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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.
#ifndef CHROME_BROWSER_NET_DNS_PROBE_SERVICE_H_
#define CHROME_BROWSER_NET_DNS_PROBE_SERVICE_H_
#include "base/functional/callback.h"
#include "components/error_page/common/net_error_info.h"
#include "components/keyed_service/core/keyed_service.h"
#include "net/dns/public/dns_config_overrides.h"
namespace chrome_browser_net {
// Probes the current DNS config servers and Google DNS servers to determine
// the (probable) cause of a recent DNS-related page load error. Coalesces
// multiple probe requests (perhaps from multiple tabs) and caches the results.
//
// Uses a single DNS attempt per config, and doesn't randomize source ports.
//
// Use DnsProbeServiceFactory to get a service handle.
class DnsProbeService : public KeyedService {
public:
using ProbeCallback =
base::OnceCallback<void(error_page::DnsProbeStatus result)>;
// Starts a DNS probe, or uses an existing probe result if a probe is already
// in progress or recently completed. |callback| will be called
// asynchronously with the probe result.
virtual void ProbeDns(ProbeCallback callback) = 0;
// Returns the DnsConfigOverrides being used to mimic the current DNS config.
virtual net::DnsConfigOverrides GetCurrentConfigOverridesForTesting() = 0;
};
} // namespace chrome_browser_net
#endif // CHROME_BROWSER_NET_DNS_PROBE_SERVICE_H_
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