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_parse::Parsed& parsed =
  22       request->url().parsed_for_possibly_invalid_spec();
  23   // + 1 to skip the slash at the beginning of the path.
  24   int offset = parsed.CountCharactersBefore(url_parse::Parsed::PATH, false) + 1;
  25
  26   if (offset < static_cast<int>(spec.size()))
  27     path_.assign(spec.substr(offset));
  28 }
  29
  30 void AboutHistogram(std::string* data, const std::string& path) {
  31   HistogramSynchronizer::FetchHistograms();
  32
  33   std::string unescaped_query;
  34   std::string unescaped_title("About Histograms");
  35   if (!path.empty()) {
  36     unescaped_query = net::UnescapeURLComponent(path,
  37                                                 net::UnescapeRule::NORMAL);
  38     unescaped_title += " - " + unescaped_query;
  39   }
  40
  41   data->append("<!DOCTYPE html>\n<html>\n<head>\n");
  42   data->append(
  43       "<meta http-equiv=\"Content-Security-Policy\" "
  44       "content=\"object-src 'none'; script-src 'none'\">");
  45   data->append("<title>");
  46   data->append(net::EscapeForHTML(unescaped_title));
  47   data->append("</title>\n");
  48   data->append("</head><body>");
  49
  50   // Display any stats for which we sent off requests the last time.
  51   data->append("<p>Stats as of last page load;");
  52   data->append("reload to get stats as of this page load.</p>\n");
  53   data->append("<table width=\"100%\">\n");
  54
  55   base::StatisticsRecorder::WriteHTMLGraph(unescaped_query, data);
  56 }
  57
  58 int HistogramInternalsRequestJob::GetData(
  59     std::string* mime_type,
  60     std::string* charset,
  61     std::string* data,
  62     const net::CompletionCallback& callback) const {
  63   mime_type->assign("text/html");
  64   charset->assign("UTF8");
  65
  66   data->clear();
  67   AboutHistogram(data, path_);
  68   return net::OK;
  69 }
  70
  71 }  // namespace content