Display DNS probe results.

chrome/browser/net/dns_probe_browsertest.cc

+// Copyright (c) 2013 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 "base/bind.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop.h"
+#include "base/path_service.h"
+#include "base/threading/thread_restrictions.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/google/google_util.h"
+#include "chrome/browser/io_thread.h"
+#include "chrome/browser/net/dns_probe_test_util.h"
+#include "chrome/browser/net/net_error_tab_helper.h"
+#include "chrome/browser/net/url_request_mock_util.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/common/chrome_paths.h"
+#include "chrome/common/net/net_error_info.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/ui_test_utils.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/test/browser_test_utils.h"
+#include "content/test/net/url_request_failed_job.h"
+#include "content/test/net/url_request_mock_http_job.h"
+#include "net/base/net_errors.h"
+#include "net/dns/dns_test_util.h"
+#include "net/url_request/url_request_filter.h"
+#include "net/url_request/url_request_job.h"
+#include "net/url_request/url_request_job_factory.h"
+
+using base::Bind;
+using base::Callback;
+using base::Closure;
+using base::ConstRef;
+using base::FilePath;
+using base::MessageLoop;
+using base::Unretained;
+using chrome_common_net::DnsProbeStatus;
+using content::BrowserThread;
+using content::URLRequestFailedJob;
+using content::URLRequestMockHTTPJob;
+using content::WebContents;
+using google_util::LinkDoctorBaseURL;
+using net::MockDnsClientRule;
+using net::NetworkDelegate;
+using net::URLRequest;
+using net::URLRequestFilter;
+using net::URLRequestJob;
+using net::URLRequestJobFactory;
+using ui_test_utils::NavigateToURL;
+using ui_test_utils::NavigateToURLBlockUntilNavigationsComplete;
+
+namespace chrome_browser_net {
+
+namespace {
+
+// Wraps DnsProbeService and delays callbacks until someone calls
+// CallDelayedCallbacks.  This allows the DnsProbeBrowserTest to enforce a
+// stricter ordering of events.
+class DelayingDnsProbeService : public DnsProbeService {
+ public:
+  DelayingDnsProbeService() {}
+
+  virtual ~DelayingDnsProbeService() {
+    EXPECT_TRUE(delayed_probes_.empty());
+  }
+
+  virtual void ProbeDns(const ProbeCallback& callback) OVERRIDE {
+    delayed_probes_.push_back(callback);
+  }
+
+  void StartDelayedProbes() {
+    std::vector<ProbeCallback> probes;
+    probes.swap(delayed_probes_);
+
+    for (std::vector<ProbeCallback>::const_iterator i = probes.begin();
+         i != probes.end(); ++i) {
+      DnsProbeService::ProbeDns(*i);
+    }
+  }
+
+  int delayed_probe_count() const { return delayed_probes_.size(); }

[mmenke, 2013/07/12 20:09:00]

Suggest verifying this and StartDelayedProbes are called on the IO thread,
mostly for documentation purposes.

[Deprecated (see juliatuttle), 2013/07/12 20:55:55]

Done.

+
+ private:
+  std::vector<ProbeCallback> delayed_probes_;
+};
+
+FilePath GetMockLinkDoctorFilePath() {
+  FilePath root_http;
+  PathService::Get(chrome::DIR_TEST_DATA, &root_http);
+  return root_http.AppendASCII("mock-link-doctor.html");
+}
+
+class BrokenLinkDoctorProtocolHandler

[mmenke, 2013/07/12 20:09:00]

Since this cal also handle non-broken link doctors, may just want to call it
LinkDoctorProtocolHandler.

[Deprecated (see juliatuttle), 2013/07/12 20:55:55]

BreakableLinkDoctorProtocolHandler :)

+    : public URLRequestJobFactory::ProtocolHandler {
+ public:
+  explicit BrokenLinkDoctorProtocolHandler(
+      const FilePath& mock_link_doctor_file_path)
+      : mock_link_doctor_file_path_(mock_link_doctor_file_path),
+        net_error_(net::OK) {}
+
+  virtual ~BrokenLinkDoctorProtocolHandler() {}
+
+  virtual URLRequestJob* MaybeCreateJob(
+      URLRequest* request, NetworkDelegate* network_delegate) const OVERRIDE {
+    if (net_error_ != net::OK) {
+      return new URLRequestFailedJob(request, network_delegate, net_error_);
+    } else {
+      return new URLRequestMockHTTPJob(
+          request, network_delegate, mock_link_doctor_file_path_);
+    }
+  }
+
+  void set_net_error(int net_error) { net_error_ = net_error; }
+
+ private:
+  const FilePath mock_link_doctor_file_path_;
+  int net_error_;
+};
+
+class DnsProbeBrowserTestIOThreadHelper {
+ public:
+  DnsProbeBrowserTestIOThreadHelper();
+
+  void SetUpOnIOThread(IOThread* io_thread);
+  void CleanUpOnIOThreadAndDeleteHelper();
+
+  void SetMockDnsClientRules(MockDnsClientRule::Result system_good_result,
+                             MockDnsClientRule::Result public_good_result);
+  void SetLinkDoctorNetError(int link_doctor_net_error);
+  void StartDelayedProbes(int expected_delayed_probe_count);
+
+ private:
+  IOThread* io_thread_;
+  DnsProbeService* original_dns_probe_service_;
+  DelayingDnsProbeService* delaying_dns_probe_service_;
+  BrokenLinkDoctorProtocolHandler* protocol_handler_;
+  FilePath mock_link_doctor_file_path_;
+};
+
+DnsProbeBrowserTestIOThreadHelper::DnsProbeBrowserTestIOThreadHelper()
+    : io_thread_(NULL),
+      original_dns_probe_service_(NULL),
+      delaying_dns_probe_service_(NULL),
+      protocol_handler_(NULL),
+      mock_link_doctor_file_path_(GetMockLinkDoctorFilePath()) {}
+
+void DnsProbeBrowserTestIOThreadHelper::SetUpOnIOThread(IOThread* io_thread) {
+  CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  CHECK(io_thread);
+  CHECK(!io_thread_);
+  CHECK(!original_dns_probe_service_);
+  CHECK(!delaying_dns_probe_service_);
+  CHECK(!protocol_handler_);
+
+  io_thread_ = io_thread;
+
+  delaying_dns_probe_service_ = new DelayingDnsProbeService();
+
+  IOThread::Globals* globals = io_thread_->globals();
+  original_dns_probe_service_ = globals->dns_probe_service.release();
+  globals->dns_probe_service.reset(delaying_dns_probe_service_);
+
+  URLRequestFailedJob::AddUrlHandler();
+
+  scoped_ptr<URLRequestJobFactory::ProtocolHandler> protocol_handler(
+      new BrokenLinkDoctorProtocolHandler(mock_link_doctor_file_path_));
+  protocol_handler_ =
+      static_cast<BrokenLinkDoctorProtocolHandler*>(protocol_handler.get());
+  const GURL link_doctor_base_url = LinkDoctorBaseURL();
+  const std::string link_doctor_host = link_doctor_base_url.host();
+  URLRequestFilter::GetInstance()->AddHostnameProtocolHandler(
+      "http", link_doctor_host, protocol_handler.Pass());
+}
+
+void DnsProbeBrowserTestIOThreadHelper::CleanUpOnIOThreadAndDeleteHelper() {
+  CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  URLRequestFilter::GetInstance()->ClearHandlers();
+
+  IOThread::Globals* globals = io_thread_->globals();
+  scoped_ptr<DnsProbeService> delaying_dns_probe_service(
+      globals->dns_probe_service.release());
+  globals->dns_probe_service.reset(original_dns_probe_service_);
+
+  CHECK_EQ(delaying_dns_probe_service_, delaying_dns_probe_service.get());
+
+  delete this;
+}
+
+void DnsProbeBrowserTestIOThreadHelper::SetMockDnsClientRules(
+    MockDnsClientRule::Result system_result,
+    MockDnsClientRule::Result public_result) {
+  CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  DnsProbeService* service = io_thread_->globals()->dns_probe_service.get();
+  service->SetSystemClientForTesting(
+      CreateMockDnsClientForProbes(system_result));
+  service->SetPublicClientForTesting(
+      CreateMockDnsClientForProbes(public_result));
+}
+
+void DnsProbeBrowserTestIOThreadHelper::SetLinkDoctorNetError(
+    int link_doctor_net_error) {
+  CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  protocol_handler_->set_net_error(link_doctor_net_error);
+}
+
+void DnsProbeBrowserTestIOThreadHelper::StartDelayedProbes(
+    int expected_delayed_probe_count) {
+  CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  CHECK(delaying_dns_probe_service_);
+
+  int actual_delayed_probe_count =
+      delaying_dns_probe_service_->delayed_probe_count();
+  EXPECT_EQ(expected_delayed_probe_count, actual_delayed_probe_count);
+
+  delaying_dns_probe_service_->StartDelayedProbes();
+}
+
+class DnsProbeBrowserTest : public InProcessBrowserTest {
+ public:
+  DnsProbeBrowserTest();
+
+  virtual void SetUpOnMainThread() OVERRIDE;
+  virtual void CleanUpOnMainThread() OVERRIDE;
+
+ protected:
+  void SetLinkDoctorBroken(bool broken);
+  void SetMockDnsClientRules(MockDnsClientRule::Result system_result,
+                             MockDnsClientRule::Result public_result);
+  void NavigateToDnsError();
+  void NavigateToOtherError();
+
+  void StartDelayedProbes(int expected_delayed_probe_count);
+  DnsProbeStatus WaitForSentStatus();
+  int dns_probe_status_count() const { return dns_probe_status_count_; }
+
+  std::string Title();
+  bool PageContains(const std::string& expected);
+
+ private:
+  void OnDnsProbeStatusSent(DnsProbeStatus dns_probe_status);
+
+  DnsProbeBrowserTestIOThreadHelper* helper_;
+
+  bool awaiting_dns_probe_status_;
+  int dns_probe_status_count_;
+  std::list<DnsProbeStatus> dns_probe_statuses_;

[mmenke, 2013/07/12 20:09:00]

Think it's worth commenting on this one.

[Deprecated (see juliatuttle), 2013/07/12 20:55:55]

Done.

+};
+
+DnsProbeBrowserTest::DnsProbeBrowserTest()
+    : helper_(new DnsProbeBrowserTestIOThreadHelper()),
+      awaiting_dns_probe_status_(false),
+      dns_probe_status_count_(0) {
+}
+
+void DnsProbeBrowserTest::SetUpOnMainThread() {
+  NetErrorTabHelper::set_state_for_testing(
+      NetErrorTabHelper::TESTING_FORCE_ENABLED);
+
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      Bind(&DnsProbeBrowserTestIOThreadHelper::SetUpOnIOThread,
+           Unretained(helper_),
+           g_browser_process->io_thread()));
+
+  NetErrorTabHelper* tab_helper = NetErrorTabHelper::FromWebContents(
+      browser()->tab_strip_model()->GetActiveWebContents());
+  tab_helper->set_dns_probe_status_snoop_callback_for_testing(Bind(
+      &DnsProbeBrowserTest::OnDnsProbeStatusSent,
+      Unretained(this)));
+}
+
+void DnsProbeBrowserTest::CleanUpOnMainThread() {
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      Bind(&DnsProbeBrowserTestIOThreadHelper::CleanUpOnIOThreadAndDeleteHelper,
+           Unretained(helper_)));
+
+  NetErrorTabHelper::set_state_for_testing(
+      NetErrorTabHelper::TESTING_DEFAULT);
+}
+
+void DnsProbeBrowserTest::SetLinkDoctorBroken(bool broken) {
+  int net_error = broken ? net::ERR_NAME_NOT_RESOLVED : net::OK;
+
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      Bind(&DnsProbeBrowserTestIOThreadHelper::SetLinkDoctorNetError,
+           Unretained(helper_),
+           net_error));
+}
+
+// These two functions wait for two navigations because Link Doctor loads two
+// pages: a blank page, so the user stops seeing the previous page, and then
+// either the Link Doctor page or a regular error page.  We want to wait for
+// the error page, so we wait for both loads to finish.
+
+void DnsProbeBrowserTest::NavigateToDnsError() {
+  NavigateToURLBlockUntilNavigationsComplete(
+      browser(),
+      URLRequestFailedJob::GetMockHttpUrl(net::ERR_NAME_NOT_RESOLVED),
+      2);
+}
+
+void DnsProbeBrowserTest::NavigateToOtherError() {
+  NavigateToURLBlockUntilNavigationsComplete(
+      browser(),
+      URLRequestFailedJob::GetMockHttpUrl(net::ERR_CONNECTION_REFUSED),
+      2);
+}
+
+void DnsProbeBrowserTest::SetMockDnsClientRules(
+    MockDnsClientRule::Result system_result,
+    MockDnsClientRule::Result public_result) {
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      Bind(&DnsProbeBrowserTestIOThreadHelper::SetMockDnsClientRules,
+           Unretained(helper_),
+           system_result,
+           public_result));
+}
+
+void DnsProbeBrowserTest::StartDelayedProbes(
+    int expected_delayed_probe_count) {
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      Bind(&DnsProbeBrowserTestIOThreadHelper::StartDelayedProbes,
+           Unretained(helper_),
+           expected_delayed_probe_count));
+}
+
+DnsProbeStatus DnsProbeBrowserTest::WaitForSentStatus() {
+  CHECK(!awaiting_dns_probe_status_);
+  while (dns_probe_statuses_.empty()) {
+    awaiting_dns_probe_status_ = true;
+    MessageLoop::current()->Run();
+    awaiting_dns_probe_status_ = false;
+  }
+
+  CHECK(!dns_probe_statuses_.empty());
+  DnsProbeStatus status = dns_probe_statuses_.front();
+  dns_probe_statuses_.pop_front();
+  return status;
+}
+
+// Check title by roundtripping to renderer, to make sure any probe results
+// sent before this have been applied.
+std::string DnsProbeBrowserTest::Title() {
+  std::string title;
+
+  WebContents* contents =
+      browser()->tab_strip_model()->GetActiveWebContents();
+
+  bool rv = content::ExecuteScriptAndExtractString(
+      contents,
+      "domAutomationController.send(document.title);",
+      &title);
+  if (!rv)
+    return "";
+
+  return title;
+}
+
+// Check text by roundtripping to renderer, to make sure any probe results
+// sent before this have been applied.
+bool DnsProbeBrowserTest::PageContains(const std::string& expected) {
+  std::string text_content;
+
+  bool rv = content::ExecuteScriptAndExtractString(
+      browser()->tab_strip_model()->GetActiveWebContents(),
+      "domAutomationController.send(document.body.textContent);",
+      &text_content);
+  if (!rv)
+    return false;
+
+  return text_content.find(expected) != std::string::npos;
+}
+
+void DnsProbeBrowserTest::OnDnsProbeStatusSent(
+    DnsProbeStatus dns_probe_status) {
+  dns_probe_statuses_.push_back(dns_probe_status);
+

[mmenke, 2013/07/12 20:09:00]

optional nit:  Think this linebreak makes more sense after
"dns_probe_status_count_++;"

[Deprecated (see juliatuttle), 2013/07/12 20:55:55]

Done.

+  dns_probe_status_count_++;
+  if (awaiting_dns_probe_status_)
+    MessageLoop::current()->Quit();
+}
+
+// Make sure probes don't break non-DNS error pages when Link Doctor loads.
+IN_PROC_BROWSER_TEST_F(DnsProbeBrowserTest, OtherErrorWithWorkingLinkDoctor) {
+  SetLinkDoctorBroken(false);
+
+  NavigateToOtherError();
+  EXPECT_EQ("Mock Link Doctor", Title());
+
+  EXPECT_EQ(0, dns_probe_status_count());
+}
+
+// Make sure probes don't break non-DNS error pages when Link Doctor doesn't
+// load.
+IN_PROC_BROWSER_TEST_F(DnsProbeBrowserTest, OtherErrorWithBrokenLinkDoctor) {
+  SetLinkDoctorBroken(true);
+
+  NavigateToOtherError();
+  EXPECT_TRUE(PageContains("CONNECTION_REFUSED"));
+
+  EXPECT_EQ(0, dns_probe_status_count());
+}
+
+// Make sure probes don't break DNS error pages when Link doctor loads.
+IN_PROC_BROWSER_TEST_F(DnsProbeBrowserTest,
+    NxdomainProbeResultWithWorkingLinkDoctor) {
+  SetLinkDoctorBroken(false);
+  SetMockDnsClientRules(MockDnsClientRule::OK, MockDnsClientRule::OK);
+
+  NavigateToDnsError();
+  EXPECT_EQ("Mock Link Doctor", Title());
+
+  EXPECT_EQ(chrome_common_net::DNS_PROBE_STARTED, WaitForSentStatus());
+  EXPECT_EQ(chrome_common_net::DNS_PROBE_STARTED, WaitForSentStatus());
+  EXPECT_EQ(2, dns_probe_status_count());
+  EXPECT_EQ("Mock Link Doctor", Title());
+
+  StartDelayedProbes(1);
+
+  EXPECT_EQ(chrome_common_net::DNS_PROBE_FINISHED_NXDOMAIN,
+            WaitForSentStatus());
+  EXPECT_EQ(3, dns_probe_status_count());
+  EXPECT_EQ("Mock Link Doctor", Title());
+}
+
+// Make sure probes update DNS error page properly when they're supposed to.
+IN_PROC_BROWSER_TEST_F(DnsProbeBrowserTest,
+    NoInternetProbeResultWithBrokenLinkDoctor) {
+  SetLinkDoctorBroken(true);
+  SetMockDnsClientRules(MockDnsClientRule::TIMEOUT,
+                        MockDnsClientRule::TIMEOUT);
+
+  NavigateToDnsError();
+
+  EXPECT_EQ(chrome_common_net::DNS_PROBE_STARTED, WaitForSentStatus());
+  EXPECT_EQ(chrome_common_net::DNS_PROBE_STARTED, WaitForSentStatus());
+
+  // PageContains runs the RunLoop, so make sure nothing hairy happens.
+  EXPECT_EQ(2, dns_probe_status_count());
+  EXPECT_TRUE(PageContains("DNS_PROBE_STARTED"));
+  EXPECT_EQ(2, dns_probe_status_count());
+
+  StartDelayedProbes(1);
+
+  EXPECT_EQ(chrome_common_net::DNS_PROBE_FINISHED_NO_INTERNET,
+            WaitForSentStatus());
+
+  // PageContains runs the RunLoop, so make sure nothing hairy happens.
+  EXPECT_EQ(3, dns_probe_status_count());
+  EXPECT_TRUE(PageContains("DNS_PROBE_FINISHED_NO_INTERNET"));
+  EXPECT_EQ(3, dns_probe_status_count());
+}
+
+// Double-check to make sure sync failures don't explode.
+IN_PROC_BROWSER_TEST_F(DnsProbeBrowserTest, SyncFailureWithBrokenLinkDoctor) {
+  SetLinkDoctorBroken(true);
+  SetMockDnsClientRules(MockDnsClientRule::FAIL_SYNC,
+                        MockDnsClientRule::FAIL_SYNC);
+
+  NavigateToDnsError();
+
+  EXPECT_EQ(chrome_common_net::DNS_PROBE_STARTED, WaitForSentStatus());
+  EXPECT_EQ(chrome_common_net::DNS_PROBE_STARTED, WaitForSentStatus());
+
+  // PageContains runs the RunLoop, so make sure nothing hairy happens.
+  EXPECT_EQ(2, dns_probe_status_count());
+  EXPECT_TRUE(PageContains("DNS_PROBE_STARTED"));
+  EXPECT_EQ(2, dns_probe_status_count());
+
+  StartDelayedProbes(1);
+
+  EXPECT_EQ(chrome_common_net::DNS_PROBE_FINISHED_UNKNOWN,
+            WaitForSentStatus());
+
+  // PageContains runs the RunLoop, so make sure nothing hairy happens.
+  EXPECT_EQ(3, dns_probe_status_count());
+  EXPECT_TRUE(PageContains("NAME_NOT_RESOLVED"));
+  EXPECT_EQ(3, dns_probe_status_count());
+}
+
+// Make sure probes don't run for subframe DNS errors.
+IN_PROC_BROWSER_TEST_F(DnsProbeBrowserTest, NoProbeInSubframe) {
+  SetLinkDoctorBroken(false);
+
+  const FilePath::CharType kIframeDnsErrorHtmlName[] =
+      FILE_PATH_LITERAL("iframe_dns_error.html");
+
+  NavigateToURL(
+      browser(),
+      URLRequestMockHTTPJob::GetMockUrl(FilePath(kIframeDnsErrorHtmlName)));
+
+  // By the time NavigateToURL returns, the browser will have seen the failed
+  // provisional load.  If a probe was started (or considered but not run),
+  // then the NetErrorTabHelper would have sent a NetErrorInfo message.  Thus,
+  // if one hasn't been sent by now, the NetErrorTabHelper has not (and won't)
+  // start a probe for this DNS error.
+  EXPECT_EQ(0, dns_probe_status_count());
+}
+
+// Make sure browser sends NOT_RUN properly when probes are disabled.
+IN_PROC_BROWSER_TEST_F(DnsProbeBrowserTest, ProbesDisabled) {
+  NetErrorTabHelper::set_state_for_testing(
+      NetErrorTabHelper::TESTING_FORCE_DISABLED);
+
+  SetLinkDoctorBroken(true);
+  SetMockDnsClientRules(MockDnsClientRule::TIMEOUT,
+                        MockDnsClientRule::TIMEOUT);
+
+  NavigateToDnsError();
+
+  EXPECT_EQ(chrome_common_net::DNS_PROBE_NOT_RUN, WaitForSentStatus());
+  EXPECT_EQ(chrome_common_net::DNS_PROBE_NOT_RUN, WaitForSentStatus());
+
+  // PageContains runs the RunLoop, so make sure nothing hairy happens.
+  EXPECT_EQ(2, dns_probe_status_count());
+  EXPECT_TRUE(PageContains("NAME_NOT_RESOLVED"));
+  EXPECT_EQ(2, dns_probe_status_count());
+}
+
+}  // namespace
+
+}  // namespace chrome_browser_net