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// 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 "chrome/browser/ssl/daily_navigation_counter.h"
#include "base/i18n/time_formatting.h"
#include "base/time/clock.h"
#include "third_party/icu/source/i18n/unicode/timezone.h"
namespace {
// Returns the given time in yyyy-MM-dd format.
std::string GetDateString(base::Time now) {
return base::UnlocalizedTimeFormatWithPattern(now.UTCMidnight(), "yyyy-MM-dd",
icu::TimeZone::getGMT());
}
} // namespace
DailyNavigationCounter::DailyNavigationCounter(
base::Value::Dict* dict,
base::Clock* clock,
size_t rolling_window_duration_in_days,
size_t save_interval)
: dict_(dict),
clock_(clock),
rolling_window_duration_in_days_(rolling_window_duration_in_days),
save_interval_(save_interval) {
DCHECK(save_interval_ > 0);
// Load from the saved dict into the current map, discarding old entries.
base::Time now = clock_->Now();
base::Time cutoff =
now.UTCMidnight() - base::Days(rolling_window_duration_in_days_);
for (auto [key, value] : *dict_) {
base::Time timestamp;
if (!base::Time::FromUTCString(key.c_str(), ×tamp)) {
// Not a valid bucket.
continue;
}
if (timestamp < cutoff) {
// Old bucket.
continue;
}
std::optional<int> count = dict->FindInt(key);
if (!count.has_value()) {
continue;
}
counts_map_[key] = count.value();
}
}
DailyNavigationCounter::~DailyNavigationCounter() = default;
size_t DailyNavigationCounter::GetTotal() const {
size_t total = 0;
for (auto [key, value] : counts_map_) {
total += value;
}
return total;
}
bool DailyNavigationCounter::Increment() {
base::Time now = clock_->Now();
std::string today = GetDateString(now);
counts_map_[today]++;
unsaved_count_++;
if (unsaved_count_ < save_interval_) {
// Not stale.
return false;
}
// Otherwise, discard old buckets and save the current map to the backing
// dict.
base::Time cutoff =
now.UTCMidnight() - base::Days(rolling_window_duration_in_days_);
base::flat_map<std::string, int> new_map_;
dict_->clear();
for (auto [key, value] : counts_map_) {
base::Time timestamp;
if (!base::Time::FromUTCString(key.c_str(), ×tamp)) {
// Not a valid bucket.
continue;
}
if (timestamp < cutoff) {
// Old bucket.
continue;
}
new_map_[key] = value;
dict_->Set(key, value);
}
counts_map_ = new_map_;
unsaved_count_ = 0;
return true;
}
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