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// Copyright 2013 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/dom_distiller/core/dom_distiller_service.h"
#include <algorithm>
#include <memory>
#include <utility>
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/task/single_thread_task_runner.h"
#include "base/uuid.h"
#include "components/dom_distiller/core/distilled_content_store.h"
#include "components/dom_distiller/core/proto/distilled_article.pb.h"
#include "components/dom_distiller/core/task_tracker.h"
#include "url/gurl.h"
namespace dom_distiller {
namespace {
ArticleEntry CreateSkeletonEntryForUrl(const GURL& url) {
ArticleEntry skeleton;
skeleton.entry_id = base::Uuid::GenerateRandomV4().AsLowercaseString();
skeleton.pages.push_back(url);
DCHECK(IsEntryValid(skeleton));
return skeleton;
}
} // namespace
DomDistillerService::DomDistillerService(
std::unique_ptr<DistillerFactory> distiller_factory,
std::unique_ptr<DistillerPageFactory> distiller_page_factory,
std::unique_ptr<DistilledPagePrefs> distilled_page_prefs,
std::unique_ptr<DistillerUIHandle> distiller_ui_handle)
: content_store_(new InMemoryContentStore(kDefaultMaxNumCachedEntries)),
distiller_factory_(std::move(distiller_factory)),
distiller_page_factory_(std::move(distiller_page_factory)),
distilled_page_prefs_(std::move(distilled_page_prefs)),
distiller_ui_handle_(std::move(distiller_ui_handle)),
weak_ptr_factory_(this) {}
DomDistillerService::~DomDistillerService() {
// There shouldn't be any tasks pending at this point.
DCHECK(tasks_.empty());
}
std::unique_ptr<DistillerPage> DomDistillerService::CreateDefaultDistillerPage(
const gfx::Size& render_view_size) {
return distiller_page_factory_->CreateDistillerPage(render_view_size);
}
std::unique_ptr<DistillerPage>
DomDistillerService::CreateDefaultDistillerPageWithHandle(
std::unique_ptr<SourcePageHandle> handle) {
return distiller_page_factory_->CreateDistillerPageWithHandle(
std::move(handle));
}
std::unique_ptr<ViewerHandle> DomDistillerService::ViewUrl(
ViewRequestDelegate* delegate,
std::unique_ptr<DistillerPage> distiller_page,
const GURL& url) {
if (!url.is_valid()) {
return nullptr;
}
TaskTracker* task_tracker = nullptr;
bool was_created = GetOrCreateTaskTrackerForUrl(url, &task_tracker);
std::unique_ptr<ViewerHandle> viewer_handle =
task_tracker->AddViewer(delegate);
// If a distiller is already running for one URL, don't start another.
if (was_created) {
task_tracker->StartDistiller(distiller_factory_.get(),
std::move(distiller_page));
task_tracker->StartBlobFetcher();
}
return viewer_handle;
}
bool DomDistillerService::GetOrCreateTaskTrackerForUrl(
const GURL& url,
TaskTracker** task_tracker) {
*task_tracker = GetTaskTrackerForUrl(url);
if (*task_tracker) {
return false;
}
ArticleEntry skeleton_entry = CreateSkeletonEntryForUrl(url);
*task_tracker = CreateTaskTracker(skeleton_entry);
return true;
}
TaskTracker* DomDistillerService::GetTaskTrackerForUrl(const GURL& url) const {
for (auto it = tasks_.begin(); it != tasks_.end(); ++it) {
if ((*it)->HasUrl(url)) {
return (*it).get();
}
}
return nullptr;
}
TaskTracker* DomDistillerService::CreateTaskTracker(const ArticleEntry& entry) {
TaskTracker::CancelCallback cancel_callback =
base::BindOnce(&DomDistillerService::CancelTask, base::Unretained(this));
tasks_.push_back(std::make_unique<TaskTracker>(
entry, std::move(cancel_callback), content_store_.get()));
return tasks_.back().get();
}
void DomDistillerService::CancelTask(TaskTracker* task) {
auto it = std::ranges::find(tasks_, task, &std::unique_ptr<TaskTracker>::get);
if (it != tasks_.end()) {
it->release();
tasks_.erase(it);
base::SingleThreadTaskRunner::GetCurrentDefault()->DeleteSoon(FROM_HERE,
task);
}
}
DistilledPagePrefs* DomDistillerService::GetDistilledPagePrefs() {
return distilled_page_prefs_.get();
}
DistillerUIHandle* DomDistillerService::GetDistillerUIHandle() {
return distiller_ui_handle_.get();
}
base::WeakPtr<DomDistillerService> DomDistillerService::GetWeakPtr() {
return weak_ptr_factory_.GetWeakPtr();
}
bool DomDistillerService::HasTaskTrackerForTesting(const GURL& url) const {
return GetTaskTrackerForUrl(url);
}
} // namespace dom_distiller
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