src/components/copresence/rpc/rpc_handler.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/copresence/rpc/rpc_handler.h"
   6
   7 #include <map>
   8
   9 #include "base/bind.h"
  10 #include "base/command_line.h"
  11 #include "base/guid.h"
  12 #include "base/logging.h"
  13 #include "base/strings/string_util.h"
  14 #include "base/time/time.h"
  15 #include "components/copresence/copresence_switches.h"
  16 #include "components/copresence/handlers/directive_handler.h"
  17 #include "components/copresence/proto/codes.pb.h"
  18 #include "components/copresence/proto/data.pb.h"
  19 #include "components/copresence/proto/rpcs.pb.h"
  20 #include "components/copresence/public/copresence_client_delegate.h"
  21 #include "net/http/http_status_code.h"
  22
  23 // TODO(ckehoe): Return error messages for bad requests.
  24
  25 namespace copresence {
  26
  27 using google::protobuf::MessageLite;
  28 using google::protobuf::RepeatedPtrField;
  29
  30 const char RpcHandler::kReportRequestRpcName[] = "report";
  31
  32 namespace {
  33
  34 // UrlSafe is defined as:
  35 // '/' represented by a '_' and '+' represented by a '-'
  36 // TODO(rkc): Move this to the wrapper.
  37 std::string ToUrlSafe(std::string token) {
  38   base::ReplaceChars(token, "+", "-", &token);
  39   base::ReplaceChars(token, "/", "_", &token);
  40   return token;
  41 }
  42
  43 const int kInvalidTokenExpiryTimeMs = 10 * 60 * 1000;  // 10 minutes.
  44 const int kMaxInvalidTokens = 10000;
  45 const char kRegisterDeviceRpcName[] = "registerdevice";
  46 const char kDefaultCopresenceServer[] =
  47     "https://www.googleapis.com/copresence/v2/copresence";
  48
  49 // Logging
  50
  51 // Checks for a copresence error. If there is one, logs it and returns true.
  52 bool CopresenceErrorLogged(const Status& status) {
  53   if (status.code() != OK) {
  54     LOG(ERROR) << "Copresence error code " << status.code()
  55                << (status.message().empty() ? std::string() :
  56                   ": " + status.message());
  57   }
  58   return status.code() != OK;
  59 }
  60
  61 void LogIfErrorStatus(const util::error::Code& code,
  62                       const std::string& context) {
  63   LOG_IF(ERROR, code != util::error::OK)
  64       << context << " error " << code << ". See "
  65       << "cs/google3/util/task/codes.proto for more info.";
  66 }
  67
  68 // If any errors occurred, logs them and returns true.
  69 bool ReportErrorLogged(const ReportResponse& response) {
  70   bool result = CopresenceErrorLogged(response.header().status());
  71
  72   // The Report fails or succeeds as a unit. If any responses had errors,
  73   // the header will too. Thus we don't need to propagate individual errors.
  74   if (response.has_update_signals_response())
  75     LogIfErrorStatus(response.update_signals_response().status(), "Update");
  76   if (response.has_manage_messages_response())
  77     LogIfErrorStatus(response.manage_messages_response().status(), "Publish");
  78   if (response.has_manage_subscriptions_response()) {
  79     LogIfErrorStatus(response.manage_subscriptions_response().status(),
  80                      "Subscribe");
  81   }
  82
  83   return result;
  84 }
  85
  86 // Request construction
  87 // TODO(ckehoe): Move these into a separate file?
  88
  89 template <typename T>
  90 BroadcastScanConfiguration GetBroadcastScanConfig(const T& msg) {
  91   if (msg.has_token_exchange_strategy() &&
  92       msg.token_exchange_strategy().has_broadcast_scan_configuration()) {
  93     return msg.token_exchange_strategy().broadcast_scan_configuration();
  94   }
  95   return BROADCAST_SCAN_CONFIGURATION_UNKNOWN;
  96 }
  97
  98 // This method will extract token exchange strategies
  99 // from the publishes and subscribes in a report request.
 100 // TODO(ckehoe): Delete this when the server supports
 101 // BroadcastScanConfiguration.
 102 BroadcastScanConfiguration ExtractTokenExchangeStrategy(
 103     const ReportRequest& request) {
 104   bool broadcast_only = false;
 105   bool scan_only = false;
 106
 107   // Strategies for publishes.
 108   if (request.has_manage_messages_request()) {
 109     const RepeatedPtrField<PublishedMessage>& messages =
 110         request.manage_messages_request().message_to_publish();
 111     for (int i = 0; i < messages.size(); ++i) {
 112       BroadcastScanConfiguration config =
 113           GetBroadcastScanConfig(messages.Get(i));
 114       broadcast_only = broadcast_only || config == BROADCAST_ONLY;
 115       scan_only = scan_only || config == SCAN_ONLY;
 116       if (config == BROADCAST_AND_SCAN || (broadcast_only && scan_only))
 117         return BROADCAST_AND_SCAN;
 118     }
 119   }
 120
 121   // Strategies for subscriptions.
 122   if (request.has_manage_subscriptions_request()) {
 123     const RepeatedPtrField<Subscription> subscriptions =
 124         request.manage_subscriptions_request().subscription();
 125     for (int i = 0; i < subscriptions.size(); ++i) {
 126       BroadcastScanConfiguration config =
 127           GetBroadcastScanConfig(subscriptions.Get(i));
 128       broadcast_only = broadcast_only || config == BROADCAST_ONLY;
 129       scan_only = scan_only || config == SCAN_ONLY;
 130       if (config == BROADCAST_AND_SCAN || (broadcast_only && scan_only))
 131         return BROADCAST_AND_SCAN;
 132     }
 133   }
 134
 135   if (broadcast_only)
 136     return BROADCAST_ONLY;
 137   if (scan_only)
 138     return SCAN_ONLY;
 139
 140   // If nothing else is specified, default to both broadcast and scan.
 141   return BROADCAST_AND_SCAN;
 142 }
 143
 144 // TODO(rkc): Fix this hack once the server supports setting strategies per
 145 // operation.
 146 bool ExtractIsAudibleStrategy(const ReportRequest& request) {
 147   if (request.has_manage_messages_request()) {
 148     const RepeatedPtrField<PublishedMessage> messages =
 149         request.manage_messages_request().message_to_publish();
 150     for (int i = 0; i < messages.size(); ++i) {
 151       const PublishedMessage& msg = messages.Get(i);
 152       if (msg.has_token_exchange_strategy() &&
 153           msg.token_exchange_strategy().has_use_audible() &&
 154           msg.token_exchange_strategy().use_audible()) {
 155         return true;
 156       }
 157     }
 158   }
 159   return false;
 160 }
 161
 162 scoped_ptr<DeviceState> GetDeviceCapabilities(const ReportRequest& request) {
 163   scoped_ptr<DeviceState> state(new DeviceState);
 164
 165 // TODO(ckehoe): Currently this code causes a linker error on Windows.
 166 #ifndef OS_WIN
 167   TokenTechnology* token_technology =
 168       state->mutable_capabilities()->add_token_technology();
 169   token_technology->set_medium(AUDIO_ULTRASOUND_PASSBAND);
 170   if (ExtractIsAudibleStrategy(request))
 171     token_technology->set_medium(AUDIO_AUDIBLE_DTMF);
 172
 173   BroadcastScanConfiguration config =
 174       ExtractTokenExchangeStrategy(request);
 175   if (config == BROADCAST_ONLY || config == BROADCAST_AND_SCAN)
 176     token_technology->add_instruction_type(TRANSMIT);
 177   if (config == SCAN_ONLY || config == BROADCAST_AND_SCAN)
 178     token_technology->add_instruction_type(RECEIVE);
 179 #endif
 180
 181   return state.Pass();
 182 }
 183
 184 // TODO(ckehoe): We're keeping this code in a separate function for now
 185 // because we get a version string from Chrome, but the proto expects
 186 // an int64 version. We should probably change the version proto
 187 // to handle a more detailed version.
 188 ClientVersion* CreateVersion(const std::string& client,
 189                              const std::string& version_name) {
 190   ClientVersion* version = new ClientVersion;
 191
 192   version->set_client(client);
 193   version->set_version_name(version_name);
 194
 195   return version;
 196 }
 197
 198 void AddTokenToRequest(ReportRequest* request, const AudioToken& token) {
 199   TokenObservation* token_observation =
 200       request->mutable_update_signals_request()->add_token_observation();
 201   token_observation->set_token_id(ToUrlSafe(token.token));
 202
 203   TokenSignals* signals = token_observation->add_signals();
 204   signals->set_medium(token.audible ? AUDIO_AUDIBLE_DTMF
 205                                     : AUDIO_ULTRASOUND_PASSBAND);
 206   signals->set_observed_time_millis(base::Time::Now().ToJsTime());
 207 }
 208
 209 }  // namespace
 210
 211 // Public methods
 212
 213 RpcHandler::RpcHandler(CopresenceClientDelegate* delegate)
 214     : delegate_(delegate),
 215       invalid_audio_token_cache_(
 216           base::TimeDelta::FromMilliseconds(kInvalidTokenExpiryTimeMs),
 217           kMaxInvalidTokens),
 218       server_post_callback_(base::Bind(&RpcHandler::SendHttpPost,
 219                                        base::Unretained(this))) {}
 220
 221 RpcHandler::~RpcHandler() {
 222   for (std::set<HttpPost*>::iterator post = pending_posts_.begin();
 223        post != pending_posts_.end(); ++post) {
 224     delete *post;
 225   }
 226
 227   if (delegate_ && delegate_->GetWhispernetClient()) {
 228     delegate_->GetWhispernetClient()->RegisterTokensCallback(
 229         WhispernetClient::TokensCallback());
 230   }
 231 }
 232
 233 void RpcHandler::Initialize(const SuccessCallback& init_done_callback) {
 234   scoped_ptr<RegisterDeviceRequest> request(new RegisterDeviceRequest);
 235   DCHECK(device_id_.empty());
 236
 237   request->mutable_push_service()->set_service(PUSH_SERVICE_NONE);
 238   Identity* identity =
 239       request->mutable_device_identifiers()->mutable_registrant();
 240   identity->set_type(CHROME);
 241   identity->set_chrome_id(base::GenerateGUID());
 242   SendServerRequest(
 243       kRegisterDeviceRpcName,
 244       std::string(),
 245       request.Pass(),
 246       base::Bind(&RpcHandler::RegisterResponseHandler,
 247                  // On destruction, this request will be cancelled.
 248                  base::Unretained(this),
 249                  init_done_callback));
 250 }
 251
 252 void RpcHandler::SendReportRequest(scoped_ptr<ReportRequest> request) {
 253   SendReportRequest(request.Pass(), std::string(), StatusCallback());
 254 }
 255
 256 void RpcHandler::SendReportRequest(scoped_ptr<ReportRequest> request,
 257                                    const std::string& app_id,
 258                                    const StatusCallback& status_callback) {
 259   DCHECK(request.get());
 260   DCHECK(!device_id_.empty())
 261       << "RpcHandler::Initialize() must complete successfully "
 262       << "before other RpcHandler methods are called.";
 263
 264   DVLOG(3) << "Sending report request to server.";
 265
 266   // If we are unpublishing or unsubscribing, we need to stop those publish or
 267   // subscribes right away, we don't need to wait for the server to tell us.
 268   ProcessRemovedOperations(*request);
 269
 270   request->mutable_update_signals_request()->set_allocated_state(
 271       GetDeviceCapabilities(*request).release());
 272
 273   AddPlayingTokens(request.get());
 274
 275   // TODO(ckehoe): Currently the server supports only BROADCAST_AND_SCAN.
 276   // Remove this once b/16715253 is fixed.
 277   if (request->has_manage_messages_request()) {
 278     RepeatedPtrField<PublishedMessage>* messages = request
 279         ->mutable_manage_messages_request()->mutable_message_to_publish();
 280     for (int i = 0; i < messages->size(); ++i) {
 281       messages->Mutable(i)->mutable_token_exchange_strategy()
 282           ->set_broadcast_scan_configuration(BROADCAST_AND_SCAN);
 283     }
 284   }
 285   if (request->has_manage_subscriptions_request()) {
 286     RepeatedPtrField<Subscription>* subscriptions =
 287         request->mutable_manage_subscriptions_request()->mutable_subscription();
 288     for (int i = 0; i < subscriptions->size(); ++i) {
 289       subscriptions->Mutable(i)->mutable_token_exchange_strategy()
 290           ->set_broadcast_scan_configuration(BROADCAST_AND_SCAN);
 291     }
 292   }
 293
 294   SendServerRequest(kReportRequestRpcName,
 295                     app_id,
 296                     request.Pass(),
 297                     // On destruction, this request will be cancelled.
 298                     base::Bind(&RpcHandler::ReportResponseHandler,
 299                                base::Unretained(this),
 300                                status_callback));
 301 }
 302
 303 void RpcHandler::ReportTokens(const std::vector<AudioToken>& tokens) {
 304   DCHECK(!tokens.empty());
 305
 306   scoped_ptr<ReportRequest> request(new ReportRequest);
 307   for (size_t i = 0; i < tokens.size(); ++i) {
 308     if (invalid_audio_token_cache_.HasKey(ToUrlSafe(tokens[i].token)))
 309       continue;
 310     DVLOG(3) << "Sending token " << tokens[i].token << " to server.";
 311     AddTokenToRequest(request.get(), tokens[i]);
 312   }
 313   SendReportRequest(request.Pass());
 314 }
 315
 316 void RpcHandler::ConnectToWhispernet() {
 317   WhispernetClient* whispernet_client = delegate_->GetWhispernetClient();
 318
 319   // |directive_handler_| will be destructed with us, so unretained is safe.
 320   directive_handler_.reset(new DirectiveHandler);
 321   directive_handler_->Initialize(
 322       base::Bind(&WhispernetClient::DecodeSamples,
 323                  base::Unretained(whispernet_client)),
 324       base::Bind(&RpcHandler::AudioDirectiveListToWhispernetConnector,
 325                  base::Unretained(this)));
 326
 327   whispernet_client->RegisterTokensCallback(
 328       base::Bind(&RpcHandler::ReportTokens,
 329                  // On destruction, this callback will be disconnected.
 330                  base::Unretained(this)));
 331 }
 332
 333 // Private methods
 334
 335 void RpcHandler::RegisterResponseHandler(
 336     const SuccessCallback& init_done_callback,
 337     HttpPost* completed_post,
 338     int http_status_code,
 339     const std::string& response_data) {
 340   if (completed_post) {
 341     int elements_erased = pending_posts_.erase(completed_post);
 342     DCHECK(elements_erased);
 343     delete completed_post;
 344   }
 345
 346   if (http_status_code != net::HTTP_OK) {
 347     init_done_callback.Run(false);
 348     return;
 349   }
 350
 351   RegisterDeviceResponse response;
 352   if (!response.ParseFromString(response_data)) {
 353     LOG(ERROR) << "Invalid RegisterDeviceResponse:\n" << response_data;
 354     init_done_callback.Run(false);
 355     return;
 356   }
 357
 358   if (CopresenceErrorLogged(response.header().status()))
 359     return;
 360   device_id_ = response.registered_device_id();
 361   DCHECK(!device_id_.empty());
 362   DVLOG(2) << "Device registration successful: id " << device_id_;
 363   init_done_callback.Run(true);
 364 }
 365
 366 void RpcHandler::ReportResponseHandler(const StatusCallback& status_callback,
 367                                        HttpPost* completed_post,
 368                                        int http_status_code,
 369                                        const std::string& response_data) {
 370   if (completed_post) {
 371     int elements_erased = pending_posts_.erase(completed_post);
 372     DCHECK(elements_erased);
 373     delete completed_post;
 374   }
 375
 376   if (http_status_code != net::HTTP_OK) {
 377     if (!status_callback.is_null())
 378       status_callback.Run(FAIL);
 379     return;
 380   }
 381
 382   DVLOG(3) << "Received ReportResponse.";
 383   ReportResponse response;
 384   if (!response.ParseFromString(response_data)) {
 385     LOG(ERROR) << "Invalid ReportResponse";
 386     if (!status_callback.is_null())
 387       status_callback.Run(FAIL);
 388     return;
 389   }
 390
 391   if (ReportErrorLogged(response)) {
 392     if (!status_callback.is_null())
 393       status_callback.Run(FAIL);
 394     return;
 395   }
 396
 397   const RepeatedPtrField<MessageResult>& message_results =
 398       response.manage_messages_response().published_message_result();
 399   for (int i = 0; i < message_results.size(); ++i) {
 400     DVLOG(2) << "Published message with id "
 401              << message_results.Get(i).published_message_id();
 402   }
 403
 404   const RepeatedPtrField<SubscriptionResult>& subscription_results =
 405       response.manage_subscriptions_response().subscription_result();
 406   for (int i = 0; i < subscription_results.size(); ++i) {
 407     DVLOG(2) << "Created subscription with id "
 408              << subscription_results.Get(i).subscription_id();
 409   }
 410
 411   if (response.has_update_signals_response()) {
 412     const UpdateSignalsResponse& update_response =
 413         response.update_signals_response();
 414     DispatchMessages(update_response.message());
 415
 416     if (directive_handler_.get()) {
 417       for (int i = 0; i < update_response.directive_size(); ++i)
 418         directive_handler_->AddDirective(update_response.directive(i));
 419     } else {
 420       DVLOG(1) << "No directive handler.";
 421     }
 422
 423     const RepeatedPtrField<Token>& tokens = update_response.token();
 424     for (int i = 0; i < tokens.size(); ++i) {
 425       switch (tokens.Get(i).status()) {
 426         case VALID:
 427           // TODO(rkc/ckehoe): Store the token in a |valid_token_cache_| with a
 428           // short TTL (like 10s) and send it up with every report request.
 429           // Then we'll still get messages while we're waiting to hear it again.
 430           VLOG(1) << "Got valid token " << tokens.Get(i).id();
 431           break;
 432         case INVALID:
 433           DVLOG(3) << "Discarding invalid token " << tokens.Get(i).id();
 434           invalid_audio_token_cache_.Add(tokens.Get(i).id(), true);
 435           break;
 436         default:
 437           DVLOG(2) << "Token " << tokens.Get(i).id() << " has status code "
 438                    << tokens.Get(i).status();
 439       }
 440     }
 441   }
 442
 443   // TODO(ckehoe): Return a more detailed status response.
 444   if (!status_callback.is_null())
 445     status_callback.Run(SUCCESS);
 446 }
 447
 448 void RpcHandler::ProcessRemovedOperations(const ReportRequest& request) {
 449   // Remove unpublishes.
 450   if (request.has_manage_messages_request()) {
 451     const RepeatedPtrField<std::string>& unpublishes =
 452         request.manage_messages_request().id_to_unpublish();
 453     for (int i = 0; i < unpublishes.size(); ++i)
 454       directive_handler_->RemoveDirectives(unpublishes.Get(i));
 455   }
 456
 457   // Remove unsubscribes.
 458   if (request.has_manage_subscriptions_request()) {
 459     const RepeatedPtrField<std::string>& unsubscribes =
 460         request.manage_subscriptions_request().id_to_unsubscribe();
 461     for (int i = 0; i < unsubscribes.size(); ++i)
 462       directive_handler_->RemoveDirectives(unsubscribes.Get(i));
 463   }
 464 }
 465
 466 void RpcHandler::AddPlayingTokens(ReportRequest* request) {
 467   if (!directive_handler_)
 468     return;
 469
 470   const std::string& audible_token = directive_handler_->CurrentAudibleToken();
 471   const std::string& inaudible_token =
 472       directive_handler_->CurrentInaudibleToken();
 473
 474   if (!audible_token.empty())
 475     AddTokenToRequest(request, AudioToken(audible_token, true));
 476   if (!inaudible_token.empty())
 477     AddTokenToRequest(request, AudioToken(inaudible_token, false));
 478 }
 479
 480 void RpcHandler::DispatchMessages(
 481     const RepeatedPtrField<SubscribedMessage>& messages) {
 482   if (messages.size() == 0)
 483     return;
 484
 485   // Index the messages by subscription id.
 486   std::map<std::string, std::vector<Message> > messages_by_subscription;
 487   DVLOG(3) << "Dispatching " << messages.size() << " messages";
 488   for (int m = 0; m < messages.size(); ++m) {
 489     const RepeatedPtrField<std::string>& subscription_ids =
 490         messages.Get(m).subscription_id();
 491     for (int s = 0; s < subscription_ids.size(); ++s) {
 492       messages_by_subscription[subscription_ids.Get(s)].push_back(
 493           messages.Get(m).published_message());
 494     }
 495   }
 496
 497   // Send the messages for each subscription.
 498   for (std::map<std::string, std::vector<Message> >::const_iterator
 499            subscription = messages_by_subscription.begin();
 500        subscription != messages_by_subscription.end();
 501        ++subscription) {
 502     // TODO(ckehoe): Once we have the app ID from the server, we need to pass
 503     // it in here and get rid of the app id registry from the main API class.
 504     delegate_->HandleMessages("", subscription->first, subscription->second);
 505   }
 506 }
 507
 508 RequestHeader* RpcHandler::CreateRequestHeader(
 509     const std::string& client_name) const {
 510   RequestHeader* header = new RequestHeader;
 511
 512   header->set_allocated_framework_version(CreateVersion(
 513       "Chrome", delegate_->GetPlatformVersionString()));
 514   if (!client_name.empty()) {
 515     header->set_allocated_client_version(
 516         CreateVersion(client_name, std::string()));
 517   }
 518   header->set_current_time_millis(base::Time::Now().ToJsTime());
 519   header->set_registered_device_id(device_id_);
 520
 521   DeviceFingerprint* fingerprint = new DeviceFingerprint;
 522   fingerprint->set_platform_version(delegate_->GetPlatformVersionString());
 523   fingerprint->set_type(CHROME_PLATFORM_TYPE);
 524   header->set_allocated_device_fingerprint(fingerprint);
 525
 526   return header;
 527 }
 528
 529 template <class T>
 530 void RpcHandler::SendServerRequest(
 531     const std::string& rpc_name,
 532     const std::string& app_id,
 533     scoped_ptr<T> request,
 534     const PostCleanupCallback& response_handler) {
 535   request->set_allocated_header(CreateRequestHeader(app_id));
 536   server_post_callback_.Run(delegate_->GetRequestContext(),
 537                             rpc_name,
 538                             make_scoped_ptr<MessageLite>(request.release()),
 539                             response_handler);
 540 }
 541
 542 void RpcHandler::SendHttpPost(net::URLRequestContextGetter* url_context_getter,
 543                               const std::string& rpc_name,
 544                               scoped_ptr<MessageLite> request_proto,
 545                               const PostCleanupCallback& callback) {
 546   // Create the base URL to call.
 547   CommandLine* command_line = CommandLine::ForCurrentProcess();
 548   const std::string copresence_server_host =
 549       command_line->HasSwitch(switches::kCopresenceServer) ?
 550       command_line->GetSwitchValueASCII(switches::kCopresenceServer) :
 551       kDefaultCopresenceServer;
 552
 553   // Create the request and keep a pointer until it completes.
 554   HttpPost* http_post = new HttpPost(
 555       url_context_getter,
 556       copresence_server_host,
 557       rpc_name,
 558       command_line->GetSwitchValueASCII(switches::kCopresenceTracingToken),
 559       delegate_->GetAPIKey(),
 560       *request_proto);
 561
 562   http_post->Start(base::Bind(callback, http_post));
 563   pending_posts_.insert(http_post);
 564 }
 565
 566 void RpcHandler::AudioDirectiveListToWhispernetConnector(
 567     const std::string& token,
 568     bool audible,
 569     const WhispernetClient::SamplesCallback& samples_callback) {
 570   WhispernetClient* whispernet_client = delegate_->GetWhispernetClient();
 571   if (whispernet_client) {
 572     whispernet_client->RegisterSamplesCallback(samples_callback);
 573     whispernet_client->EncodeToken(token, audible);
 574   }
 575 }
 576
 577 }  // namespace copresence