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// Copyright 2015 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 "blimp/net/stream_packet_writer.h"
#include <iostream>
#include "base/callback_helpers.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/message_loop/message_loop.h"
#include "base/sys_byteorder.h"
#include "blimp/common/proto/blimp_message.pb.h"
#include "blimp/net/common.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "net/socket/stream_socket.h"
namespace blimp {
std::ostream& operator<<(std::ostream& out,
const StreamPacketWriter::WriteState state) {
switch (state) {
case StreamPacketWriter::WriteState::IDLE:
out << "IDLE";
break;
case StreamPacketWriter::WriteState::HEADER:
out << "HEADER";
break;
case StreamPacketWriter::WriteState::PAYLOAD:
out << "PAYLOAD";
break;
}
return out;
}
StreamPacketWriter::StreamPacketWriter(net::StreamSocket* socket)
: write_state_(WriteState::IDLE),
socket_(socket),
header_buffer_(
new net::DrainableIOBuffer(new net::IOBuffer(kPacketHeaderSizeBytes),
kPacketHeaderSizeBytes)),
weak_factory_(this) {
DCHECK(socket_);
}
StreamPacketWriter::~StreamPacketWriter() {}
int StreamPacketWriter::WritePacket(scoped_refptr<net::DrainableIOBuffer> data,
const net::CompletionCallback& callback) {
DCHECK_EQ(WriteState::IDLE, write_state_);
DCHECK(data);
if (data->BytesRemaining() == 0) {
// The packet is empty; your argument is invalid.
DLOG(ERROR) << "Attempted to write zero-length packet.";
return net::ERR_INVALID_ARGUMENT;
}
write_state_ = WriteState::HEADER;
header_buffer_->SetOffset(0);
*reinterpret_cast<uint32*>(header_buffer_->data()) =
base::HostToNet32(data->BytesRemaining());
payload_buffer_ = data;
int result = DoWriteLoop(false);
if (result == net::ERR_IO_PENDING) {
// Store the completion callback to invoke when DoWriteLoop completes
// asynchronously.
callback_ = callback;
} else {
// Release the payload buffer, since the write operation has completed
// synchronously.
payload_buffer_ = nullptr;
}
return result;
}
int StreamPacketWriter::DoWriteLoop(int result) {
DCHECK_NE(net::ERR_IO_PENDING, result);
DCHECK_GE(result, 0);
DCHECK_NE(WriteState::IDLE, write_state_);
while (result >= 0 && write_state_ != WriteState::IDLE) {
VLOG(2) << "DoWriteLoop (state=" << write_state_ << ", result=" << result
<< ")";
switch (write_state_) {
case WriteState::HEADER:
result = DoWriteHeader(result);
break;
case WriteState::PAYLOAD:
result = DoWritePayload(result);
break;
case WriteState::IDLE:
NOTREACHED();
result = net::ERR_UNEXPECTED;
break;
}
}
return result;
}
int StreamPacketWriter::DoWriteHeader(int result) {
DCHECK_EQ(WriteState::HEADER, write_state_);
DCHECK_GE(result, 0);
header_buffer_->DidConsume(result);
if (header_buffer_->BytesRemaining() > 0) {
return socket_->Write(header_buffer_.get(),
header_buffer_->BytesRemaining(),
base::Bind(&StreamPacketWriter::OnWriteComplete,
weak_factory_.GetWeakPtr()));
}
write_state_ = WriteState::PAYLOAD;
return net::OK;
}
int StreamPacketWriter::DoWritePayload(int result) {
DCHECK_EQ(WriteState::PAYLOAD, write_state_);
DCHECK_GE(result, 0);
payload_buffer_->DidConsume(result);
if (payload_buffer_->BytesRemaining() > 0) {
return socket_->Write(payload_buffer_.get(),
payload_buffer_->BytesRemaining(),
base::Bind(&StreamPacketWriter::OnWriteComplete,
weak_factory_.GetWeakPtr()));
}
write_state_ = WriteState::IDLE;
return net::OK;
}
void StreamPacketWriter::OnWriteComplete(int result) {
DCHECK_NE(net::ERR_IO_PENDING, result);
// If the write was succesful, then process the result.
if (result > 0) {
result = DoWriteLoop(result);
}
// If the write finished, either successfully or by error, inform the
// caller.
if (result != net::ERR_IO_PENDING) {
payload_buffer_ = nullptr;
base::ResetAndReturn(&callback_).Run(result);
}
}
} // namespace blimp
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