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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.
#ifndef CHROME_BROWSER_NET_DNS_PROBE_SERVICE_H_
#define CHROME_BROWSER_NET_DNS_PROBE_SERVICE_H_
#include <vector>
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/time.h"
#include "chrome/browser/net/dns_probe_job.h"
#include "chrome/common/net/net_error_info.h"
#include "net/base/network_change_notifier.h"
namespace net {
struct DnsConfig;
}
namespace chrome_browser_net {
class DnsProbeService : public net::NetworkChangeNotifier::IPAddressObserver {
public:
typedef base::Callback<void(chrome_common_net::DnsProbeResult result)>
CallbackType;
DnsProbeService();
virtual ~DnsProbeService();
void ProbeDns(const CallbackType& callback);
// NetworkChangeNotifier::IPAddressObserver implementation:
virtual void OnIPAddressChanged() OVERRIDE;
protected:
// This can be called by tests to pretend the cached reuslt has expired.
void ExpireResults();
private:
enum State {
STATE_NO_RESULTS,
STATE_PROBE_RUNNING,
STATE_RESULTS_CACHED,
};
void StartProbes();
void OnProbesComplete();
void CallCallbacks();
void OnProbeJobComplete(DnsProbeJob* job, DnsProbeJob::Result result);
chrome_common_net::DnsProbeResult EvaluateResults() const;
void HistogramProbes() const;
// These are expected to be overridden by tests to return mock jobs.
virtual scoped_ptr<DnsProbeJob> CreateSystemProbeJob(
const DnsProbeJob::CallbackType& job_callback);
virtual scoped_ptr<DnsProbeJob> CreatePublicProbeJob(
const DnsProbeJob::CallbackType& job_callback);
scoped_ptr<DnsProbeJob> CreateProbeJob(
const net::DnsConfig& dns_config,
const DnsProbeJob::CallbackType& job_callback);
void GetSystemDnsConfig(net::DnsConfig* config);
void GetPublicDnsConfig(net::DnsConfig* config);
bool ResultsExpired();
scoped_ptr<DnsProbeJob> system_job_;
scoped_ptr<DnsProbeJob> public_job_;
DnsProbeJob::Result system_result_;
DnsProbeJob::Result public_result_;
std::vector<CallbackType> callbacks_;
State state_;
chrome_common_net::DnsProbeResult result_;
base::Time probe_start_time_;
// How many DNS request attempts the probe jobs will make before giving up
// (Overrides the attempts field in the system DnsConfig.)
const int dns_attempts_;
// How many nameservers the system config has.
int system_nameserver_count_;
// Whether the only system nameserver is 127.0.0.1.
bool system_is_localhost_;
DISALLOW_COPY_AND_ASSIGN(DnsProbeService);
};
} // namespace chrome_browser_net
#endif // CHROME_BROWSER_NET_DNS_PROBE_SERVICE_H_
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