableHelper(nsIXPCScriptable** _helper) override {
    static AsyncStatementJSHelper sJSHelper;
    *_helper = &sJSHelper;
    return NS_OK;
  }

  NS_IMETHOD
  GetContractID(nsACString& aContractID) override {
    aContractID.SetIsVoid(true);
    return NS_OK;
  }

  NS_IMETHOD
  GetClassDescription(nsACString& aDesc) override {
    aDesc.SetIsVoid(true);
    return NS_OK;
  }

  NS_IMETHOD
  GetClassID(nsCID** _id) override {
    *_id = nullptr;
    return NS_OK;
  }

  NS_IMETHOD
  GetFlags(uint32_t* _flags) override {
    *_flags = 0;
    return NS_OK;
  }

  NS_IMETHOD
  GetClassIDNoAlloc(nsCID* _cid) override { return NS_ERROR_NOT_AVAILABLE; }
};

NS_IMETHODIMP_(MozExternalRefCountType) AsyncStatementClassInfo::AddRef() {
  return 2;
}
NS_IMETHODIMP_(MozExternalRefCountType) AsyncStatementClassInfo::Release() {
  return 1;
}
NS_IMPL_QUERY_INTERFACE(AsyncStatementClassInfo, nsIClassInfo)

static AsyncStatementClassInfo sAsyncStatementClassInfo;

////////////////////////////////////////////////////////////////////////////////
//// AsyncStatement

AsyncStatement::AsyncStatement() : mFinalized(false) {}

nsresult AsyncStatement::initialize(Connection* aDBConnection,
                                    sqlite3* aNativeConnection,
                                    const nsACString& aSQLStatement) {
  MOZ_ASSERT(aDBConnection, "No database connection given!");
  MOZ_ASSERT(aDBConnection->isConnectionReadyOnThisThread(),
             "Database connection should be valid");
  MOZ_ASSERT(aNativeConnection, "No native connection given!");

  mDBConnection = aDBConnection;
  mNativeConnection = aNativeConnection;
  mSQLString = aSQLStatement;

  MOZ_LOG(gStorageLog, LogLevel::Debug,
          ("Inited async statement '%s' (0x%p)", mSQLString.get(), this));

#ifdef DEBUG
  // We want to try and test for LIKE and that consumers are using
  // escapeStringForLIKE instead of just trusting user input.  The idea to
  // check to see if they are binding a parameter after like instead of just
  // using a string.  We only do this in debug builds because it's expensive!
  auto c = nsCaseInsensitiveCStringComparator;
  nsACString::const_iterator start, end, e;
  aSQLStatement.BeginReading(start);
  aSQLStatement.EndReading(end);
  e = end;
  while (::FindInReadable(" LIKE"_ns, start, e, c)) {
    // We have a LIKE in here, so we perform our tests
    // FindInReadable moves the iterator, so we have to get a new one for
    // each test we perform.
    nsACString::const_iterator s1, s2, s3;
    s1 = s2 = s3 = start;

    if (!(::FindInReadable(" LIKE ?"_ns, s1, end, c) ||
          ::FindInReadable(" LIKE :"_ns, s2, end, c) ||
          ::FindInReadable(" LIKE @"_ns, s3, end, c))) {
      // At this point, we didn't find a LIKE statement followed by ?, :,
      // or @, all of which are valid characters for binding a parameter.
      // We will warn the consumer that they may not be safely using LIKE.
      NS_WARNING(
          "Unsafe use of LIKE detected!  Please ensure that you "
          "are using mozIStorageAsyncStatement::escapeStringForLIKE "
          "and that you are binding that result to the statement "
          "to prevent SQL injection attacks.");
    }

    // resetting start and e
    start = e;
    e = end;
  }
#endif

  return NS_OK;
}

mozIStorageBindingParams* AsyncStatement::getParams() {
  nsresult rv;

  // If we do not have an array object yet, make it.
  if (!mParamsArray) {
    nsCOMPtr<mozIStorageBindingParamsArray> array;
    rv = NewBindingParamsArray(getter_AddRefs(array));
    NS_ENSURE_SUCCESS(rv, nullptr);

    mParamsArray = static_cast<BindingParamsArray*>(array.get());
  }

  // If there isn't already any rows added, we'll have to add one to use.
  if (mParamsArray->length() == 0) {
    RefPtr<AsyncBindingParams> params(new AsyncBindingParams(mParamsArray));
    NS_ENSURE_TRUE(params, nullptr);

    rv = mParamsArray->AddParams(params);
    NS_ENSURE_SUCCESS(rv, nullptr);

    // We have to unlock our params because AddParams locks them.  This is safe
    // because no reference to the params object was, or ever will be given out.
    params->unlock(nullptr);

    // We also want to lock our array at this point - we don't want anything to
    // be added to it.
    mParamsArray->lock();
  }

  return *mParamsArray->begin();
}

/**
 * If we are here then we know there are no pending async executions relying on
 * us (StatementData holds a reference to us; this also goes for our own
 * AsyncStatementFinalizer which proxies its release to the calling event
 * target) and so it is always safe to destroy our sqlite3_stmt if one exists.
 * We can be destroyed on the caller event target by
 * garbage-collection/reference counting or on the async event target by the
 * last execution of a statement that already lost its main-thread refs.
 */
AsyncStatement::~AsyncStatement() {
  destructorAsyncFinalize();

  // If we are getting destroyed on the wrong event target, proxy the connection
  // release to the right one.
  if (!IsOnCurrentSerialEventTarget(mDBConnection->eventTargetOpenedOn)) {
    // NS_ProxyRelase only magic forgets for us if mDBConnection is an
    // nsCOMPtr.  Which it is not; it's a RefPtr.
    nsCOMPtr<nsIEventTarget> target(mDBConnection->eventTargetOpenedOn);
    NS_ProxyRelease("AsyncStatement::mDBConnection", target,
                    mDBConnection.forget());
  }
}

////////////////////////////////////////////////////////////////////////////////
//// nsISupports

NS_IMPL_ADDREF(AsyncStatement)
NS_IMPL_RELEASE(AsyncStatement)

NS_INTERFACE_MAP_BEGIN(AsyncStatement)
  NS_INTERFACE_MAP_ENTRY(mozIStorageAsyncStatement)
  NS_INTERFACE_MAP_ENTRY(mozIStorageBaseStatement)
  NS_INTERFACE_MAP_ENTRY(mozIStorageBindingParams)
  NS_INTERFACE_MAP_ENTRY(mozilla::storage::StorageBaseStatementInternal)
  if (aIID.Equals(NS_GET_IID(nsIClassInfo))) {
    foundInterface = static_cast<nsIClassInfo*>(&sAsyncStatementClassInfo);
  } else
    NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, mozIStorageAsyncStatement)
NS_INTERFACE_MAP_END

////////////////////////////////////////////////////////////////////////////////
//// StorageBaseStatementInternal

Connection* AsyncStatement::getOwner() { return mDBConnection; }

int AsyncStatement::getAsyncStatement(sqlite3_stmt** _stmt) {
#ifdef DEBUG
  // Make sure we are never called on the connection's owning event target.
  NS_ASSERTION(
      !IsOnCurrentSerialEventTarget(mDBConnection->eventTargetOpenedOn),
      "We should only be called on the async event target!");
#endif

  if (!mAsyncStatement) {
    int rc = mDBConnection->prepareStatement(mNativeConnection, mSQLString,
                                             &mAsyncStatement);
    if (rc != SQLITE_OK) {
      MOZ_LOG(gStorageLog, LogLevel::Error,
              ("Sqlite statement prepare error: %d '%s'", rc,
               ::sqlite3_errmsg(mNativeConnection)));
      MOZ_LOG(gStorageLog, LogLevel::Error,
              ("Statement was: '%s'", mSQLString.get()));
      *_stmt = nullptr;
      return rc;
    }
    MOZ_LOG(gStorageLog, LogLevel::Debug,
            ("Initialized statement '%s' (0x%p)", mSQLString.get(),
             mAsyncStatement));
  }

  *_stmt = mAsyncStatement;
  return SQLITE_OK;
}

nsresult AsyncStatement::getAsynchronousStatementData(StatementData& _data) {
  if (mFinalized) return NS_ERROR_UNEXPECTED;

  // Pass null for the sqlite3_stmt; it will be requested on demand from the
  // async event target.
  _data = StatementData(nullptr, bindingParamsArray(), this);

  return NS_OK;
}

already_AddRefed<mozIStorageBindingParams> AsyncStatement::newBindingParams(
    mozIStorageBindingParamsArray* aOwner) {
  if (mFinalized) return nullptr;

  nsCOMPtr<mozIStorageBindingParams> params(new AsyncBindingParams(aOwner));
  return params.forget();
}

////////////////////////////////////////////////////////////////////////////////
//// mozIStorageAsyncStatement

// (nothing is specific to mozIStorageAsyncStatement)

////////////////////////////////////////////////////////////////////////////////
//// StorageBaseStatementInternal

// proxy to StorageBaseStatementInternal using its define helper.
MIXIN_IMPL_STORAGEBASESTATEMENTINTERNAL(
    AsyncStatement, if (mFinalized) return NS_ERROR_UNEXPECTED;)

NS_IMETHODIMP
AsyncStatement::Finalize() {
  if (mFinalized) return NS_OK;

  mFinalized = true;

  MOZ_LOG(gStorageLog, LogLevel::Debug,
          ("Finalizing statement '%s'", mSQLString.get()));

  asyncFinalize();

  // Release the params holder, so it can release the reference to us.
  mStatementParamsHolder = nullptr;

  return NS_OK;
}

NS_IMETHODIMP
AsyncStatement::BindParameters(mozIStorageBindingParamsArray* aParameters) {
  if (mFinalized) return NS_ERROR_UNEXPECTED;

  BindingParamsArray* array = static_cast<BindingParamsArray*>(aParameters);
  if (array->getOwner() != this) return NS_ERROR_UNEXPECTED;

  if (array->length() == 0) return NS_ERROR_UNEXPECTED;

  mParamsArray = array;
  mParamsArray->lock();

  return NS_OK;
}

NS_IMETHODIMP
AsyncStatement::GetState(int32_t* _state) {
  if (mFinalized)
    *_state = MOZ_STORAGE_STATEMENT_INVALID;
  else
    *_state = MOZ_STORAGE_STATEMENT_READY;

  return NS_OK;
}

////////////////////////////////////////////////////////////////////////////////
//// mozIStorageBindingParams

BOILERPLATE_BIND_PROXIES(AsyncStatement,
                         if (mFinalized) return NS_ERROR_UNEXPECTED;)

}  // namespace storage
}  // namespace mozilla