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// Copyright (c) 2012 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 "net/dns/dns_session.h"
#include <stdint.h>
#include <limits>
#include <utility>
#include "base/bind.h"
#include "base/macros.h"
#include "base/metrics/histogram_macros.h"
#include "base/rand_util.h"
#include "base/stl_util.h"
#include "net/base/ip_endpoint.h"
#include "net/base/net_errors.h"
#include "net/dns/dns_config.h"
#include "net/dns/dns_socket_pool.h"
#include "net/log/net_log_event_type.h"
#include "net/log/net_log_source.h"
#include "net/log/net_log_with_source.h"
#include "net/socket/datagram_client_socket.h"
#include "net/socket/stream_socket.h"
namespace net {
DnsSession::SocketLease::SocketLease(
scoped_refptr<DnsSession> session,
size_t server_index,
std::unique_ptr<DatagramClientSocket> socket)
: session_(session),
server_index_(server_index),
socket_(std::move(socket)) {}
DnsSession::SocketLease::~SocketLease() {
session_->FreeSocket(server_index_, std::move(socket_));
}
DnsSession::DnsSession(const DnsConfig& config,
std::unique_ptr<DnsSocketPool> socket_pool,
const RandIntCallback& rand_int_callback,
NetLog* net_log)
: config_(config),
socket_pool_(std::move(socket_pool)),
rand_callback_(base::BindRepeating(rand_int_callback,
0,
std::numeric_limits<uint16_t>::max())),
net_log_(net_log) {
socket_pool_->Initialize(&config_.nameservers, net_log);
UMA_HISTOGRAM_CUSTOM_COUNTS("AsyncDNS.ServerCount",
config_.nameservers.size(), 1, 10, 11);
}
DnsSession::~DnsSession() = default;
uint16_t DnsSession::NextQueryId() const {
return static_cast<uint16_t>(rand_callback_.Run());
}
// Allocate a socket, already connected to the server address.
std::unique_ptr<DnsSession::SocketLease> DnsSession::AllocateSocket(
size_t server_index,
const NetLogSource& source) {
std::unique_ptr<DatagramClientSocket> socket;
socket = socket_pool_->AllocateSocket(server_index);
if (!socket.get())
return std::unique_ptr<SocketLease>();
socket->NetLog().BeginEventReferencingSource(NetLogEventType::SOCKET_IN_USE,
source);
SocketLease* lease = new SocketLease(this, server_index, std::move(socket));
return std::unique_ptr<SocketLease>(lease);
}
std::unique_ptr<StreamSocket> DnsSession::CreateTCPSocket(
size_t server_index,
const NetLogSource& source) {
return socket_pool_->CreateTCPSocket(server_index, source);
}
void DnsSession::InvalidateWeakPtrsForTesting() {
weak_ptr_factory_.InvalidateWeakPtrs();
}
// Release a socket.
void DnsSession::FreeSocket(size_t server_index,
std::unique_ptr<DatagramClientSocket> socket) {
DCHECK(socket.get());
socket->NetLog().EndEvent(NetLogEventType::SOCKET_IN_USE);
socket_pool_->FreeSocket(server_index, std::move(socket));
}
} // namespace net
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