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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/upload_file_element_reader.h"
#include "base/bind.h"
#include "base/file_util.h"
#include "base/location.h"
#include "base/threading/thread_restrictions.h"
#include "base/threading/worker_pool.h"
#include "net/base/file_stream.h"
#include "net/base/net_errors.h"
namespace net {
namespace {
// In tests, this value is used to override the return value of
// UploadFileElementReader::GetContentLength() when set to non-zero.
uint64 overriding_content_length = 0;
// This method is used to implement Init().
void InitInternal(const FilePath& path,
uint64 range_offset,
uint64 range_length,
const base::Time& expected_modification_time,
scoped_ptr<FileStream>* out_file_stream,
uint64* out_content_length,
int* out_result) {
scoped_ptr<FileStream> file_stream(new FileStream(NULL));
int64 rv = file_stream->OpenSync(
path, base::PLATFORM_FILE_OPEN | base::PLATFORM_FILE_READ);
if (rv != OK) {
// If the file can't be opened, we'll just upload an empty file.
DLOG(WARNING) << "Failed to open \"" << path.value()
<< "\" for reading: " << rv;
file_stream.reset();
} else if (range_offset) {
rv = file_stream->SeekSync(FROM_BEGIN, range_offset);
if (rv < 0) {
DLOG(WARNING) << "Failed to seek \"" << path.value()
<< "\" to offset: " << range_offset << " (" << rv << ")";
file_stream->CloseSync();
file_stream.reset();
}
}
int64 length = 0;
if (file_stream.get() &&
file_util::GetFileSize(path, &length) &&
range_offset < static_cast<uint64>(length)) {
// Compensate for the offset.
length = std::min(length - range_offset, range_length);
}
*out_content_length = length;
out_file_stream->swap(file_stream);
// If the underlying file has been changed and the expected file modification
// time is set, treat it as error. Note that the expected modification time
// from WebKit is based on time_t precision. So we have to convert both to
// time_t to compare. This check is used for sliced files.
if (!expected_modification_time.is_null()) {
base::PlatformFileInfo info;
if (file_util::GetFileInfo(path, &info) &&
expected_modification_time.ToTimeT() != info.last_modified.ToTimeT()) {
*out_result = ERR_UPLOAD_FILE_CHANGED;
return;
}
}
*out_result = OK;
}
} // namespace
UploadFileElementReader::UploadFileElementReader(
const FilePath& path,
uint64 range_offset,
uint64 range_length,
const base::Time& expected_modification_time)
: path_(path),
range_offset_(range_offset),
range_length_(range_length),
expected_modification_time_(expected_modification_time),
content_length_(0),
bytes_remaining_(0),
weak_ptr_factory_(this) {
}
UploadFileElementReader::~UploadFileElementReader() {
// Temporarily allow until fix: http://crbug.com/72001.
base::ThreadRestrictions::ScopedAllowIO allow_io;
if (file_stream_.get())
file_stream_->CloseSync();
}
int UploadFileElementReader::Init(const CompletionCallback& callback) {
scoped_ptr<FileStream>* file_stream = new scoped_ptr<FileStream>;
uint64* content_length = new uint64;
int* result = new int;
const bool posted = base::WorkerPool::PostTaskAndReply(
FROM_HERE,
base::Bind(&InitInternal,
path_,
range_offset_,
range_length_,
expected_modification_time_,
file_stream,
content_length,
result),
base::Bind(&UploadFileElementReader::OnInitCompleted,
weak_ptr_factory_.GetWeakPtr(),
base::Owned(file_stream),
base::Owned(content_length),
base::Owned(result),
callback),
true /* task_is_slow */);
DCHECK(posted);
return ERR_IO_PENDING;
}
int UploadFileElementReader::InitSync() {
// Temporarily allow until fix: http://crbug.com/72001.
base::ThreadRestrictions::ScopedAllowIO allow_io;
scoped_ptr<FileStream> file_stream;
uint64 content_length = 0;
int result = OK;
InitInternal(path_, range_offset_, range_length_, expected_modification_time_,
&file_stream, &content_length, &result);
OnInitCompleted(&file_stream, &content_length, &result, CompletionCallback());
return result;
}
uint64 UploadFileElementReader::GetContentLength() const {
if (overriding_content_length)
return overriding_content_length;
return content_length_;
}
uint64 UploadFileElementReader::BytesRemaining() const {
return bytes_remaining_;
}
int UploadFileElementReader::ReadSync(char* buf, int buf_length) {
// Temporarily allow until fix: http://crbug.com/72001.
base::ThreadRestrictions::ScopedAllowIO allow_io;
DCHECK_LT(0, buf_length);
const uint64 num_bytes_to_read =
static_cast<int>(std::min(BytesRemaining(),
static_cast<uint64>(buf_length)));
if (num_bytes_to_read > 0) {
int num_bytes_consumed = 0;
// file_stream_ is NULL if the target file is
// missing or not readable.
if (file_stream_.get()) {
num_bytes_consumed =
file_stream_->ReadSync(buf, num_bytes_to_read);
}
if (num_bytes_consumed <= 0) {
// If there's less data to read than we initially observed, then
// pad with zero. Otherwise the server will hang waiting for the
// rest of the data.
memset(buf, 0, num_bytes_to_read);
}
}
DCHECK_GE(bytes_remaining_, num_bytes_to_read);
bytes_remaining_ -= num_bytes_to_read;
return num_bytes_to_read;
}
void UploadFileElementReader::OnInitCompleted(
scoped_ptr<FileStream>* file_stream,
uint64* content_length,
int* result,
const CompletionCallback& callback) {
file_stream_.swap(*file_stream);
content_length_ = *content_length;
bytes_remaining_ = GetContentLength();
if (!callback.is_null())
callback.Run(*result);
}
UploadFileElementReader::ScopedOverridingContentLengthForTests::
ScopedOverridingContentLengthForTests(uint64 value) {
overriding_content_length = value;
}
UploadFileElementReader::ScopedOverridingContentLengthForTests::
~ScopedOverridingContentLengthForTests() {
overriding_content_length = 0;
}
} // namespace net
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