Upload UMA data using protocol buffers.

chrome/browser/metrics/metrics_service.cc

 // Copyright (c) 2012 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.
 
 //------------------------------------------------------------------------------
 // Description of the life cycle of a instance of MetricsService.
 //
 //  OVERVIEW
 //
 // A MetricsService instance is typically created at application startup.  It
@@ skipping 164 matching lines @@
 #include "chrome/common/guid.h"
 #include "chrome/common/metrics/metrics_log_manager.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/render_messages.h"
 #include "content/browser/load_notification_details.h"
 #include "content/public/browser/child_process_data.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/plugin_service.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/common/url_fetcher.h"
+#include "net/base/load_flags.h"
 #include "webkit/plugins/webplugininfo.h"
 
 // TODO(port): port browser_distribution.h.
 #if !defined(OS_POSIX)
 #include "chrome/installer/util/browser_distribution.h"
 #endif
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/cros/cros_library.h"
 #include "chrome/browser/chromeos/external_metrics.h"
 #include "chrome/browser/chromeos/system/statistics_provider.h"
 #endif
 
 using base::Time;
 using content::BrowserThread;
 using content::ChildProcessData;
 using content::PluginService;
 
+namespace {
+
 // Check to see that we're being called on only one thread.
-static bool IsSingleThreaded();
+bool IsSingleThreaded() {
+  static base::PlatformThreadId thread_id = 0;
+  if (!thread_id)
+    thread_id = base::PlatformThread::CurrentId();
+  return base::PlatformThread::CurrentId() == thread_id;
+}
 
-static const char kMetricsType[] = "application/vnd.mozilla.metrics.bz2";
+const char kMetricsTypeXml[] = "application/vnd.mozilla.metrics.bz2";
+const char kMetricsTypeProto[] = "application/vnd.chrome.uma";
+
+const char kServerUrlXml[] =
+    "https://clients4.google.com/firefox/metrics/collect";
+const char kServerUrlProto[] = "https://clients4.google.com/uma/v2";
 
 // The delay, in seconds, after starting recording before doing expensive
 // initialization work.
-static const int kInitializationDelaySeconds = 30;
+const int kInitializationDelaySeconds = 30;

[Nico, 2012/02/29 02:53:06]

const has implicit internal linkage no need to make it static or to put it into
an unnamed namespace

 
 // This specifies the amount of time to wait for all renderers to send their
 // data.
-static const int kMaxHistogramGatheringWaitDuration = 60000;  // 60 seconds.
+const int kMaxHistogramGatheringWaitDuration = 60000;  // 60 seconds.
 
 // The maximum number of events in a log uploaded to the UMA server.
-static const int kEventLimit = 2400;
+const int kEventLimit = 2400;
 
 // If an upload fails, and the transmission was over this byte count, then we
 // will discard the log, and not try to retransmit it.  We also don't persist
 // the log to the prefs for transmission during the next chrome session if this
 // limit is exceeded.
-static const int kUploadLogAvoidRetransmitSize = 50000;
+const size_t kUploadLogAvoidRetransmitSize = 50000;
 
 // Interval, in minutes, between state saves.
-static const int kSaveStateIntervalMinutes = 5;
+const int kSaveStateIntervalMinutes = 5;
+
+}
 
 // static
 MetricsService::ShutdownCleanliness MetricsService::clean_shutdown_status_ =
     MetricsService::CLEANLY_SHUTDOWN;
 
 // This is used to quickly log stats from child process related notifications in
 // MetricsService::child_stats_buffer_.  The buffer's contents are transferred
 // out when Local State is periodically saved.  The information is then
 // reported to the UMA server on next launch.
 struct MetricsService::ChildProcessStats {
@@ skipping 79 matching lines @@
                                    0);
 #endif  // OS_CHROMEOS
 
   local_state->RegisterDictionaryPref(prefs::kProfileMetrics);
   local_state->RegisterIntegerPref(prefs::kNumBookmarksOnBookmarkBar, 0);
   local_state->RegisterIntegerPref(prefs::kNumFoldersOnBookmarkBar, 0);
   local_state->RegisterIntegerPref(prefs::kNumBookmarksInOtherBookmarkFolder,
                                    0);
   local_state->RegisterIntegerPref(prefs::kNumFoldersInOtherBookmarkFolder, 0);
   local_state->RegisterIntegerPref(prefs::kNumKeywords, 0);
-  local_state->RegisterListPref(prefs::kMetricsInitialLogs);
-  local_state->RegisterListPref(prefs::kMetricsOngoingLogs);
+  local_state->RegisterListPref(prefs::kMetricsInitialLogsXml);
+  local_state->RegisterListPref(prefs::kMetricsOngoingLogsXml);
+  local_state->RegisterListPref(prefs::kMetricsInitialLogsProto);
+  local_state->RegisterListPref(prefs::kMetricsOngoingLogsProto);
 
   local_state->RegisterInt64Pref(prefs::kUninstallMetricsPageLoadCount, 0);
   local_state->RegisterInt64Pref(prefs::kUninstallLaunchCount, 0);
   local_state->RegisterInt64Pref(prefs::kUninstallMetricsInstallDate, 0);
   local_state->RegisterInt64Pref(prefs::kUninstallMetricsUptimeSec, 0);
   local_state->RegisterInt64Pref(prefs::kUninstallLastLaunchTimeSec, 0);
   local_state->RegisterInt64Pref(prefs::kUninstallLastObservedRunTimeSec, 0);
 }
 
 // static
@@ skipping 12 matching lines @@
 
   local_state->SetInteger(prefs::kStabilityPageLoadCount, 0);
   local_state->SetInteger(prefs::kStabilityRendererCrashCount, 0);
   local_state->SetInteger(prefs::kStabilityRendererHangCount, 0);
 
   local_state->SetInt64(prefs::kStabilityLaunchTimeSec, 0);
   local_state->SetInt64(prefs::kStabilityLastTimestampSec, 0);
 
   local_state->ClearPref(prefs::kStabilityPluginStats);
 
-  local_state->ClearPref(prefs::kMetricsInitialLogs);
-  local_state->ClearPref(prefs::kMetricsOngoingLogs);
+  local_state->ClearPref(prefs::kMetricsInitialLogsXml);
+  local_state->ClearPref(prefs::kMetricsOngoingLogsXml);
+  local_state->ClearPref(prefs::kMetricsInitialLogsProto);
+  local_state->ClearPref(prefs::kMetricsOngoingLogsProto);
 }
 
 MetricsService::MetricsService()
     : recording_active_(false),
       reporting_active_(false),
       state_(INITIALIZED),
-      current_fetch_(NULL),
       io_thread_(NULL),
       idle_since_last_transmission_(false),
       next_window_id_(0),
       ALLOW_THIS_IN_INITIALIZER_LIST(self_ptr_factory_(this)),
       ALLOW_THIS_IN_INITIALIZER_LIST(state_saver_factory_(this)),
       waiting_for_asynchronus_reporting_step_(false) {
   DCHECK(IsSingleThreaded());
   InitializeMetricsState();
 
   base::Closure callback = base::Bind(&MetricsService::StartScheduledUpload,
@@ skipping 242 matching lines @@
 //------------------------------------------------------------------------------
 // private methods
 //------------------------------------------------------------------------------
 
 
 //------------------------------------------------------------------------------
 // Initialization methods
 
 void MetricsService::InitializeMetricsState() {
 #if defined(OS_POSIX)
-  server_url_ = L"https://clients4.google.com/firefox/metrics/collect";
+  server_url_xml_ = ASCIIToUTF16(kServerUrlXml);
+  server_url_proto_ = ASCIIToUTF16(kServerUrlProto);
   network_stats_server_ = "chrome.googleechotest.com";
 #else
   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
-  server_url_ = dist->GetStatsServerURL();
+  server_url_xml_ = dist->GetStatsServerURL();
+  server_url_proto_ = ASCIIToUTF16(kServerUrlProto);
   network_stats_server_ = dist->GetNetworkStatsServer();
 #endif
 
   PrefService* pref = g_browser_process->local_state();
   DCHECK(pref);
 
   if ((pref->GetInt64(prefs::kStabilityStatsBuildTime)
        != MetricsLog::GetBuildTime()) ||
       (pref->GetString(prefs::kStabilityStatsVersion)
        != MetricsLog::GetVersionString())) {
@@ skipping 187 matching lines @@
   // Adds to ongoing logs.
   log_manager_.current_log()->set_hardware_class(hardware_class_);
 
   // Put incremental data (histogram deltas, and realtime stats deltas) at the
   // end of all log transmissions (initial log handles this separately).
   // RecordIncrementalStabilityElements only exists on the derived
   // MetricsLog class.
   MetricsLog* current_log =
       static_cast<MetricsLog*>(log_manager_.current_log());
   DCHECK(current_log);
-  current_log->RecordIncrementalStabilityElements();
+  current_log->RecordIncrementalStabilityElements(plugins_);
   RecordCurrentHistograms();
 
   log_manager_.StageCurrentLogForUpload();
 }
 
 void MetricsService::PushPendingLogsToPersistentStorage() {
   if (state_ < INITIAL_LOG_READY)
     return;  // We didn't and still don't have time to get plugin list etc.
 
   if (log_manager_.has_staged_log()) {
@@ skipping 74 matching lines @@
       MessageLoop::current(), callback,
       kMaxHistogramGatheringWaitDuration);
 }
 
 void MetricsService::OnHistogramSynchronizationDone() {
   DCHECK(IsSingleThreaded());
 
   // If somehow there is a fetch in progress, we return and hope things work
   // out. The scheduler isn't informed since if this happens, the scheduler
   // will get a response from the upload.
-  DCHECK(!current_fetch_.get());
-  if (current_fetch_.get())
+  DCHECK(!current_fetch_xml_.get());
+  DCHECK(!current_fetch_proto_.get());
+  if (current_fetch_xml_.get() || current_fetch_proto_.get())
     return;
 
   // This function should only be called as the callback from an ansynchronous
   // step.
   DCHECK(waiting_for_asynchronus_reporting_step_);
   waiting_for_asynchronus_reporting_step_ = false;
 
   // If we're getting no notifications, then the log won't have much in it, and
   // it's possible the computer is about to go to sleep, so don't upload and
   // stop the scheduler.
   // Similarly, if logs should no longer be uploaded, stop here.
   if (idle_since_last_transmission_ ||
       !recording_active() || !reporting_active()) {
     scheduler_->Stop();
     scheduler_->UploadCancelled();
     return;
   }
 
   MakeStagedLog();
 
   // MakeStagedLog should have prepared log text; if it didn't, skip this
   // upload and hope things work out next time.
   if (log_manager_.staged_log_text().empty()) {
     scheduler_->UploadCancelled();
     return;
   }
 
   PrepareFetchWithStagedLog();
 
-  if (!current_fetch_.get()) {
+  if (!current_fetch_xml_.get()) {
+    DCHECK(!current_fetch_proto_.get());
     // Compression failed, and log discarded :-/.
     log_manager_.DiscardStagedLog();
     scheduler_->UploadCancelled();
     // TODO(jar): If compression failed, we should have created a tiny log and
     // compressed that, so that we can signal that we're losing logs.
     return;
   }
+  // Currently, the staged log for the protobuf version of the data is discarded
+  // after we create the URL request, so that there is no chance for
+  // re-transmission in case the corresponding XML request fails.  We will
+  // handle protobuf failures more carefully once that becomes the main
+  // pipeline, i.e. once we switch away from the XML pipeline.
+  DCHECK(current_fetch_proto_.get() || !log_manager_.has_staged_log_proto());
 
   DCHECK(!waiting_for_asynchronus_reporting_step_);
 
   waiting_for_asynchronus_reporting_step_ = true;
-  current_fetch_->Start();
+  current_fetch_xml_->Start();
+  if (current_fetch_proto_.get())
+    current_fetch_proto_->Start();
 
   HandleIdleSinceLastTransmission(true);
 }
 
 
 void MetricsService::MakeStagedLog() {
   if (log_manager_.has_staged_log())
     return;
 
   switch (state_) {
@@ skipping 53 matching lines @@
 
 void MetricsService::StoreUnsentLogs() {
   if (state_ < INITIAL_LOG_READY)
     return;  // We never Recalled the prior unsent logs.
 
   log_manager_.PersistUnsentLogs();
 }
 
 void MetricsService::PrepareFetchWithStagedLog() {
   DCHECK(!log_manager_.staged_log_text().empty());
-  DCHECK(!current_fetch_.get());
 
-  current_fetch_.reset(content::URLFetcher::Create(
-      GURL(WideToUTF16(server_url_)), content::URLFetcher::POST, this));
-  current_fetch_->SetRequestContext(
+  // Prepare the XML version.
+  DCHECK(!current_fetch_xml_.get());
+  current_fetch_xml_.reset(content::URLFetcher::Create(
+      GURL(server_url_xml_), content::URLFetcher::POST, this));
+  current_fetch_xml_->SetRequestContext(
       g_browser_process->system_request_context());
-  current_fetch_->SetUploadData(kMetricsType, log_manager_.staged_log_text());
+  current_fetch_xml_->SetUploadData(kMetricsTypeXml,
+                                    log_manager_.staged_log_text().xml);
+  // We already drop cookies server-side, but we might as well strip them out
+  // client-side as well.
+  current_fetch_xml_->SetLoadFlags(net::LOAD_DO_NOT_SAVE_COOKIES |
+                                   net::LOAD_DO_NOT_SEND_COOKIES);
+
+  // Prepare the protobuf version.
+  DCHECK(!current_fetch_proto_.get());
+  if (log_manager_.has_staged_log_proto()) {
+    current_fetch_proto_.reset(content::URLFetcher::Create(
+        GURL(server_url_proto_), content::URLFetcher::POST, this));
+    current_fetch_proto_->SetRequestContext(
+        g_browser_process->system_request_context());
+    current_fetch_proto_->SetUploadData(kMetricsTypeProto,
+                                        log_manager_.staged_log_text().proto);
+    // We already drop cookies server-side, but we might as well strip them out
+    // client-side as well.
+    current_fetch_proto_->SetLoadFlags(net::LOAD_DO_NOT_SAVE_COOKIES |
+                                       net::LOAD_DO_NOT_SEND_COOKIES);
+
+    // Discard the protobuf version of the staged log, so that we will avoid
+    // re-uploading it even if we need to re-upload the XML version.
+    // TODO(isherman): Handle protobuf upload failures more gracefully once we
+    // transition away from the XML-based pipeline.
+    log_manager_.DiscardStagedLogProto();
+  }
 }
 
 static const char* StatusToString(const net::URLRequestStatus& status) {
   switch (status.status()) {
     case net::URLRequestStatus::SUCCESS:
       return "SUCCESS";
 
     case net::URLRequestStatus::IO_PENDING:
       return "IO_PENDING";
 
     case net::URLRequestStatus::HANDLED_EXTERNALLY:
       return "HANDLED_EXTERNALLY";
 
     case net::URLRequestStatus::CANCELED:
       return "CANCELED";
 
     case net::URLRequestStatus::FAILED:
       return "FAILED";
 
     default:
       NOTREACHED();
       return "Unknown";
   }
 }
 
+// We need to wait for two responses: the response to the XML upload, and the
+// response to the protobuf upload.  For now, only the XML upload's response
+// affects decisions like whether to retry the upload, whether to abandon the
+// upload because it is too large, etc.  However, we still need to wait for the
+// protobuf upload, as we cannot reset |current_fetch_proto_| until we have
+// confirmation that the network request was sent; and the easiest way to do
+// that is to wait for the response.  In case the XML upload's response arrives
+// first, we cache that response until the protobuf upload's response also
+// arrives.
+//
+// Note that if the XML upload succeeds but the protobuf upload fails, we will
+// not retry the protobuf upload.  If the XML upload fails while the protobuf
+// upload succeeds, we will still avoid re-uploading the protobuf data because
+// we "zap" the data after the first upload attempt.  This means that we might
+// lose protobuf uploads when XML ones succeed; but we will never duplicate any
+// protobuf uploads.  Protobuf failures should be rare enough to where this
+// should be ok while we have the two pipelines running in parallel.
 void MetricsService::OnURLFetchComplete(const content::URLFetcher* source) {
   DCHECK(waiting_for_asynchronus_reporting_step_);
+
+  // We're not allowed to re-use the existing |URLFetcher|s, so free them here.
+  scoped_ptr<content::URLFetcher> s;
+  if (source == current_fetch_xml_.get()) {
+    s.reset(current_fetch_xml_.release());
+
+    // Cache the XML responses, in case we still need to wait for the protobuf
+    // response.
+    response_code_ = source->GetResponseCode();
+    response_status_ = StatusToString(source->GetStatus());
+    source->GetResponseAsString(&response_data_);
+  } else if (source == current_fetch_proto_.get()) {
+    s.reset(current_fetch_proto_.release());
+  } else {
+    NOTREACHED();
+    return;
+  }
+
+  // If we're still waiting for one of the responses, keep waiting...
+  if (current_fetch_xml_.get() || current_fetch_proto_.get())
+    return;
+
+  // We should only be able to reach here once we've received responses to both
+  // the XML and the protobuf requests.  We should always have the response code
+  // available.
+  DCHECK_NE(response_code_, content::URLFetcher::RESPONSE_CODE_INVALID);
   waiting_for_asynchronus_reporting_step_ = false;
-  DCHECK(current_fetch_.get());
-  // We're not allowed to re-use it. Delete it on function exit since we use it.
-  scoped_ptr<content::URLFetcher> s(current_fetch_.release());
+
 
   // Confirm send so that we can move on.
-  VLOG(1) << "METRICS RESPONSE CODE: " << source->GetResponseCode()
-          << " status=" << StatusToString(source->GetStatus());
+  VLOG(1) << "METRICS RESPONSE CODE: " << response_code_
+          << " status=" << response_status_;
 
-  bool upload_succeeded = source->GetResponseCode() == 200;
+  bool upload_succeeded = response_code_ == 200;
 
   // Provide boolean for error recovery (allow us to ignore response_code).
   bool discard_log = false;
 
   if (!upload_succeeded &&
-      (log_manager_.staged_log_text().length() >
-          static_cast<size_t>(kUploadLogAvoidRetransmitSize))) {
+      log_manager_.staged_log_text().xml.length() >
+          kUploadLogAvoidRetransmitSize) {
     UMA_HISTOGRAM_COUNTS(
         "UMA.Large Rejected Log was Discarded",
-        static_cast<int>(log_manager_.staged_log_text().length()));
+        static_cast<int>(log_manager_.staged_log_text().xml.length()));
     discard_log = true;
-  } else if (source->GetResponseCode() == 400) {
+  } else if (response_code_ == 400) {
     // Bad syntax.  Retransmission won't work.
     UMA_HISTOGRAM_COUNTS("UMA.Unacceptable_Log_Discarded", state_);
     discard_log = true;
   }
 
   if (!upload_succeeded && !discard_log) {
     VLOG(1) << "METRICS: transmission attempt returned a failure code: "
-            << source->GetResponseCode() << ". Verify network connectivity";
+            << response_code_ << ". Verify network connectivity";
     LogBadResponseCode();
   } else {  // Successful receipt (or we are discarding log).
-    std::string data;
-    source->GetResponseAsString(&data);
-    VLOG(1) << "METRICS RESPONSE DATA: " << data;
+    VLOG(1) << "METRICS RESPONSE DATA: " << response_data_;
     switch (state_) {
       case INITIAL_LOG_READY:
         state_ = SENDING_OLD_LOGS;
         break;
 
       case SENDING_OLD_LOGS:
         // Store the updated list to disk now that the removed log is uploaded.
         StoreUnsentLogs();
         break;
 
       case SENDING_CURRENT_LOGS:
         break;
 
       default:
         NOTREACHED();
         break;
     }
 
     log_manager_.DiscardStagedLog();
 
     if (log_manager_.has_unsent_logs())
       DCHECK(state_ < SENDING_CURRENT_LOGS);
   }
 
   // Error 400 indicates a problem with the log, not with the server, so
   // don't consider that a sign that the server is in trouble.
-  bool server_is_healthy = upload_succeeded || source->GetResponseCode() == 400;
+  bool server_is_healthy = upload_succeeded || response_code_ == 400;
 
   scheduler_->UploadFinished(server_is_healthy,
                              log_manager_.has_unsent_logs());
 
   // Collect network stats if UMA upload succeeded.
   if (server_is_healthy && io_thread_)
     chrome_browser_net::CollectNetworkStats(network_stats_server_, io_thread_);
+
+  // Reset the cached response data.
+  response_code_ = content::URLFetcher::RESPONSE_CODE_INVALID;
+  response_data_ = std::string();
+  response_status_ = std::string();
 }
 
 void MetricsService::LogBadResponseCode() {
   VLOG(1) << "Verify your metrics logs are formatted correctly.  Verify server "
-             "is active at " << server_url_;
+             "is active at " << server_url_xml_;
   if (!log_manager_.has_staged_log()) {
     VLOG(1) << "METRICS: Recorder shutdown during log transmission.";
   } else {
     VLOG(1) << "METRICS: transmission retry being scheduled for "
-            << log_manager_.staged_log_text();
+            << log_manager_.staged_log_text().xml;
   }
 }
 
 void MetricsService::LogWindowChange(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   int controller_id = -1;
   uintptr_t window_or_tab = source.map_key();
   MetricsLog::WindowEventType window_type;
@@ skipping 351 matching lines @@
 
   RecordPluginChanges(pref);
 }
 
 // static
 bool MetricsService::IsPluginProcess(content::ProcessType type) {
   return (type == content::PROCESS_TYPE_PLUGIN||
           type == content::PROCESS_TYPE_PPAPI_PLUGIN);
 }
 
-static bool IsSingleThreaded() {
-  static base::PlatformThreadId thread_id = 0;
-  if (!thread_id)
-    thread_id = base::PlatformThread::CurrentId();
-  return base::PlatformThread::CurrentId() == thread_id;
-}
-
 #if defined(OS_CHROMEOS)
 void MetricsService::StartExternalMetrics() {
   external_metrics_ = new chromeos::ExternalMetrics;
   external_metrics_->Start();
 }
 #endif
 
 // static
 bool MetricsServiceHelper::IsMetricsReportingEnabled() {
   bool result = false;
   const PrefService* local_state = g_browser_process->local_state();
   if (local_state) {
     const PrefService::Preference* uma_pref =
         local_state->FindPreference(prefs::kMetricsReportingEnabled);
     if (uma_pref) {
       bool success = uma_pref->GetValue()->GetAsBoolean(&result);
       DCHECK(success);
     }
   }
   return result;
 }