toolkit/components/places/nsFaviconService.cpp@129ffea94266
toolkit/components/places/nsFaviconService.cpp
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6 /**
7 * This is the favicon service, which stores favicons for web pages with your
8 * history as you browse. It is also used to save the favicons for bookmarks.
9 *
10 * DANGER: The history query system makes assumptions about the favicon storage
11 * so that icons can be quickly generated for history/bookmark result sets. If
12 * you change the database layout at all, you will have to update both services.
13 */
15 #include "nsFaviconService.h"
17 #include "nsNavHistory.h"
18 #include "nsPlacesMacros.h"
19 #include "Helpers.h"
20 #include "AsyncFaviconHelpers.h"
22 #include "nsNetUtil.h"
23 #include "nsReadableUtils.h"
24 #include "nsStreamUtils.h"
25 #include "nsStringStream.h"
26 #include "plbase64.h"
27 #include "nsIClassInfoImpl.h"
28 #include "mozilla/ArrayUtils.h"
29 #include "mozilla/Preferences.h"
31 // For large favicons optimization.
32 #include "imgITools.h"
33 #include "imgIContainer.h"
35 // Default value for mOptimizedIconDimension
36 #define OPTIMIZED_FAVICON_DIMENSION 16
38 #define MAX_FAVICON_CACHE_SIZE 256
39 #define FAVICON_CACHE_REDUCE_COUNT 64
41 #define MAX_UNASSOCIATED_FAVICONS 64
43 // When replaceFaviconData is called, we store the icons in an in-memory cache
44 // instead of in storage. Icons in the cache are expired according to this
45 // interval.
46 #define UNASSOCIATED_ICON_EXPIRY_INTERVAL 60000
48 // The MIME type of the default favicon and favicons created by
49 // OptimizeFaviconImage.
50 #define DEFAULT_MIME_TYPE "image/png"
52 using namespace mozilla;
53 using namespace mozilla::places;
55 /**
56 * Used to notify a topic to system observers on async execute completion.
57 * Will throw on error.
58 */
59 class ExpireFaviconsStatementCallbackNotifier : public AsyncStatementCallback
60 {
61 public:
62 ExpireFaviconsStatementCallbackNotifier();
63 NS_IMETHOD HandleCompletion(uint16_t aReason);
64 };
67 PLACES_FACTORY_SINGLETON_IMPLEMENTATION(nsFaviconService, gFaviconService)
69 NS_IMPL_CLASSINFO(nsFaviconService, nullptr, 0, NS_FAVICONSERVICE_CID)
70 NS_IMPL_ISUPPORTS_CI(
71 nsFaviconService
72 , nsIFaviconService
73 , mozIAsyncFavicons
74 , nsITimerCallback
75 )
77 nsFaviconService::nsFaviconService()
78 : mOptimizedIconDimension(OPTIMIZED_FAVICON_DIMENSION)
79 , mFailedFaviconSerial(0)
80 , mFailedFavicons(MAX_FAVICON_CACHE_SIZE)
81 , mUnassociatedIcons(MAX_UNASSOCIATED_FAVICONS)
82 {
83 NS_ASSERTION(!gFaviconService,
84 "Attempting to create two instances of the service!");
85 gFaviconService = this;
86 }
89 nsFaviconService::~nsFaviconService()
90 {
91 NS_ASSERTION(gFaviconService == this,
92 "Deleting a non-singleton instance of the service");
93 if (gFaviconService == this)
94 gFaviconService = nullptr;
95 }
98 nsresult
99 nsFaviconService::Init()
100 {
101 mDB = Database::GetDatabase();
102 NS_ENSURE_STATE(mDB);
104 mOptimizedIconDimension = Preferences::GetInt(
105 "places.favicons.optimizeToDimension", OPTIMIZED_FAVICON_DIMENSION
106 );
108 mExpireUnassociatedIconsTimer = do_CreateInstance("@mozilla.org/timer;1");
109 NS_ENSURE_STATE(mExpireUnassociatedIconsTimer);
111 return NS_OK;
112 }
114 NS_IMETHODIMP
115 nsFaviconService::ExpireAllFavicons()
116 {
117 nsCOMPtr<mozIStorageAsyncStatement> unlinkIconsStmt = mDB->GetAsyncStatement(
118 "UPDATE moz_places "
119 "SET favicon_id = NULL "
120 "WHERE favicon_id NOT NULL"
121 );
122 NS_ENSURE_STATE(unlinkIconsStmt);
123 nsCOMPtr<mozIStorageAsyncStatement> removeIconsStmt = mDB->GetAsyncStatement(
124 "DELETE FROM moz_favicons WHERE id NOT IN ("
125 "SELECT favicon_id FROM moz_places WHERE favicon_id NOT NULL "
126 ")"
127 );
128 NS_ENSURE_STATE(removeIconsStmt);
130 mozIStorageBaseStatement* stmts[] = {
131 unlinkIconsStmt.get()
132 , removeIconsStmt.get()
133 };
134 nsCOMPtr<mozIStoragePendingStatement> ps;
135 nsRefPtr<ExpireFaviconsStatementCallbackNotifier> callback =
136 new ExpireFaviconsStatementCallbackNotifier();
137 nsresult rv = mDB->MainConn()->ExecuteAsync(
138 stmts, ArrayLength(stmts), callback, getter_AddRefs(ps)
139 );
140 NS_ENSURE_SUCCESS(rv, rv);
142 return NS_OK;
143 }
145 ////////////////////////////////////////////////////////////////////////////////
146 //// nsITimerCallback
148 static PLDHashOperator
149 ExpireNonrecentUnassociatedIconsEnumerator(
150 UnassociatedIconHashKey* aIconKey,
151 void* aNow)
152 {
153 PRTime now = *(reinterpret_cast<PRTime*>(aNow));
154 if (now - aIconKey->created >= UNASSOCIATED_ICON_EXPIRY_INTERVAL) {
155 return PL_DHASH_REMOVE;
156 }
157 return PL_DHASH_NEXT;
158 }
160 NS_IMETHODIMP
161 nsFaviconService::Notify(nsITimer* timer)
162 {
163 if (timer != mExpireUnassociatedIconsTimer.get()) {
164 return NS_ERROR_INVALID_ARG;
165 }
167 PRTime now = PR_Now();
168 mUnassociatedIcons.EnumerateEntries(
169 ExpireNonrecentUnassociatedIconsEnumerator, &now);
170 // Re-init the expiry timer if the cache isn't empty.
171 if (mUnassociatedIcons.Count() > 0) {
172 mExpireUnassociatedIconsTimer->InitWithCallback(
173 this, UNASSOCIATED_ICON_EXPIRY_INTERVAL, nsITimer::TYPE_ONE_SHOT);
174 }
176 return NS_OK;
177 }
179 ////////////////////////////////////////////////////////////////////////////////
180 //// nsIFaviconService
182 NS_IMETHODIMP
183 nsFaviconService::GetDefaultFavicon(nsIURI** _retval)
184 {
185 NS_ENSURE_ARG_POINTER(_retval);
187 // not found, use default
188 if (!mDefaultIcon) {
189 nsresult rv = NS_NewURI(getter_AddRefs(mDefaultIcon),
190 NS_LITERAL_CSTRING(FAVICON_DEFAULT_URL));
191 NS_ENSURE_SUCCESS(rv, rv);
192 }
193 return mDefaultIcon->Clone(_retval);
194 }
196 void
197 nsFaviconService::SendFaviconNotifications(nsIURI* aPageURI,
198 nsIURI* aFaviconURI,
199 const nsACString& aGUID)
200 {
201 nsAutoCString faviconSpec;
202 nsNavHistory* history = nsNavHistory::GetHistoryService();
203 if (history && NS_SUCCEEDED(aFaviconURI->GetSpec(faviconSpec))) {
204 history->SendPageChangedNotification(aPageURI,
205 nsINavHistoryObserver::ATTRIBUTE_FAVICON,
206 NS_ConvertUTF8toUTF16(faviconSpec),
207 aGUID);
208 }
209 }
211 NS_IMETHODIMP
212 nsFaviconService::SetAndFetchFaviconForPage(nsIURI* aPageURI,
213 nsIURI* aFaviconURI,
214 bool aForceReload,
215 uint32_t aFaviconLoadType,
216 nsIFaviconDataCallback* aCallback)
217 {
218 NS_ENSURE_ARG(aPageURI);
219 NS_ENSURE_ARG(aFaviconURI);
221 // If a favicon is in the failed cache, only load it during a forced reload.
222 bool previouslyFailed;
223 nsresult rv = IsFailedFavicon(aFaviconURI, &previouslyFailed);
224 NS_ENSURE_SUCCESS(rv, rv);
225 if (previouslyFailed) {
226 if (aForceReload)
227 RemoveFailedFavicon(aFaviconURI);
228 else
229 return NS_OK;
230 }
232 // Check if the icon already exists and fetch it from the network, if needed.
233 // Finally associate the icon to the requested page if not yet associated.
234 rv = AsyncFetchAndSetIconForPage::start(
235 aFaviconURI, aPageURI, aForceReload ? FETCH_ALWAYS : FETCH_IF_MISSING,
236 aFaviconLoadType, aCallback
237 );
238 NS_ENSURE_SUCCESS(rv, rv);
240 // DB will be updated and observers notified when data has finished loading.
241 return NS_OK;
242 }
244 NS_IMETHODIMP
245 nsFaviconService::ReplaceFaviconData(nsIURI* aFaviconURI,
246 const uint8_t* aData,
247 uint32_t aDataLen,
248 const nsACString& aMimeType,
249 PRTime aExpiration)
250 {
251 NS_ENSURE_ARG(aFaviconURI);
252 NS_ENSURE_ARG(aData);
253 NS_ENSURE_TRUE(aDataLen > 0, NS_ERROR_INVALID_ARG);
254 NS_ENSURE_TRUE(aMimeType.Length() > 0, NS_ERROR_INVALID_ARG);
255 if (aExpiration == 0) {
256 aExpiration = PR_Now() + MAX_FAVICON_EXPIRATION;
257 }
259 UnassociatedIconHashKey* iconKey = mUnassociatedIcons.PutEntry(aFaviconURI);
260 if (!iconKey) {
261 return NS_ERROR_OUT_OF_MEMORY;
262 }
264 iconKey->created = PR_Now();
266 // If the cache contains unassociated icons, an expiry timer should already exist, otherwise
267 // there may be a timer left hanging around, so make sure we fire a new one.
268 int32_t unassociatedCount = mUnassociatedIcons.Count();
269 if (unassociatedCount == 1) {
270 mExpireUnassociatedIconsTimer->Cancel();
271 mExpireUnassociatedIconsTimer->InitWithCallback(
272 this, UNASSOCIATED_ICON_EXPIRY_INTERVAL, nsITimer::TYPE_ONE_SHOT);
273 }
275 IconData* iconData = &(iconKey->iconData);
276 iconData->expiration = aExpiration;
277 iconData->status = ICON_STATUS_CACHED;
278 iconData->fetchMode = FETCH_NEVER;
279 nsresult rv = aFaviconURI->GetSpec(iconData->spec);
280 NS_ENSURE_SUCCESS(rv, rv);
282 // If the page provided a large image for the favicon (eg, a highres image
283 // or a multiresolution .ico file), we don't want to store more data than
284 // needed.
285 if (aDataLen > MAX_ICON_FILESIZE(mOptimizedIconDimension)) {
286 rv = OptimizeFaviconImage(aData, aDataLen, aMimeType, iconData->data, iconData->mimeType);
287 NS_ENSURE_SUCCESS(rv, rv);
289 if (iconData->data.Length() > MAX_FAVICON_SIZE) {
290 // We cannot optimize this favicon size and we are over the maximum size
291 // allowed, so we will not save data to the db to avoid bloating it.
292 mUnassociatedIcons.RemoveEntry(aFaviconURI);
293 return NS_ERROR_FAILURE;
294 }
295 } else {
296 iconData->mimeType.Assign(aMimeType);
297 iconData->data.Assign(TO_CHARBUFFER(aData), aDataLen);
298 }
300 // If the database contains an icon at the given url, we will update the
301 // database immediately so that the associated pages are kept in sync.
302 // Otherwise, do nothing and let the icon be picked up from the memory hash.
303 rv = AsyncReplaceFaviconData::start(iconData);
304 NS_ENSURE_SUCCESS(rv, rv);
306 return NS_OK;
307 }
309 NS_IMETHODIMP
310 nsFaviconService::ReplaceFaviconDataFromDataURL(nsIURI* aFaviconURI,
311 const nsAString& aDataURL,
312 PRTime aExpiration)
313 {
314 NS_ENSURE_ARG(aFaviconURI);
315 NS_ENSURE_TRUE(aDataURL.Length() > 0, NS_ERROR_INVALID_ARG);
316 if (aExpiration == 0) {
317 aExpiration = PR_Now() + MAX_FAVICON_EXPIRATION;
318 }
320 nsCOMPtr<nsIURI> dataURI;
321 nsresult rv = NS_NewURI(getter_AddRefs(dataURI), aDataURL);
322 NS_ENSURE_SUCCESS(rv, rv);
324 // Use the data: protocol handler to convert the data.
325 nsCOMPtr<nsIIOService> ioService = do_GetIOService(&rv);
326 NS_ENSURE_SUCCESS(rv, rv);
327 nsCOMPtr<nsIProtocolHandler> protocolHandler;
328 rv = ioService->GetProtocolHandler("data", getter_AddRefs(protocolHandler));
329 NS_ENSURE_SUCCESS(rv, rv);
331 nsCOMPtr<nsIChannel> channel;
332 rv = protocolHandler->NewChannel(dataURI, getter_AddRefs(channel));
333 NS_ENSURE_SUCCESS(rv, rv);
335 // Blocking stream is OK for data URIs.
336 nsCOMPtr<nsIInputStream> stream;
337 rv = channel->Open(getter_AddRefs(stream));
338 NS_ENSURE_SUCCESS(rv, rv);
340 uint64_t available64;
341 rv = stream->Available(&available64);
342 NS_ENSURE_SUCCESS(rv, rv);
343 if (available64 == 0 || available64 > UINT32_MAX / sizeof(uint8_t))
344 return NS_ERROR_FILE_TOO_BIG;
345 uint32_t available = (uint32_t)available64;
347 // Read all the decoded data.
348 uint8_t* buffer = static_cast<uint8_t*>
349 (nsMemory::Alloc(sizeof(uint8_t) * available));
350 if (!buffer)
351 return NS_ERROR_OUT_OF_MEMORY;
352 uint32_t numRead;
353 rv = stream->Read(TO_CHARBUFFER(buffer), available, &numRead);
354 if (NS_FAILED(rv) || numRead != available) {
355 nsMemory::Free(buffer);
356 return rv;
357 }
359 nsAutoCString mimeType;
360 rv = channel->GetContentType(mimeType);
361 if (NS_FAILED(rv)) {
362 nsMemory::Free(buffer);
363 return rv;
364 }
366 // ReplaceFaviconData can now do the dirty work.
367 rv = ReplaceFaviconData(aFaviconURI, buffer, available, mimeType, aExpiration);
368 nsMemory::Free(buffer);
369 NS_ENSURE_SUCCESS(rv, rv);
371 return NS_OK;
372 }
374 NS_IMETHODIMP
375 nsFaviconService::GetFaviconURLForPage(nsIURI *aPageURI,
376 nsIFaviconDataCallback* aCallback)
377 {
378 NS_ENSURE_ARG(aPageURI);
379 NS_ENSURE_ARG(aCallback);
381 nsresult rv = AsyncGetFaviconURLForPage::start(aPageURI, aCallback);
382 NS_ENSURE_SUCCESS(rv, rv);
383 return NS_OK;
384 }
386 NS_IMETHODIMP
387 nsFaviconService::GetFaviconDataForPage(nsIURI* aPageURI,
388 nsIFaviconDataCallback* aCallback)
389 {
390 NS_ENSURE_ARG(aPageURI);
391 NS_ENSURE_ARG(aCallback);
393 nsresult rv = AsyncGetFaviconDataForPage::start(aPageURI, aCallback);
394 NS_ENSURE_SUCCESS(rv, rv);
395 return NS_OK;
396 }
398 nsresult
399 nsFaviconService::GetFaviconLinkForIcon(nsIURI* aFaviconURI,
400 nsIURI** aOutputURI)
401 {
402 NS_ENSURE_ARG(aFaviconURI);
403 NS_ENSURE_ARG_POINTER(aOutputURI);
405 nsAutoCString spec;
406 if (aFaviconURI) {
407 nsresult rv = aFaviconURI->GetSpec(spec);
408 NS_ENSURE_SUCCESS(rv, rv);
409 }
410 return GetFaviconLinkForIconString(spec, aOutputURI);
411 }
414 static PLDHashOperator
415 ExpireFailedFaviconsCallback(nsCStringHashKey::KeyType aKey,
416 uint32_t& aData,
417 void* userArg)
418 {
419 uint32_t* threshold = reinterpret_cast<uint32_t*>(userArg);
420 if (aData < *threshold)
421 return PL_DHASH_REMOVE;
422 return PL_DHASH_NEXT;
423 }
426 NS_IMETHODIMP
427 nsFaviconService::AddFailedFavicon(nsIURI* aFaviconURI)
428 {
429 NS_ENSURE_ARG(aFaviconURI);
431 nsAutoCString spec;
432 nsresult rv = aFaviconURI->GetSpec(spec);
433 NS_ENSURE_SUCCESS(rv, rv);
435 mFailedFavicons.Put(spec, mFailedFaviconSerial);
436 mFailedFaviconSerial ++;
438 if (mFailedFavicons.Count() > MAX_FAVICON_CACHE_SIZE) {
439 // need to expire some entries, delete the FAVICON_CACHE_REDUCE_COUNT number
440 // of items that are the oldest
441 uint32_t threshold = mFailedFaviconSerial -
442 MAX_FAVICON_CACHE_SIZE + FAVICON_CACHE_REDUCE_COUNT;
443 mFailedFavicons.Enumerate(ExpireFailedFaviconsCallback, &threshold);
444 }
445 return NS_OK;
446 }
449 NS_IMETHODIMP
450 nsFaviconService::RemoveFailedFavicon(nsIURI* aFaviconURI)
451 {
452 NS_ENSURE_ARG(aFaviconURI);
454 nsAutoCString spec;
455 nsresult rv = aFaviconURI->GetSpec(spec);
456 NS_ENSURE_SUCCESS(rv, rv);
458 // we silently do nothing and succeed if the icon is not in the cache
459 mFailedFavicons.Remove(spec);
460 return NS_OK;
461 }
464 NS_IMETHODIMP
465 nsFaviconService::IsFailedFavicon(nsIURI* aFaviconURI, bool* _retval)
466 {
467 NS_ENSURE_ARG(aFaviconURI);
468 nsAutoCString spec;
469 nsresult rv = aFaviconURI->GetSpec(spec);
470 NS_ENSURE_SUCCESS(rv, rv);
472 uint32_t serial;
473 *_retval = mFailedFavicons.Get(spec, &serial);
474 return NS_OK;
475 }
478 // nsFaviconService::GetFaviconLinkForIconString
479 //
480 // This computes a favicon URL with string input and using the cached
481 // default one to minimize parsing.
483 nsresult
484 nsFaviconService::GetFaviconLinkForIconString(const nsCString& aSpec,
485 nsIURI** aOutput)
486 {
487 if (aSpec.IsEmpty()) {
488 // default icon for empty strings
489 if (! mDefaultIcon) {
490 nsresult rv = NS_NewURI(getter_AddRefs(mDefaultIcon),
491 NS_LITERAL_CSTRING(FAVICON_DEFAULT_URL));
492 NS_ENSURE_SUCCESS(rv, rv);
493 }
494 return mDefaultIcon->Clone(aOutput);
495 }
497 if (StringBeginsWith(aSpec, NS_LITERAL_CSTRING("chrome:"))) {
498 // pass through for chrome URLs, since they can be referenced without
499 // this service
500 return NS_NewURI(aOutput, aSpec);
501 }
503 nsAutoCString annoUri;
504 annoUri.AssignLiteral("moz-anno:" FAVICON_ANNOTATION_NAME ":");
505 annoUri += aSpec;
506 return NS_NewURI(aOutput, annoUri);
507 }
510 // nsFaviconService::GetFaviconSpecForIconString
511 //
512 // This computes a favicon spec for when you don't want a URI object (as in
513 // the tree view implementation), sparing all parsing and normalization.
514 void
515 nsFaviconService::GetFaviconSpecForIconString(const nsCString& aSpec,
516 nsACString& aOutput)
517 {
518 if (aSpec.IsEmpty()) {
519 aOutput.AssignLiteral(FAVICON_DEFAULT_URL);
520 } else if (StringBeginsWith(aSpec, NS_LITERAL_CSTRING("chrome:"))) {
521 aOutput = aSpec;
522 } else {
523 aOutput.AssignLiteral("moz-anno:" FAVICON_ANNOTATION_NAME ":");
524 aOutput += aSpec;
525 }
526 }
529 // nsFaviconService::OptimizeFaviconImage
530 //
531 // Given a blob of data (a image file already read into a buffer), optimize
532 // its size by recompressing it as a 16x16 PNG.
533 nsresult
534 nsFaviconService::OptimizeFaviconImage(const uint8_t* aData, uint32_t aDataLen,
535 const nsACString& aMimeType,
536 nsACString& aNewData,
537 nsACString& aNewMimeType)
538 {
539 nsresult rv;
541 nsCOMPtr<imgITools> imgtool = do_CreateInstance("@mozilla.org/image/tools;1");
543 nsCOMPtr<nsIInputStream> stream;
544 rv = NS_NewByteInputStream(getter_AddRefs(stream),
545 reinterpret_cast<const char*>(aData), aDataLen,
546 NS_ASSIGNMENT_DEPEND);
547 NS_ENSURE_SUCCESS(rv, rv);
549 // decode image
550 nsCOMPtr<imgIContainer> container;
551 rv = imgtool->DecodeImageData(stream, aMimeType, getter_AddRefs(container));
552 NS_ENSURE_SUCCESS(rv, rv);
554 aNewMimeType.AssignLiteral(DEFAULT_MIME_TYPE);
556 // scale and recompress
557 nsCOMPtr<nsIInputStream> iconStream;
558 rv = imgtool->EncodeScaledImage(container, aNewMimeType,
559 mOptimizedIconDimension,
560 mOptimizedIconDimension,
561 EmptyString(),
562 getter_AddRefs(iconStream));
563 NS_ENSURE_SUCCESS(rv, rv);
565 // Read the stream into a new buffer.
566 rv = NS_ConsumeStream(iconStream, UINT32_MAX, aNewData);
567 NS_ENSURE_SUCCESS(rv, rv);
569 return NS_OK;
570 }
572 nsresult
573 nsFaviconService::GetFaviconDataAsync(nsIURI* aFaviconURI,
574 mozIStorageStatementCallback *aCallback)
575 {
576 NS_ASSERTION(aCallback, "Doesn't make sense to call this without a callback");
577 nsCOMPtr<mozIStorageAsyncStatement> stmt = mDB->GetAsyncStatement(
578 "SELECT f.data, f.mime_type FROM moz_favicons f WHERE url = :icon_url"
579 );
580 NS_ENSURE_STATE(stmt);
582 nsresult rv = URIBinder::Bind(stmt, NS_LITERAL_CSTRING("icon_url"), aFaviconURI);
583 NS_ENSURE_SUCCESS(rv, rv);
585 nsCOMPtr<mozIStoragePendingStatement> pendingStatement;
586 return stmt->ExecuteAsync(aCallback, getter_AddRefs(pendingStatement));
587 }
589 ////////////////////////////////////////////////////////////////////////////////
590 //// ExpireFaviconsStatementCallbackNotifier
592 ExpireFaviconsStatementCallbackNotifier::ExpireFaviconsStatementCallbackNotifier()
593 {
594 }
597 NS_IMETHODIMP
598 ExpireFaviconsStatementCallbackNotifier::HandleCompletion(uint16_t aReason)
599 {
600 // We should dispatch only if expiration has been successful.
601 if (aReason != mozIStorageStatementCallback::REASON_FINISHED)
602 return NS_OK;
604 nsCOMPtr<nsIObserverService> observerService =
605 mozilla::services::GetObserverService();
606 if (observerService) {
607 (void)observerService->NotifyObservers(nullptr,
608 NS_PLACES_FAVICONS_EXPIRED_TOPIC_ID,
609 nullptr);
610 }
612 return NS_OK;
613 }
