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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 "webkit/fileapi/sandbox_file_stream_writer.h"
#include "base/files/file_util_proxy.h"
#include "base/platform_file.h"
#include "base/sequenced_task_runner.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "webkit/blob/local_file_stream_reader.h"
#include "webkit/fileapi/file_observers.h"
#include "webkit/fileapi/file_system_context.h"
#include "webkit/fileapi/file_system_operation.h"
#include "webkit/fileapi/file_system_util.h"
#include "webkit/fileapi/local_file_stream_writer.h"
#include "webkit/quota/quota_manager.h"
namespace fileapi {
namespace {
// Adjust the |quota| value in overwriting case (i.e. |file_size| > 0 and
// |file_offset| < |file_size|) to make the remaining quota calculation easier.
// Specifically this widens the quota for overlapping range (so that we can
// simply compare written bytes against the adjusted quota).
int64 AdjustQuotaForOverlap(int64 quota,
int64 file_offset,
int64 file_size) {
DCHECK_LE(file_offset, file_size);
if (quota < 0)
quota = 0;
int64 overlap = file_size - file_offset;
if (kint64max - overlap > quota)
quota += overlap;
return quota;
}
} // namespace
SandboxFileStreamWriter::SandboxFileStreamWriter(
FileSystemContext* file_system_context,
const FileSystemURL& url,
int64 initial_offset,
const UpdateObserverList& observers)
: file_system_context_(file_system_context),
url_(url),
initial_offset_(initial_offset),
observers_(observers),
file_size_(0),
total_bytes_written_(0),
allowed_bytes_to_write_(0),
has_pending_operation_(false),
default_quota_(kint64max),
weak_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
DCHECK(url_.is_valid());
}
SandboxFileStreamWriter::~SandboxFileStreamWriter() {}
int SandboxFileStreamWriter::Write(
net::IOBuffer* buf, int buf_len,
const net::CompletionCallback& callback) {
has_pending_operation_ = true;
if (local_file_writer_.get())
return WriteInternal(buf, buf_len, callback);
base::PlatformFileError error_code;
FileSystemOperation* operation =
file_system_context_->CreateFileSystemOperation(url_, &error_code);
if (error_code != base::PLATFORM_FILE_OK)
return net::PlatformFileErrorToNetError(error_code);
DCHECK(operation);
net::CompletionCallback write_task =
base::Bind(&SandboxFileStreamWriter::DidInitializeForWrite,
weak_factory_.GetWeakPtr(),
make_scoped_refptr(buf), buf_len, callback);
operation->GetMetadata(
url_, base::Bind(&SandboxFileStreamWriter::DidGetFileInfo,
weak_factory_.GetWeakPtr(), write_task));
return net::ERR_IO_PENDING;
}
int SandboxFileStreamWriter::Cancel(const net::CompletionCallback& callback) {
if (!has_pending_operation_)
return net::ERR_UNEXPECTED;
DCHECK(!callback.is_null());
cancel_callback_ = callback;
return net::ERR_IO_PENDING;
}
int SandboxFileStreamWriter::WriteInternal(
net::IOBuffer* buf, int buf_len,
const net::CompletionCallback& callback) {
// allowed_bytes_to_write could be negative if the file size is
// greater than the current (possibly new) quota.
DCHECK(total_bytes_written_ <= allowed_bytes_to_write_ ||
allowed_bytes_to_write_ < 0);
if (total_bytes_written_ >= allowed_bytes_to_write_) {
has_pending_operation_ = false;
return net::ERR_FILE_NO_SPACE;
}
if (buf_len > allowed_bytes_to_write_ - total_bytes_written_)
buf_len = allowed_bytes_to_write_ - total_bytes_written_;
DCHECK(local_file_writer_.get());
const int result = local_file_writer_->Write(
buf, buf_len,
base::Bind(&SandboxFileStreamWriter::DidWrite, weak_factory_.GetWeakPtr(),
callback));
if (result != net::ERR_IO_PENDING)
has_pending_operation_ = false;
return result;
}
void SandboxFileStreamWriter::DidGetFileInfo(
const net::CompletionCallback& callback,
base::PlatformFileError file_error,
const base::PlatformFileInfo& file_info,
const base::FilePath& platform_path) {
if (CancelIfRequested())
return;
if (file_error != base::PLATFORM_FILE_OK) {
callback.Run(net::PlatformFileErrorToNetError(file_error));
return;
}
if (file_info.is_directory) {
// We should not be writing to a directory.
callback.Run(net::ERR_ACCESS_DENIED);
return;
}
file_size_ = file_info.size;
if (initial_offset_ > file_size_) {
LOG(ERROR) << initial_offset_ << ", " << file_size_;
// This shouldn't happen as long as we check offset in the renderer.
NOTREACHED();
initial_offset_ = file_size_;
}
DCHECK(!local_file_writer_.get());
local_file_writer_.reset(
new LocalFileStreamWriter(platform_path, initial_offset_));
quota::QuotaManagerProxy* quota_manager_proxy =
file_system_context_->quota_manager_proxy();
if (!quota_manager_proxy) {
// If we don't have the quota manager or the requested filesystem type
// does not support quota, we should be able to let it go.
allowed_bytes_to_write_ = default_quota_;
callback.Run(net::OK);
return;
}
DCHECK(quota_manager_proxy->quota_manager());
quota_manager_proxy->quota_manager()->GetUsageAndQuota(
url_.origin(),
FileSystemTypeToQuotaStorageType(url_.type()),
base::Bind(&SandboxFileStreamWriter::DidGetUsageAndQuota,
weak_factory_.GetWeakPtr(), callback));
}
void SandboxFileStreamWriter::DidGetUsageAndQuota(
const net::CompletionCallback& callback,
quota::QuotaStatusCode status,
int64 usage, int64 quota) {
if (CancelIfRequested())
return;
if (status != quota::kQuotaStatusOk) {
LOG(WARNING) << "Got unexpected quota error : " << status;
callback.Run(net::ERR_FAILED);
return;
}
allowed_bytes_to_write_ = quota - usage;
callback.Run(net::OK);
}
void SandboxFileStreamWriter::DidInitializeForWrite(
net::IOBuffer* buf, int buf_len,
const net::CompletionCallback& callback,
int init_status) {
if (CancelIfRequested())
return;
if (init_status != net::OK) {
has_pending_operation_ = false;
callback.Run(init_status);
return;
}
allowed_bytes_to_write_ = AdjustQuotaForOverlap(
allowed_bytes_to_write_, initial_offset_, file_size_);
const int result = WriteInternal(buf, buf_len, callback);
if (result != net::ERR_IO_PENDING)
callback.Run(result);
}
void SandboxFileStreamWriter::DidWrite(
const net::CompletionCallback& callback,
int write_response) {
DCHECK(has_pending_operation_);
has_pending_operation_ = false;
if (write_response <= 0) {
if (CancelIfRequested())
return;
callback.Run(write_response);
return;
}
if (total_bytes_written_ + write_response + initial_offset_ > file_size_) {
int overlapped = file_size_ - total_bytes_written_ - initial_offset_;
if (overlapped < 0)
overlapped = 0;
observers_.Notify(&FileUpdateObserver::OnUpdate,
MakeTuple(url_, write_response - overlapped));
}
total_bytes_written_ += write_response;
if (CancelIfRequested())
return;
callback.Run(write_response);
}
bool SandboxFileStreamWriter::CancelIfRequested() {
if (cancel_callback_.is_null())
return false;
net::CompletionCallback pending_cancel = cancel_callback_;
has_pending_operation_ = false;
cancel_callback_.Reset();
pending_cancel.Run(net::OK);
return true;
}
int SandboxFileStreamWriter::Flush(const net::CompletionCallback& callback) {
// For now, Flush is meaningful only for local native file access. It is no-op
// for sandboxed filesystem files (see the discussion in crbug.com/144790).
return net::OK;
}
} // namespace fileapi
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