webkit/browser/fileapi/file_writer_delegate.cc - platform/external/chromium_org - Git at Google

 // 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/browser/fileapi/file_writer_delegate.h"

 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file_util_proxy.h"
 #include "base/message_loop/message_loop.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/sequenced_task_runner.h"
 #include "base/threading/thread_restrictions.h"
 #include "net/base/net_errors.h"
 #include "webkit/browser/fileapi/file_stream_writer.h"
 #include "webkit/browser/fileapi/file_system_context.h"

 namespace fileapi {

 static const int kReadBufSize = 32768;

 namespace {

 base::PlatformFileError NetErrorToPlatformFileError(int error) {
 // TODO(kinuko): Move this static method to more convenient place.
   switch (error) {
     case net::OK:
       return base::PLATFORM_FILE_OK;
     case net::ERR_FILE_NO_SPACE:
       return base::PLATFORM_FILE_ERROR_NO_SPACE;
     case net::ERR_FILE_NOT_FOUND:
       return base::PLATFORM_FILE_ERROR_NOT_FOUND;
     case net::ERR_ACCESS_DENIED:
       return base::PLATFORM_FILE_ERROR_ACCESS_DENIED;
     default:
       return base::PLATFORM_FILE_ERROR_FAILED;
   }
 }

 }  // namespace

 FileWriterDelegate::FileWriterDelegate(
     scoped_ptr<FileStreamWriter> file_stream_writer)
     : file_stream_writer_(file_stream_writer.Pass()),
       writing_started_(false),
       bytes_written_backlog_(0),
       bytes_written_(0),
       bytes_read_(0),
       io_buffer_(new net::IOBufferWithSize(kReadBufSize)),
       weak_factory_(this) {
 }

 FileWriterDelegate::~FileWriterDelegate() {
 }

 void FileWriterDelegate::Start(scoped_ptr<net::URLRequest> request,
                                const DelegateWriteCallback& write_callback) {
   write_callback_ = write_callback;
   request_ = request.Pass();
   request_->Start();
 }

 void FileWriterDelegate::Cancel() {
   if (request_) {
     // This halts any callbacks on this delegate.
     request_->set_delegate(NULL);
     request_->Cancel();
   }

   const int status = file_stream_writer_->Cancel(
       base::Bind(&FileWriterDelegate::OnWriteCancelled,
                  weak_factory_.GetWeakPtr()));
   // Return true to finish immediately if we have no pending writes.
   // Otherwise we'll do the final cleanup in the Cancel callback.
   if (status != net::ERR_IO_PENDING) {
     write_callback_.Run(base::PLATFORM_FILE_ERROR_ABORT, 0,
                         GetCompletionStatusOnError());
   }
 }

 void FileWriterDelegate::OnReceivedRedirect(net::URLRequest* request,
                                             const GURL& new_url,
                                             bool* defer_redirect) {
   NOTREACHED();
   OnError(base::PLATFORM_FILE_ERROR_SECURITY);
 }

 void FileWriterDelegate::OnAuthRequired(net::URLRequest* request,
                                         net::AuthChallengeInfo* auth_info) {
   NOTREACHED();
   OnError(base::PLATFORM_FILE_ERROR_SECURITY);
 }

 void FileWriterDelegate::OnCertificateRequested(
     net::URLRequest* request,
     net::SSLCertRequestInfo* cert_request_info) {
   NOTREACHED();
   OnError(base::PLATFORM_FILE_ERROR_SECURITY);
 }

 void FileWriterDelegate::OnSSLCertificateError(net::URLRequest* request,
                                                const net::SSLInfo& ssl_info,
                                                bool fatal) {
   NOTREACHED();
   OnError(base::PLATFORM_FILE_ERROR_SECURITY);
 }

 void FileWriterDelegate::OnResponseStarted(net::URLRequest* request) {
   DCHECK_EQ(request_.get(), request);
   if (!request->status().is_success() || request->GetResponseCode() != 200) {
     OnError(base::PLATFORM_FILE_ERROR_FAILED);
     return;
   }
   Read();
 }

 void FileWriterDelegate::OnReadCompleted(net::URLRequest* request,
                                          int bytes_read) {
   DCHECK_EQ(request_.get(), request);
   if (!request->status().is_success()) {
     OnError(base::PLATFORM_FILE_ERROR_FAILED);
     return;
   }
   OnDataReceived(bytes_read);
 }

 void FileWriterDelegate::Read() {
   bytes_written_ = 0;
   bytes_read_ = 0;
   if (request_->Read(io_buffer_.get(), io_buffer_->size(), &bytes_read_)) {
     base::MessageLoop::current()->PostTask(
         FROM_HERE,
         base::Bind(&FileWriterDelegate::OnDataReceived,
                    weak_factory_.GetWeakPtr(), bytes_read_));
   } else if (!request_->status().is_io_pending()) {
     OnError(base::PLATFORM_FILE_ERROR_FAILED);
   }
 }

 void FileWriterDelegate::OnDataReceived(int bytes_read) {
   bytes_read_ = bytes_read;
   if (!bytes_read_) {  // We're done.
     OnProgress(0, true);
   } else {
     // This could easily be optimized to rotate between a pool of buffers, so
     // that we could read and write at the same time.  It's not yet clear that
     // it's necessary.
     cursor_ = new net::DrainableIOBuffer(io_buffer_.get(), bytes_read_);
     Write();
   }
 }

 void FileWriterDelegate::Write() {
   writing_started_ = true;
   int64 bytes_to_write = bytes_read_ - bytes_written_;
   int write_response =
       file_stream_writer_->Write(cursor_.get(),
                                  static_cast<int>(bytes_to_write),
                                  base::Bind(&FileWriterDelegate::OnDataWritten,
                                             weak_factory_.GetWeakPtr()));
   if (write_response > 0) {
     base::MessageLoop::current()->PostTask(
         FROM_HERE,
         base::Bind(&FileWriterDelegate::OnDataWritten,
                    weak_factory_.GetWeakPtr(), write_response));
   } else if (net::ERR_IO_PENDING != write_response) {
     OnError(NetErrorToPlatformFileError(write_response));
   }
 }

 void FileWriterDelegate::OnDataWritten(int write_response) {
   if (write_response > 0) {
     OnProgress(write_response, false);
     cursor_->DidConsume(write_response);
     bytes_written_ += write_response;
     if (bytes_written_ == bytes_read_)
       Read();
     else
       Write();
   } else {
     OnError(NetErrorToPlatformFileError(write_response));
   }
 }

 FileWriterDelegate::WriteProgressStatus
 FileWriterDelegate::GetCompletionStatusOnError() const {
   return writing_started_ ? ERROR_WRITE_STARTED : ERROR_WRITE_NOT_STARTED;
 }

 void FileWriterDelegate::OnError(base::PlatformFileError error) {
   if (request_) {
     request_->set_delegate(NULL);
     request_->Cancel();
   }

   if (writing_started_)
     FlushForCompletion(error, 0, ERROR_WRITE_STARTED);
   else
     write_callback_.Run(error, 0, ERROR_WRITE_NOT_STARTED);
 }

 void FileWriterDelegate::OnProgress(int bytes_written, bool done) {
   DCHECK(bytes_written + bytes_written_backlog_ >= bytes_written_backlog_);
   static const int kMinProgressDelayMS = 200;
   base::Time currentTime = base::Time::Now();
   if (done || last_progress_event_time_.is_null() ||
       (currentTime - last_progress_event_time_).InMilliseconds() >
           kMinProgressDelayMS) {
     bytes_written += bytes_written_backlog_;
     last_progress_event_time_ = currentTime;
     bytes_written_backlog_ = 0;

     if (done) {
       FlushForCompletion(base::PLATFORM_FILE_OK, bytes_written,
                          SUCCESS_COMPLETED);
     } else {
       write_callback_.Run(base::PLATFORM_FILE_OK, bytes_written,
                           SUCCESS_IO_PENDING);
     }
     return;
   }
   bytes_written_backlog_ += bytes_written;
 }

 void FileWriterDelegate::OnWriteCancelled(int status) {
   write_callback_.Run(base::PLATFORM_FILE_ERROR_ABORT, 0,
                       GetCompletionStatusOnError());
 }

 void FileWriterDelegate::FlushForCompletion(
     base::PlatformFileError error,
     int bytes_written,
     WriteProgressStatus progress_status) {
   int flush_error = file_stream_writer_->Flush(
       base::Bind(&FileWriterDelegate::OnFlushed, weak_factory_.GetWeakPtr(),
                  error, bytes_written, progress_status));
   if (flush_error != net::ERR_IO_PENDING)
     OnFlushed(error, bytes_written, progress_status, flush_error);
 }

 void FileWriterDelegate::OnFlushed(base::PlatformFileError error,
                                    int bytes_written,
                                    WriteProgressStatus progress_status,
                                    int flush_error) {
   if (error == base::PLATFORM_FILE_OK && flush_error != net::OK) {
     // If the Flush introduced an error, overwrite the status.
     // Otherwise, keep the original error status.
     error = NetErrorToPlatformFileError(flush_error);
     progress_status = GetCompletionStatusOnError();
   }
   write_callback_.Run(error, bytes_written, progress_status);
 }

 }  // namespace fileapi
	// 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/browser/fileapi/file_writer_delegate.h"

	#include "base/bind.h"
	#include "base/callback.h"
	#include "base/files/file_util_proxy.h"
	#include "base/message_loop/message_loop.h"
	#include "base/message_loop/message_loop_proxy.h"
	#include "base/sequenced_task_runner.h"
	#include "base/threading/thread_restrictions.h"
	#include "net/base/net_errors.h"
	#include "webkit/browser/fileapi/file_stream_writer.h"
	#include "webkit/browser/fileapi/file_system_context.h"

	namespace fileapi {

	static const int kReadBufSize = 32768;

	namespace {

	base::PlatformFileError NetErrorToPlatformFileError(int error) {
	// TODO(kinuko): Move this static method to more convenient place.
	switch (error) {
	case net::OK:
	return base::PLATFORM_FILE_OK;
	case net::ERR_FILE_NO_SPACE:
	return base::PLATFORM_FILE_ERROR_NO_SPACE;
	case net::ERR_FILE_NOT_FOUND:
	return base::PLATFORM_FILE_ERROR_NOT_FOUND;
	case net::ERR_ACCESS_DENIED:
	return base::PLATFORM_FILE_ERROR_ACCESS_DENIED;
	default:
	return base::PLATFORM_FILE_ERROR_FAILED;
	}
	}

	} // namespace

	FileWriterDelegate::FileWriterDelegate(
	scoped_ptr<FileStreamWriter> file_stream_writer)
	: file_stream_writer_(file_stream_writer.Pass()),
	writing_started_(false),
	bytes_written_backlog_(0),
	bytes_written_(0),
	bytes_read_(0),
	io_buffer_(new net::IOBufferWithSize(kReadBufSize)),
	weak_factory_(this) {
	}

	FileWriterDelegate::~FileWriterDelegate() {
	}

	void FileWriterDelegate::Start(scoped_ptr<net::URLRequest> request,
	const DelegateWriteCallback& write_callback) {
	write_callback_ = write_callback;
	request_ = request.Pass();
	request_->Start();
	}

	void FileWriterDelegate::Cancel() {
	if (request_) {
	// This halts any callbacks on this delegate.
	request_->set_delegate(NULL);
	request_->Cancel();
	}

	const int status = file_stream_writer_->Cancel(
	base::Bind(&FileWriterDelegate::OnWriteCancelled,
	weak_factory_.GetWeakPtr()));
	// Return true to finish immediately if we have no pending writes.
	// Otherwise we'll do the final cleanup in the Cancel callback.
	if (status != net::ERR_IO_PENDING) {
	write_callback_.Run(base::PLATFORM_FILE_ERROR_ABORT, 0,
	GetCompletionStatusOnError());
	}
	}

	void FileWriterDelegate::OnReceivedRedirect(net::URLRequest* request,
	const GURL& new_url,
	bool* defer_redirect) {
	NOTREACHED();
	OnError(base::PLATFORM_FILE_ERROR_SECURITY);
	}

	void FileWriterDelegate::OnAuthRequired(net::URLRequest* request,
	net::AuthChallengeInfo* auth_info) {
	NOTREACHED();
	OnError(base::PLATFORM_FILE_ERROR_SECURITY);
	}

	void FileWriterDelegate::OnCertificateRequested(
	net::URLRequest* request,
	net::SSLCertRequestInfo* cert_request_info) {
	NOTREACHED();
	OnError(base::PLATFORM_FILE_ERROR_SECURITY);
	}

	void FileWriterDelegate::OnSSLCertificateError(net::URLRequest* request,
	const net::SSLInfo& ssl_info,
	bool fatal) {
	NOTREACHED();
	OnError(base::PLATFORM_FILE_ERROR_SECURITY);
	}

	void FileWriterDelegate::OnResponseStarted(net::URLRequest* request) {
	DCHECK_EQ(request_.get(), request);
	if (!request->status().is_success() \|\| request->GetResponseCode() != 200) {
	OnError(base::PLATFORM_FILE_ERROR_FAILED);
	return;
	}
	Read();
	}

	void FileWriterDelegate::OnReadCompleted(net::URLRequest* request,
	int bytes_read) {
	DCHECK_EQ(request_.get(), request);
	if (!request->status().is_success()) {
	OnError(base::PLATFORM_FILE_ERROR_FAILED);
	return;
	}
	OnDataReceived(bytes_read);
	}

	void FileWriterDelegate::Read() {
	bytes_written_ = 0;
	bytes_read_ = 0;
	if (request_->Read(io_buffer_.get(), io_buffer_->size(), &bytes_read_)) {
	base::MessageLoop::current()->PostTask(
	FROM_HERE,
	base::Bind(&FileWriterDelegate::OnDataReceived,
	weak_factory_.GetWeakPtr(), bytes_read_));
	} else if (!request_->status().is_io_pending()) {
	OnError(base::PLATFORM_FILE_ERROR_FAILED);
	}
	}

	void FileWriterDelegate::OnDataReceived(int bytes_read) {
	bytes_read_ = bytes_read;
	if (!bytes_read_) { // We're done.
	OnProgress(0, true);
	} else {
	// This could easily be optimized to rotate between a pool of buffers, so
	// that we could read and write at the same time. It's not yet clear that
	// it's necessary.
	cursor_ = new net::DrainableIOBuffer(io_buffer_.get(), bytes_read_);
	Write();
	}
	}

	void FileWriterDelegate::Write() {
	writing_started_ = true;
	int64 bytes_to_write = bytes_read_ - bytes_written_;
	int write_response =
	file_stream_writer_->Write(cursor_.get(),
	static_cast<int>(bytes_to_write),
	base::Bind(&FileWriterDelegate::OnDataWritten,
	weak_factory_.GetWeakPtr()));
	if (write_response > 0) {
	base::MessageLoop::current()->PostTask(
	FROM_HERE,
	base::Bind(&FileWriterDelegate::OnDataWritten,
	weak_factory_.GetWeakPtr(), write_response));
	} else if (net::ERR_IO_PENDING != write_response) {
	OnError(NetErrorToPlatformFileError(write_response));
	}
	}

	void FileWriterDelegate::OnDataWritten(int write_response) {
	if (write_response > 0) {
	OnProgress(write_response, false);
	cursor_->DidConsume(write_response);
	bytes_written_ += write_response;
	if (bytes_written_ == bytes_read_)
	Read();
	else
	Write();
	} else {
	OnError(NetErrorToPlatformFileError(write_response));
	}
	}

	FileWriterDelegate::WriteProgressStatus
	FileWriterDelegate::GetCompletionStatusOnError() const {
	return writing_started_ ? ERROR_WRITE_STARTED : ERROR_WRITE_NOT_STARTED;
	}

	void FileWriterDelegate::OnError(base::PlatformFileError error) {
	if (request_) {
	request_->set_delegate(NULL);
	request_->Cancel();
	}

	if (writing_started_)
	FlushForCompletion(error, 0, ERROR_WRITE_STARTED);
	else
	write_callback_.Run(error, 0, ERROR_WRITE_NOT_STARTED);
	}

	void FileWriterDelegate::OnProgress(int bytes_written, bool done) {
	DCHECK(bytes_written + bytes_written_backlog_ >= bytes_written_backlog_);
	static const int kMinProgressDelayMS = 200;
	base::Time currentTime = base::Time::Now();
	if (done \|\| last_progress_event_time_.is_null() \|\|
	(currentTime - last_progress_event_time_).InMilliseconds() >
	kMinProgressDelayMS) {
	bytes_written += bytes_written_backlog_;
	last_progress_event_time_ = currentTime;
	bytes_written_backlog_ = 0;

	if (done) {
	FlushForCompletion(base::PLATFORM_FILE_OK, bytes_written,
	SUCCESS_COMPLETED);
	} else {
	write_callback_.Run(base::PLATFORM_FILE_OK, bytes_written,
	SUCCESS_IO_PENDING);
	}
	return;
	}
	bytes_written_backlog_ += bytes_written;
	}

	void FileWriterDelegate::OnWriteCancelled(int status) {
	write_callback_.Run(base::PLATFORM_FILE_ERROR_ABORT, 0,
	GetCompletionStatusOnError());
	}

	void FileWriterDelegate::FlushForCompletion(
	base::PlatformFileError error,
	int bytes_written,
	WriteProgressStatus progress_status) {
	int flush_error = file_stream_writer_->Flush(
	base::Bind(&FileWriterDelegate::OnFlushed, weak_factory_.GetWeakPtr(),
	error, bytes_written, progress_status));
	if (flush_error != net::ERR_IO_PENDING)
	OnFlushed(error, bytes_written, progress_status, flush_error);
	}

	void FileWriterDelegate::OnFlushed(base::PlatformFileError error,
	int bytes_written,
	WriteProgressStatus progress_status,
	int flush_error) {
	if (error == base::PLATFORM_FILE_OK && flush_error != net::OK) {
	// If the Flush introduced an error, overwrite the status.
	// Otherwise, keep the original error status.
	error = NetErrorToPlatformFileError(flush_error);
	progress_status = GetCompletionStatusOnError();
	}
	write_callback_.Run(error, bytes_written, progress_status);
	}

	} // namespace fileapi