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