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// Copyright 2020 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/feed/core/v2/scheduling.h"
#include "base/json/values_util.h"
#include "base/time/time.h"
#include "base/types/cxx23_to_underlying.h"
#include "base/values.h"
#include "components/feed/core/v2/config.h"
#include "components/feed/core/v2/feedstore_util.h"
#include "components/feed/feed_feature_list.h"
namespace feed {
namespace {
base::Value::List VectorToList(const std::vector<base::TimeDelta>& values) {
base::Value::List result;
for (base::TimeDelta delta : values) {
result.Append(base::TimeDeltaToValue(delta));
}
return result;
}
bool ListToVector(const base::Value::List& value,
std::vector<base::TimeDelta>* result) {
for (const base::Value& entry : value) {
std::optional<base::TimeDelta> delta = base::ValueToTimeDelta(entry);
if (!delta)
return false;
result->push_back(*delta);
}
return true;
}
base::TimeDelta GetThresholdTime(base::TimeDelta default_threshold,
base::TimeDelta server_threshold) {
if (server_threshold <= base::TimeDelta() ||
server_threshold > default_threshold) {
return default_threshold;
}
return server_threshold;
}
RequestSchedule::Type GetScheduleType(const base::Value* value) {
if (value && value->is_int()) {
int int_value = value->GetInt();
if (int_value >= 0 &&
int_value <= base::to_underlying(RequestSchedule::Type::kMaxValue)) {
return static_cast<RequestSchedule::Type>(int_value);
}
}
return RequestSchedule::Type::kScheduledRefresh;
}
} // namespace
RequestSchedule::RequestSchedule() = default;
RequestSchedule::~RequestSchedule() = default;
RequestSchedule::RequestSchedule(const RequestSchedule&) = default;
RequestSchedule& RequestSchedule::operator=(const RequestSchedule&) = default;
RequestSchedule::RequestSchedule(RequestSchedule&&) = default;
RequestSchedule& RequestSchedule::operator=(RequestSchedule&&) = default;
base::Value::Dict RequestScheduleToDict(const RequestSchedule& schedule) {
base::Value::Dict result;
result.Set("anchor", base::TimeToValue(schedule.anchor_time));
result.Set("offsets", VectorToList(schedule.refresh_offsets));
result.Set("type", base::to_underlying(schedule.type));
return result;
}
RequestSchedule RequestScheduleFromDict(const base::Value::Dict& value) {
RequestSchedule result;
std::optional<base::Time> anchor = base::ValueToTime(value.Find("anchor"));
const base::Value::List* offsets = value.FindList("offsets");
result.type = GetScheduleType(value.Find("type"));
if (!anchor || !offsets || !ListToVector(*offsets, &result.refresh_offsets))
return {};
result.anchor_time = *anchor;
return result;
}
base::Time NextScheduledRequestTime(base::Time now, RequestSchedule* schedule) {
if (schedule->refresh_offsets.empty())
return now + GetFeedConfig().default_background_refresh_interval;
// Attempt to detect system clock changes. If |anchor_time| is in the future,
// or too far in the past, we reset |anchor_time| to now.
if (now < schedule->anchor_time ||
schedule->anchor_time + base::Days(7) < now) {
schedule->anchor_time = now;
}
while (!schedule->refresh_offsets.empty()) {
base::Time request_time =
schedule->anchor_time + schedule->refresh_offsets[0];
if (request_time <= now) {
// The schedule time is in the past. This can happen if the scheduled
// request already ran, or if the scheduled task was missed. Just ignore
// this fetch so that we don't risk multiple fetches at a time.
schedule->refresh_offsets.erase(schedule->refresh_offsets.begin());
continue;
}
return request_time;
}
return now + GetFeedConfig().default_background_refresh_interval;
}
bool ShouldWaitForNewContent(const feedstore::Metadata& metadata,
const StreamType& stream_type,
base::TimeDelta content_age,
bool is_web_feed_subscriber) {
const feedstore::Metadata::StreamMetadata* stream_metadata =
feedstore::FindMetadataForStream(metadata, stream_type);
if (stream_metadata && stream_metadata->is_known_stale())
return true;
base::TimeDelta staleness_threshold = GetFeedConfig().GetStalenessThreshold(
stream_type, is_web_feed_subscriber);
if (stream_metadata && stream_metadata->has_content_lifetime()) {
staleness_threshold = GetThresholdTime(
staleness_threshold,
base::Milliseconds(stream_metadata->content_lifetime().stale_age_ms()));
}
return content_age > staleness_threshold;
}
bool ContentInvalidFromAge(const feedstore::Metadata& metadata,
const StreamType& stream_type,
base::TimeDelta content_age,
bool is_web_feed_subscriber) {
const feedstore::Metadata::StreamMetadata* stream_metadata =
feedstore::FindMetadataForStream(metadata, stream_type);
base::TimeDelta content_expiration_threshold =
GetFeedConfig().content_expiration_threshold;
if (base::FeatureList::IsEnabled(kWebFeedOnboarding) &&
!is_web_feed_subscriber && stream_type.IsWebFeed()) {
content_expiration_threshold =
GetFeedConfig().subscriptionless_content_expiration_threshold;
}
if (stream_metadata && stream_metadata->has_content_lifetime()) {
content_expiration_threshold = GetThresholdTime(
content_expiration_threshold,
base::Milliseconds(
stream_metadata->content_lifetime().invalid_age_ms()));
}
return content_age > content_expiration_threshold;
}
} // namespace feed
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