root/components/dom_distiller/standalone/content_extractor.cc

DEFINITIONS

1. CreateDomDistillerService
2. AddComponentsResources
3. LogArticle
4. Start
5. GetArticleCopy
6. CreateForCommandLine
7. OnArticleUpdated
8. OnArticleReady
9. SetUpOnMainThread
10. TearDownOnMainThread
11. Start
12. EnableDNSLookupForThisTest
13. DisableDNSLookupForThisTest
14. Finish
15. IN_PROC_BROWSER_TEST_F

// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <sstream>

#include "base/command_line.h"
#include "base/files/scoped_temp_dir.h"
#include "base/message_loop/message_loop.h"
#include "base/path_service.h"
#include "base/run_loop.h"
#include "components/dom_distiller/content/distiller_page_web_contents.h"
#include "components/dom_distiller/core/distiller.h"
#include "components/dom_distiller/core/dom_distiller_database.h"
#include "components/dom_distiller/core/dom_distiller_service.h"
#include "components/dom_distiller/core/dom_distiller_store.h"
#include "components/dom_distiller/core/proto/distilled_article.pb.h"
#include "components/dom_distiller/core/proto/distilled_page.pb.h"
#include "components/dom_distiller/core/task_tracker.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/test/content_browser_test.h"
#include "content/shell/browser/shell.h"
#include "net/dns/mock_host_resolver.h"
#include "ui/base/resource/resource_bundle.h"

using content::ContentBrowserTest;

namespace dom_distiller {

namespace {

const char* kUrlSwitch = "url";

scoped_ptr<DomDistillerService> CreateDomDistillerService(
    content::BrowserContext* context,
    const base::FilePath& db_path) {
  scoped_refptr<base::SequencedTaskRunner> background_task_runner =
      content::BrowserThread::GetBlockingPool()->GetSequencedTaskRunner(
          content::BrowserThread::GetBlockingPool()->GetSequenceToken());

  // TODO(cjhopman): use an in-memory database instead of an on-disk one with
  // temporary directory.
  scoped_ptr<DomDistillerDatabase> db(
      new DomDistillerDatabase(background_task_runner));
  scoped_ptr<DomDistillerStore> dom_distiller_store(new DomDistillerStore(
      db.PassAs<DomDistillerDatabaseInterface>(), db_path));

  scoped_ptr<DistillerPageFactory> distiller_page_factory(
      new DistillerPageWebContentsFactory(context));
  scoped_ptr<DistillerURLFetcherFactory> distiller_url_fetcher_factory(
      new DistillerURLFetcherFactory(context->GetRequestContext()));
  scoped_ptr<DistillerFactory> distiller_factory(new DistillerFactoryImpl(
      distiller_page_factory.Pass(), distiller_url_fetcher_factory.Pass()));

  return scoped_ptr<DomDistillerService>(new DomDistillerService(
      dom_distiller_store.PassAs<DomDistillerStoreInterface>(),
      distiller_factory.Pass()));
}

void AddComponentsResources() {
  base::FilePath pak_file;
  base::FilePath pak_dir;
  PathService::Get(base::DIR_MODULE, &pak_dir);
  pak_file = pak_dir.Append(FILE_PATH_LITERAL("components_resources.pak"));
  ui::ResourceBundle::GetSharedInstance().AddDataPackFromPath(
      pak_file, ui::SCALE_FACTOR_NONE);
}

void LogArticle(const DistilledArticleProto& article_proto) {
  std::stringstream output;
  output << "Article Title: " << article_proto.title() << std::endl;
  output << "# of pages: " << article_proto.pages_size() << std::endl;
  for (int i = 0; i < article_proto.pages_size(); ++i) {
    const DistilledPageProto& page = article_proto.pages(i);
    output << "Page " << i << std::endl;
    output << "URL: " << page.url() << std::endl;
    output << "Content: " << page.html() << std::endl;
  }
  VLOG(0) << output.str();
}

}  // namespace

class ContentExtractionRequest : public ViewRequestDelegate {
 public:
  void Start(DomDistillerService* service, base::Closure finished_callback) {
    finished_callback_ = finished_callback;
    viewer_handle_ = service->ViewUrl(this, url_);
  }

  DistilledArticleProto GetArticleCopy() {
    return *article_proto_;
  }

  static scoped_ptr<ContentExtractionRequest> CreateForCommandLine(
      const CommandLine& command_line) {
    GURL url;
    if (command_line.HasSwitch(kUrlSwitch)) {
      std::string url_string = command_line.GetSwitchValueASCII(kUrlSwitch);
      url = GURL(url_string);
    }
    if (!url.is_valid()) {
      ADD_FAILURE() << "No valid url provided";
      return scoped_ptr<ContentExtractionRequest>();
    }
    return scoped_ptr<ContentExtractionRequest>(
        new ContentExtractionRequest(url));
  }

 private:
  ContentExtractionRequest(const GURL& url) : url_(url) {}

  virtual void OnArticleUpdated(ArticleDistillationUpdate article_update)
      OVERRIDE {}

  virtual void OnArticleReady(const DistilledArticleProto* article_proto)
      OVERRIDE {
    article_proto_ = article_proto;
    base::MessageLoop::current()->PostTask(
        FROM_HERE,
        finished_callback_);
  }

  const DistilledArticleProto* article_proto_;
  scoped_ptr<ViewerHandle> viewer_handle_;
  GURL url_;
  base::Closure finished_callback_;
};

class ContentExtractor : public ContentBrowserTest {
  // Change behavior of the default host resolver to avoid DNS lookup errors, so
  // we can make network calls.
  virtual void SetUpOnMainThread() OVERRIDE {
    EnableDNSLookupForThisTest();
    CHECK(db_dir_.CreateUniqueTempDir());
    AddComponentsResources();
  }

  virtual void TearDownOnMainThread() OVERRIDE {
    DisableDNSLookupForThisTest();
  }

 protected:
  // Creates the DomDistillerService and creates and starts the extraction
  // request.
  void Start() {
    content::BrowserContext* context =
        shell()->web_contents()->GetBrowserContext();
    service_ = CreateDomDistillerService(context,
                                         db_dir_.path());
    const CommandLine& command_line = *CommandLine::ForCurrentProcess();
    request_ = ContentExtractionRequest::CreateForCommandLine(command_line);
    request_->Start(
        service_.get(),
        base::Bind(&ContentExtractor::Finish, base::Unretained(this)));
  }

 private:
  // Change behavior of the default host resolver to allow DNS lookup
  // to proceed instead of being blocked by the test infrastructure.
  void EnableDNSLookupForThisTest() {
    // mock_host_resolver_override_ takes ownership of the resolver.
    scoped_refptr<net::RuleBasedHostResolverProc> resolver =
        new net::RuleBasedHostResolverProc(host_resolver());
    resolver->AllowDirectLookup("*");
    mock_host_resolver_override_.reset(
        new net::ScopedDefaultHostResolverProc(resolver.get()));
  }

  // We need to reset the DNS lookup when we finish, or the test will fail.
  void DisableDNSLookupForThisTest() {
    mock_host_resolver_override_.reset();
  }

  void Finish() {
    LogArticle(request_->GetArticleCopy());
    request_.reset();
    service_.reset();
    base::MessageLoop::current()->PostTask(
        FROM_HERE, base::MessageLoop::QuitWhenIdleClosure());
  }

  base::ScopedTempDir db_dir_;
  scoped_ptr<net::ScopedDefaultHostResolverProc> mock_host_resolver_override_;
  scoped_ptr<DomDistillerService> service_;
  scoped_ptr<ContentExtractionRequest> request_;
};

IN_PROC_BROWSER_TEST_F(ContentExtractor, MANUAL_ExtractUrl) {
  Start();
  base::RunLoop().Run();
}

}  // namespace dom_distiller