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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 <ranges>
#include <utility>
#include "base/containers/span.h"
#include "base/logging.h"
#include "base/numerics/checked_math.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() {
// Avoid dangling ptr when `base_` is destroyed.
ClearSpan();
}
int HttpConnection::ReadIOBuffer::GetCapacity() const {
return base_->capacity();
}
void HttpConnection::ReadIOBuffer::SetCapacity(int capacity) {
CHECK_LE(base_->offset(), capacity);
// Clear current span to avoid warning about dangling pointer, as
// SetCapacity() may destroy the old buffer.
ClearSpan();
base_->SetCapacity(capacity);
SetSpan(base_->span());
}
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=" << base_->offset();
return false;
}
int new_capacity = GetCapacity() * kCapacityIncreaseFactor;
if (new_capacity > max_buffer_size_)
new_capacity = max_buffer_size_;
SetCapacity(new_capacity);
return true;
}
base::span<const uint8_t> HttpConnection::ReadIOBuffer::readable_bytes() const {
return base_->span_before_offset();
}
void HttpConnection::ReadIOBuffer::DidRead(int bytes) {
DCHECK_GE(RemainingCapacity(), bytes);
base_->set_offset(base_->offset() + bytes);
SetSpan(base_->span());
}
int HttpConnection::ReadIOBuffer::RemainingCapacity() const {
return base_->RemainingCapacity();
}
void HttpConnection::ReadIOBuffer::DidConsume(int bytes) {
int previous_size = base_->offset();
int unconsumed_size = previous_size - bytes;
DCHECK_LE(0, unconsumed_size);
if (unconsumed_size > 0) {
// Move unconsumed data to the start of buffer. readable_bytes() returns a
// read-only buffer, so need to call the non-constant overload in the base
// class instead, to get a writeable span.
base::span<uint8_t> buffer = base_->span_before_offset();
std::ranges::copy(buffer.subspan(base::checked_cast<size_t>(bytes)),
buffer.begin());
}
base_->set_offset(unconsumed_size);
SetSpan(base_->span());
// 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.
ClearSpan();
// 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() {
// `pending_data_` owns the underlying data.
ClearSpan();
}
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) {
SetSpan(base::as_writable_bytes(base::span(*pending_data_.front())));
}
return true;
}
void HttpConnection::QueuedWriteIOBuffer::DidConsume(int size) {
DCHECK_GE(total_size_, size);
DCHECK_GE(GetSizeToWrite(), size);
if (size == 0)
return;
if (size < GetSizeToWrite()) {
SetSpan(span().subspan(base::checked_cast<size_t>(size)));
} else {
// size == GetSizeToWrite(). Updates data_ to next pending data.
ClearSpan();
pending_data_.pop();
if (!IsEmpty()) {
SetSpan(base::as_writable_bytes(base::span(*pending_data_.front())));
}
}
total_size_ -= size;
}
int HttpConnection::QueuedWriteIOBuffer::GetSizeToWrite() const {
if (IsEmpty()) {
DCHECK_EQ(0, total_size_);
return 0;
}
// Return the unconsumed size of the current pending write.
return size();
}
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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