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1 // Copyright (c) 2006-2010 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2006-2010 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/thread_restrictions.h" | |
27 #include "build/build_config.h" | 26 #include "build/build_config.h" |
28 #include "googleurl/src/gurl.h" | 27 #include "googleurl/src/gurl.h" |
29 #include "net/base/io_buffer.h" | 28 #include "net/base/io_buffer.h" |
30 #include "net/base/load_flags.h" | 29 #include "net/base/load_flags.h" |
31 #include "net/base/mime_util.h" | 30 #include "net/base/mime_util.h" |
32 #include "net/base/net_errors.h" | 31 #include "net/base/net_errors.h" |
33 #include "net/base/net_util.h" | 32 #include "net/base/net_util.h" |
34 #include "net/http/http_util.h" | 33 #include "net/http/http_util.h" |
35 #include "net/url_request/url_request.h" | 34 #include "net/url_request/url_request.h" |
36 #include "net/url_request/url_request_file_dir_job.h" | 35 #include "net/url_request/url_request_file_dir_job.h" |
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122 #if defined(OS_WIN) | 121 #if defined(OS_WIN) |
123 // Resolve UNC paths on a background thread. | 122 // Resolve UNC paths on a background thread. |
124 if (!file_path_.value().compare(0, 2, L"\\\\")) { | 123 if (!file_path_.value().compare(0, 2, L"\\\\")) { |
125 DCHECK(!async_resolver_); | 124 DCHECK(!async_resolver_); |
126 async_resolver_ = new AsyncResolver(this); | 125 async_resolver_ = new AsyncResolver(this); |
127 WorkerPool::PostTask(FROM_HERE, NewRunnableMethod( | 126 WorkerPool::PostTask(FROM_HERE, NewRunnableMethod( |
128 async_resolver_.get(), &AsyncResolver::Resolve, file_path_), true); | 127 async_resolver_.get(), &AsyncResolver::Resolve, file_path_), true); |
129 return; | 128 return; |
130 } | 129 } |
131 #endif | 130 #endif |
132 | |
133 // URL requests should not block on the disk! | |
134 // http://code.google.com/p/chromium/issues/detail?id=59849 | |
135 bool exists; | |
136 base::PlatformFileInfo file_info; | 131 base::PlatformFileInfo file_info; |
137 { | 132 bool exists = file_util::GetFileInfo(file_path_, &file_info); |
138 base::ThreadRestrictions::ScopedAllowIO allow_io; | |
139 exists = file_util::GetFileInfo(file_path_, &file_info); | |
140 } | |
141 | 133 |
142 // Continue asynchronously. | 134 // Continue asynchronously. |
143 MessageLoop::current()->PostTask(FROM_HERE, NewRunnableMethod( | 135 MessageLoop::current()->PostTask(FROM_HERE, NewRunnableMethod( |
144 this, &URLRequestFileJob::DidResolve, exists, file_info)); | 136 this, &URLRequestFileJob::DidResolve, exists, file_info)); |
145 } | 137 } |
146 | 138 |
147 void URLRequestFileJob::Kill() { | 139 void URLRequestFileJob::Kill() { |
148 stream_.Close(); | 140 stream_.Close(); |
149 | 141 |
150 #if defined(OS_WIN) | 142 #if defined(OS_WIN) |
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331 if (!resolved) | 323 if (!resolved) |
332 return false; | 324 return false; |
333 | 325 |
334 *location = net::FilePathToFileURL(new_path); | 326 *location = net::FilePathToFileURL(new_path); |
335 *http_status_code = 301; | 327 *http_status_code = 301; |
336 return true; | 328 return true; |
337 #else | 329 #else |
338 return false; | 330 return false; |
339 #endif | 331 #endif |
340 } | 332 } |
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