android_webview/browser/net_disk_cache_remover.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "android_webview/browser/net_disk_cache_remover.h"
   6
   7 #include "base/bind_helpers.h"
   8 #include "content/public/browser/browser_context.h"
   9 #include "content/public/browser/browser_thread.h"
  10 #include "content/public/browser/web_contents.h"
  11 #include "net/disk_cache/disk_cache.h"
  12 #include "net/http/http_cache.h"
  13 #include "net/http/http_transaction_factory.h"
  14 #include "net/url_request/url_request_context_getter.h"
  15 #include "net/url_request/url_request_context.h"
  16 #include "net/base/completion_callback.h"
  17
  18 using content::BrowserThread;
  19 using disk_cache::Backend;
  20 using net::CompletionCallback;
  21 using net::URLRequestContextGetter;
  22
  23 namespace {
  24 // Everything is called and accessed on the IO thread.
  25
  26 void Noop(int rv) {
  27   DCHECK(rv == net::OK);
  28 }
  29
  30 void CallDoomAllEntries(Backend** backend, int rv) {
  31   DCHECK(rv == net::OK);
  32   (*backend)->DoomAllEntries(base::Bind(&Noop));
  33 }
  34
  35 void ClearHttpDiskCacheOfContext(URLRequestContextGetter* context_getter) {
  36   typedef Backend* BackendPtr;  // Make line below easier to understand.
  37   BackendPtr* backend_ptr = new BackendPtr(NULL);
  38   CompletionCallback callback(base::Bind(&CallDoomAllEntries,
  39                                          base::Owned(backend_ptr)));
  40
  41   int rv = context_getter->GetURLRequestContext()->
  42     http_transaction_factory()->GetCache()->GetBackend(backend_ptr, callback);
  43
  44   // If not net::ERR_IO_PENDING, then backend pointer is updated but callback
  45   // is not called, so call it explicitly.
  46   if (rv != net::ERR_IO_PENDING)
  47     callback.Run(net::OK);
  48 }
  49
  50 void ClearHttpDiskCacheOnIoThread(
  51     URLRequestContextGetter* main_context_getter,
  52     URLRequestContextGetter* media_context_getter) {
  53   ClearHttpDiskCacheOfContext(main_context_getter);
  54   ClearHttpDiskCacheOfContext(media_context_getter);
  55 }
  56
  57 }  // namespace
  58
  59 namespace android_webview {
  60
  61 void RemoveHttpDiskCache(content::BrowserContext* browser_context,
  62                         int renderer_child_id) {
  63   URLRequestContextGetter* main_context_getter =
  64       browser_context->GetRequestContextForRenderProcess(renderer_child_id);
  65   URLRequestContextGetter* media_context_getter =
  66       browser_context->GetMediaRequestContextForRenderProcess(
  67           renderer_child_id);
  68
  69   BrowserThread::PostTask(
  70       BrowserThread::IO, FROM_HERE,
  71       base::Bind(&ClearHttpDiskCacheOnIoThread,
  72                  base::Unretained(main_context_getter),
  73                  base::Unretained(media_context_getter)));
  74 }
  75
  76 }  // namespace android_webview