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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.
#include "components/metrics/expired_histograms_checker.h"
#include <algorithm>
#include <string_view>
#include <vector>
#include "base/containers/contains.h"
#include "base/memory/raw_ptr.h"
#include "base/metrics/metrics_hashes.h"
#include "base/metrics/statistics_recorder.h"
#include "base/strings/string_split.h"
namespace metrics {
ExpiredHistogramsChecker::ExpiredHistogramsChecker(
base::span<const uint32_t> expired_histogram_hashes,
const std::string& allowlist_str)
: expired_histogram_hashes_(expired_histogram_hashes) {
InitAllowlist(allowlist_str);
}
ExpiredHistogramsChecker::~ExpiredHistogramsChecker() = default;
bool ExpiredHistogramsChecker::ShouldRecord(uint32_t histogram_hash) const {
// If histogram is explicitly allowed then it should always be recorded.
if (base::Contains(allowlist_, histogram_hash)) {
return true;
}
return !std::binary_search(std::begin(expired_histogram_hashes_),
std::end(expired_histogram_hashes_),
histogram_hash);
}
void ExpiredHistogramsChecker::InitAllowlist(const std::string& allowlist_str) {
std::vector<std::string_view> allowlist_names = base::SplitStringPiece(
allowlist_str, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
for (std::string_view name : allowlist_names) {
allowlist_.insert(base::HashMetricNameAs32Bits(name));
}
}
} // namespace metrics
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