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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 "components/segmentation_platform/internal/database/cached_result_writer.h"
#include "base/logging.h"
#include "base/time/time.h"
#include "components/segmentation_platform/internal/logging.h"
#include "components/segmentation_platform/internal/metadata/metadata_utils.h"
#include "components/segmentation_platform/internal/post_processor/post_processor.h"
#include "components/segmentation_platform/internal/stats.h"
#include "components/segmentation_platform/public/config.h"
namespace segmentation_platform {
CachedResultWriter::CachedResultWriter(ClientResultPrefs* prefs,
base::Clock* clock)
: result_prefs_(prefs), clock_(clock) {}
CachedResultWriter::~CachedResultWriter() = default;
bool CachedResultWriter::UpdatePrefsIfExpired(
const Config* config,
proto::ClientResult client_result,
const PlatformOptions& platform_options) {
if (!IsPrefUpdateRequiredForClient(config, client_result, platform_options)) {
return false;
}
VLOG(1) << "CachedResultWriter updating prefs with new result: "
<< segmentation_platform::PredictionResultToDebugString(
client_result.client_result())
<< " for segmentation key: " << config->segmentation_key;
UpdateNewClientResultToPrefs(config, std::move(client_result));
return true;
}
void CachedResultWriter::MarkResultAsUsed(const Config* config) {
const proto::ClientResult* old_result =
result_prefs_->ReadClientResultFromPrefs(config->segmentation_key);
if (!old_result || old_result->first_used_timestamp() > 0) {
return;
}
proto::ClientResult new_result = *old_result;
new_result.set_first_used_timestamp(
base::Time::Now().ToDeltaSinceWindowsEpoch().InMicroseconds());
result_prefs_->SaveClientResultToPrefs(config->segmentation_key,
std::move(new_result));
}
void CachedResultWriter::CacheModelExecution(
const Config* config,
const proto::PredictionResult& result) {
auto now = base::Time::Now();
proto::ClientResult update =
metadata_utils::CreateClientResultFromPredResult(result, now);
update.set_first_used_timestamp(
now.ToDeltaSinceWindowsEpoch().InMicroseconds());
result_prefs_->SaveClientResultToPrefs(config->segmentation_key, update);
}
bool CachedResultWriter::IsPrefUpdateRequiredForClient(
const Config* config,
const proto::ClientResult& new_client_result,
const PlatformOptions& platform_options) {
const proto::ClientResult* old_client_result =
result_prefs_->ReadClientResultFromPrefs(config->segmentation_key);
if (!old_client_result) {
return true;
}
const proto::PredictionResult& old_pred_result =
old_client_result->client_result();
const proto::PredictionResult& new_pred_result =
new_client_result.client_result();
// When migrating from legacy, `model_version` would be missing. We consider
// model is updated, if old model version is missing or if new model version
// is greater than old model version. We also assume model_version is always
// increasing monotonically.
bool is_model_updated =
new_pred_result.has_model_version() &&
(!old_pred_result.has_model_version() ||
(old_pred_result.has_model_version() &&
old_pred_result.model_version() < new_pred_result.model_version()));
if (is_model_updated &&
new_pred_result.output_config().ignore_previous_model_ttl()) {
return true;
}
PostProcessor post_processor;
base::TimeDelta ttl_to_use =
post_processor.GetTTLForPredictedResult(old_pred_result);
base::Time expiration_time =
base::Time::FromDeltaSinceWindowsEpoch(
base::Microseconds(old_client_result->timestamp_us())) +
ttl_to_use;
bool force_refresh_results = platform_options.force_refresh_results;
bool has_expired_results = expiration_time <= clock_->Now();
if (!force_refresh_results && !has_expired_results) {
stats::RecordSegmentSelectionFailure(
*config, stats::SegmentationSelectionFailureReason::
kProtoPrefsUpdateNotRequired);
VLOG(1) << __func__ << ": previous client_result for segmentation_key: "
<< config->segmentation_key
<< " has not yet expired. Expiration: " << expiration_time;
return false;
}
return true;
}
void CachedResultWriter::UpdateNewClientResultToPrefs(
const Config* config,
proto::ClientResult client_result) {
const proto::ClientResult* prev_client_result =
result_prefs_->ReadClientResultFromPrefs(config->segmentation_key);
const proto::PredictionResult* prev_prediction_result =
prev_client_result ? &prev_client_result->client_result() : nullptr;
if (prev_prediction_result &&
PostProcessor::IsClassificationResult(*prev_prediction_result) &&
PostProcessor::IsClassificationResult(client_result.client_result())) {
stats::RecordClassificationResultUpdated(*config, prev_prediction_result,
client_result.client_result());
}
stats::RecordSegmentSelectionFailure(
*config, stats::SegmentationSelectionFailureReason::kProtoPrefsUpdated);
result_prefs_->SaveClientResultToPrefs(config->segmentation_key,
std::move(client_result));
}
} // namespace segmentation_platform
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