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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_DNS_HTTPSSVC_METRICS_H_
#define NET_DNS_HTTPSSVC_METRICS_H_
#include <string>
#include <vector>
#include "base/containers/flat_set.h"
#include "base/strings/string_piece.h"
#include "base/time/time.h"
#include "net/base/net_export.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
namespace net {
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused. (See HttpssvcDnsRcode in
// tools/metrics/histograms/enums.xml.)
enum HttpssvcDnsRcode {
kTimedOut = 0,
kUnrecognizedRcode,
kMissingDnsResponse,
kNoError,
kFormErr,
kServFail,
kNxDomain,
kNotImp,
kRefused,
kMaxValue = kRefused,
};
// Translate an RCODE value to the |HttpssvcDnsRcode| enum, which is used for
// HTTPSSVC experimentation. The goal is to keep these values in a small,
// contiguous range in order to satisfy the UMA enumeration function's
// requirements. This function never returns |kTimedOut| |kUnrecognizedRcode|,
// or |kMissingDnsResponse|.
enum HttpssvcDnsRcode TranslateDnsRcodeForHttpssvcExperiment(uint8_t rcode);
// Tool for aggregating HTTPS RR metrics. Accumulates metrics via the Save*
// methods. Records metrics to UMA on destruction.
// TODO(crbug.com/1366422): Rework this class once we've finished with
// HTTPS-related rollouts and have decided what metrics we want to keep
// permanently.
class NET_EXPORT_PRIVATE HttpssvcMetrics {
public:
explicit HttpssvcMetrics(bool secure);
~HttpssvcMetrics();
HttpssvcMetrics(HttpssvcMetrics&) = delete;
HttpssvcMetrics(HttpssvcMetrics&&) = delete;
// May be called many times.
void SaveForAddressQuery(base::TimeDelta resolve_time,
enum HttpssvcDnsRcode rcode);
// Save the fact that the non-integrity queries failed. Prevents metrics from
// being recorded.
void SaveAddressQueryFailure();
// Must only be called once.
void SaveForHttps(enum HttpssvcDnsRcode rcode,
const std::vector<bool>& condensed_records,
base::TimeDelta https_resolve_time);
private:
std::string BuildMetricName(base::StringPiece leaf_name) const;
// Records all the aggregated metrics to UMA.
void RecordMetrics();
const bool secure_;
// RecordIntegrityMetrics() will do nothing when |disqualified_| is true.
bool disqualified_ = false;
bool already_recorded_ = false;
absl::optional<enum HttpssvcDnsRcode> rcode_https_;
size_t num_https_records_ = 0;
absl::optional<bool> is_https_parsable_;
// We never make multiple HTTPS queries per DnsTask, so we only need
// one TimeDelta for the HTTPS query.
absl::optional<base::TimeDelta> https_resolve_time_;
std::vector<base::TimeDelta> address_resolve_times_;
};
} // namespace net
#endif // NET_DNS_HTTPSSVC_METRICS_H_
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