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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_reader.h"
#include <iostream>
#include "base/callback_helpers.h"
#include "base/logging.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_loop.h"
#include "base/sys_byteorder.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 StreamPacketReader::ReadState state) {
switch (state) {
case StreamPacketReader::ReadState::HEADER:
out << "HEADER";
break;
case StreamPacketReader::ReadState::PAYLOAD:
out << "PAYLOAD";
break;
case StreamPacketReader::ReadState::IDLE:
out << "IDLE";
break;
}
return out;
}
StreamPacketReader::StreamPacketReader(net::StreamSocket* socket)
: read_state_(ReadState::IDLE), socket_(socket), weak_factory_(this) {
DCHECK(socket_);
header_buffer_ = new net::GrowableIOBuffer;
header_buffer_->SetCapacity(kPacketHeaderSizeBytes);
}
StreamPacketReader::~StreamPacketReader() {}
void StreamPacketReader::ReadPacket(
const scoped_refptr<net::GrowableIOBuffer>& buf,
const net::CompletionCallback& callback) {
DCHECK_EQ(ReadState::IDLE, read_state_);
DCHECK_GT(buf->capacity(), 0);
header_buffer_->set_offset(0);
payload_buffer_ = buf;
payload_buffer_->set_offset(0);
read_state_ = ReadState::HEADER;
int result = DoReadLoop(net::OK);
if (result != net::ERR_IO_PENDING) {
// Release the payload buffer, since the read operation has completed
// synchronously.
payload_buffer_ = nullptr;
// Adapt synchronous completion to an asynchronous style.
base::MessageLoop::current()->PostTask(
FROM_HERE,
base::Bind(callback, result == net::OK ? payload_size_ : result));
} else {
callback_ = callback;
}
}
int StreamPacketReader::DoReadLoop(int result) {
DCHECK_NE(net::ERR_IO_PENDING, result);
DCHECK_GE(result, 0);
DCHECK_NE(ReadState::IDLE, read_state_);
while (result >= 0 && read_state_ != ReadState::IDLE) {
VLOG(2) << "DoReadLoop (state=" << read_state_ << ", result=" << result
<< ")";
switch (read_state_) {
case ReadState::HEADER:
result = DoReadHeader(result);
break;
case ReadState::PAYLOAD:
result = DoReadPayload(result);
break;
case ReadState::IDLE:
NOTREACHED();
result = net::ERR_UNEXPECTED;
break;
}
}
return result;
}
int StreamPacketReader::DoReadHeader(int result) {
DCHECK_EQ(ReadState::HEADER, read_state_);
DCHECK_GT(kPacketHeaderSizeBytes,
static_cast<size_t>(header_buffer_->offset()));
DCHECK_GE(result, 0);
header_buffer_->set_offset(header_buffer_->offset() + result);
if (static_cast<size_t>(header_buffer_->offset()) < kPacketHeaderSizeBytes) {
// There is more header to read.
int result = socket_->Read(
header_buffer_.get(), kPacketHeaderSizeBytes - header_buffer_->offset(),
base::Bind(&StreamPacketReader::OnReadComplete,
weak_factory_.GetWeakPtr()));
return (result != 0 ? result : net::ERR_CONNECTION_CLOSED);
}
// Finished reading the header. Parse the size and prepare for payload read.
payload_size_ = base::NetToHost32(
*reinterpret_cast<uint32_t*>(header_buffer_->StartOfBuffer()));
if (payload_size_ > static_cast<size_t>(payload_buffer_->capacity()) ||
payload_size_ == 0) {
DLOG(ERROR) << "Illegal payload size: " << payload_size_;
return net::ERR_INVALID_RESPONSE;
}
read_state_ = ReadState::PAYLOAD;
return net::OK;
}
int StreamPacketReader::DoReadPayload(int result) {
DCHECK_EQ(ReadState::PAYLOAD, read_state_);
DCHECK_GE(result, 0);
payload_buffer_->set_offset(payload_buffer_->offset() + result);
if (static_cast<size_t>(payload_buffer_->offset()) < payload_size_) {
return socket_->Read(payload_buffer_.get(),
payload_size_ - payload_buffer_->offset(),
base::Bind(&StreamPacketReader::OnReadComplete,
weak_factory_.GetWeakPtr()));
}
// Finished reading the payload.
read_state_ = ReadState::IDLE;
payload_buffer_->set_offset(0);
return payload_size_;
}
void StreamPacketReader::OnReadComplete(int result) {
DCHECK_NE(net::ERR_IO_PENDING, result);
if (result == 0 /* EOF */) {
payload_buffer_ = nullptr;
base::ResetAndReturn(&callback_).Run(net::ERR_CONNECTION_CLOSED);
return;
}
// If the read was succesful, then process the result.
if (result > 0) {
result = DoReadLoop(result);
}
// If all reading completed, either successfully or by error, inform the
// caller.
if (result != net::ERR_IO_PENDING) {
payload_buffer_ = nullptr;
base::ResetAndReturn(&callback_)
.Run(result == net::OK ? payload_size_ : result);
}
}
} // namespace blimp
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