src/chrome/browser/ui/webui/ntp/ntp_user_data_logger.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/ui/webui/ntp/ntp_user_data_logger.h"
   6
   7 #include "base/metrics/histogram.h"
   8 #include "chrome/browser/search/search.h"
   9 #include "chrome/common/search_urls.h"
  10 #include "chrome/common/url_constants.h"
  11 #include "content/public/browser/navigation_details.h"
  12
  13 DEFINE_WEB_CONTENTS_USER_DATA_KEY(NTPUserDataLogger);
  14
  15 NTPUserDataLogger::~NTPUserDataLogger() {}
  16
  17 void NTPUserDataLogger::EmitThumbnailErrorRate() {
  18   DCHECK_LE(number_of_thumbnail_errors_, number_of_thumbnail_attempts_);
  19   if (number_of_thumbnail_attempts_ != 0) {
  20     UMA_HISTOGRAM_PERCENTAGE(
  21       "NewTabPage.ThumbnailErrorRate",
  22       GetPercentError(number_of_thumbnail_errors_,
  23                       number_of_thumbnail_attempts_));
  24   }
  25   DCHECK_LE(number_of_fallback_thumbnails_used_,
  26             number_of_fallback_thumbnails_requested_);
  27   if (number_of_fallback_thumbnails_requested_ != 0) {
  28     UMA_HISTOGRAM_PERCENTAGE(
  29         "NewTabPage.ThumbnailFallbackRate",
  30         GetPercentError(number_of_fallback_thumbnails_used_,
  31                         number_of_fallback_thumbnails_requested_));
  32   }
  33   number_of_thumbnail_attempts_ = 0;
  34   number_of_thumbnail_errors_ = 0;
  35   number_of_fallback_thumbnails_requested_ = 0;
  36   number_of_fallback_thumbnails_used_ = 0;
  37 }
  38
  39 void NTPUserDataLogger::EmitMouseoverCount() {
  40   UMA_HISTOGRAM_COUNTS("NewTabPage.NumberOfMouseOvers", number_of_mouseovers_);
  41   number_of_mouseovers_ = 0;
  42 }
  43
  44 void NTPUserDataLogger::LogEvent(NTPLoggingEventType event) {
  45   switch (event) {
  46     case NTP_MOUSEOVER:
  47       number_of_mouseovers_++;
  48       break;
  49     case NTP_THUMBNAIL_ATTEMPT:
  50       number_of_thumbnail_attempts_++;
  51       break;
  52     case NTP_THUMBNAIL_ERROR:
  53       number_of_thumbnail_errors_++;
  54       break;
  55     case NTP_FALLBACK_THUMBNAIL_REQUESTED:
  56       number_of_fallback_thumbnails_requested_++;
  57       break;
  58     case NTP_FALLBACK_THUMBNAIL_USED:
  59       number_of_fallback_thumbnails_used_++;
  60       break;
  61     default:
  62       NOTREACHED();
  63   }
  64 }
  65
  66 // content::WebContentsObserver override
  67 void NTPUserDataLogger::NavigationEntryCommitted(
  68     const content::LoadCommittedDetails& load_details) {
  69   if (!load_details.previous_url.is_valid())
  70     return;
  71
  72   if (search::MatchesOriginAndPath(ntp_url_, load_details.previous_url)) {
  73     EmitMouseoverCount();
  74     // Only log thumbnail error rates for Instant NTP pages, as we do not have
  75     // this data for non-Instant NTPs.
  76     if (ntp_url_ != GURL(chrome::kChromeUINewTabURL))
  77       EmitThumbnailErrorRate();
  78   }
  79 }
  80
  81 NTPUserDataLogger::NTPUserDataLogger(content::WebContents* contents)
  82     : content::WebContentsObserver(contents),
  83       number_of_mouseovers_(0),
  84       number_of_thumbnail_attempts_(0),
  85       number_of_thumbnail_errors_(0),
  86       number_of_fallback_thumbnails_requested_(0),
  87       number_of_fallback_thumbnails_used_(0) {
  88 }
  89
  90 size_t NTPUserDataLogger::GetPercentError(size_t errors, size_t events) const {
  91   return (100 * errors) / events;
  92 }