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   ~IPCResourceLoaderBridge() override;
  74
  75   // ResourceLoaderBridge
  76   void SetRequestBody(ResourceRequestBody* request_body) override;
  77   bool Start(RequestPeer* peer) override;
  78   void Cancel() override;
  79   void SetDefersLoading(bool value) override;
  80   void DidChangePriority(net::RequestPriority new_priority,
  81                          int intra_priority_value) override;
  82   bool AttachThreadedDataReceiver(
  83       blink::WebThreadedDataReceiver* threaded_data_receiver) override;
  84   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_.fetch_request_mode = request_info.fetch_request_mode;
 131   request_.fetch_credentials_mode = request_info.fetch_credentials_mode;
 132   request_.fetch_request_context_type = request_info.fetch_request_context_type;
 133   request_.fetch_frame_type = request_info.fetch_frame_type;
 134   request_.enable_load_timing = request_info.enable_load_timing;
 135
 136   const RequestExtraData kEmptyData;
 137   const RequestExtraData* extra_data;
 138   if (request_info.extra_data)
 139     extra_data = static_cast<RequestExtraData*>(request_info.extra_data);
 140   else
 141     extra_data = &kEmptyData;
 142   request_.visiblity_state = extra_data->visibility_state();
 143   request_.render_frame_id = extra_data->render_frame_id();
 144   request_.is_main_frame = extra_data->is_main_frame();
 145   request_.parent_is_main_frame = extra_data->parent_is_main_frame();
 146   request_.parent_render_frame_id = extra_data->parent_render_frame_id();
 147   request_.allow_download = extra_data->allow_download();
 148   request_.transition_type = extra_data->transition_type();
 149   request_.should_replace_current_entry =
 150       extra_data->should_replace_current_entry();
 151   request_.transferred_request_child_id =
 152       extra_data->transferred_request_child_id();
 153   request_.transferred_request_request_id =
 154       extra_data->transferred_request_request_id();
 155   request_.service_worker_provider_id =
 156       extra_data->service_worker_provider_id();
 157   frame_origin_ = extra_data->frame_origin();
 158 }
 159
 160 IPCResourceLoaderBridge::~IPCResourceLoaderBridge() {
 161   // we remove our hook for the resource dispatcher only when going away, since
 162   // it doesn't keep track of whether we've force terminated the request
 163   if (request_id_ >= 0) {
 164     // this operation may fail, as the dispatcher will have preemptively
 165     // removed us when the renderer sends the ReceivedAllData message.
 166     dispatcher_->RemovePendingRequest(request_id_);
 167   }
 168 }
 169
 170 void IPCResourceLoaderBridge::SetRequestBody(
 171     ResourceRequestBody* request_body) {
 172   DCHECK(request_id_ == -1) << "request already started";
 173   request_.request_body = request_body;
 174 }
 175
 176 // Writes a footer on the message and sends it
 177 bool IPCResourceLoaderBridge::Start(RequestPeer* peer) {
 178   if (request_id_ != -1) {
 179     NOTREACHED() << "Starting a request twice";
 180     return false;
 181   }
 182
 183   // generate the request ID, and append it to the message
 184   request_id_ = dispatcher_->AddPendingRequest(peer,
 185                                                request_.resource_type,
 186                                                request_.origin_pid,
 187                                                frame_origin_,
 188                                                request_.url,
 189                                                request_.download_to_file);
 190
 191   return dispatcher_->message_sender()->Send(
 192       new ResourceHostMsg_RequestResource(routing_id_, request_id_, request_));
 193 }
 194
 195 void IPCResourceLoaderBridge::Cancel() {
 196   if (request_id_ < 0) {
 197     NOTREACHED() << "Trying to cancel an unstarted request";
 198     return;
 199   }
 200
 201   if (!is_synchronous_request_) {
 202     // This also removes the the request from the dispatcher.
 203     dispatcher_->CancelPendingRequest(request_id_);
 204   }
 205 }
 206
 207 void IPCResourceLoaderBridge::SetDefersLoading(bool value) {
 208   if (request_id_ < 0) {
 209     NOTREACHED() << "Trying to (un)defer an unstarted request";
 210     return;
 211   }
 212
 213   dispatcher_->SetDefersLoading(request_id_, value);
 214 }
 215
 216 void IPCResourceLoaderBridge::DidChangePriority(
 217     net::RequestPriority new_priority,
 218     int intra_priority_value) {
 219   if (request_id_ < 0) {
 220     NOTREACHED() << "Trying to change priority of an unstarted request";
 221     return;
 222   }
 223
 224   dispatcher_->DidChangePriority(
 225       request_id_, new_priority, intra_priority_value);
 226 }
 227
 228 bool IPCResourceLoaderBridge::AttachThreadedDataReceiver(
 229     blink::WebThreadedDataReceiver* threaded_data_receiver) {
 230   if (request_id_ < 0) {
 231     NOTREACHED() << "Trying to attach threaded receiver on unstarted request";
 232     return false;
 233   }
 234
 235   return dispatcher_->AttachThreadedDataReceiver(request_id_,
 236                                                  threaded_data_receiver);
 237 }
 238
 239 void IPCResourceLoaderBridge::SyncLoad(SyncLoadResponse* response) {
 240   if (request_id_ != -1) {
 241     NOTREACHED() << "Starting a request twice";
 242     response->error_code = net::ERR_FAILED;
 243     return;
 244   }
 245
 246   request_id_ = MakeRequestID();
 247   is_synchronous_request_ = true;
 248
 249   SyncLoadResult result;
 250   IPC::SyncMessage* msg = new ResourceHostMsg_SyncLoad(routing_id_, request_id_,
 251                                                        request_, &result);
 252   // NOTE: This may pump events (see RenderThread::Send).
 253   if (!dispatcher_->message_sender()->Send(msg)) {
 254     response->error_code = net::ERR_FAILED;
 255     return;
 256   }
 257
 258   response->error_code = result.error_code;
 259   response->url = result.final_url;
 260   response->headers = result.headers;
 261   response->mime_type = result.mime_type;
 262   response->charset = result.charset;
 263   response->request_time = result.request_time;
 264   response->response_time = result.response_time;
 265   response->encoded_data_length = result.encoded_data_length;
 266   response->load_timing = result.load_timing;
 267   response->devtools_info = result.devtools_info;
 268   response->data.swap(result.data);
 269   response->download_file_path = result.download_file_path;
 270 }
 271
 272 // ResourceDispatcher ---------------------------------------------------------
 273
 274 ResourceDispatcher::ResourceDispatcher(IPC::Sender* sender)
 275     : message_sender_(sender),
 276       delegate_(NULL),
 277       io_timestamp_(base::TimeTicks()),
 278       weak_factory_(this) {
 279 }
 280
 281 ResourceDispatcher::~ResourceDispatcher() {
 282 }
 283
 284 // ResourceDispatcher implementation ------------------------------------------
 285
 286 bool ResourceDispatcher::OnMessageReceived(const IPC::Message& message) {
 287   if (!IsResourceDispatcherMessage(message)) {
 288     return false;
 289   }
 290
 291   int request_id;
 292
 293   PickleIterator iter(message);
 294   if (!message.ReadInt(&iter, &request_id)) {
 295     NOTREACHED() << "malformed resource message";
 296     return true;
 297   }
 298
 299   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 300   if (!request_info) {
 301     // Release resources in the message if it is a data message.
 302     ReleaseResourcesInDataMessage(message);
 303     return true;
 304   }
 305
 306   if (request_info->is_deferred) {
 307     request_info->deferred_message_queue.push_back(new IPC::Message(message));
 308     return true;
 309   }
 310   // Make sure any deferred messages are dispatched before we dispatch more.
 311   if (!request_info->deferred_message_queue.empty()) {
 312     FlushDeferredMessages(request_id);
 313     // The request could have been deferred now. If yes then the current
 314     // message has to be queued up. The request_info instance should remain
 315     // valid here as there are pending messages for it.
 316     DCHECK(pending_requests_.find(request_id) != pending_requests_.end());
 317     if (request_info->is_deferred) {
 318       request_info->deferred_message_queue.push_back(new IPC::Message(message));
 319       return true;
 320     }
 321   }
 322
 323   DispatchMessage(message);
 324   return true;
 325 }
 326
 327 ResourceDispatcher::PendingRequestInfo*
 328 ResourceDispatcher::GetPendingRequestInfo(int request_id) {
 329   PendingRequestList::iterator it = pending_requests_.find(request_id);
 330   if (it == pending_requests_.end()) {
 331     // This might happen for kill()ed requests on the webkit end.
 332     return NULL;
 333   }
 334   return &(it->second);
 335 }
 336
 337 void ResourceDispatcher::OnUploadProgress(int request_id, int64 position,
 338                                           int64 size) {
 339   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 340   if (!request_info)
 341     return;
 342
 343   request_info->peer->OnUploadProgress(position, size);
 344
 345   // Acknowledge receipt
 346   message_sender_->Send(new ResourceHostMsg_UploadProgress_ACK(request_id));
 347 }
 348
 349 void ResourceDispatcher::OnReceivedResponse(
 350     int request_id, const ResourceResponseHead& response_head) {
 351   TRACE_EVENT0("loader", "ResourceDispatcher::OnReceivedResponse");
 352   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 353   if (!request_info)
 354     return;
 355   request_info->response_start = ConsumeIOTimestamp();
 356
 357   if (delegate_) {
 358     RequestPeer* new_peer =
 359         delegate_->OnReceivedResponse(
 360             request_info->peer, response_head.mime_type, request_info->url);
 361     if (new_peer)
 362       request_info->peer = new_peer;
 363   }
 364
 365   // Updates the response_url if the response was fetched by a ServiceWorker,
 366   // and it was not generated inside the ServiceWorker.
 367   if (response_head.was_fetched_via_service_worker &&
 368       !response_head.original_url_via_service_worker.is_empty()) {
 369     request_info->response_url = response_head.original_url_via_service_worker;
 370   }
 371
 372   ResourceResponseInfo renderer_response_info;
 373   ToResourceResponseInfo(*request_info, response_head, &renderer_response_info);
 374   request_info->site_isolation_metadata =
 375       SiteIsolationPolicy::OnReceivedResponse(request_info->frame_origin,
 376                                               request_info->response_url,
 377                                               request_info->resource_type,
 378                                               request_info->origin_pid,
 379                                               renderer_response_info);
 380   request_info->peer->OnReceivedResponse(renderer_response_info);
 381 }
 382
 383 void ResourceDispatcher::OnReceivedCachedMetadata(
 384       int request_id, const std::vector<char>& data) {
 385   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 386   if (!request_info)
 387     return;
 388
 389   if (data.size())
 390     request_info->peer->OnReceivedCachedMetadata(&data.front(), data.size());
 391 }
 392
 393 void ResourceDispatcher::OnSetDataBuffer(int request_id,
 394                                          base::SharedMemoryHandle shm_handle,
 395                                          int shm_size,
 396                                          base::ProcessId renderer_pid) {
 397   TRACE_EVENT0("loader", "ResourceDispatcher::OnSetDataBuffer");
 398   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 399   if (!request_info)
 400     return;
 401
 402   bool shm_valid = base::SharedMemory::IsHandleValid(shm_handle);
 403   CHECK((shm_valid && shm_size > 0) || (!shm_valid && !shm_size));
 404
 405   request_info->buffer.reset(
 406       new base::SharedMemory(shm_handle, true));  // read only
 407
 408   bool ok = request_info->buffer->Map(shm_size);
 409   if (!ok) {
 410     // Added to help debug crbug/160401.
 411     base::ProcessId renderer_pid_copy = renderer_pid;
 412     base::debug::Alias(&renderer_pid_copy);
 413
 414     base::SharedMemoryHandle shm_handle_copy = shm_handle;
 415     base::debug::Alias(&shm_handle_copy);
 416
 417     CrashOnMapFailure();
 418     return;
 419   }
 420
 421   request_info->buffer_size = shm_size;
 422 }
 423
 424 void ResourceDispatcher::OnReceivedData(int request_id,
 425                                         int data_offset,
 426                                         int data_length,
 427                                         int encoded_data_length) {
 428   TRACE_EVENT0("loader", "ResourceDispatcher::OnReceivedData");
 429   DCHECK_GT(data_length, 0);
 430   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 431   bool send_ack = true;
 432   if (request_info && data_length > 0) {
 433     CHECK(base::SharedMemory::IsHandleValid(request_info->buffer->handle()));
 434     CHECK_GE(request_info->buffer_size, data_offset + data_length);
 435
 436     // Ensure that the SHM buffer remains valid for the duration of this scope.
 437     // It is possible for CancelPendingRequest() to be called before we exit
 438     // this scope.
 439     linked_ptr<base::SharedMemory> retain_buffer(request_info->buffer);
 440
 441     base::TimeTicks time_start = base::TimeTicks::Now();
 442
 443     const char* data_start = static_cast<char*>(request_info->buffer->memory());
 444     CHECK(data_start);
 445     CHECK(data_start + data_offset);
 446     const char* data_ptr = data_start + data_offset;
 447
 448     // Check whether this response data is compliant with our cross-site
 449     // document blocking policy. We only do this for the first packet.
 450     std::string alternative_data;
 451     if (request_info->site_isolation_metadata.get()) {
 452       request_info->blocked_response =
 453           SiteIsolationPolicy::ShouldBlockResponse(
 454               request_info->site_isolation_metadata, data_ptr, data_length,
 455               &alternative_data);
 456       request_info->site_isolation_metadata.reset();
 457
 458       // When the response is blocked we may have any alternative data to
 459       // send to the renderer. When |alternative_data| is zero-sized, we do not
 460       // call peer's callback.
 461       if (request_info->blocked_response && !alternative_data.empty()) {
 462         data_ptr = alternative_data.data();
 463         data_length = alternative_data.size();
 464         encoded_data_length = alternative_data.size();
 465       }
 466     }
 467
 468     if (!request_info->blocked_response || !alternative_data.empty()) {
 469       if (request_info->threaded_data_provider) {
 470         request_info->threaded_data_provider->OnReceivedDataOnForegroundThread(
 471             data_ptr, data_length, encoded_data_length);
 472         // A threaded data provider will take care of its own ACKing, as the
 473         // data may be processed later on another thread.
 474         send_ack = false;
 475       } else {
 476         request_info->peer->OnReceivedData(
 477             data_ptr, data_length, encoded_data_length);
 478       }
 479     }
 480
 481     UMA_HISTOGRAM_TIMES("ResourceDispatcher.OnReceivedDataTime",
 482                         base::TimeTicks::Now() - time_start);
 483   }
 484
 485   // Acknowledge the reception of this data.
 486   if (send_ack)
 487     message_sender_->Send(new ResourceHostMsg_DataReceived_ACK(request_id));
 488 }
 489
 490 void ResourceDispatcher::OnDownloadedData(int request_id,
 491                                           int data_len,
 492                                           int encoded_data_length) {
 493   // Acknowledge the reception of this message.
 494   message_sender_->Send(new ResourceHostMsg_DataDownloaded_ACK(request_id));
 495
 496   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 497   if (!request_info)
 498     return;
 499
 500   request_info->peer->OnDownloadedData(data_len, encoded_data_length);
 501 }
 502
 503 void ResourceDispatcher::OnReceivedRedirect(
 504     int request_id,
 505     const net::RedirectInfo& redirect_info,
 506     const ResourceResponseHead& response_head) {
 507   TRACE_EVENT0("loader", "ResourceDispatcher::OnReceivedRedirect");
 508   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 509   if (!request_info)
 510     return;
 511   request_info->response_start = ConsumeIOTimestamp();
 512
 513   ResourceResponseInfo renderer_response_info;
 514   ToResourceResponseInfo(*request_info, response_head, &renderer_response_info);
 515   if (request_info->peer->OnReceivedRedirect(redirect_info,
 516                                              renderer_response_info)) {
 517     // Double-check if the request is still around. The call above could
 518     // potentially remove it.
 519     request_info = GetPendingRequestInfo(request_id);
 520     if (!request_info)
 521       return;
 522     // We update the response_url here so that we can send it to
 523     // SiteIsolationPolicy later when OnReceivedResponse is called.
 524     request_info->response_url = redirect_info.new_url;
 525     request_info->pending_redirect_message.reset(
 526         new ResourceHostMsg_FollowRedirect(request_id));
 527     if (!request_info->is_deferred) {
 528       FollowPendingRedirect(request_id, *request_info);
 529     }
 530   } else {
 531     CancelPendingRequest(request_id);
 532   }
 533 }
 534
 535 void ResourceDispatcher::FollowPendingRedirect(
 536     int request_id,
 537     PendingRequestInfo& request_info) {
 538   IPC::Message* msg = request_info.pending_redirect_message.release();
 539   if (msg)
 540     message_sender_->Send(msg);
 541 }
 542
 543 void ResourceDispatcher::OnRequestComplete(
 544     int request_id,
 545     const ResourceMsg_RequestCompleteData& request_complete_data) {
 546   TRACE_EVENT0("loader", "ResourceDispatcher::OnRequestComplete");
 547
 548   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 549   if (!request_info)
 550     return;
 551   request_info->completion_time = ConsumeIOTimestamp();
 552   request_info->buffer.reset();
 553   request_info->buffer_size = 0;
 554
 555   RequestPeer* peer = request_info->peer;
 556
 557   if (delegate_) {
 558     RequestPeer* new_peer =
 559         delegate_->OnRequestComplete(
 560             request_info->peer, request_info->resource_type,
 561             request_complete_data.error_code);
 562     if (new_peer)
 563       request_info->peer = new_peer;
 564   }
 565
 566   base::TimeTicks renderer_completion_time = ToRendererCompletionTime(
 567       *request_info, request_complete_data.completion_time);
 568   // The request ID will be removed from our pending list in the destructor.
 569   // Normally, dispatching this message causes the reference-counted request to
 570   // die immediately.
 571   peer->OnCompletedRequest(request_complete_data.error_code,
 572                            request_complete_data.was_ignored_by_handler,
 573                            request_complete_data.exists_in_cache,
 574                            request_complete_data.security_info,
 575                            renderer_completion_time,
 576                            request_complete_data.encoded_data_length);
 577 }
 578
 579 int ResourceDispatcher::AddPendingRequest(RequestPeer* callback,
 580                                           ResourceType resource_type,
 581                                           int origin_pid,
 582                                           const GURL& frame_origin,
 583                                           const GURL& request_url,
 584                                           bool download_to_file) {
 585   // Compute a unique request_id for this renderer process.
 586   int id = MakeRequestID();
 587   pending_requests_[id] = PendingRequestInfo(callback,
 588                                              resource_type,
 589                                              origin_pid,
 590                                              frame_origin,
 591                                              request_url,
 592                                              download_to_file);
 593   return id;
 594 }
 595
 596 bool ResourceDispatcher::RemovePendingRequest(int request_id) {
 597   PendingRequestList::iterator it = pending_requests_.find(request_id);
 598   if (it == pending_requests_.end())
 599     return false;
 600
 601   PendingRequestInfo& request_info = it->second;
 602
 603   bool release_downloaded_file = request_info.download_to_file;
 604
 605   ReleaseResourcesInMessageQueue(&request_info.deferred_message_queue);
 606   pending_requests_.erase(it);
 607
 608   if (release_downloaded_file) {
 609     message_sender_->Send(
 610         new ResourceHostMsg_ReleaseDownloadedFile(request_id));
 611   }
 612
 613   return true;
 614 }
 615
 616 void ResourceDispatcher::CancelPendingRequest(int request_id) {
 617   PendingRequestList::iterator it = pending_requests_.find(request_id);
 618   if (it == pending_requests_.end()) {
 619     DVLOG(1) << "unknown request";
 620     return;
 621   }
 622
 623   // Cancel the request, and clean it up so the bridge will receive no more
 624   // messages.
 625   message_sender_->Send(new ResourceHostMsg_CancelRequest(request_id));
 626   RemovePendingRequest(request_id);
 627 }
 628
 629 void ResourceDispatcher::SetDefersLoading(int request_id, bool value) {
 630   PendingRequestList::iterator it = pending_requests_.find(request_id);
 631   if (it == pending_requests_.end()) {
 632     DLOG(ERROR) << "unknown request";
 633     return;
 634   }
 635   PendingRequestInfo& request_info = it->second;
 636   if (value) {
 637     request_info.is_deferred = value;
 638   } else if (request_info.is_deferred) {
 639     request_info.is_deferred = false;
 640
 641     FollowPendingRedirect(request_id, request_info);
 642
 643     base::MessageLoop::current()->PostTask(
 644         FROM_HERE,
 645         base::Bind(&ResourceDispatcher::FlushDeferredMessages,
 646                    weak_factory_.GetWeakPtr(),
 647                    request_id));
 648   }
 649 }
 650
 651 void ResourceDispatcher::DidChangePriority(int request_id,
 652                                            net::RequestPriority new_priority,
 653                                            int intra_priority_value) {
 654   DCHECK(ContainsKey(pending_requests_, request_id));
 655   message_sender_->Send(new ResourceHostMsg_DidChangePriority(
 656       request_id, new_priority, intra_priority_value));
 657 }
 658
 659 bool ResourceDispatcher::AttachThreadedDataReceiver(
 660     int request_id, blink::WebThreadedDataReceiver* threaded_data_receiver) {
 661   PendingRequestInfo* request_info = GetPendingRequestInfo(request_id);
 662   DCHECK(request_info);
 663
 664   if (request_info->buffer != NULL) {
 665     DCHECK(!request_info->threaded_data_provider);
 666     request_info->threaded_data_provider = new ThreadedDataProvider(
 667         request_id, threaded_data_receiver, request_info->buffer,
 668         request_info->buffer_size);
 669     return true;
 670   }
 671
 672   return false;
 673 }
 674
 675 ResourceDispatcher::PendingRequestInfo::PendingRequestInfo()
 676     : peer(NULL),
 677       threaded_data_provider(NULL),
 678       resource_type(RESOURCE_TYPE_SUB_RESOURCE),
 679       is_deferred(false),
 680       download_to_file(false),
 681       blocked_response(false),
 682       buffer_size(0) {
 683 }
 684
 685 ResourceDispatcher::PendingRequestInfo::PendingRequestInfo(
 686     RequestPeer* peer,
 687     ResourceType resource_type,
 688     int origin_pid,
 689     const GURL& frame_origin,
 690     const GURL& request_url,
 691     bool download_to_file)
 692     : peer(peer),
 693       threaded_data_provider(NULL),
 694       resource_type(resource_type),
 695       origin_pid(origin_pid),
 696       is_deferred(false),
 697       url(request_url),
 698       frame_origin(frame_origin),
 699       response_url(request_url),
 700       download_to_file(download_to_file),
 701       request_start(base::TimeTicks::Now()),
 702       blocked_response(false) {}
 703
 704 ResourceDispatcher::PendingRequestInfo::~PendingRequestInfo() {
 705   if (threaded_data_provider)
 706     threaded_data_provider->Stop();
 707 }
 708
 709 void ResourceDispatcher::DispatchMessage(const IPC::Message& message) {
 710   IPC_BEGIN_MESSAGE_MAP(ResourceDispatcher, message)
 711     IPC_MESSAGE_HANDLER(ResourceMsg_UploadProgress, OnUploadProgress)
 712     IPC_MESSAGE_HANDLER(ResourceMsg_ReceivedResponse, OnReceivedResponse)
 713     IPC_MESSAGE_HANDLER(ResourceMsg_ReceivedCachedMetadata,
 714                         OnReceivedCachedMetadata)
 715     IPC_MESSAGE_HANDLER(ResourceMsg_ReceivedRedirect, OnReceivedRedirect)
 716     IPC_MESSAGE_HANDLER(ResourceMsg_SetDataBuffer, OnSetDataBuffer)
 717     IPC_MESSAGE_HANDLER(ResourceMsg_DataReceived, OnReceivedData)
 718     IPC_MESSAGE_HANDLER(ResourceMsg_DataDownloaded, OnDownloadedData)
 719     IPC_MESSAGE_HANDLER(ResourceMsg_RequestComplete, OnRequestComplete)
 720   IPC_END_MESSAGE_MAP()
 721 }
 722
 723 void ResourceDispatcher::FlushDeferredMessages(int request_id) {
 724   PendingRequestList::iterator it = pending_requests_.find(request_id);
 725   if (it == pending_requests_.end())  // The request could have become invalid.
 726     return;
 727   PendingRequestInfo& request_info = it->second;
 728   if (request_info.is_deferred)
 729     return;
 730   // Because message handlers could result in request_info being destroyed,
 731   // we need to work with a stack reference to the deferred queue.
 732   MessageQueue q;
 733   q.swap(request_info.deferred_message_queue);
 734   while (!q.empty()) {
 735     IPC::Message* m = q.front();
 736     q.pop_front();
 737     DispatchMessage(*m);
 738     delete m;
 739     // If this request is deferred in the context of the above message, then
 740     // we should honor the same and stop dispatching further messages.
 741     // We need to find the request again in the list as it may have completed
 742     // by now and the request_info instance above may be invalid.
 743     PendingRequestList::iterator index = pending_requests_.find(request_id);
 744     if (index != pending_requests_.end()) {
 745       PendingRequestInfo& pending_request = index->second;
 746       if (pending_request.is_deferred) {
 747         pending_request.deferred_message_queue.swap(q);
 748         return;
 749       }
 750     }
 751   }
 752 }
 753
 754 ResourceLoaderBridge* ResourceDispatcher::CreateBridge(
 755     const RequestInfo& request_info) {
 756   return new IPCResourceLoaderBridge(this, request_info);
 757 }
 758
 759 void ResourceDispatcher::ToResourceResponseInfo(
 760     const PendingRequestInfo& request_info,
 761     const ResourceResponseHead& browser_info,
 762     ResourceResponseInfo* renderer_info) const {
 763   *renderer_info = browser_info;
 764   if (request_info.request_start.is_null() ||
 765       request_info.response_start.is_null() ||
 766       browser_info.request_start.is_null() ||
 767       browser_info.response_start.is_null() ||
 768       browser_info.load_timing.request_start.is_null()) {
 769     return;
 770   }
 771   InterProcessTimeTicksConverter converter(
 772       LocalTimeTicks::FromTimeTicks(request_info.request_start),
 773       LocalTimeTicks::FromTimeTicks(request_info.response_start),
 774       RemoteTimeTicks::FromTimeTicks(browser_info.request_start),
 775       RemoteTimeTicks::FromTimeTicks(browser_info.response_start));
 776
 777   net::LoadTimingInfo* load_timing = &renderer_info->load_timing;
 778   RemoteToLocalTimeTicks(converter, &load_timing->request_start);
 779   RemoteToLocalTimeTicks(converter, &load_timing->proxy_resolve_start);
 780   RemoteToLocalTimeTicks(converter, &load_timing->proxy_resolve_end);
 781   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.dns_start);
 782   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.dns_end);
 783   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.connect_start);
 784   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.connect_end);
 785   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.ssl_start);
 786   RemoteToLocalTimeTicks(converter, &load_timing->connect_timing.ssl_end);
 787   RemoteToLocalTimeTicks(converter, &load_timing->send_start);
 788   RemoteToLocalTimeTicks(converter, &load_timing->send_end);
 789   RemoteToLocalTimeTicks(converter, &load_timing->receive_headers_end);
 790   RemoteToLocalTimeTicks(converter,
 791                          &renderer_info->service_worker_fetch_start);
 792   RemoteToLocalTimeTicks(converter,
 793                          &renderer_info->service_worker_fetch_ready);
 794   RemoteToLocalTimeTicks(converter,
 795                          &renderer_info->service_worker_fetch_end);
 796
 797   // Collect UMA on the inter-process skew.
 798   bool is_skew_additive = false;
 799   if (converter.IsSkewAdditiveForMetrics()) {
 800     is_skew_additive = true;
 801     base::TimeDelta skew = converter.GetSkewForMetrics();
 802     if (skew >= base::TimeDelta()) {
 803       UMA_HISTOGRAM_TIMES(
 804           "InterProcessTimeTicks.BrowserAhead_BrowserToRenderer", skew);
 805     } else {
 806       UMA_HISTOGRAM_TIMES(
 807           "InterProcessTimeTicks.BrowserBehind_BrowserToRenderer", -skew);
 808     }
 809   }
 810   UMA_HISTOGRAM_BOOLEAN(
 811       "InterProcessTimeTicks.IsSkewAdditive_BrowserToRenderer",
 812       is_skew_additive);
 813 }
 814
 815 base::TimeTicks ResourceDispatcher::ToRendererCompletionTime(
 816     const PendingRequestInfo& request_info,
 817     const base::TimeTicks& browser_completion_time) const {
 818   if (request_info.completion_time.is_null()) {
 819     return browser_completion_time;
 820   }
 821
 822   // TODO(simonjam): The optimal lower bound should be the most recent value of
 823   // TimeTicks::Now() returned to WebKit. Is it worth trying to cache that?
 824   // Until then, |response_start| is used as it is the most recent value
 825   // returned for this request.
 826   int64 result = std::max(browser_completion_time.ToInternalValue(),
 827                           request_info.response_start.ToInternalValue());
 828   result = std::min(result, request_info.completion_time.ToInternalValue());
 829   return base::TimeTicks::FromInternalValue(result);
 830 }
 831
 832 base::TimeTicks ResourceDispatcher::ConsumeIOTimestamp() {
 833   if (io_timestamp_ == base::TimeTicks())
 834     return base::TimeTicks::Now();
 835   base::TimeTicks result = io_timestamp_;
 836   io_timestamp_ = base::TimeTicks();
 837   return result;
 838 }
 839
 840 // static
 841 bool ResourceDispatcher::IsResourceDispatcherMessage(
 842     const IPC::Message& message) {
 843   switch (message.type()) {
 844     case ResourceMsg_UploadProgress::ID:
 845     case ResourceMsg_ReceivedResponse::ID:
 846     case ResourceMsg_ReceivedCachedMetadata::ID:
 847     case ResourceMsg_ReceivedRedirect::ID:
 848     case ResourceMsg_SetDataBuffer::ID:
 849     case ResourceMsg_DataReceived::ID:
 850     case ResourceMsg_DataDownloaded::ID:
 851     case ResourceMsg_RequestComplete::ID:
 852       return true;
 853
 854     default:
 855       break;
 856   }
 857
 858   return false;
 859 }
 860
 861 // static
 862 void ResourceDispatcher::ReleaseResourcesInDataMessage(
 863     const IPC::Message& message) {
 864   PickleIterator iter(message);
 865   int request_id;
 866   if (!message.ReadInt(&iter, &request_id)) {
 867     NOTREACHED() << "malformed resource message";
 868     return;
 869   }
 870
 871   // If the message contains a shared memory handle, we should close the handle
 872   // or there will be a memory leak.
 873   if (message.type() == ResourceMsg_SetDataBuffer::ID) {
 874     base::SharedMemoryHandle shm_handle;
 875     if (IPC::ParamTraits<base::SharedMemoryHandle>::Read(&message,
 876                                                          &iter,
 877                                                          &shm_handle)) {
 878       if (base::SharedMemory::IsHandleValid(shm_handle))
 879         base::SharedMemory::CloseHandle(shm_handle);
 880     }
 881   }
 882 }
 883
 884 // static
 885 void ResourceDispatcher::ReleaseResourcesInMessageQueue(MessageQueue* queue) {
 886   while (!queue->empty()) {
 887     IPC::Message* message = queue->front();
 888     ReleaseResourcesInDataMessage(*message);
 889     queue->pop_front();
 890     delete message;
 891   }
 892 }
 893
 894 }  // namespace content