content/browser/loader/async_resource_handler.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 #include "content/browser/loader/async_resource_handler.h"
   6
   7 #include <algorithm>
   8 #include <vector>
   9
  10 #include "base/command_line.h"
  11 #include "base/containers/hash_tables.h"
  12 #include "base/debug/alias.h"
  13 #include "base/logging.h"
  14 #include "base/memory/shared_memory.h"
  15 #include "base/metrics/histogram.h"
  16 #include "base/strings/string_number_conversions.h"
  17 #include "base/time/time.h"
  18 #include "content/browser/devtools/devtools_netlog_observer.h"
  19 #include "content/browser/host_zoom_map_impl.h"
  20 #include "content/browser/loader/resource_buffer.h"
  21 #include "content/browser/loader/resource_dispatcher_host_impl.h"
  22 #include "content/browser/loader/resource_message_filter.h"
  23 #include "content/browser/loader/resource_request_info_impl.h"
  24 #include "content/browser/resource_context_impl.h"
  25 #include "content/common/resource_messages.h"
  26 #include "content/common/view_messages.h"
  27 #include "content/public/browser/resource_dispatcher_host_delegate.h"
  28 #include "content/public/common/resource_response.h"
  29 #include "net/base/io_buffer.h"
  30 #include "net/base/load_flags.h"
  31 #include "net/base/net_log.h"
  32 #include "net/base/net_util.h"
  33 #include "net/url_request/redirect_info.h"
  34
  35 using base::TimeTicks;
  36
  37 namespace content {
  38 namespace {
  39
  40 static int kBufferSize = 1024 * 512;
  41 static int kMinAllocationSize = 1024 * 4;
  42 static int kMaxAllocationSize = 1024 * 32;
  43
  44 void GetNumericArg(const std::string& name, int* result) {
  45   const std::string& value =
  46       base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(name);
  47   if (!value.empty())
  48     base::StringToInt(value, result);
  49 }
  50
  51 void InitializeResourceBufferConstants() {
  52   static bool did_init = false;
  53   if (did_init)
  54     return;
  55   did_init = true;
  56
  57   GetNumericArg("resource-buffer-size", &kBufferSize);
  58   GetNumericArg("resource-buffer-min-allocation-size", &kMinAllocationSize);
  59   GetNumericArg("resource-buffer-max-allocation-size", &kMaxAllocationSize);
  60 }
  61
  62 int CalcUsedPercentage(int bytes_read, int buffer_size) {
  63   double ratio = static_cast<double>(bytes_read) / buffer_size;
  64   return static_cast<int>(ratio * 100.0 + 0.5);  // Round to nearest integer.
  65 }
  66
  67 }  // namespace
  68
  69 class DependentIOBuffer : public net::WrappedIOBuffer {
  70  public:
  71   DependentIOBuffer(ResourceBuffer* backing, char* memory)
  72       : net::WrappedIOBuffer(memory),
  73         backing_(backing) {
  74   }
  75  private:
  76   ~DependentIOBuffer() override {}
  77   scoped_refptr<ResourceBuffer> backing_;
  78 };
  79
  80 AsyncResourceHandler::AsyncResourceHandler(
  81     net::URLRequest* request,
  82     ResourceDispatcherHostImpl* rdh)
  83     : ResourceHandler(request),
  84       ResourceMessageDelegate(request),
  85       rdh_(rdh),
  86       pending_data_count_(0),
  87       allocation_size_(0),
  88       did_defer_(false),
  89       has_checked_for_sufficient_resources_(false),
  90       sent_received_response_msg_(false),
  91       sent_first_data_msg_(false),
  92       reported_transfer_size_(0) {
  93   InitializeResourceBufferConstants();
  94 }
  95
  96 AsyncResourceHandler::~AsyncResourceHandler() {
  97   if (has_checked_for_sufficient_resources_)
  98     rdh_->FinishedWithResourcesForRequest(request());
  99 }
 100
 101 bool AsyncResourceHandler::OnMessageReceived(const IPC::Message& message) {
 102   bool handled = true;
 103   IPC_BEGIN_MESSAGE_MAP(AsyncResourceHandler, message)
 104     IPC_MESSAGE_HANDLER(ResourceHostMsg_FollowRedirect, OnFollowRedirect)
 105     IPC_MESSAGE_HANDLER(ResourceHostMsg_DataReceived_ACK, OnDataReceivedACK)
 106     IPC_MESSAGE_UNHANDLED(handled = false)
 107   IPC_END_MESSAGE_MAP()
 108   return handled;
 109 }
 110
 111 void AsyncResourceHandler::OnFollowRedirect(int request_id) {
 112   if (!request()->status().is_success()) {
 113     DVLOG(1) << "OnFollowRedirect for invalid request";
 114     return;
 115   }
 116
 117   if (!redirect_start_time_.is_null()) {
 118     UMA_HISTOGRAM_TIMES("Net.AsyncResourceHandler_RedirectHopTime",
 119                         TimeTicks::Now() - redirect_start_time_);
 120     // Reset start time.
 121     redirect_start_time_ = TimeTicks();
 122   }
 123
 124   ResumeIfDeferred();
 125 }
 126
 127 void AsyncResourceHandler::OnDataReceivedACK(int request_id) {
 128   if (pending_data_count_) {
 129     --pending_data_count_;
 130
 131     buffer_->RecycleLeastRecentlyAllocated();
 132     if (buffer_->CanAllocate())
 133       ResumeIfDeferred();
 134   }
 135 }
 136
 137 bool AsyncResourceHandler::OnUploadProgress(uint64 position,
 138                                             uint64 size) {
 139   ResourceMessageFilter* filter = GetFilter();
 140   if (!filter)
 141     return false;
 142   return filter->Send(
 143       new ResourceMsg_UploadProgress(GetRequestID(), position, size));
 144 }
 145
 146 bool AsyncResourceHandler::OnRequestRedirected(
 147     const net::RedirectInfo& redirect_info,
 148     ResourceResponse* response,
 149     bool* defer) {
 150   const ResourceRequestInfoImpl* info = GetRequestInfo();
 151   if (!info->filter())
 152     return false;
 153
 154   redirect_start_time_ = TimeTicks::Now();
 155
 156   *defer = did_defer_ = true;
 157   OnDefer();
 158
 159   if (rdh_->delegate()) {
 160     rdh_->delegate()->OnRequestRedirected(
 161         redirect_info.new_url, request(), info->GetContext(), response);
 162   }
 163
 164   DevToolsNetLogObserver::PopulateResponseInfo(request(), response);
 165   response->head.encoded_data_length = request()->GetTotalReceivedBytes();
 166   reported_transfer_size_ = 0;
 167   response->head.request_start = request()->creation_time();
 168   response->head.response_start = TimeTicks::Now();
 169   // TODO(davidben): Is it necessary to pass the new first party URL for
 170   // cookies? The only case where it can change is top-level navigation requests
 171   // and hopefully those will eventually all be owned by the browser. It's
 172   // possible this is still needed while renderer-owned ones exist.
 173   return info->filter()->Send(new ResourceMsg_ReceivedRedirect(
 174       GetRequestID(), redirect_info, response->head));
 175 }
 176
 177 bool AsyncResourceHandler::OnResponseStarted(ResourceResponse* response,
 178                                              bool* defer) {
 179   // For changes to the main frame, inform the renderer of the new URL's
 180   // per-host settings before the request actually commits.  This way the
 181   // renderer will be able to set these precisely at the time the
 182   // request commits, avoiding the possibility of e.g. zooming the old content
 183   // or of having to layout the new content twice.
 184
 185   const ResourceRequestInfoImpl* info = GetRequestInfo();
 186   if (!info->filter())
 187     return false;
 188
 189   if (rdh_->delegate()) {
 190     rdh_->delegate()->OnResponseStarted(
 191         request(), info->GetContext(), response, info->filter());
 192   }
 193
 194   DevToolsNetLogObserver::PopulateResponseInfo(request(), response);
 195
 196   const HostZoomMap* host_zoom_map = info->filter()->GetHostZoomMap();
 197
 198   if (info->GetResourceType() == RESOURCE_TYPE_MAIN_FRAME && host_zoom_map) {
 199     const GURL& request_url = request()->url();
 200     info->filter()->Send(new ViewMsg_SetZoomLevelForLoadingURL(
 201         info->GetRouteID(),
 202         request_url, host_zoom_map->GetZoomLevelForHostAndScheme(
 203             request_url.scheme(),
 204             net::GetHostOrSpecFromURL(request_url))));
 205   }
 206
 207   // If the parent handler downloaded the resource to a file, grant the child
 208   // read permissions on it.
 209   if (!response->head.download_file_path.empty()) {
 210     rdh_->RegisterDownloadedTempFile(
 211         info->GetChildID(), info->GetRequestID(),
 212         response->head.download_file_path);
 213   }
 214
 215   response->head.request_start = request()->creation_time();
 216   response->head.response_start = TimeTicks::Now();
 217   info->filter()->Send(new ResourceMsg_ReceivedResponse(GetRequestID(),
 218                                                         response->head));
 219   sent_received_response_msg_ = true;
 220
 221   if (request()->response_info().metadata.get()) {
 222     std::vector<char> copy(request()->response_info().metadata->data(),
 223                            request()->response_info().metadata->data() +
 224                                request()->response_info().metadata->size());
 225     info->filter()->Send(new ResourceMsg_ReceivedCachedMetadata(GetRequestID(),
 226                                                                 copy));
 227   }
 228
 229   return true;
 230 }
 231
 232 bool AsyncResourceHandler::OnWillStart(const GURL& url, bool* defer) {
 233   return true;
 234 }
 235
 236 bool AsyncResourceHandler::OnBeforeNetworkStart(const GURL& url, bool* defer) {
 237   return true;
 238 }
 239
 240 bool AsyncResourceHandler::OnWillRead(scoped_refptr<net::IOBuffer>* buf,
 241                                       int* buf_size,
 242                                       int min_size) {
 243   DCHECK_EQ(-1, min_size);
 244
 245   if (!EnsureResourceBufferIsInitialized())
 246     return false;
 247
 248   DCHECK(buffer_->CanAllocate());
 249   char* memory = buffer_->Allocate(&allocation_size_);
 250   CHECK(memory);
 251
 252   *buf = new DependentIOBuffer(buffer_.get(), memory);
 253   *buf_size = allocation_size_;
 254
 255   UMA_HISTOGRAM_CUSTOM_COUNTS(
 256       "Net.AsyncResourceHandler_SharedIOBuffer_Alloc",
 257       *buf_size, 0, kMaxAllocationSize, 100);
 258   return true;
 259 }
 260
 261 bool AsyncResourceHandler::OnReadCompleted(int bytes_read, bool* defer) {
 262   DCHECK_GE(bytes_read, 0);
 263
 264   if (!bytes_read)
 265     return true;
 266
 267   ResourceMessageFilter* filter = GetFilter();
 268   if (!filter)
 269     return false;
 270
 271   buffer_->ShrinkLastAllocation(bytes_read);
 272
 273   UMA_HISTOGRAM_CUSTOM_COUNTS(
 274       "Net.AsyncResourceHandler_SharedIOBuffer_Used",
 275       bytes_read, 0, kMaxAllocationSize, 100);
 276   UMA_HISTOGRAM_PERCENTAGE(
 277       "Net.AsyncResourceHandler_SharedIOBuffer_UsedPercentage",
 278       CalcUsedPercentage(bytes_read, allocation_size_));
 279
 280   if (!sent_first_data_msg_) {
 281     base::SharedMemoryHandle handle;
 282     int size;
 283     if (!buffer_->ShareToProcess(filter->PeerHandle(), &handle, &size))
 284       return false;
 285     filter->Send(new ResourceMsg_SetDataBuffer(
 286         GetRequestID(), handle, size, filter->peer_pid()));
 287     sent_first_data_msg_ = true;
 288   }
 289
 290   int data_offset = buffer_->GetLastAllocationOffset();
 291
 292   int64_t current_transfer_size = request()->GetTotalReceivedBytes();
 293   int encoded_data_length = current_transfer_size - reported_transfer_size_;
 294   reported_transfer_size_ = current_transfer_size;
 295
 296   filter->Send(new ResourceMsg_DataReceived(
 297       GetRequestID(), data_offset, bytes_read, encoded_data_length));
 298   ++pending_data_count_;
 299   UMA_HISTOGRAM_CUSTOM_COUNTS(
 300       "Net.AsyncResourceHandler_PendingDataCount",
 301       pending_data_count_, 0, 100, 100);
 302
 303   if (!buffer_->CanAllocate()) {
 304     UMA_HISTOGRAM_CUSTOM_COUNTS(
 305         "Net.AsyncResourceHandler_PendingDataCount_WhenFull",
 306         pending_data_count_, 0, 100, 100);
 307     *defer = did_defer_ = true;
 308     OnDefer();
 309   }
 310
 311   return true;
 312 }
 313
 314 void AsyncResourceHandler::OnDataDownloaded(int bytes_downloaded) {
 315   int64_t current_transfer_size = request()->GetTotalReceivedBytes();
 316   int encoded_data_length = current_transfer_size - reported_transfer_size_;
 317   reported_transfer_size_ = current_transfer_size;
 318
 319   ResourceMessageFilter* filter = GetFilter();
 320   if (filter) {
 321     filter->Send(new ResourceMsg_DataDownloaded(
 322         GetRequestID(), bytes_downloaded, encoded_data_length));
 323   }
 324 }
 325
 326 void AsyncResourceHandler::OnResponseCompleted(
 327     const net::URLRequestStatus& status,
 328     const std::string& security_info,
 329     bool* defer) {
 330   const ResourceRequestInfoImpl* info = GetRequestInfo();
 331   if (!info->filter())
 332     return;
 333
 334   // If we crash here, figure out what URL the renderer was requesting.
 335   // http://crbug.com/107692
 336   char url_buf[128];
 337   base::strlcpy(url_buf, request()->url().spec().c_str(), arraysize(url_buf));
 338   base::debug::Alias(url_buf);
 339
 340   // TODO(gavinp): Remove this CHECK when we figure out the cause of
 341   // http://crbug.com/124680 . This check mirrors closely check in
 342   // WebURLLoaderImpl::OnCompletedRequest that routes this message to a WebCore
 343   // ResourceHandleInternal which asserts on its state and crashes. By crashing
 344   // when the message is sent, we should get better crash reports.
 345   CHECK(status.status() != net::URLRequestStatus::SUCCESS ||
 346         sent_received_response_msg_);
 347
 348   int error_code = status.error();
 349   bool was_ignored_by_handler = info->WasIgnoredByHandler();
 350
 351   DCHECK(status.status() != net::URLRequestStatus::IO_PENDING);
 352   // If this check fails, then we're in an inconsistent state because all
 353   // requests ignored by the handler should be canceled (which should result in
 354   // the ERR_ABORTED error code).
 355   DCHECK(!was_ignored_by_handler || error_code == net::ERR_ABORTED);
 356
 357   // TODO(mkosiba): Fix up cases where we create a URLRequestStatus
 358   // with a status() != SUCCESS and an error_code() == net::OK.
 359   if (status.status() == net::URLRequestStatus::CANCELED &&
 360       error_code == net::OK) {
 361     error_code = net::ERR_ABORTED;
 362   } else if (status.status() == net::URLRequestStatus::FAILED &&
 363              error_code == net::OK) {
 364     error_code = net::ERR_FAILED;
 365   }
 366
 367   ResourceMsg_RequestCompleteData request_complete_data;
 368   request_complete_data.error_code = error_code;
 369   request_complete_data.was_ignored_by_handler = was_ignored_by_handler;
 370   request_complete_data.exists_in_cache = request()->response_info().was_cached;
 371   request_complete_data.security_info = security_info;
 372   request_complete_data.completion_time = TimeTicks::Now();
 373   request_complete_data.encoded_data_length =
 374       request()->GetTotalReceivedBytes();
 375   info->filter()->Send(
 376       new ResourceMsg_RequestComplete(GetRequestID(), request_complete_data));
 377 }
 378
 379 bool AsyncResourceHandler::EnsureResourceBufferIsInitialized() {
 380   if (buffer_.get() && buffer_->IsInitialized())
 381     return true;
 382
 383   if (!has_checked_for_sufficient_resources_) {
 384     has_checked_for_sufficient_resources_ = true;
 385     if (!rdh_->HasSufficientResourcesForRequest(request())) {
 386       controller()->CancelWithError(net::ERR_INSUFFICIENT_RESOURCES);
 387       return false;
 388     }
 389   }
 390
 391   buffer_ = new ResourceBuffer();
 392   return buffer_->Initialize(kBufferSize,
 393                              kMinAllocationSize,
 394                              kMaxAllocationSize);
 395 }
 396
 397 void AsyncResourceHandler::ResumeIfDeferred() {
 398   if (did_defer_) {
 399     did_defer_ = false;
 400     request()->LogUnblocked();
 401     controller()->Resume();
 402   }
 403 }
 404
 405 void AsyncResourceHandler::OnDefer() {
 406   request()->LogBlockedBy("AsyncResourceHandler");
 407 }
 408
 409 }  // namespace content