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// Copyright 2024 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/affiliations/core/browser/affiliation_prefetcher.h"
#include <algorithm>
#include <optional>
#include <utility>
#include "base/barrier_callback.h"
#include "base/check_op.h"
#include "base/functional/bind.h"
#include "base/task/sequenced_task_runner.h"
#include "components/affiliations/core/browser/affiliation_service.h"
#include "components/affiliations/core/browser/affiliation_utils.h"
namespace affiliations {
namespace {
using affiliations::FacetURI;
// I/O heavy initialization on start-up will be delayed by this long.
// This should be high enough not to exacerbate start-up I/O contention too
// much, but also low enough so important affiliations data is quickly available
// to the user (e.g. log into websites using Android credentials).
constexpr base::TimeDelta kInitializationDelayOnStartup = base::Seconds(30);
} // namespace
AffiliationPrefetcher::AffiliationPrefetcher(
AffiliationService* affiliation_service)
: affiliation_service_(affiliation_service) {
base::SequencedTaskRunner::GetCurrentDefault()->PostDelayedTask(
FROM_HERE,
base::BindOnce(&AffiliationPrefetcher::Initialize,
weak_ptr_factory_.GetWeakPtr()),
kInitializationDelayOnStartup);
}
AffiliationPrefetcher::~AffiliationPrefetcher() = default;
void AffiliationPrefetcher::RegisterSource(
std::unique_ptr<AffiliationSource> source) {
CHECK(source);
pending_initializations_.push_back(std::move(source));
// If initialization had already happened, request facets from all sources
// again to ensure the affiliations cache gets properly updated, otherwise
// do nothing.
if (is_ready_) {
// TODO(b/328037758): Avoid reinitializing for late registered sources and
// directly fetch their affiliations. Include metrics to understand how
// often does this happen.
Initialize();
}
}
void AffiliationPrefetcher::OnFacetsAdded(std::vector<FacetURI> facets) {
for (const FacetURI& facet_uri : facets) {
if (facet_uri.is_valid()) {
affiliation_service_->Prefetch(facet_uri, base::Time::Max());
}
}
}
void AffiliationPrefetcher::OnFacetsRemoved(std::vector<FacetURI> facets) {
for (const FacetURI& facet_uri : facets) {
if (facet_uri.is_valid()) {
affiliation_service_->CancelPrefetch(facet_uri, base::Time::Max());
}
}
}
void AffiliationPrefetcher::OnResultFromSingleSourceReceived(
std::vector<FacetURI> results) {
DCHECK(on_facets_received_barrier_callback_);
on_facets_received_barrier_callback_.Run(std::move(results));
}
void AffiliationPrefetcher::OnResultFromAllSourcesReceived(
std::vector<std::vector<FacetURI>> results) {
// If any source is registered while awaiting for results from already
// initialized sources, initialize again to account for newly added sources.
if (!pending_initializations_.empty()) {
Initialize();
return;
}
std::vector<FacetURI> facets;
for (const auto& result_per_source : results) {
for (const FacetURI& facet_uri : result_per_source) {
if (facet_uri.is_valid()) {
facets.push_back(std::move(facet_uri));
}
}
}
affiliation_service_->KeepPrefetchForFacets(facets);
affiliation_service_->TrimUnusedCache(std::move(facets));
is_ready_ = true;
}
void AffiliationPrefetcher::Initialize() {
if (pending_initializations_.empty()) {
// Reset the cache if no sources have been registered.
DCHECK(initialized_sources_.empty());
affiliation_service_->KeepPrefetchForFacets({});
affiliation_service_->TrimUnusedCache({});
is_ready_ = true;
return;
}
is_ready_ = false;
for (std::unique_ptr<AffiliationSource>& source : pending_initializations_) {
source->StartObserving(this);
initialized_sources_.push_back(std::move(source));
}
pending_initializations_.clear();
on_facets_received_barrier_callback_ =
base::BarrierCallback<std::vector<FacetURI>>(
initialized_sources_.size(),
base::BindOnce(&AffiliationPrefetcher::OnResultFromAllSourcesReceived,
weak_ptr_factory_.GetWeakPtr()));
for (const std::unique_ptr<AffiliationSource>& source :
initialized_sources_) {
source->GetFacets(
base::BindOnce(&AffiliationPrefetcher::OnResultFromSingleSourceReceived,
weak_ptr_factory_.GetWeakPtr()));
}
}
} // namespace affiliations
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