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 stream_initial_recv_window_size,
 612     size_t initial_max_concurrent_streams,
 613     size_t max_concurrent_streams_limit,
 614     TimeFunc time_func,
 615     const HostPortPair& trusted_spdy_proxy,
 616     NetLog* net_log)
 617     : in_io_loop_(false),
 618       spdy_session_key_(spdy_session_key),
 619       pool_(NULL),
 620       http_server_properties_(http_server_properties),
 621       transport_security_state_(transport_security_state),
 622       read_buffer_(new IOBuffer(kReadBufferSize)),
 623       stream_hi_water_mark_(kFirstStreamId),
 624       last_accepted_push_stream_id_(0),
 625       num_pushed_streams_(0u),
 626       num_active_pushed_streams_(0u),
 627       in_flight_write_frame_type_(DATA),
 628       in_flight_write_frame_size_(0),
 629       is_secure_(false),
 630       certificate_error_code_(OK),
 631       availability_state_(STATE_AVAILABLE),
 632       read_state_(READ_STATE_DO_READ),
 633       write_state_(WRITE_STATE_IDLE),
 634       error_on_close_(OK),
 635       max_concurrent_streams_(initial_max_concurrent_streams == 0
 636                                   ? kInitialMaxConcurrentStreams
 637                                   : initial_max_concurrent_streams),
 638       max_concurrent_streams_limit_(max_concurrent_streams_limit == 0
 639                                         ? kMaxConcurrentStreamLimit
 640                                         : max_concurrent_streams_limit),
 641       max_concurrent_pushed_streams_(kMaxConcurrentPushedStreams),
 642       streams_initiated_count_(0),
 643       streams_pushed_count_(0),
 644       streams_pushed_and_claimed_count_(0),
 645       streams_abandoned_count_(0),
 646       total_bytes_received_(0),
 647       sent_settings_(false),
 648       received_settings_(false),
 649       stalled_streams_(0),
 650       pings_in_flight_(0),
 651       next_ping_id_(1),
 652       last_activity_time_(time_func()),
 653       last_compressed_frame_len_(0),
 654       check_ping_status_pending_(false),
 655       send_connection_header_prefix_(false),
 656       flow_control_state_(FLOW_CONTROL_NONE),
 657       stream_initial_send_window_size_(GetInitialWindowSize(default_protocol)),
 658       stream_initial_recv_window_size_(stream_initial_recv_window_size == 0
 659                                            ? kDefaultInitialRecvWindowSize
 660                                            : stream_initial_recv_window_size),
 661       session_send_window_size_(0),
 662       session_recv_window_size_(0),
 663       session_unacked_recv_window_bytes_(0),
 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(),
 894                      stream_initial_send_window_size_,
 895                      stream_initial_recv_window_size_,
 896                      request.net_log()));
 897   *stream = new_stream->GetWeakPtr();
 898   InsertCreatedStream(new_stream.Pass());
 899
 900   UMA_HISTOGRAM_CUSTOM_COUNTS(
 901       "Net.SpdyPriorityCount",
 902       static_cast<int>(request.priority()), 0, 10, 11);
 903
 904   return OK;
 905 }
 906
 907 void SpdySession::CancelStreamRequest(
 908     const base::WeakPtr<SpdyStreamRequest>& request) {
 909   DCHECK(request);
 910   RequestPriority priority = request->priority();
 911   CHECK_GE(priority, MINIMUM_PRIORITY);
 912   CHECK_LE(priority, MAXIMUM_PRIORITY);
 913
 914 #if DCHECK_IS_ON()
 915   // |request| should not be in a queue not matching its priority.
 916   for (int i = MINIMUM_PRIORITY; i <= MAXIMUM_PRIORITY; ++i) {
 917     if (priority == i)
 918       continue;
 919     PendingStreamRequestQueue* queue = &pending_create_stream_queues_[i];
 920     DCHECK(std::find_if(queue->begin(),
 921                         queue->end(),
 922                         RequestEquals(request)) == queue->end());
 923   }
 924 #endif
 925
 926   PendingStreamRequestQueue* queue =
 927       &pending_create_stream_queues_[priority];
 928   // Remove |request| from |queue| while preserving the order of the
 929   // other elements.
 930   PendingStreamRequestQueue::iterator it =
 931       std::find_if(queue->begin(), queue->end(), RequestEquals(request));
 932   // The request may already be removed if there's a
 933   // CompleteStreamRequest() in flight.
 934   if (it != queue->end()) {
 935     it = queue->erase(it);
 936     // |request| should be in the queue at most once, and if it is
 937     // present, should not be pending completion.
 938     DCHECK(std::find_if(it, queue->end(), RequestEquals(request)) ==
 939            queue->end());
 940   }
 941 }
 942
 943 base::WeakPtr<SpdyStreamRequest> SpdySession::GetNextPendingStreamRequest() {
 944   for (int j = MAXIMUM_PRIORITY; j >= MINIMUM_PRIORITY; --j) {
 945     if (pending_create_stream_queues_[j].empty())
 946       continue;
 947
 948     base::WeakPtr<SpdyStreamRequest> pending_request =
 949         pending_create_stream_queues_[j].front();
 950     DCHECK(pending_request);
 951     pending_create_stream_queues_[j].pop_front();
 952     return pending_request;
 953   }
 954   return base::WeakPtr<SpdyStreamRequest>();
 955 }
 956
 957 void SpdySession::ProcessPendingStreamRequests() {
 958   // Like |max_concurrent_streams_|, 0 means infinite for
 959   // |max_requests_to_process|.
 960   size_t max_requests_to_process = 0;
 961   if (max_concurrent_streams_ != 0) {
 962     max_requests_to_process =
 963         max_concurrent_streams_ -
 964         (active_streams_.size() + created_streams_.size());
 965   }
 966   for (size_t i = 0;
 967        max_requests_to_process == 0 || i < max_requests_to_process; ++i) {
 968     base::WeakPtr<SpdyStreamRequest> pending_request =
 969         GetNextPendingStreamRequest();
 970     if (!pending_request)
 971       break;
 972
 973     // Note that this post can race with other stream creations, and it's
 974     // possible that the un-stalled stream will be stalled again if it loses.
 975     // TODO(jgraettinger): Provide stronger ordering guarantees.
 976     base::MessageLoop::current()->PostTask(
 977         FROM_HERE,
 978         base::Bind(&SpdySession::CompleteStreamRequest,
 979                    weak_factory_.GetWeakPtr(),
 980                    pending_request));
 981   }
 982 }
 983
 984 void SpdySession::AddPooledAlias(const SpdySessionKey& alias_key) {
 985   pooled_aliases_.insert(alias_key);
 986 }
 987
 988 SpdyMajorVersion SpdySession::GetProtocolVersion() const {
 989   DCHECK(buffered_spdy_framer_.get());
 990   return buffered_spdy_framer_->protocol_version();
 991 }
 992
 993 bool SpdySession::HasAcceptableTransportSecurity() const {
 994   // If we're not even using TLS, we have no standards to meet.
 995   if (!is_secure_) {
 996     return true;
 997   }
 998
 999   // We don't enforce transport security standards for older SPDY versions.
1000   if (GetProtocolVersion() < SPDY4) {
1001     return true;
1002   }
1003
1004   SSLInfo ssl_info;
1005   CHECK(connection_->socket()->GetSSLInfo(&ssl_info));
1006
1007   // HTTP/2 requires TLS 1.2+
1008   if (SSLConnectionStatusToVersion(ssl_info.connection_status) <
1009       SSL_CONNECTION_VERSION_TLS1_2) {
1010     return false;
1011   }
1012
1013   if (!IsSecureTLSCipherSuite(
1014           SSLConnectionStatusToCipherSuite(ssl_info.connection_status))) {
1015     return false;
1016   }
1017
1018   return true;
1019 }
1020
1021 base::WeakPtr<SpdySession> SpdySession::GetWeakPtr() {
1022   return weak_factory_.GetWeakPtr();
1023 }
1024
1025 bool SpdySession::CloseOneIdleConnection() {
1026   CHECK(!in_io_loop_);
1027   DCHECK(pool_);
1028   if (active_streams_.empty()) {
1029     DoDrainSession(ERR_CONNECTION_CLOSED, "Closing idle connection.");
1030   }
1031   // Return false as the socket wasn't immediately closed.
1032   return false;
1033 }
1034
1035 void SpdySession::EnqueueStreamWrite(
1036     const base::WeakPtr<SpdyStream>& stream,
1037     SpdyFrameType frame_type,
1038     scoped_ptr<SpdyBufferProducer> producer) {
1039   DCHECK(frame_type == HEADERS ||
1040          frame_type == DATA ||
1041          frame_type == CREDENTIAL ||
1042          frame_type == SYN_STREAM);
1043   EnqueueWrite(stream->priority(), frame_type, producer.Pass(), stream);
1044 }
1045
1046 scoped_ptr<SpdyFrame> SpdySession::CreateSynStream(
1047     SpdyStreamId stream_id,
1048     RequestPriority priority,
1049     SpdyControlFlags flags,
1050     const SpdyHeaderBlock& block) {
1051   ActiveStreamMap::const_iterator it = active_streams_.find(stream_id);
1052   CHECK(it != active_streams_.end());
1053   CHECK_EQ(it->second.stream->stream_id(), stream_id);
1054
1055   SendPrefacePingIfNoneInFlight();
1056
1057   DCHECK(buffered_spdy_framer_.get());
1058   SpdyPriority spdy_priority =
1059       ConvertRequestPriorityToSpdyPriority(priority, GetProtocolVersion());
1060
1061   scoped_ptr<SpdyFrame> syn_frame;
1062   // TODO(hkhalil): Avoid copy of |block|.
1063   if (GetProtocolVersion() <= SPDY3) {
1064     SpdySynStreamIR syn_stream(stream_id);
1065     syn_stream.set_associated_to_stream_id(0);
1066     syn_stream.set_priority(spdy_priority);
1067     syn_stream.set_fin((flags & CONTROL_FLAG_FIN) != 0);
1068     syn_stream.set_unidirectional((flags & CONTROL_FLAG_UNIDIRECTIONAL) != 0);
1069     syn_stream.set_name_value_block(block);
1070     syn_frame.reset(buffered_spdy_framer_->SerializeFrame(syn_stream));
1071   } else {
1072     SpdyHeadersIR headers(stream_id);
1073     headers.set_priority(spdy_priority);
1074     headers.set_has_priority(true);
1075     headers.set_fin((flags & CONTROL_FLAG_FIN) != 0);
1076     headers.set_name_value_block(block);
1077     syn_frame.reset(buffered_spdy_framer_->SerializeFrame(headers));
1078   }
1079
1080   streams_initiated_count_++;
1081
1082   if (net_log().IsLogging()) {
1083     const NetLog::EventType type =
1084         (GetProtocolVersion() <= SPDY3)
1085             ? NetLog::TYPE_HTTP2_SESSION_SYN_STREAM
1086             : NetLog::TYPE_HTTP2_SESSION_SEND_HEADERS;
1087     net_log().AddEvent(type,
1088                        base::Bind(&NetLogSpdySynStreamSentCallback, &block,
1089                                   (flags & CONTROL_FLAG_FIN) != 0,
1090                                   (flags & CONTROL_FLAG_UNIDIRECTIONAL) != 0,
1091                                   spdy_priority, stream_id));
1092   }
1093
1094   return syn_frame.Pass();
1095 }
1096
1097 scoped_ptr<SpdyBuffer> SpdySession::CreateDataBuffer(SpdyStreamId stream_id,
1098                                                      IOBuffer* data,
1099                                                      int len,
1100                                                      SpdyDataFlags flags) {
1101   if (availability_state_ == STATE_DRAINING) {
1102     return scoped_ptr<SpdyBuffer>();
1103   }
1104
1105   ActiveStreamMap::const_iterator it = active_streams_.find(stream_id);
1106   CHECK(it != active_streams_.end());
1107   SpdyStream* stream = it->second.stream;
1108   CHECK_EQ(stream->stream_id(), stream_id);
1109
1110   if (len < 0) {
1111     NOTREACHED();
1112     return scoped_ptr<SpdyBuffer>();
1113   }
1114
1115   int effective_len = std::min(len, kMaxSpdyFrameChunkSize);
1116
1117   bool send_stalled_by_stream =
1118       (flow_control_state_ >= FLOW_CONTROL_STREAM) &&
1119       (stream->send_window_size() <= 0);
1120   bool send_stalled_by_session = IsSendStalled();
1121
1122   // NOTE: There's an enum of the same name in histograms.xml.
1123   enum SpdyFrameFlowControlState {
1124     SEND_NOT_STALLED,
1125     SEND_STALLED_BY_STREAM,
1126     SEND_STALLED_BY_SESSION,
1127     SEND_STALLED_BY_STREAM_AND_SESSION,
1128   };
1129
1130   SpdyFrameFlowControlState frame_flow_control_state = SEND_NOT_STALLED;
1131   if (send_stalled_by_stream) {
1132     if (send_stalled_by_session) {
1133       frame_flow_control_state = SEND_STALLED_BY_STREAM_AND_SESSION;
1134     } else {
1135       frame_flow_control_state = SEND_STALLED_BY_STREAM;
1136     }
1137   } else if (send_stalled_by_session) {
1138     frame_flow_control_state = SEND_STALLED_BY_SESSION;
1139   }
1140
1141   if (flow_control_state_ == FLOW_CONTROL_STREAM) {
1142     UMA_HISTOGRAM_ENUMERATION(
1143         "Net.SpdyFrameStreamFlowControlState",
1144         frame_flow_control_state,
1145         SEND_STALLED_BY_STREAM + 1);
1146   } else if (flow_control_state_ == FLOW_CONTROL_STREAM_AND_SESSION) {
1147     UMA_HISTOGRAM_ENUMERATION(
1148         "Net.SpdyFrameStreamAndSessionFlowControlState",
1149         frame_flow_control_state,
1150         SEND_STALLED_BY_STREAM_AND_SESSION + 1);
1151   }
1152
1153   // Obey send window size of the stream if stream flow control is
1154   // enabled.
1155   if (flow_control_state_ >= FLOW_CONTROL_STREAM) {
1156     if (send_stalled_by_stream) {
1157       stream->set_send_stalled_by_flow_control(true);
1158       // Even though we're currently stalled only by the stream, we
1159       // might end up being stalled by the session also.
1160       QueueSendStalledStream(*stream);
1161       net_log().AddEvent(
1162           NetLog::TYPE_HTTP2_SESSION_STREAM_STALLED_BY_STREAM_SEND_WINDOW,
1163           NetLog::IntegerCallback("stream_id", stream_id));
1164       return scoped_ptr<SpdyBuffer>();
1165     }
1166
1167     effective_len = std::min(effective_len, stream->send_window_size());
1168   }
1169
1170   // Obey send window size of the session if session flow control is
1171   // enabled.
1172   if (flow_control_state_ == FLOW_CONTROL_STREAM_AND_SESSION) {
1173     if (send_stalled_by_session) {
1174       stream->set_send_stalled_by_flow_control(true);
1175       QueueSendStalledStream(*stream);
1176       net_log().AddEvent(
1177           NetLog::TYPE_HTTP2_SESSION_STREAM_STALLED_BY_SESSION_SEND_WINDOW,
1178           NetLog::IntegerCallback("stream_id", stream_id));
1179       return scoped_ptr<SpdyBuffer>();
1180     }
1181
1182     effective_len = std::min(effective_len, session_send_window_size_);
1183   }
1184
1185   DCHECK_GE(effective_len, 0);
1186
1187   // Clear FIN flag if only some of the data will be in the data
1188   // frame.
1189   if (effective_len < len)
1190     flags = static_cast<SpdyDataFlags>(flags & ~DATA_FLAG_FIN);
1191
1192   if (net_log().IsLogging()) {
1193     net_log().AddEvent(NetLog::TYPE_HTTP2_SESSION_SEND_DATA,
1194                        base::Bind(&NetLogSpdyDataCallback, stream_id,
1195                                   effective_len, (flags & DATA_FLAG_FIN) != 0));
1196   }
1197
1198   // Send PrefacePing for DATA_FRAMEs with nonzero payload size.
1199   if (effective_len > 0)
1200     SendPrefacePingIfNoneInFlight();
1201
1202   // TODO(mbelshe): reduce memory copies here.
1203   DCHECK(buffered_spdy_framer_.get());
1204   scoped_ptr<SpdyFrame> frame(
1205       buffered_spdy_framer_->CreateDataFrame(
1206           stream_id, data->data(),
1207           static_cast<uint32>(effective_len), flags));
1208
1209   scoped_ptr<SpdyBuffer> data_buffer(new SpdyBuffer(frame.Pass()));
1210
1211   // Send window size is based on payload size, so nothing to do if this is
1212   // just a FIN with no payload.
1213   if (flow_control_state_ == FLOW_CONTROL_STREAM_AND_SESSION &&
1214       effective_len != 0) {
1215     DecreaseSendWindowSize(static_cast<int32>(effective_len));
1216     data_buffer->AddConsumeCallback(
1217         base::Bind(&SpdySession::OnWriteBufferConsumed,
1218                    weak_factory_.GetWeakPtr(),
1219                    static_cast<size_t>(effective_len)));
1220   }
1221
1222   return data_buffer.Pass();
1223 }
1224
1225 void SpdySession::CloseActiveStream(SpdyStreamId stream_id, int status) {
1226   DCHECK_NE(stream_id, 0u);
1227
1228   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
1229   if (it == active_streams_.end()) {
1230     NOTREACHED();
1231     return;
1232   }
1233
1234   CloseActiveStreamIterator(it, status);
1235 }
1236
1237 void SpdySession::CloseCreatedStream(
1238     const base::WeakPtr<SpdyStream>& stream, int status) {
1239   DCHECK_EQ(stream->stream_id(), 0u);
1240
1241   CreatedStreamSet::iterator it = created_streams_.find(stream.get());
1242   if (it == created_streams_.end()) {
1243     NOTREACHED();
1244     return;
1245   }
1246
1247   CloseCreatedStreamIterator(it, status);
1248 }
1249
1250 void SpdySession::ResetStream(SpdyStreamId stream_id,
1251                               SpdyRstStreamStatus status,
1252                               const std::string& description) {
1253   DCHECK_NE(stream_id, 0u);
1254
1255   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
1256   if (it == active_streams_.end()) {
1257     NOTREACHED();
1258     return;
1259   }
1260
1261   ResetStreamIterator(it, status, description);
1262 }
1263
1264 bool SpdySession::IsStreamActive(SpdyStreamId stream_id) const {
1265   return ContainsKey(active_streams_, stream_id);
1266 }
1267
1268 LoadState SpdySession::GetLoadState() const {
1269   // Just report that we're idle since the session could be doing
1270   // many things concurrently.
1271   return LOAD_STATE_IDLE;
1272 }
1273
1274 void SpdySession::CloseActiveStreamIterator(ActiveStreamMap::iterator it,
1275                                             int status) {
1276   // TODO(mbelshe): We should send a RST_STREAM control frame here
1277   //                so that the server can cancel a large send.
1278
1279   scoped_ptr<SpdyStream> owned_stream(it->second.stream);
1280   active_streams_.erase(it);
1281
1282   // TODO(akalin): When SpdyStream was ref-counted (and
1283   // |unclaimed_pushed_streams_| held scoped_refptr<SpdyStream>), this
1284   // was only done when status was not OK. This meant that pushed
1285   // streams can still be claimed after they're closed. This is
1286   // probably something that we still want to support, although server
1287   // push is hardly used. Write tests for this and fix this. (See
1288   // http://crbug.com/261712 .)
1289   if (owned_stream->type() == SPDY_PUSH_STREAM) {
1290     unclaimed_pushed_streams_.erase(owned_stream->url());
1291     num_pushed_streams_--;
1292     if (!owned_stream->IsReservedRemote())
1293       num_active_pushed_streams_--;
1294   }
1295
1296   DeleteStream(owned_stream.Pass(), status);
1297   MaybeFinishGoingAway();
1298
1299   // If there are no active streams and the socket pool is stalled, close the
1300   // session to free up a socket slot.
1301   if (active_streams_.empty() && connection_->IsPoolStalled()) {
1302     DoDrainSession(ERR_CONNECTION_CLOSED, "Closing idle connection.");
1303   }
1304 }
1305
1306 void SpdySession::CloseCreatedStreamIterator(CreatedStreamSet::iterator it,
1307                                              int status) {
1308   scoped_ptr<SpdyStream> owned_stream(*it);
1309   created_streams_.erase(it);
1310   DeleteStream(owned_stream.Pass(), status);
1311 }
1312
1313 void SpdySession::ResetStreamIterator(ActiveStreamMap::iterator it,
1314                                       SpdyRstStreamStatus status,
1315                                       const std::string& description) {
1316   // Send the RST_STREAM frame first as CloseActiveStreamIterator()
1317   // may close us.
1318   SpdyStreamId stream_id = it->first;
1319   RequestPriority priority = it->second.stream->priority();
1320   EnqueueResetStreamFrame(stream_id, priority, status, description);
1321
1322   // Removes any pending writes for the stream except for possibly an
1323   // in-flight one.
1324   CloseActiveStreamIterator(it, ERR_SPDY_PROTOCOL_ERROR);
1325 }
1326
1327 void SpdySession::EnqueueResetStreamFrame(SpdyStreamId stream_id,
1328                                           RequestPriority priority,
1329                                           SpdyRstStreamStatus status,
1330                                           const std::string& description) {
1331   DCHECK_NE(stream_id, 0u);
1332
1333   net_log().AddEvent(
1334       NetLog::TYPE_HTTP2_SESSION_SEND_RST_STREAM,
1335       base::Bind(&NetLogSpdyRstCallback, stream_id, status, &description));
1336
1337   DCHECK(buffered_spdy_framer_.get());
1338   scoped_ptr<SpdyFrame> rst_frame(
1339       buffered_spdy_framer_->CreateRstStream(stream_id, status));
1340
1341   EnqueueSessionWrite(priority, RST_STREAM, rst_frame.Pass());
1342   RecordProtocolErrorHistogram(MapRstStreamStatusToProtocolError(status));
1343 }
1344
1345 void SpdySession::PumpReadLoop(ReadState expected_read_state, int result) {
1346   // TODO(pkasting): Remove ScopedTracker below once crbug.com/462774 is fixed.
1347   tracked_objects::ScopedTracker tracking_profile(
1348       FROM_HERE_WITH_EXPLICIT_FUNCTION("462774 SpdySession::PumpReadLoop"));
1349
1350   CHECK(!in_io_loop_);
1351   if (availability_state_ == STATE_DRAINING) {
1352     return;
1353   }
1354   ignore_result(DoReadLoop(expected_read_state, result));
1355 }
1356
1357 int SpdySession::DoReadLoop(ReadState expected_read_state, int result) {
1358   CHECK(!in_io_loop_);
1359   CHECK_EQ(read_state_, expected_read_state);
1360
1361   in_io_loop_ = true;
1362
1363   int bytes_read_without_yielding = 0;
1364
1365   // Loop until the session is draining, the read becomes blocked, or
1366   // the read limit is exceeded.
1367   while (true) {
1368     switch (read_state_) {
1369       case READ_STATE_DO_READ:
1370         CHECK_EQ(result, OK);
1371         result = DoRead();
1372         break;
1373       case READ_STATE_DO_READ_COMPLETE:
1374         if (result > 0)
1375           bytes_read_without_yielding += result;
1376         result = DoReadComplete(result);
1377         break;
1378       default:
1379         NOTREACHED() << "read_state_: " << read_state_;
1380         break;
1381     }
1382
1383     if (availability_state_ == STATE_DRAINING)
1384       break;
1385
1386     if (result == ERR_IO_PENDING)
1387       break;
1388
1389     if (bytes_read_without_yielding > kMaxReadBytesWithoutYielding) {
1390       read_state_ = READ_STATE_DO_READ;
1391       base::MessageLoop::current()->PostTask(
1392           FROM_HERE,
1393           base::Bind(&SpdySession::PumpReadLoop,
1394                      weak_factory_.GetWeakPtr(), READ_STATE_DO_READ, OK));
1395       result = ERR_IO_PENDING;
1396       break;
1397     }
1398   }
1399
1400   CHECK(in_io_loop_);
1401   in_io_loop_ = false;
1402
1403   return result;
1404 }
1405
1406 int SpdySession::DoRead() {
1407   CHECK(in_io_loop_);
1408
1409   CHECK(connection_);
1410   CHECK(connection_->socket());
1411   read_state_ = READ_STATE_DO_READ_COMPLETE;
1412   return connection_->socket()->Read(
1413       read_buffer_.get(),
1414       kReadBufferSize,
1415       base::Bind(&SpdySession::PumpReadLoop,
1416                  weak_factory_.GetWeakPtr(), READ_STATE_DO_READ_COMPLETE));
1417 }
1418
1419 int SpdySession::DoReadComplete(int result) {
1420   CHECK(in_io_loop_);
1421
1422   // Parse a frame.  For now this code requires that the frame fit into our
1423   // buffer (kReadBufferSize).
1424   // TODO(mbelshe): support arbitrarily large frames!
1425
1426   if (result == 0) {
1427     UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySession.BytesRead.EOF",
1428                                 total_bytes_received_, 1, 100000000, 50);
1429     DoDrainSession(ERR_CONNECTION_CLOSED, "Connection closed");
1430
1431     return ERR_CONNECTION_CLOSED;
1432   }
1433
1434   if (result < 0) {
1435     DoDrainSession(static_cast<Error>(result), "result is < 0.");
1436     return result;
1437   }
1438   CHECK_LE(result, kReadBufferSize);
1439   total_bytes_received_ += result;
1440
1441   last_activity_time_ = time_func_();
1442
1443   DCHECK(buffered_spdy_framer_.get());
1444   char* data = read_buffer_->data();
1445   while (result > 0) {
1446     uint32 bytes_processed = buffered_spdy_framer_->ProcessInput(data, result);
1447     result -= bytes_processed;
1448     data += bytes_processed;
1449
1450     if (availability_state_ == STATE_DRAINING) {
1451       return ERR_CONNECTION_CLOSED;
1452     }
1453
1454     DCHECK_EQ(buffered_spdy_framer_->error_code(), SpdyFramer::SPDY_NO_ERROR);
1455   }
1456
1457   read_state_ = READ_STATE_DO_READ;
1458   return OK;
1459 }
1460
1461 void SpdySession::PumpWriteLoop(WriteState expected_write_state, int result) {
1462   CHECK(!in_io_loop_);
1463   DCHECK_EQ(write_state_, expected_write_state);
1464
1465   DoWriteLoop(expected_write_state, result);
1466
1467   if (availability_state_ == STATE_DRAINING && !in_flight_write_ &&
1468       write_queue_.IsEmpty()) {
1469     pool_->RemoveUnavailableSession(GetWeakPtr());  // Destroys |this|.
1470     return;
1471   }
1472 }
1473
1474 int SpdySession::DoWriteLoop(WriteState expected_write_state, int result) {
1475   CHECK(!in_io_loop_);
1476   DCHECK_NE(write_state_, WRITE_STATE_IDLE);
1477   DCHECK_EQ(write_state_, expected_write_state);
1478
1479   in_io_loop_ = true;
1480
1481   // Loop until the session is closed or the write becomes blocked.
1482   while (true) {
1483     switch (write_state_) {
1484       case WRITE_STATE_DO_WRITE:
1485         DCHECK_EQ(result, OK);
1486         result = DoWrite();
1487         break;
1488       case WRITE_STATE_DO_WRITE_COMPLETE:
1489         result = DoWriteComplete(result);
1490         break;
1491       case WRITE_STATE_IDLE:
1492       default:
1493         NOTREACHED() << "write_state_: " << write_state_;
1494         break;
1495     }
1496
1497     if (write_state_ == WRITE_STATE_IDLE) {
1498       DCHECK_EQ(result, ERR_IO_PENDING);
1499       break;
1500     }
1501
1502     if (result == ERR_IO_PENDING)
1503       break;
1504   }
1505
1506   CHECK(in_io_loop_);
1507   in_io_loop_ = false;
1508
1509   return result;
1510 }
1511
1512 int SpdySession::DoWrite() {
1513   CHECK(in_io_loop_);
1514
1515   DCHECK(buffered_spdy_framer_);
1516   if (in_flight_write_) {
1517     DCHECK_GT(in_flight_write_->GetRemainingSize(), 0u);
1518   } else {
1519     // Grab the next frame to send.
1520     SpdyFrameType frame_type = DATA;
1521     scoped_ptr<SpdyBufferProducer> producer;
1522     base::WeakPtr<SpdyStream> stream;
1523     if (!write_queue_.Dequeue(&frame_type, &producer, &stream)) {
1524       write_state_ = WRITE_STATE_IDLE;
1525       return ERR_IO_PENDING;
1526     }
1527
1528     if (stream.get())
1529       CHECK(!stream->IsClosed());
1530
1531     // Activate the stream only when sending the SYN_STREAM frame to
1532     // guarantee monotonically-increasing stream IDs.
1533     if (frame_type == SYN_STREAM) {
1534       CHECK(stream.get());
1535       CHECK_EQ(stream->stream_id(), 0u);
1536       scoped_ptr<SpdyStream> owned_stream =
1537           ActivateCreatedStream(stream.get());
1538       InsertActivatedStream(owned_stream.Pass());
1539
1540       if (stream_hi_water_mark_ > kLastStreamId) {
1541         CHECK_EQ(stream->stream_id(), kLastStreamId);
1542         // We've exhausted the stream ID space, and no new streams may be
1543         // created after this one.
1544         MakeUnavailable();
1545         StartGoingAway(kLastStreamId, ERR_ABORTED);
1546       }
1547     }
1548
1549     // TODO(pkasting): Remove ScopedTracker below once crbug.com/457517 is
1550     // fixed.
1551     tracked_objects::ScopedTracker tracking_profile1(
1552         FROM_HERE_WITH_EXPLICIT_FUNCTION("457517 SpdySession::DoWrite1"));
1553     in_flight_write_ = producer->ProduceBuffer();
1554     if (!in_flight_write_) {
1555       NOTREACHED();
1556       return ERR_UNEXPECTED;
1557     }
1558     in_flight_write_frame_type_ = frame_type;
1559     in_flight_write_frame_size_ = in_flight_write_->GetRemainingSize();
1560     DCHECK_GE(in_flight_write_frame_size_,
1561               buffered_spdy_framer_->GetFrameMinimumSize());
1562     in_flight_write_stream_ = stream;
1563   }
1564
1565   write_state_ = WRITE_STATE_DO_WRITE_COMPLETE;
1566
1567   // Explicitly store in a scoped_refptr<IOBuffer> to avoid problems
1568   // with Socket implementations that don't store their IOBuffer
1569   // argument in a scoped_refptr<IOBuffer> (see crbug.com/232345).
1570   // TODO(pkasting): Remove ScopedTracker below once crbug.com/457517 is fixed.
1571   tracked_objects::ScopedTracker tracking_profile2(
1572       FROM_HERE_WITH_EXPLICIT_FUNCTION("457517 SpdySession::DoWrite2"));
1573   scoped_refptr<IOBuffer> write_io_buffer =
1574       in_flight_write_->GetIOBufferForRemainingData();
1575   return connection_->socket()->Write(
1576       write_io_buffer.get(),
1577       in_flight_write_->GetRemainingSize(),
1578       base::Bind(&SpdySession::PumpWriteLoop,
1579                  weak_factory_.GetWeakPtr(), WRITE_STATE_DO_WRITE_COMPLETE));
1580 }
1581
1582 int SpdySession::DoWriteComplete(int result) {
1583   CHECK(in_io_loop_);
1584   DCHECK_NE(result, ERR_IO_PENDING);
1585   DCHECK_GT(in_flight_write_->GetRemainingSize(), 0u);
1586
1587   last_activity_time_ = time_func_();
1588
1589   if (result < 0) {
1590     DCHECK_NE(result, ERR_IO_PENDING);
1591     in_flight_write_.reset();
1592     in_flight_write_frame_type_ = DATA;
1593     in_flight_write_frame_size_ = 0;
1594     in_flight_write_stream_.reset();
1595     write_state_ = WRITE_STATE_DO_WRITE;
1596     DoDrainSession(static_cast<Error>(result), "Write error");
1597     return OK;
1598   }
1599
1600   // It should not be possible to have written more bytes than our
1601   // in_flight_write_.
1602   DCHECK_LE(static_cast<size_t>(result),
1603             in_flight_write_->GetRemainingSize());
1604
1605   if (result > 0) {
1606     in_flight_write_->Consume(static_cast<size_t>(result));
1607
1608     // We only notify the stream when we've fully written the pending frame.
1609     if (in_flight_write_->GetRemainingSize() == 0) {
1610       // It is possible that the stream was cancelled while we were
1611       // writing to the socket.
1612       if (in_flight_write_stream_.get()) {
1613         DCHECK_GT(in_flight_write_frame_size_, 0u);
1614         in_flight_write_stream_->OnFrameWriteComplete(
1615             in_flight_write_frame_type_,
1616             in_flight_write_frame_size_);
1617       }
1618
1619       // Cleanup the write which just completed.
1620       in_flight_write_.reset();
1621       in_flight_write_frame_type_ = DATA;
1622       in_flight_write_frame_size_ = 0;
1623       in_flight_write_stream_.reset();
1624     }
1625   }
1626
1627   write_state_ = WRITE_STATE_DO_WRITE;
1628   return OK;
1629 }
1630
1631 void SpdySession::DcheckGoingAway() const {
1632 #if DCHECK_IS_ON()
1633   DCHECK_GE(availability_state_, STATE_GOING_AWAY);
1634   for (int i = MINIMUM_PRIORITY; i <= MAXIMUM_PRIORITY; ++i) {
1635     DCHECK(pending_create_stream_queues_[i].empty());
1636   }
1637   DCHECK(created_streams_.empty());
1638 #endif
1639 }
1640
1641 void SpdySession::DcheckDraining() const {
1642   DcheckGoingAway();
1643   DCHECK_EQ(availability_state_, STATE_DRAINING);
1644   DCHECK(active_streams_.empty());
1645   DCHECK(unclaimed_pushed_streams_.empty());
1646 }
1647
1648 void SpdySession::StartGoingAway(SpdyStreamId last_good_stream_id,
1649                                  Error status) {
1650   DCHECK_GE(availability_state_, STATE_GOING_AWAY);
1651
1652   // The loops below are carefully written to avoid reentrancy problems.
1653
1654   while (true) {
1655     size_t old_size = GetTotalSize(pending_create_stream_queues_);
1656     base::WeakPtr<SpdyStreamRequest> pending_request =
1657         GetNextPendingStreamRequest();
1658     if (!pending_request)
1659       break;
1660     // No new stream requests should be added while the session is
1661     // going away.
1662     DCHECK_GT(old_size, GetTotalSize(pending_create_stream_queues_));
1663     pending_request->OnRequestCompleteFailure(ERR_ABORTED);
1664   }
1665
1666   while (true) {
1667     size_t old_size = active_streams_.size();
1668     ActiveStreamMap::iterator it =
1669         active_streams_.lower_bound(last_good_stream_id + 1);
1670     if (it == active_streams_.end())
1671       break;
1672     LogAbandonedActiveStream(it, status);
1673     CloseActiveStreamIterator(it, status);
1674     // No new streams should be activated while the session is going
1675     // away.
1676     DCHECK_GT(old_size, active_streams_.size());
1677   }
1678
1679   while (!created_streams_.empty()) {
1680     size_t old_size = created_streams_.size();
1681     CreatedStreamSet::iterator it = created_streams_.begin();
1682     LogAbandonedStream(*it, status);
1683     CloseCreatedStreamIterator(it, status);
1684     // No new streams should be created while the session is going
1685     // away.
1686     DCHECK_GT(old_size, created_streams_.size());
1687   }
1688
1689   write_queue_.RemovePendingWritesForStreamsAfter(last_good_stream_id);
1690
1691   DcheckGoingAway();
1692 }
1693
1694 void SpdySession::MaybeFinishGoingAway() {
1695   if (active_streams_.empty() && availability_state_ == STATE_GOING_AWAY) {
1696     DoDrainSession(OK, "Finished going away");
1697   }
1698 }
1699
1700 void SpdySession::DoDrainSession(Error err, const std::string& description) {
1701   if (availability_state_ == STATE_DRAINING) {
1702     return;
1703   }
1704   MakeUnavailable();
1705
1706   // Mark host_port_pair requiring HTTP/1.1 for subsequent connections.
1707   if (err == ERR_HTTP_1_1_REQUIRED) {
1708     http_server_properties_->SetHTTP11Required(host_port_pair());
1709   }
1710
1711   // If |err| indicates an error occurred, inform the peer that we're closing
1712   // and why. Don't GOAWAY on a graceful or idle close, as that may
1713   // unnecessarily wake the radio. We could technically GOAWAY on network errors
1714   // (we'll probably fail to actually write it, but that's okay), however many
1715   // unit-tests would need to be updated.
1716   if (err != OK &&
1717       err != ERR_ABORTED &&  // Used by SpdySessionPool to close idle sessions.
1718       err != ERR_NETWORK_CHANGED &&  // Used to deprecate sessions on IP change.
1719       err != ERR_SOCKET_NOT_CONNECTED && err != ERR_HTTP_1_1_REQUIRED &&
1720       err != ERR_CONNECTION_CLOSED && err != ERR_CONNECTION_RESET) {
1721     // Enqueue a GOAWAY to inform the peer of why we're closing the connection.
1722     SpdyGoAwayIR goaway_ir(last_accepted_push_stream_id_,
1723                            MapNetErrorToGoAwayStatus(err),
1724                            description);
1725     EnqueueSessionWrite(HIGHEST,
1726                         GOAWAY,
1727                         scoped_ptr<SpdyFrame>(
1728                             buffered_spdy_framer_->SerializeFrame(goaway_ir)));
1729   }
1730
1731   availability_state_ = STATE_DRAINING;
1732   error_on_close_ = err;
1733
1734   net_log_.AddEvent(
1735       NetLog::TYPE_HTTP2_SESSION_CLOSE,
1736       base::Bind(&NetLogSpdySessionCloseCallback, err, &description));
1737
1738   UMA_HISTOGRAM_SPARSE_SLOWLY("Net.SpdySession.ClosedOnError", -err);
1739   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySession.BytesRead.OtherErrors",
1740                               total_bytes_received_, 1, 100000000, 50);
1741
1742   if (err == OK) {
1743     // We ought to be going away already, as this is a graceful close.
1744     DcheckGoingAway();
1745   } else {
1746     StartGoingAway(0, err);
1747   }
1748   DcheckDraining();
1749   MaybePostWriteLoop();
1750 }
1751
1752 void SpdySession::LogAbandonedStream(SpdyStream* stream, Error status) {
1753   DCHECK(stream);
1754   std::string description = base::StringPrintf(
1755       "ABANDONED (stream_id=%d): ", stream->stream_id()) +
1756       stream->url().spec();
1757   stream->LogStreamError(status, description);
1758   // We don't increment the streams abandoned counter here. If the
1759   // stream isn't active (i.e., it hasn't written anything to the wire
1760   // yet) then it's as if it never existed. If it is active, then
1761   // LogAbandonedActiveStream() will increment the counters.
1762 }
1763
1764 void SpdySession::LogAbandonedActiveStream(ActiveStreamMap::const_iterator it,
1765                                            Error status) {
1766   DCHECK_GT(it->first, 0u);
1767   LogAbandonedStream(it->second.stream, status);
1768   ++streams_abandoned_count_;
1769   if (it->second.stream->type() == SPDY_PUSH_STREAM &&
1770       unclaimed_pushed_streams_.find(it->second.stream->url()) !=
1771       unclaimed_pushed_streams_.end()) {
1772   }
1773 }
1774
1775 SpdyStreamId SpdySession::GetNewStreamId() {
1776   CHECK_LE(stream_hi_water_mark_, kLastStreamId);
1777   SpdyStreamId id = stream_hi_water_mark_;
1778   stream_hi_water_mark_ += 2;
1779   return id;
1780 }
1781
1782 void SpdySession::CloseSessionOnError(Error err,
1783                                       const std::string& description) {
1784   DCHECK_LT(err, ERR_IO_PENDING);
1785   DoDrainSession(err, description);
1786 }
1787
1788 void SpdySession::MakeUnavailable() {
1789   if (availability_state_ == STATE_AVAILABLE) {
1790     availability_state_ = STATE_GOING_AWAY;
1791     pool_->MakeSessionUnavailable(GetWeakPtr());
1792   }
1793 }
1794
1795 base::Value* SpdySession::GetInfoAsValue() const {
1796   base::DictionaryValue* dict = new base::DictionaryValue();
1797
1798   dict->SetInteger("source_id", net_log_.source().id);
1799
1800   dict->SetString("host_port_pair", host_port_pair().ToString());
1801   if (!pooled_aliases_.empty()) {
1802     base::ListValue* alias_list = new base::ListValue();
1803     for (std::set<SpdySessionKey>::const_iterator it =
1804              pooled_aliases_.begin();
1805          it != pooled_aliases_.end(); it++) {
1806       alias_list->Append(new base::StringValue(
1807           it->host_port_pair().ToString()));
1808     }
1809     dict->Set("aliases", alias_list);
1810   }
1811   dict->SetString("proxy", host_port_proxy_pair().second.ToURI());
1812
1813   dict->SetInteger("active_streams", active_streams_.size());
1814
1815   dict->SetInteger("unclaimed_pushed_streams",
1816                    unclaimed_pushed_streams_.size());
1817
1818   dict->SetBoolean("is_secure", is_secure_);
1819
1820   dict->SetString("protocol_negotiated",
1821                   SSLClientSocket::NextProtoToString(
1822                       connection_->socket()->GetNegotiatedProtocol()));
1823
1824   dict->SetInteger("error", error_on_close_);
1825   dict->SetInteger("max_concurrent_streams", max_concurrent_streams_);
1826
1827   dict->SetInteger("streams_initiated_count", streams_initiated_count_);
1828   dict->SetInteger("streams_pushed_count", streams_pushed_count_);
1829   dict->SetInteger("streams_pushed_and_claimed_count",
1830       streams_pushed_and_claimed_count_);
1831   dict->SetInteger("streams_abandoned_count", streams_abandoned_count_);
1832   DCHECK(buffered_spdy_framer_.get());
1833   dict->SetInteger("frames_received", buffered_spdy_framer_->frames_received());
1834
1835   dict->SetBoolean("sent_settings", sent_settings_);
1836   dict->SetBoolean("received_settings", received_settings_);
1837
1838   dict->SetInteger("send_window_size", session_send_window_size_);
1839   dict->SetInteger("recv_window_size", session_recv_window_size_);
1840   dict->SetInteger("unacked_recv_window_bytes",
1841                    session_unacked_recv_window_bytes_);
1842   return dict;
1843 }
1844
1845 bool SpdySession::IsReused() const {
1846   return buffered_spdy_framer_->frames_received() > 0 ||
1847       connection_->reuse_type() == ClientSocketHandle::UNUSED_IDLE;
1848 }
1849
1850 bool SpdySession::GetLoadTimingInfo(SpdyStreamId stream_id,
1851                                     LoadTimingInfo* load_timing_info) const {
1852   return connection_->GetLoadTimingInfo(stream_id != kFirstStreamId,
1853                                         load_timing_info);
1854 }
1855
1856 int SpdySession::GetPeerAddress(IPEndPoint* address) const {
1857   int rv = ERR_SOCKET_NOT_CONNECTED;
1858   if (connection_->socket()) {
1859     rv = connection_->socket()->GetPeerAddress(address);
1860   }
1861
1862   UMA_HISTOGRAM_BOOLEAN("Net.SpdySessionSocketNotConnectedGetPeerAddress",
1863                         rv == ERR_SOCKET_NOT_CONNECTED);
1864
1865   return rv;
1866 }
1867
1868 int SpdySession::GetLocalAddress(IPEndPoint* address) const {
1869   int rv = ERR_SOCKET_NOT_CONNECTED;
1870   if (connection_->socket()) {
1871     rv = connection_->socket()->GetLocalAddress(address);
1872   }
1873
1874   UMA_HISTOGRAM_BOOLEAN("Net.SpdySessionSocketNotConnectedGetLocalAddress",
1875                         rv == ERR_SOCKET_NOT_CONNECTED);
1876
1877   return rv;
1878 }
1879
1880 void SpdySession::EnqueueSessionWrite(RequestPriority priority,
1881                                       SpdyFrameType frame_type,
1882                                       scoped_ptr<SpdyFrame> frame) {
1883   DCHECK(frame_type == RST_STREAM || frame_type == SETTINGS ||
1884          frame_type == WINDOW_UPDATE || frame_type == PING ||
1885          frame_type == GOAWAY);
1886   EnqueueWrite(
1887       priority, frame_type,
1888       scoped_ptr<SpdyBufferProducer>(
1889           new SimpleBufferProducer(
1890               scoped_ptr<SpdyBuffer>(new SpdyBuffer(frame.Pass())))),
1891       base::WeakPtr<SpdyStream>());
1892 }
1893
1894 void SpdySession::EnqueueWrite(RequestPriority priority,
1895                                SpdyFrameType frame_type,
1896                                scoped_ptr<SpdyBufferProducer> producer,
1897                                const base::WeakPtr<SpdyStream>& stream) {
1898   if (availability_state_ == STATE_DRAINING)
1899     return;
1900
1901   write_queue_.Enqueue(priority, frame_type, producer.Pass(), stream);
1902   MaybePostWriteLoop();
1903 }
1904
1905 void SpdySession::MaybePostWriteLoop() {
1906   if (write_state_ == WRITE_STATE_IDLE) {
1907     CHECK(!in_flight_write_);
1908     write_state_ = WRITE_STATE_DO_WRITE;
1909     base::MessageLoop::current()->PostTask(
1910         FROM_HERE,
1911         base::Bind(&SpdySession::PumpWriteLoop,
1912                    weak_factory_.GetWeakPtr(), WRITE_STATE_DO_WRITE, OK));
1913   }
1914 }
1915
1916 void SpdySession::InsertCreatedStream(scoped_ptr<SpdyStream> stream) {
1917   CHECK_EQ(stream->stream_id(), 0u);
1918   CHECK(created_streams_.find(stream.get()) == created_streams_.end());
1919   created_streams_.insert(stream.release());
1920 }
1921
1922 scoped_ptr<SpdyStream> SpdySession::ActivateCreatedStream(SpdyStream* stream) {
1923   CHECK_EQ(stream->stream_id(), 0u);
1924   CHECK(created_streams_.find(stream) != created_streams_.end());
1925   stream->set_stream_id(GetNewStreamId());
1926   scoped_ptr<SpdyStream> owned_stream(stream);
1927   created_streams_.erase(stream);
1928   return owned_stream.Pass();
1929 }
1930
1931 void SpdySession::InsertActivatedStream(scoped_ptr<SpdyStream> stream) {
1932   SpdyStreamId stream_id = stream->stream_id();
1933   CHECK_NE(stream_id, 0u);
1934   std::pair<ActiveStreamMap::iterator, bool> result =
1935       active_streams_.insert(
1936           std::make_pair(stream_id, ActiveStreamInfo(stream.get())));
1937   CHECK(result.second);
1938   ignore_result(stream.release());
1939 }
1940
1941 void SpdySession::DeleteStream(scoped_ptr<SpdyStream> stream, int status) {
1942   if (in_flight_write_stream_.get() == stream.get()) {
1943     // If we're deleting the stream for the in-flight write, we still
1944     // need to let the write complete, so we clear
1945     // |in_flight_write_stream_| and let the write finish on its own
1946     // without notifying |in_flight_write_stream_|.
1947     in_flight_write_stream_.reset();
1948   }
1949
1950   write_queue_.RemovePendingWritesForStream(stream->GetWeakPtr());
1951   stream->OnClose(status);
1952
1953   if (availability_state_ == STATE_AVAILABLE) {
1954     ProcessPendingStreamRequests();
1955   }
1956 }
1957
1958 base::WeakPtr<SpdyStream> SpdySession::GetActivePushStream(const GURL& url) {
1959   PushedStreamMap::iterator unclaimed_it = unclaimed_pushed_streams_.find(url);
1960   if (unclaimed_it == unclaimed_pushed_streams_.end())
1961     return base::WeakPtr<SpdyStream>();
1962
1963   SpdyStreamId stream_id = unclaimed_it->second.stream_id;
1964   unclaimed_pushed_streams_.erase(unclaimed_it);
1965
1966   ActiveStreamMap::iterator active_it = active_streams_.find(stream_id);
1967   if (active_it == active_streams_.end()) {
1968     NOTREACHED();
1969     return base::WeakPtr<SpdyStream>();
1970   }
1971
1972   net_log_.AddEvent(NetLog::TYPE_HTTP2_STREAM_ADOPTED_PUSH_STREAM,
1973                     base::Bind(&NetLogSpdyAdoptedPushStreamCallback,
1974                                active_it->second.stream->stream_id(), &url));
1975   return active_it->second.stream->GetWeakPtr();
1976 }
1977
1978 bool SpdySession::GetSSLInfo(SSLInfo* ssl_info,
1979                              bool* was_npn_negotiated,
1980                              NextProto* protocol_negotiated) {
1981   *was_npn_negotiated = connection_->socket()->WasNpnNegotiated();
1982   *protocol_negotiated = connection_->socket()->GetNegotiatedProtocol();
1983   return connection_->socket()->GetSSLInfo(ssl_info);
1984 }
1985
1986 bool SpdySession::GetSSLCertRequestInfo(
1987     SSLCertRequestInfo* cert_request_info) {
1988   if (!is_secure_)
1989     return false;
1990   GetSSLClientSocket()->GetSSLCertRequestInfo(cert_request_info);
1991   return true;
1992 }
1993
1994 void SpdySession::OnError(SpdyFramer::SpdyError error_code) {
1995   CHECK(in_io_loop_);
1996
1997   RecordProtocolErrorHistogram(MapFramerErrorToProtocolError(error_code));
1998   std::string description =
1999       base::StringPrintf("Framer error: %d (%s).",
2000                          error_code,
2001                          SpdyFramer::ErrorCodeToString(error_code));
2002   DoDrainSession(MapFramerErrorToNetError(error_code), description);
2003 }
2004
2005 void SpdySession::OnStreamError(SpdyStreamId stream_id,
2006                                 const std::string& description) {
2007   CHECK(in_io_loop_);
2008
2009   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2010   if (it == active_streams_.end()) {
2011     // We still want to send a frame to reset the stream even if we
2012     // don't know anything about it.
2013     EnqueueResetStreamFrame(
2014         stream_id, IDLE, RST_STREAM_PROTOCOL_ERROR, description);
2015     return;
2016   }
2017
2018   ResetStreamIterator(it, RST_STREAM_PROTOCOL_ERROR, description);
2019 }
2020
2021 void SpdySession::OnDataFrameHeader(SpdyStreamId stream_id,
2022                                     size_t length,
2023                                     bool fin) {
2024   CHECK(in_io_loop_);
2025
2026   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2027
2028   // By the time data comes in, the stream may already be inactive.
2029   if (it == active_streams_.end())
2030     return;
2031
2032   SpdyStream* stream = it->second.stream;
2033   CHECK_EQ(stream->stream_id(), stream_id);
2034
2035   DCHECK(buffered_spdy_framer_);
2036   size_t header_len = buffered_spdy_framer_->GetDataFrameMinimumSize();
2037   stream->IncrementRawReceivedBytes(header_len);
2038 }
2039
2040 void SpdySession::OnStreamFrameData(SpdyStreamId stream_id,
2041                                     const char* data,
2042                                     size_t len,
2043                                     bool fin) {
2044   CHECK(in_io_loop_);
2045   DCHECK_LT(len, 1u << 24);
2046   if (net_log().IsLogging()) {
2047     net_log().AddEvent(
2048         NetLog::TYPE_HTTP2_SESSION_RECV_DATA,
2049         base::Bind(&NetLogSpdyDataCallback, stream_id, len, fin));
2050   }
2051
2052   // Build the buffer as early as possible so that we go through the
2053   // session flow control checks and update
2054   // |unacked_recv_window_bytes_| properly even when the stream is
2055   // inactive (since the other side has still reduced its session send
2056   // window).
2057   scoped_ptr<SpdyBuffer> buffer;
2058   if (data) {
2059     DCHECK_GT(len, 0u);
2060     CHECK_LE(len, static_cast<size_t>(kReadBufferSize));
2061     buffer.reset(new SpdyBuffer(data, len));
2062
2063     if (flow_control_state_ == FLOW_CONTROL_STREAM_AND_SESSION) {
2064       DecreaseRecvWindowSize(static_cast<int32>(len));
2065       buffer->AddConsumeCallback(
2066           base::Bind(&SpdySession::OnReadBufferConsumed,
2067                      weak_factory_.GetWeakPtr()));
2068     }
2069   } else {
2070     DCHECK_EQ(len, 0u);
2071   }
2072
2073   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2074
2075   // By the time data comes in, the stream may already be inactive.
2076   if (it == active_streams_.end())
2077     return;
2078
2079   SpdyStream* stream = it->second.stream;
2080   CHECK_EQ(stream->stream_id(), stream_id);
2081
2082   stream->IncrementRawReceivedBytes(len);
2083
2084   if (it->second.waiting_for_syn_reply) {
2085     const std::string& error = "Data received before SYN_REPLY.";
2086     stream->LogStreamError(ERR_SPDY_PROTOCOL_ERROR, error);
2087     ResetStreamIterator(it, RST_STREAM_PROTOCOL_ERROR, error);
2088     return;
2089   }
2090
2091   stream->OnDataReceived(buffer.Pass());
2092 }
2093
2094 void SpdySession::OnStreamPadding(SpdyStreamId stream_id, size_t len) {
2095   CHECK(in_io_loop_);
2096
2097   if (flow_control_state_ != FLOW_CONTROL_STREAM_AND_SESSION)
2098     return;
2099
2100   // Decrease window size because padding bytes are received.
2101   // Increase window size because padding bytes are consumed (by discarding).
2102   // Net result: |session_unacked_recv_window_bytes_| increases by |len|,
2103   // |session_recv_window_size_| does not change.
2104   DecreaseRecvWindowSize(static_cast<int32>(len));
2105   IncreaseRecvWindowSize(static_cast<int32>(len));
2106
2107   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2108   if (it == active_streams_.end())
2109     return;
2110   it->second.stream->OnPaddingConsumed(len);
2111 }
2112
2113 void SpdySession::OnSettings(bool clear_persisted) {
2114   CHECK(in_io_loop_);
2115
2116   if (clear_persisted)
2117     http_server_properties_->ClearSpdySettings(host_port_pair());
2118
2119   if (net_log_.IsLogging()) {
2120     net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_RECV_SETTINGS,
2121                       base::Bind(&NetLogSpdySettingsCallback, host_port_pair(),
2122                                  clear_persisted));
2123   }
2124
2125   if (GetProtocolVersion() >= SPDY4) {
2126     // Send an acknowledgment of the setting.
2127     SpdySettingsIR settings_ir;
2128     settings_ir.set_is_ack(true);
2129     EnqueueSessionWrite(
2130         HIGHEST,
2131         SETTINGS,
2132         scoped_ptr<SpdyFrame>(
2133             buffered_spdy_framer_->SerializeFrame(settings_ir)));
2134   }
2135 }
2136
2137 void SpdySession::OnSetting(SpdySettingsIds id,
2138                             uint8 flags,
2139                             uint32 value) {
2140   CHECK(in_io_loop_);
2141
2142   HandleSetting(id, value);
2143   http_server_properties_->SetSpdySetting(
2144       host_port_pair(),
2145       id,
2146       static_cast<SpdySettingsFlags>(flags),
2147       value);
2148   received_settings_ = true;
2149
2150   // Log the setting.
2151   const SpdyMajorVersion protocol_version = GetProtocolVersion();
2152   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_RECV_SETTING,
2153                     base::Bind(&NetLogSpdySettingCallback, id, protocol_version,
2154                                static_cast<SpdySettingsFlags>(flags), value));
2155 }
2156
2157 void SpdySession::OnSendCompressedFrame(
2158     SpdyStreamId stream_id,
2159     SpdyFrameType type,
2160     size_t payload_len,
2161     size_t frame_len) {
2162   if (type != SYN_STREAM && type != HEADERS)
2163     return;
2164
2165   DCHECK(buffered_spdy_framer_.get());
2166   size_t compressed_len =
2167       frame_len - buffered_spdy_framer_->GetSynStreamMinimumSize();
2168
2169   if (payload_len) {
2170     // Make sure we avoid early decimal truncation.
2171     int compression_pct = 100 - (100 * compressed_len) / payload_len;
2172     UMA_HISTOGRAM_PERCENTAGE("Net.SpdySynStreamCompressionPercentage",
2173                              compression_pct);
2174   }
2175 }
2176
2177 void SpdySession::OnReceiveCompressedFrame(
2178     SpdyStreamId stream_id,
2179     SpdyFrameType type,
2180     size_t frame_len) {
2181   last_compressed_frame_len_ = frame_len;
2182 }
2183
2184 int SpdySession::OnInitialResponseHeadersReceived(
2185     const SpdyHeaderBlock& response_headers,
2186     base::Time response_time,
2187     base::TimeTicks recv_first_byte_time,
2188     SpdyStream* stream) {
2189   CHECK(in_io_loop_);
2190   SpdyStreamId stream_id = stream->stream_id();
2191
2192   if (stream->type() == SPDY_PUSH_STREAM) {
2193     DCHECK(stream->IsReservedRemote());
2194     if (max_concurrent_pushed_streams_ &&
2195         num_active_pushed_streams_ >= max_concurrent_pushed_streams_) {
2196       ResetStream(stream_id,
2197                   RST_STREAM_REFUSED_STREAM,
2198                   "Stream concurrency limit reached.");
2199       return STATUS_CODE_REFUSED_STREAM;
2200     }
2201   }
2202
2203   if (stream->type() == SPDY_PUSH_STREAM) {
2204     // Will be balanced in DeleteStream.
2205     num_active_pushed_streams_++;
2206   }
2207
2208   // May invalidate |stream|.
2209   int rv = stream->OnInitialResponseHeadersReceived(
2210       response_headers, response_time, recv_first_byte_time);
2211   if (rv < 0) {
2212     DCHECK_NE(rv, ERR_IO_PENDING);
2213     DCHECK(active_streams_.find(stream_id) == active_streams_.end());
2214   }
2215
2216   return rv;
2217 }
2218
2219 void SpdySession::OnSynStream(SpdyStreamId stream_id,
2220                               SpdyStreamId associated_stream_id,
2221                               SpdyPriority priority,
2222                               bool fin,
2223                               bool unidirectional,
2224                               const SpdyHeaderBlock& headers) {
2225   CHECK(in_io_loop_);
2226
2227   DCHECK_LE(GetProtocolVersion(), SPDY3);
2228
2229   base::Time response_time = base::Time::Now();
2230   base::TimeTicks recv_first_byte_time = time_func_();
2231
2232   if (net_log_.IsLogging()) {
2233     net_log_.AddEvent(
2234         NetLog::TYPE_HTTP2_SESSION_PUSHED_SYN_STREAM,
2235         base::Bind(&NetLogSpdySynStreamReceivedCallback, &headers, fin,
2236                    unidirectional, priority, stream_id, associated_stream_id));
2237   }
2238
2239   // Split headers to simulate push promise and response.
2240   SpdyHeaderBlock request_headers;
2241   SpdyHeaderBlock response_headers;
2242   SplitPushedHeadersToRequestAndResponse(
2243       headers, GetProtocolVersion(), &request_headers, &response_headers);
2244
2245   if (!TryCreatePushStream(
2246           stream_id, associated_stream_id, priority, request_headers))
2247     return;
2248
2249   ActiveStreamMap::iterator active_it = active_streams_.find(stream_id);
2250   if (active_it == active_streams_.end()) {
2251     NOTREACHED();
2252     return;
2253   }
2254
2255   OnInitialResponseHeadersReceived(response_headers, response_time,
2256                                    recv_first_byte_time,
2257                                    active_it->second.stream);
2258 }
2259
2260 void SpdySession::DeleteExpiredPushedStreams() {
2261   if (unclaimed_pushed_streams_.empty())
2262     return;
2263
2264   // Check that adequate time has elapsed since the last sweep.
2265   if (time_func_() < next_unclaimed_push_stream_sweep_time_)
2266     return;
2267
2268   // Gather old streams to delete.
2269   base::TimeTicks minimum_freshness = time_func_() -
2270       base::TimeDelta::FromSeconds(kMinPushedStreamLifetimeSeconds);
2271   std::vector<SpdyStreamId> streams_to_close;
2272   for (PushedStreamMap::iterator it = unclaimed_pushed_streams_.begin();
2273        it != unclaimed_pushed_streams_.end(); ++it) {
2274     if (minimum_freshness > it->second.creation_time)
2275       streams_to_close.push_back(it->second.stream_id);
2276   }
2277
2278   for (std::vector<SpdyStreamId>::const_iterator to_close_it =
2279            streams_to_close.begin();
2280        to_close_it != streams_to_close.end(); ++to_close_it) {
2281     ActiveStreamMap::iterator active_it = active_streams_.find(*to_close_it);
2282     if (active_it == active_streams_.end())
2283       continue;
2284
2285     LogAbandonedActiveStream(active_it, ERR_INVALID_SPDY_STREAM);
2286     // CloseActiveStreamIterator() will remove the stream from
2287     // |unclaimed_pushed_streams_|.
2288     ResetStreamIterator(
2289         active_it, RST_STREAM_REFUSED_STREAM, "Stream not claimed.");
2290   }
2291
2292   next_unclaimed_push_stream_sweep_time_ = time_func_() +
2293       base::TimeDelta::FromSeconds(kMinPushedStreamLifetimeSeconds);
2294 }
2295
2296 void SpdySession::OnSynReply(SpdyStreamId stream_id,
2297                              bool fin,
2298                              const SpdyHeaderBlock& headers) {
2299   CHECK(in_io_loop_);
2300
2301   base::Time response_time = base::Time::Now();
2302   base::TimeTicks recv_first_byte_time = time_func_();
2303
2304   if (net_log().IsLogging()) {
2305     net_log().AddEvent(NetLog::TYPE_HTTP2_SESSION_SYN_REPLY,
2306                        base::Bind(&NetLogSpdySynReplyOrHeadersReceivedCallback,
2307                                   &headers, fin, stream_id));
2308   }
2309
2310   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2311   if (it == active_streams_.end()) {
2312     // NOTE:  it may just be that the stream was cancelled.
2313     return;
2314   }
2315
2316   SpdyStream* stream = it->second.stream;
2317   CHECK_EQ(stream->stream_id(), stream_id);
2318
2319   stream->IncrementRawReceivedBytes(last_compressed_frame_len_);
2320   last_compressed_frame_len_ = 0;
2321
2322   if (GetProtocolVersion() >= SPDY4) {
2323     const std::string& error =
2324         "SPDY4 wasn't expecting SYN_REPLY.";
2325     stream->LogStreamError(ERR_SPDY_PROTOCOL_ERROR, error);
2326     ResetStreamIterator(it, RST_STREAM_PROTOCOL_ERROR, error);
2327     return;
2328   }
2329   if (!it->second.waiting_for_syn_reply) {
2330     const std::string& error =
2331         "Received duplicate SYN_REPLY for stream.";
2332     stream->LogStreamError(ERR_SPDY_PROTOCOL_ERROR, error);
2333     ResetStreamIterator(it, RST_STREAM_PROTOCOL_ERROR, error);
2334     return;
2335   }
2336   it->second.waiting_for_syn_reply = false;
2337
2338   ignore_result(OnInitialResponseHeadersReceived(
2339       headers, response_time, recv_first_byte_time, stream));
2340 }
2341
2342 void SpdySession::OnHeaders(SpdyStreamId stream_id,
2343                             bool has_priority,
2344                             SpdyPriority priority,
2345                             bool fin,
2346                             const SpdyHeaderBlock& headers) {
2347   CHECK(in_io_loop_);
2348
2349   if (net_log().IsLogging()) {
2350     net_log().AddEvent(NetLog::TYPE_HTTP2_SESSION_RECV_HEADERS,
2351                        base::Bind(&NetLogSpdySynReplyOrHeadersReceivedCallback,
2352                                   &headers, fin, stream_id));
2353   }
2354
2355   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2356   if (it == active_streams_.end()) {
2357     // NOTE:  it may just be that the stream was cancelled.
2358     LOG(WARNING) << "Received HEADERS for invalid stream " << stream_id;
2359     return;
2360   }
2361
2362   SpdyStream* stream = it->second.stream;
2363   CHECK_EQ(stream->stream_id(), stream_id);
2364
2365   stream->IncrementRawReceivedBytes(last_compressed_frame_len_);
2366   last_compressed_frame_len_ = 0;
2367
2368   base::Time response_time = base::Time::Now();
2369   base::TimeTicks recv_first_byte_time = time_func_();
2370
2371   if (it->second.waiting_for_syn_reply) {
2372     if (GetProtocolVersion() < SPDY4) {
2373       const std::string& error =
2374           "Was expecting SYN_REPLY, not HEADERS.";
2375       stream->LogStreamError(ERR_SPDY_PROTOCOL_ERROR, error);
2376       ResetStreamIterator(it, RST_STREAM_PROTOCOL_ERROR, error);
2377       return;
2378     }
2379
2380     it->second.waiting_for_syn_reply = false;
2381     ignore_result(OnInitialResponseHeadersReceived(
2382         headers, response_time, recv_first_byte_time, stream));
2383   } else if (it->second.stream->IsReservedRemote()) {
2384     ignore_result(OnInitialResponseHeadersReceived(
2385         headers, response_time, recv_first_byte_time, stream));
2386   } else {
2387     int rv = stream->OnAdditionalResponseHeadersReceived(headers);
2388     if (rv < 0) {
2389       DCHECK_NE(rv, ERR_IO_PENDING);
2390       DCHECK(active_streams_.find(stream_id) == active_streams_.end());
2391     }
2392   }
2393 }
2394
2395 bool SpdySession::OnUnknownFrame(SpdyStreamId stream_id, int frame_type) {
2396   // Validate stream id.
2397   // Was the frame sent on a stream id that has not been used in this session?
2398   if (stream_id % 2 == 1 && stream_id > stream_hi_water_mark_)
2399     return false;
2400
2401   if (stream_id % 2 == 0 && stream_id > last_accepted_push_stream_id_)
2402     return false;
2403
2404   return true;
2405 }
2406
2407 void SpdySession::OnRstStream(SpdyStreamId stream_id,
2408                               SpdyRstStreamStatus status) {
2409   CHECK(in_io_loop_);
2410
2411   std::string description;
2412   net_log().AddEvent(
2413       NetLog::TYPE_HTTP2_SESSION_RST_STREAM,
2414       base::Bind(&NetLogSpdyRstCallback, stream_id, status, &description));
2415
2416   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2417   if (it == active_streams_.end()) {
2418     // NOTE:  it may just be that the stream was cancelled.
2419     LOG(WARNING) << "Received RST for invalid stream" << stream_id;
2420     return;
2421   }
2422
2423   CHECK_EQ(it->second.stream->stream_id(), stream_id);
2424
2425   if (status == 0) {
2426     it->second.stream->OnDataReceived(scoped_ptr<SpdyBuffer>());
2427   } else if (status == RST_STREAM_REFUSED_STREAM) {
2428     CloseActiveStreamIterator(it, ERR_SPDY_SERVER_REFUSED_STREAM);
2429   } else if (status == RST_STREAM_HTTP_1_1_REQUIRED) {
2430     // TODO(bnc): Record histogram with number of open streams capped at 50.
2431     it->second.stream->LogStreamError(
2432         ERR_HTTP_1_1_REQUIRED,
2433         base::StringPrintf(
2434             "SPDY session closed because of stream with status: %d", status));
2435     DoDrainSession(ERR_HTTP_1_1_REQUIRED, "HTTP_1_1_REQUIRED for stream.");
2436   } else {
2437     RecordProtocolErrorHistogram(
2438         PROTOCOL_ERROR_RST_STREAM_FOR_NON_ACTIVE_STREAM);
2439     it->second.stream->LogStreamError(
2440         ERR_SPDY_PROTOCOL_ERROR,
2441         base::StringPrintf("SPDY stream closed with status: %d", status));
2442     // TODO(mbelshe): Map from Spdy-protocol errors to something sensical.
2443     //                For now, it doesn't matter much - it is a protocol error.
2444     CloseActiveStreamIterator(it, ERR_SPDY_PROTOCOL_ERROR);
2445   }
2446 }
2447
2448 void SpdySession::OnGoAway(SpdyStreamId last_accepted_stream_id,
2449                            SpdyGoAwayStatus status) {
2450   CHECK(in_io_loop_);
2451
2452   // TODO(jgraettinger): UMA histogram on |status|.
2453
2454   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_GOAWAY,
2455                     base::Bind(&NetLogSpdyGoAwayCallback,
2456                                last_accepted_stream_id, active_streams_.size(),
2457                                unclaimed_pushed_streams_.size(), status));
2458   MakeUnavailable();
2459   if (status == GOAWAY_HTTP_1_1_REQUIRED) {
2460     // TODO(bnc): Record histogram with number of open streams capped at 50.
2461     DoDrainSession(ERR_HTTP_1_1_REQUIRED, "HTTP_1_1_REQUIRED for stream.");
2462   } else {
2463     StartGoingAway(last_accepted_stream_id, ERR_ABORTED);
2464   }
2465   // This is to handle the case when we already don't have any active
2466   // streams (i.e., StartGoingAway() did nothing). Otherwise, we have
2467   // active streams and so the last one being closed will finish the
2468   // going away process (see DeleteStream()).
2469   MaybeFinishGoingAway();
2470 }
2471
2472 void SpdySession::OnPing(SpdyPingId unique_id, bool is_ack) {
2473   CHECK(in_io_loop_);
2474
2475   net_log_.AddEvent(
2476       NetLog::TYPE_HTTP2_SESSION_PING,
2477       base::Bind(&NetLogSpdyPingCallback, unique_id, is_ack, "received"));
2478
2479   // Send response to a PING from server.
2480   if ((protocol_ >= kProtoSPDY4MinimumVersion && !is_ack) ||
2481       (protocol_ < kProtoSPDY4MinimumVersion && unique_id % 2 == 0)) {
2482     WritePingFrame(unique_id, true);
2483     return;
2484   }
2485
2486   --pings_in_flight_;
2487   if (pings_in_flight_ < 0) {
2488     RecordProtocolErrorHistogram(PROTOCOL_ERROR_UNEXPECTED_PING);
2489     DoDrainSession(ERR_SPDY_PROTOCOL_ERROR, "pings_in_flight_ is < 0.");
2490     pings_in_flight_ = 0;
2491     return;
2492   }
2493
2494   if (pings_in_flight_ > 0)
2495     return;
2496
2497   // We will record RTT in histogram when there are no more client sent
2498   // pings_in_flight_.
2499   RecordPingRTTHistogram(time_func_() - last_ping_sent_time_);
2500 }
2501
2502 void SpdySession::OnWindowUpdate(SpdyStreamId stream_id,
2503                                  uint32 delta_window_size) {
2504   CHECK(in_io_loop_);
2505
2506   DCHECK_LE(delta_window_size, static_cast<uint32>(kint32max));
2507   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_RECEIVED_WINDOW_UPDATE_FRAME,
2508                     base::Bind(&NetLogSpdyWindowUpdateFrameCallback, stream_id,
2509                                delta_window_size));
2510
2511   if (stream_id == kSessionFlowControlStreamId) {
2512     // WINDOW_UPDATE for the session.
2513     if (flow_control_state_ < FLOW_CONTROL_STREAM_AND_SESSION) {
2514       LOG(WARNING) << "Received WINDOW_UPDATE for session when "
2515                    << "session flow control is not turned on";
2516       // TODO(akalin): Record an error and close the session.
2517       return;
2518     }
2519
2520     if (delta_window_size < 1u) {
2521       RecordProtocolErrorHistogram(PROTOCOL_ERROR_INVALID_WINDOW_UPDATE_SIZE);
2522       DoDrainSession(
2523           ERR_SPDY_PROTOCOL_ERROR,
2524           "Received WINDOW_UPDATE with an invalid delta_window_size " +
2525               base::UintToString(delta_window_size));
2526       return;
2527     }
2528
2529     IncreaseSendWindowSize(static_cast<int32>(delta_window_size));
2530   } else {
2531     // WINDOW_UPDATE for a stream.
2532     if (flow_control_state_ < FLOW_CONTROL_STREAM) {
2533       // TODO(akalin): Record an error and close the session.
2534       LOG(WARNING) << "Received WINDOW_UPDATE for stream " << stream_id
2535                    << " when flow control is not turned on";
2536       return;
2537     }
2538
2539     ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2540
2541     if (it == active_streams_.end()) {
2542       // NOTE:  it may just be that the stream was cancelled.
2543       LOG(WARNING) << "Received WINDOW_UPDATE for invalid stream " << stream_id;
2544       return;
2545     }
2546
2547     SpdyStream* stream = it->second.stream;
2548     CHECK_EQ(stream->stream_id(), stream_id);
2549
2550     if (delta_window_size < 1u) {
2551       ResetStreamIterator(it,
2552                           RST_STREAM_FLOW_CONTROL_ERROR,
2553                           base::StringPrintf(
2554                               "Received WINDOW_UPDATE with an invalid "
2555                               "delta_window_size %ud", delta_window_size));
2556       return;
2557     }
2558
2559     CHECK_EQ(it->second.stream->stream_id(), stream_id);
2560     it->second.stream->IncreaseSendWindowSize(
2561         static_cast<int32>(delta_window_size));
2562   }
2563 }
2564
2565 bool SpdySession::TryCreatePushStream(SpdyStreamId stream_id,
2566                                       SpdyStreamId associated_stream_id,
2567                                       SpdyPriority priority,
2568                                       const SpdyHeaderBlock& headers) {
2569   // Server-initiated streams should have even sequence numbers.
2570   if ((stream_id & 0x1) != 0) {
2571     LOG(WARNING) << "Received invalid push stream id " << stream_id;
2572     if (GetProtocolVersion() > SPDY2)
2573       CloseSessionOnError(ERR_SPDY_PROTOCOL_ERROR, "Odd push stream id.");
2574     return false;
2575   }
2576
2577   if (GetProtocolVersion() > SPDY2) {
2578     if (stream_id <= last_accepted_push_stream_id_) {
2579       LOG(WARNING) << "Received push stream id lesser or equal to the last "
2580                    << "accepted before " << stream_id;
2581       CloseSessionOnError(
2582           ERR_SPDY_PROTOCOL_ERROR,
2583           "New push stream id must be greater than the last accepted.");
2584       return false;
2585     }
2586   }
2587
2588   if (IsStreamActive(stream_id)) {
2589     // For SPDY3 and higher we should not get here, we'll start going away
2590     // earlier on |last_seen_push_stream_id_| check.
2591     CHECK_GT(SPDY3, GetProtocolVersion());
2592     LOG(WARNING) << "Received push for active stream " << stream_id;
2593     return false;
2594   }
2595
2596   last_accepted_push_stream_id_ = stream_id;
2597
2598   RequestPriority request_priority =
2599       ConvertSpdyPriorityToRequestPriority(priority, GetProtocolVersion());
2600
2601   if (availability_state_ == STATE_GOING_AWAY) {
2602     // TODO(akalin): This behavior isn't in the SPDY spec, although it
2603     // probably should be.
2604     EnqueueResetStreamFrame(stream_id,
2605                             request_priority,
2606                             RST_STREAM_REFUSED_STREAM,
2607                             "push stream request received when going away");
2608     return false;
2609   }
2610
2611   if (associated_stream_id == 0) {
2612     // In SPDY4 0 stream id in PUSH_PROMISE frame leads to framer error and
2613     // session going away. We should never get here.
2614     CHECK_GT(SPDY4, GetProtocolVersion());
2615     std::string description = base::StringPrintf(
2616         "Received invalid associated stream id %d for pushed stream %d",
2617         associated_stream_id,
2618         stream_id);
2619     EnqueueResetStreamFrame(
2620         stream_id, request_priority, RST_STREAM_REFUSED_STREAM, description);
2621     return false;
2622   }
2623
2624   streams_pushed_count_++;
2625
2626   // TODO(mbelshe): DCHECK that this is a GET method?
2627
2628   // Verify that the response had a URL for us.
2629   GURL gurl = GetUrlFromHeaderBlock(headers, GetProtocolVersion(), true);
2630   if (!gurl.is_valid()) {
2631     EnqueueResetStreamFrame(stream_id,
2632                             request_priority,
2633                             RST_STREAM_PROTOCOL_ERROR,
2634                             "Pushed stream url was invalid: " + gurl.spec());
2635     return false;
2636   }
2637
2638   // Verify we have a valid stream association.
2639   ActiveStreamMap::iterator associated_it =
2640       active_streams_.find(associated_stream_id);
2641   if (associated_it == active_streams_.end()) {
2642     EnqueueResetStreamFrame(
2643         stream_id,
2644         request_priority,
2645         RST_STREAM_INVALID_STREAM,
2646         base::StringPrintf("Received push for inactive associated stream %d",
2647                            associated_stream_id));
2648     return false;
2649   }
2650
2651   // Check that the pushed stream advertises the same origin as its associated
2652   // stream. Bypass this check if and only if this session is with a SPDY proxy
2653   // that is trusted explicitly via the --trusted-spdy-proxy switch.
2654   if (trusted_spdy_proxy_.Equals(host_port_pair())) {
2655     // Disallow pushing of HTTPS content.
2656     if (gurl.SchemeIs("https")) {
2657       EnqueueResetStreamFrame(
2658           stream_id,
2659           request_priority,
2660           RST_STREAM_REFUSED_STREAM,
2661           base::StringPrintf("Rejected push of Cross Origin HTTPS content %d",
2662                              associated_stream_id));
2663     }
2664   } else {
2665     GURL associated_url(associated_it->second.stream->GetUrlFromHeaders());
2666     if (associated_url.GetOrigin() != gurl.GetOrigin()) {
2667       EnqueueResetStreamFrame(
2668           stream_id,
2669           request_priority,
2670           RST_STREAM_REFUSED_STREAM,
2671           base::StringPrintf("Rejected Cross Origin Push Stream %d",
2672                              associated_stream_id));
2673       return false;
2674     }
2675   }
2676
2677   // There should not be an existing pushed stream with the same path.
2678   PushedStreamMap::iterator pushed_it =
2679       unclaimed_pushed_streams_.lower_bound(gurl);
2680   if (pushed_it != unclaimed_pushed_streams_.end() &&
2681       pushed_it->first == gurl) {
2682     EnqueueResetStreamFrame(
2683         stream_id,
2684         request_priority,
2685         RST_STREAM_PROTOCOL_ERROR,
2686         "Received duplicate pushed stream with url: " + gurl.spec());
2687     return false;
2688   }
2689
2690   scoped_ptr<SpdyStream> stream(new SpdyStream(SPDY_PUSH_STREAM,
2691                                                GetWeakPtr(),
2692                                                gurl,
2693                                                request_priority,
2694                                                stream_initial_send_window_size_,
2695                                                stream_initial_recv_window_size_,
2696                                                net_log_));
2697   stream->set_stream_id(stream_id);
2698
2699   // In spdy4/http2 PUSH_PROMISE arrives on associated stream.
2700   if (associated_it != active_streams_.end() && GetProtocolVersion() >= SPDY4) {
2701     associated_it->second.stream->IncrementRawReceivedBytes(
2702         last_compressed_frame_len_);
2703   } else {
2704     stream->IncrementRawReceivedBytes(last_compressed_frame_len_);
2705   }
2706
2707   last_compressed_frame_len_ = 0;
2708
2709   PushedStreamMap::iterator inserted_pushed_it =
2710       unclaimed_pushed_streams_.insert(
2711           pushed_it,
2712           std::make_pair(gurl, PushedStreamInfo(stream_id, time_func_())));
2713   DCHECK(inserted_pushed_it != pushed_it);
2714   DeleteExpiredPushedStreams();
2715
2716   InsertActivatedStream(stream.Pass());
2717
2718   ActiveStreamMap::iterator active_it = active_streams_.find(stream_id);
2719   if (active_it == active_streams_.end()) {
2720     NOTREACHED();
2721     return false;
2722   }
2723
2724   active_it->second.stream->OnPushPromiseHeadersReceived(headers);
2725   DCHECK(active_it->second.stream->IsReservedRemote());
2726   num_pushed_streams_++;
2727   return true;
2728 }
2729
2730 void SpdySession::OnPushPromise(SpdyStreamId stream_id,
2731                                 SpdyStreamId promised_stream_id,
2732                                 const SpdyHeaderBlock& headers) {
2733   CHECK(in_io_loop_);
2734
2735   if (net_log_.IsLogging()) {
2736     net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_RECV_PUSH_PROMISE,
2737                       base::Bind(&NetLogSpdyPushPromiseReceivedCallback,
2738                                  &headers, stream_id, promised_stream_id));
2739   }
2740
2741   // Any priority will do.
2742   // TODO(baranovich): pass parent stream id priority?
2743   if (!TryCreatePushStream(promised_stream_id, stream_id, 0, headers))
2744     return;
2745 }
2746
2747 void SpdySession::SendStreamWindowUpdate(SpdyStreamId stream_id,
2748                                          uint32 delta_window_size) {
2749   CHECK_GE(flow_control_state_, FLOW_CONTROL_STREAM);
2750   ActiveStreamMap::const_iterator it = active_streams_.find(stream_id);
2751   CHECK(it != active_streams_.end());
2752   CHECK_EQ(it->second.stream->stream_id(), stream_id);
2753   SendWindowUpdateFrame(
2754       stream_id, delta_window_size, it->second.stream->priority());
2755 }
2756
2757 void SpdySession::SendInitialData() {
2758   DCHECK(enable_sending_initial_data_);
2759
2760   if (send_connection_header_prefix_) {
2761     DCHECK_GE(protocol_, kProtoSPDY4MinimumVersion);
2762     DCHECK_LE(protocol_, kProtoSPDY4MaximumVersion);
2763     scoped_ptr<SpdyFrame> connection_header_prefix_frame(
2764         new SpdyFrame(const_cast<char*>(kHttp2ConnectionHeaderPrefix),
2765                       kHttp2ConnectionHeaderPrefixSize,
2766                       false /* take_ownership */));
2767     // Count the prefix as part of the subsequent SETTINGS frame.
2768     EnqueueSessionWrite(HIGHEST, SETTINGS,
2769                         connection_header_prefix_frame.Pass());
2770   }
2771
2772   // First, notify the server about the settings they should use when
2773   // communicating with us.
2774   SettingsMap settings_map;
2775   // Create a new settings frame notifying the server of our
2776   // max concurrent streams and initial window size.
2777   settings_map[SETTINGS_MAX_CONCURRENT_STREAMS] =
2778       SettingsFlagsAndValue(SETTINGS_FLAG_NONE, kMaxConcurrentPushedStreams);
2779   if (flow_control_state_ >= FLOW_CONTROL_STREAM &&
2780       stream_initial_recv_window_size_ != GetInitialWindowSize(protocol_)) {
2781     settings_map[SETTINGS_INITIAL_WINDOW_SIZE] =
2782         SettingsFlagsAndValue(SETTINGS_FLAG_NONE,
2783                               stream_initial_recv_window_size_);
2784   }
2785   SendSettings(settings_map);
2786
2787   // Next, notify the server about our initial recv window size.
2788   if (flow_control_state_ == FLOW_CONTROL_STREAM_AND_SESSION) {
2789     // Bump up the receive window size to the real initial value. This
2790     // has to go here since the WINDOW_UPDATE frame sent by
2791     // IncreaseRecvWindowSize() call uses |buffered_spdy_framer_|.
2792     DCHECK_GT(kDefaultInitialRecvWindowSize, session_recv_window_size_);
2793     // This condition implies that |kDefaultInitialRecvWindowSize| -
2794     // |session_recv_window_size_| doesn't overflow.
2795     DCHECK_GT(session_recv_window_size_, 0);
2796     IncreaseRecvWindowSize(
2797         kDefaultInitialRecvWindowSize - session_recv_window_size_);
2798   }
2799
2800   if (protocol_ <= kProtoSPDY31) {
2801     // Finally, notify the server about the settings they have
2802     // previously told us to use when communicating with them (after
2803     // applying them).
2804     const SettingsMap& server_settings_map =
2805         http_server_properties_->GetSpdySettings(host_port_pair());
2806     if (server_settings_map.empty())
2807       return;
2808
2809     SettingsMap::const_iterator it =
2810         server_settings_map.find(SETTINGS_CURRENT_CWND);
2811     uint32 cwnd = (it != server_settings_map.end()) ? it->second.second : 0;
2812     UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwndSent", cwnd, 1, 200, 100);
2813
2814     for (SettingsMap::const_iterator it = server_settings_map.begin();
2815          it != server_settings_map.end(); ++it) {
2816       const SpdySettingsIds new_id = it->first;
2817       const uint32 new_val = it->second.second;
2818       HandleSetting(new_id, new_val);
2819     }
2820
2821     SendSettings(server_settings_map);
2822   }
2823 }
2824
2825
2826 void SpdySession::SendSettings(const SettingsMap& settings) {
2827   const SpdyMajorVersion protocol_version = GetProtocolVersion();
2828   net_log_.AddEvent(
2829       NetLog::TYPE_HTTP2_SESSION_SEND_SETTINGS,
2830       base::Bind(&NetLogSpdySendSettingsCallback, &settings, protocol_version));
2831   // Create the SETTINGS frame and send it.
2832   DCHECK(buffered_spdy_framer_.get());
2833   scoped_ptr<SpdyFrame> settings_frame(
2834       buffered_spdy_framer_->CreateSettings(settings));
2835   sent_settings_ = true;
2836   EnqueueSessionWrite(HIGHEST, SETTINGS, settings_frame.Pass());
2837 }
2838
2839 void SpdySession::HandleSetting(uint32 id, uint32 value) {
2840   switch (id) {
2841     case SETTINGS_MAX_CONCURRENT_STREAMS:
2842       max_concurrent_streams_ = std::min(static_cast<size_t>(value),
2843                                          kMaxConcurrentStreamLimit);
2844       ProcessPendingStreamRequests();
2845       break;
2846     case SETTINGS_INITIAL_WINDOW_SIZE: {
2847       if (flow_control_state_ < FLOW_CONTROL_STREAM) {
2848         net_log().AddEvent(
2849             NetLog::TYPE_HTTP2_SESSION_INITIAL_WINDOW_SIZE_NO_FLOW_CONTROL);
2850         return;
2851       }
2852
2853       if (value > static_cast<uint32>(kint32max)) {
2854         net_log().AddEvent(
2855             NetLog::TYPE_HTTP2_SESSION_INITIAL_WINDOW_SIZE_OUT_OF_RANGE,
2856             NetLog::IntegerCallback("initial_window_size", value));
2857         return;
2858       }
2859
2860       // SETTINGS_INITIAL_WINDOW_SIZE updates initial_send_window_size_ only.
2861       int32 delta_window_size =
2862           static_cast<int32>(value) - stream_initial_send_window_size_;
2863       stream_initial_send_window_size_ = static_cast<int32>(value);
2864       UpdateStreamsSendWindowSize(delta_window_size);
2865       net_log().AddEvent(
2866           NetLog::TYPE_HTTP2_SESSION_UPDATE_STREAMS_SEND_WINDOW_SIZE,
2867           NetLog::IntegerCallback("delta_window_size", delta_window_size));
2868       break;
2869     }
2870   }
2871 }
2872
2873 void SpdySession::UpdateStreamsSendWindowSize(int32 delta_window_size) {
2874   DCHECK_GE(flow_control_state_, FLOW_CONTROL_STREAM);
2875   for (ActiveStreamMap::iterator it = active_streams_.begin();
2876        it != active_streams_.end(); ++it) {
2877     it->second.stream->AdjustSendWindowSize(delta_window_size);
2878   }
2879
2880   for (CreatedStreamSet::const_iterator it = created_streams_.begin();
2881        it != created_streams_.end(); it++) {
2882     (*it)->AdjustSendWindowSize(delta_window_size);
2883   }
2884 }
2885
2886 void SpdySession::SendPrefacePingIfNoneInFlight() {
2887   if (pings_in_flight_ || !enable_ping_based_connection_checking_)
2888     return;
2889
2890   base::TimeTicks now = time_func_();
2891   // If there is no activity in the session, then send a preface-PING.
2892   if ((now - last_activity_time_) > connection_at_risk_of_loss_time_)
2893     SendPrefacePing();
2894 }
2895
2896 void SpdySession::SendPrefacePing() {
2897   WritePingFrame(next_ping_id_, false);
2898 }
2899
2900 void SpdySession::SendWindowUpdateFrame(SpdyStreamId stream_id,
2901                                         uint32 delta_window_size,
2902                                         RequestPriority priority) {
2903   CHECK_GE(flow_control_state_, FLOW_CONTROL_STREAM);
2904   ActiveStreamMap::const_iterator it = active_streams_.find(stream_id);
2905   if (it != active_streams_.end()) {
2906     CHECK_EQ(it->second.stream->stream_id(), stream_id);
2907   } else {
2908     CHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
2909     CHECK_EQ(stream_id, kSessionFlowControlStreamId);
2910   }
2911
2912   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_SENT_WINDOW_UPDATE_FRAME,
2913                     base::Bind(&NetLogSpdyWindowUpdateFrameCallback, stream_id,
2914                                delta_window_size));
2915
2916   DCHECK(buffered_spdy_framer_.get());
2917   scoped_ptr<SpdyFrame> window_update_frame(
2918       buffered_spdy_framer_->CreateWindowUpdate(stream_id, delta_window_size));
2919   EnqueueSessionWrite(priority, WINDOW_UPDATE, window_update_frame.Pass());
2920 }
2921
2922 void SpdySession::WritePingFrame(SpdyPingId unique_id, bool is_ack) {
2923   DCHECK(buffered_spdy_framer_.get());
2924   scoped_ptr<SpdyFrame> ping_frame(
2925       buffered_spdy_framer_->CreatePingFrame(unique_id, is_ack));
2926   EnqueueSessionWrite(HIGHEST, PING, ping_frame.Pass());
2927
2928   if (net_log().IsLogging()) {
2929     net_log().AddEvent(
2930         NetLog::TYPE_HTTP2_SESSION_PING,
2931         base::Bind(&NetLogSpdyPingCallback, unique_id, is_ack, "sent"));
2932   }
2933   if (!is_ack) {
2934     next_ping_id_ += 2;
2935     ++pings_in_flight_;
2936     PlanToCheckPingStatus();
2937     last_ping_sent_time_ = time_func_();
2938   }
2939 }
2940
2941 void SpdySession::PlanToCheckPingStatus() {
2942   if (check_ping_status_pending_)
2943     return;
2944
2945   check_ping_status_pending_ = true;
2946   base::MessageLoop::current()->PostDelayedTask(
2947       FROM_HERE,
2948       base::Bind(&SpdySession::CheckPingStatus, weak_factory_.GetWeakPtr(),
2949                  time_func_()), hung_interval_);
2950 }
2951
2952 void SpdySession::CheckPingStatus(base::TimeTicks last_check_time) {
2953   CHECK(!in_io_loop_);
2954
2955   // Check if we got a response back for all PINGs we had sent.
2956   if (pings_in_flight_ == 0) {
2957     check_ping_status_pending_ = false;
2958     return;
2959   }
2960
2961   DCHECK(check_ping_status_pending_);
2962
2963   base::TimeTicks now = time_func_();
2964   base::TimeDelta delay = hung_interval_ - (now - last_activity_time_);
2965
2966   if (delay.InMilliseconds() < 0 || last_activity_time_ < last_check_time) {
2967     // Track all failed PING messages in a separate bucket.
2968     RecordPingRTTHistogram(base::TimeDelta::Max());
2969     DoDrainSession(ERR_SPDY_PING_FAILED, "Failed ping.");
2970     return;
2971   }
2972
2973   // Check the status of connection after a delay.
2974   base::MessageLoop::current()->PostDelayedTask(
2975       FROM_HERE,
2976       base::Bind(&SpdySession::CheckPingStatus, weak_factory_.GetWeakPtr(),
2977                  now),
2978       delay);
2979 }
2980
2981 void SpdySession::RecordPingRTTHistogram(base::TimeDelta duration) {
2982   UMA_HISTOGRAM_TIMES("Net.SpdyPing.RTT", duration);
2983 }
2984
2985 void SpdySession::RecordProtocolErrorHistogram(
2986     SpdyProtocolErrorDetails details) {
2987   UMA_HISTOGRAM_ENUMERATION("Net.SpdySessionErrorDetails2", details,
2988                             NUM_SPDY_PROTOCOL_ERROR_DETAILS);
2989   if (EndsWith(host_port_pair().host(), "google.com", false)) {
2990     UMA_HISTOGRAM_ENUMERATION("Net.SpdySessionErrorDetails_Google2", details,
2991                               NUM_SPDY_PROTOCOL_ERROR_DETAILS);
2992   }
2993 }
2994
2995 void SpdySession::RecordHistograms() {
2996   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdyStreamsPerSession",
2997                               streams_initiated_count_,
2998                               0, 300, 50);
2999   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdyStreamsPushedPerSession",
3000                               streams_pushed_count_,
3001                               0, 300, 50);
3002   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdyStreamsPushedAndClaimedPerSession",
3003                               streams_pushed_and_claimed_count_,
3004                               0, 300, 50);
3005   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdyStreamsAbandonedPerSession",
3006                               streams_abandoned_count_,
3007                               0, 300, 50);
3008   UMA_HISTOGRAM_ENUMERATION("Net.SpdySettingsSent",
3009                             sent_settings_ ? 1 : 0, 2);
3010   UMA_HISTOGRAM_ENUMERATION("Net.SpdySettingsReceived",
3011                             received_settings_ ? 1 : 0, 2);
3012   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdyStreamStallsPerSession",
3013                               stalled_streams_,
3014                               0, 300, 50);
3015   UMA_HISTOGRAM_ENUMERATION("Net.SpdySessionsWithStalls",
3016                             stalled_streams_ > 0 ? 1 : 0, 2);
3017
3018   if (received_settings_) {
3019     // Enumerate the saved settings, and set histograms for it.
3020     const SettingsMap& settings_map =
3021         http_server_properties_->GetSpdySettings(host_port_pair());
3022
3023     SettingsMap::const_iterator it;
3024     for (it = settings_map.begin(); it != settings_map.end(); ++it) {
3025       const SpdySettingsIds id = it->first;
3026       const uint32 val = it->second.second;
3027       switch (id) {
3028         case SETTINGS_CURRENT_CWND:
3029           // Record several different histograms to see if cwnd converges
3030           // for larger volumes of data being sent.
3031           UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwnd",
3032                                       val, 1, 200, 100);
3033           if (total_bytes_received_ > 10 * 1024) {
3034             UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwnd10K",
3035                                         val, 1, 200, 100);
3036             if (total_bytes_received_ > 25 * 1024) {
3037               UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwnd25K",
3038                                           val, 1, 200, 100);
3039               if (total_bytes_received_ > 50 * 1024) {
3040                 UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwnd50K",
3041                                             val, 1, 200, 100);
3042                 if (total_bytes_received_ > 100 * 1024) {
3043                   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwnd100K",
3044                                               val, 1, 200, 100);
3045                 }
3046               }
3047             }
3048           }
3049           break;
3050         case SETTINGS_ROUND_TRIP_TIME:
3051           UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsRTT",
3052                                       val, 1, 1200, 100);
3053           break;
3054         case SETTINGS_DOWNLOAD_RETRANS_RATE:
3055           UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsRetransRate",
3056                                       val, 1, 100, 50);
3057           break;
3058         default:
3059           break;
3060       }
3061     }
3062   }
3063 }
3064
3065 void SpdySession::CompleteStreamRequest(
3066     const base::WeakPtr<SpdyStreamRequest>& pending_request) {
3067   // Abort if the request has already been cancelled.
3068   if (!pending_request)
3069     return;
3070
3071   base::WeakPtr<SpdyStream> stream;
3072   int rv = TryCreateStream(pending_request, &stream);
3073
3074   if (rv == OK) {
3075     DCHECK(stream);
3076     pending_request->OnRequestCompleteSuccess(stream);
3077     return;
3078   }
3079   DCHECK(!stream);
3080
3081   if (rv != ERR_IO_PENDING) {
3082     pending_request->OnRequestCompleteFailure(rv);
3083   }
3084 }
3085
3086 SSLClientSocket* SpdySession::GetSSLClientSocket() const {
3087   if (!is_secure_)
3088     return NULL;
3089   SSLClientSocket* ssl_socket =
3090       reinterpret_cast<SSLClientSocket*>(connection_->socket());
3091   DCHECK(ssl_socket);
3092   return ssl_socket;
3093 }
3094
3095 void SpdySession::OnWriteBufferConsumed(
3096     size_t frame_payload_size,
3097     size_t consume_size,
3098     SpdyBuffer::ConsumeSource consume_source) {
3099   // We can be called with |in_io_loop_| set if a write SpdyBuffer is
3100   // deleted (e.g., a stream is closed due to incoming data).
3101
3102   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3103
3104   if (consume_source == SpdyBuffer::DISCARD) {
3105     // If we're discarding a frame or part of it, increase the send
3106     // window by the number of discarded bytes. (Although if we're
3107     // discarding part of a frame, it's probably because of a write
3108     // error and we'll be tearing down the session soon.)
3109     size_t remaining_payload_bytes = std::min(consume_size, frame_payload_size);
3110     DCHECK_GT(remaining_payload_bytes, 0u);
3111     IncreaseSendWindowSize(static_cast<int32>(remaining_payload_bytes));
3112   }
3113   // For consumed bytes, the send window is increased when we receive
3114   // a WINDOW_UPDATE frame.
3115 }
3116
3117 void SpdySession::IncreaseSendWindowSize(int32 delta_window_size) {
3118   // We can be called with |in_io_loop_| set if a SpdyBuffer is
3119   // deleted (e.g., a stream is closed due to incoming data).
3120
3121   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3122   DCHECK_GE(delta_window_size, 1);
3123
3124   // Check for overflow.
3125   int32 max_delta_window_size = kint32max - session_send_window_size_;
3126   if (delta_window_size > max_delta_window_size) {
3127     RecordProtocolErrorHistogram(PROTOCOL_ERROR_INVALID_WINDOW_UPDATE_SIZE);
3128     DoDrainSession(
3129         ERR_SPDY_PROTOCOL_ERROR,
3130         "Received WINDOW_UPDATE [delta: " +
3131             base::IntToString(delta_window_size) +
3132             "] for session overflows session_send_window_size_ [current: " +
3133             base::IntToString(session_send_window_size_) + "]");
3134     return;
3135   }
3136
3137   session_send_window_size_ += delta_window_size;
3138
3139   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_UPDATE_SEND_WINDOW,
3140                     base::Bind(&NetLogSpdySessionWindowUpdateCallback,
3141                                delta_window_size, session_send_window_size_));
3142
3143   DCHECK(!IsSendStalled());
3144   ResumeSendStalledStreams();
3145 }
3146
3147 void SpdySession::DecreaseSendWindowSize(int32 delta_window_size) {
3148   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3149
3150   // We only call this method when sending a frame. Therefore,
3151   // |delta_window_size| should be within the valid frame size range.
3152   DCHECK_GE(delta_window_size, 1);
3153   DCHECK_LE(delta_window_size, kMaxSpdyFrameChunkSize);
3154
3155   // |send_window_size_| should have been at least |delta_window_size| for
3156   // this call to happen.
3157   DCHECK_GE(session_send_window_size_, delta_window_size);
3158
3159   session_send_window_size_ -= delta_window_size;
3160
3161   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_UPDATE_SEND_WINDOW,
3162                     base::Bind(&NetLogSpdySessionWindowUpdateCallback,
3163                                -delta_window_size, session_send_window_size_));
3164 }
3165
3166 void SpdySession::OnReadBufferConsumed(
3167     size_t consume_size,
3168     SpdyBuffer::ConsumeSource consume_source) {
3169   // We can be called with |in_io_loop_| set if a read SpdyBuffer is
3170   // deleted (e.g., discarded by a SpdyReadQueue).
3171
3172   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3173   DCHECK_GE(consume_size, 1u);
3174   DCHECK_LE(consume_size, static_cast<size_t>(kint32max));
3175
3176   IncreaseRecvWindowSize(static_cast<int32>(consume_size));
3177 }
3178
3179 void SpdySession::IncreaseRecvWindowSize(int32 delta_window_size) {
3180   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3181   DCHECK_GE(session_unacked_recv_window_bytes_, 0);
3182   DCHECK_GE(session_recv_window_size_, session_unacked_recv_window_bytes_);
3183   DCHECK_GE(delta_window_size, 1);
3184   // Check for overflow.
3185   DCHECK_LE(delta_window_size, kint32max - session_recv_window_size_);
3186
3187   session_recv_window_size_ += delta_window_size;
3188   net_log_.AddEvent(NetLog::TYPE_HTTP2_STREAM_UPDATE_RECV_WINDOW,
3189                     base::Bind(&NetLogSpdySessionWindowUpdateCallback,
3190                                delta_window_size, session_recv_window_size_));
3191
3192   session_unacked_recv_window_bytes_ += delta_window_size;
3193   if (session_unacked_recv_window_bytes_ >
3194       GetInitialWindowSize(protocol_) / 2) {
3195     SendWindowUpdateFrame(kSessionFlowControlStreamId,
3196                           session_unacked_recv_window_bytes_,
3197                           HIGHEST);
3198     session_unacked_recv_window_bytes_ = 0;
3199   }
3200 }
3201
3202 void SpdySession::DecreaseRecvWindowSize(int32 delta_window_size) {
3203   CHECK(in_io_loop_);
3204   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3205   DCHECK_GE(delta_window_size, 1);
3206
3207   // Since we never decrease the initial receive window size,
3208   // |delta_window_size| should never cause |recv_window_size_| to go
3209   // negative. If we do, the receive window isn't being respected.
3210   if (delta_window_size > session_recv_window_size_) {
3211     RecordProtocolErrorHistogram(PROTOCOL_ERROR_RECEIVE_WINDOW_VIOLATION);
3212     DoDrainSession(
3213         ERR_SPDY_FLOW_CONTROL_ERROR,
3214         "delta_window_size is " + base::IntToString(delta_window_size) +
3215             " in DecreaseRecvWindowSize, which is larger than the receive " +
3216             "window size of " + base::IntToString(session_recv_window_size_));
3217     return;
3218   }
3219
3220   session_recv_window_size_ -= delta_window_size;
3221   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_UPDATE_RECV_WINDOW,
3222                     base::Bind(&NetLogSpdySessionWindowUpdateCallback,
3223                                -delta_window_size, session_recv_window_size_));
3224 }
3225
3226 void SpdySession::QueueSendStalledStream(const SpdyStream& stream) {
3227   DCHECK(stream.send_stalled_by_flow_control());
3228   RequestPriority priority = stream.priority();
3229   CHECK_GE(priority, MINIMUM_PRIORITY);
3230   CHECK_LE(priority, MAXIMUM_PRIORITY);
3231   stream_send_unstall_queue_[priority].push_back(stream.stream_id());
3232 }
3233
3234 void SpdySession::ResumeSendStalledStreams() {
3235   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3236
3237   // We don't have to worry about new streams being queued, since
3238   // doing so would cause IsSendStalled() to return true. But we do
3239   // have to worry about streams being closed, as well as ourselves
3240   // being closed.
3241
3242   while (!IsSendStalled()) {
3243     size_t old_size = 0;
3244 #if DCHECK_IS_ON()
3245     old_size = GetTotalSize(stream_send_unstall_queue_);
3246 #endif
3247
3248     SpdyStreamId stream_id = PopStreamToPossiblyResume();
3249     if (stream_id == 0)
3250       break;
3251     ActiveStreamMap::const_iterator it = active_streams_.find(stream_id);
3252     // The stream may actually still be send-stalled after this (due
3253     // to its own send window) but that's okay -- it'll then be
3254     // resumed once its send window increases.
3255     if (it != active_streams_.end())
3256       it->second.stream->PossiblyResumeIfSendStalled();
3257
3258     // The size should decrease unless we got send-stalled again.
3259     if (!IsSendStalled())
3260       DCHECK_LT(GetTotalSize(stream_send_unstall_queue_), old_size);
3261   }
3262 }
3263
3264 SpdyStreamId SpdySession::PopStreamToPossiblyResume() {
3265   for (int i = MAXIMUM_PRIORITY; i >= MINIMUM_PRIORITY; --i) {
3266     std::deque<SpdyStreamId>* queue = &stream_send_unstall_queue_[i];
3267     if (!queue->empty()) {
3268       SpdyStreamId stream_id = queue->front();
3269       queue->pop_front();
3270       return stream_id;
3271     }
3272   }
3273   return 0;
3274 }
3275
3276 }  // namespace net