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// Copyright 2022 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/feed/web_feed_page_information_fetcher.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "chrome/browser/feed/rss_links_fetcher.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/web_contents.h"
namespace feed {
using PageInformation = WebFeedPageInformationFetcher::PageInformation;
namespace {
void FetchPageCanonicalUrl(
const PageInformation& page_info,
base::OnceCallback<void(const std::optional<::GURL>&)> callback) {
DCHECK(page_info.web_contents->GetPrimaryMainFrame()->IsRenderFrameLive());
page_info.web_contents->GetPrimaryMainFrame()->GetCanonicalUrl(
std::move(callback));
}
} // namespace
// static
void WebFeedPageInformationFetcher::Start(
const PageInformation& page_info,
const WebFeedPageInformationRequestReason reason,
base::OnceCallback<void(WebFeedPageInformation)> callback) {
DVLOG(2) << "PageInformationRequested reason=" << reason;
base::UmaHistogramEnumeration(
"ContentSuggestions.Feed.WebFeed.PageInformationRequested", reason);
// Make sure the renderer still exists, i.e., not crashed, since this may
// be triggered asynchronously.
if (!page_info.web_contents->GetPrimaryMainFrame()->IsRenderFrameLive()) {
std::move(callback).Run(WebFeedPageInformation());
return;
}
// Perform two async operations, and call `callback` only after both are
// complete. Keep state as RefCounted, owned by the callbacks.
auto self = base::MakeRefCounted<WebFeedPageInformationFetcher>(
page_info, std::move(callback));
FetchRssLinks(
page_info.url, page_info.web_contents,
base::BindOnce(&WebFeedPageInformationFetcher::OnRssFetched, self));
FetchPageCanonicalUrl(
page_info,
base::BindOnce(&WebFeedPageInformationFetcher::OnCanonicalUrlFetched,
self));
}
WebFeedPageInformationFetcher::WebFeedPageInformationFetcher(
const PageInformation& initial_page_info,
base::OnceCallback<void(WebFeedPageInformation)> callback)
: callback_(std::move(callback)) {
page_info_.SetUrl(initial_page_info.url);
}
WebFeedPageInformationFetcher::~WebFeedPageInformationFetcher() = default;
void WebFeedPageInformationFetcher::CallCallbackIfReady() {
if (rss_fetched_ && url_fetched_)
std::move(callback_).Run(std::move(page_info_));
}
void WebFeedPageInformationFetcher::OnCanonicalUrlFetched(
const std::optional<::GURL>& url) {
if (url) {
page_info_.SetCanonicalUrl(*url);
}
url_fetched_ = true;
CallCallbackIfReady();
}
void WebFeedPageInformationFetcher::OnRssFetched(std::vector<GURL> rss_urls) {
page_info_.SetRssUrls(std::move(rss_urls));
rss_fetched_ = true;
CallCallbackIfReady();
}
} // namespace feed
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