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