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content / browser / interest_group / noiser_and_bucketer.cc [blame]
// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/interest_group/noiser_and_bucketer.h"
#include <stdint.h>
#include "base/rand_util.h"
#include "base/time/time.h"
namespace content {
namespace {
template <typename T>
T Noise(T input, int min, int max) {
if (base::RandDouble() < 0.01) {
return static_cast<T>(base::RandInt(min, max));
}
return input;
}
} // namespace
uint8_t NoiseAndBucketJoinCount(int32_t join_count) {
return Noise(internals::BucketJoinCount(join_count), 1, 16);
}
uint8_t NoiseAndBucketRecency(base::TimeDelta recency) {
return Noise(internals::BucketRecency(recency), 0, 31);
}
uint16_t NoiseAndMaskModelingSignals(uint16_t modeling_signals) {
constexpr uint16_t kMask = 0x0FFF;
return Noise(modeling_signals & kMask, 0, kMask);
}
namespace internals {
uint8_t BucketJoinCount(int32_t join_count) {
if (join_count < 1) {
join_count = 1;
}
if (join_count <= 10) {
return join_count;
} else if (join_count <= 20) {
return 11;
} else if (join_count <= 30) {
return 12;
} else if (join_count <= 40) {
return 13;
} else if (join_count <= 50) {
return 14;
} else if (join_count <= 100) {
return 15;
}
return 16;
}
uint8_t BucketRecency(base::TimeDelta recency) {
if (recency < base::Minutes(0)) {
recency = base::Minutes(0);
}
if (recency < base::Minutes(10)) {
return recency.InMinutes();
} else if (recency < base::Minutes(15)) {
return 10;
} else if (recency < base::Minutes(20)) {
return 11;
} else if (recency < base::Minutes(30)) {
return 12;
} else if (recency < base::Minutes(40)) {
return 13;
} else if (recency < base::Minutes(50)) {
return 14;
} else if (recency < base::Minutes(60)) {
return 15;
} else if (recency < base::Minutes(75)) {
return 16;
} else if (recency < base::Minutes(90)) {
return 17;
} else if (recency < base::Minutes(105)) {
return 18;
} else if (recency < base::Minutes(120)) {
return 19;
} else if (recency < base::Minutes(240)) {
return 20;
} else if (recency < base::Minutes(720)) {
return 21;
} else if (recency < base::Minutes(1440)) {
return 22;
} else if (recency < base::Minutes(2160)) {
return 23;
} else if (recency < base::Minutes(2880)) {
return 24;
} else if (recency < base::Minutes(4320)) {
return 25;
} else if (recency < base::Minutes(5760)) {
return 26;
} else if (recency < base::Minutes(10080)) {
return 27;
} else if (recency < base::Minutes(20160)) {
return 28;
} else if (recency < base::Minutes(30240)) {
return 29;
} else if (recency < base::Minutes(40320)) {
return 30;
}
return 31;
}
} // namespace internals
} // namespace content