content/child/resource_dispatcher.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 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
   6
   7 #include "content/child/resource_dispatcher.h"
   8
   9 #include "base/basictypes.h"
  10 #include "base/bind.h"
  11 #include "base/compiler_specific.h"
  12 #include "base/debug/alias.h"
  13 #include "base/files/file_path.h"
  14 #include "base/memory/shared_memory.h"
  15 #include "base/message_loop/message_loop.h"
  16 #include "base/metrics/histogram.h"
  17 #include "base/strings/string_util.h"
  18 #include "content/child/request_extra_data.h"
  19 #include "content/child/request_info.h"
  20 #include "content/child/resource_loader_bridge.h"
  21 #include "content/child/site_isolation_policy.h"
  22 #include "content/child/sync_load_response.h"
  23 #include "content/child/threaded_data_provider.h"
  24 #include "content/common/inter_process_time_ticks_converter.h"
  25 #include "content/common/resource_messages.h"
  26 #include "content/public/child/request_peer.h"
  27 #include "content/public/child/resource_dispatcher_delegate.h"
  28 #include "content/public/common/resource_response.h"
  29 #include "content/public/common/resource_type.h"
  30 #include "net/base/net_errors.h"
  31 #include "net/base/net_util.h"
  32 #include "net/base/request_priority.h"
  33 #include "net/http/http_response_headers.h"
  34
  35 namespace content {
  36
  37 namespace {
  38
  39 // Converts |time| from a remote to local TimeTicks, overwriting the original
  40 // value.
  41 void RemoteToLocalTimeTicks(
  42     const InterProcessTimeTicksConverter& converter,
  43     base::TimeTicks* time) {
  44   RemoteTimeTicks remote_time = RemoteTimeTicks::FromTimeTicks(*time);
  45   *time = converter.ToLocalTimeTicks(remote_time).ToTimeTicks();
  46 }
  47
  48 void CrashOnMapFailure() {
  49 #if defined(OS_WIN)
  50   DWORD last_err = GetLastError();
  51   base::debug::Alias(&last_err);
  52 #endif
  53   CHECK(false);
  54 }
  55
  56 // Each resource request is assigned an ID scoped to this process.
  57 int MakeRequestID() {
  58   // NOTE: The resource_dispatcher_host also needs probably unique
  59   // request_ids, so they count down from -2 (-1 is a special we're
  60   // screwed value), while the renderer process counts up.
  61   static int next_request_id = 0;
  62   return next_request_id++;
  63 }
  64
  65 }  // namespace
  66
  67 // ResourceLoaderBridge implementation ----------------------------------------
  68
  69 class IPCResourceLoaderBridge : public ResourceLoaderBridge {
  70  public:
  71   IPCResourceLoaderBridge(ResourceDispatcher* dispatcher,
  72                           const RequestInfo& request_info);
  73   virtual ~IPCResourceLoaderBridge();
  74
  75   // ResourceLoaderBridge
  76   virtual void SetRequestBody(ResourceRequestBody* request_body) OVERRIDE;
  77   virtual bool Start(RequestPeer* peer) OVERRIDE;
  78   virtual void Cancel() OVERRIDE;
  79   virtual void SetDefersLoading(bool value) OVERRIDE;
  80   virtual void DidChangePriority(net::RequestPriority new_priority,
  81                                  int intra_priority_value) OVERRIDE;
  82   virtual bool AttachThreadedDataReceiver(
  83       blink::WebThreadedDataReceiver* threaded_data_receiver) OVERRIDE;
  84   virtual void SyncLoad(SyncLoadResponse* response) OVERRIDE;
  85
  86  private:
  87   // The resource dispatcher for this loader.  The bridge doesn't own it, but
  88   // it's guaranteed to outlive the bridge.
  89   ResourceDispatcher* dispatcher_;
  90
  91   // The request to send, created on initialization for modification and
  92   // appending data.
  93   ResourceHostMsg_Request request_;
  94
  95   // ID for the request, valid once Start()ed, -1 if not valid yet.
  96   int request_id_;
  97
  98   // The routing id used when sending IPC messages.
  99   int routing_id_;
 100
 101   // The security origin of the frame that initiates this request.
 102   GURL frame_origin_;
 103
 104   bool is_synchronous_request_;
 105 };
 106
 107 IPCResourceLoaderBridge::IPCResourceLoaderBridge(
 108     ResourceDispatcher* dispatcher,
 109     const RequestInfo& request_info)
 110     : dispatcher_(dispatcher),
 111       request_id_(-1),
 112       routing_id_(request_info.routing_id),
 113       is_synchronous_request_(false) {
 114   DCHECK(dispatcher_) << "no resource dispatcher";
 115   request_.method = request_info.method;
 116   request_.url = request_info.url;
 117   request_.first_party_for_cookies = request_info.first_party_for_cookies;
 118   request_.referrer = request_info.referrer;
 119   request_.referrer_policy = request_info.referrer_policy;
 120   request_.headers = request_info.headers;
 121   request_.load_flags = request_info.load_flags;
 122   request_.origin_pid = request_info.requestor_pid;
 123   request_.resource_type = request_info.request_type;
 124   request_.priority = request_info.priority;
 125   request_.request_context = request_info.request_context;
 126   request_.appcache_host_id = request_info.appcache_host_id;
 127   request_.download_to_file = request_info.download_to_file;
 128   request_.has_user_gesture = request_info.has_user_gesture;
 129   request_.skip_service_worker = request_info.skip_service_worker;
 130   request_.enable_load_timing = request_info.enable_load_timing;
 131
 132   const RequestExtraData kEmptyData;
 133   const RequestExtraData* extra_data;
 134   if (request_info.extra_data)
 135     extra_data = static_cast<RequestExtraData*>(request_info.extra_data);
 136   else
 137     extra_data = &kEmptyData;
 138   request_.visiblity_state = extra_data->visibility_state();
 139   request_.render_frame_id = extra_data->render_frame_id();
 140   request_.is_main_frame = extra_data->is_main_frame();
 141   request_.parent_is_main_frame = extra_data->parent_is_main_frame();
 142   request_.parent_render_frame_id = extra_data->parent_render_frame_id();
 143   request_.allow_download = extra_data->allow_download();
 144   request_.transition_type = extra_data->transition_type();
 145   request_.should_replace_current_entry =
 146       extra_data->should_replace_current_entry();
 147   request_.transferred_request_child_id =
 148       extra_data->transferred_request_child_id();
 149   request_.transferred_request_request_id =
 150       extra_data->transferred_request_request_id();
 151   request_.service_worker_provider_id =
 152       extra_data->service_worker_provider_id();
 153   frame_origin_ = extra_data->frame_origin();
 154 }
 155
 156 IPCResourceLoaderBridge::~IPCResourceLoaderBridge() {
 157   // we remove our hook for the resource dispatcher only when going away, since
 158   // it doesn't keep track of whether we've force terminated the request
 159   if (request_id_ >= 0) {
 160     // this operation may fail, as the dispatcher will have preemptively
 161     // removed us when the renderer sends the ReceivedAllData message.
 162     dispatcher_->RemovePendingRequest(request_id_);
 163   }
 164 }
 165
 166 void IPCResourceLoaderBridge::SetRequestBody(
 167     ResourceRequestBody* request_body) {
 168   DCHECK(request_id_ == -1) << "request already started";
 169   request_.request_body = request_body;
 170 }
 171
 172 // Writes a footer on the message and sends it
 173 bool IPCResourceLoaderBridge::Start(RequestPeer* peer) {
 174   if (request_id_ != -1) {
 175     NOTREACHED() << "Starting a request twice";
 176     return false;
 177   }
 178
 179   // generate the request ID, and append it to the message
 180   request_id_ = dispatcher_->AddPendingRequest(peer,
 181                                                request_.resource_type,
 182                                                request_.origin_pid,
 183                                                frame_origin_,
 184                                                request_.url,
 185                                                request_.download_to_file);
 186
 187   return dispatcher_->message_sender()->Send(
 188       new ResourceHostMsg_RequestResource(routing_id_, request_id_, request_));
 189 }
 190
 191 void IPCResourceLoaderBridge::Cancel() {
 192   if (request_id_ < 0) {
 193     NOTREACHED() << "Trying to cancel an unstarted request";
 194     return;
 195   }
 196
 197   if (!is_synchronous_request_) {
 198     // This also removes the the request from the dispatcher.
 199     dispatcher_->CancelPendingRequest(request_id_);
 200   }
 201 }
 202
 203 void IPCResourceLoaderBridge::SetDefersLoading(bool value) {
 204   if (request_id_ < 0) {
 205     NOTREACHED() << "Trying to (un)defer an unstarted request";
 206     return;
 207   }
 208
 209   dispatcher_->SetDefersLoading(request_id_, value);
 210 }
 211
 212 void IPCResourceLoaderBridge::DidChangePriority(
 213     net::RequestPriority new_priority,
 214     int intra_priority_value) {
 215   if (request_id_ < 0) {
 216     NOTREACHED() << "Trying to change priority of an unstarted request";
 217     return;
 218   }
 219
 220   dispatcher_->DidChangePriority(
 221       request_id_, new_priority, intra_priority_value);
 222 }
 223
 224 bool IPCResourceLoaderBridge::AttachThreadedDataReceiver(
 225     blink::WebThreadedDataReceiver* threaded_data_receiver) {
 226   if (request_id_ < 0) {
 227     NOTREACHED() << "Trying to attach threaded receiver on unstarted request";
 228     return false;
 229   }
 230
 231   return dispatcher_->AttachThreadedDataReceiver(request_id_,
 232                                                  threaded_data_receiver);
 233 }
 234
 235 void IPCResourceLoaderBridge::SyncLoad(SyncLoadResponse* response) {
 236   if (request_id_ != -1) {
 237     NOTREACHED() << "Starting a request twice";
 238     response->error_code = net::ERR_FAILED;
 239     return;
 240   }
 241
 242   request_id_ = MakeRequestID();
 243   is_synchronous_request_ = true;
 244
 245   SyncLoadResult result;
 246   IPC::SyncMessage* msg = new ResourceHostMsg_SyncLoad(routing_id_, request_id_,
 247                                                        request_, &result);
 248   // NOTE: This may pump events (see RenderThread::Send).
 249   if (!dispatcher_->message_sender()->Send(msg)) {
 250     response->error_code = net::ERR_FAILED;
 251     return;
 252   }
 253
 254   response->error_code = result.error_code;
 255   response->url = result.final_url;
 256   response->headers = result.headers;
 257   response->mime_type = result.mime_type;
 258   response->charset = result.charset;
 259   response->request_time = result.request_time;
 260   response->response_time = result.response_time;
 261   response->encoded_data_length = result.encoded_data_length;
 262   response->load_timing = result.load_timing;
 263   response->devtools_info = result.devtools_info;
 264   response->data.swap(result.data);
 265   response->download_file_path = result.download_file_path;
 266 }
 267
 268 // ResourceDispatcher ---------------------------------------------------------
 269
 270 ResourceDispatcher::ResourceDispatcher(IPC::Sender* sender)
 271     : message_sender_(sender),
 272       delegate_(NULL),
 273       io_timestamp_(base::TimeTicks()),
 274       weak_factory_(this) {
 275 }
 276
 277 ResourceDispatcher::~ResourceDispatcher() {
 278 }
 279
 280 // ResourceDispatcher implementation ------------------------------------------
 281
 282 bool ResourceDispatcher::OnMessageReceived(const IPC::Message& message) {
 283   if (!IsResourceDispatcherMessage(message)) {
 284     return false;
 285   }
 286
 287   int request_id;
 288
 289   PickleIterator iter(message);
 290   if (!message.ReadInt(&iter, &request_id)) {
 291     NOTREACHED() << "malformed resource message";
 292     return true;
 293   }
 294
 295   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 296   if (!request_info) {
 297     // Release resources in the message if it is a data message.
 298     ReleaseResourcesInDataMessage(message);
 299     return true;
 300   }
 301
 302   if (request_info->is_deferred) {
 303     request_info->deferred_message_queue.push_back(new IPC::Message(message));
 304     return true;
 305   }
 306   // Make sure any deferred messages are dispatched before we dispatch more.
 307   if (!request_info->deferred_message_queue.empty()) {
 308     FlushDeferredMessages(request_id);
 309     // The request could have been deferred now. If yes then the current
 310     // message has to be queued up. The request_info instance should remain
 311     // valid here as there are pending messages for it.
 312     DCHECK(pending_requests_.find(request_id) != pending_requests_.end());
 313     if (request_info->is_deferred) {
 314       request_info->deferred_message_queue.push_back(new IPC::Message(message));
 315       return true;
 316     }
 317   }
 318
 319   DispatchMessage(message);
 320   return true;
 321 }
 322
 323 ResourceDispatcher::PendingRequestInfo*
 324 ResourceDispatcher::GetPendingRequestInfo(int request_id) {
 325   PendingRequestList::iterator it = pending_requests_.find(request_id);
 326   if (it == pending_requests_.end()) {
 327     // This might happen for kill()ed requests on the webkit end.
 328     return NULL;
 329   }
 330   return &(it->second);
 331 }
 332
 333 void ResourceDispatcher::OnUploadProgress(int request_id, int64 position,
 334                                           int64 size) {
 335   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 336   if (!request_info)
 337     return;
 338
 339   request_info->peer->OnUploadProgress(position, size);
 340
 341   // Acknowledge receipt
 342   message_sender_->Send(new ResourceHostMsg_UploadProgress_ACK(request_id));
 343 }
 344
 345 void ResourceDispatcher::OnReceivedResponse(
 346     int request_id, const ResourceResponseHead& response_head) {
 347   TRACE_EVENT0("loader", "ResourceDispatcher::OnReceivedResponse");
 348   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 349   if (!request_info)
 350     return;
 351   request_info->response_start = ConsumeIOTimestamp();
 352
 353   if (delegate_) {
 354     RequestPeer* new_peer =
 355         delegate_->OnReceivedResponse(
 356             request_info->peer, response_head.mime_type, request_info->url);
 357     if (new_peer)
 358       request_info->peer = new_peer;
 359   }
 360
 361   // Updates the response_url if the response was fetched by a ServiceWorker,
 362   // and it was not generated inside the ServiceWorker.
 363   if (response_head.was_fetched_via_service_worker &&
 364       !response_head.original_url_via_service_worker.is_empty()) {
 365     request_info->response_url = response_head.original_url_via_service_worker;
 366   }
 367
 368   ResourceResponseInfo renderer_response_info;
 369   ToResourceResponseInfo(*request_info, response_head, &renderer_response_info);
 370   request_info->site_isolation_metadata =
 371       SiteIsolationPolicy::OnReceivedResponse(request_info->frame_origin,
 372                                               request_info->response_url,
 373                                               request_info->resource_type,
 374                                               request_info->origin_pid,
 375                                               renderer_response_info);
 376   request_info->peer->OnReceivedResponse(renderer_response_info);
 377 }
 378
 379 void ResourceDispatcher::OnReceivedCachedMetadata(
 380       int request_id, const std::vector<char>& data) {
 381   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 382   if (!request_info)
 383     return;
 384
 385   if (data.size())
 386     request_info->peer->OnReceivedCachedMetadata(&data.front(), data.size());
 387 }
 388
 389 void ResourceDispatcher::OnSetDataBuffer(int request_id,
 390                                          base::SharedMemoryHandle shm_handle,
 391                                          int shm_size,
 392                                          base::ProcessId renderer_pid) {
 393   TRACE_EVENT0("loader", "ResourceDispatcher::OnSetDataBuffer");
 394   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 395   if (!request_info)
 396     return;
 397
 398   bool shm_valid = base::SharedMemory::IsHandleValid(shm_handle);
 399   CHECK((shm_valid && shm_size > 0) || (!shm_valid && !shm_size));
 400
 401   request_info->buffer.reset(
 402       new base::SharedMemory(shm_handle, true));  // read only
 403
 404   bool ok = request_info->buffer->Map(shm_size);
 405   if (!ok) {
 406     // Added to help debug crbug/160401.
 407     base::ProcessId renderer_pid_copy = renderer_pid;
 408     base::debug::Alias(&renderer_pid_copy);
 409
 410     base::SharedMemoryHandle shm_handle_copy = shm_handle;
 411     base::debug::Alias(&shm_handle_copy);
 412
 413     CrashOnMapFailure();
 414     return;
 415   }
 416
 417   request_info->buffer_size = shm_size;
 418 }
 419
 420 void ResourceDispatcher::OnReceivedData(int request_id,
 421                                         int data_offset,
 422                                         int data_length,
 423                                         int encoded_data_length) {
 424   TRACE_EVENT0("loader", "ResourceDispatcher::OnReceivedData");
 425   DCHECK_GT(data_length, 0);
 426   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 427   bool send_ack = true;
 428   if (request_info && data_length > 0) {
 429     CHECK(base::SharedMemory::IsHandleValid(request_info->buffer->handle()));
 430     CHECK_GE(request_info->buffer_size, data_offset + data_length);
 431
 432     // Ensure that the SHM buffer remains valid for the duration of this scope.
 433     // It is possible for CancelPendingRequest() to be called before we exit
 434     // this scope.
 435     linked_ptr<base::SharedMemory> retain_buffer(request_info->buffer);
 436
 437     base::TimeTicks time_start = base::TimeTicks::Now();
 438
 439     const char* data_start = static_cast<char*>(request_info->buffer->memory());
 440     CHECK(data_start);
 441     CHECK(data_start + data_offset);
 442     const char* data_ptr = data_start + data_offset;
 443
 444     // Check whether this response data is compliant with our cross-site
 445     // document blocking policy. We only do this for the first packet.
 446     std::string alternative_data;
 447     if (request_info->site_isolation_metadata.get()) {
 448       request_info->blocked_response =
 449           SiteIsolationPolicy::ShouldBlockResponse(
 450               request_info->site_isolation_metadata, data_ptr, data_length,
 451               &alternative_data);
 452       request_info->site_isolation_metadata.reset();
 453
 454       // When the response is blocked we may have any alternative data to
 455       // send to the renderer. When |alternative_data| is zero-sized, we do not
 456       // call peer's callback.
 457       if (request_info->blocked_response && !alternative_data.empty()) {
 458         data_ptr = alternative_data.data();
 459         data_length = alternative_data.size();
 460         encoded_data_length = alternative_data.size();
 461       }
 462     }
 463
 464     if (!request_info->blocked_response || !alternative_data.empty()) {
 465       if (request_info->threaded_data_provider) {
 466         request_info->threaded_data_provider->OnReceivedDataOnForegroundThread(
 467             data_ptr, data_length, encoded_data_length);
 468         // A threaded data provider will take care of its own ACKing, as the
 469         // data may be processed later on another thread.
 470         send_ack = false;
 471       } else {
 472         request_info->peer->OnReceivedData(
 473             data_ptr, data_length, encoded_data_length);
 474       }
 475     }
 476
 477     UMA_HISTOGRAM_TIMES("ResourceDispatcher.OnReceivedDataTime",
 478                         base::TimeTicks::Now() - time_start);
 479   }
 480
 481   // Acknowledge the reception of this data.
 482   if (send_ack)
 483     message_sender_->Send(new ResourceHostMsg_DataReceived_ACK(request_id));
 484 }
 485
 486 void ResourceDispatcher::OnDownloadedData(int request_id,
 487                                           int data_len,
 488                                           int encoded_data_length) {
 489   // Acknowledge the reception of this message.
 490   message_sender_->Send(new ResourceHostMsg_DataDownloaded_ACK(request_id));
 491
 492   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 493   if (!request_info)
 494     return;
 495
 496   request_info->peer->OnDownloadedData(data_len, encoded_data_length);
 497 }
 498
 499 void ResourceDispatcher::OnReceivedRedirect(
 500     int request_id,
 501     const net::RedirectInfo& redirect_info,
 502     const ResourceResponseHead& response_head) {
 503   TRACE_EVENT0("loader", "ResourceDispatcher::OnReceivedRedirect");
 504   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 505   if (!request_info)
 506     return;
 507   request_info->response_start = ConsumeIOTimestamp();
 508
 509   ResourceResponseInfo renderer_response_info;
 510   ToResourceResponseInfo(*request_info, response_head, &renderer_response_info);
 511   if (request_info->peer->OnReceivedRedirect(redirect_info,
 512                                              renderer_response_info)) {
 513     // Double-check if the request is still around. The call above could
 514     // potentially remove it.
 515     request_info = GetPendingRequestInfo(request_id);
 516     if (!request_info)
 517       return;
 518     // We update the response_url here so that we can send it to
 519     // SiteIsolationPolicy later when OnReceivedResponse is called.
 520     request_info->response_url = redirect_info.new_url;
 521     request_info->pending_redirect_message.reset(
 522         new ResourceHostMsg_FollowRedirect(request_id));
 523     if (!request_info->is_deferred) {
 524       FollowPendingRedirect(request_id, *request_info);
 525     }
 526   } else {
 527     CancelPendingRequest(request_id);
 528   }
 529 }
 530
 531 void ResourceDispatcher::FollowPendingRedirect(
 532     int request_id,
 533     PendingRequestInfo& request_info) {
 534   IPC::Message* msg = request_info.pending_redirect_message.release();
 535   if (msg)
 536     message_sender_->Send(msg);
 537 }
 538
 539 void ResourceDispatcher::OnRequestComplete(
 540     int request_id,
 541     const ResourceMsg_RequestCompleteData& request_complete_data) {
 542   TRACE_EVENT0("loader", "ResourceDispatcher::OnRequestComplete");
 543
 544   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 545   if (!request_info)
 546     return;
 547   request_info->completion_time = ConsumeIOTimestamp();
 548   request_info->buffer.reset();
 549   request_info->buffer_size = 0;
 550
 551   RequestPeer* peer = request_info->peer;
 552
 553   if (delegate_) {
 554     RequestPeer* new_peer =
 555         delegate_->OnRequestComplete(
 556             request_info->peer, request_info->resource_type,
 557             request_complete_data.error_code);
 558     if (new_peer)
 559       request_info->peer = new_peer;
 560   }
 561
 562   base::TimeTicks renderer_completion_time = ToRendererCompletionTime(
 563       *request_info, request_complete_data.completion_time);
 564   // The request ID will be removed from our pending list in the destructor.
 565   // Normally, dispatching this message causes the reference-counted request to
 566   // die immediately.
 567   peer->OnCompletedRequest(request_complete_data.error_code,
 568                            request_complete_data.was_ignored_by_handler,
 569                            request_complete_data.exists_in_cache,
 570                            request_complete_data.security_info,
 571                            renderer_completion_time,
 572                            request_complete_data.encoded_data_length);
 573 }
 574
 575 int ResourceDispatcher::AddPendingRequest(RequestPeer* callback,
 576                                           ResourceType resource_type,
 577                                           int origin_pid,
 578                                           const GURL& frame_origin,
 579                                           const GURL& request_url,
 580                                           bool download_to_file) {
 581   // Compute a unique request_id for this renderer process.
 582   int id = MakeRequestID();
 583   pending_requests_[id] = PendingRequestInfo(callback,
 584                                              resource_type,
 585                                              origin_pid,
 586                                              frame_origin,
 587                                              request_url,
 588                                              download_to_file);
 589   return id;
 590 }
 591
 592 bool ResourceDispatcher::RemovePendingRequest(int request_id) {
 593   PendingRequestList::iterator it = pending_requests_.find(request_id);
 594   if (it == pending_requests_.end())
 595     return false;
 596
 597   PendingRequestInfo& request_info = it->second;
 598
 599   bool release_downloaded_file = request_info.download_to_file;
 600
 601   ReleaseResourcesInMessageQueue(&request_info.deferred_message_queue);
 602   pending_requests_.erase(it);
 603
 604   if (release_downloaded_file) {
 605     message_sender_->Send(
 606         new ResourceHostMsg_ReleaseDownloadedFile(request_id));
 607   }
 608
 609   return true;
 610 }
 611
 612 void ResourceDispatcher::CancelPendingRequest(int request_id) {
 613   PendingRequestList::iterator it = pending_requests_.find(request_id);
 614   if (it == pending_requests_.end()) {
 615     DVLOG(1) << "unknown request";
 616     return;
 617   }
 618
 619   // Cancel the request, and clean it up so the bridge will receive no more
 620   // messages.
 621   message_sender_->Send(new ResourceHostMsg_CancelRequest(request_id));
 622   RemovePendingRequest(request_id);
 623 }
 624
 625 void ResourceDispatcher::SetDefersLoading(int request_id, bool value) {
 626   PendingRequestList::iterator it = pending_requests_.find(request_id);
 627   if (it == pending_requests_.end()) {
 628     DLOG(ERROR) << "unknown request";
 629     return;
 630   }
 631   PendingRequestInfo& request_info = it->second;
 632   if (value) {
 633     request_info.is_deferred = value;
 634   } else if (request_info.is_deferred) {
 635     request_info.is_deferred = false;
 636
 637     FollowPendingRedirect(request_id, request_info);
 638
 639     base::MessageLoop::current()->PostTask(
 640         FROM_HERE,
 641         base::Bind(&ResourceDispatcher::FlushDeferredMessages,
 642                    weak_factory_.GetWeakPtr(),
 643                    request_id));
 644   }
 645 }
 646
 647 void ResourceDispatcher::DidChangePriority(int request_id,
 648                                            net::RequestPriority new_priority,
 649                                            int intra_priority_value) {
 650   DCHECK(ContainsKey(pending_requests_, request_id));
 651   message_sender_->Send(new ResourceHostMsg_DidChangePriority(
 652       request_id, new_priority, intra_priority_value));
 653 }
 654
 655 bool ResourceDispatcher::AttachThreadedDataReceiver(
 656     int request_id, blink::WebThreadedDataReceiver* threaded_data_receiver) {
 657   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 658   DCHECK(request_info);
 659
 660   if (request_info->buffer != NULL) {
 661     DCHECK(!request_info->threaded_data_provider);
 662     request_info->threaded_data_provider = new ThreadedDataProvider(
 663         request_id, threaded_data_receiver, request_info->buffer,
 664         request_info->buffer_size);
 665     return true;
 666   }
 667
 668   return false;
 669 }
 670
 671 ResourceDispatcher::PendingRequestInfo::PendingRequestInfo()
 672     : peer(NULL),
 673       threaded_data_provider(NULL),
 674       resource_type(RESOURCE_TYPE_SUB_RESOURCE),
 675       is_deferred(false),
 676       download_to_file(false),
 677       blocked_response(false),
 678       buffer_size(0) {
 679 }
 680
 681 ResourceDispatcher::PendingRequestInfo::PendingRequestInfo(
 682     RequestPeer* peer,
 683     ResourceType resource_type,
 684     int origin_pid,
 685     const GURL& frame_origin,
 686     const GURL& request_url,
 687     bool download_to_file)
 688     : peer(peer),
 689       threaded_data_provider(NULL),
 690       resource_type(resource_type),
 691       origin_pid(origin_pid),
 692       is_deferred(false),
 693       url(request_url),
 694       frame_origin(frame_origin),
 695       response_url(request_url),
 696       download_to_file(download_to_file),
 697       request_start(base::TimeTicks::Now()),
 698       blocked_response(false) {}
 699
 700 ResourceDispatcher::PendingRequestInfo::~PendingRequestInfo() {
 701   if (threaded_data_provider)
 702     threaded_data_provider->Stop();
 703 }
 704
 705 void ResourceDispatcher::DispatchMessage(const IPC::Message& message) {
 706   IPC_BEGIN_MESSAGE_MAP(ResourceDispatcher, message)
 707     IPC_MESSAGE_HANDLER(ResourceMsg_UploadProgress, OnUploadProgress)
 708     IPC_MESSAGE_HANDLER(ResourceMsg_ReceivedResponse, OnReceivedResponse)
 709     IPC_MESSAGE_HANDLER(ResourceMsg_ReceivedCachedMetadata,
 710                         OnReceivedCachedMetadata)
 711     IPC_MESSAGE_HANDLER(ResourceMsg_ReceivedRedirect, OnReceivedRedirect)
 712     IPC_MESSAGE_HANDLER(ResourceMsg_SetDataBuffer, OnSetDataBuffer)
 713     IPC_MESSAGE_HANDLER(ResourceMsg_DataReceived, OnReceivedData)
 714     IPC_MESSAGE_HANDLER(ResourceMsg_DataDownloaded, OnDownloadedData)
 715     IPC_MESSAGE_HANDLER(ResourceMsg_RequestComplete, OnRequestComplete)
 716   IPC_END_MESSAGE_MAP()
 717 }
 718
 719 void ResourceDispatcher::FlushDeferredMessages(int request_id) {
 720   PendingRequestList::iterator it = pending_requests_.find(request_id);
 721   if (it == pending_requests_.end())  // The request could have become invalid.
 722     return;
 723   PendingRequestInfo& request_info = it->second;
 724   if (request_info.is_deferred)
 725     return;
 726   // Because message handlers could result in request_info being destroyed,
 727   // we need to work with a stack reference to the deferred queue.
 728   MessageQueue q;
 729   q.swap(request_info.deferred_message_queue);
 730   while (!q.empty()) {
 731     IPC::Message* m = q.front();
 732     q.pop_front();
 733     DispatchMessage(*m);
 734     delete m;
 735     // If this request is deferred in the context of the above message, then
 736     // we should honor the same and stop dispatching further messages.
 737     // We need to find the request again in the list as it may have completed
 738     // by now and the request_info instance above may be invalid.
 739     PendingRequestList::iterator index = pending_requests_.find(request_id);
 740     if (index != pending_requests_.end()) {
 741       PendingRequestInfo& pending_request = index->second;
 742       if (pending_request.is_deferred) {
 743         pending_request.deferred_message_queue.swap(q);
 744         return;
 745       }
 746     }
 747   }
 748 }
 749
 750 ResourceLoaderBridge* ResourceDispatcher::CreateBridge(
 751     const RequestInfo& request_info) {
 752   return new IPCResourceLoaderBridge(this, request_info);
 753 }
 754
 755 void ResourceDispatcher::ToResourceResponseInfo(
 756     const PendingRequestInfo& request_info,
 757     const ResourceResponseHead& browser_info,
 758     ResourceResponseInfo* renderer_info) const {
 759   *renderer_info = browser_info;
 760   if (request_info.request_start.is_null() ||
 761       request_info.response_start.is_null() ||
 762       browser_info.request_start.is_null() ||
 763       browser_info.response_start.is_null() ||
 764       browser_info.load_timing.request_start.is_null()) {
 765     return;
 766   }
 767   InterProcessTimeTicksConverter converter(
 768       LocalTimeTicks::FromTimeTicks(request_info.request_start),
 769       LocalTimeTicks::FromTimeTicks(request_info.response_start),
 770       RemoteTimeTicks::FromTimeTicks(browser_info.request_start),
 771       RemoteTimeTicks::FromTimeTicks(browser_info.response_start));
 772
 773   net::LoadTimingInfo* load_timing = &renderer_info->load_timing;
 774   RemoteToLocalTimeTicks(converter, &load_timing->request_start);
 775   RemoteToLocalTimeTicks(converter, &load_timing->proxy_resolve_start);
 776   RemoteToLocalTimeTicks(converter, &load_timing->proxy_resolve_end);
 777   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.dns_start);
 778   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.dns_end);
 779   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.connect_start);
 780   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.connect_end);
 781   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.ssl_start);
 782   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.ssl_end);
 783   RemoteToLocalTimeTicks(converter, &load_timing->send_start);
 784   RemoteToLocalTimeTicks(converter, &load_timing->send_end);
 785   RemoteToLocalTimeTicks(converter, &load_timing->receive_headers_end);
 786   RemoteToLocalTimeTicks(converter,
 787                          &renderer_info->service_worker_fetch_start);
 788   RemoteToLocalTimeTicks(converter,
 789                          &renderer_info->service_worker_fetch_ready);
 790   RemoteToLocalTimeTicks(converter,
 791                          &renderer_info->service_worker_fetch_end);
 792
 793   // Collect UMA on the inter-process skew.
 794   bool is_skew_additive = false;
 795   if (converter.IsSkewAdditiveForMetrics()) {
 796     is_skew_additive = true;
 797     base::TimeDelta skew = converter.GetSkewForMetrics();
 798     if (skew >= base::TimeDelta()) {
 799       UMA_HISTOGRAM_TIMES(
 800           "InterProcessTimeTicks.BrowserAhead_BrowserToRenderer", skew);
 801     } else {
 802       UMA_HISTOGRAM_TIMES(
 803           "InterProcessTimeTicks.BrowserBehind_BrowserToRenderer", -skew);
 804     }
 805   }
 806   UMA_HISTOGRAM_BOOLEAN(
 807       "InterProcessTimeTicks.IsSkewAdditive_BrowserToRenderer",
 808       is_skew_additive);
 809 }
 810
 811 base::TimeTicks ResourceDispatcher::ToRendererCompletionTime(
 812     const PendingRequestInfo& request_info,
 813     const base::TimeTicks& browser_completion_time) const {
 814   if (request_info.completion_time.is_null()) {
 815     return browser_completion_time;
 816   }
 817
 818   // TODO(simonjam): The optimal lower bound should be the most recent value of
 819   // TimeTicks::Now() returned to WebKit. Is it worth trying to cache that?
 820   // Until then, |response_start| is used as it is the most recent value
 821   // returned for this request.
 822   int64 result = std::max(browser_completion_time.ToInternalValue(),
 823                           request_info.response_start.ToInternalValue());
 824   result = std::min(result, request_info.completion_time.ToInternalValue());
 825   return base::TimeTicks::FromInternalValue(result);
 826 }
 827
 828 base::TimeTicks ResourceDispatcher::ConsumeIOTimestamp() {
 829   if (io_timestamp_ == base::TimeTicks())
 830     return base::TimeTicks::Now();
 831   base::TimeTicks result = io_timestamp_;
 832   io_timestamp_ = base::TimeTicks();
 833   return result;
 834 }
 835
 836 // static
 837 bool ResourceDispatcher::IsResourceDispatcherMessage(
 838     const IPC::Message& message) {
 839   switch (message.type()) {
 840     case ResourceMsg_UploadProgress::ID:
 841     case ResourceMsg_ReceivedResponse::ID:
 842     case ResourceMsg_ReceivedCachedMetadata::ID:
 843     case ResourceMsg_ReceivedRedirect::ID:
 844     case ResourceMsg_SetDataBuffer::ID:
 845     case ResourceMsg_DataReceived::ID:
 846     case ResourceMsg_DataDownloaded::ID:
 847     case ResourceMsg_RequestComplete::ID:
 848       return true;
 849
 850     default:
 851       break;
 852   }
 853
 854   return false;
 855 }
 856
 857 // static
 858 void ResourceDispatcher::ReleaseResourcesInDataMessage(
 859     const IPC::Message& message) {
 860   PickleIterator iter(message);
 861   int request_id;
 862   if (!message.ReadInt(&iter, &request_id)) {
 863     NOTREACHED() << "malformed resource message";
 864     return;
 865   }
 866
 867   // If the message contains a shared memory handle, we should close the handle
 868   // or there will be a memory leak.
 869   if (message.type() == ResourceMsg_SetDataBuffer::ID) {
 870     base::SharedMemoryHandle shm_handle;
 871     if (IPC::ParamTraits<base::SharedMemoryHandle>::Read(&message,
 872                                                          &iter,
 873                                                          &shm_handle)) {
 874       if (base::SharedMemory::IsHandleValid(shm_handle))
 875         base::SharedMemory::CloseHandle(shm_handle);
 876     }
 877   }
 878 }
 879
 880 // static
 881 void ResourceDispatcher::ReleaseResourcesInMessageQueue(MessageQueue* queue) {
 882   while (!queue->empty()) {
 883     IPC::Message* message = queue->front();
 884     ReleaseResourcesInDataMessage(*message);
 885     queue->pop_front();
 886     delete message;
 887   }
 888 }
 889
 890 }  // namespace content