Reporting of policy errors via host-offline-reason: part 3

remoting/host/remoting_me2me_host.cc

Index: remoting/host/remoting_me2me_host.cc
diff --git a/remoting/host/remoting_me2me_host.cc b/remoting/host/remoting_me2me_host.cc
index f2aa98331acea8f1f8076cf4540bed9a2c5220c0..723cd00fa054949f9065e8b7abee2651902103d5 100644
--- a/remoting/host/remoting_me2me_host.cc
+++ b/remoting/host/remoting_me2me_host.cc
@@ -14,6 +14,7 @@
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
@@ -26,7 +27,6 @@
 #include "ipc/ipc_channel_proxy.h"
 #include "ipc/ipc_listener.h"
 #include "media/base/media.h"
-#include "net/base/network_change_notifier.h"
 #include "net/socket/client_socket_factory.h"
 #include "net/socket/ssl_server_socket.h"
 #include "net/url_request/url_fetcher.h"
@@ -45,13 +45,12 @@
 #include "remoting/host/config_watcher.h"
 #include "remoting/host/desktop_environment.h"
 #include "remoting/host/desktop_session_connector.h"
-#include "remoting/host/dns_blackhole_checker.h"
-#include "remoting/host/heartbeat_sender.h"
 #include "remoting/host/host_change_notification_listener.h"
 #include "remoting/host/host_config.h"
 #include "remoting/host/host_event_logger.h"
 #include "remoting/host/host_exit_codes.h"
 #include "remoting/host/host_main.h"
+#include "remoting/host/host_signaling_manager.h"
 #include "remoting/host/host_status_logger.h"
 #include "remoting/host/ipc_constants.h"
 #include "remoting/host/ipc_desktop_environment.h"
@@ -61,7 +60,6 @@
 #include "remoting/host/pairing_registry_delegate.h"
 #include "remoting/host/policy_hack/policy_watcher.h"
 #include "remoting/host/session_manager_factory.h"
-#include "remoting/host/signaling_connector.h"
 #include "remoting/host/single_window_desktop_environment.h"
 #include "remoting/host/token_validator_factory_impl.h"
 #include "remoting/host/usage_stats_consent.h"
@@ -134,6 +132,10 @@ const char kStdinConfigPath[] = "-";
 
 const char kWindowIdSwitchName[] = "window-id";
 
+// Maximum time to wait for reporting host-offline-reason to the service,
+// before continuing normal process shutdown.
+const int kHostOfflineReasonTimeoutSeconds = 10;
+
 }  // namespace
 
 namespace remoting {
@@ -240,6 +242,8 @@ class HostProcess
   bool OnPairingPolicyUpdate(base::DictionaryValue* policies);
   bool OnGnubbyAuthPolicyUpdate(base::DictionaryValue* policies);
 
+  scoped_ptr<HostSignalingManager> CreateHostSignalingManager();
+
   void StartHost();
 
   void OnHeartbeatSuccessful();
@@ -252,8 +256,6 @@ class HostProcess
   // Stops the host and shuts down the process with the specified |exit_code|.
   void ShutdownHost(HostExitCodes exit_code);
 
-  void ScheduleHostShutdown();
-
   void ShutdownOnNetworkThread();
 
   void OnPolicyWatcherShutdown();
@@ -267,9 +269,6 @@ class HostProcess
 
   scoped_ptr<ChromotingHostContext> context_;
 
-  // Created on the UI thread but used from the network thread.
-  scoped_ptr<net::NetworkChangeNotifier> network_change_notifier_;
-
   // Accessed on the UI thread.
   scoped_ptr<IPC::ChannelProxy> daemon_channel_;
 
@@ -319,10 +318,7 @@ class HostProcess
   // Used to specify which window to stream, if enabled.
   webrtc::WindowId window_id_;
 
-  scoped_ptr<OAuthTokenGetter> oauth_token_getter_;
-  scoped_ptr<XmppSignalStrategy> signal_strategy_;
-  scoped_ptr<SignalingConnector> signaling_connector_;
-  scoped_ptr<HeartbeatSender> heartbeat_sender_;
+  scoped_ptr<HostSignalingManager> host_signaling_manager_;
   scoped_ptr<HostChangeNotificationListener> host_change_notification_listener_;
   scoped_ptr<HostStatusLogger> host_status_logger_;
   scoped_ptr<HostEventLogger> host_event_logger_;
@@ -340,6 +336,12 @@ class HostProcess
   bool signal_parent_;
 
   scoped_ptr<PairingRegistry::Delegate> pairing_registry_delegate_;
+
+  // Factory of weak pointers to |this| that will to be referenced from the
+  // network thread (weak pointers are constrained to a single thread).
+  base::WeakPtrFactory<HostProcess> weak_factory_for_network_task_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(HostProcess);
 };
 
 HostProcess::HostProcess(scoped_ptr<ChromotingHostContext> context,
@@ -364,7 +366,8 @@ HostProcess::HostProcess(scoped_ptr<ChromotingHostContext> context,
 #endif  // defined(REMOTING_MULTI_PROCESS)
       self_(this),
       exit_code_out_(exit_code_out),
-      signal_parent_(false) {
+      signal_parent_(false),
+      weak_factory_for_network_task_runner_(this) {
   StartOnUiThread();
 }
 
@@ -746,7 +749,6 @@ void HostProcess::ShutdownOnUiThread() {
   DCHECK(context_->ui_task_runner()->BelongsToCurrentThread());
 
   // Tear down resources that need to be torn down on the UI thread.
-  network_change_notifier_.reset();
   daemon_channel_.reset();
   desktop_environment_factory_.reset();
 
@@ -762,7 +764,6 @@ void HostProcess::ShutdownOnUiThread() {
 #endif
 }
 
-// Overridden from HeartbeatSender::Listener
 void HostProcess::OnUnknownHostIdError() {
   LOG(ERROR) << "Host ID not found.";
   ShutdownHost(kInvalidHostIdExitCode);
@@ -849,7 +850,8 @@ bool HostProcess::ApplyConfig(const base::DictionaryValue& config) {
   }
 
   if (!oauth_refresh_token_.empty()) {
-    // SignalingConnector is responsible for getting OAuth token.
+    // SignalingConnector (inside HostSignalingManager) is responsible for
+    // getting OAuth token.
     xmpp_server_config_.auth_token = "";
     xmpp_server_config_.auth_service = "oauth2";
   } else if (!config.GetString(kXmppAuthServiceConfigPath,
@@ -1229,44 +1231,30 @@ bool HostProcess::OnGnubbyAuthPolicyUpdate(base::DictionaryValue* policies) {
   return true;
 }
 
+scoped_ptr<HostSignalingManager>
+HostProcess::CreateHostSignalingManager() {
+  DCHECK(!host_id_.empty());  // Assumming |ApplyConfig| has already been run.
+  return HostSignalingManager::Create(
+      base::Bind(&HostProcess::OnHeartbeatSuccessful,
+                 weak_factory_for_network_task_runner_.GetWeakPtr()),
+      base::Bind(&HostProcess::OnUnknownHostIdError,
+                 weak_factory_for_network_task_runner_.GetWeakPtr()),
+      base::Bind(&HostProcess::OnAuthFailed,
+                 weak_factory_for_network_task_runner_.GetWeakPtr()),
+      *context_, xmpp_server_config_, talkgadget_prefix_, host_id_, key_pair_,
+      directory_bot_jid_, oauth_refresh_token_, use_service_account_);
+}
+
 void HostProcess::StartHost() {
   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
   DCHECK(!host_);
-  DCHECK(!signal_strategy_.get());
+  DCHECK(!host_signaling_manager_);
+
   DCHECK(state_ == HOST_INITIALIZING || state_ == HOST_STOPPING_TO_RESTART ||
          state_ == HOST_STOPPED) << state_;

[Lambros, 2014/12/16 02:14:05]

I don't think I've seen this construct before. Will it produce a readable log
message?

[Łukasz Anforowicz, 2014/12/17 18:02:04]

Semi-readable.  I'll fix by prepending "state = " to the message.  For general
usage see base/logging.h, in particular the comments here:
https://code.google.com/p/chromium/codesearch#chromium/src/base/logging.h&l=46

I double-checked that the streaming works the way I understood the comments in
base/... by adding the following to 1 of unit tests:

  int x = 123;
  DCHECK(x == 456) << x;

This produced a crash with the following as the top message.  Notice the
trailing "123":

[10311:10311:1217/095226:84800221205:FATAL:heartbeat_sender_unittest.cc(293)]
Check failed: x == 456. 123

BTW: I hope that the string literal added by me will be compiled-away on
non-Debug builds and won't end up increasing the size of the host
binary/executable.

   state_ = HOST_STARTED;
 
-  signal_strategy_.reset(
-      new XmppSignalStrategy(net::ClientSocketFactory::GetDefaultFactory(),
-                             context_->url_request_context_getter(),
-                             xmpp_server_config_));
-
-  scoped_ptr<DnsBlackholeChecker> dns_blackhole_checker(
-      new DnsBlackholeChecker(context_->url_request_context_getter(),
-                              talkgadget_prefix_));
-
-  // Create a NetworkChangeNotifier for use by the signaling connector.
-  network_change_notifier_.reset(net::NetworkChangeNotifier::Create());
-
-  signaling_connector_.reset(new SignalingConnector(
-      signal_strategy_.get(),
-      dns_blackhole_checker.Pass(),
-      base::Bind(&HostProcess::OnAuthFailed, this)));
-
-  if (!oauth_refresh_token_.empty()) {
-    scoped_ptr<OAuthTokenGetter::OAuthCredentials> oauth_credentials;
-    oauth_credentials.reset(
-        new OAuthTokenGetter::OAuthCredentials(
-            xmpp_server_config_.username, oauth_refresh_token_,
-            use_service_account_));
-
-    oauth_token_getter_.reset(new OAuthTokenGetter(
-        oauth_credentials.Pass(), context_->url_request_context_getter(),
-        false));
-
-    signaling_connector_->EnableOAuth(oauth_token_getter_.get());
-  }
+  host_signaling_manager_ = CreateHostSignalingManager();
 
   uint32 network_flags = 0;
   if (allow_nat_traversal_) {
@@ -1290,15 +1278,14 @@ void HostProcess::StartHost() {
   }
 
   host_.reset(new ChromotingHost(
-      signal_strategy_.get(),
+      host_signaling_manager_->signal_strategy(),
       desktop_environment_factory_.get(),
-      CreateHostSessionManager(signal_strategy_.get(), network_settings,
+      CreateHostSessionManager(host_signaling_manager_->signal_strategy(),
+                               network_settings,
                                context_->url_request_context_getter()),
-      context_->audio_task_runner(),
-      context_->input_task_runner(),
+      context_->audio_task_runner(), context_->input_task_runner(),
       context_->video_capture_task_runner(),
-      context_->video_encode_task_runner(),
-      context_->network_task_runner(),
+      context_->video_encode_task_runner(), context_->network_task_runner(),
       context_->ui_task_runner()));
 
   if (enable_vp9_) {
@@ -1320,17 +1307,13 @@ void HostProcess::StartHost() {
   host_->SetMaximumSessionDuration(base::TimeDelta::FromHours(20));
 #endif
 
-  heartbeat_sender_.reset(new HeartbeatSender(
-      base::Bind(&HostProcess::OnHeartbeatSuccessful, base::Unretained(this)),
-      base::Bind(&HostProcess::OnUnknownHostIdError, base::Unretained(this)),
-      host_id_, signal_strategy_.get(), key_pair_, directory_bot_jid_));
-
   host_change_notification_listener_.reset(new HostChangeNotificationListener(
-      this, host_id_, signal_strategy_.get(), directory_bot_jid_));
+      this, host_id_, host_signaling_manager_->signal_strategy(),
+      directory_bot_jid_));
 
-  host_status_logger_.reset(
-      new HostStatusLogger(host_->AsWeakPtr(), ServerLogEntry::ME2ME,
-                           signal_strategy_.get(), directory_bot_jid_));
+  host_status_logger_.reset(new HostStatusLogger(
+      host_->AsWeakPtr(), ServerLogEntry::ME2ME,
+      host_signaling_manager_->signal_strategy(), directory_bot_jid_));
 
   // Set up reporting the host status notifications.
 #if defined(REMOTING_MULTI_PROCESS)
@@ -1367,14 +1350,23 @@ void HostProcess::ShutdownHost(HostExitCodes exit_code) {
   switch (state_) {
     case HOST_INITIALIZING:
       state_ = HOST_STOPPING;
+      {
+        DCHECK(!host_signaling_manager_);
+        scoped_ptr<HostSignalingManager> tmp_signaling_manager =
+            CreateHostSignalingManager();
+        tmp_signaling_manager.release()->SendHostOfflineReasonAndDelete(
+            ExitCodeToString(exit_code),
+            base::TimeDelta::FromSeconds(kHostOfflineReasonTimeoutSeconds));
+      }
       ShutdownOnNetworkThread();
       break;
 
     case HOST_STARTED:
       state_ = HOST_STOPPING;
-      heartbeat_sender_->SetHostOfflineReason(
-          ExitCodeToString(exit_code), base::Bind(base::DoNothing));
-      ScheduleHostShutdown();
+      host_signaling_manager_.release()->SendHostOfflineReasonAndDelete(
+          ExitCodeToString(exit_code),
+          base::TimeDelta::FromSeconds(kHostOfflineReasonTimeoutSeconds));
+      ShutdownOnNetworkThread();
       break;
 
     case HOST_STOPPING_TO_RESTART:
@@ -1388,28 +1380,17 @@ void HostProcess::ShutdownHost(HostExitCodes exit_code) {
   }
 }
 
-// TODO(weitaosu): shut down the host once we get an ACK for the offline status
-//                  XMPP message.
-void HostProcess::ScheduleHostShutdown() {
-  // Delay the shutdown by 2 second to allow SendOfflineStatus to complete.
-  context_->network_task_runner()->PostDelayedTask(
-      FROM_HERE,
-      base::Bind(&HostProcess::ShutdownOnNetworkThread, base::Unretained(this)),
-      base::TimeDelta::FromSeconds(2));
-}
-
 void HostProcess::ShutdownOnNetworkThread() {
   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
 
+  // Need to invalidate WeakPtrs on the same thread where they are dereferenced.
+  weak_factory_for_network_task_runner_.InvalidateWeakPtrs();
+
   host_.reset();
   host_event_logger_.reset();
   host_status_logger_.reset();
-  heartbeat_sender_.reset();
+  host_signaling_manager_.reset();
   host_change_notification_listener_.reset();
-  signaling_connector_.reset();
-  oauth_token_getter_.reset();
-  signal_strategy_.reset();
-  network_change_notifier_.reset();
 
   if (state_ == HOST_STOPPING_TO_RESTART) {
     StartHost();