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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/support/simple_file_writer.h"
#include "base/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/message_loop/message_loop_proxy.h"
#include "net/url_request/url_request_context.h"
#include "webkit/browser/fileapi/file_system_context.h"
#include "webkit/browser/fileapi/file_system_operation_runner.h"
#include "webkit/browser/fileapi/file_system_url.h"
#include "webkit/common/fileapi/file_system_types.h"
#include "webkit/glue/webkit_glue.h"
#include "webkit/support/simple_resource_loader_bridge.h"
using fileapi::FileSystemURL;
using fileapi::FileSystemContext;
using fileapi::FileSystemOperationRunner;
using fileapi::WebFileWriterBase;
using WebKit::WebFileWriterClient;
using WebKit::WebString;
using WebKit::WebURL;
net::URLRequestContext* SimpleFileWriter::request_context_ = NULL;
// Helper class to proxy to write and truncate calls to the IO thread,
// and to proxy the results back to the main thead. There is a one-to-one
// relationship between SimpleFileWriters and IOThreadBackends.
class SimpleFileWriter::IOThreadProxy
: public base::RefCountedThreadSafe<SimpleFileWriter::IOThreadProxy> {
public:
IOThreadProxy(const base::WeakPtr<SimpleFileWriter>& simple_writer,
FileSystemContext* file_system_context)
: simple_writer_(simple_writer),
operation_id_(FileSystemOperationRunner::kErrorOperationID),
file_system_context_(file_system_context) {
// The IO thread needs to be running for this class to work.
SimpleResourceLoaderBridge::EnsureIOThread();
io_thread_ = SimpleResourceLoaderBridge::GetIoThread();
main_thread_ = base::MessageLoopProxy::current();
}
void Truncate(const FileSystemURL& url, int64 offset) {
if (!io_thread_->BelongsToCurrentThread()) {
io_thread_->PostTask(
FROM_HERE,
base::Bind(&IOThreadProxy::Truncate, this, url, offset));
return;
}
if (FailIfNotWritable(url))
return;
DCHECK_EQ(FileSystemOperationRunner::kErrorOperationID, operation_id_);
operation_id_ = file_system_context_->operation_runner()->Truncate(
url, offset, base::Bind(&IOThreadProxy::DidFinish, this));
}
void Write(const FileSystemURL& url, const GURL& blob_url, int64 offset) {
if (!io_thread_->BelongsToCurrentThread()) {
io_thread_->PostTask(
FROM_HERE,
base::Bind(&IOThreadProxy::Write, this, url, blob_url, offset));
return;
}
if (FailIfNotWritable(url))
return;
DCHECK(request_context_);
DCHECK_EQ(FileSystemOperationRunner::kErrorOperationID, operation_id_);
operation_id_ = file_system_context_->operation_runner()->Write(
request_context_, url, blob_url, offset,
base::Bind(&IOThreadProxy::DidWrite, this));
}
void Cancel() {
if (!io_thread_->BelongsToCurrentThread()) {
io_thread_->PostTask(
FROM_HERE,
base::Bind(&IOThreadProxy::Cancel, this));
return;
}
if (operation_id_ == FileSystemOperationRunner::kErrorOperationID) {
DidFailOnMainThread(base::PLATFORM_FILE_ERROR_INVALID_OPERATION);
return;
}
file_system_context_->operation_runner()->Cancel(
operation_id_, base::Bind(&IOThreadProxy::DidFinish, this));
}
private:
friend class base::RefCountedThreadSafe<IOThreadProxy>;
virtual ~IOThreadProxy() {}
// Returns true if it is not writable.
bool FailIfNotWritable(const FileSystemURL& url) {
if (url.type() == fileapi::kFileSystemTypeDragged) {
// Write is not allowed in isolate file system in SimpleFileWriter.
DidFailOnMainThread(base::PLATFORM_FILE_ERROR_SECURITY);
return true;
}
return false;
}
void DidSucceedOnMainThread() {
if (!main_thread_->BelongsToCurrentThread()) {
main_thread_->PostTask(
FROM_HERE,
base::Bind(&IOThreadProxy::DidSucceedOnMainThread, this));
return;
}
if (simple_writer_.get())
simple_writer_->DidSucceed();
}
void DidFailOnMainThread(base::PlatformFileError error_code) {
if (!main_thread_->BelongsToCurrentThread()) {
main_thread_->PostTask(
FROM_HERE,
base::Bind(&IOThreadProxy::DidFailOnMainThread, this, error_code));
return;
}
if (simple_writer_.get())
simple_writer_->DidFail(error_code);
}
void DidWriteOnMainThread(int64 bytes, bool complete) {
if (!main_thread_->BelongsToCurrentThread()) {
main_thread_->PostTask(
FROM_HERE,
base::Bind(&IOThreadProxy::DidWriteOnMainThread,
this, bytes, complete));
return;
}
if (simple_writer_.get())
simple_writer_->DidWrite(bytes, complete);
}
void ClearOperation() {
DCHECK(io_thread_->BelongsToCurrentThread());
operation_id_ = FileSystemOperationRunner::kErrorOperationID;
}
void DidFinish(base::PlatformFileError result) {
if (result == base::PLATFORM_FILE_OK)
DidSucceedOnMainThread();
else
DidFailOnMainThread(result);
ClearOperation();
}
void DidWrite(base::PlatformFileError result, int64 bytes, bool complete) {
if (result == base::PLATFORM_FILE_OK) {
DidWriteOnMainThread(bytes, complete);
if (complete)
ClearOperation();
} else {
DidFailOnMainThread(result);
ClearOperation();
}
}
scoped_refptr<base::MessageLoopProxy> io_thread_;
scoped_refptr<base::MessageLoopProxy> main_thread_;
// Only used on the main thread.
base::WeakPtr<SimpleFileWriter> simple_writer_;
// Only used on the io thread.
FileSystemOperationRunner::OperationID operation_id_;
scoped_refptr<FileSystemContext> file_system_context_;
};
SimpleFileWriter::SimpleFileWriter(
const GURL& path,
WebFileWriterClient* client,
FileSystemContext* file_system_context)
: WebFileWriterBase(path, client),
file_system_context_(file_system_context),
io_thread_proxy_(new IOThreadProxy(AsWeakPtr(), file_system_context)) {
}
SimpleFileWriter::~SimpleFileWriter() {
}
void SimpleFileWriter::DoTruncate(const GURL& path, int64 offset) {
FileSystemURL url = file_system_context_->CrackURL(path);
io_thread_proxy_->Truncate(url, offset);
}
void SimpleFileWriter::DoWrite(
const GURL& path, const GURL& blob_url, int64 offset) {
FileSystemURL url = file_system_context_->CrackURL(path);
io_thread_proxy_->Write(url, blob_url, offset);
}
void SimpleFileWriter::DoCancel() {
io_thread_proxy_->Cancel();
}
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