OLD | NEW |
1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // For loading files, we make use of overlapped i/o to ensure that reading from | 5 // For loading files, we make use of overlapped i/o to ensure that reading from |
6 // the filesystem (e.g., a network filesystem) does not block the calling | 6 // the filesystem (e.g., a network filesystem) does not block the calling |
7 // thread. An alternative approach would be to use a background thread or pool | 7 // thread. An alternative approach would be to use a background thread or pool |
8 // of threads, but it seems better to leverage the operating system's ability | 8 // of threads, but it seems better to leverage the operating system's ability |
9 // to do background file reads for us. | 9 // to do background file reads for us. |
10 // | 10 // |
11 // Since overlapped reads require a 'static' buffer for the duration of the | 11 // Since overlapped reads require a 'static' buffer for the duration of the |
12 // asynchronous read, the URLRequestFileJob keeps a buffer as a member var. In | 12 // asynchronous read, the URLRequestFileJob keeps a buffer as a member var. In |
13 // URLRequestFileJob::Read, data is simply copied from the object's buffer into | 13 // URLRequestFileJob::Read, data is simply copied from the object's buffer into |
14 // the given buffer. If there is no data to copy, the URLRequestFileJob | 14 // the given buffer. If there is no data to copy, the URLRequestFileJob |
15 // attempts to read more from the file to fill its buffer. If reading from the | 15 // attempts to read more from the file to fill its buffer. If reading from the |
16 // file does not complete synchronously, then the URLRequestFileJob waits for a | 16 // file does not complete synchronously, then the URLRequestFileJob waits for a |
17 // signal from the OS that the overlapped read has completed. It does so by | 17 // signal from the OS that the overlapped read has completed. It does so by |
18 // leveraging the MessageLoop::WatchObject API. | 18 // leveraging the MessageLoop::WatchObject API. |
19 | 19 |
20 #include "net/url_request/url_request_file_job.h" | 20 #include "net/url_request/url_request_file_job.h" |
21 | 21 |
22 #include "base/compiler_specific.h" | 22 #include "base/compiler_specific.h" |
23 #include "base/message_loop.h" | 23 #include "base/message_loop.h" |
24 #include "base/platform_file.h" | 24 #include "base/platform_file.h" |
25 #include "base/string_util.h" | 25 #include "base/string_util.h" |
| 26 #include "base/threading/worker_pool.h" |
26 #include "base/thread_restrictions.h" | 27 #include "base/thread_restrictions.h" |
27 #include "build/build_config.h" | 28 #include "build/build_config.h" |
28 #include "googleurl/src/gurl.h" | 29 #include "googleurl/src/gurl.h" |
29 #include "net/base/io_buffer.h" | 30 #include "net/base/io_buffer.h" |
30 #include "net/base/load_flags.h" | 31 #include "net/base/load_flags.h" |
31 #include "net/base/mime_util.h" | 32 #include "net/base/mime_util.h" |
32 #include "net/base/net_errors.h" | 33 #include "net/base/net_errors.h" |
33 #include "net/base/net_util.h" | 34 #include "net/base/net_util.h" |
34 #include "net/http/http_util.h" | 35 #include "net/http/http_util.h" |
35 #include "net/url_request/url_request.h" | 36 #include "net/url_request/url_request.h" |
36 #include "net/url_request/url_request_error_job.h" | 37 #include "net/url_request/url_request_error_job.h" |
37 #include "net/url_request/url_request_file_dir_job.h" | 38 #include "net/url_request/url_request_file_dir_job.h" |
38 | 39 |
39 #if defined(OS_WIN) | |
40 #include "base/worker_pool.h" | |
41 #endif | |
42 | |
43 namespace net { | 40 namespace net { |
44 | 41 |
45 #if defined(OS_WIN) | 42 #if defined(OS_WIN) |
46 class URLRequestFileJob::AsyncResolver | 43 class URLRequestFileJob::AsyncResolver |
47 : public base::RefCountedThreadSafe<URLRequestFileJob::AsyncResolver> { | 44 : public base::RefCountedThreadSafe<URLRequestFileJob::AsyncResolver> { |
48 public: | 45 public: |
49 explicit AsyncResolver(URLRequestFileJob* owner) | 46 explicit AsyncResolver(URLRequestFileJob* owner) |
50 : owner_(owner), owner_loop_(MessageLoop::current()) { | 47 : owner_(owner), owner_loop_(MessageLoop::current()) { |
51 } | 48 } |
52 | 49 |
(...skipping 76 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
129 DCHECK(!async_resolver_); | 126 DCHECK(!async_resolver_); |
130 #endif | 127 #endif |
131 } | 128 } |
132 | 129 |
133 void URLRequestFileJob::Start() { | 130 void URLRequestFileJob::Start() { |
134 #if defined(OS_WIN) | 131 #if defined(OS_WIN) |
135 // Resolve UNC paths on a background thread. | 132 // Resolve UNC paths on a background thread. |
136 if (!file_path_.value().compare(0, 2, L"\\\\")) { | 133 if (!file_path_.value().compare(0, 2, L"\\\\")) { |
137 DCHECK(!async_resolver_); | 134 DCHECK(!async_resolver_); |
138 async_resolver_ = new AsyncResolver(this); | 135 async_resolver_ = new AsyncResolver(this); |
139 WorkerPool::PostTask(FROM_HERE, NewRunnableMethod( | 136 base::WorkerPool::PostTask(FROM_HERE, NewRunnableMethod( |
140 async_resolver_.get(), &AsyncResolver::Resolve, file_path_), true); | 137 async_resolver_.get(), &AsyncResolver::Resolve, file_path_), true); |
141 return; | 138 return; |
142 } | 139 } |
143 #endif | 140 #endif |
144 | 141 |
145 // URL requests should not block on the disk! | 142 // URL requests should not block on the disk! |
146 // http://code.google.com/p/chromium/issues/detail?id=59849 | 143 // http://code.google.com/p/chromium/issues/detail?id=59849 |
147 bool exists; | 144 bool exists; |
148 base::PlatformFileInfo file_info; | 145 base::PlatformFileInfo file_info; |
149 { | 146 { |
(...skipping 234 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
384 if (white_listed_path == file_path.StripTrailingSeparators() || | 381 if (white_listed_path == file_path.StripTrailingSeparators() || |
385 white_listed_path.IsParent(file_path)) { | 382 white_listed_path.IsParent(file_path)) { |
386 return false; | 383 return false; |
387 } | 384 } |
388 } | 385 } |
389 return true; | 386 return true; |
390 } | 387 } |
391 #endif | 388 #endif |
392 | 389 |
393 } // namespace net | 390 } // namespace net |
OLD | NEW |