net/spdy/spdy_session.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 "net/spdy/spdy_session.h"
   6
   7 #include <algorithm>
   8 #include <map>
   9
  10 #include "base/basictypes.h"
  11 #include "base/bind.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/logging.h"
  14 #include "base/message_loop/message_loop.h"
  15 #include "base/metrics/field_trial.h"
  16 #include "base/metrics/histogram.h"
  17 #include "base/metrics/sparse_histogram.h"
  18 #include "base/profiler/scoped_tracker.h"
  19 #include "base/stl_util.h"
  20 #include "base/strings/string_number_conversions.h"
  21 #include "base/strings/string_util.h"
  22 #include "base/strings/stringprintf.h"
  23 #include "base/strings/utf_string_conversions.h"
  24 #include "base/time/time.h"
  25 #include "base/values.h"
  26 #include "crypto/ec_private_key.h"
  27 #include "crypto/ec_signature_creator.h"
  28 #include "net/base/connection_type_histograms.h"
  29 #include "net/base/net_util.h"
  30 #include "net/cert/asn1_util.h"
  31 #include "net/cert/cert_verify_result.h"
  32 #include "net/http/http_log_util.h"
  33 #include "net/http/http_network_session.h"
  34 #include "net/http/http_server_properties.h"
  35 #include "net/http/http_util.h"
  36 #include "net/http/transport_security_state.h"
  37 #include "net/log/net_log.h"
  38 #include "net/socket/ssl_client_socket.h"
  39 #include "net/spdy/spdy_buffer_producer.h"
  40 #include "net/spdy/spdy_frame_builder.h"
  41 #include "net/spdy/spdy_http_utils.h"
  42 #include "net/spdy/spdy_protocol.h"
  43 #include "net/spdy/spdy_session_pool.h"
  44 #include "net/spdy/spdy_stream.h"
  45 #include "net/ssl/channel_id_service.h"
  46 #include "net/ssl/ssl_cipher_suite_names.h"
  47 #include "net/ssl/ssl_connection_status_flags.h"
  48
  49 namespace net {
  50
  51 namespace {
  52
  53 const int kReadBufferSize = 8 * 1024;
  54 const int kDefaultConnectionAtRiskOfLossSeconds = 10;
  55 const int kHungIntervalSeconds = 10;
  56
  57 // Minimum seconds that unclaimed pushed streams will be kept in memory.
  58 const int kMinPushedStreamLifetimeSeconds = 300;
  59
  60 scoped_ptr<base::ListValue> SpdyHeaderBlockToListValue(
  61     const SpdyHeaderBlock& headers,
  62     net::NetLog::LogLevel log_level) {
  63   scoped_ptr<base::ListValue> headers_list(new base::ListValue());
  64   for (SpdyHeaderBlock::const_iterator it = headers.begin();
  65        it != headers.end(); ++it) {
  66     headers_list->AppendString(
  67         it->first + ": " +
  68         ElideHeaderValueForNetLog(log_level, it->first, it->second));
  69   }
  70   return headers_list.Pass();
  71 }
  72
  73 base::Value* NetLogSpdySynStreamSentCallback(const SpdyHeaderBlock* headers,
  74                                              bool fin,
  75                                              bool unidirectional,
  76                                              SpdyPriority spdy_priority,
  77                                              SpdyStreamId stream_id,
  78                                              NetLog::LogLevel log_level) {
  79   base::DictionaryValue* dict = new base::DictionaryValue();
  80   dict->Set("headers",
  81             SpdyHeaderBlockToListValue(*headers, log_level).release());
  82   dict->SetBoolean("fin", fin);
  83   dict->SetBoolean("unidirectional", unidirectional);
  84   dict->SetInteger("priority", static_cast<int>(spdy_priority));
  85   dict->SetInteger("stream_id", stream_id);
  86   return dict;
  87 }
  88
  89 base::Value* NetLogSpdySynStreamReceivedCallback(
  90     const SpdyHeaderBlock* headers,
  91     bool fin,
  92     bool unidirectional,
  93     SpdyPriority spdy_priority,
  94     SpdyStreamId stream_id,
  95     SpdyStreamId associated_stream,
  96     NetLog::LogLevel log_level) {
  97   base::DictionaryValue* dict = new base::DictionaryValue();
  98   dict->Set("headers",
  99             SpdyHeaderBlockToListValue(*headers, log_level).release());
 100   dict->SetBoolean("fin", fin);
 101   dict->SetBoolean("unidirectional", unidirectional);
 102   dict->SetInteger("priority", static_cast<int>(spdy_priority));
 103   dict->SetInteger("stream_id", stream_id);
 104   dict->SetInteger("associated_stream", associated_stream);
 105   return dict;
 106 }
 107
 108 base::Value* NetLogSpdySynReplyOrHeadersReceivedCallback(
 109     const SpdyHeaderBlock* headers,
 110     bool fin,
 111     SpdyStreamId stream_id,
 112     NetLog::LogLevel log_level) {
 113   base::DictionaryValue* dict = new base::DictionaryValue();
 114   dict->Set("headers",
 115             SpdyHeaderBlockToListValue(*headers, log_level).release());
 116   dict->SetBoolean("fin", fin);
 117   dict->SetInteger("stream_id", stream_id);
 118   return dict;
 119 }
 120
 121 base::Value* NetLogSpdySessionCloseCallback(int net_error,
 122                                             const std::string* description,
 123                                             NetLog::LogLevel /* log_level */) {
 124   base::DictionaryValue* dict = new base::DictionaryValue();
 125   dict->SetInteger("net_error", net_error);
 126   dict->SetString("description", *description);
 127   return dict;
 128 }
 129
 130 base::Value* NetLogSpdySessionCallback(const HostPortProxyPair* host_pair,
 131                                        NetLog::LogLevel /* log_level */) {
 132   base::DictionaryValue* dict = new base::DictionaryValue();
 133   dict->SetString("host", host_pair->first.ToString());
 134   dict->SetString("proxy", host_pair->second.ToPacString());
 135   return dict;
 136 }
 137
 138 base::Value* NetLogSpdyInitializedCallback(NetLog::Source source,
 139                                            const NextProto protocol_version,
 140                                            NetLog::LogLevel /* log_level */) {
 141   base::DictionaryValue* dict = new base::DictionaryValue();
 142   if (source.IsValid()) {
 143     source.AddToEventParameters(dict);
 144   }
 145   dict->SetString("protocol",
 146                   SSLClientSocket::NextProtoToString(protocol_version));
 147   return dict;
 148 }
 149
 150 base::Value* NetLogSpdySettingsCallback(const HostPortPair& host_port_pair,
 151                                         bool clear_persisted,
 152                                         NetLog::LogLevel /* log_level */) {
 153   base::DictionaryValue* dict = new base::DictionaryValue();
 154   dict->SetString("host", host_port_pair.ToString());
 155   dict->SetBoolean("clear_persisted", clear_persisted);
 156   return dict;
 157 }
 158
 159 base::Value* NetLogSpdySettingCallback(SpdySettingsIds id,
 160                                        const SpdyMajorVersion protocol_version,
 161                                        SpdySettingsFlags flags,
 162                                        uint32 value,
 163                                        NetLog::LogLevel /* log_level */) {
 164   base::DictionaryValue* dict = new base::DictionaryValue();
 165   dict->SetInteger("id",
 166                    SpdyConstants::SerializeSettingId(protocol_version, id));
 167   dict->SetInteger("flags", flags);
 168   dict->SetInteger("value", value);
 169   return dict;
 170 }
 171
 172 base::Value* NetLogSpdySendSettingsCallback(
 173     const SettingsMap* settings,
 174     const SpdyMajorVersion protocol_version,
 175     NetLog::LogLevel /* log_level */) {
 176   base::DictionaryValue* dict = new base::DictionaryValue();
 177   base::ListValue* settings_list = new base::ListValue();
 178   for (SettingsMap::const_iterator it = settings->begin();
 179        it != settings->end(); ++it) {
 180     const SpdySettingsIds id = it->first;
 181     const SpdySettingsFlags flags = it->second.first;
 182     const uint32 value = it->second.second;
 183     settings_list->Append(new base::StringValue(base::StringPrintf(
 184         "[id:%u flags:%u value:%u]",
 185         SpdyConstants::SerializeSettingId(protocol_version, id),
 186         flags,
 187         value)));
 188   }
 189   dict->Set("settings", settings_list);
 190   return dict;
 191 }
 192
 193 base::Value* NetLogSpdyWindowUpdateFrameCallback(
 194     SpdyStreamId stream_id,
 195     uint32 delta,
 196     NetLog::LogLevel /* log_level */) {
 197   base::DictionaryValue* dict = new base::DictionaryValue();
 198   dict->SetInteger("stream_id", static_cast<int>(stream_id));
 199   dict->SetInteger("delta", delta);
 200   return dict;
 201 }
 202
 203 base::Value* NetLogSpdySessionWindowUpdateCallback(
 204     int32 delta,
 205     int32 window_size,
 206     NetLog::LogLevel /* log_level */) {
 207   base::DictionaryValue* dict = new base::DictionaryValue();
 208   dict->SetInteger("delta", delta);
 209   dict->SetInteger("window_size", window_size);
 210   return dict;
 211 }
 212
 213 base::Value* NetLogSpdyDataCallback(SpdyStreamId stream_id,
 214                                     int size,
 215                                     bool fin,
 216                                     NetLog::LogLevel /* log_level */) {
 217   base::DictionaryValue* dict = new base::DictionaryValue();
 218   dict->SetInteger("stream_id", static_cast<int>(stream_id));
 219   dict->SetInteger("size", size);
 220   dict->SetBoolean("fin", fin);
 221   return dict;
 222 }
 223
 224 base::Value* NetLogSpdyRstCallback(SpdyStreamId stream_id,
 225                                    int status,
 226                                    const std::string* description,
 227                                    NetLog::LogLevel /* log_level */) {
 228   base::DictionaryValue* dict = new base::DictionaryValue();
 229   dict->SetInteger("stream_id", static_cast<int>(stream_id));
 230   dict->SetInteger("status", status);
 231   dict->SetString("description", *description);
 232   return dict;
 233 }
 234
 235 base::Value* NetLogSpdyPingCallback(SpdyPingId unique_id,
 236                                     bool is_ack,
 237                                     const char* type,
 238                                     NetLog::LogLevel /* log_level */) {
 239   base::DictionaryValue* dict = new base::DictionaryValue();
 240   dict->SetInteger("unique_id", static_cast<int>(unique_id));
 241   dict->SetString("type", type);
 242   dict->SetBoolean("is_ack", is_ack);
 243   return dict;
 244 }
 245
 246 base::Value* NetLogSpdyGoAwayCallback(SpdyStreamId last_stream_id,
 247                                       int active_streams,
 248                                       int unclaimed_streams,
 249                                       SpdyGoAwayStatus status,
 250                                       NetLog::LogLevel /* log_level */) {
 251   base::DictionaryValue* dict = new base::DictionaryValue();
 252   dict->SetInteger("last_accepted_stream_id",
 253                    static_cast<int>(last_stream_id));
 254   dict->SetInteger("active_streams", active_streams);
 255   dict->SetInteger("unclaimed_streams", unclaimed_streams);
 256   dict->SetInteger("status", static_cast<int>(status));
 257   return dict;
 258 }
 259
 260 base::Value* NetLogSpdyPushPromiseReceivedCallback(
 261     const SpdyHeaderBlock* headers,
 262     SpdyStreamId stream_id,
 263     SpdyStreamId promised_stream_id,
 264     NetLog::LogLevel log_level) {
 265   base::DictionaryValue* dict = new base::DictionaryValue();
 266   dict->Set("headers",
 267             SpdyHeaderBlockToListValue(*headers, log_level).release());
 268   dict->SetInteger("id", stream_id);
 269   dict->SetInteger("promised_stream_id", promised_stream_id);
 270   return dict;
 271 }
 272
 273 base::Value* NetLogSpdyAdoptedPushStreamCallback(
 274     SpdyStreamId stream_id, const GURL* url, NetLog::LogLevel log_level) {
 275   base::DictionaryValue* dict = new base::DictionaryValue();
 276   dict->SetInteger("stream_id", stream_id);
 277   dict->SetString("url", url->spec());
 278   return dict;
 279 }
 280
 281 // Helper function to return the total size of an array of objects
 282 // with .size() member functions.
 283 template <typename T, size_t N> size_t GetTotalSize(const T (&arr)[N]) {
 284   size_t total_size = 0;
 285   for (size_t i = 0; i < N; ++i) {
 286     total_size += arr[i].size();
 287   }
 288   return total_size;
 289 }
 290
 291 // Helper class for std:find_if on STL container containing
 292 // SpdyStreamRequest weak pointers.
 293 class RequestEquals {
 294  public:
 295   RequestEquals(const base::WeakPtr<SpdyStreamRequest>& request)
 296       : request_(request) {}
 297
 298   bool operator()(const base::WeakPtr<SpdyStreamRequest>& request) const {
 299     return request_.get() == request.get();
 300   }
 301
 302  private:
 303   const base::WeakPtr<SpdyStreamRequest> request_;
 304 };
 305
 306 // The maximum number of concurrent streams we will ever create.  Even if
 307 // the server permits more, we will never exceed this limit.
 308 const size_t kMaxConcurrentStreamLimit = 256;
 309
 310 }  // namespace
 311
 312 SpdyProtocolErrorDetails MapFramerErrorToProtocolError(
 313     SpdyFramer::SpdyError err) {
 314   switch(err) {
 315     case SpdyFramer::SPDY_NO_ERROR:
 316       return SPDY_ERROR_NO_ERROR;
 317     case SpdyFramer::SPDY_INVALID_CONTROL_FRAME:
 318       return SPDY_ERROR_INVALID_CONTROL_FRAME;
 319     case SpdyFramer::SPDY_CONTROL_PAYLOAD_TOO_LARGE:
 320       return SPDY_ERROR_CONTROL_PAYLOAD_TOO_LARGE;
 321     case SpdyFramer::SPDY_ZLIB_INIT_FAILURE:
 322       return SPDY_ERROR_ZLIB_INIT_FAILURE;
 323     case SpdyFramer::SPDY_UNSUPPORTED_VERSION:
 324       return SPDY_ERROR_UNSUPPORTED_VERSION;
 325     case SpdyFramer::SPDY_DECOMPRESS_FAILURE:
 326       return SPDY_ERROR_DECOMPRESS_FAILURE;
 327     case SpdyFramer::SPDY_COMPRESS_FAILURE:
 328       return SPDY_ERROR_COMPRESS_FAILURE;
 329     case SpdyFramer::SPDY_GOAWAY_FRAME_CORRUPT:
 330       return SPDY_ERROR_GOAWAY_FRAME_CORRUPT;
 331     case SpdyFramer::SPDY_RST_STREAM_FRAME_CORRUPT:
 332       return SPDY_ERROR_RST_STREAM_FRAME_CORRUPT;
 333     case SpdyFramer::SPDY_INVALID_DATA_FRAME_FLAGS:
 334       return SPDY_ERROR_INVALID_DATA_FRAME_FLAGS;
 335     case SpdyFramer::SPDY_INVALID_CONTROL_FRAME_FLAGS:
 336       return SPDY_ERROR_INVALID_CONTROL_FRAME_FLAGS;
 337     case SpdyFramer::SPDY_UNEXPECTED_FRAME:
 338       return SPDY_ERROR_UNEXPECTED_FRAME;
 339     default:
 340       NOTREACHED();
 341       return static_cast<SpdyProtocolErrorDetails>(-1);
 342   }
 343 }
 344
 345 Error MapFramerErrorToNetError(SpdyFramer::SpdyError err) {
 346   switch (err) {
 347     case SpdyFramer::SPDY_NO_ERROR:
 348       return OK;
 349     case SpdyFramer::SPDY_INVALID_CONTROL_FRAME:
 350       return ERR_SPDY_PROTOCOL_ERROR;
 351     case SpdyFramer::SPDY_CONTROL_PAYLOAD_TOO_LARGE:
 352       return ERR_SPDY_FRAME_SIZE_ERROR;
 353     case SpdyFramer::SPDY_ZLIB_INIT_FAILURE:
 354       return ERR_SPDY_COMPRESSION_ERROR;
 355     case SpdyFramer::SPDY_UNSUPPORTED_VERSION:
 356       return ERR_SPDY_PROTOCOL_ERROR;
 357     case SpdyFramer::SPDY_DECOMPRESS_FAILURE:
 358       return ERR_SPDY_COMPRESSION_ERROR;
 359     case SpdyFramer::SPDY_COMPRESS_FAILURE:
 360       return ERR_SPDY_COMPRESSION_ERROR;
 361     case SpdyFramer::SPDY_GOAWAY_FRAME_CORRUPT:
 362       return ERR_SPDY_PROTOCOL_ERROR;
 363     case SpdyFramer::SPDY_RST_STREAM_FRAME_CORRUPT:
 364       return ERR_SPDY_PROTOCOL_ERROR;
 365     case SpdyFramer::SPDY_INVALID_DATA_FRAME_FLAGS:
 366       return ERR_SPDY_PROTOCOL_ERROR;
 367     case SpdyFramer::SPDY_INVALID_CONTROL_FRAME_FLAGS:
 368       return ERR_SPDY_PROTOCOL_ERROR;
 369     case SpdyFramer::SPDY_UNEXPECTED_FRAME:
 370       return ERR_SPDY_PROTOCOL_ERROR;
 371     default:
 372       NOTREACHED();
 373       return ERR_SPDY_PROTOCOL_ERROR;
 374   }
 375 }
 376
 377 SpdyProtocolErrorDetails MapRstStreamStatusToProtocolError(
 378     SpdyRstStreamStatus status) {
 379   switch(status) {
 380     case RST_STREAM_PROTOCOL_ERROR:
 381       return STATUS_CODE_PROTOCOL_ERROR;
 382     case RST_STREAM_INVALID_STREAM:
 383       return STATUS_CODE_INVALID_STREAM;
 384     case RST_STREAM_REFUSED_STREAM:
 385       return STATUS_CODE_REFUSED_STREAM;
 386     case RST_STREAM_UNSUPPORTED_VERSION:
 387       return STATUS_CODE_UNSUPPORTED_VERSION;
 388     case RST_STREAM_CANCEL:
 389       return STATUS_CODE_CANCEL;
 390     case RST_STREAM_INTERNAL_ERROR:
 391       return STATUS_CODE_INTERNAL_ERROR;
 392     case RST_STREAM_FLOW_CONTROL_ERROR:
 393       return STATUS_CODE_FLOW_CONTROL_ERROR;
 394     case RST_STREAM_STREAM_IN_USE:
 395       return STATUS_CODE_STREAM_IN_USE;
 396     case RST_STREAM_STREAM_ALREADY_CLOSED:
 397       return STATUS_CODE_STREAM_ALREADY_CLOSED;
 398     case RST_STREAM_INVALID_CREDENTIALS:
 399       return STATUS_CODE_INVALID_CREDENTIALS;
 400     case RST_STREAM_FRAME_SIZE_ERROR:
 401       return STATUS_CODE_FRAME_SIZE_ERROR;
 402     case RST_STREAM_SETTINGS_TIMEOUT:
 403       return STATUS_CODE_SETTINGS_TIMEOUT;
 404     case RST_STREAM_CONNECT_ERROR:
 405       return STATUS_CODE_CONNECT_ERROR;
 406     case RST_STREAM_ENHANCE_YOUR_CALM:
 407       return STATUS_CODE_ENHANCE_YOUR_CALM;
 408     case RST_STREAM_INADEQUATE_SECURITY:
 409       return STATUS_CODE_INADEQUATE_SECURITY;
 410     case RST_STREAM_HTTP_1_1_REQUIRED:
 411       return STATUS_CODE_HTTP_1_1_REQUIRED;
 412     default:
 413       NOTREACHED();
 414       return static_cast<SpdyProtocolErrorDetails>(-1);
 415   }
 416 }
 417
 418 SpdyGoAwayStatus MapNetErrorToGoAwayStatus(Error err) {
 419   switch (err) {
 420     case OK:
 421       return GOAWAY_NO_ERROR;
 422     case ERR_SPDY_PROTOCOL_ERROR:
 423       return GOAWAY_PROTOCOL_ERROR;
 424     case ERR_SPDY_FLOW_CONTROL_ERROR:
 425       return GOAWAY_FLOW_CONTROL_ERROR;
 426     case ERR_SPDY_FRAME_SIZE_ERROR:
 427       return GOAWAY_FRAME_SIZE_ERROR;
 428     case ERR_SPDY_COMPRESSION_ERROR:
 429       return GOAWAY_COMPRESSION_ERROR;
 430     case ERR_SPDY_INADEQUATE_TRANSPORT_SECURITY:
 431       return GOAWAY_INADEQUATE_SECURITY;
 432     default:
 433       return GOAWAY_PROTOCOL_ERROR;
 434   }
 435 }
 436
 437 void SplitPushedHeadersToRequestAndResponse(const SpdyHeaderBlock& headers,
 438                                             SpdyMajorVersion protocol_version,
 439                                             SpdyHeaderBlock* request_headers,
 440                                             SpdyHeaderBlock* response_headers) {
 441   DCHECK(response_headers);
 442   DCHECK(request_headers);
 443   for (SpdyHeaderBlock::const_iterator it = headers.begin();
 444        it != headers.end();
 445        ++it) {
 446     SpdyHeaderBlock* to_insert = response_headers;
 447     if (protocol_version == SPDY2) {
 448       if (it->first == "url")
 449         to_insert = request_headers;
 450     } else {
 451       const char* host = protocol_version >= SPDY4 ? ":authority" : ":host";
 452       static const char scheme[] = ":scheme";
 453       static const char path[] = ":path";
 454       if (it->first == host || it->first == scheme || it->first == path)
 455         to_insert = request_headers;
 456     }
 457     to_insert->insert(*it);
 458   }
 459 }
 460
 461 SpdyStreamRequest::SpdyStreamRequest() : weak_ptr_factory_(this) {
 462   Reset();
 463 }
 464
 465 SpdyStreamRequest::~SpdyStreamRequest() {
 466   CancelRequest();
 467 }
 468
 469 int SpdyStreamRequest::StartRequest(
 470     SpdyStreamType type,
 471     const base::WeakPtr<SpdySession>& session,
 472     const GURL& url,
 473     RequestPriority priority,
 474     const BoundNetLog& net_log,
 475     const CompletionCallback& callback) {
 476   DCHECK(session);
 477   DCHECK(!session_);
 478   DCHECK(!stream_);
 479   DCHECK(callback_.is_null());
 480
 481   type_ = type;
 482   session_ = session;
 483   url_ = url;
 484   priority_ = priority;
 485   net_log_ = net_log;
 486   callback_ = callback;
 487
 488   base::WeakPtr<SpdyStream> stream;
 489   int rv = session->TryCreateStream(weak_ptr_factory_.GetWeakPtr(), &stream);
 490   if (rv == OK) {
 491     Reset();
 492     stream_ = stream;
 493   }
 494   return rv;
 495 }
 496
 497 void SpdyStreamRequest::CancelRequest() {
 498   if (session_)
 499     session_->CancelStreamRequest(weak_ptr_factory_.GetWeakPtr());
 500   Reset();
 501   // Do this to cancel any pending CompleteStreamRequest() tasks.
 502   weak_ptr_factory_.InvalidateWeakPtrs();
 503 }
 504
 505 base::WeakPtr<SpdyStream> SpdyStreamRequest::ReleaseStream() {
 506   DCHECK(!session_);
 507   base::WeakPtr<SpdyStream> stream = stream_;
 508   DCHECK(stream);
 509   Reset();
 510   return stream;
 511 }
 512
 513 void SpdyStreamRequest::OnRequestCompleteSuccess(
 514     const base::WeakPtr<SpdyStream>& stream) {
 515   DCHECK(session_);
 516   DCHECK(!stream_);
 517   DCHECK(!callback_.is_null());
 518   CompletionCallback callback = callback_;
 519   Reset();
 520   DCHECK(stream);
 521   stream_ = stream;
 522   callback.Run(OK);
 523 }
 524
 525 void SpdyStreamRequest::OnRequestCompleteFailure(int rv) {
 526   DCHECK(session_);
 527   DCHECK(!stream_);
 528   DCHECK(!callback_.is_null());
 529   CompletionCallback callback = callback_;
 530   Reset();
 531   DCHECK_NE(rv, OK);
 532   callback.Run(rv);
 533 }
 534
 535 void SpdyStreamRequest::Reset() {
 536   type_ = SPDY_BIDIRECTIONAL_STREAM;
 537   session_.reset();
 538   stream_.reset();
 539   url_ = GURL();
 540   priority_ = MINIMUM_PRIORITY;
 541   net_log_ = BoundNetLog();
 542   callback_.Reset();
 543 }
 544
 545 SpdySession::ActiveStreamInfo::ActiveStreamInfo()
 546     : stream(NULL),
 547       waiting_for_syn_reply(false) {}
 548
 549 SpdySession::ActiveStreamInfo::ActiveStreamInfo(SpdyStream* stream)
 550     : stream(stream),
 551       waiting_for_syn_reply(stream->type() != SPDY_PUSH_STREAM) {
 552 }
 553
 554 SpdySession::ActiveStreamInfo::~ActiveStreamInfo() {}
 555
 556 SpdySession::PushedStreamInfo::PushedStreamInfo() : stream_id(0) {}
 557
 558 SpdySession::PushedStreamInfo::PushedStreamInfo(
 559     SpdyStreamId stream_id,
 560     base::TimeTicks creation_time)
 561     : stream_id(stream_id),
 562       creation_time(creation_time) {}
 563
 564 SpdySession::PushedStreamInfo::~PushedStreamInfo() {}
 565
 566 // static
 567 bool SpdySession::CanPool(TransportSecurityState* transport_security_state,
 568                           const SSLInfo& ssl_info,
 569                           const std::string& old_hostname,
 570                           const std::string& new_hostname) {
 571   // Pooling is prohibited if the server cert is not valid for the new domain,
 572   // and for connections on which client certs were sent. It is also prohibited
 573   // when channel ID was sent if the hosts are from different eTLDs+1.
 574   if (IsCertStatusError(ssl_info.cert_status))
 575     return false;
 576
 577   if (ssl_info.client_cert_sent)
 578     return false;
 579
 580   if (ssl_info.channel_id_sent &&
 581       ChannelIDService::GetDomainForHost(new_hostname) !=
 582       ChannelIDService::GetDomainForHost(old_hostname)) {
 583     return false;
 584   }
 585
 586   bool unused = false;
 587   if (!ssl_info.cert->VerifyNameMatch(new_hostname, &unused))
 588     return false;
 589
 590   std::string pinning_failure_log;
 591   if (!transport_security_state->CheckPublicKeyPins(
 592           new_hostname,
 593           ssl_info.is_issued_by_known_root,
 594           ssl_info.public_key_hashes,
 595           &pinning_failure_log)) {
 596     return false;
 597   }
 598
 599   return true;
 600 }
 601
 602 SpdySession::SpdySession(
 603     const SpdySessionKey& spdy_session_key,
 604     const base::WeakPtr<HttpServerProperties>& http_server_properties,
 605     TransportSecurityState* transport_security_state,
 606     bool verify_domain_authentication,
 607     bool enable_sending_initial_data,
 608     bool enable_compression,
 609     bool enable_ping_based_connection_checking,
 610     NextProto default_protocol,
 611     size_t session_max_recv_window_size,
 612     size_t stream_max_recv_window_size,
 613     size_t initial_max_concurrent_streams,
 614     size_t max_concurrent_streams_limit,
 615     TimeFunc time_func,
 616     const HostPortPair& trusted_spdy_proxy,
 617     NetLog* net_log)
 618     : in_io_loop_(false),
 619       spdy_session_key_(spdy_session_key),
 620       pool_(NULL),
 621       http_server_properties_(http_server_properties),
 622       transport_security_state_(transport_security_state),
 623       read_buffer_(new IOBuffer(kReadBufferSize)),
 624       stream_hi_water_mark_(kFirstStreamId),
 625       last_accepted_push_stream_id_(0),
 626       num_pushed_streams_(0u),
 627       num_active_pushed_streams_(0u),
 628       in_flight_write_frame_type_(DATA),
 629       in_flight_write_frame_size_(0),
 630       is_secure_(false),
 631       certificate_error_code_(OK),
 632       availability_state_(STATE_AVAILABLE),
 633       read_state_(READ_STATE_DO_READ),
 634       write_state_(WRITE_STATE_IDLE),
 635       error_on_close_(OK),
 636       max_concurrent_streams_(initial_max_concurrent_streams == 0
 637                                   ? kInitialMaxConcurrentStreams
 638                                   : initial_max_concurrent_streams),
 639       max_concurrent_streams_limit_(max_concurrent_streams_limit == 0
 640                                         ? kMaxConcurrentStreamLimit
 641                                         : max_concurrent_streams_limit),
 642       max_concurrent_pushed_streams_(kMaxConcurrentPushedStreams),
 643       streams_initiated_count_(0),
 644       streams_pushed_count_(0),
 645       streams_pushed_and_claimed_count_(0),
 646       streams_abandoned_count_(0),
 647       total_bytes_received_(0),
 648       sent_settings_(false),
 649       received_settings_(false),
 650       stalled_streams_(0),
 651       pings_in_flight_(0),
 652       next_ping_id_(1),
 653       last_activity_time_(time_func()),
 654       last_compressed_frame_len_(0),
 655       check_ping_status_pending_(false),
 656       send_connection_header_prefix_(false),
 657       flow_control_state_(FLOW_CONTROL_NONE),
 658       session_send_window_size_(0),
 659       session_max_recv_window_size_(session_max_recv_window_size),
 660       session_recv_window_size_(0),
 661       session_unacked_recv_window_bytes_(0),
 662       stream_initial_send_window_size_(GetInitialWindowSize(default_protocol)),
 663       stream_max_recv_window_size_(stream_max_recv_window_size),
 664       net_log_(BoundNetLog::Make(net_log, NetLog::SOURCE_HTTP2_SESSION)),
 665       verify_domain_authentication_(verify_domain_authentication),
 666       enable_sending_initial_data_(enable_sending_initial_data),
 667       enable_compression_(enable_compression),
 668       enable_ping_based_connection_checking_(
 669           enable_ping_based_connection_checking),
 670       protocol_(default_protocol),
 671       connection_at_risk_of_loss_time_(
 672           base::TimeDelta::FromSeconds(kDefaultConnectionAtRiskOfLossSeconds)),
 673       hung_interval_(base::TimeDelta::FromSeconds(kHungIntervalSeconds)),
 674       trusted_spdy_proxy_(trusted_spdy_proxy),
 675       time_func_(time_func),
 676       weak_factory_(this) {
 677   DCHECK_GE(protocol_, kProtoSPDYMinimumVersion);
 678   DCHECK_LE(protocol_, kProtoSPDYMaximumVersion);
 679   DCHECK(HttpStreamFactory::spdy_enabled());
 680   net_log_.BeginEvent(
 681       NetLog::TYPE_HTTP2_SESSION,
 682       base::Bind(&NetLogSpdySessionCallback, &host_port_proxy_pair()));
 683   next_unclaimed_push_stream_sweep_time_ = time_func_() +
 684       base::TimeDelta::FromSeconds(kMinPushedStreamLifetimeSeconds);
 685   // TODO(mbelshe): consider randomization of the stream_hi_water_mark.
 686 }
 687
 688 SpdySession::~SpdySession() {
 689   CHECK(!in_io_loop_);
 690   DcheckDraining();
 691
 692   // TODO(akalin): Check connection->is_initialized() instead. This
 693   // requires re-working CreateFakeSpdySession(), though.
 694   DCHECK(connection_->socket());
 695   // With SPDY we can't recycle sockets.
 696   connection_->socket()->Disconnect();
 697
 698   RecordHistograms();
 699
 700   net_log_.EndEvent(NetLog::TYPE_HTTP2_SESSION);
 701 }
 702
 703 void SpdySession::InitializeWithSocket(
 704     scoped_ptr<ClientSocketHandle> connection,
 705     SpdySessionPool* pool,
 706     bool is_secure,
 707     int certificate_error_code) {
 708   CHECK(!in_io_loop_);
 709   DCHECK_EQ(availability_state_, STATE_AVAILABLE);
 710   DCHECK_EQ(read_state_, READ_STATE_DO_READ);
 711   DCHECK_EQ(write_state_, WRITE_STATE_IDLE);
 712   DCHECK(!connection_);
 713
 714   DCHECK(certificate_error_code == OK ||
 715          certificate_error_code < ERR_IO_PENDING);
 716   // TODO(akalin): Check connection->is_initialized() instead. This
 717   // requires re-working CreateFakeSpdySession(), though.
 718   DCHECK(connection->socket());
 719
 720   connection_ = connection.Pass();
 721   is_secure_ = is_secure;
 722   certificate_error_code_ = certificate_error_code;
 723
 724   NextProto protocol_negotiated =
 725       connection_->socket()->GetNegotiatedProtocol();
 726   if (protocol_negotiated != kProtoUnknown) {
 727     protocol_ = protocol_negotiated;
 728     stream_initial_send_window_size_ = GetInitialWindowSize(protocol_);
 729   }
 730   DCHECK_GE(protocol_, kProtoSPDYMinimumVersion);
 731   DCHECK_LE(protocol_, kProtoSPDYMaximumVersion);
 732
 733   if ((protocol_ >= kProtoSPDY4MinimumVersion) &&
 734       (protocol_ <= kProtoSPDY4MaximumVersion))
 735     send_connection_header_prefix_ = true;
 736
 737   if (protocol_ >= kProtoSPDY31) {
 738     flow_control_state_ = FLOW_CONTROL_STREAM_AND_SESSION;
 739     session_send_window_size_ = GetInitialWindowSize(protocol_);
 740     session_recv_window_size_ = GetInitialWindowSize(protocol_);
 741   } else if (protocol_ >= kProtoSPDY3) {
 742     flow_control_state_ = FLOW_CONTROL_STREAM;
 743   } else {
 744     flow_control_state_ = FLOW_CONTROL_NONE;
 745   }
 746
 747   buffered_spdy_framer_.reset(
 748       new BufferedSpdyFramer(NextProtoToSpdyMajorVersion(protocol_),
 749                              enable_compression_));
 750   buffered_spdy_framer_->set_visitor(this);
 751   buffered_spdy_framer_->set_debug_visitor(this);
 752   UMA_HISTOGRAM_ENUMERATION(
 753       "Net.SpdyVersion2",
 754       protocol_ - kProtoSPDYHistogramOffset,
 755       kProtoSPDYMaximumVersion - kProtoSPDYMinimumVersion + 1);
 756
 757   net_log_.AddEvent(
 758       NetLog::TYPE_HTTP2_SESSION_INITIALIZED,
 759       base::Bind(&NetLogSpdyInitializedCallback,
 760                  connection_->socket()->NetLog().source(), protocol_));
 761
 762   DCHECK_EQ(availability_state_, STATE_AVAILABLE);
 763   connection_->AddHigherLayeredPool(this);
 764   if (enable_sending_initial_data_)
 765     SendInitialData();
 766   pool_ = pool;
 767
 768   // Bootstrap the read loop.
 769   base::MessageLoop::current()->PostTask(
 770       FROM_HERE,
 771       base::Bind(&SpdySession::PumpReadLoop,
 772                  weak_factory_.GetWeakPtr(), READ_STATE_DO_READ, OK));
 773 }
 774
 775 bool SpdySession::VerifyDomainAuthentication(const std::string& domain) {
 776   if (!verify_domain_authentication_)
 777     return true;
 778
 779   if (availability_state_ == STATE_DRAINING)
 780     return false;
 781
 782   SSLInfo ssl_info;
 783   bool was_npn_negotiated;
 784   NextProto protocol_negotiated = kProtoUnknown;
 785   if (!GetSSLInfo(&ssl_info, &was_npn_negotiated, &protocol_negotiated))
 786     return true;   // This is not a secure session, so all domains are okay.
 787
 788   return CanPool(transport_security_state_, ssl_info,
 789                  host_port_pair().host(), domain);
 790 }
 791
 792 int SpdySession::GetPushStream(
 793     const GURL& url,
 794     base::WeakPtr<SpdyStream>* stream,
 795     const BoundNetLog& stream_net_log) {
 796   CHECK(!in_io_loop_);
 797
 798   stream->reset();
 799
 800   if (availability_state_ == STATE_DRAINING)
 801     return ERR_CONNECTION_CLOSED;
 802
 803   Error err = TryAccessStream(url);
 804   if (err != OK)
 805     return err;
 806
 807   *stream = GetActivePushStream(url);
 808   if (*stream) {
 809     DCHECK_LT(streams_pushed_and_claimed_count_, streams_pushed_count_);
 810     streams_pushed_and_claimed_count_++;
 811   }
 812   return OK;
 813 }
 814
 815 // {,Try}CreateStream() and TryAccessStream() can be called with
 816 // |in_io_loop_| set if a stream is being created in response to
 817 // another being closed due to received data.
 818
 819 Error SpdySession::TryAccessStream(const GURL& url) {
 820   if (is_secure_ && certificate_error_code_ != OK &&
 821       (url.SchemeIs("https") || url.SchemeIs("wss"))) {
 822     RecordProtocolErrorHistogram(
 823         PROTOCOL_ERROR_REQUEST_FOR_SECURE_CONTENT_OVER_INSECURE_SESSION);
 824     DoDrainSession(
 825         static_cast<Error>(certificate_error_code_),
 826         "Tried to get SPDY stream for secure content over an unauthenticated "
 827         "session.");
 828     return ERR_SPDY_PROTOCOL_ERROR;
 829   }
 830   return OK;
 831 }
 832
 833 int SpdySession::TryCreateStream(
 834     const base::WeakPtr<SpdyStreamRequest>& request,
 835     base::WeakPtr<SpdyStream>* stream) {
 836   DCHECK(request);
 837
 838   if (availability_state_ == STATE_GOING_AWAY)
 839     return ERR_FAILED;
 840
 841   if (availability_state_ == STATE_DRAINING)
 842     return ERR_CONNECTION_CLOSED;
 843
 844   Error err = TryAccessStream(request->url());
 845   if (err != OK)
 846     return err;
 847
 848   if (!max_concurrent_streams_ ||
 849       (active_streams_.size() + created_streams_.size() - num_pushed_streams_ <
 850        max_concurrent_streams_)) {
 851     return CreateStream(*request, stream);
 852   }
 853
 854   stalled_streams_++;
 855   net_log().AddEvent(NetLog::TYPE_HTTP2_SESSION_STALLED_MAX_STREAMS);
 856   RequestPriority priority = request->priority();
 857   CHECK_GE(priority, MINIMUM_PRIORITY);
 858   CHECK_LE(priority, MAXIMUM_PRIORITY);
 859   pending_create_stream_queues_[priority].push_back(request);
 860   return ERR_IO_PENDING;
 861 }
 862
 863 int SpdySession::CreateStream(const SpdyStreamRequest& request,
 864                               base::WeakPtr<SpdyStream>* stream) {
 865   DCHECK_GE(request.priority(), MINIMUM_PRIORITY);
 866   DCHECK_LE(request.priority(), MAXIMUM_PRIORITY);
 867
 868   if (availability_state_ == STATE_GOING_AWAY)
 869     return ERR_FAILED;
 870
 871   if (availability_state_ == STATE_DRAINING)
 872     return ERR_CONNECTION_CLOSED;
 873
 874   Error err = TryAccessStream(request.url());
 875   if (err != OK) {
 876     // This should have been caught in TryCreateStream().
 877     NOTREACHED();
 878     return err;
 879   }
 880
 881   DCHECK(connection_->socket());
 882   UMA_HISTOGRAM_BOOLEAN("Net.SpdySession.CreateStreamWithSocketConnected",
 883                         connection_->socket()->IsConnected());
 884   if (!connection_->socket()->IsConnected()) {
 885     DoDrainSession(
 886         ERR_CONNECTION_CLOSED,
 887         "Tried to create SPDY stream for a closed socket connection.");
 888     return ERR_CONNECTION_CLOSED;
 889   }
 890
 891   scoped_ptr<SpdyStream> new_stream(
 892       new SpdyStream(request.type(), GetWeakPtr(), request.url(),
 893                      request.priority(), stream_initial_send_window_size_,
 894                      stream_max_recv_window_size_, request.net_log()));
 895   *stream = new_stream->GetWeakPtr();
 896   InsertCreatedStream(new_stream.Pass());
 897
 898   UMA_HISTOGRAM_CUSTOM_COUNTS(
 899       "Net.SpdyPriorityCount",
 900       static_cast<int>(request.priority()), 0, 10, 11);
 901
 902   return OK;
 903 }
 904
 905 void SpdySession::CancelStreamRequest(
 906     const base::WeakPtr<SpdyStreamRequest>& request) {
 907   DCHECK(request);
 908   RequestPriority priority = request->priority();
 909   CHECK_GE(priority, MINIMUM_PRIORITY);
 910   CHECK_LE(priority, MAXIMUM_PRIORITY);
 911
 912 #if DCHECK_IS_ON()
 913   // |request| should not be in a queue not matching its priority.
 914   for (int i = MINIMUM_PRIORITY; i <= MAXIMUM_PRIORITY; ++i) {
 915     if (priority == i)
 916       continue;
 917     PendingStreamRequestQueue* queue = &pending_create_stream_queues_[i];
 918     DCHECK(std::find_if(queue->begin(),
 919                         queue->end(),
 920                         RequestEquals(request)) == queue->end());
 921   }
 922 #endif
 923
 924   PendingStreamRequestQueue* queue =
 925       &pending_create_stream_queues_[priority];
 926   // Remove |request| from |queue| while preserving the order of the
 927   // other elements.
 928   PendingStreamRequestQueue::iterator it =
 929       std::find_if(queue->begin(), queue->end(), RequestEquals(request));
 930   // The request may already be removed if there's a
 931   // CompleteStreamRequest() in flight.
 932   if (it != queue->end()) {
 933     it = queue->erase(it);
 934     // |request| should be in the queue at most once, and if it is
 935     // present, should not be pending completion.
 936     DCHECK(std::find_if(it, queue->end(), RequestEquals(request)) ==
 937            queue->end());
 938   }
 939 }
 940
 941 base::WeakPtr<SpdyStreamRequest> SpdySession::GetNextPendingStreamRequest() {
 942   for (int j = MAXIMUM_PRIORITY; j >= MINIMUM_PRIORITY; --j) {
 943     if (pending_create_stream_queues_[j].empty())
 944       continue;
 945
 946     base::WeakPtr<SpdyStreamRequest> pending_request =
 947         pending_create_stream_queues_[j].front();
 948     DCHECK(pending_request);
 949     pending_create_stream_queues_[j].pop_front();
 950     return pending_request;
 951   }
 952   return base::WeakPtr<SpdyStreamRequest>();
 953 }
 954
 955 void SpdySession::ProcessPendingStreamRequests() {
 956   // Like |max_concurrent_streams_|, 0 means infinite for
 957   // |max_requests_to_process|.
 958   size_t max_requests_to_process = 0;
 959   if (max_concurrent_streams_ != 0) {
 960     max_requests_to_process =
 961         max_concurrent_streams_ -
 962         (active_streams_.size() + created_streams_.size());
 963   }
 964   for (size_t i = 0;
 965        max_requests_to_process == 0 || i < max_requests_to_process; ++i) {
 966     base::WeakPtr<SpdyStreamRequest> pending_request =
 967         GetNextPendingStreamRequest();
 968     if (!pending_request)
 969       break;
 970
 971     // Note that this post can race with other stream creations, and it's
 972     // possible that the un-stalled stream will be stalled again if it loses.
 973     // TODO(jgraettinger): Provide stronger ordering guarantees.
 974     base::MessageLoop::current()->PostTask(
 975         FROM_HERE,
 976         base::Bind(&SpdySession::CompleteStreamRequest,
 977                    weak_factory_.GetWeakPtr(),
 978                    pending_request));
 979   }
 980 }
 981
 982 void SpdySession::AddPooledAlias(const SpdySessionKey& alias_key) {
 983   pooled_aliases_.insert(alias_key);
 984 }
 985
 986 SpdyMajorVersion SpdySession::GetProtocolVersion() const {
 987   DCHECK(buffered_spdy_framer_.get());
 988   return buffered_spdy_framer_->protocol_version();
 989 }
 990
 991 bool SpdySession::HasAcceptableTransportSecurity() const {
 992   // If we're not even using TLS, we have no standards to meet.
 993   if (!is_secure_) {
 994     return true;
 995   }
 996
 997   // We don't enforce transport security standards for older SPDY versions.
 998   if (GetProtocolVersion() < SPDY4) {
 999     return true;
1000   }
1001
1002   SSLInfo ssl_info;
1003   CHECK(connection_->socket()->GetSSLInfo(&ssl_info));
1004
1005   // HTTP/2 requires TLS 1.2+
1006   if (SSLConnectionStatusToVersion(ssl_info.connection_status) <
1007       SSL_CONNECTION_VERSION_TLS1_2) {
1008     return false;
1009   }
1010
1011   if (!IsSecureTLSCipherSuite(
1012           SSLConnectionStatusToCipherSuite(ssl_info.connection_status))) {
1013     return false;
1014   }
1015
1016   return true;
1017 }
1018
1019 base::WeakPtr<SpdySession> SpdySession::GetWeakPtr() {
1020   return weak_factory_.GetWeakPtr();
1021 }
1022
1023 bool SpdySession::CloseOneIdleConnection() {
1024   CHECK(!in_io_loop_);
1025   DCHECK(pool_);
1026   if (active_streams_.empty()) {
1027     DoDrainSession(ERR_CONNECTION_CLOSED, "Closing idle connection.");
1028   }
1029   // Return false as the socket wasn't immediately closed.
1030   return false;
1031 }
1032
1033 void SpdySession::EnqueueStreamWrite(
1034     const base::WeakPtr<SpdyStream>& stream,
1035     SpdyFrameType frame_type,
1036     scoped_ptr<SpdyBufferProducer> producer) {
1037   DCHECK(frame_type == HEADERS ||
1038          frame_type == DATA ||
1039          frame_type == CREDENTIAL ||
1040          frame_type == SYN_STREAM);
1041   EnqueueWrite(stream->priority(), frame_type, producer.Pass(), stream);
1042 }
1043
1044 scoped_ptr<SpdyFrame> SpdySession::CreateSynStream(
1045     SpdyStreamId stream_id,
1046     RequestPriority priority,
1047     SpdyControlFlags flags,
1048     const SpdyHeaderBlock& block) {
1049   ActiveStreamMap::const_iterator it = active_streams_.find(stream_id);
1050   CHECK(it != active_streams_.end());
1051   CHECK_EQ(it->second.stream->stream_id(), stream_id);
1052
1053   SendPrefacePingIfNoneInFlight();
1054
1055   DCHECK(buffered_spdy_framer_.get());
1056   SpdyPriority spdy_priority =
1057       ConvertRequestPriorityToSpdyPriority(priority, GetProtocolVersion());
1058
1059   scoped_ptr<SpdyFrame> syn_frame;
1060   // TODO(hkhalil): Avoid copy of |block|.
1061   if (GetProtocolVersion() <= SPDY3) {
1062     SpdySynStreamIR syn_stream(stream_id);
1063     syn_stream.set_associated_to_stream_id(0);
1064     syn_stream.set_priority(spdy_priority);
1065     syn_stream.set_fin((flags & CONTROL_FLAG_FIN) != 0);
1066     syn_stream.set_unidirectional((flags & CONTROL_FLAG_UNIDIRECTIONAL) != 0);
1067     syn_stream.set_name_value_block(block);
1068     syn_frame.reset(buffered_spdy_framer_->SerializeFrame(syn_stream));
1069   } else {
1070     SpdyHeadersIR headers(stream_id);
1071     headers.set_priority(spdy_priority);
1072     headers.set_has_priority(true);
1073     headers.set_fin((flags & CONTROL_FLAG_FIN) != 0);
1074     headers.set_name_value_block(block);
1075     syn_frame.reset(buffered_spdy_framer_->SerializeFrame(headers));
1076   }
1077
1078   streams_initiated_count_++;
1079
1080   if (net_log().IsLogging()) {
1081     const NetLog::EventType type =
1082         (GetProtocolVersion() <= SPDY3)
1083             ? NetLog::TYPE_HTTP2_SESSION_SYN_STREAM
1084             : NetLog::TYPE_HTTP2_SESSION_SEND_HEADERS;
1085     net_log().AddEvent(type,
1086                        base::Bind(&NetLogSpdySynStreamSentCallback, &block,
1087                                   (flags & CONTROL_FLAG_FIN) != 0,
1088                                   (flags & CONTROL_FLAG_UNIDIRECTIONAL) != 0,
1089                                   spdy_priority, stream_id));
1090   }
1091
1092   return syn_frame.Pass();
1093 }
1094
1095 scoped_ptr<SpdyBuffer> SpdySession::CreateDataBuffer(SpdyStreamId stream_id,
1096                                                      IOBuffer* data,
1097                                                      int len,
1098                                                      SpdyDataFlags flags) {
1099   if (availability_state_ == STATE_DRAINING) {
1100     return scoped_ptr<SpdyBuffer>();
1101   }
1102
1103   ActiveStreamMap::const_iterator it = active_streams_.find(stream_id);
1104   CHECK(it != active_streams_.end());
1105   SpdyStream* stream = it->second.stream;
1106   CHECK_EQ(stream->stream_id(), stream_id);
1107
1108   if (len < 0) {
1109     NOTREACHED();
1110     return scoped_ptr<SpdyBuffer>();
1111   }
1112
1113   int effective_len = std::min(len, kMaxSpdyFrameChunkSize);
1114
1115   bool send_stalled_by_stream =
1116       (flow_control_state_ >= FLOW_CONTROL_STREAM) &&
1117       (stream->send_window_size() <= 0);
1118   bool send_stalled_by_session = IsSendStalled();
1119
1120   // NOTE: There's an enum of the same name in histograms.xml.
1121   enum SpdyFrameFlowControlState {
1122     SEND_NOT_STALLED,
1123     SEND_STALLED_BY_STREAM,
1124     SEND_STALLED_BY_SESSION,
1125     SEND_STALLED_BY_STREAM_AND_SESSION,
1126   };
1127
1128   SpdyFrameFlowControlState frame_flow_control_state = SEND_NOT_STALLED;
1129   if (send_stalled_by_stream) {
1130     if (send_stalled_by_session) {
1131       frame_flow_control_state = SEND_STALLED_BY_STREAM_AND_SESSION;
1132     } else {
1133       frame_flow_control_state = SEND_STALLED_BY_STREAM;
1134     }
1135   } else if (send_stalled_by_session) {
1136     frame_flow_control_state = SEND_STALLED_BY_SESSION;
1137   }
1138
1139   if (flow_control_state_ == FLOW_CONTROL_STREAM) {
1140     UMA_HISTOGRAM_ENUMERATION(
1141         "Net.SpdyFrameStreamFlowControlState",
1142         frame_flow_control_state,
1143         SEND_STALLED_BY_STREAM + 1);
1144   } else if (flow_control_state_ == FLOW_CONTROL_STREAM_AND_SESSION) {
1145     UMA_HISTOGRAM_ENUMERATION(
1146         "Net.SpdyFrameStreamAndSessionFlowControlState",
1147         frame_flow_control_state,
1148         SEND_STALLED_BY_STREAM_AND_SESSION + 1);
1149   }
1150
1151   // Obey send window size of the stream if stream flow control is
1152   // enabled.
1153   if (flow_control_state_ >= FLOW_CONTROL_STREAM) {
1154     if (send_stalled_by_stream) {
1155       stream->set_send_stalled_by_flow_control(true);
1156       // Even though we're currently stalled only by the stream, we
1157       // might end up being stalled by the session also.
1158       QueueSendStalledStream(*stream);
1159       net_log().AddEvent(
1160           NetLog::TYPE_HTTP2_SESSION_STREAM_STALLED_BY_STREAM_SEND_WINDOW,
1161           NetLog::IntegerCallback("stream_id", stream_id));
1162       return scoped_ptr<SpdyBuffer>();
1163     }
1164
1165     effective_len = std::min(effective_len, stream->send_window_size());
1166   }
1167
1168   // Obey send window size of the session if session flow control is
1169   // enabled.
1170   if (flow_control_state_ == FLOW_CONTROL_STREAM_AND_SESSION) {
1171     if (send_stalled_by_session) {
1172       stream->set_send_stalled_by_flow_control(true);
1173       QueueSendStalledStream(*stream);
1174       net_log().AddEvent(
1175           NetLog::TYPE_HTTP2_SESSION_STREAM_STALLED_BY_SESSION_SEND_WINDOW,
1176           NetLog::IntegerCallback("stream_id", stream_id));
1177       return scoped_ptr<SpdyBuffer>();
1178     }
1179
1180     effective_len = std::min(effective_len, session_send_window_size_);
1181   }
1182
1183   DCHECK_GE(effective_len, 0);
1184
1185   // Clear FIN flag if only some of the data will be in the data
1186   // frame.
1187   if (effective_len < len)
1188     flags = static_cast<SpdyDataFlags>(flags & ~DATA_FLAG_FIN);
1189
1190   if (net_log().IsLogging()) {
1191     net_log().AddEvent(NetLog::TYPE_HTTP2_SESSION_SEND_DATA,
1192                        base::Bind(&NetLogSpdyDataCallback, stream_id,
1193                                   effective_len, (flags & DATA_FLAG_FIN) != 0));
1194   }
1195
1196   // Send PrefacePing for DATA_FRAMEs with nonzero payload size.
1197   if (effective_len > 0)
1198     SendPrefacePingIfNoneInFlight();
1199
1200   // TODO(mbelshe): reduce memory copies here.
1201   DCHECK(buffered_spdy_framer_.get());
1202   scoped_ptr<SpdyFrame> frame(
1203       buffered_spdy_framer_->CreateDataFrame(
1204           stream_id, data->data(),
1205           static_cast<uint32>(effective_len), flags));
1206
1207   scoped_ptr<SpdyBuffer> data_buffer(new SpdyBuffer(frame.Pass()));
1208
1209   // Send window size is based on payload size, so nothing to do if this is
1210   // just a FIN with no payload.
1211   if (flow_control_state_ == FLOW_CONTROL_STREAM_AND_SESSION &&
1212       effective_len != 0) {
1213     DecreaseSendWindowSize(static_cast<int32>(effective_len));
1214     data_buffer->AddConsumeCallback(
1215         base::Bind(&SpdySession::OnWriteBufferConsumed,
1216                    weak_factory_.GetWeakPtr(),
1217                    static_cast<size_t>(effective_len)));
1218   }
1219
1220   return data_buffer.Pass();
1221 }
1222
1223 void SpdySession::CloseActiveStream(SpdyStreamId stream_id, int status) {
1224   DCHECK_NE(stream_id, 0u);
1225
1226   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
1227   if (it == active_streams_.end()) {
1228     NOTREACHED();
1229     return;
1230   }
1231
1232   CloseActiveStreamIterator(it, status);
1233 }
1234
1235 void SpdySession::CloseCreatedStream(
1236     const base::WeakPtr<SpdyStream>& stream, int status) {
1237   DCHECK_EQ(stream->stream_id(), 0u);
1238
1239   CreatedStreamSet::iterator it = created_streams_.find(stream.get());
1240   if (it == created_streams_.end()) {
1241     NOTREACHED();
1242     return;
1243   }
1244
1245   CloseCreatedStreamIterator(it, status);
1246 }
1247
1248 void SpdySession::ResetStream(SpdyStreamId stream_id,
1249                               SpdyRstStreamStatus status,
1250                               const std::string& description) {
1251   DCHECK_NE(stream_id, 0u);
1252
1253   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
1254   if (it == active_streams_.end()) {
1255     NOTREACHED();
1256     return;
1257   }
1258
1259   ResetStreamIterator(it, status, description);
1260 }
1261
1262 bool SpdySession::IsStreamActive(SpdyStreamId stream_id) const {
1263   return ContainsKey(active_streams_, stream_id);
1264 }
1265
1266 LoadState SpdySession::GetLoadState() const {
1267   // Just report that we're idle since the session could be doing
1268   // many things concurrently.
1269   return LOAD_STATE_IDLE;
1270 }
1271
1272 void SpdySession::CloseActiveStreamIterator(ActiveStreamMap::iterator it,
1273                                             int status) {
1274   // TODO(mbelshe): We should send a RST_STREAM control frame here
1275   //                so that the server can cancel a large send.
1276
1277   scoped_ptr<SpdyStream> owned_stream(it->second.stream);
1278   active_streams_.erase(it);
1279
1280   // TODO(akalin): When SpdyStream was ref-counted (and
1281   // |unclaimed_pushed_streams_| held scoped_refptr<SpdyStream>), this
1282   // was only done when status was not OK. This meant that pushed
1283   // streams can still be claimed after they're closed. This is
1284   // probably something that we still want to support, although server
1285   // push is hardly used. Write tests for this and fix this. (See
1286   // http://crbug.com/261712 .)
1287   if (owned_stream->type() == SPDY_PUSH_STREAM) {
1288     unclaimed_pushed_streams_.erase(owned_stream->url());
1289     num_pushed_streams_--;
1290     if (!owned_stream->IsReservedRemote())
1291       num_active_pushed_streams_--;
1292   }
1293
1294   DeleteStream(owned_stream.Pass(), status);
1295   MaybeFinishGoingAway();
1296
1297   // If there are no active streams and the socket pool is stalled, close the
1298   // session to free up a socket slot.
1299   if (active_streams_.empty() && connection_->IsPoolStalled()) {
1300     DoDrainSession(ERR_CONNECTION_CLOSED, "Closing idle connection.");
1301   }
1302 }
1303
1304 void SpdySession::CloseCreatedStreamIterator(CreatedStreamSet::iterator it,
1305                                              int status) {
1306   scoped_ptr<SpdyStream> owned_stream(*it);
1307   created_streams_.erase(it);
1308   DeleteStream(owned_stream.Pass(), status);
1309 }
1310
1311 void SpdySession::ResetStreamIterator(ActiveStreamMap::iterator it,
1312                                       SpdyRstStreamStatus status,
1313                                       const std::string& description) {
1314   // Send the RST_STREAM frame first as CloseActiveStreamIterator()
1315   // may close us.
1316   SpdyStreamId stream_id = it->first;
1317   RequestPriority priority = it->second.stream->priority();
1318   EnqueueResetStreamFrame(stream_id, priority, status, description);
1319
1320   // Removes any pending writes for the stream except for possibly an
1321   // in-flight one.
1322   CloseActiveStreamIterator(it, ERR_SPDY_PROTOCOL_ERROR);
1323 }
1324
1325 void SpdySession::EnqueueResetStreamFrame(SpdyStreamId stream_id,
1326                                           RequestPriority priority,
1327                                           SpdyRstStreamStatus status,
1328                                           const std::string& description) {
1329   DCHECK_NE(stream_id, 0u);
1330
1331   net_log().AddEvent(
1332       NetLog::TYPE_HTTP2_SESSION_SEND_RST_STREAM,
1333       base::Bind(&NetLogSpdyRstCallback, stream_id, status, &description));
1334
1335   DCHECK(buffered_spdy_framer_.get());
1336   scoped_ptr<SpdyFrame> rst_frame(
1337       buffered_spdy_framer_->CreateRstStream(stream_id, status));
1338
1339   EnqueueSessionWrite(priority, RST_STREAM, rst_frame.Pass());
1340   RecordProtocolErrorHistogram(MapRstStreamStatusToProtocolError(status));
1341 }
1342
1343 void SpdySession::PumpReadLoop(ReadState expected_read_state, int result) {
1344   // TODO(pkasting): Remove ScopedTracker below once crbug.com/462774 is fixed.
1345   tracked_objects::ScopedTracker tracking_profile(
1346       FROM_HERE_WITH_EXPLICIT_FUNCTION("462774 SpdySession::PumpReadLoop"));
1347
1348   CHECK(!in_io_loop_);
1349   if (availability_state_ == STATE_DRAINING) {
1350     return;
1351   }
1352   ignore_result(DoReadLoop(expected_read_state, result));
1353 }
1354
1355 int SpdySession::DoReadLoop(ReadState expected_read_state, int result) {
1356   CHECK(!in_io_loop_);
1357   CHECK_EQ(read_state_, expected_read_state);
1358
1359   in_io_loop_ = true;
1360
1361   int bytes_read_without_yielding = 0;
1362
1363   // Loop until the session is draining, the read becomes blocked, or
1364   // the read limit is exceeded.
1365   while (true) {
1366     switch (read_state_) {
1367       case READ_STATE_DO_READ:
1368         CHECK_EQ(result, OK);
1369         result = DoRead();
1370         break;
1371       case READ_STATE_DO_READ_COMPLETE:
1372         if (result > 0)
1373           bytes_read_without_yielding += result;
1374         result = DoReadComplete(result);
1375         break;
1376       default:
1377         NOTREACHED() << "read_state_: " << read_state_;
1378         break;
1379     }
1380
1381     if (availability_state_ == STATE_DRAINING)
1382       break;
1383
1384     if (result == ERR_IO_PENDING)
1385       break;
1386
1387     if (bytes_read_without_yielding > kMaxReadBytesWithoutYielding) {
1388       read_state_ = READ_STATE_DO_READ;
1389       base::MessageLoop::current()->PostTask(
1390           FROM_HERE,
1391           base::Bind(&SpdySession::PumpReadLoop,
1392                      weak_factory_.GetWeakPtr(), READ_STATE_DO_READ, OK));
1393       result = ERR_IO_PENDING;
1394       break;
1395     }
1396   }
1397
1398   CHECK(in_io_loop_);
1399   in_io_loop_ = false;
1400
1401   return result;
1402 }
1403
1404 int SpdySession::DoRead() {
1405   CHECK(in_io_loop_);
1406
1407   CHECK(connection_);
1408   CHECK(connection_->socket());
1409   read_state_ = READ_STATE_DO_READ_COMPLETE;
1410   return connection_->socket()->Read(
1411       read_buffer_.get(),
1412       kReadBufferSize,
1413       base::Bind(&SpdySession::PumpReadLoop,
1414                  weak_factory_.GetWeakPtr(), READ_STATE_DO_READ_COMPLETE));
1415 }
1416
1417 int SpdySession::DoReadComplete(int result) {
1418   CHECK(in_io_loop_);
1419
1420   // Parse a frame.  For now this code requires that the frame fit into our
1421   // buffer (kReadBufferSize).
1422   // TODO(mbelshe): support arbitrarily large frames!
1423
1424   if (result == 0) {
1425     UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySession.BytesRead.EOF",
1426                                 total_bytes_received_, 1, 100000000, 50);
1427     DoDrainSession(ERR_CONNECTION_CLOSED, "Connection closed");
1428
1429     return ERR_CONNECTION_CLOSED;
1430   }
1431
1432   if (result < 0) {
1433     DoDrainSession(static_cast<Error>(result), "result is < 0.");
1434     return result;
1435   }
1436   CHECK_LE(result, kReadBufferSize);
1437   total_bytes_received_ += result;
1438
1439   last_activity_time_ = time_func_();
1440
1441   DCHECK(buffered_spdy_framer_.get());
1442   char* data = read_buffer_->data();
1443   while (result > 0) {
1444     uint32 bytes_processed = buffered_spdy_framer_->ProcessInput(data, result);
1445     result -= bytes_processed;
1446     data += bytes_processed;
1447
1448     if (availability_state_ == STATE_DRAINING) {
1449       return ERR_CONNECTION_CLOSED;
1450     }
1451
1452     DCHECK_EQ(buffered_spdy_framer_->error_code(), SpdyFramer::SPDY_NO_ERROR);
1453   }
1454
1455   read_state_ = READ_STATE_DO_READ;
1456   return OK;
1457 }
1458
1459 void SpdySession::PumpWriteLoop(WriteState expected_write_state, int result) {
1460   CHECK(!in_io_loop_);
1461   DCHECK_EQ(write_state_, expected_write_state);
1462
1463   DoWriteLoop(expected_write_state, result);
1464
1465   if (availability_state_ == STATE_DRAINING && !in_flight_write_ &&
1466       write_queue_.IsEmpty()) {
1467     pool_->RemoveUnavailableSession(GetWeakPtr());  // Destroys |this|.
1468     return;
1469   }
1470 }
1471
1472 int SpdySession::DoWriteLoop(WriteState expected_write_state, int result) {
1473   CHECK(!in_io_loop_);
1474   DCHECK_NE(write_state_, WRITE_STATE_IDLE);
1475   DCHECK_EQ(write_state_, expected_write_state);
1476
1477   in_io_loop_ = true;
1478
1479   // Loop until the session is closed or the write becomes blocked.
1480   while (true) {
1481     switch (write_state_) {
1482       case WRITE_STATE_DO_WRITE:
1483         DCHECK_EQ(result, OK);
1484         result = DoWrite();
1485         break;
1486       case WRITE_STATE_DO_WRITE_COMPLETE:
1487         result = DoWriteComplete(result);
1488         break;
1489       case WRITE_STATE_IDLE:
1490       default:
1491         NOTREACHED() << "write_state_: " << write_state_;
1492         break;
1493     }
1494
1495     if (write_state_ == WRITE_STATE_IDLE) {
1496       DCHECK_EQ(result, ERR_IO_PENDING);
1497       break;
1498     }
1499
1500     if (result == ERR_IO_PENDING)
1501       break;
1502   }
1503
1504   CHECK(in_io_loop_);
1505   in_io_loop_ = false;
1506
1507   return result;
1508 }
1509
1510 int SpdySession::DoWrite() {
1511   CHECK(in_io_loop_);
1512
1513   DCHECK(buffered_spdy_framer_);
1514   if (in_flight_write_) {
1515     DCHECK_GT(in_flight_write_->GetRemainingSize(), 0u);
1516   } else {
1517     // Grab the next frame to send.
1518     SpdyFrameType frame_type = DATA;
1519     scoped_ptr<SpdyBufferProducer> producer;
1520     base::WeakPtr<SpdyStream> stream;
1521     if (!write_queue_.Dequeue(&frame_type, &producer, &stream)) {
1522       write_state_ = WRITE_STATE_IDLE;
1523       return ERR_IO_PENDING;
1524     }
1525
1526     if (stream.get())
1527       CHECK(!stream->IsClosed());
1528
1529     // Activate the stream only when sending the SYN_STREAM frame to
1530     // guarantee monotonically-increasing stream IDs.
1531     if (frame_type == SYN_STREAM) {
1532       CHECK(stream.get());
1533       CHECK_EQ(stream->stream_id(), 0u);
1534       scoped_ptr<SpdyStream> owned_stream =
1535           ActivateCreatedStream(stream.get());
1536       InsertActivatedStream(owned_stream.Pass());
1537
1538       if (stream_hi_water_mark_ > kLastStreamId) {
1539         CHECK_EQ(stream->stream_id(), kLastStreamId);
1540         // We've exhausted the stream ID space, and no new streams may be
1541         // created after this one.
1542         MakeUnavailable();
1543         StartGoingAway(kLastStreamId, ERR_ABORTED);
1544       }
1545     }
1546
1547     // TODO(pkasting): Remove ScopedTracker below once crbug.com/457517 is
1548     // fixed.
1549     tracked_objects::ScopedTracker tracking_profile1(
1550         FROM_HERE_WITH_EXPLICIT_FUNCTION("457517 SpdySession::DoWrite1"));
1551     in_flight_write_ = producer->ProduceBuffer();
1552     if (!in_flight_write_) {
1553       NOTREACHED();
1554       return ERR_UNEXPECTED;
1555     }
1556     in_flight_write_frame_type_ = frame_type;
1557     in_flight_write_frame_size_ = in_flight_write_->GetRemainingSize();
1558     DCHECK_GE(in_flight_write_frame_size_,
1559               buffered_spdy_framer_->GetFrameMinimumSize());
1560     in_flight_write_stream_ = stream;
1561   }
1562
1563   write_state_ = WRITE_STATE_DO_WRITE_COMPLETE;
1564
1565   // Explicitly store in a scoped_refptr<IOBuffer> to avoid problems
1566   // with Socket implementations that don't store their IOBuffer
1567   // argument in a scoped_refptr<IOBuffer> (see crbug.com/232345).
1568   // TODO(pkasting): Remove ScopedTracker below once crbug.com/457517 is fixed.
1569   tracked_objects::ScopedTracker tracking_profile2(
1570       FROM_HERE_WITH_EXPLICIT_FUNCTION("457517 SpdySession::DoWrite2"));
1571   scoped_refptr<IOBuffer> write_io_buffer =
1572       in_flight_write_->GetIOBufferForRemainingData();
1573   return connection_->socket()->Write(
1574       write_io_buffer.get(),
1575       in_flight_write_->GetRemainingSize(),
1576       base::Bind(&SpdySession::PumpWriteLoop,
1577                  weak_factory_.GetWeakPtr(), WRITE_STATE_DO_WRITE_COMPLETE));
1578 }
1579
1580 int SpdySession::DoWriteComplete(int result) {
1581   CHECK(in_io_loop_);
1582   DCHECK_NE(result, ERR_IO_PENDING);
1583   DCHECK_GT(in_flight_write_->GetRemainingSize(), 0u);
1584
1585   last_activity_time_ = time_func_();
1586
1587   if (result < 0) {
1588     DCHECK_NE(result, ERR_IO_PENDING);
1589     in_flight_write_.reset();
1590     in_flight_write_frame_type_ = DATA;
1591     in_flight_write_frame_size_ = 0;
1592     in_flight_write_stream_.reset();
1593     write_state_ = WRITE_STATE_DO_WRITE;
1594     DoDrainSession(static_cast<Error>(result), "Write error");
1595     return OK;
1596   }
1597
1598   // It should not be possible to have written more bytes than our
1599   // in_flight_write_.
1600   DCHECK_LE(static_cast<size_t>(result),
1601             in_flight_write_->GetRemainingSize());
1602
1603   if (result > 0) {
1604     in_flight_write_->Consume(static_cast<size_t>(result));
1605
1606     // We only notify the stream when we've fully written the pending frame.
1607     if (in_flight_write_->GetRemainingSize() == 0) {
1608       // It is possible that the stream was cancelled while we were
1609       // writing to the socket.
1610       if (in_flight_write_stream_.get()) {
1611         DCHECK_GT(in_flight_write_frame_size_, 0u);
1612         in_flight_write_stream_->OnFrameWriteComplete(
1613             in_flight_write_frame_type_,
1614             in_flight_write_frame_size_);
1615       }
1616
1617       // Cleanup the write which just completed.
1618       in_flight_write_.reset();
1619       in_flight_write_frame_type_ = DATA;
1620       in_flight_write_frame_size_ = 0;
1621       in_flight_write_stream_.reset();
1622     }
1623   }
1624
1625   write_state_ = WRITE_STATE_DO_WRITE;
1626   return OK;
1627 }
1628
1629 void SpdySession::DcheckGoingAway() const {
1630 #if DCHECK_IS_ON()
1631   DCHECK_GE(availability_state_, STATE_GOING_AWAY);
1632   for (int i = MINIMUM_PRIORITY; i <= MAXIMUM_PRIORITY; ++i) {
1633     DCHECK(pending_create_stream_queues_[i].empty());
1634   }
1635   DCHECK(created_streams_.empty());
1636 #endif
1637 }
1638
1639 void SpdySession::DcheckDraining() const {
1640   DcheckGoingAway();
1641   DCHECK_EQ(availability_state_, STATE_DRAINING);
1642   DCHECK(active_streams_.empty());
1643   DCHECK(unclaimed_pushed_streams_.empty());
1644 }
1645
1646 void SpdySession::StartGoingAway(SpdyStreamId last_good_stream_id,
1647                                  Error status) {
1648   DCHECK_GE(availability_state_, STATE_GOING_AWAY);
1649
1650   // The loops below are carefully written to avoid reentrancy problems.
1651
1652   while (true) {
1653     size_t old_size = GetTotalSize(pending_create_stream_queues_);
1654     base::WeakPtr<SpdyStreamRequest> pending_request =
1655         GetNextPendingStreamRequest();
1656     if (!pending_request)
1657       break;
1658     // No new stream requests should be added while the session is
1659     // going away.
1660     DCHECK_GT(old_size, GetTotalSize(pending_create_stream_queues_));
1661     pending_request->OnRequestCompleteFailure(ERR_ABORTED);
1662   }
1663
1664   while (true) {
1665     size_t old_size = active_streams_.size();
1666     ActiveStreamMap::iterator it =
1667         active_streams_.lower_bound(last_good_stream_id + 1);
1668     if (it == active_streams_.end())
1669       break;
1670     LogAbandonedActiveStream(it, status);
1671     CloseActiveStreamIterator(it, status);
1672     // No new streams should be activated while the session is going
1673     // away.
1674     DCHECK_GT(old_size, active_streams_.size());
1675   }
1676
1677   while (!created_streams_.empty()) {
1678     size_t old_size = created_streams_.size();
1679     CreatedStreamSet::iterator it = created_streams_.begin();
1680     LogAbandonedStream(*it, status);
1681     CloseCreatedStreamIterator(it, status);
1682     // No new streams should be created while the session is going
1683     // away.
1684     DCHECK_GT(old_size, created_streams_.size());
1685   }
1686
1687   write_queue_.RemovePendingWritesForStreamsAfter(last_good_stream_id);
1688
1689   DcheckGoingAway();
1690 }
1691
1692 void SpdySession::MaybeFinishGoingAway() {
1693   if (active_streams_.empty() && availability_state_ == STATE_GOING_AWAY) {
1694     DoDrainSession(OK, "Finished going away");
1695   }
1696 }
1697
1698 void SpdySession::DoDrainSession(Error err, const std::string& description) {
1699   if (availability_state_ == STATE_DRAINING) {
1700     return;
1701   }
1702   MakeUnavailable();
1703
1704   // Mark host_port_pair requiring HTTP/1.1 for subsequent connections.
1705   if (err == ERR_HTTP_1_1_REQUIRED) {
1706     http_server_properties_->SetHTTP11Required(host_port_pair());
1707   }
1708
1709   // If |err| indicates an error occurred, inform the peer that we're closing
1710   // and why. Don't GOAWAY on a graceful or idle close, as that may
1711   // unnecessarily wake the radio. We could technically GOAWAY on network errors
1712   // (we'll probably fail to actually write it, but that's okay), however many
1713   // unit-tests would need to be updated.
1714   if (err != OK &&
1715       err != ERR_ABORTED &&  // Used by SpdySessionPool to close idle sessions.
1716       err != ERR_NETWORK_CHANGED &&  // Used to deprecate sessions on IP change.
1717       err != ERR_SOCKET_NOT_CONNECTED && err != ERR_HTTP_1_1_REQUIRED &&
1718       err != ERR_CONNECTION_CLOSED && err != ERR_CONNECTION_RESET) {
1719     // Enqueue a GOAWAY to inform the peer of why we're closing the connection.
1720     SpdyGoAwayIR goaway_ir(last_accepted_push_stream_id_,
1721                            MapNetErrorToGoAwayStatus(err),
1722                            description);
1723     EnqueueSessionWrite(HIGHEST,
1724                         GOAWAY,
1725                         scoped_ptr<SpdyFrame>(
1726                             buffered_spdy_framer_->SerializeFrame(goaway_ir)));
1727   }
1728
1729   availability_state_ = STATE_DRAINING;
1730   error_on_close_ = err;
1731
1732   net_log_.AddEvent(
1733       NetLog::TYPE_HTTP2_SESSION_CLOSE,
1734       base::Bind(&NetLogSpdySessionCloseCallback, err, &description));
1735
1736   UMA_HISTOGRAM_SPARSE_SLOWLY("Net.SpdySession.ClosedOnError", -err);
1737   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySession.BytesRead.OtherErrors",
1738                               total_bytes_received_, 1, 100000000, 50);
1739
1740   if (err == OK) {
1741     // We ought to be going away already, as this is a graceful close.
1742     DcheckGoingAway();
1743   } else {
1744     StartGoingAway(0, err);
1745   }
1746   DcheckDraining();
1747   MaybePostWriteLoop();
1748 }
1749
1750 void SpdySession::LogAbandonedStream(SpdyStream* stream, Error status) {
1751   DCHECK(stream);
1752   std::string description = base::StringPrintf(
1753       "ABANDONED (stream_id=%d): ", stream->stream_id()) +
1754       stream->url().spec();
1755   stream->LogStreamError(status, description);
1756   // We don't increment the streams abandoned counter here. If the
1757   // stream isn't active (i.e., it hasn't written anything to the wire
1758   // yet) then it's as if it never existed. If it is active, then
1759   // LogAbandonedActiveStream() will increment the counters.
1760 }
1761
1762 void SpdySession::LogAbandonedActiveStream(ActiveStreamMap::const_iterator it,
1763                                            Error status) {
1764   DCHECK_GT(it->first, 0u);
1765   LogAbandonedStream(it->second.stream, status);
1766   ++streams_abandoned_count_;
1767   if (it->second.stream->type() == SPDY_PUSH_STREAM &&
1768       unclaimed_pushed_streams_.find(it->second.stream->url()) !=
1769       unclaimed_pushed_streams_.end()) {
1770   }
1771 }
1772
1773 SpdyStreamId SpdySession::GetNewStreamId() {
1774   CHECK_LE(stream_hi_water_mark_, kLastStreamId);
1775   SpdyStreamId id = stream_hi_water_mark_;
1776   stream_hi_water_mark_ += 2;
1777   return id;
1778 }
1779
1780 void SpdySession::CloseSessionOnError(Error err,
1781                                       const std::string& description) {
1782   DCHECK_LT(err, ERR_IO_PENDING);
1783   DoDrainSession(err, description);
1784 }
1785
1786 void SpdySession::MakeUnavailable() {
1787   if (availability_state_ == STATE_AVAILABLE) {
1788     availability_state_ = STATE_GOING_AWAY;
1789     pool_->MakeSessionUnavailable(GetWeakPtr());
1790   }
1791 }
1792
1793 base::Value* SpdySession::GetInfoAsValue() const {
1794   base::DictionaryValue* dict = new base::DictionaryValue();
1795
1796   dict->SetInteger("source_id", net_log_.source().id);
1797
1798   dict->SetString("host_port_pair", host_port_pair().ToString());
1799   if (!pooled_aliases_.empty()) {
1800     base::ListValue* alias_list = new base::ListValue();
1801     for (std::set<SpdySessionKey>::const_iterator it =
1802              pooled_aliases_.begin();
1803          it != pooled_aliases_.end(); it++) {
1804       alias_list->Append(new base::StringValue(
1805           it->host_port_pair().ToString()));
1806     }
1807     dict->Set("aliases", alias_list);
1808   }
1809   dict->SetString("proxy", host_port_proxy_pair().second.ToURI());
1810
1811   dict->SetInteger("active_streams", active_streams_.size());
1812
1813   dict->SetInteger("unclaimed_pushed_streams",
1814                    unclaimed_pushed_streams_.size());
1815
1816   dict->SetBoolean("is_secure", is_secure_);
1817
1818   dict->SetString("protocol_negotiated",
1819                   SSLClientSocket::NextProtoToString(
1820                       connection_->socket()->GetNegotiatedProtocol()));
1821
1822   dict->SetInteger("error", error_on_close_);
1823   dict->SetInteger("max_concurrent_streams", max_concurrent_streams_);
1824
1825   dict->SetInteger("streams_initiated_count", streams_initiated_count_);
1826   dict->SetInteger("streams_pushed_count", streams_pushed_count_);
1827   dict->SetInteger("streams_pushed_and_claimed_count",
1828       streams_pushed_and_claimed_count_);
1829   dict->SetInteger("streams_abandoned_count", streams_abandoned_count_);
1830   DCHECK(buffered_spdy_framer_.get());
1831   dict->SetInteger("frames_received", buffered_spdy_framer_->frames_received());
1832
1833   dict->SetBoolean("sent_settings", sent_settings_);
1834   dict->SetBoolean("received_settings", received_settings_);
1835
1836   dict->SetInteger("send_window_size", session_send_window_size_);
1837   dict->SetInteger("recv_window_size", session_recv_window_size_);
1838   dict->SetInteger("unacked_recv_window_bytes",
1839                    session_unacked_recv_window_bytes_);
1840   return dict;
1841 }
1842
1843 bool SpdySession::IsReused() const {
1844   return buffered_spdy_framer_->frames_received() > 0 ||
1845       connection_->reuse_type() == ClientSocketHandle::UNUSED_IDLE;
1846 }
1847
1848 bool SpdySession::GetLoadTimingInfo(SpdyStreamId stream_id,
1849                                     LoadTimingInfo* load_timing_info) const {
1850   return connection_->GetLoadTimingInfo(stream_id != kFirstStreamId,
1851                                         load_timing_info);
1852 }
1853
1854 int SpdySession::GetPeerAddress(IPEndPoint* address) const {
1855   int rv = ERR_SOCKET_NOT_CONNECTED;
1856   if (connection_->socket()) {
1857     rv = connection_->socket()->GetPeerAddress(address);
1858   }
1859
1860   UMA_HISTOGRAM_BOOLEAN("Net.SpdySessionSocketNotConnectedGetPeerAddress",
1861                         rv == ERR_SOCKET_NOT_CONNECTED);
1862
1863   return rv;
1864 }
1865
1866 int SpdySession::GetLocalAddress(IPEndPoint* address) const {
1867   int rv = ERR_SOCKET_NOT_CONNECTED;
1868   if (connection_->socket()) {
1869     rv = connection_->socket()->GetLocalAddress(address);
1870   }
1871
1872   UMA_HISTOGRAM_BOOLEAN("Net.SpdySessionSocketNotConnectedGetLocalAddress",
1873                         rv == ERR_SOCKET_NOT_CONNECTED);
1874
1875   return rv;
1876 }
1877
1878 void SpdySession::EnqueueSessionWrite(RequestPriority priority,
1879                                       SpdyFrameType frame_type,
1880                                       scoped_ptr<SpdyFrame> frame) {
1881   DCHECK(frame_type == RST_STREAM || frame_type == SETTINGS ||
1882          frame_type == WINDOW_UPDATE || frame_type == PING ||
1883          frame_type == GOAWAY);
1884   EnqueueWrite(
1885       priority, frame_type,
1886       scoped_ptr<SpdyBufferProducer>(
1887           new SimpleBufferProducer(
1888               scoped_ptr<SpdyBuffer>(new SpdyBuffer(frame.Pass())))),
1889       base::WeakPtr<SpdyStream>());
1890 }
1891
1892 void SpdySession::EnqueueWrite(RequestPriority priority,
1893                                SpdyFrameType frame_type,
1894                                scoped_ptr<SpdyBufferProducer> producer,
1895                                const base::WeakPtr<SpdyStream>& stream) {
1896   if (availability_state_ == STATE_DRAINING)
1897     return;
1898
1899   write_queue_.Enqueue(priority, frame_type, producer.Pass(), stream);
1900   MaybePostWriteLoop();
1901 }
1902
1903 void SpdySession::MaybePostWriteLoop() {
1904   if (write_state_ == WRITE_STATE_IDLE) {
1905     CHECK(!in_flight_write_);
1906     write_state_ = WRITE_STATE_DO_WRITE;
1907     base::MessageLoop::current()->PostTask(
1908         FROM_HERE,
1909         base::Bind(&SpdySession::PumpWriteLoop,
1910                    weak_factory_.GetWeakPtr(), WRITE_STATE_DO_WRITE, OK));
1911   }
1912 }
1913
1914 void SpdySession::InsertCreatedStream(scoped_ptr<SpdyStream> stream) {
1915   CHECK_EQ(stream->stream_id(), 0u);
1916   CHECK(created_streams_.find(stream.get()) == created_streams_.end());
1917   created_streams_.insert(stream.release());
1918 }
1919
1920 scoped_ptr<SpdyStream> SpdySession::ActivateCreatedStream(SpdyStream* stream) {
1921   CHECK_EQ(stream->stream_id(), 0u);
1922   CHECK(created_streams_.find(stream) != created_streams_.end());
1923   stream->set_stream_id(GetNewStreamId());
1924   scoped_ptr<SpdyStream> owned_stream(stream);
1925   created_streams_.erase(stream);
1926   return owned_stream.Pass();
1927 }
1928
1929 void SpdySession::InsertActivatedStream(scoped_ptr<SpdyStream> stream) {
1930   SpdyStreamId stream_id = stream->stream_id();
1931   CHECK_NE(stream_id, 0u);
1932   std::pair<ActiveStreamMap::iterator, bool> result =
1933       active_streams_.insert(
1934           std::make_pair(stream_id, ActiveStreamInfo(stream.get())));
1935   CHECK(result.second);
1936   ignore_result(stream.release());
1937 }
1938
1939 void SpdySession::DeleteStream(scoped_ptr<SpdyStream> stream, int status) {
1940   if (in_flight_write_stream_.get() == stream.get()) {
1941     // If we're deleting the stream for the in-flight write, we still
1942     // need to let the write complete, so we clear
1943     // |in_flight_write_stream_| and let the write finish on its own
1944     // without notifying |in_flight_write_stream_|.
1945     in_flight_write_stream_.reset();
1946   }
1947
1948   write_queue_.RemovePendingWritesForStream(stream->GetWeakPtr());
1949   stream->OnClose(status);
1950
1951   if (availability_state_ == STATE_AVAILABLE) {
1952     ProcessPendingStreamRequests();
1953   }
1954 }
1955
1956 base::WeakPtr<SpdyStream> SpdySession::GetActivePushStream(const GURL& url) {
1957   PushedStreamMap::iterator unclaimed_it = unclaimed_pushed_streams_.find(url);
1958   if (unclaimed_it == unclaimed_pushed_streams_.end())
1959     return base::WeakPtr<SpdyStream>();
1960
1961   SpdyStreamId stream_id = unclaimed_it->second.stream_id;
1962   unclaimed_pushed_streams_.erase(unclaimed_it);
1963
1964   ActiveStreamMap::iterator active_it = active_streams_.find(stream_id);
1965   if (active_it == active_streams_.end()) {
1966     NOTREACHED();
1967     return base::WeakPtr<SpdyStream>();
1968   }
1969
1970   net_log_.AddEvent(NetLog::TYPE_HTTP2_STREAM_ADOPTED_PUSH_STREAM,
1971                     base::Bind(&NetLogSpdyAdoptedPushStreamCallback,
1972                                active_it->second.stream->stream_id(), &url));
1973   return active_it->second.stream->GetWeakPtr();
1974 }
1975
1976 bool SpdySession::GetSSLInfo(SSLInfo* ssl_info,
1977                              bool* was_npn_negotiated,
1978                              NextProto* protocol_negotiated) {
1979   *was_npn_negotiated = connection_->socket()->WasNpnNegotiated();
1980   *protocol_negotiated = connection_->socket()->GetNegotiatedProtocol();
1981   return connection_->socket()->GetSSLInfo(ssl_info);
1982 }
1983
1984 bool SpdySession::GetSSLCertRequestInfo(
1985     SSLCertRequestInfo* cert_request_info) {
1986   if (!is_secure_)
1987     return false;
1988   GetSSLClientSocket()->GetSSLCertRequestInfo(cert_request_info);
1989   return true;
1990 }
1991
1992 void SpdySession::OnError(SpdyFramer::SpdyError error_code) {
1993   CHECK(in_io_loop_);
1994
1995   RecordProtocolErrorHistogram(MapFramerErrorToProtocolError(error_code));
1996   std::string description =
1997       base::StringPrintf("Framer error: %d (%s).",
1998                          error_code,
1999                          SpdyFramer::ErrorCodeToString(error_code));
2000   DoDrainSession(MapFramerErrorToNetError(error_code), description);
2001 }
2002
2003 void SpdySession::OnStreamError(SpdyStreamId stream_id,
2004                                 const std::string& description) {
2005   CHECK(in_io_loop_);
2006
2007   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2008   if (it == active_streams_.end()) {
2009     // We still want to send a frame to reset the stream even if we
2010     // don't know anything about it.
2011     EnqueueResetStreamFrame(
2012         stream_id, IDLE, RST_STREAM_PROTOCOL_ERROR, description);
2013     return;
2014   }
2015
2016   ResetStreamIterator(it, RST_STREAM_PROTOCOL_ERROR, description);
2017 }
2018
2019 void SpdySession::OnDataFrameHeader(SpdyStreamId stream_id,
2020                                     size_t length,
2021                                     bool fin) {
2022   CHECK(in_io_loop_);
2023
2024   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2025
2026   // By the time data comes in, the stream may already be inactive.
2027   if (it == active_streams_.end())
2028     return;
2029
2030   SpdyStream* stream = it->second.stream;
2031   CHECK_EQ(stream->stream_id(), stream_id);
2032
2033   DCHECK(buffered_spdy_framer_);
2034   size_t header_len = buffered_spdy_framer_->GetDataFrameMinimumSize();
2035   stream->IncrementRawReceivedBytes(header_len);
2036 }
2037
2038 void SpdySession::OnStreamFrameData(SpdyStreamId stream_id,
2039                                     const char* data,
2040                                     size_t len,
2041                                     bool fin) {
2042   CHECK(in_io_loop_);
2043   DCHECK_LT(len, 1u << 24);
2044   if (net_log().IsLogging()) {
2045     net_log().AddEvent(
2046         NetLog::TYPE_HTTP2_SESSION_RECV_DATA,
2047         base::Bind(&NetLogSpdyDataCallback, stream_id, len, fin));
2048   }
2049
2050   // Build the buffer as early as possible so that we go through the
2051   // session flow control checks and update
2052   // |unacked_recv_window_bytes_| properly even when the stream is
2053   // inactive (since the other side has still reduced its session send
2054   // window).
2055   scoped_ptr<SpdyBuffer> buffer;
2056   if (data) {
2057     DCHECK_GT(len, 0u);
2058     CHECK_LE(len, static_cast<size_t>(kReadBufferSize));
2059     buffer.reset(new SpdyBuffer(data, len));
2060
2061     if (flow_control_state_ == FLOW_CONTROL_STREAM_AND_SESSION) {
2062       DecreaseRecvWindowSize(static_cast<int32>(len));
2063       buffer->AddConsumeCallback(
2064           base::Bind(&SpdySession::OnReadBufferConsumed,
2065                      weak_factory_.GetWeakPtr()));
2066     }
2067   } else {
2068     DCHECK_EQ(len, 0u);
2069   }
2070
2071   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2072
2073   // By the time data comes in, the stream may already be inactive.
2074   if (it == active_streams_.end())
2075     return;
2076
2077   SpdyStream* stream = it->second.stream;
2078   CHECK_EQ(stream->stream_id(), stream_id);
2079
2080   stream->IncrementRawReceivedBytes(len);
2081
2082   if (it->second.waiting_for_syn_reply) {
2083     const std::string& error = "Data received before SYN_REPLY.";
2084     stream->LogStreamError(ERR_SPDY_PROTOCOL_ERROR, error);
2085     ResetStreamIterator(it, RST_STREAM_PROTOCOL_ERROR, error);
2086     return;
2087   }
2088
2089   stream->OnDataReceived(buffer.Pass());
2090 }
2091
2092 void SpdySession::OnStreamPadding(SpdyStreamId stream_id, size_t len) {
2093   CHECK(in_io_loop_);
2094
2095   if (flow_control_state_ != FLOW_CONTROL_STREAM_AND_SESSION)
2096     return;
2097
2098   // Decrease window size because padding bytes are received.
2099   // Increase window size because padding bytes are consumed (by discarding).
2100   // Net result: |session_unacked_recv_window_bytes_| increases by |len|,
2101   // |session_recv_window_size_| does not change.
2102   DecreaseRecvWindowSize(static_cast<int32>(len));
2103   IncreaseRecvWindowSize(static_cast<int32>(len));
2104
2105   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2106   if (it == active_streams_.end())
2107     return;
2108   it->second.stream->OnPaddingConsumed(len);
2109 }
2110
2111 void SpdySession::OnSettings(bool clear_persisted) {
2112   CHECK(in_io_loop_);
2113
2114   if (clear_persisted)
2115     http_server_properties_->ClearSpdySettings(host_port_pair());
2116
2117   if (net_log_.IsLogging()) {
2118     net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_RECV_SETTINGS,
2119                       base::Bind(&NetLogSpdySettingsCallback, host_port_pair(),
2120                                  clear_persisted));
2121   }
2122
2123   if (GetProtocolVersion() >= SPDY4) {
2124     // Send an acknowledgment of the setting.
2125     SpdySettingsIR settings_ir;
2126     settings_ir.set_is_ack(true);
2127     EnqueueSessionWrite(
2128         HIGHEST,
2129         SETTINGS,
2130         scoped_ptr<SpdyFrame>(
2131             buffered_spdy_framer_->SerializeFrame(settings_ir)));
2132   }
2133 }
2134
2135 void SpdySession::OnSetting(SpdySettingsIds id,
2136                             uint8 flags,
2137                             uint32 value) {
2138   CHECK(in_io_loop_);
2139
2140   HandleSetting(id, value);
2141   http_server_properties_->SetSpdySetting(
2142       host_port_pair(),
2143       id,
2144       static_cast<SpdySettingsFlags>(flags),
2145       value);
2146   received_settings_ = true;
2147
2148   // Log the setting.
2149   const SpdyMajorVersion protocol_version = GetProtocolVersion();
2150   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_RECV_SETTING,
2151                     base::Bind(&NetLogSpdySettingCallback, id, protocol_version,
2152                                static_cast<SpdySettingsFlags>(flags), value));
2153 }
2154
2155 void SpdySession::OnSendCompressedFrame(
2156     SpdyStreamId stream_id,
2157     SpdyFrameType type,
2158     size_t payload_len,
2159     size_t frame_len) {
2160   if (type != SYN_STREAM && type != HEADERS)
2161     return;
2162
2163   DCHECK(buffered_spdy_framer_.get());
2164   size_t compressed_len =
2165       frame_len - buffered_spdy_framer_->GetSynStreamMinimumSize();
2166
2167   if (payload_len) {
2168     // Make sure we avoid early decimal truncation.
2169     int compression_pct = 100 - (100 * compressed_len) / payload_len;
2170     UMA_HISTOGRAM_PERCENTAGE("Net.SpdySynStreamCompressionPercentage",
2171                              compression_pct);
2172   }
2173 }
2174
2175 void SpdySession::OnReceiveCompressedFrame(
2176     SpdyStreamId stream_id,
2177     SpdyFrameType type,
2178     size_t frame_len) {
2179   last_compressed_frame_len_ = frame_len;
2180 }
2181
2182 int SpdySession::OnInitialResponseHeadersReceived(
2183     const SpdyHeaderBlock& response_headers,
2184     base::Time response_time,
2185     base::TimeTicks recv_first_byte_time,
2186     SpdyStream* stream) {
2187   CHECK(in_io_loop_);
2188   SpdyStreamId stream_id = stream->stream_id();
2189
2190   if (stream->type() == SPDY_PUSH_STREAM) {
2191     DCHECK(stream->IsReservedRemote());
2192     if (max_concurrent_pushed_streams_ &&
2193         num_active_pushed_streams_ >= max_concurrent_pushed_streams_) {
2194       ResetStream(stream_id,
2195                   RST_STREAM_REFUSED_STREAM,
2196                   "Stream concurrency limit reached.");
2197       return STATUS_CODE_REFUSED_STREAM;
2198     }
2199   }
2200
2201   if (stream->type() == SPDY_PUSH_STREAM) {
2202     // Will be balanced in DeleteStream.
2203     num_active_pushed_streams_++;
2204   }
2205
2206   // May invalidate |stream|.
2207   int rv = stream->OnInitialResponseHeadersReceived(
2208       response_headers, response_time, recv_first_byte_time);
2209   if (rv < 0) {
2210     DCHECK_NE(rv, ERR_IO_PENDING);
2211     DCHECK(active_streams_.find(stream_id) == active_streams_.end());
2212   }
2213
2214   return rv;
2215 }
2216
2217 void SpdySession::OnSynStream(SpdyStreamId stream_id,
2218                               SpdyStreamId associated_stream_id,
2219                               SpdyPriority priority,
2220                               bool fin,
2221                               bool unidirectional,
2222                               const SpdyHeaderBlock& headers) {
2223   CHECK(in_io_loop_);
2224
2225   DCHECK_LE(GetProtocolVersion(), SPDY3);
2226
2227   base::Time response_time = base::Time::Now();
2228   base::TimeTicks recv_first_byte_time = time_func_();
2229
2230   if (net_log_.IsLogging()) {
2231     net_log_.AddEvent(
2232         NetLog::TYPE_HTTP2_SESSION_PUSHED_SYN_STREAM,
2233         base::Bind(&NetLogSpdySynStreamReceivedCallback, &headers, fin,
2234                    unidirectional, priority, stream_id, associated_stream_id));
2235   }
2236
2237   // Split headers to simulate push promise and response.
2238   SpdyHeaderBlock request_headers;
2239   SpdyHeaderBlock response_headers;
2240   SplitPushedHeadersToRequestAndResponse(
2241       headers, GetProtocolVersion(), &request_headers, &response_headers);
2242
2243   if (!TryCreatePushStream(
2244           stream_id, associated_stream_id, priority, request_headers))
2245     return;
2246
2247   ActiveStreamMap::iterator active_it = active_streams_.find(stream_id);
2248   if (active_it == active_streams_.end()) {
2249     NOTREACHED();
2250     return;
2251   }
2252
2253   OnInitialResponseHeadersReceived(response_headers, response_time,
2254                                    recv_first_byte_time,
2255                                    active_it->second.stream);
2256 }
2257
2258 void SpdySession::DeleteExpiredPushedStreams() {
2259   if (unclaimed_pushed_streams_.empty())
2260     return;
2261
2262   // Check that adequate time has elapsed since the last sweep.
2263   if (time_func_() < next_unclaimed_push_stream_sweep_time_)
2264     return;
2265
2266   // Gather old streams to delete.
2267   base::TimeTicks minimum_freshness = time_func_() -
2268       base::TimeDelta::FromSeconds(kMinPushedStreamLifetimeSeconds);
2269   std::vector<SpdyStreamId> streams_to_close;
2270   for (PushedStreamMap::iterator it = unclaimed_pushed_streams_.begin();
2271        it != unclaimed_pushed_streams_.end(); ++it) {
2272     if (minimum_freshness > it->second.creation_time)
2273       streams_to_close.push_back(it->second.stream_id);
2274   }
2275
2276   for (std::vector<SpdyStreamId>::const_iterator to_close_it =
2277            streams_to_close.begin();
2278        to_close_it != streams_to_close.end(); ++to_close_it) {
2279     ActiveStreamMap::iterator active_it = active_streams_.find(*to_close_it);
2280     if (active_it == active_streams_.end())
2281       continue;
2282
2283     LogAbandonedActiveStream(active_it, ERR_INVALID_SPDY_STREAM);
2284     // CloseActiveStreamIterator() will remove the stream from
2285     // |unclaimed_pushed_streams_|.
2286     ResetStreamIterator(
2287         active_it, RST_STREAM_REFUSED_STREAM, "Stream not claimed.");
2288   }
2289
2290   next_unclaimed_push_stream_sweep_time_ = time_func_() +
2291       base::TimeDelta::FromSeconds(kMinPushedStreamLifetimeSeconds);
2292 }
2293
2294 void SpdySession::OnSynReply(SpdyStreamId stream_id,
2295                              bool fin,
2296                              const SpdyHeaderBlock& headers) {
2297   CHECK(in_io_loop_);
2298
2299   base::Time response_time = base::Time::Now();
2300   base::TimeTicks recv_first_byte_time = time_func_();
2301
2302   if (net_log().IsLogging()) {
2303     net_log().AddEvent(NetLog::TYPE_HTTP2_SESSION_SYN_REPLY,
2304                        base::Bind(&NetLogSpdySynReplyOrHeadersReceivedCallback,
2305                                   &headers, fin, stream_id));
2306   }
2307
2308   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2309   if (it == active_streams_.end()) {
2310     // NOTE:  it may just be that the stream was cancelled.
2311     return;
2312   }
2313
2314   SpdyStream* stream = it->second.stream;
2315   CHECK_EQ(stream->stream_id(), stream_id);
2316
2317   stream->IncrementRawReceivedBytes(last_compressed_frame_len_);
2318   last_compressed_frame_len_ = 0;
2319
2320   if (GetProtocolVersion() >= SPDY4) {
2321     const std::string& error =
2322         "SPDY4 wasn't expecting SYN_REPLY.";
2323     stream->LogStreamError(ERR_SPDY_PROTOCOL_ERROR, error);
2324     ResetStreamIterator(it, RST_STREAM_PROTOCOL_ERROR, error);
2325     return;
2326   }
2327   if (!it->second.waiting_for_syn_reply) {
2328     const std::string& error =
2329         "Received duplicate SYN_REPLY for stream.";
2330     stream->LogStreamError(ERR_SPDY_PROTOCOL_ERROR, error);
2331     ResetStreamIterator(it, RST_STREAM_PROTOCOL_ERROR, error);
2332     return;
2333   }
2334   it->second.waiting_for_syn_reply = false;
2335
2336   ignore_result(OnInitialResponseHeadersReceived(
2337       headers, response_time, recv_first_byte_time, stream));
2338 }
2339
2340 void SpdySession::OnHeaders(SpdyStreamId stream_id,
2341                             bool has_priority,
2342                             SpdyPriority priority,
2343                             bool fin,
2344                             const SpdyHeaderBlock& headers) {
2345   CHECK(in_io_loop_);
2346
2347   if (net_log().IsLogging()) {
2348     net_log().AddEvent(NetLog::TYPE_HTTP2_SESSION_RECV_HEADERS,
2349                        base::Bind(&NetLogSpdySynReplyOrHeadersReceivedCallback,
2350                                   &headers, fin, stream_id));
2351   }
2352
2353   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2354   if (it == active_streams_.end()) {
2355     // NOTE:  it may just be that the stream was cancelled.
2356     LOG(WARNING) << "Received HEADERS for invalid stream " << stream_id;
2357     return;
2358   }
2359
2360   SpdyStream* stream = it->second.stream;
2361   CHECK_EQ(stream->stream_id(), stream_id);
2362
2363   stream->IncrementRawReceivedBytes(last_compressed_frame_len_);
2364   last_compressed_frame_len_ = 0;
2365
2366   base::Time response_time = base::Time::Now();
2367   base::TimeTicks recv_first_byte_time = time_func_();
2368
2369   if (it->second.waiting_for_syn_reply) {
2370     if (GetProtocolVersion() < SPDY4) {
2371       const std::string& error =
2372           "Was expecting SYN_REPLY, not HEADERS.";
2373       stream->LogStreamError(ERR_SPDY_PROTOCOL_ERROR, error);
2374       ResetStreamIterator(it, RST_STREAM_PROTOCOL_ERROR, error);
2375       return;
2376     }
2377
2378     it->second.waiting_for_syn_reply = false;
2379     ignore_result(OnInitialResponseHeadersReceived(
2380         headers, response_time, recv_first_byte_time, stream));
2381   } else if (it->second.stream->IsReservedRemote()) {
2382     ignore_result(OnInitialResponseHeadersReceived(
2383         headers, response_time, recv_first_byte_time, stream));
2384   } else {
2385     int rv = stream->OnAdditionalResponseHeadersReceived(headers);
2386     if (rv < 0) {
2387       DCHECK_NE(rv, ERR_IO_PENDING);
2388       DCHECK(active_streams_.find(stream_id) == active_streams_.end());
2389     }
2390   }
2391 }
2392
2393 bool SpdySession::OnUnknownFrame(SpdyStreamId stream_id, int frame_type) {
2394   // Validate stream id.
2395   // Was the frame sent on a stream id that has not been used in this session?
2396   if (stream_id % 2 == 1 && stream_id > stream_hi_water_mark_)
2397     return false;
2398
2399   if (stream_id % 2 == 0 && stream_id > last_accepted_push_stream_id_)
2400     return false;
2401
2402   return true;
2403 }
2404
2405 void SpdySession::OnRstStream(SpdyStreamId stream_id,
2406                               SpdyRstStreamStatus status) {
2407   CHECK(in_io_loop_);
2408
2409   std::string description;
2410   net_log().AddEvent(
2411       NetLog::TYPE_HTTP2_SESSION_RST_STREAM,
2412       base::Bind(&NetLogSpdyRstCallback, stream_id, status, &description));
2413
2414   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2415   if (it == active_streams_.end()) {
2416     // NOTE:  it may just be that the stream was cancelled.
2417     LOG(WARNING) << "Received RST for invalid stream" << stream_id;
2418     return;
2419   }
2420
2421   CHECK_EQ(it->second.stream->stream_id(), stream_id);
2422
2423   if (status == 0) {
2424     it->second.stream->OnDataReceived(scoped_ptr<SpdyBuffer>());
2425   } else if (status == RST_STREAM_REFUSED_STREAM) {
2426     CloseActiveStreamIterator(it, ERR_SPDY_SERVER_REFUSED_STREAM);
2427   } else if (status == RST_STREAM_HTTP_1_1_REQUIRED) {
2428     // TODO(bnc): Record histogram with number of open streams capped at 50.
2429     it->second.stream->LogStreamError(
2430         ERR_HTTP_1_1_REQUIRED,
2431         base::StringPrintf(
2432             "SPDY session closed because of stream with status: %d", status));
2433     DoDrainSession(ERR_HTTP_1_1_REQUIRED, "HTTP_1_1_REQUIRED for stream.");
2434   } else {
2435     RecordProtocolErrorHistogram(
2436         PROTOCOL_ERROR_RST_STREAM_FOR_NON_ACTIVE_STREAM);
2437     it->second.stream->LogStreamError(
2438         ERR_SPDY_PROTOCOL_ERROR,
2439         base::StringPrintf("SPDY stream closed with status: %d", status));
2440     // TODO(mbelshe): Map from Spdy-protocol errors to something sensical.
2441     //                For now, it doesn't matter much - it is a protocol error.
2442     CloseActiveStreamIterator(it, ERR_SPDY_PROTOCOL_ERROR);
2443   }
2444 }
2445
2446 void SpdySession::OnGoAway(SpdyStreamId last_accepted_stream_id,
2447                            SpdyGoAwayStatus status) {
2448   CHECK(in_io_loop_);
2449
2450   // TODO(jgraettinger): UMA histogram on |status|.
2451
2452   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_GOAWAY,
2453                     base::Bind(&NetLogSpdyGoAwayCallback,
2454                                last_accepted_stream_id, active_streams_.size(),
2455                                unclaimed_pushed_streams_.size(), status));
2456   MakeUnavailable();
2457   if (status == GOAWAY_HTTP_1_1_REQUIRED) {
2458     // TODO(bnc): Record histogram with number of open streams capped at 50.
2459     DoDrainSession(ERR_HTTP_1_1_REQUIRED, "HTTP_1_1_REQUIRED for stream.");
2460   } else {
2461     StartGoingAway(last_accepted_stream_id, ERR_ABORTED);
2462   }
2463   // This is to handle the case when we already don't have any active
2464   // streams (i.e., StartGoingAway() did nothing). Otherwise, we have
2465   // active streams and so the last one being closed will finish the
2466   // going away process (see DeleteStream()).
2467   MaybeFinishGoingAway();
2468 }
2469
2470 void SpdySession::OnPing(SpdyPingId unique_id, bool is_ack) {
2471   CHECK(in_io_loop_);
2472
2473   net_log_.AddEvent(
2474       NetLog::TYPE_HTTP2_SESSION_PING,
2475       base::Bind(&NetLogSpdyPingCallback, unique_id, is_ack, "received"));
2476
2477   // Send response to a PING from server.
2478   if ((protocol_ >= kProtoSPDY4MinimumVersion && !is_ack) ||
2479       (protocol_ < kProtoSPDY4MinimumVersion && unique_id % 2 == 0)) {
2480     WritePingFrame(unique_id, true);
2481     return;
2482   }
2483
2484   --pings_in_flight_;
2485   if (pings_in_flight_ < 0) {
2486     RecordProtocolErrorHistogram(PROTOCOL_ERROR_UNEXPECTED_PING);
2487     DoDrainSession(ERR_SPDY_PROTOCOL_ERROR, "pings_in_flight_ is < 0.");
2488     pings_in_flight_ = 0;
2489     return;
2490   }
2491
2492   if (pings_in_flight_ > 0)
2493     return;
2494
2495   // We will record RTT in histogram when there are no more client sent
2496   // pings_in_flight_.
2497   RecordPingRTTHistogram(time_func_() - last_ping_sent_time_);
2498 }
2499
2500 void SpdySession::OnWindowUpdate(SpdyStreamId stream_id,
2501                                  uint32 delta_window_size) {
2502   CHECK(in_io_loop_);
2503
2504   DCHECK_LE(delta_window_size, static_cast<uint32>(kint32max));
2505   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_RECEIVED_WINDOW_UPDATE_FRAME,
2506                     base::Bind(&NetLogSpdyWindowUpdateFrameCallback, stream_id,
2507                                delta_window_size));
2508
2509   if (stream_id == kSessionFlowControlStreamId) {
2510     // WINDOW_UPDATE for the session.
2511     if (flow_control_state_ < FLOW_CONTROL_STREAM_AND_SESSION) {
2512       LOG(WARNING) << "Received WINDOW_UPDATE for session when "
2513                    << "session flow control is not turned on";
2514       // TODO(akalin): Record an error and close the session.
2515       return;
2516     }
2517
2518     if (delta_window_size < 1u) {
2519       RecordProtocolErrorHistogram(PROTOCOL_ERROR_INVALID_WINDOW_UPDATE_SIZE);
2520       DoDrainSession(
2521           ERR_SPDY_PROTOCOL_ERROR,
2522           "Received WINDOW_UPDATE with an invalid delta_window_size " +
2523               base::UintToString(delta_window_size));
2524       return;
2525     }
2526
2527     IncreaseSendWindowSize(static_cast<int32>(delta_window_size));
2528   } else {
2529     // WINDOW_UPDATE for a stream.
2530     if (flow_control_state_ < FLOW_CONTROL_STREAM) {
2531       // TODO(akalin): Record an error and close the session.
2532       LOG(WARNING) << "Received WINDOW_UPDATE for stream " << stream_id
2533                    << " when flow control is not turned on";
2534       return;
2535     }
2536
2537     ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2538
2539     if (it == active_streams_.end()) {
2540       // NOTE:  it may just be that the stream was cancelled.
2541       LOG(WARNING) << "Received WINDOW_UPDATE for invalid stream " << stream_id;
2542       return;
2543     }
2544
2545     SpdyStream* stream = it->second.stream;
2546     CHECK_EQ(stream->stream_id(), stream_id);
2547
2548     if (delta_window_size < 1u) {
2549       ResetStreamIterator(it,
2550                           RST_STREAM_FLOW_CONTROL_ERROR,
2551                           base::StringPrintf(
2552                               "Received WINDOW_UPDATE with an invalid "
2553                               "delta_window_size %ud", delta_window_size));
2554       return;
2555     }
2556
2557     CHECK_EQ(it->second.stream->stream_id(), stream_id);
2558     it->second.stream->IncreaseSendWindowSize(
2559         static_cast<int32>(delta_window_size));
2560   }
2561 }
2562
2563 bool SpdySession::TryCreatePushStream(SpdyStreamId stream_id,
2564                                       SpdyStreamId associated_stream_id,
2565                                       SpdyPriority priority,
2566                                       const SpdyHeaderBlock& headers) {
2567   // Server-initiated streams should have even sequence numbers.
2568   if ((stream_id & 0x1) != 0) {
2569     LOG(WARNING) << "Received invalid push stream id " << stream_id;
2570     if (GetProtocolVersion() > SPDY2)
2571       CloseSessionOnError(ERR_SPDY_PROTOCOL_ERROR, "Odd push stream id.");
2572     return false;
2573   }
2574
2575   if (GetProtocolVersion() > SPDY2) {
2576     if (stream_id <= last_accepted_push_stream_id_) {
2577       LOG(WARNING) << "Received push stream id lesser or equal to the last "
2578                    << "accepted before " << stream_id;
2579       CloseSessionOnError(
2580           ERR_SPDY_PROTOCOL_ERROR,
2581           "New push stream id must be greater than the last accepted.");
2582       return false;
2583     }
2584   }
2585
2586   if (IsStreamActive(stream_id)) {
2587     // For SPDY3 and higher we should not get here, we'll start going away
2588     // earlier on |last_seen_push_stream_id_| check.
2589     CHECK_GT(SPDY3, GetProtocolVersion());
2590     LOG(WARNING) << "Received push for active stream " << stream_id;
2591     return false;
2592   }
2593
2594   last_accepted_push_stream_id_ = stream_id;
2595
2596   RequestPriority request_priority =
2597       ConvertSpdyPriorityToRequestPriority(priority, GetProtocolVersion());
2598
2599   if (availability_state_ == STATE_GOING_AWAY) {
2600     // TODO(akalin): This behavior isn't in the SPDY spec, although it
2601     // probably should be.
2602     EnqueueResetStreamFrame(stream_id,
2603                             request_priority,
2604                             RST_STREAM_REFUSED_STREAM,
2605                             "push stream request received when going away");
2606     return false;
2607   }
2608
2609   if (associated_stream_id == 0) {
2610     // In SPDY4 0 stream id in PUSH_PROMISE frame leads to framer error and
2611     // session going away. We should never get here.
2612     CHECK_GT(SPDY4, GetProtocolVersion());
2613     std::string description = base::StringPrintf(
2614         "Received invalid associated stream id %d for pushed stream %d",
2615         associated_stream_id,
2616         stream_id);
2617     EnqueueResetStreamFrame(
2618         stream_id, request_priority, RST_STREAM_REFUSED_STREAM, description);
2619     return false;
2620   }
2621
2622   streams_pushed_count_++;
2623
2624   // TODO(mbelshe): DCHECK that this is a GET method?
2625
2626   // Verify that the response had a URL for us.
2627   GURL gurl = GetUrlFromHeaderBlock(headers, GetProtocolVersion(), true);
2628   if (!gurl.is_valid()) {
2629     EnqueueResetStreamFrame(stream_id,
2630                             request_priority,
2631                             RST_STREAM_PROTOCOL_ERROR,
2632                             "Pushed stream url was invalid: " + gurl.spec());
2633     return false;
2634   }
2635
2636   // Verify we have a valid stream association.
2637   ActiveStreamMap::iterator associated_it =
2638       active_streams_.find(associated_stream_id);
2639   if (associated_it == active_streams_.end()) {
2640     EnqueueResetStreamFrame(
2641         stream_id,
2642         request_priority,
2643         RST_STREAM_INVALID_STREAM,
2644         base::StringPrintf("Received push for inactive associated stream %d",
2645                            associated_stream_id));
2646     return false;
2647   }
2648
2649   // Check that the pushed stream advertises the same origin as its associated
2650   // stream. Bypass this check if and only if this session is with a SPDY proxy
2651   // that is trusted explicitly via the --trusted-spdy-proxy switch.
2652   if (trusted_spdy_proxy_.Equals(host_port_pair())) {
2653     // Disallow pushing of HTTPS content.
2654     if (gurl.SchemeIs("https")) {
2655       EnqueueResetStreamFrame(
2656           stream_id,
2657           request_priority,
2658           RST_STREAM_REFUSED_STREAM,
2659           base::StringPrintf("Rejected push of Cross Origin HTTPS content %d",
2660                              associated_stream_id));
2661     }
2662   } else {
2663     GURL associated_url(associated_it->second.stream->GetUrlFromHeaders());
2664     if (associated_url.GetOrigin() != gurl.GetOrigin()) {
2665       EnqueueResetStreamFrame(
2666           stream_id,
2667           request_priority,
2668           RST_STREAM_REFUSED_STREAM,
2669           base::StringPrintf("Rejected Cross Origin Push Stream %d",
2670                              associated_stream_id));
2671       return false;
2672     }
2673   }
2674
2675   // There should not be an existing pushed stream with the same path.
2676   PushedStreamMap::iterator pushed_it =
2677       unclaimed_pushed_streams_.lower_bound(gurl);
2678   if (pushed_it != unclaimed_pushed_streams_.end() &&
2679       pushed_it->first == gurl) {
2680     EnqueueResetStreamFrame(
2681         stream_id,
2682         request_priority,
2683         RST_STREAM_PROTOCOL_ERROR,
2684         "Received duplicate pushed stream with url: " + gurl.spec());
2685     return false;
2686   }
2687
2688   scoped_ptr<SpdyStream> stream(
2689       new SpdyStream(SPDY_PUSH_STREAM, GetWeakPtr(), gurl, request_priority,
2690                      stream_initial_send_window_size_,
2691                      stream_max_recv_window_size_, net_log_));
2692   stream->set_stream_id(stream_id);
2693
2694   // In spdy4/http2 PUSH_PROMISE arrives on associated stream.
2695   if (associated_it != active_streams_.end() && GetProtocolVersion() >= SPDY4) {
2696     associated_it->second.stream->IncrementRawReceivedBytes(
2697         last_compressed_frame_len_);
2698   } else {
2699     stream->IncrementRawReceivedBytes(last_compressed_frame_len_);
2700   }
2701
2702   last_compressed_frame_len_ = 0;
2703
2704   PushedStreamMap::iterator inserted_pushed_it =
2705       unclaimed_pushed_streams_.insert(
2706           pushed_it,
2707           std::make_pair(gurl, PushedStreamInfo(stream_id, time_func_())));
2708   DCHECK(inserted_pushed_it != pushed_it);
2709   DeleteExpiredPushedStreams();
2710
2711   InsertActivatedStream(stream.Pass());
2712
2713   ActiveStreamMap::iterator active_it = active_streams_.find(stream_id);
2714   if (active_it == active_streams_.end()) {
2715     NOTREACHED();
2716     return false;
2717   }
2718
2719   active_it->second.stream->OnPushPromiseHeadersReceived(headers);
2720   DCHECK(active_it->second.stream->IsReservedRemote());
2721   num_pushed_streams_++;
2722   return true;
2723 }
2724
2725 void SpdySession::OnPushPromise(SpdyStreamId stream_id,
2726                                 SpdyStreamId promised_stream_id,
2727                                 const SpdyHeaderBlock& headers) {
2728   CHECK(in_io_loop_);
2729
2730   if (net_log_.IsLogging()) {
2731     net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_RECV_PUSH_PROMISE,
2732                       base::Bind(&NetLogSpdyPushPromiseReceivedCallback,
2733                                  &headers, stream_id, promised_stream_id));
2734   }
2735
2736   // Any priority will do.
2737   // TODO(baranovich): pass parent stream id priority?
2738   if (!TryCreatePushStream(promised_stream_id, stream_id, 0, headers))
2739     return;
2740 }
2741
2742 void SpdySession::SendStreamWindowUpdate(SpdyStreamId stream_id,
2743                                          uint32 delta_window_size) {
2744   CHECK_GE(flow_control_state_, FLOW_CONTROL_STREAM);
2745   ActiveStreamMap::const_iterator it = active_streams_.find(stream_id);
2746   CHECK(it != active_streams_.end());
2747   CHECK_EQ(it->second.stream->stream_id(), stream_id);
2748   SendWindowUpdateFrame(
2749       stream_id, delta_window_size, it->second.stream->priority());
2750 }
2751
2752 void SpdySession::SendInitialData() {
2753   DCHECK(enable_sending_initial_data_);
2754
2755   if (send_connection_header_prefix_) {
2756     DCHECK_GE(protocol_, kProtoSPDY4MinimumVersion);
2757     DCHECK_LE(protocol_, kProtoSPDY4MaximumVersion);
2758     scoped_ptr<SpdyFrame> connection_header_prefix_frame(
2759         new SpdyFrame(const_cast<char*>(kHttp2ConnectionHeaderPrefix),
2760                       kHttp2ConnectionHeaderPrefixSize,
2761                       false /* take_ownership */));
2762     // Count the prefix as part of the subsequent SETTINGS frame.
2763     EnqueueSessionWrite(HIGHEST, SETTINGS,
2764                         connection_header_prefix_frame.Pass());
2765   }
2766
2767   // First, notify the server about the settings they should use when
2768   // communicating with us.
2769   SettingsMap settings_map;
2770   // Create a new settings frame notifying the server of our
2771   // max concurrent streams and initial window size.
2772   settings_map[SETTINGS_MAX_CONCURRENT_STREAMS] =
2773       SettingsFlagsAndValue(SETTINGS_FLAG_NONE, kMaxConcurrentPushedStreams);
2774   if (flow_control_state_ >= FLOW_CONTROL_STREAM &&
2775       stream_max_recv_window_size_ != GetInitialWindowSize(protocol_)) {
2776     settings_map[SETTINGS_INITIAL_WINDOW_SIZE] =
2777         SettingsFlagsAndValue(SETTINGS_FLAG_NONE, stream_max_recv_window_size_);
2778   }
2779   SendSettings(settings_map);
2780
2781   // Next, notify the server about our initial recv window size.
2782   if (flow_control_state_ == FLOW_CONTROL_STREAM_AND_SESSION) {
2783     // Bump up the receive window size to the real initial value. This
2784     // has to go here since the WINDOW_UPDATE frame sent by
2785     // IncreaseRecvWindowSize() call uses |buffered_spdy_framer_|.
2786     // This condition implies that |session_max_recv_window_size_| -
2787     // |session_recv_window_size_| doesn't overflow.
2788     DCHECK_GE(session_max_recv_window_size_, session_recv_window_size_);
2789     DCHECK_GE(session_recv_window_size_, 0);
2790     if (session_max_recv_window_size_ > session_recv_window_size_) {
2791       IncreaseRecvWindowSize(session_max_recv_window_size_ -
2792                              session_recv_window_size_);
2793     }
2794   }
2795
2796   if (protocol_ <= kProtoSPDY31) {
2797     // Finally, notify the server about the settings they have
2798     // previously told us to use when communicating with them (after
2799     // applying them).
2800     const SettingsMap& server_settings_map =
2801         http_server_properties_->GetSpdySettings(host_port_pair());
2802     if (server_settings_map.empty())
2803       return;
2804
2805     SettingsMap::const_iterator it =
2806         server_settings_map.find(SETTINGS_CURRENT_CWND);
2807     uint32 cwnd = (it != server_settings_map.end()) ? it->second.second : 0;
2808     UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwndSent", cwnd, 1, 200, 100);
2809
2810     for (SettingsMap::const_iterator it = server_settings_map.begin();
2811          it != server_settings_map.end(); ++it) {
2812       const SpdySettingsIds new_id = it->first;
2813       const uint32 new_val = it->second.second;
2814       HandleSetting(new_id, new_val);
2815     }
2816
2817     SendSettings(server_settings_map);
2818   }
2819 }
2820
2821
2822 void SpdySession::SendSettings(const SettingsMap& settings) {
2823   const SpdyMajorVersion protocol_version = GetProtocolVersion();
2824   net_log_.AddEvent(
2825       NetLog::TYPE_HTTP2_SESSION_SEND_SETTINGS,
2826       base::Bind(&NetLogSpdySendSettingsCallback, &settings, protocol_version));
2827   // Create the SETTINGS frame and send it.
2828   DCHECK(buffered_spdy_framer_.get());
2829   scoped_ptr<SpdyFrame> settings_frame(
2830       buffered_spdy_framer_->CreateSettings(settings));
2831   sent_settings_ = true;
2832   EnqueueSessionWrite(HIGHEST, SETTINGS, settings_frame.Pass());
2833 }
2834
2835 void SpdySession::HandleSetting(uint32 id, uint32 value) {
2836   switch (id) {
2837     case SETTINGS_MAX_CONCURRENT_STREAMS:
2838       max_concurrent_streams_ = std::min(static_cast<size_t>(value),
2839                                          kMaxConcurrentStreamLimit);
2840       ProcessPendingStreamRequests();
2841       break;
2842     case SETTINGS_INITIAL_WINDOW_SIZE: {
2843       if (flow_control_state_ < FLOW_CONTROL_STREAM) {
2844         net_log().AddEvent(
2845             NetLog::TYPE_HTTP2_SESSION_INITIAL_WINDOW_SIZE_NO_FLOW_CONTROL);
2846         return;
2847       }
2848
2849       if (value > static_cast<uint32>(kint32max)) {
2850         net_log().AddEvent(
2851             NetLog::TYPE_HTTP2_SESSION_INITIAL_WINDOW_SIZE_OUT_OF_RANGE,
2852             NetLog::IntegerCallback("initial_window_size", value));
2853         return;
2854       }
2855
2856       // SETTINGS_INITIAL_WINDOW_SIZE updates initial_send_window_size_ only.
2857       int32 delta_window_size =
2858           static_cast<int32>(value) - stream_initial_send_window_size_;
2859       stream_initial_send_window_size_ = static_cast<int32>(value);
2860       UpdateStreamsSendWindowSize(delta_window_size);
2861       net_log().AddEvent(
2862           NetLog::TYPE_HTTP2_SESSION_UPDATE_STREAMS_SEND_WINDOW_SIZE,
2863           NetLog::IntegerCallback("delta_window_size", delta_window_size));
2864       break;
2865     }
2866   }
2867 }
2868
2869 void SpdySession::UpdateStreamsSendWindowSize(int32 delta_window_size) {
2870   DCHECK_GE(flow_control_state_, FLOW_CONTROL_STREAM);
2871   for (ActiveStreamMap::iterator it = active_streams_.begin();
2872        it != active_streams_.end(); ++it) {
2873     it->second.stream->AdjustSendWindowSize(delta_window_size);
2874   }
2875
2876   for (CreatedStreamSet::const_iterator it = created_streams_.begin();
2877        it != created_streams_.end(); it++) {
2878     (*it)->AdjustSendWindowSize(delta_window_size);
2879   }
2880 }
2881
2882 void SpdySession::SendPrefacePingIfNoneInFlight() {
2883   if (pings_in_flight_ || !enable_ping_based_connection_checking_)
2884     return;
2885
2886   base::TimeTicks now = time_func_();
2887   // If there is no activity in the session, then send a preface-PING.
2888   if ((now - last_activity_time_) > connection_at_risk_of_loss_time_)
2889     SendPrefacePing();
2890 }
2891
2892 void SpdySession::SendPrefacePing() {
2893   WritePingFrame(next_ping_id_, false);
2894 }
2895
2896 void SpdySession::SendWindowUpdateFrame(SpdyStreamId stream_id,
2897                                         uint32 delta_window_size,
2898                                         RequestPriority priority) {
2899   CHECK_GE(flow_control_state_, FLOW_CONTROL_STREAM);
2900   ActiveStreamMap::const_iterator it = active_streams_.find(stream_id);
2901   if (it != active_streams_.end()) {
2902     CHECK_EQ(it->second.stream->stream_id(), stream_id);
2903   } else {
2904     CHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
2905     CHECK_EQ(stream_id, kSessionFlowControlStreamId);
2906   }
2907
2908   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_SENT_WINDOW_UPDATE_FRAME,
2909                     base::Bind(&NetLogSpdyWindowUpdateFrameCallback, stream_id,
2910                                delta_window_size));
2911
2912   DCHECK(buffered_spdy_framer_.get());
2913   scoped_ptr<SpdyFrame> window_update_frame(
2914       buffered_spdy_framer_->CreateWindowUpdate(stream_id, delta_window_size));
2915   EnqueueSessionWrite(priority, WINDOW_UPDATE, window_update_frame.Pass());
2916 }
2917
2918 void SpdySession::WritePingFrame(SpdyPingId unique_id, bool is_ack) {
2919   DCHECK(buffered_spdy_framer_.get());
2920   scoped_ptr<SpdyFrame> ping_frame(
2921       buffered_spdy_framer_->CreatePingFrame(unique_id, is_ack));
2922   EnqueueSessionWrite(HIGHEST, PING, ping_frame.Pass());
2923
2924   if (net_log().IsLogging()) {
2925     net_log().AddEvent(
2926         NetLog::TYPE_HTTP2_SESSION_PING,
2927         base::Bind(&NetLogSpdyPingCallback, unique_id, is_ack, "sent"));
2928   }
2929   if (!is_ack) {
2930     next_ping_id_ += 2;
2931     ++pings_in_flight_;
2932     PlanToCheckPingStatus();
2933     last_ping_sent_time_ = time_func_();
2934   }
2935 }
2936
2937 void SpdySession::PlanToCheckPingStatus() {
2938   if (check_ping_status_pending_)
2939     return;
2940
2941   check_ping_status_pending_ = true;
2942   base::MessageLoop::current()->PostDelayedTask(
2943       FROM_HERE,
2944       base::Bind(&SpdySession::CheckPingStatus, weak_factory_.GetWeakPtr(),
2945                  time_func_()), hung_interval_);
2946 }
2947
2948 void SpdySession::CheckPingStatus(base::TimeTicks last_check_time) {
2949   CHECK(!in_io_loop_);
2950
2951   // Check if we got a response back for all PINGs we had sent.
2952   if (pings_in_flight_ == 0) {
2953     check_ping_status_pending_ = false;
2954     return;
2955   }
2956
2957   DCHECK(check_ping_status_pending_);
2958
2959   base::TimeTicks now = time_func_();
2960   base::TimeDelta delay = hung_interval_ - (now - last_activity_time_);
2961
2962   if (delay.InMilliseconds() < 0 || last_activity_time_ < last_check_time) {
2963     // Track all failed PING messages in a separate bucket.
2964     RecordPingRTTHistogram(base::TimeDelta::Max());
2965     DoDrainSession(ERR_SPDY_PING_FAILED, "Failed ping.");
2966     return;
2967   }
2968
2969   // Check the status of connection after a delay.
2970   base::MessageLoop::current()->PostDelayedTask(
2971       FROM_HERE,
2972       base::Bind(&SpdySession::CheckPingStatus, weak_factory_.GetWeakPtr(),
2973                  now),
2974       delay);
2975 }
2976
2977 void SpdySession::RecordPingRTTHistogram(base::TimeDelta duration) {
2978   UMA_HISTOGRAM_TIMES("Net.SpdyPing.RTT", duration);
2979 }
2980
2981 void SpdySession::RecordProtocolErrorHistogram(
2982     SpdyProtocolErrorDetails details) {
2983   UMA_HISTOGRAM_ENUMERATION("Net.SpdySessionErrorDetails2", details,
2984                             NUM_SPDY_PROTOCOL_ERROR_DETAILS);
2985   if (EndsWith(host_port_pair().host(), "google.com", false)) {
2986     UMA_HISTOGRAM_ENUMERATION("Net.SpdySessionErrorDetails_Google2", details,
2987                               NUM_SPDY_PROTOCOL_ERROR_DETAILS);
2988   }
2989 }
2990
2991 void SpdySession::RecordHistograms() {
2992   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdyStreamsPerSession",
2993                               streams_initiated_count_,
2994                               0, 300, 50);
2995   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdyStreamsPushedPerSession",
2996                               streams_pushed_count_,
2997                               0, 300, 50);
2998   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdyStreamsPushedAndClaimedPerSession",
2999                               streams_pushed_and_claimed_count_,
3000                               0, 300, 50);
3001   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdyStreamsAbandonedPerSession",
3002                               streams_abandoned_count_,
3003                               0, 300, 50);
3004   UMA_HISTOGRAM_ENUMERATION("Net.SpdySettingsSent",
3005                             sent_settings_ ? 1 : 0, 2);
3006   UMA_HISTOGRAM_ENUMERATION("Net.SpdySettingsReceived",
3007                             received_settings_ ? 1 : 0, 2);
3008   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdyStreamStallsPerSession",
3009                               stalled_streams_,
3010                               0, 300, 50);
3011   UMA_HISTOGRAM_ENUMERATION("Net.SpdySessionsWithStalls",
3012                             stalled_streams_ > 0 ? 1 : 0, 2);
3013
3014   if (received_settings_) {
3015     // Enumerate the saved settings, and set histograms for it.
3016     const SettingsMap& settings_map =
3017         http_server_properties_->GetSpdySettings(host_port_pair());
3018
3019     SettingsMap::const_iterator it;
3020     for (it = settings_map.begin(); it != settings_map.end(); ++it) {
3021       const SpdySettingsIds id = it->first;
3022       const uint32 val = it->second.second;
3023       switch (id) {
3024         case SETTINGS_CURRENT_CWND:
3025           // Record several different histograms to see if cwnd converges
3026           // for larger volumes of data being sent.
3027           UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwnd",
3028                                       val, 1, 200, 100);
3029           if (total_bytes_received_ > 10 * 1024) {
3030             UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwnd10K",
3031                                         val, 1, 200, 100);
3032             if (total_bytes_received_ > 25 * 1024) {
3033               UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwnd25K",
3034                                           val, 1, 200, 100);
3035               if (total_bytes_received_ > 50 * 1024) {
3036                 UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwnd50K",
3037                                             val, 1, 200, 100);
3038                 if (total_bytes_received_ > 100 * 1024) {
3039                   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwnd100K",
3040                                               val, 1, 200, 100);
3041                 }
3042               }
3043             }
3044           }
3045           break;
3046         case SETTINGS_ROUND_TRIP_TIME:
3047           UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsRTT",
3048                                       val, 1, 1200, 100);
3049           break;
3050         case SETTINGS_DOWNLOAD_RETRANS_RATE:
3051           UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsRetransRate",
3052                                       val, 1, 100, 50);
3053           break;
3054         default:
3055           break;
3056       }
3057     }
3058   }
3059 }
3060
3061 void SpdySession::CompleteStreamRequest(
3062     const base::WeakPtr<SpdyStreamRequest>& pending_request) {
3063   // Abort if the request has already been cancelled.
3064   if (!pending_request)
3065     return;
3066
3067   base::WeakPtr<SpdyStream> stream;
3068   int rv = TryCreateStream(pending_request, &stream);
3069
3070   if (rv == OK) {
3071     DCHECK(stream);
3072     pending_request->OnRequestCompleteSuccess(stream);
3073     return;
3074   }
3075   DCHECK(!stream);
3076
3077   if (rv != ERR_IO_PENDING) {
3078     pending_request->OnRequestCompleteFailure(rv);
3079   }
3080 }
3081
3082 SSLClientSocket* SpdySession::GetSSLClientSocket() const {
3083   if (!is_secure_)
3084     return NULL;
3085   SSLClientSocket* ssl_socket =
3086       reinterpret_cast<SSLClientSocket*>(connection_->socket());
3087   DCHECK(ssl_socket);
3088   return ssl_socket;
3089 }
3090
3091 void SpdySession::OnWriteBufferConsumed(
3092     size_t frame_payload_size,
3093     size_t consume_size,
3094     SpdyBuffer::ConsumeSource consume_source) {
3095   // We can be called with |in_io_loop_| set if a write SpdyBuffer is
3096   // deleted (e.g., a stream is closed due to incoming data).
3097
3098   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3099
3100   if (consume_source == SpdyBuffer::DISCARD) {
3101     // If we're discarding a frame or part of it, increase the send
3102     // window by the number of discarded bytes. (Although if we're
3103     // discarding part of a frame, it's probably because of a write
3104     // error and we'll be tearing down the session soon.)
3105     size_t remaining_payload_bytes = std::min(consume_size, frame_payload_size);
3106     DCHECK_GT(remaining_payload_bytes, 0u);
3107     IncreaseSendWindowSize(static_cast<int32>(remaining_payload_bytes));
3108   }
3109   // For consumed bytes, the send window is increased when we receive
3110   // a WINDOW_UPDATE frame.
3111 }
3112
3113 void SpdySession::IncreaseSendWindowSize(int32 delta_window_size) {
3114   // We can be called with |in_io_loop_| set if a SpdyBuffer is
3115   // deleted (e.g., a stream is closed due to incoming data).
3116
3117   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3118   DCHECK_GE(delta_window_size, 1);
3119
3120   // Check for overflow.
3121   int32 max_delta_window_size = kint32max - session_send_window_size_;
3122   if (delta_window_size > max_delta_window_size) {
3123     RecordProtocolErrorHistogram(PROTOCOL_ERROR_INVALID_WINDOW_UPDATE_SIZE);
3124     DoDrainSession(
3125         ERR_SPDY_PROTOCOL_ERROR,
3126         "Received WINDOW_UPDATE [delta: " +
3127             base::IntToString(delta_window_size) +
3128             "] for session overflows session_send_window_size_ [current: " +
3129             base::IntToString(session_send_window_size_) + "]");
3130     return;
3131   }
3132
3133   session_send_window_size_ += delta_window_size;
3134
3135   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_UPDATE_SEND_WINDOW,
3136                     base::Bind(&NetLogSpdySessionWindowUpdateCallback,
3137                                delta_window_size, session_send_window_size_));
3138
3139   DCHECK(!IsSendStalled());
3140   ResumeSendStalledStreams();
3141 }
3142
3143 void SpdySession::DecreaseSendWindowSize(int32 delta_window_size) {
3144   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3145
3146   // We only call this method when sending a frame. Therefore,
3147   // |delta_window_size| should be within the valid frame size range.
3148   DCHECK_GE(delta_window_size, 1);
3149   DCHECK_LE(delta_window_size, kMaxSpdyFrameChunkSize);
3150
3151   // |send_window_size_| should have been at least |delta_window_size| for
3152   // this call to happen.
3153   DCHECK_GE(session_send_window_size_, delta_window_size);
3154
3155   session_send_window_size_ -= delta_window_size;
3156
3157   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_UPDATE_SEND_WINDOW,
3158                     base::Bind(&NetLogSpdySessionWindowUpdateCallback,
3159                                -delta_window_size, session_send_window_size_));
3160 }
3161
3162 void SpdySession::OnReadBufferConsumed(
3163     size_t consume_size,
3164     SpdyBuffer::ConsumeSource consume_source) {
3165   // We can be called with |in_io_loop_| set if a read SpdyBuffer is
3166   // deleted (e.g., discarded by a SpdyReadQueue).
3167
3168   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3169   DCHECK_GE(consume_size, 1u);
3170   DCHECK_LE(consume_size, static_cast<size_t>(kint32max));
3171
3172   IncreaseRecvWindowSize(static_cast<int32>(consume_size));
3173 }
3174
3175 void SpdySession::IncreaseRecvWindowSize(int32 delta_window_size) {
3176   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3177   DCHECK_GE(session_unacked_recv_window_bytes_, 0);
3178   DCHECK_GE(session_recv_window_size_, session_unacked_recv_window_bytes_);
3179   DCHECK_GE(delta_window_size, 1);
3180   // Check for overflow.
3181   DCHECK_LE(delta_window_size, kint32max - session_recv_window_size_);
3182
3183   session_recv_window_size_ += delta_window_size;
3184   net_log_.AddEvent(NetLog::TYPE_HTTP2_STREAM_UPDATE_RECV_WINDOW,
3185                     base::Bind(&NetLogSpdySessionWindowUpdateCallback,
3186                                delta_window_size, session_recv_window_size_));
3187
3188   session_unacked_recv_window_bytes_ += delta_window_size;
3189   if (session_unacked_recv_window_bytes_ > session_max_recv_window_size_ / 2) {
3190     SendWindowUpdateFrame(kSessionFlowControlStreamId,
3191                           session_unacked_recv_window_bytes_,
3192                           HIGHEST);
3193     session_unacked_recv_window_bytes_ = 0;
3194   }
3195 }
3196
3197 void SpdySession::DecreaseRecvWindowSize(int32 delta_window_size) {
3198   CHECK(in_io_loop_);
3199   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3200   DCHECK_GE(delta_window_size, 1);
3201
3202   // Since we never decrease the initial receive window size,
3203   // |delta_window_size| should never cause |recv_window_size_| to go
3204   // negative. If we do, the receive window isn't being respected.
3205   if (delta_window_size > session_recv_window_size_) {
3206     RecordProtocolErrorHistogram(PROTOCOL_ERROR_RECEIVE_WINDOW_VIOLATION);
3207     DoDrainSession(
3208         ERR_SPDY_FLOW_CONTROL_ERROR,
3209         "delta_window_size is " + base::IntToString(delta_window_size) +
3210             " in DecreaseRecvWindowSize, which is larger than the receive " +
3211             "window size of " + base::IntToString(session_recv_window_size_));
3212     return;
3213   }
3214
3215   session_recv_window_size_ -= delta_window_size;
3216   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_UPDATE_RECV_WINDOW,
3217                     base::Bind(&NetLogSpdySessionWindowUpdateCallback,
3218                                -delta_window_size, session_recv_window_size_));
3219 }
3220
3221 void SpdySession::QueueSendStalledStream(const SpdyStream& stream) {
3222   DCHECK(stream.send_stalled_by_flow_control());
3223   RequestPriority priority = stream.priority();
3224   CHECK_GE(priority, MINIMUM_PRIORITY);
3225   CHECK_LE(priority, MAXIMUM_PRIORITY);
3226   stream_send_unstall_queue_[priority].push_back(stream.stream_id());
3227 }
3228
3229 void SpdySession::ResumeSendStalledStreams() {
3230   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3231
3232   // We don't have to worry about new streams being queued, since
3233   // doing so would cause IsSendStalled() to return true. But we do
3234   // have to worry about streams being closed, as well as ourselves
3235   // being closed.
3236
3237   while (!IsSendStalled()) {
3238     size_t old_size = 0;
3239 #if DCHECK_IS_ON()
3240     old_size = GetTotalSize(stream_send_unstall_queue_);
3241 #endif
3242
3243     SpdyStreamId stream_id = PopStreamToPossiblyResume();
3244     if (stream_id == 0)
3245       break;
3246     ActiveStreamMap::const_iterator it = active_streams_.find(stream_id);
3247     // The stream may actually still be send-stalled after this (due
3248     // to its own send window) but that's okay -- it'll then be
3249     // resumed once its send window increases.
3250     if (it != active_streams_.end())
3251       it->second.stream->PossiblyResumeIfSendStalled();
3252
3253     // The size should decrease unless we got send-stalled again.
3254     if (!IsSendStalled())
3255       DCHECK_LT(GetTotalSize(stream_send_unstall_queue_), old_size);
3256   }
3257 }
3258
3259 SpdyStreamId SpdySession::PopStreamToPossiblyResume() {
3260   for (int i = MAXIMUM_PRIORITY; i >= MINIMUM_PRIORITY; --i) {
3261     std::deque<SpdyStreamId>* queue = &stream_send_unstall_queue_[i];
3262     if (!queue->empty()) {
3263       SpdyStreamId stream_id = queue->front();
3264       queue->pop_front();
3265       return stream_id;
3266     }
3267   }
3268   return 0;
3269 }
3270
3271 }  // namespace net