| // Copyright 2013 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 "google_apis/gcm/base/socket_stream.h" |
| |
| #include <stddef.h> |
| |
| #include "base/bind.h" |
| #include "base/callback.h" |
| #include "net/base/io_buffer.h" |
| #include "net/socket/stream_socket.h" |
| |
| namespace gcm { |
| |
| namespace { |
| |
| // TODO(zea): consider having dynamically-sized buffers if this becomes too |
| // expensive. |
| const size_t kDefaultBufferSize = 8*1024; |
| |
| } // namespace |
| |
| SocketInputStream::SocketInputStream(net::StreamSocket* socket) |
| : socket_(socket), |
| io_buffer_(new net::IOBuffer(kDefaultBufferSize)), |
| read_buffer_(new net::DrainableIOBuffer(io_buffer_.get(), |
| kDefaultBufferSize)), |
| next_pos_(0), |
| last_error_(net::OK), |
| weak_ptr_factory_(this) { |
| DCHECK(socket->IsConnected()); |
| } |
| |
| SocketInputStream::~SocketInputStream() { |
| } |
| |
| bool SocketInputStream::Next(const void** data, int* size) { |
| if (GetState() != EMPTY && GetState() != READY) { |
| NOTREACHED() << "Invalid input stream read attempt."; |
| return false; |
| } |
| |
| if (GetState() == EMPTY) { |
| DVLOG(1) << "No unread data remaining, ending read."; |
| return false; |
| } |
| |
| DCHECK_EQ(GetState(), READY) |
| << " Input stream must have pending data before reading."; |
| DCHECK_LT(next_pos_, read_buffer_->BytesConsumed()); |
| *data = io_buffer_->data() + next_pos_; |
| *size = UnreadByteCount(); |
| next_pos_ = read_buffer_->BytesConsumed(); |
| DVLOG(1) << "Consuming " << *size << " bytes in input buffer."; |
| return true; |
| } |
| |
| void SocketInputStream::BackUp(int count) { |
| DCHECK(GetState() == READY || GetState() == EMPTY); |
| // TODO(zea): investigating crbug.com/409985 |
| CHECK_GT(count, 0); |
| CHECK_LE(count, next_pos_); |
| |
| next_pos_ -= count; |
| DVLOG(1) << "Backing up " << count << " bytes in input buffer. " |
| << "Current position now at " << next_pos_ |
| << " of " << read_buffer_->BytesConsumed(); |
| } |
| |
| bool SocketInputStream::Skip(int count) { |
| NOTIMPLEMENTED(); |
| return false; |
| } |
| |
| int64_t SocketInputStream::ByteCount() const { |
| DCHECK_NE(GetState(), CLOSED); |
| DCHECK_NE(GetState(), READING); |
| return next_pos_; |
| } |
| |
| int SocketInputStream::UnreadByteCount() const { |
| DCHECK_NE(GetState(), CLOSED); |
| DCHECK_NE(GetState(), READING); |
| return read_buffer_->BytesConsumed() - next_pos_; |
| } |
| |
| net::Error SocketInputStream::Refresh(const base::Closure& callback, |
| int byte_limit) { |
| DCHECK_NE(GetState(), CLOSED); |
| DCHECK_NE(GetState(), READING); |
| DCHECK_GT(byte_limit, 0); |
| |
| if (byte_limit > read_buffer_->BytesRemaining()) { |
| LOG(ERROR) << "Out of buffer space, closing input stream."; |
| CloseStream(net::ERR_FILE_TOO_BIG, base::Closure()); |
| return net::OK; |
| } |
| |
| if (!socket_->IsConnected()) { |
| LOG(ERROR) << "Socket was disconnected, closing input stream"; |
| CloseStream(net::ERR_CONNECTION_CLOSED, base::Closure()); |
| return net::OK; |
| } |
| |
| DVLOG(1) << "Refreshing input stream, limit of " << byte_limit << " bytes."; |
| int result = |
| socket_->Read(read_buffer_.get(), |
| byte_limit, |
| base::Bind(&SocketInputStream::RefreshCompletionCallback, |
| weak_ptr_factory_.GetWeakPtr(), |
| callback)); |
| DVLOG(1) << "Read returned " << result; |
| if (result == net::ERR_IO_PENDING) { |
| last_error_ = net::ERR_IO_PENDING; |
| return net::ERR_IO_PENDING; |
| } |
| |
| RefreshCompletionCallback(base::Closure(), result); |
| return net::OK; |
| } |
| |
| void SocketInputStream::RebuildBuffer() { |
| DVLOG(1) << "Rebuilding input stream, consumed " |
| << next_pos_ << " bytes."; |
| DCHECK_NE(GetState(), READING); |
| DCHECK_NE(GetState(), CLOSED); |
| |
| int unread_data_size = 0; |
| const void* unread_data_ptr = NULL; |
| Next(&unread_data_ptr, &unread_data_size); |
| ResetInternal(); |
| |
| if (unread_data_ptr != io_buffer_->data()) { |
| DVLOG(1) << "Have " << unread_data_size |
| << " unread bytes remaining, shifting."; |
| // Move any remaining unread data to the start of the buffer; |
| std::memmove(io_buffer_->data(), unread_data_ptr, unread_data_size); |
| } else { |
| DVLOG(1) << "Have " << unread_data_size << " unread bytes remaining."; |
| } |
| read_buffer_->DidConsume(unread_data_size); |
| // TODO(zea): investigating crbug.com/409985 |
| CHECK_GE(UnreadByteCount(), 0); |
| } |
| |
| net::Error SocketInputStream::last_error() const { |
| return last_error_; |
| } |
| |
| SocketInputStream::State SocketInputStream::GetState() const { |
| if (last_error_ < net::ERR_IO_PENDING) |
| return CLOSED; |
| |
| if (last_error_ == net::ERR_IO_PENDING) |
| return READING; |
| |
| DCHECK_EQ(last_error_, net::OK); |
| if (read_buffer_->BytesConsumed() == next_pos_) |
| return EMPTY; |
| |
| return READY; |
| } |
| |
| void SocketInputStream::RefreshCompletionCallback( |
| const base::Closure& callback, int result) { |
| // If an error occurred before the completion callback could complete, ignore |
| // the result. |
| if (GetState() == CLOSED) |
| return; |
| |
| // Result == 0 implies EOF, which is treated as an error. |
| if (result == 0) |
| result = net::ERR_CONNECTION_CLOSED; |
| |
| DCHECK_NE(result, net::ERR_IO_PENDING); |
| |
| if (result < net::OK) { |
| DVLOG(1) << "Failed to refresh socket: " << result; |
| CloseStream(static_cast<net::Error>(result), callback); |
| return; |
| } |
| |
| DCHECK_GT(result, 0); |
| last_error_ = net::OK; |
| read_buffer_->DidConsume(result); |
| // TODO(zea): investigating crbug.com/409985 |
| CHECK_GT(UnreadByteCount(), 0); |
| |
| DVLOG(1) << "Refresh complete with " << result << " new bytes. " |
| << "Current position " << next_pos_ |
| << " of " << read_buffer_->BytesConsumed() << "."; |
| |
| if (!callback.is_null()) |
| callback.Run(); |
| } |
| |
| void SocketInputStream::ResetInternal() { |
| read_buffer_->SetOffset(0); |
| next_pos_ = 0; |
| last_error_ = net::OK; |
| weak_ptr_factory_.InvalidateWeakPtrs(); // Invalidate any callbacks. |
| } |
| |
| void SocketInputStream::CloseStream(net::Error error, |
| const base::Closure& callback) { |
| DCHECK_LT(error, net::ERR_IO_PENDING); |
| ResetInternal(); |
| last_error_ = error; |
| LOG(ERROR) << "Closing stream with result " << error; |
| if (!callback.is_null()) |
| callback.Run(); |
| } |
| |
| SocketOutputStream::SocketOutputStream(net::StreamSocket* socket) |
| : socket_(socket), |
| io_buffer_(new net::IOBuffer(kDefaultBufferSize)), |
| write_buffer_(new net::DrainableIOBuffer(io_buffer_.get(), |
| kDefaultBufferSize)), |
| next_pos_(0), |
| last_error_(net::OK), |
| weak_ptr_factory_(this) { |
| DCHECK(socket->IsConnected()); |
| } |
| |
| SocketOutputStream::~SocketOutputStream() { |
| } |
| |
| bool SocketOutputStream::Next(void** data, int* size) { |
| DCHECK_NE(GetState(), CLOSED); |
| DCHECK_NE(GetState(), FLUSHING); |
| if (next_pos_ == write_buffer_->size()) |
| return false; |
| |
| *data = write_buffer_->data() + next_pos_; |
| *size = write_buffer_->size() - next_pos_; |
| next_pos_ = write_buffer_->size(); |
| return true; |
| } |
| |
| void SocketOutputStream::BackUp(int count) { |
| DCHECK_GE(count, 0); |
| if (count > next_pos_) |
| next_pos_ = 0; |
| next_pos_ -= count; |
| DVLOG(1) << "Backing up " << count << " bytes in output buffer. " |
| << next_pos_ << " bytes used."; |
| } |
| |
| int64_t SocketOutputStream::ByteCount() const { |
| DCHECK_NE(GetState(), CLOSED); |
| DCHECK_NE(GetState(), FLUSHING); |
| return next_pos_; |
| } |
| |
| net::Error SocketOutputStream::Flush(const base::Closure& callback) { |
| DCHECK_EQ(GetState(), READY); |
| |
| if (!socket_->IsConnected()) { |
| LOG(ERROR) << "Socket was disconnected, closing output stream"; |
| last_error_ = net::ERR_CONNECTION_CLOSED; |
| return net::OK; |
| } |
| |
| DVLOG(1) << "Flushing " << next_pos_ << " bytes into socket."; |
| int result = |
| socket_->Write(write_buffer_.get(), |
| next_pos_, |
| base::Bind(&SocketOutputStream::FlushCompletionCallback, |
| weak_ptr_factory_.GetWeakPtr(), |
| callback)); |
| DVLOG(1) << "Write returned " << result; |
| if (result == net::ERR_IO_PENDING) { |
| last_error_ = net::ERR_IO_PENDING; |
| return net::ERR_IO_PENDING; |
| } |
| |
| FlushCompletionCallback(base::Closure(), result); |
| return net::OK; |
| } |
| |
| SocketOutputStream::State SocketOutputStream::GetState() const{ |
| if (last_error_ < net::ERR_IO_PENDING) |
| return CLOSED; |
| |
| if (last_error_ == net::ERR_IO_PENDING) |
| return FLUSHING; |
| |
| DCHECK_EQ(last_error_, net::OK); |
| if (next_pos_ == 0) |
| return EMPTY; |
| |
| return READY; |
| } |
| |
| net::Error SocketOutputStream::last_error() const { |
| return last_error_; |
| } |
| |
| void SocketOutputStream::FlushCompletionCallback( |
| const base::Closure& callback, int result) { |
| // If an error occurred before the completion callback could complete, ignore |
| // the result. |
| if (GetState() == CLOSED) |
| return; |
| |
| // Result == 0 implies EOF, which is treated as an error. |
| if (result == 0) |
| result = net::ERR_CONNECTION_CLOSED; |
| |
| DCHECK_NE(result, net::ERR_IO_PENDING); |
| |
| if (result < net::OK) { |
| LOG(ERROR) << "Failed to flush socket."; |
| last_error_ = static_cast<net::Error>(result); |
| if (!callback.is_null()) |
| callback.Run(); |
| return; |
| } |
| |
| DCHECK_GT(result, net::OK); |
| last_error_ = net::OK; |
| |
| if (write_buffer_->BytesConsumed() + result < next_pos_) { |
| DVLOG(1) << "Partial flush complete. Retrying."; |
| // Only a partial write was completed. Flush again to finish the write. |
| write_buffer_->DidConsume(result); |
| Flush(callback); |
| return; |
| } |
| |
| DVLOG(1) << "Socket flush complete."; |
| write_buffer_->SetOffset(0); |
| next_pos_ = 0; |
| if (!callback.is_null()) |
| callback.Run(); |
| } |
| |
| } // namespace gcm |