content/browser/histogram_internals_request_job.cc

   1 // Copyright (c) 2012 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 "content/browser/histogram_internals_request_job.h"
   6
   7 #include "base/metrics/histogram.h"
   8 #include "base/metrics/statistics_recorder.h"
   9 #include "content/browser/histogram_synchronizer.h"
  10 #include "net/base/escape.h"
  11 #include "net/base/net_errors.h"
  12 #include "net/url_request/url_request.h"
  13 #include "url/gurl.h"
  14
  15 namespace content {
  16
  17 HistogramInternalsRequestJob::HistogramInternalsRequestJob(
  18     net::URLRequest* request, net::NetworkDelegate* network_delegate)
  19     : net::URLRequestSimpleJob(request, network_delegate) {
  20   const std::string& spec = request->url().possibly_invalid_spec();
  21   const url::Parsed& parsed = request->url().parsed_for_possibly_invalid_spec();
  22   // + 1 to skip the slash at the beginning of the path.
  23   int offset = parsed.CountCharactersBefore(url::Parsed::PATH, false) + 1;
  24
  25   if (offset < static_cast<int>(spec.size()))
  26     path_.assign(spec.substr(offset));
  27 }
  28
  29 void AboutHistogram(std::string* data, const std::string& path) {
  30   HistogramSynchronizer::FetchHistograms();
  31
  32   std::string unescaped_query;
  33   std::string unescaped_title("About Histograms");
  34   if (!path.empty()) {
  35     unescaped_query = net::UnescapeURLComponent(path,
  36                                                 net::UnescapeRule::NORMAL);
  37     unescaped_title += " - " + unescaped_query;
  38   }
  39
  40   data->append("<!DOCTYPE html>\n<html>\n<head>\n");
  41   data->append(
  42       "<meta http-equiv=\"Content-Security-Policy\" "
  43       "content=\"object-src 'none'; script-src 'none'\">");
  44   data->append("<title>");
  45   data->append(net::EscapeForHTML(unescaped_title));
  46   data->append("</title>\n");
  47   data->append("</head><body>");
  48
  49   // Display any stats for which we sent off requests the last time.
  50   data->append("<p>Stats accumulated from browser startup to previous ");
  51   data->append("page load; reload to get stats as of this page load.</p>\n");
  52   data->append("<table width=\"100%\">\n");
  53
  54   base::StatisticsRecorder::WriteHTMLGraph(unescaped_query, data);
  55 }
  56
  57 int HistogramInternalsRequestJob::GetData(
  58     std::string* mime_type,
  59     std::string* charset,
  60     std::string* data,
  61     const net::CompletionCallback& callback) const {
  62   mime_type->assign("text/html");
  63   charset->assign("UTF8");
  64
  65   data->clear();
  66   AboutHistogram(data, path_);
  67   return net::OK;
  68 }
  69
  70 }  // namespace content