components/domain_reliability/context.cc

   1 // Copyright 2014 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 "components/domain_reliability/context.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/bind.h"
  10 #include "base/json/json_writer.h"
  11 #include "base/logging.h"
  12 #include "base/metrics/histogram.h"
  13 #include "base/metrics/sparse_histogram.h"
  14 #include "base/values.h"
  15 #include "components/domain_reliability/dispatcher.h"
  16 #include "components/domain_reliability/uploader.h"
  17 #include "components/domain_reliability/util.h"
  18 #include "net/base/net_errors.h"
  19 #include "net/url_request/url_request_context_getter.h"
  20
  21 using base::DictionaryValue;
  22 using base::ListValue;
  23 using base::Value;
  24
  25 namespace domain_reliability {
  26
  27 namespace {
  28 typedef std::deque<DomainReliabilityBeacon> BeaconDeque;
  29 typedef BeaconDeque::iterator BeaconIterator;
  30 typedef BeaconDeque::const_iterator BeaconConstIterator;
  31 }  // namespace
  32
  33 class DomainReliabilityContext::ResourceState {
  34  public:
  35   ResourceState(DomainReliabilityContext* context,
  36                 const DomainReliabilityConfig::Resource* config)
  37       : context(context),
  38         config(config),
  39         successful_requests(0),
  40         failed_requests(0),
  41         uploading_successful_requests(0),
  42         uploading_failed_requests(0) {}
  43   ~ResourceState() {}
  44
  45   // Serializes the resource state into a Value to be included in an upload.
  46   // If there is nothing to report (no beacons and all request counters are 0),
  47   // returns a scoped_ptr to NULL instead so the resource can be omitted.
  48   scoped_ptr<base::Value> ToValue(base::TimeTicks upload_time) const {
  49     if (successful_requests == 0 && failed_requests == 0)
  50       return scoped_ptr<base::Value>();
  51
  52     DictionaryValue* resource_value = new DictionaryValue();
  53     resource_value->SetString("name", config->name);
  54     resource_value->SetInteger("successful_requests", successful_requests);
  55     resource_value->SetInteger("failed_requests", failed_requests);
  56
  57     return scoped_ptr<Value>(resource_value);
  58   }
  59
  60   // Remembers the current state of the resource data when an upload starts.
  61   void MarkUpload() {
  62     DCHECK_EQ(0u, uploading_successful_requests);
  63     DCHECK_EQ(0u, uploading_failed_requests);
  64     uploading_successful_requests = successful_requests;
  65     uploading_failed_requests = failed_requests;
  66   }
  67
  68   // Uses the state remembered by |MarkUpload| to remove successfully uploaded
  69   // data but keep beacons and request counts added after the upload started.
  70   void CommitUpload() {
  71     successful_requests -= uploading_successful_requests;
  72     failed_requests -= uploading_failed_requests;
  73     uploading_successful_requests = 0;
  74     uploading_failed_requests = 0;
  75   }
  76
  77   void RollbackUpload() {
  78     uploading_successful_requests = 0;
  79     uploading_failed_requests = 0;
  80   }
  81
  82   DomainReliabilityContext* context;
  83   const DomainReliabilityConfig::Resource* config;
  84
  85   uint32 successful_requests;
  86   uint32 failed_requests;
  87
  88   // State saved during uploads; if an upload succeeds, these are used to
  89   // remove uploaded data from the beacon list and request counters.
  90   uint32 uploading_successful_requests;
  91   uint32 uploading_failed_requests;
  92
  93  private:
  94   DISALLOW_COPY_AND_ASSIGN(ResourceState);
  95 };
  96
  97 // static
  98 const size_t DomainReliabilityContext::kMaxQueuedBeacons = 150;
  99
 100 DomainReliabilityContext::DomainReliabilityContext(
 101     MockableTime* time,
 102     const DomainReliabilityScheduler::Params& scheduler_params,
 103     const std::string& upload_reporter_string,
 104     const base::TimeTicks* last_network_change_time,
 105     DomainReliabilityDispatcher* dispatcher,
 106     DomainReliabilityUploader* uploader,
 107     scoped_ptr<const DomainReliabilityConfig> config)
 108     : config_(config.Pass()),
 109       time_(time),
 110       upload_reporter_string_(upload_reporter_string),
 111       scheduler_(time,
 112                  config_->collectors.size(),
 113                  scheduler_params,
 114                  base::Bind(&DomainReliabilityContext::ScheduleUpload,
 115                             base::Unretained(this))),
 116       dispatcher_(dispatcher),
 117       uploader_(uploader),
 118       uploading_beacons_size_(0),
 119       last_network_change_time_(last_network_change_time),
 120       weak_factory_(this) {
 121   InitializeResourceStates();
 122 }
 123
 124 DomainReliabilityContext::~DomainReliabilityContext() {}
 125
 126 void DomainReliabilityContext::OnBeacon(const GURL& url,
 127                                         const DomainReliabilityBeacon& beacon) {
 128   size_t index = config_->GetResourceIndexForUrl(url);
 129   if (index == DomainReliabilityConfig::kInvalidResourceIndex)
 130     return;
 131   DCHECK_GT(states_.size(), index);
 132
 133   bool success = (beacon.status == "ok");
 134
 135   ResourceState* state = states_[index];
 136   if (success)
 137     ++state->successful_requests;
 138   else
 139     ++state->failed_requests;
 140
 141   bool reported = false;
 142   bool evicted = false;
 143   if (state->config->DecideIfShouldReportRequest(success)) {
 144     beacons_.push_back(beacon);
 145     beacons_.back().resource = state->config->name;
 146     if (beacons_.size() > kMaxQueuedBeacons) {
 147       RemoveOldestBeacon();
 148       evicted = true;
 149     }
 150     scheduler_.OnBeaconAdded();
 151     reported = true;
 152     UMA_HISTOGRAM_SPARSE_SLOWLY("DomainReliability.ReportedBeaconError",
 153                                 -beacon.chrome_error);
 154     // TODO(ttuttle): Histogram HTTP response code?
 155   }
 156
 157   UMA_HISTOGRAM_BOOLEAN("DomainReliability.BeaconReported", reported);
 158   UMA_HISTOGRAM_BOOLEAN("DomainReliability.OnBeaconDidEvict", evicted);
 159 }
 160
 161 void DomainReliabilityContext::ClearBeacons() {
 162   ResourceStateVector::iterator it;
 163   for (it = states_.begin(); it != states_.end(); ++it) {
 164     ResourceState* state = *it;
 165     state->successful_requests = 0;
 166     state->failed_requests = 0;
 167     state->uploading_successful_requests = 0;
 168     state->uploading_failed_requests = 0;
 169   }
 170   beacons_.clear();
 171   uploading_beacons_size_ = 0;
 172 }
 173
 174 scoped_ptr<base::Value> DomainReliabilityContext::GetWebUIData() const {
 175   base::DictionaryValue* context_value = new base::DictionaryValue();
 176
 177   context_value->SetString("domain", config().domain);
 178   context_value->SetInteger("beacon_count", static_cast<int>(beacons_.size()));
 179   context_value->SetInteger("uploading_beacon_count",
 180       static_cast<int>(uploading_beacons_size_));
 181   context_value->Set("scheduler", scheduler_.GetWebUIData());
 182
 183   return scoped_ptr<base::Value>(context_value);
 184 }
 185
 186 void DomainReliabilityContext::GetQueuedBeaconsForTesting(
 187     std::vector<DomainReliabilityBeacon>* beacons_out) const {
 188   beacons_out->assign(beacons_.begin(), beacons_.end());
 189 }
 190
 191 void DomainReliabilityContext::GetRequestCountsForTesting(
 192     size_t resource_index,
 193     uint32_t* successful_requests_out,
 194     uint32_t* failed_requests_out) const {
 195   DCHECK_NE(DomainReliabilityConfig::kInvalidResourceIndex, resource_index);
 196   DCHECK_GT(states_.size(), resource_index);
 197
 198   const ResourceState& state = *states_[resource_index];
 199   *successful_requests_out = state.successful_requests;
 200   *failed_requests_out = state.failed_requests;
 201 }
 202
 203 void DomainReliabilityContext::InitializeResourceStates() {
 204   ScopedVector<DomainReliabilityConfig::Resource>::const_iterator it;
 205   for (it = config_->resources.begin(); it != config_->resources.end(); ++it)
 206     states_.push_back(new ResourceState(this, *it));
 207 }
 208
 209 void DomainReliabilityContext::ScheduleUpload(
 210     base::TimeDelta min_delay,
 211     base::TimeDelta max_delay) {
 212   dispatcher_->ScheduleTask(
 213       base::Bind(
 214           &DomainReliabilityContext::StartUpload,
 215           weak_factory_.GetWeakPtr()),
 216       min_delay,
 217       max_delay);
 218 }
 219
 220 void DomainReliabilityContext::StartUpload() {
 221   MarkUpload();
 222
 223   DCHECK(upload_time_.is_null());
 224   upload_time_ = time_->NowTicks();
 225   std::string report_json;
 226   scoped_ptr<const Value> report_value(CreateReport(upload_time_));
 227   base::JSONWriter::Write(report_value.get(), &report_json);
 228   report_value.reset();
 229
 230   size_t collector_index = scheduler_.OnUploadStart();
 231
 232   uploader_->UploadReport(
 233       report_json,
 234       config_->collectors[collector_index]->upload_url,
 235       base::Bind(
 236           &DomainReliabilityContext::OnUploadComplete,
 237           weak_factory_.GetWeakPtr()));
 238
 239   UMA_HISTOGRAM_SPARSE_SLOWLY("DomainReliability.UploadCollectorIndex",
 240                               static_cast<int>(collector_index));
 241   if (!last_upload_time_.is_null()) {
 242     UMA_HISTOGRAM_LONG_TIMES("DomainReliability.UploadInterval",
 243                              upload_time_ - last_upload_time_);
 244   }
 245 }
 246
 247 void DomainReliabilityContext::OnUploadComplete(
 248     const DomainReliabilityUploader::UploadResult& result) {
 249   if (result.is_success())
 250     CommitUpload();
 251   else
 252     RollbackUpload();
 253   scheduler_.OnUploadComplete(result);
 254   UMA_HISTOGRAM_BOOLEAN("DomainReliability.UploadSuccess",
 255       result.is_success());
 256   DCHECK(!upload_time_.is_null());
 257   UMA_HISTOGRAM_MEDIUM_TIMES("DomainReliability.UploadDuration",
 258                              time_->NowTicks() - upload_time_);
 259   last_upload_time_ = upload_time_;
 260   upload_time_ = base::TimeTicks();
 261 }
 262
 263 scoped_ptr<const Value> DomainReliabilityContext::CreateReport(
 264     base::TimeTicks upload_time) const {
 265   scoped_ptr<ListValue> beacons_value(new ListValue());
 266   for (BeaconConstIterator it = beacons_.begin(); it != beacons_.end(); ++it)
 267     beacons_value->Append(it->ToValue(upload_time, *last_network_change_time_));
 268
 269   scoped_ptr<ListValue> resources_value(new ListValue());
 270   for (ResourceStateIterator it = states_.begin(); it != states_.end(); ++it) {
 271     scoped_ptr<Value> resource_report = (*it)->ToValue(upload_time);
 272     if (resource_report)
 273       resources_value->Append(resource_report.release());
 274   }
 275
 276   DictionaryValue* report_value = new DictionaryValue();
 277   if (!config().version.empty())
 278     report_value->SetString("config_version", config().version);
 279   report_value->SetString("reporter", upload_reporter_string_);
 280   report_value->Set("entries", beacons_value.release());
 281   if (!resources_value->empty())
 282     report_value->Set("resources", resources_value.release());
 283
 284   return scoped_ptr<const Value>(report_value);
 285 }
 286
 287 void DomainReliabilityContext::MarkUpload() {
 288   for (ResourceStateIterator it = states_.begin(); it != states_.end(); ++it)
 289     (*it)->MarkUpload();
 290   DCHECK_EQ(0u, uploading_beacons_size_);
 291   uploading_beacons_size_ = beacons_.size();
 292   DCHECK_NE(0u, uploading_beacons_size_);
 293 }
 294
 295 void DomainReliabilityContext::CommitUpload() {
 296   for (ResourceStateIterator it = states_.begin(); it != states_.end(); ++it)
 297     (*it)->CommitUpload();
 298   BeaconIterator begin = beacons_.begin();
 299   BeaconIterator end = begin + uploading_beacons_size_;
 300   beacons_.erase(begin, end);
 301   DCHECK_NE(0u, uploading_beacons_size_);
 302   uploading_beacons_size_ = 0;
 303 }
 304
 305 void DomainReliabilityContext::RollbackUpload() {
 306   for (ResourceStateIterator it = states_.begin(); it != states_.end(); ++it)
 307     (*it)->RollbackUpload();
 308   DCHECK_NE(0u, uploading_beacons_size_);
 309   uploading_beacons_size_ = 0;
 310 }
 311
 312 void DomainReliabilityContext::RemoveOldestBeacon() {
 313   DCHECK(!beacons_.empty());
 314
 315   VLOG(1) << "Beacon queue for " << config().domain << " full; "
 316           << "removing oldest beacon";
 317
 318   beacons_.pop_front();
 319
 320   // If that just removed a beacon counted in uploading_beacons_size_, decrement
 321   // that.
 322   if (uploading_beacons_size_ > 0)
 323     --uploading_beacons_size_;
 324 }
 325
 326 }  // namespace domain_reliability