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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/server/http_connection.h"
#include <utility>
#include "base/logging.h"
#include "net/server/web_socket.h"
#include "net/socket/stream_socket.h"
namespace net {
HttpConnection::ReadIOBuffer::ReadIOBuffer()
: base_(base::MakeRefCounted<GrowableIOBuffer>()) {
SetCapacity(kInitialBufSize);
}
HttpConnection::ReadIOBuffer::~ReadIOBuffer() {
data_ = nullptr; // base_ owns data_.
}
int HttpConnection::ReadIOBuffer::GetCapacity() const {
return base_->capacity();
}
void HttpConnection::ReadIOBuffer::SetCapacity(int capacity) {
DCHECK_LE(GetSize(), capacity);
data_ = nullptr;
base_->SetCapacity(capacity);
data_ = base_->data();
}
bool HttpConnection::ReadIOBuffer::IncreaseCapacity() {
if (GetCapacity() >= max_buffer_size_) {
LOG(ERROR) << "Too large read data is pending: capacity=" << GetCapacity()
<< ", max_buffer_size=" << max_buffer_size_
<< ", read=" << GetSize();
return false;
}
int new_capacity = GetCapacity() * kCapacityIncreaseFactor;
if (new_capacity > max_buffer_size_)
new_capacity = max_buffer_size_;
SetCapacity(new_capacity);
return true;
}
char* HttpConnection::ReadIOBuffer::StartOfBuffer() const {
return base_->StartOfBuffer();
}
int HttpConnection::ReadIOBuffer::GetSize() const {
return base_->offset();
}
void HttpConnection::ReadIOBuffer::DidRead(int bytes) {
DCHECK_GE(RemainingCapacity(), bytes);
base_->set_offset(base_->offset() + bytes);
data_ = base_->data();
}
int HttpConnection::ReadIOBuffer::RemainingCapacity() const {
return base_->RemainingCapacity();
}
void HttpConnection::ReadIOBuffer::DidConsume(int bytes) {
int previous_size = GetSize();
int unconsumed_size = previous_size - bytes;
DCHECK_LE(0, unconsumed_size);
if (unconsumed_size > 0) {
// Move unconsumed data to the start of buffer.
memmove(StartOfBuffer(), StartOfBuffer() + bytes, unconsumed_size);
}
base_->set_offset(unconsumed_size);
data_ = base_->data();
// If capacity is too big, reduce it.
if (GetCapacity() > kMinimumBufSize &&
GetCapacity() > previous_size * kCapacityIncreaseFactor) {
int new_capacity = GetCapacity() / kCapacityIncreaseFactor;
if (new_capacity < kMinimumBufSize)
new_capacity = kMinimumBufSize;
// this avoids the pointer to dangle until `SetCapacity` gets called.
data_ = nullptr;
// realloc() within GrowableIOBuffer::SetCapacity() could move data even
// when size is reduced. If unconsumed_size == 0, i.e. no data exists in
// the buffer, free internal buffer first to guarantee no data move.
if (!unconsumed_size)
base_->SetCapacity(0);
SetCapacity(new_capacity);
}
}
HttpConnection::QueuedWriteIOBuffer::QueuedWriteIOBuffer() = default;
HttpConnection::QueuedWriteIOBuffer::~QueuedWriteIOBuffer() {
data_ = nullptr; // pending_data_ owns data_.
}
bool HttpConnection::QueuedWriteIOBuffer::IsEmpty() const {
return pending_data_.empty();
}
bool HttpConnection::QueuedWriteIOBuffer::Append(const std::string& data) {
if (data.empty())
return true;
if (total_size_ + static_cast<int>(data.size()) > max_buffer_size_) {
LOG(ERROR) << "Too large write data is pending: size="
<< total_size_ + data.size()
<< ", max_buffer_size=" << max_buffer_size_;
return false;
}
pending_data_.push(std::make_unique<std::string>(data));
total_size_ += data.size();
// If new data is the first pending data, updates data_.
if (pending_data_.size() == 1)
data_ = const_cast<char*>(pending_data_.front()->data());
return true;
}
void HttpConnection::QueuedWriteIOBuffer::DidConsume(int size) {
DCHECK_GE(total_size_, size);
DCHECK_GE(GetSizeToWrite(), size);
if (size == 0)
return;
if (size < GetSizeToWrite()) {
data_ += size;
} else { // size == GetSizeToWrite(). Updates data_ to next pending data.
data_ = nullptr;
pending_data_.pop();
data_ =
IsEmpty() ? nullptr : const_cast<char*>(pending_data_.front()->data());
}
total_size_ -= size;
}
int HttpConnection::QueuedWriteIOBuffer::GetSizeToWrite() const {
if (IsEmpty()) {
DCHECK_EQ(0, total_size_);
return 0;
}
DCHECK_GE(data_, pending_data_.front()->data());
int consumed = static_cast<int>(data_ - pending_data_.front()->data());
DCHECK_GT(static_cast<int>(pending_data_.front()->size()), consumed);
return pending_data_.front()->size() - consumed;
}
HttpConnection::HttpConnection(int id, std::unique_ptr<StreamSocket> socket)
: id_(id),
socket_(std::move(socket)),
read_buf_(base::MakeRefCounted<ReadIOBuffer>()),
write_buf_(base::MakeRefCounted<QueuedWriteIOBuffer>()) {}
HttpConnection::~HttpConnection() = default;
void HttpConnection::SetWebSocket(std::unique_ptr<WebSocket> web_socket) {
DCHECK(!web_socket_);
web_socket_ = std::move(web_socket);
}
} // namespace net
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