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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_METRICS_EXPIRED_HISTOGRAMS_CHECKER_H_
#define COMPONENTS_METRICS_EXPIRED_HISTOGRAMS_CHECKER_H_
#include <stdint.h>
#include <set>
#include "base/containers/span.h"
#include "base/memory/raw_span.h"
#include "base/metrics/record_histogram_checker.h"
namespace metrics {
// ExpiredHistogramsChecker implements RecordHistogramChecker interface
// to avoid recording expired metrics.
class ExpiredHistogramsChecker final : public base::RecordHistogramChecker {
public:
// Takes a sorted array of histogram hashes in ascending order and a
// list of explicitly allowed histogram names as a comma-separated string.
// Histograms in the |allowlist_str| are logged even if their hash is in the
// |expired_histograms_hashes|.
ExpiredHistogramsChecker(base::span<const uint32_t> expired_histogram_hashes,
const std::string& allowlist_str);
ExpiredHistogramsChecker(const ExpiredHistogramsChecker&) = delete;
ExpiredHistogramsChecker& operator=(const ExpiredHistogramsChecker&) = delete;
~ExpiredHistogramsChecker() override;
// Checks if the given |histogram_hash| corresponds to an expired histogram.
bool ShouldRecord(uint32_t histogram_hash) const override;
private:
// Initializes the |allowlist_| array of histogram hashes that should be
// recorded regardless of their expiration.
void InitAllowlist(const std::string& allowlist_str);
// Array of expired histogram hashes.
const base::raw_span<const uint32_t> expired_histogram_hashes_;
// Set of expired histogram hashes that should be recorded.
std::set<uint32_t> allowlist_;
};
} // namespace metrics
#endif // COMPONENTS_METRICS_EXPIRED_HISTOGRAMS_CHECKER_H_
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