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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 "base/basictypes.h"
#include "base/bind.h"
#include "base/time.h"
#include "net/base/ip_endpoint.h"
#include "net/dns/dns_config_service.h"
#include "net/socket/client_socket_factory.h"
namespace net {
DnsSession::DnsSession(const DnsConfig& config,
ClientSocketFactory* factory,
const RandIntCallback& rand_int_callback,
NetLog* net_log)
: config_(config),
socket_factory_(factory),
rand_callback_(base::Bind(rand_int_callback, 0, kuint16max)),
net_log_(net_log),
server_index_(0) {
}
int DnsSession::NextQueryId() const {
return rand_callback_.Run();
}
int DnsSession::NextFirstServerIndex() {
int index = server_index_;
if (config_.rotate)
server_index_ = (server_index_ + 1) % config_.nameservers.size();
return index;
}
base::TimeDelta DnsSession::NextTimeout(int attempt) {
// The timeout doubles every full round (each nameserver once).
// TODO(szym): Adapt timeout to observed RTT. http://crbug.com/110197
return config_.timeout * (1 << (attempt / config_.nameservers.size()));
}
DnsSession::~DnsSession() {}
} // namespace net
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