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_log.h"
  30 #include "net/base/net_util.h"
  31 #include "net/cert/asn1_util.h"
  32 #include "net/cert/cert_verify_result.h"
  33 #include "net/http/http_log_util.h"
  34 #include "net/http/http_network_session.h"
  35 #include "net/http/http_server_properties.h"
  36 #include "net/http/http_util.h"
  37 #include "net/http/transport_security_state.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   DCHECK(connection_->socket()->IsConnected());
 883   if (connection_->socket()) {
 884     UMA_HISTOGRAM_BOOLEAN("Net.SpdySession.CreateStreamWithSocketConnected",
 885                           connection_->socket()->IsConnected());
 886     if (!connection_->socket()->IsConnected()) {
 887       DoDrainSession(
 888           ERR_CONNECTION_CLOSED,
 889           "Tried to create SPDY stream for a closed socket connection.");
 890       return ERR_CONNECTION_CLOSED;
 891     }
 892   }
 893
 894   scoped_ptr<SpdyStream> new_stream(
 895       new SpdyStream(request.type(), GetWeakPtr(), request.url(),
 896                      request.priority(),
 897                      stream_initial_send_window_size_,
 898                      stream_initial_recv_window_size_,
 899                      request.net_log()));
 900   *stream = new_stream->GetWeakPtr();
 901   InsertCreatedStream(new_stream.Pass());
 902
 903   UMA_HISTOGRAM_CUSTOM_COUNTS(
 904       "Net.SpdyPriorityCount",
 905       static_cast<int>(request.priority()), 0, 10, 11);
 906
 907   return OK;
 908 }
 909
 910 void SpdySession::CancelStreamRequest(
 911     const base::WeakPtr<SpdyStreamRequest>& request) {
 912   DCHECK(request);
 913   RequestPriority priority = request->priority();
 914   CHECK_GE(priority, MINIMUM_PRIORITY);
 915   CHECK_LE(priority, MAXIMUM_PRIORITY);
 916
 917 #if DCHECK_IS_ON()
 918   // |request| should not be in a queue not matching its priority.
 919   for (int i = MINIMUM_PRIORITY; i <= MAXIMUM_PRIORITY; ++i) {
 920     if (priority == i)
 921       continue;
 922     PendingStreamRequestQueue* queue = &pending_create_stream_queues_[i];
 923     DCHECK(std::find_if(queue->begin(),
 924                         queue->end(),
 925                         RequestEquals(request)) == queue->end());
 926   }
 927 #endif
 928
 929   PendingStreamRequestQueue* queue =
 930       &pending_create_stream_queues_[priority];
 931   // Remove |request| from |queue| while preserving the order of the
 932   // other elements.
 933   PendingStreamRequestQueue::iterator it =
 934       std::find_if(queue->begin(), queue->end(), RequestEquals(request));
 935   // The request may already be removed if there's a
 936   // CompleteStreamRequest() in flight.
 937   if (it != queue->end()) {
 938     it = queue->erase(it);
 939     // |request| should be in the queue at most once, and if it is
 940     // present, should not be pending completion.
 941     DCHECK(std::find_if(it, queue->end(), RequestEquals(request)) ==
 942            queue->end());
 943   }
 944 }
 945
 946 base::WeakPtr<SpdyStreamRequest> SpdySession::GetNextPendingStreamRequest() {
 947   for (int j = MAXIMUM_PRIORITY; j >= MINIMUM_PRIORITY; --j) {
 948     if (pending_create_stream_queues_[j].empty())
 949       continue;
 950
 951     base::WeakPtr<SpdyStreamRequest> pending_request =
 952         pending_create_stream_queues_[j].front();
 953     DCHECK(pending_request);
 954     pending_create_stream_queues_[j].pop_front();
 955     return pending_request;
 956   }
 957   return base::WeakPtr<SpdyStreamRequest>();
 958 }
 959
 960 void SpdySession::ProcessPendingStreamRequests() {
 961   // Like |max_concurrent_streams_|, 0 means infinite for
 962   // |max_requests_to_process|.
 963   size_t max_requests_to_process = 0;
 964   if (max_concurrent_streams_ != 0) {
 965     max_requests_to_process =
 966         max_concurrent_streams_ -
 967         (active_streams_.size() + created_streams_.size());
 968   }
 969   for (size_t i = 0;
 970        max_requests_to_process == 0 || i < max_requests_to_process; ++i) {
 971     base::WeakPtr<SpdyStreamRequest> pending_request =
 972         GetNextPendingStreamRequest();
 973     if (!pending_request)
 974       break;
 975
 976     // Note that this post can race with other stream creations, and it's
 977     // possible that the un-stalled stream will be stalled again if it loses.
 978     // TODO(jgraettinger): Provide stronger ordering guarantees.
 979     base::MessageLoop::current()->PostTask(
 980         FROM_HERE,
 981         base::Bind(&SpdySession::CompleteStreamRequest,
 982                    weak_factory_.GetWeakPtr(),
 983                    pending_request));
 984   }
 985 }
 986
 987 void SpdySession::AddPooledAlias(const SpdySessionKey& alias_key) {
 988   pooled_aliases_.insert(alias_key);
 989 }
 990
 991 SpdyMajorVersion SpdySession::GetProtocolVersion() const {
 992   DCHECK(buffered_spdy_framer_.get());
 993   return buffered_spdy_framer_->protocol_version();
 994 }
 995
 996 bool SpdySession::HasAcceptableTransportSecurity() const {
 997   // If we're not even using TLS, we have no standards to meet.
 998   if (!is_secure_) {
 999     return true;
1000   }
1001
1002   // We don't enforce transport security standards for older SPDY versions.
1003   if (GetProtocolVersion() < SPDY4) {
1004     return true;
1005   }
1006
1007   SSLInfo ssl_info;
1008   CHECK(connection_->socket()->GetSSLInfo(&ssl_info));
1009
1010   // HTTP/2 requires TLS 1.2+
1011   if (SSLConnectionStatusToVersion(ssl_info.connection_status) <
1012       SSL_CONNECTION_VERSION_TLS1_2) {
1013     return false;
1014   }
1015
1016   if (!IsSecureTLSCipherSuite(
1017           SSLConnectionStatusToCipherSuite(ssl_info.connection_status))) {
1018     return false;
1019   }
1020
1021   return true;
1022 }
1023
1024 base::WeakPtr<SpdySession> SpdySession::GetWeakPtr() {
1025   return weak_factory_.GetWeakPtr();
1026 }
1027
1028 bool SpdySession::CloseOneIdleConnection() {
1029   CHECK(!in_io_loop_);
1030   DCHECK(pool_);
1031   if (active_streams_.empty()) {
1032     DoDrainSession(ERR_CONNECTION_CLOSED, "Closing idle connection.");
1033   }
1034   // Return false as the socket wasn't immediately closed.
1035   return false;
1036 }
1037
1038 void SpdySession::EnqueueStreamWrite(
1039     const base::WeakPtr<SpdyStream>& stream,
1040     SpdyFrameType frame_type,
1041     scoped_ptr<SpdyBufferProducer> producer) {
1042   DCHECK(frame_type == HEADERS ||
1043          frame_type == DATA ||
1044          frame_type == CREDENTIAL ||
1045          frame_type == SYN_STREAM);
1046   EnqueueWrite(stream->priority(), frame_type, producer.Pass(), stream);
1047 }
1048
1049 scoped_ptr<SpdyFrame> SpdySession::CreateSynStream(
1050     SpdyStreamId stream_id,
1051     RequestPriority priority,
1052     SpdyControlFlags flags,
1053     const SpdyHeaderBlock& block) {
1054   ActiveStreamMap::const_iterator it = active_streams_.find(stream_id);
1055   CHECK(it != active_streams_.end());
1056   CHECK_EQ(it->second.stream->stream_id(), stream_id);
1057
1058   SendPrefacePingIfNoneInFlight();
1059
1060   DCHECK(buffered_spdy_framer_.get());
1061   SpdyPriority spdy_priority =
1062       ConvertRequestPriorityToSpdyPriority(priority, GetProtocolVersion());
1063
1064   scoped_ptr<SpdyFrame> syn_frame;
1065   // TODO(hkhalil): Avoid copy of |block|.
1066   if (GetProtocolVersion() <= SPDY3) {
1067     SpdySynStreamIR syn_stream(stream_id);
1068     syn_stream.set_associated_to_stream_id(0);
1069     syn_stream.set_priority(spdy_priority);
1070     syn_stream.set_fin((flags & CONTROL_FLAG_FIN) != 0);
1071     syn_stream.set_unidirectional((flags & CONTROL_FLAG_UNIDIRECTIONAL) != 0);
1072     syn_stream.set_name_value_block(block);
1073     syn_frame.reset(buffered_spdy_framer_->SerializeFrame(syn_stream));
1074   } else {
1075     SpdyHeadersIR headers(stream_id);
1076     headers.set_priority(spdy_priority);
1077     headers.set_has_priority(true);
1078     headers.set_fin((flags & CONTROL_FLAG_FIN) != 0);
1079     headers.set_name_value_block(block);
1080     syn_frame.reset(buffered_spdy_framer_->SerializeFrame(headers));
1081   }
1082
1083   streams_initiated_count_++;
1084
1085   if (net_log().IsLogging()) {
1086     const NetLog::EventType type =
1087         (GetProtocolVersion() <= SPDY3)
1088             ? NetLog::TYPE_HTTP2_SESSION_SYN_STREAM
1089             : NetLog::TYPE_HTTP2_SESSION_SEND_HEADERS;
1090     net_log().AddEvent(type,
1091                        base::Bind(&NetLogSpdySynStreamSentCallback, &block,
1092                                   (flags & CONTROL_FLAG_FIN) != 0,
1093                                   (flags & CONTROL_FLAG_UNIDIRECTIONAL) != 0,
1094                                   spdy_priority, stream_id));
1095   }
1096
1097   return syn_frame.Pass();
1098 }
1099
1100 scoped_ptr<SpdyBuffer> SpdySession::CreateDataBuffer(SpdyStreamId stream_id,
1101                                                      IOBuffer* data,
1102                                                      int len,
1103                                                      SpdyDataFlags flags) {
1104   if (availability_state_ == STATE_DRAINING) {
1105     return scoped_ptr<SpdyBuffer>();
1106   }
1107
1108   ActiveStreamMap::const_iterator it = active_streams_.find(stream_id);
1109   CHECK(it != active_streams_.end());
1110   SpdyStream* stream = it->second.stream;
1111   CHECK_EQ(stream->stream_id(), stream_id);
1112
1113   if (len < 0) {
1114     NOTREACHED();
1115     return scoped_ptr<SpdyBuffer>();
1116   }
1117
1118   int effective_len = std::min(len, kMaxSpdyFrameChunkSize);
1119
1120   bool send_stalled_by_stream =
1121       (flow_control_state_ >= FLOW_CONTROL_STREAM) &&
1122       (stream->send_window_size() <= 0);
1123   bool send_stalled_by_session = IsSendStalled();
1124
1125   // NOTE: There's an enum of the same name in histograms.xml.
1126   enum SpdyFrameFlowControlState {
1127     SEND_NOT_STALLED,
1128     SEND_STALLED_BY_STREAM,
1129     SEND_STALLED_BY_SESSION,
1130     SEND_STALLED_BY_STREAM_AND_SESSION,
1131   };
1132
1133   SpdyFrameFlowControlState frame_flow_control_state = SEND_NOT_STALLED;
1134   if (send_stalled_by_stream) {
1135     if (send_stalled_by_session) {
1136       frame_flow_control_state = SEND_STALLED_BY_STREAM_AND_SESSION;
1137     } else {
1138       frame_flow_control_state = SEND_STALLED_BY_STREAM;
1139     }
1140   } else if (send_stalled_by_session) {
1141     frame_flow_control_state = SEND_STALLED_BY_SESSION;
1142   }
1143
1144   if (flow_control_state_ == FLOW_CONTROL_STREAM) {
1145     UMA_HISTOGRAM_ENUMERATION(
1146         "Net.SpdyFrameStreamFlowControlState",
1147         frame_flow_control_state,
1148         SEND_STALLED_BY_STREAM + 1);
1149   } else if (flow_control_state_ == FLOW_CONTROL_STREAM_AND_SESSION) {
1150     UMA_HISTOGRAM_ENUMERATION(
1151         "Net.SpdyFrameStreamAndSessionFlowControlState",
1152         frame_flow_control_state,
1153         SEND_STALLED_BY_STREAM_AND_SESSION + 1);
1154   }
1155
1156   // Obey send window size of the stream if stream flow control is
1157   // enabled.
1158   if (flow_control_state_ >= FLOW_CONTROL_STREAM) {
1159     if (send_stalled_by_stream) {
1160       stream->set_send_stalled_by_flow_control(true);
1161       // Even though we're currently stalled only by the stream, we
1162       // might end up being stalled by the session also.
1163       QueueSendStalledStream(*stream);
1164       net_log().AddEvent(
1165           NetLog::TYPE_HTTP2_SESSION_STREAM_STALLED_BY_STREAM_SEND_WINDOW,
1166           NetLog::IntegerCallback("stream_id", stream_id));
1167       return scoped_ptr<SpdyBuffer>();
1168     }
1169
1170     effective_len = std::min(effective_len, stream->send_window_size());
1171   }
1172
1173   // Obey send window size of the session if session flow control is
1174   // enabled.
1175   if (flow_control_state_ == FLOW_CONTROL_STREAM_AND_SESSION) {
1176     if (send_stalled_by_session) {
1177       stream->set_send_stalled_by_flow_control(true);
1178       QueueSendStalledStream(*stream);
1179       net_log().AddEvent(
1180           NetLog::TYPE_HTTP2_SESSION_STREAM_STALLED_BY_SESSION_SEND_WINDOW,
1181           NetLog::IntegerCallback("stream_id", stream_id));
1182       return scoped_ptr<SpdyBuffer>();
1183     }
1184
1185     effective_len = std::min(effective_len, session_send_window_size_);
1186   }
1187
1188   DCHECK_GE(effective_len, 0);
1189
1190   // Clear FIN flag if only some of the data will be in the data
1191   // frame.
1192   if (effective_len < len)
1193     flags = static_cast<SpdyDataFlags>(flags & ~DATA_FLAG_FIN);
1194
1195   if (net_log().IsLogging()) {
1196     net_log().AddEvent(NetLog::TYPE_HTTP2_SESSION_SEND_DATA,
1197                        base::Bind(&NetLogSpdyDataCallback, stream_id,
1198                                   effective_len, (flags & DATA_FLAG_FIN) != 0));
1199   }
1200
1201   // Send PrefacePing for DATA_FRAMEs with nonzero payload size.
1202   if (effective_len > 0)
1203     SendPrefacePingIfNoneInFlight();
1204
1205   // TODO(mbelshe): reduce memory copies here.
1206   DCHECK(buffered_spdy_framer_.get());
1207   scoped_ptr<SpdyFrame> frame(
1208       buffered_spdy_framer_->CreateDataFrame(
1209           stream_id, data->data(),
1210           static_cast<uint32>(effective_len), flags));
1211
1212   scoped_ptr<SpdyBuffer> data_buffer(new SpdyBuffer(frame.Pass()));
1213
1214   // Send window size is based on payload size, so nothing to do if this is
1215   // just a FIN with no payload.
1216   if (flow_control_state_ == FLOW_CONTROL_STREAM_AND_SESSION &&
1217       effective_len != 0) {
1218     DecreaseSendWindowSize(static_cast<int32>(effective_len));
1219     data_buffer->AddConsumeCallback(
1220         base::Bind(&SpdySession::OnWriteBufferConsumed,
1221                    weak_factory_.GetWeakPtr(),
1222                    static_cast<size_t>(effective_len)));
1223   }
1224
1225   return data_buffer.Pass();
1226 }
1227
1228 void SpdySession::CloseActiveStream(SpdyStreamId stream_id, int status) {
1229   DCHECK_NE(stream_id, 0u);
1230
1231   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
1232   if (it == active_streams_.end()) {
1233     NOTREACHED();
1234     return;
1235   }
1236
1237   CloseActiveStreamIterator(it, status);
1238 }
1239
1240 void SpdySession::CloseCreatedStream(
1241     const base::WeakPtr<SpdyStream>& stream, int status) {
1242   DCHECK_EQ(stream->stream_id(), 0u);
1243
1244   CreatedStreamSet::iterator it = created_streams_.find(stream.get());
1245   if (it == created_streams_.end()) {
1246     NOTREACHED();
1247     return;
1248   }
1249
1250   CloseCreatedStreamIterator(it, status);
1251 }
1252
1253 void SpdySession::ResetStream(SpdyStreamId stream_id,
1254                               SpdyRstStreamStatus status,
1255                               const std::string& description) {
1256   DCHECK_NE(stream_id, 0u);
1257
1258   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
1259   if (it == active_streams_.end()) {
1260     NOTREACHED();
1261     return;
1262   }
1263
1264   ResetStreamIterator(it, status, description);
1265 }
1266
1267 bool SpdySession::IsStreamActive(SpdyStreamId stream_id) const {
1268   return ContainsKey(active_streams_, stream_id);
1269 }
1270
1271 LoadState SpdySession::GetLoadState() const {
1272   // Just report that we're idle since the session could be doing
1273   // many things concurrently.
1274   return LOAD_STATE_IDLE;
1275 }
1276
1277 void SpdySession::CloseActiveStreamIterator(ActiveStreamMap::iterator it,
1278                                             int status) {
1279   // TODO(mbelshe): We should send a RST_STREAM control frame here
1280   //                so that the server can cancel a large send.
1281
1282   scoped_ptr<SpdyStream> owned_stream(it->second.stream);
1283   active_streams_.erase(it);
1284
1285   // TODO(akalin): When SpdyStream was ref-counted (and
1286   // |unclaimed_pushed_streams_| held scoped_refptr<SpdyStream>), this
1287   // was only done when status was not OK. This meant that pushed
1288   // streams can still be claimed after they're closed. This is
1289   // probably something that we still want to support, although server
1290   // push is hardly used. Write tests for this and fix this. (See
1291   // http://crbug.com/261712 .)
1292   if (owned_stream->type() == SPDY_PUSH_STREAM) {
1293     unclaimed_pushed_streams_.erase(owned_stream->url());
1294     num_pushed_streams_--;
1295     if (!owned_stream->IsReservedRemote())
1296       num_active_pushed_streams_--;
1297   }
1298
1299   DeleteStream(owned_stream.Pass(), status);
1300   MaybeFinishGoingAway();
1301
1302   // If there are no active streams and the socket pool is stalled, close the
1303   // session to free up a socket slot.
1304   if (active_streams_.empty() && connection_->IsPoolStalled()) {
1305     DoDrainSession(ERR_CONNECTION_CLOSED, "Closing idle connection.");
1306   }
1307 }
1308
1309 void SpdySession::CloseCreatedStreamIterator(CreatedStreamSet::iterator it,
1310                                              int status) {
1311   scoped_ptr<SpdyStream> owned_stream(*it);
1312   created_streams_.erase(it);
1313   DeleteStream(owned_stream.Pass(), status);
1314 }
1315
1316 void SpdySession::ResetStreamIterator(ActiveStreamMap::iterator it,
1317                                       SpdyRstStreamStatus status,
1318                                       const std::string& description) {
1319   // Send the RST_STREAM frame first as CloseActiveStreamIterator()
1320   // may close us.
1321   SpdyStreamId stream_id = it->first;
1322   RequestPriority priority = it->second.stream->priority();
1323   EnqueueResetStreamFrame(stream_id, priority, status, description);
1324
1325   // Removes any pending writes for the stream except for possibly an
1326   // in-flight one.
1327   CloseActiveStreamIterator(it, ERR_SPDY_PROTOCOL_ERROR);
1328 }
1329
1330 void SpdySession::EnqueueResetStreamFrame(SpdyStreamId stream_id,
1331                                           RequestPriority priority,
1332                                           SpdyRstStreamStatus status,
1333                                           const std::string& description) {
1334   DCHECK_NE(stream_id, 0u);
1335
1336   net_log().AddEvent(
1337       NetLog::TYPE_HTTP2_SESSION_SEND_RST_STREAM,
1338       base::Bind(&NetLogSpdyRstCallback, stream_id, status, &description));
1339
1340   DCHECK(buffered_spdy_framer_.get());
1341   scoped_ptr<SpdyFrame> rst_frame(
1342       buffered_spdy_framer_->CreateRstStream(stream_id, status));
1343
1344   EnqueueSessionWrite(priority, RST_STREAM, rst_frame.Pass());
1345   RecordProtocolErrorHistogram(MapRstStreamStatusToProtocolError(status));
1346 }
1347
1348 void SpdySession::PumpReadLoop(ReadState expected_read_state, int result) {
1349   // TODO(pkasting): Remove ScopedTracker below once crbug.com/462774 is fixed.
1350   tracked_objects::ScopedTracker tracking_profile(
1351       FROM_HERE_WITH_EXPLICIT_FUNCTION("462774 SpdySession::PumpReadLoop"));
1352
1353   CHECK(!in_io_loop_);
1354   if (availability_state_ == STATE_DRAINING) {
1355     return;
1356   }
1357   ignore_result(DoReadLoop(expected_read_state, result));
1358 }
1359
1360 int SpdySession::DoReadLoop(ReadState expected_read_state, int result) {
1361   CHECK(!in_io_loop_);
1362   CHECK_EQ(read_state_, expected_read_state);
1363
1364   in_io_loop_ = true;
1365
1366   int bytes_read_without_yielding = 0;
1367
1368   // Loop until the session is draining, the read becomes blocked, or
1369   // the read limit is exceeded.
1370   while (true) {
1371     switch (read_state_) {
1372       case READ_STATE_DO_READ:
1373         CHECK_EQ(result, OK);
1374         result = DoRead();
1375         break;
1376       case READ_STATE_DO_READ_COMPLETE:
1377         if (result > 0)
1378           bytes_read_without_yielding += result;
1379         result = DoReadComplete(result);
1380         break;
1381       default:
1382         NOTREACHED() << "read_state_: " << read_state_;
1383         break;
1384     }
1385
1386     if (availability_state_ == STATE_DRAINING)
1387       break;
1388
1389     if (result == ERR_IO_PENDING)
1390       break;
1391
1392     if (bytes_read_without_yielding > kMaxReadBytesWithoutYielding) {
1393       read_state_ = READ_STATE_DO_READ;
1394       base::MessageLoop::current()->PostTask(
1395           FROM_HERE,
1396           base::Bind(&SpdySession::PumpReadLoop,
1397                      weak_factory_.GetWeakPtr(), READ_STATE_DO_READ, OK));
1398       result = ERR_IO_PENDING;
1399       break;
1400     }
1401   }
1402
1403   CHECK(in_io_loop_);
1404   in_io_loop_ = false;
1405
1406   return result;
1407 }
1408
1409 int SpdySession::DoRead() {
1410   CHECK(in_io_loop_);
1411
1412   CHECK(connection_);
1413   CHECK(connection_->socket());
1414   read_state_ = READ_STATE_DO_READ_COMPLETE;
1415   return connection_->socket()->Read(
1416       read_buffer_.get(),
1417       kReadBufferSize,
1418       base::Bind(&SpdySession::PumpReadLoop,
1419                  weak_factory_.GetWeakPtr(), READ_STATE_DO_READ_COMPLETE));
1420 }
1421
1422 int SpdySession::DoReadComplete(int result) {
1423   CHECK(in_io_loop_);
1424
1425   // Parse a frame.  For now this code requires that the frame fit into our
1426   // buffer (kReadBufferSize).
1427   // TODO(mbelshe): support arbitrarily large frames!
1428
1429   if (result == 0) {
1430     UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySession.BytesRead.EOF",
1431                                 total_bytes_received_, 1, 100000000, 50);
1432     DoDrainSession(ERR_CONNECTION_CLOSED, "Connection closed");
1433
1434     return ERR_CONNECTION_CLOSED;
1435   }
1436
1437   if (result < 0) {
1438     DoDrainSession(static_cast<Error>(result), "result is < 0.");
1439     return result;
1440   }
1441   CHECK_LE(result, kReadBufferSize);
1442   total_bytes_received_ += result;
1443
1444   last_activity_time_ = time_func_();
1445
1446   DCHECK(buffered_spdy_framer_.get());
1447   char* data = read_buffer_->data();
1448   while (result > 0) {
1449     uint32 bytes_processed = buffered_spdy_framer_->ProcessInput(data, result);
1450     result -= bytes_processed;
1451     data += bytes_processed;
1452
1453     if (availability_state_ == STATE_DRAINING) {
1454       return ERR_CONNECTION_CLOSED;
1455     }
1456
1457     DCHECK_EQ(buffered_spdy_framer_->error_code(), SpdyFramer::SPDY_NO_ERROR);
1458   }
1459
1460   read_state_ = READ_STATE_DO_READ;
1461   return OK;
1462 }
1463
1464 void SpdySession::PumpWriteLoop(WriteState expected_write_state, int result) {
1465   CHECK(!in_io_loop_);
1466   DCHECK_EQ(write_state_, expected_write_state);
1467
1468   DoWriteLoop(expected_write_state, result);
1469
1470   if (availability_state_ == STATE_DRAINING && !in_flight_write_ &&
1471       write_queue_.IsEmpty()) {
1472     pool_->RemoveUnavailableSession(GetWeakPtr());  // Destroys |this|.
1473     return;
1474   }
1475 }
1476
1477 int SpdySession::DoWriteLoop(WriteState expected_write_state, int result) {
1478   CHECK(!in_io_loop_);
1479   DCHECK_NE(write_state_, WRITE_STATE_IDLE);
1480   DCHECK_EQ(write_state_, expected_write_state);
1481
1482   in_io_loop_ = true;
1483
1484   // Loop until the session is closed or the write becomes blocked.
1485   while (true) {
1486     switch (write_state_) {
1487       case WRITE_STATE_DO_WRITE:
1488         DCHECK_EQ(result, OK);
1489         result = DoWrite();
1490         break;
1491       case WRITE_STATE_DO_WRITE_COMPLETE:
1492         result = DoWriteComplete(result);
1493         break;
1494       case WRITE_STATE_IDLE:
1495       default:
1496         NOTREACHED() << "write_state_: " << write_state_;
1497         break;
1498     }
1499
1500     if (write_state_ == WRITE_STATE_IDLE) {
1501       DCHECK_EQ(result, ERR_IO_PENDING);
1502       break;
1503     }
1504
1505     if (result == ERR_IO_PENDING)
1506       break;
1507   }
1508
1509   CHECK(in_io_loop_);
1510   in_io_loop_ = false;
1511
1512   return result;
1513 }
1514
1515 int SpdySession::DoWrite() {
1516   CHECK(in_io_loop_);
1517
1518   DCHECK(buffered_spdy_framer_);
1519   if (in_flight_write_) {
1520     DCHECK_GT(in_flight_write_->GetRemainingSize(), 0u);
1521   } else {
1522     // Grab the next frame to send.
1523     SpdyFrameType frame_type = DATA;
1524     scoped_ptr<SpdyBufferProducer> producer;
1525     base::WeakPtr<SpdyStream> stream;
1526     if (!write_queue_.Dequeue(&frame_type, &producer, &stream)) {
1527       write_state_ = WRITE_STATE_IDLE;
1528       return ERR_IO_PENDING;
1529     }
1530
1531     if (stream.get())
1532       CHECK(!stream->IsClosed());
1533
1534     // Activate the stream only when sending the SYN_STREAM frame to
1535     // guarantee monotonically-increasing stream IDs.
1536     if (frame_type == SYN_STREAM) {
1537       CHECK(stream.get());
1538       CHECK_EQ(stream->stream_id(), 0u);
1539       scoped_ptr<SpdyStream> owned_stream =
1540           ActivateCreatedStream(stream.get());
1541       InsertActivatedStream(owned_stream.Pass());
1542
1543       if (stream_hi_water_mark_ > kLastStreamId) {
1544         CHECK_EQ(stream->stream_id(), kLastStreamId);
1545         // We've exhausted the stream ID space, and no new streams may be
1546         // created after this one.
1547         MakeUnavailable();
1548         StartGoingAway(kLastStreamId, ERR_ABORTED);
1549       }
1550     }
1551
1552     // TODO(pkasting): Remove ScopedTracker below once crbug.com/457517 is
1553     // fixed.
1554     tracked_objects::ScopedTracker tracking_profile1(
1555         FROM_HERE_WITH_EXPLICIT_FUNCTION("457517 SpdySession::DoWrite1"));
1556     in_flight_write_ = producer->ProduceBuffer();
1557     if (!in_flight_write_) {
1558       NOTREACHED();
1559       return ERR_UNEXPECTED;
1560     }
1561     in_flight_write_frame_type_ = frame_type;
1562     in_flight_write_frame_size_ = in_flight_write_->GetRemainingSize();
1563     DCHECK_GE(in_flight_write_frame_size_,
1564               buffered_spdy_framer_->GetFrameMinimumSize());
1565     in_flight_write_stream_ = stream;
1566   }
1567
1568   write_state_ = WRITE_STATE_DO_WRITE_COMPLETE;
1569
1570   // Explicitly store in a scoped_refptr<IOBuffer> to avoid problems
1571   // with Socket implementations that don't store their IOBuffer
1572   // argument in a scoped_refptr<IOBuffer> (see crbug.com/232345).
1573   // TODO(pkasting): Remove ScopedTracker below once crbug.com/457517 is fixed.
1574   tracked_objects::ScopedTracker tracking_profile2(
1575       FROM_HERE_WITH_EXPLICIT_FUNCTION("457517 SpdySession::DoWrite2"));
1576   scoped_refptr<IOBuffer> write_io_buffer =
1577       in_flight_write_->GetIOBufferForRemainingData();
1578   return connection_->socket()->Write(
1579       write_io_buffer.get(),
1580       in_flight_write_->GetRemainingSize(),
1581       base::Bind(&SpdySession::PumpWriteLoop,
1582                  weak_factory_.GetWeakPtr(), WRITE_STATE_DO_WRITE_COMPLETE));
1583 }
1584
1585 int SpdySession::DoWriteComplete(int result) {
1586   CHECK(in_io_loop_);
1587   DCHECK_NE(result, ERR_IO_PENDING);
1588   DCHECK_GT(in_flight_write_->GetRemainingSize(), 0u);
1589
1590   last_activity_time_ = time_func_();
1591
1592   if (result < 0) {
1593     DCHECK_NE(result, ERR_IO_PENDING);
1594     in_flight_write_.reset();
1595     in_flight_write_frame_type_ = DATA;
1596     in_flight_write_frame_size_ = 0;
1597     in_flight_write_stream_.reset();
1598     write_state_ = WRITE_STATE_DO_WRITE;
1599     DoDrainSession(static_cast<Error>(result), "Write error");
1600     return OK;
1601   }
1602
1603   // It should not be possible to have written more bytes than our
1604   // in_flight_write_.
1605   DCHECK_LE(static_cast<size_t>(result),
1606             in_flight_write_->GetRemainingSize());
1607
1608   if (result > 0) {
1609     in_flight_write_->Consume(static_cast<size_t>(result));
1610
1611     // We only notify the stream when we've fully written the pending frame.
1612     if (in_flight_write_->GetRemainingSize() == 0) {
1613       // It is possible that the stream was cancelled while we were
1614       // writing to the socket.
1615       if (in_flight_write_stream_.get()) {
1616         DCHECK_GT(in_flight_write_frame_size_, 0u);
1617         in_flight_write_stream_->OnFrameWriteComplete(
1618             in_flight_write_frame_type_,
1619             in_flight_write_frame_size_);
1620       }
1621
1622       // Cleanup the write which just completed.
1623       in_flight_write_.reset();
1624       in_flight_write_frame_type_ = DATA;
1625       in_flight_write_frame_size_ = 0;
1626       in_flight_write_stream_.reset();
1627     }
1628   }
1629
1630   write_state_ = WRITE_STATE_DO_WRITE;
1631   return OK;
1632 }
1633
1634 void SpdySession::DcheckGoingAway() const {
1635 #if DCHECK_IS_ON()
1636   DCHECK_GE(availability_state_, STATE_GOING_AWAY);
1637   for (int i = MINIMUM_PRIORITY; i <= MAXIMUM_PRIORITY; ++i) {
1638     DCHECK(pending_create_stream_queues_[i].empty());
1639   }
1640   DCHECK(created_streams_.empty());
1641 #endif
1642 }
1643
1644 void SpdySession::DcheckDraining() const {
1645   DcheckGoingAway();
1646   DCHECK_EQ(availability_state_, STATE_DRAINING);
1647   DCHECK(active_streams_.empty());
1648   DCHECK(unclaimed_pushed_streams_.empty());
1649 }
1650
1651 void SpdySession::StartGoingAway(SpdyStreamId last_good_stream_id,
1652                                  Error status) {
1653   DCHECK_GE(availability_state_, STATE_GOING_AWAY);
1654
1655   // The loops below are carefully written to avoid reentrancy problems.
1656
1657   while (true) {
1658     size_t old_size = GetTotalSize(pending_create_stream_queues_);
1659     base::WeakPtr<SpdyStreamRequest> pending_request =
1660         GetNextPendingStreamRequest();
1661     if (!pending_request)
1662       break;
1663     // No new stream requests should be added while the session is
1664     // going away.
1665     DCHECK_GT(old_size, GetTotalSize(pending_create_stream_queues_));
1666     pending_request->OnRequestCompleteFailure(ERR_ABORTED);
1667   }
1668
1669   while (true) {
1670     size_t old_size = active_streams_.size();
1671     ActiveStreamMap::iterator it =
1672         active_streams_.lower_bound(last_good_stream_id + 1);
1673     if (it == active_streams_.end())
1674       break;
1675     LogAbandonedActiveStream(it, status);
1676     CloseActiveStreamIterator(it, status);
1677     // No new streams should be activated while the session is going
1678     // away.
1679     DCHECK_GT(old_size, active_streams_.size());
1680   }
1681
1682   while (!created_streams_.empty()) {
1683     size_t old_size = created_streams_.size();
1684     CreatedStreamSet::iterator it = created_streams_.begin();
1685     LogAbandonedStream(*it, status);
1686     CloseCreatedStreamIterator(it, status);
1687     // No new streams should be created while the session is going
1688     // away.
1689     DCHECK_GT(old_size, created_streams_.size());
1690   }
1691
1692   write_queue_.RemovePendingWritesForStreamsAfter(last_good_stream_id);
1693
1694   DcheckGoingAway();
1695 }
1696
1697 void SpdySession::MaybeFinishGoingAway() {
1698   if (active_streams_.empty() && availability_state_ == STATE_GOING_AWAY) {
1699     DoDrainSession(OK, "Finished going away");
1700   }
1701 }
1702
1703 void SpdySession::DoDrainSession(Error err, const std::string& description) {
1704   if (availability_state_ == STATE_DRAINING) {
1705     return;
1706   }
1707   MakeUnavailable();
1708
1709   // Mark host_port_pair requiring HTTP/1.1 for subsequent connections.
1710   if (err == ERR_HTTP_1_1_REQUIRED) {
1711     http_server_properties_->SetHTTP11Required(host_port_pair());
1712   }
1713
1714   // If |err| indicates an error occurred, inform the peer that we're closing
1715   // and why. Don't GOAWAY on a graceful or idle close, as that may
1716   // unnecessarily wake the radio. We could technically GOAWAY on network errors
1717   // (we'll probably fail to actually write it, but that's okay), however many
1718   // unit-tests would need to be updated.
1719   if (err != OK &&
1720       err != ERR_ABORTED &&  // Used by SpdySessionPool to close idle sessions.
1721       err != ERR_NETWORK_CHANGED &&  // Used to deprecate sessions on IP change.
1722       err != ERR_SOCKET_NOT_CONNECTED && err != ERR_HTTP_1_1_REQUIRED &&
1723       err != ERR_CONNECTION_CLOSED && err != ERR_CONNECTION_RESET) {
1724     // Enqueue a GOAWAY to inform the peer of why we're closing the connection.
1725     SpdyGoAwayIR goaway_ir(last_accepted_push_stream_id_,
1726                            MapNetErrorToGoAwayStatus(err),
1727                            description);
1728     EnqueueSessionWrite(HIGHEST,
1729                         GOAWAY,
1730                         scoped_ptr<SpdyFrame>(
1731                             buffered_spdy_framer_->SerializeFrame(goaway_ir)));
1732   }
1733
1734   availability_state_ = STATE_DRAINING;
1735   error_on_close_ = err;
1736
1737   net_log_.AddEvent(
1738       NetLog::TYPE_HTTP2_SESSION_CLOSE,
1739       base::Bind(&NetLogSpdySessionCloseCallback, err, &description));
1740
1741   UMA_HISTOGRAM_SPARSE_SLOWLY("Net.SpdySession.ClosedOnError", -err);
1742   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySession.BytesRead.OtherErrors",
1743                               total_bytes_received_, 1, 100000000, 50);
1744
1745   if (err == OK) {
1746     // We ought to be going away already, as this is a graceful close.
1747     DcheckGoingAway();
1748   } else {
1749     StartGoingAway(0, err);
1750   }
1751   DcheckDraining();
1752   MaybePostWriteLoop();
1753 }
1754
1755 void SpdySession::LogAbandonedStream(SpdyStream* stream, Error status) {
1756   DCHECK(stream);
1757   std::string description = base::StringPrintf(
1758       "ABANDONED (stream_id=%d): ", stream->stream_id()) +
1759       stream->url().spec();
1760   stream->LogStreamError(status, description);
1761   // We don't increment the streams abandoned counter here. If the
1762   // stream isn't active (i.e., it hasn't written anything to the wire
1763   // yet) then it's as if it never existed. If it is active, then
1764   // LogAbandonedActiveStream() will increment the counters.
1765 }
1766
1767 void SpdySession::LogAbandonedActiveStream(ActiveStreamMap::const_iterator it,
1768                                            Error status) {
1769   DCHECK_GT(it->first, 0u);
1770   LogAbandonedStream(it->second.stream, status);
1771   ++streams_abandoned_count_;
1772   if (it->second.stream->type() == SPDY_PUSH_STREAM &&
1773       unclaimed_pushed_streams_.find(it->second.stream->url()) !=
1774       unclaimed_pushed_streams_.end()) {
1775   }
1776 }
1777
1778 SpdyStreamId SpdySession::GetNewStreamId() {
1779   CHECK_LE(stream_hi_water_mark_, kLastStreamId);
1780   SpdyStreamId id = stream_hi_water_mark_;
1781   stream_hi_water_mark_ += 2;
1782   return id;
1783 }
1784
1785 void SpdySession::CloseSessionOnError(Error err,
1786                                       const std::string& description) {
1787   DCHECK_LT(err, ERR_IO_PENDING);
1788   DoDrainSession(err, description);
1789 }
1790
1791 void SpdySession::MakeUnavailable() {
1792   if (availability_state_ == STATE_AVAILABLE) {
1793     availability_state_ = STATE_GOING_AWAY;
1794     pool_->MakeSessionUnavailable(GetWeakPtr());
1795   }
1796 }
1797
1798 base::Value* SpdySession::GetInfoAsValue() const {
1799   base::DictionaryValue* dict = new base::DictionaryValue();
1800
1801   dict->SetInteger("source_id", net_log_.source().id);
1802
1803   dict->SetString("host_port_pair", host_port_pair().ToString());
1804   if (!pooled_aliases_.empty()) {
1805     base::ListValue* alias_list = new base::ListValue();
1806     for (std::set<SpdySessionKey>::const_iterator it =
1807              pooled_aliases_.begin();
1808          it != pooled_aliases_.end(); it++) {
1809       alias_list->Append(new base::StringValue(
1810           it->host_port_pair().ToString()));
1811     }
1812     dict->Set("aliases", alias_list);
1813   }
1814   dict->SetString("proxy", host_port_proxy_pair().second.ToURI());
1815
1816   dict->SetInteger("active_streams", active_streams_.size());
1817
1818   dict->SetInteger("unclaimed_pushed_streams",
1819                    unclaimed_pushed_streams_.size());
1820
1821   dict->SetBoolean("is_secure", is_secure_);
1822
1823   dict->SetString("protocol_negotiated",
1824                   SSLClientSocket::NextProtoToString(
1825                       connection_->socket()->GetNegotiatedProtocol()));
1826
1827   dict->SetInteger("error", error_on_close_);
1828   dict->SetInteger("max_concurrent_streams", max_concurrent_streams_);
1829
1830   dict->SetInteger("streams_initiated_count", streams_initiated_count_);
1831   dict->SetInteger("streams_pushed_count", streams_pushed_count_);
1832   dict->SetInteger("streams_pushed_and_claimed_count",
1833       streams_pushed_and_claimed_count_);
1834   dict->SetInteger("streams_abandoned_count", streams_abandoned_count_);
1835   DCHECK(buffered_spdy_framer_.get());
1836   dict->SetInteger("frames_received", buffered_spdy_framer_->frames_received());
1837
1838   dict->SetBoolean("sent_settings", sent_settings_);
1839   dict->SetBoolean("received_settings", received_settings_);
1840
1841   dict->SetInteger("send_window_size", session_send_window_size_);
1842   dict->SetInteger("recv_window_size", session_recv_window_size_);
1843   dict->SetInteger("unacked_recv_window_bytes",
1844                    session_unacked_recv_window_bytes_);
1845   return dict;
1846 }
1847
1848 bool SpdySession::IsReused() const {
1849   return buffered_spdy_framer_->frames_received() > 0 ||
1850       connection_->reuse_type() == ClientSocketHandle::UNUSED_IDLE;
1851 }
1852
1853 bool SpdySession::GetLoadTimingInfo(SpdyStreamId stream_id,
1854                                     LoadTimingInfo* load_timing_info) const {
1855   return connection_->GetLoadTimingInfo(stream_id != kFirstStreamId,
1856                                         load_timing_info);
1857 }
1858
1859 int SpdySession::GetPeerAddress(IPEndPoint* address) const {
1860   int rv = ERR_SOCKET_NOT_CONNECTED;
1861   if (connection_->socket()) {
1862     rv = connection_->socket()->GetPeerAddress(address);
1863   }
1864
1865   UMA_HISTOGRAM_BOOLEAN("Net.SpdySessionSocketNotConnectedGetPeerAddress",
1866                         rv == ERR_SOCKET_NOT_CONNECTED);
1867
1868   return rv;
1869 }
1870
1871 int SpdySession::GetLocalAddress(IPEndPoint* address) const {
1872   int rv = ERR_SOCKET_NOT_CONNECTED;
1873   if (connection_->socket()) {
1874     rv = connection_->socket()->GetLocalAddress(address);
1875   }
1876
1877   UMA_HISTOGRAM_BOOLEAN("Net.SpdySessionSocketNotConnectedGetLocalAddress",
1878                         rv == ERR_SOCKET_NOT_CONNECTED);
1879
1880   return rv;
1881 }
1882
1883 void SpdySession::EnqueueSessionWrite(RequestPriority priority,
1884                                       SpdyFrameType frame_type,
1885                                       scoped_ptr<SpdyFrame> frame) {
1886   DCHECK(frame_type == RST_STREAM || frame_type == SETTINGS ||
1887          frame_type == WINDOW_UPDATE || frame_type == PING ||
1888          frame_type == GOAWAY);
1889   EnqueueWrite(
1890       priority, frame_type,
1891       scoped_ptr<SpdyBufferProducer>(
1892           new SimpleBufferProducer(
1893               scoped_ptr<SpdyBuffer>(new SpdyBuffer(frame.Pass())))),
1894       base::WeakPtr<SpdyStream>());
1895 }
1896
1897 void SpdySession::EnqueueWrite(RequestPriority priority,
1898                                SpdyFrameType frame_type,
1899                                scoped_ptr<SpdyBufferProducer> producer,
1900                                const base::WeakPtr<SpdyStream>& stream) {
1901   if (availability_state_ == STATE_DRAINING)
1902     return;
1903
1904   write_queue_.Enqueue(priority, frame_type, producer.Pass(), stream);
1905   MaybePostWriteLoop();
1906 }
1907
1908 void SpdySession::MaybePostWriteLoop() {
1909   if (write_state_ == WRITE_STATE_IDLE) {
1910     CHECK(!in_flight_write_);
1911     write_state_ = WRITE_STATE_DO_WRITE;
1912     base::MessageLoop::current()->PostTask(
1913         FROM_HERE,
1914         base::Bind(&SpdySession::PumpWriteLoop,
1915                    weak_factory_.GetWeakPtr(), WRITE_STATE_DO_WRITE, OK));
1916   }
1917 }
1918
1919 void SpdySession::InsertCreatedStream(scoped_ptr<SpdyStream> stream) {
1920   CHECK_EQ(stream->stream_id(), 0u);
1921   CHECK(created_streams_.find(stream.get()) == created_streams_.end());
1922   created_streams_.insert(stream.release());
1923 }
1924
1925 scoped_ptr<SpdyStream> SpdySession::ActivateCreatedStream(SpdyStream* stream) {
1926   CHECK_EQ(stream->stream_id(), 0u);
1927   CHECK(created_streams_.find(stream) != created_streams_.end());
1928   stream->set_stream_id(GetNewStreamId());
1929   scoped_ptr<SpdyStream> owned_stream(stream);
1930   created_streams_.erase(stream);
1931   return owned_stream.Pass();
1932 }
1933
1934 void SpdySession::InsertActivatedStream(scoped_ptr<SpdyStream> stream) {
1935   SpdyStreamId stream_id = stream->stream_id();
1936   CHECK_NE(stream_id, 0u);
1937   std::pair<ActiveStreamMap::iterator, bool> result =
1938       active_streams_.insert(
1939           std::make_pair(stream_id, ActiveStreamInfo(stream.get())));
1940   CHECK(result.second);
1941   ignore_result(stream.release());
1942 }
1943
1944 void SpdySession::DeleteStream(scoped_ptr<SpdyStream> stream, int status) {
1945   if (in_flight_write_stream_.get() == stream.get()) {
1946     // If we're deleting the stream for the in-flight write, we still
1947     // need to let the write complete, so we clear
1948     // |in_flight_write_stream_| and let the write finish on its own
1949     // without notifying |in_flight_write_stream_|.
1950     in_flight_write_stream_.reset();
1951   }
1952
1953   write_queue_.RemovePendingWritesForStream(stream->GetWeakPtr());
1954   stream->OnClose(status);
1955
1956   if (availability_state_ == STATE_AVAILABLE) {
1957     ProcessPendingStreamRequests();
1958   }
1959 }
1960
1961 base::WeakPtr<SpdyStream> SpdySession::GetActivePushStream(const GURL& url) {
1962   PushedStreamMap::iterator unclaimed_it = unclaimed_pushed_streams_.find(url);
1963   if (unclaimed_it == unclaimed_pushed_streams_.end())
1964     return base::WeakPtr<SpdyStream>();
1965
1966   SpdyStreamId stream_id = unclaimed_it->second.stream_id;
1967   unclaimed_pushed_streams_.erase(unclaimed_it);
1968
1969   ActiveStreamMap::iterator active_it = active_streams_.find(stream_id);
1970   if (active_it == active_streams_.end()) {
1971     NOTREACHED();
1972     return base::WeakPtr<SpdyStream>();
1973   }
1974
1975   net_log_.AddEvent(NetLog::TYPE_HTTP2_STREAM_ADOPTED_PUSH_STREAM,
1976                     base::Bind(&NetLogSpdyAdoptedPushStreamCallback,
1977                                active_it->second.stream->stream_id(), &url));
1978   return active_it->second.stream->GetWeakPtr();
1979 }
1980
1981 bool SpdySession::GetSSLInfo(SSLInfo* ssl_info,
1982                              bool* was_npn_negotiated,
1983                              NextProto* protocol_negotiated) {
1984   *was_npn_negotiated = connection_->socket()->WasNpnNegotiated();
1985   *protocol_negotiated = connection_->socket()->GetNegotiatedProtocol();
1986   return connection_->socket()->GetSSLInfo(ssl_info);
1987 }
1988
1989 bool SpdySession::GetSSLCertRequestInfo(
1990     SSLCertRequestInfo* cert_request_info) {
1991   if (!is_secure_)
1992     return false;
1993   GetSSLClientSocket()->GetSSLCertRequestInfo(cert_request_info);
1994   return true;
1995 }
1996
1997 void SpdySession::OnError(SpdyFramer::SpdyError error_code) {
1998   CHECK(in_io_loop_);
1999
2000   RecordProtocolErrorHistogram(MapFramerErrorToProtocolError(error_code));
2001   std::string description =
2002       base::StringPrintf("Framer error: %d (%s).",
2003                          error_code,
2004                          SpdyFramer::ErrorCodeToString(error_code));
2005   DoDrainSession(MapFramerErrorToNetError(error_code), description);
2006 }
2007
2008 void SpdySession::OnStreamError(SpdyStreamId stream_id,
2009                                 const std::string& description) {
2010   CHECK(in_io_loop_);
2011
2012   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2013   if (it == active_streams_.end()) {
2014     // We still want to send a frame to reset the stream even if we
2015     // don't know anything about it.
2016     EnqueueResetStreamFrame(
2017         stream_id, IDLE, RST_STREAM_PROTOCOL_ERROR, description);
2018     return;
2019   }
2020
2021   ResetStreamIterator(it, RST_STREAM_PROTOCOL_ERROR, description);
2022 }
2023
2024 void SpdySession::OnDataFrameHeader(SpdyStreamId stream_id,
2025                                     size_t length,
2026                                     bool fin) {
2027   CHECK(in_io_loop_);
2028
2029   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2030
2031   // By the time data comes in, the stream may already be inactive.
2032   if (it == active_streams_.end())
2033     return;
2034
2035   SpdyStream* stream = it->second.stream;
2036   CHECK_EQ(stream->stream_id(), stream_id);
2037
2038   DCHECK(buffered_spdy_framer_);
2039   size_t header_len = buffered_spdy_framer_->GetDataFrameMinimumSize();
2040   stream->IncrementRawReceivedBytes(header_len);
2041 }
2042
2043 void SpdySession::OnStreamFrameData(SpdyStreamId stream_id,
2044                                     const char* data,
2045                                     size_t len,
2046                                     bool fin) {
2047   CHECK(in_io_loop_);
2048
2049   if (data == NULL && len != 0) {
2050     // This is notification of consumed data padding.
2051     // TODO(jgraettinger): Properly flow padding into WINDOW_UPDATE frames.
2052     // See crbug.com/353012.
2053     return;
2054   }
2055
2056   DCHECK_LT(len, 1u << 24);
2057   if (net_log().IsLogging()) {
2058     net_log().AddEvent(
2059         NetLog::TYPE_HTTP2_SESSION_RECV_DATA,
2060         base::Bind(&NetLogSpdyDataCallback, stream_id, len, fin));
2061   }
2062
2063   // Build the buffer as early as possible so that we go through the
2064   // session flow control checks and update
2065   // |unacked_recv_window_bytes_| properly even when the stream is
2066   // inactive (since the other side has still reduced its session send
2067   // window).
2068   scoped_ptr<SpdyBuffer> buffer;
2069   if (data) {
2070     DCHECK_GT(len, 0u);
2071     CHECK_LE(len, static_cast<size_t>(kReadBufferSize));
2072     buffer.reset(new SpdyBuffer(data, len));
2073
2074     if (flow_control_state_ == FLOW_CONTROL_STREAM_AND_SESSION) {
2075       DecreaseRecvWindowSize(static_cast<int32>(len));
2076       buffer->AddConsumeCallback(
2077           base::Bind(&SpdySession::OnReadBufferConsumed,
2078                      weak_factory_.GetWeakPtr()));
2079     }
2080   } else {
2081     DCHECK_EQ(len, 0u);
2082   }
2083
2084   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2085
2086   // By the time data comes in, the stream may already be inactive.
2087   if (it == active_streams_.end())
2088     return;
2089
2090   SpdyStream* stream = it->second.stream;
2091   CHECK_EQ(stream->stream_id(), stream_id);
2092
2093   stream->IncrementRawReceivedBytes(len);
2094
2095   if (it->second.waiting_for_syn_reply) {
2096     const std::string& error = "Data received before SYN_REPLY.";
2097     stream->LogStreamError(ERR_SPDY_PROTOCOL_ERROR, error);
2098     ResetStreamIterator(it, RST_STREAM_PROTOCOL_ERROR, error);
2099     return;
2100   }
2101
2102   stream->OnDataReceived(buffer.Pass());
2103 }
2104
2105 void SpdySession::OnSettings(bool clear_persisted) {
2106   CHECK(in_io_loop_);
2107
2108   if (clear_persisted)
2109     http_server_properties_->ClearSpdySettings(host_port_pair());
2110
2111   if (net_log_.IsLogging()) {
2112     net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_RECV_SETTINGS,
2113                       base::Bind(&NetLogSpdySettingsCallback, host_port_pair(),
2114                                  clear_persisted));
2115   }
2116
2117   if (GetProtocolVersion() >= SPDY4) {
2118     // Send an acknowledgment of the setting.
2119     SpdySettingsIR settings_ir;
2120     settings_ir.set_is_ack(true);
2121     EnqueueSessionWrite(
2122         HIGHEST,
2123         SETTINGS,
2124         scoped_ptr<SpdyFrame>(
2125             buffered_spdy_framer_->SerializeFrame(settings_ir)));
2126   }
2127 }
2128
2129 void SpdySession::OnSetting(SpdySettingsIds id,
2130                             uint8 flags,
2131                             uint32 value) {
2132   CHECK(in_io_loop_);
2133
2134   HandleSetting(id, value);
2135   http_server_properties_->SetSpdySetting(
2136       host_port_pair(),
2137       id,
2138       static_cast<SpdySettingsFlags>(flags),
2139       value);
2140   received_settings_ = true;
2141
2142   // Log the setting.
2143   const SpdyMajorVersion protocol_version = GetProtocolVersion();
2144   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_RECV_SETTING,
2145                     base::Bind(&NetLogSpdySettingCallback, id, protocol_version,
2146                                static_cast<SpdySettingsFlags>(flags), value));
2147 }
2148
2149 void SpdySession::OnSendCompressedFrame(
2150     SpdyStreamId stream_id,
2151     SpdyFrameType type,
2152     size_t payload_len,
2153     size_t frame_len) {
2154   if (type != SYN_STREAM && type != HEADERS)
2155     return;
2156
2157   DCHECK(buffered_spdy_framer_.get());
2158   size_t compressed_len =
2159       frame_len - buffered_spdy_framer_->GetSynStreamMinimumSize();
2160
2161   if (payload_len) {
2162     // Make sure we avoid early decimal truncation.
2163     int compression_pct = 100 - (100 * compressed_len) / payload_len;
2164     UMA_HISTOGRAM_PERCENTAGE("Net.SpdySynStreamCompressionPercentage",
2165                              compression_pct);
2166   }
2167 }
2168
2169 void SpdySession::OnReceiveCompressedFrame(
2170     SpdyStreamId stream_id,
2171     SpdyFrameType type,
2172     size_t frame_len) {
2173   last_compressed_frame_len_ = frame_len;
2174 }
2175
2176 int SpdySession::OnInitialResponseHeadersReceived(
2177     const SpdyHeaderBlock& response_headers,
2178     base::Time response_time,
2179     base::TimeTicks recv_first_byte_time,
2180     SpdyStream* stream) {
2181   CHECK(in_io_loop_);
2182   SpdyStreamId stream_id = stream->stream_id();
2183
2184   if (stream->type() == SPDY_PUSH_STREAM) {
2185     DCHECK(stream->IsReservedRemote());
2186     if (max_concurrent_pushed_streams_ &&
2187         num_active_pushed_streams_ >= max_concurrent_pushed_streams_) {
2188       ResetStream(stream_id,
2189                   RST_STREAM_REFUSED_STREAM,
2190                   "Stream concurrency limit reached.");
2191       return STATUS_CODE_REFUSED_STREAM;
2192     }
2193   }
2194
2195   if (stream->type() == SPDY_PUSH_STREAM) {
2196     // Will be balanced in DeleteStream.
2197     num_active_pushed_streams_++;
2198   }
2199
2200   // May invalidate |stream|.
2201   int rv = stream->OnInitialResponseHeadersReceived(
2202       response_headers, response_time, recv_first_byte_time);
2203   if (rv < 0) {
2204     DCHECK_NE(rv, ERR_IO_PENDING);
2205     DCHECK(active_streams_.find(stream_id) == active_streams_.end());
2206   }
2207
2208   return rv;
2209 }
2210
2211 void SpdySession::OnSynStream(SpdyStreamId stream_id,
2212                               SpdyStreamId associated_stream_id,
2213                               SpdyPriority priority,
2214                               bool fin,
2215                               bool unidirectional,
2216                               const SpdyHeaderBlock& headers) {
2217   CHECK(in_io_loop_);
2218
2219   DCHECK_LE(GetProtocolVersion(), SPDY3);
2220
2221   base::Time response_time = base::Time::Now();
2222   base::TimeTicks recv_first_byte_time = time_func_();
2223
2224   if (net_log_.IsLogging()) {
2225     net_log_.AddEvent(
2226         NetLog::TYPE_HTTP2_SESSION_PUSHED_SYN_STREAM,
2227         base::Bind(&NetLogSpdySynStreamReceivedCallback, &headers, fin,
2228                    unidirectional, priority, stream_id, associated_stream_id));
2229   }
2230
2231   // Split headers to simulate push promise and response.
2232   SpdyHeaderBlock request_headers;
2233   SpdyHeaderBlock response_headers;
2234   SplitPushedHeadersToRequestAndResponse(
2235       headers, GetProtocolVersion(), &request_headers, &response_headers);
2236
2237   if (!TryCreatePushStream(
2238           stream_id, associated_stream_id, priority, request_headers))
2239     return;
2240
2241   ActiveStreamMap::iterator active_it = active_streams_.find(stream_id);
2242   if (active_it == active_streams_.end()) {
2243     NOTREACHED();
2244     return;
2245   }
2246
2247   OnInitialResponseHeadersReceived(response_headers, response_time,
2248                                    recv_first_byte_time,
2249                                    active_it->second.stream);
2250 }
2251
2252 void SpdySession::DeleteExpiredPushedStreams() {
2253   if (unclaimed_pushed_streams_.empty())
2254     return;
2255
2256   // Check that adequate time has elapsed since the last sweep.
2257   if (time_func_() < next_unclaimed_push_stream_sweep_time_)
2258     return;
2259
2260   // Gather old streams to delete.
2261   base::TimeTicks minimum_freshness = time_func_() -
2262       base::TimeDelta::FromSeconds(kMinPushedStreamLifetimeSeconds);
2263   std::vector<SpdyStreamId> streams_to_close;
2264   for (PushedStreamMap::iterator it = unclaimed_pushed_streams_.begin();
2265        it != unclaimed_pushed_streams_.end(); ++it) {
2266     if (minimum_freshness > it->second.creation_time)
2267       streams_to_close.push_back(it->second.stream_id);
2268   }
2269
2270   for (std::vector<SpdyStreamId>::const_iterator to_close_it =
2271            streams_to_close.begin();
2272        to_close_it != streams_to_close.end(); ++to_close_it) {
2273     ActiveStreamMap::iterator active_it = active_streams_.find(*to_close_it);
2274     if (active_it == active_streams_.end())
2275       continue;
2276
2277     LogAbandonedActiveStream(active_it, ERR_INVALID_SPDY_STREAM);
2278     // CloseActiveStreamIterator() will remove the stream from
2279     // |unclaimed_pushed_streams_|.
2280     ResetStreamIterator(
2281         active_it, RST_STREAM_REFUSED_STREAM, "Stream not claimed.");
2282   }
2283
2284   next_unclaimed_push_stream_sweep_time_ = time_func_() +
2285       base::TimeDelta::FromSeconds(kMinPushedStreamLifetimeSeconds);
2286 }
2287
2288 void SpdySession::OnSynReply(SpdyStreamId stream_id,
2289                              bool fin,
2290                              const SpdyHeaderBlock& headers) {
2291   CHECK(in_io_loop_);
2292
2293   base::Time response_time = base::Time::Now();
2294   base::TimeTicks recv_first_byte_time = time_func_();
2295
2296   if (net_log().IsLogging()) {
2297     net_log().AddEvent(NetLog::TYPE_HTTP2_SESSION_SYN_REPLY,
2298                        base::Bind(&NetLogSpdySynReplyOrHeadersReceivedCallback,
2299                                   &headers, fin, stream_id));
2300   }
2301
2302   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2303   if (it == active_streams_.end()) {
2304     // NOTE:  it may just be that the stream was cancelled.
2305     return;
2306   }
2307
2308   SpdyStream* stream = it->second.stream;
2309   CHECK_EQ(stream->stream_id(), stream_id);
2310
2311   stream->IncrementRawReceivedBytes(last_compressed_frame_len_);
2312   last_compressed_frame_len_ = 0;
2313
2314   if (GetProtocolVersion() >= SPDY4) {
2315     const std::string& error =
2316         "SPDY4 wasn't expecting SYN_REPLY.";
2317     stream->LogStreamError(ERR_SPDY_PROTOCOL_ERROR, error);
2318     ResetStreamIterator(it, RST_STREAM_PROTOCOL_ERROR, error);
2319     return;
2320   }
2321   if (!it->second.waiting_for_syn_reply) {
2322     const std::string& error =
2323         "Received duplicate SYN_REPLY for stream.";
2324     stream->LogStreamError(ERR_SPDY_PROTOCOL_ERROR, error);
2325     ResetStreamIterator(it, RST_STREAM_PROTOCOL_ERROR, error);
2326     return;
2327   }
2328   it->second.waiting_for_syn_reply = false;
2329
2330   ignore_result(OnInitialResponseHeadersReceived(
2331       headers, response_time, recv_first_byte_time, stream));
2332 }
2333
2334 void SpdySession::OnHeaders(SpdyStreamId stream_id,
2335                             bool has_priority,
2336                             SpdyPriority priority,
2337                             bool fin,
2338                             const SpdyHeaderBlock& headers) {
2339   CHECK(in_io_loop_);
2340
2341   if (net_log().IsLogging()) {
2342     net_log().AddEvent(NetLog::TYPE_HTTP2_SESSION_RECV_HEADERS,
2343                        base::Bind(&NetLogSpdySynReplyOrHeadersReceivedCallback,
2344                                   &headers, fin, stream_id));
2345   }
2346
2347   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2348   if (it == active_streams_.end()) {
2349     // NOTE:  it may just be that the stream was cancelled.
2350     LOG(WARNING) << "Received HEADERS for invalid stream " << stream_id;
2351     return;
2352   }
2353
2354   SpdyStream* stream = it->second.stream;
2355   CHECK_EQ(stream->stream_id(), stream_id);
2356
2357   stream->IncrementRawReceivedBytes(last_compressed_frame_len_);
2358   last_compressed_frame_len_ = 0;
2359
2360   base::Time response_time = base::Time::Now();
2361   base::TimeTicks recv_first_byte_time = time_func_();
2362
2363   if (it->second.waiting_for_syn_reply) {
2364     if (GetProtocolVersion() < SPDY4) {
2365       const std::string& error =
2366           "Was expecting SYN_REPLY, not HEADERS.";
2367       stream->LogStreamError(ERR_SPDY_PROTOCOL_ERROR, error);
2368       ResetStreamIterator(it, RST_STREAM_PROTOCOL_ERROR, error);
2369       return;
2370     }
2371
2372     it->second.waiting_for_syn_reply = false;
2373     ignore_result(OnInitialResponseHeadersReceived(
2374         headers, response_time, recv_first_byte_time, stream));
2375   } else if (it->second.stream->IsReservedRemote()) {
2376     ignore_result(OnInitialResponseHeadersReceived(
2377         headers, response_time, recv_first_byte_time, stream));
2378   } else {
2379     int rv = stream->OnAdditionalResponseHeadersReceived(headers);
2380     if (rv < 0) {
2381       DCHECK_NE(rv, ERR_IO_PENDING);
2382       DCHECK(active_streams_.find(stream_id) == active_streams_.end());
2383     }
2384   }
2385 }
2386
2387 bool SpdySession::OnUnknownFrame(SpdyStreamId stream_id, int frame_type) {
2388   // Validate stream id.
2389   // Was the frame sent on a stream id that has not been used in this session?
2390   if (stream_id % 2 == 1 && stream_id > stream_hi_water_mark_)
2391     return false;
2392
2393   if (stream_id % 2 == 0 && stream_id > last_accepted_push_stream_id_)
2394     return false;
2395
2396   return true;
2397 }
2398
2399 void SpdySession::OnRstStream(SpdyStreamId stream_id,
2400                               SpdyRstStreamStatus status) {
2401   CHECK(in_io_loop_);
2402
2403   std::string description;
2404   net_log().AddEvent(
2405       NetLog::TYPE_HTTP2_SESSION_RST_STREAM,
2406       base::Bind(&NetLogSpdyRstCallback, stream_id, status, &description));
2407
2408   ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2409   if (it == active_streams_.end()) {
2410     // NOTE:  it may just be that the stream was cancelled.
2411     LOG(WARNING) << "Received RST for invalid stream" << stream_id;
2412     return;
2413   }
2414
2415   CHECK_EQ(it->second.stream->stream_id(), stream_id);
2416
2417   if (status == 0) {
2418     it->second.stream->OnDataReceived(scoped_ptr<SpdyBuffer>());
2419   } else if (status == RST_STREAM_REFUSED_STREAM) {
2420     CloseActiveStreamIterator(it, ERR_SPDY_SERVER_REFUSED_STREAM);
2421   } else if (status == RST_STREAM_HTTP_1_1_REQUIRED) {
2422     // TODO(bnc): Record histogram with number of open streams capped at 50.
2423     it->second.stream->LogStreamError(
2424         ERR_HTTP_1_1_REQUIRED,
2425         base::StringPrintf(
2426             "SPDY session closed because of stream with status: %d", status));
2427     DoDrainSession(ERR_HTTP_1_1_REQUIRED, "HTTP_1_1_REQUIRED for stream.");
2428   } else {
2429     RecordProtocolErrorHistogram(
2430         PROTOCOL_ERROR_RST_STREAM_FOR_NON_ACTIVE_STREAM);
2431     it->second.stream->LogStreamError(
2432         ERR_SPDY_PROTOCOL_ERROR,
2433         base::StringPrintf("SPDY stream closed with status: %d", status));
2434     // TODO(mbelshe): Map from Spdy-protocol errors to something sensical.
2435     //                For now, it doesn't matter much - it is a protocol error.
2436     CloseActiveStreamIterator(it, ERR_SPDY_PROTOCOL_ERROR);
2437   }
2438 }
2439
2440 void SpdySession::OnGoAway(SpdyStreamId last_accepted_stream_id,
2441                            SpdyGoAwayStatus status) {
2442   CHECK(in_io_loop_);
2443
2444   // TODO(jgraettinger): UMA histogram on |status|.
2445
2446   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_GOAWAY,
2447                     base::Bind(&NetLogSpdyGoAwayCallback,
2448                                last_accepted_stream_id, active_streams_.size(),
2449                                unclaimed_pushed_streams_.size(), status));
2450   MakeUnavailable();
2451   if (status == GOAWAY_HTTP_1_1_REQUIRED) {
2452     // TODO(bnc): Record histogram with number of open streams capped at 50.
2453     DoDrainSession(ERR_HTTP_1_1_REQUIRED, "HTTP_1_1_REQUIRED for stream.");
2454   } else {
2455     StartGoingAway(last_accepted_stream_id, ERR_ABORTED);
2456   }
2457   // This is to handle the case when we already don't have any active
2458   // streams (i.e., StartGoingAway() did nothing). Otherwise, we have
2459   // active streams and so the last one being closed will finish the
2460   // going away process (see DeleteStream()).
2461   MaybeFinishGoingAway();
2462 }
2463
2464 void SpdySession::OnPing(SpdyPingId unique_id, bool is_ack) {
2465   CHECK(in_io_loop_);
2466
2467   net_log_.AddEvent(
2468       NetLog::TYPE_HTTP2_SESSION_PING,
2469       base::Bind(&NetLogSpdyPingCallback, unique_id, is_ack, "received"));
2470
2471   // Send response to a PING from server.
2472   if ((protocol_ >= kProtoSPDY4MinimumVersion && !is_ack) ||
2473       (protocol_ < kProtoSPDY4MinimumVersion && unique_id % 2 == 0)) {
2474     WritePingFrame(unique_id, true);
2475     return;
2476   }
2477
2478   --pings_in_flight_;
2479   if (pings_in_flight_ < 0) {
2480     RecordProtocolErrorHistogram(PROTOCOL_ERROR_UNEXPECTED_PING);
2481     DoDrainSession(ERR_SPDY_PROTOCOL_ERROR, "pings_in_flight_ is < 0.");
2482     pings_in_flight_ = 0;
2483     return;
2484   }
2485
2486   if (pings_in_flight_ > 0)
2487     return;
2488
2489   // We will record RTT in histogram when there are no more client sent
2490   // pings_in_flight_.
2491   RecordPingRTTHistogram(time_func_() - last_ping_sent_time_);
2492 }
2493
2494 void SpdySession::OnWindowUpdate(SpdyStreamId stream_id,
2495                                  uint32 delta_window_size) {
2496   CHECK(in_io_loop_);
2497
2498   DCHECK_LE(delta_window_size, static_cast<uint32>(kint32max));
2499   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_RECEIVED_WINDOW_UPDATE_FRAME,
2500                     base::Bind(&NetLogSpdyWindowUpdateFrameCallback, stream_id,
2501                                delta_window_size));
2502
2503   if (stream_id == kSessionFlowControlStreamId) {
2504     // WINDOW_UPDATE for the session.
2505     if (flow_control_state_ < FLOW_CONTROL_STREAM_AND_SESSION) {
2506       LOG(WARNING) << "Received WINDOW_UPDATE for session when "
2507                    << "session flow control is not turned on";
2508       // TODO(akalin): Record an error and close the session.
2509       return;
2510     }
2511
2512     if (delta_window_size < 1u) {
2513       RecordProtocolErrorHistogram(PROTOCOL_ERROR_INVALID_WINDOW_UPDATE_SIZE);
2514       DoDrainSession(
2515           ERR_SPDY_PROTOCOL_ERROR,
2516           "Received WINDOW_UPDATE with an invalid delta_window_size " +
2517               base::UintToString(delta_window_size));
2518       return;
2519     }
2520
2521     IncreaseSendWindowSize(static_cast<int32>(delta_window_size));
2522   } else {
2523     // WINDOW_UPDATE for a stream.
2524     if (flow_control_state_ < FLOW_CONTROL_STREAM) {
2525       // TODO(akalin): Record an error and close the session.
2526       LOG(WARNING) << "Received WINDOW_UPDATE for stream " << stream_id
2527                    << " when flow control is not turned on";
2528       return;
2529     }
2530
2531     ActiveStreamMap::iterator it = active_streams_.find(stream_id);
2532
2533     if (it == active_streams_.end()) {
2534       // NOTE:  it may just be that the stream was cancelled.
2535       LOG(WARNING) << "Received WINDOW_UPDATE for invalid stream " << stream_id;
2536       return;
2537     }
2538
2539     SpdyStream* stream = it->second.stream;
2540     CHECK_EQ(stream->stream_id(), stream_id);
2541
2542     if (delta_window_size < 1u) {
2543       ResetStreamIterator(it,
2544                           RST_STREAM_FLOW_CONTROL_ERROR,
2545                           base::StringPrintf(
2546                               "Received WINDOW_UPDATE with an invalid "
2547                               "delta_window_size %ud", delta_window_size));
2548       return;
2549     }
2550
2551     CHECK_EQ(it->second.stream->stream_id(), stream_id);
2552     it->second.stream->IncreaseSendWindowSize(
2553         static_cast<int32>(delta_window_size));
2554   }
2555 }
2556
2557 bool SpdySession::TryCreatePushStream(SpdyStreamId stream_id,
2558                                       SpdyStreamId associated_stream_id,
2559                                       SpdyPriority priority,
2560                                       const SpdyHeaderBlock& headers) {
2561   // Server-initiated streams should have even sequence numbers.
2562   if ((stream_id & 0x1) != 0) {
2563     LOG(WARNING) << "Received invalid push stream id " << stream_id;
2564     if (GetProtocolVersion() > SPDY2)
2565       CloseSessionOnError(ERR_SPDY_PROTOCOL_ERROR, "Odd push stream id.");
2566     return false;
2567   }
2568
2569   if (GetProtocolVersion() > SPDY2) {
2570     if (stream_id <= last_accepted_push_stream_id_) {
2571       LOG(WARNING) << "Received push stream id lesser or equal to the last "
2572                    << "accepted before " << stream_id;
2573       CloseSessionOnError(
2574           ERR_SPDY_PROTOCOL_ERROR,
2575           "New push stream id must be greater than the last accepted.");
2576       return false;
2577     }
2578   }
2579
2580   if (IsStreamActive(stream_id)) {
2581     // For SPDY3 and higher we should not get here, we'll start going away
2582     // earlier on |last_seen_push_stream_id_| check.
2583     CHECK_GT(SPDY3, GetProtocolVersion());
2584     LOG(WARNING) << "Received push for active stream " << stream_id;
2585     return false;
2586   }
2587
2588   last_accepted_push_stream_id_ = stream_id;
2589
2590   RequestPriority request_priority =
2591       ConvertSpdyPriorityToRequestPriority(priority, GetProtocolVersion());
2592
2593   if (availability_state_ == STATE_GOING_AWAY) {
2594     // TODO(akalin): This behavior isn't in the SPDY spec, although it
2595     // probably should be.
2596     EnqueueResetStreamFrame(stream_id,
2597                             request_priority,
2598                             RST_STREAM_REFUSED_STREAM,
2599                             "push stream request received when going away");
2600     return false;
2601   }
2602
2603   if (associated_stream_id == 0) {
2604     // In SPDY4 0 stream id in PUSH_PROMISE frame leads to framer error and
2605     // session going away. We should never get here.
2606     CHECK_GT(SPDY4, GetProtocolVersion());
2607     std::string description = base::StringPrintf(
2608         "Received invalid associated stream id %d for pushed stream %d",
2609         associated_stream_id,
2610         stream_id);
2611     EnqueueResetStreamFrame(
2612         stream_id, request_priority, RST_STREAM_REFUSED_STREAM, description);
2613     return false;
2614   }
2615
2616   streams_pushed_count_++;
2617
2618   // TODO(mbelshe): DCHECK that this is a GET method?
2619
2620   // Verify that the response had a URL for us.
2621   GURL gurl = GetUrlFromHeaderBlock(headers, GetProtocolVersion(), true);
2622   if (!gurl.is_valid()) {
2623     EnqueueResetStreamFrame(stream_id,
2624                             request_priority,
2625                             RST_STREAM_PROTOCOL_ERROR,
2626                             "Pushed stream url was invalid: " + gurl.spec());
2627     return false;
2628   }
2629
2630   // Verify we have a valid stream association.
2631   ActiveStreamMap::iterator associated_it =
2632       active_streams_.find(associated_stream_id);
2633   if (associated_it == active_streams_.end()) {
2634     EnqueueResetStreamFrame(
2635         stream_id,
2636         request_priority,
2637         RST_STREAM_INVALID_STREAM,
2638         base::StringPrintf("Received push for inactive associated stream %d",
2639                            associated_stream_id));
2640     return false;
2641   }
2642
2643   // Check that the pushed stream advertises the same origin as its associated
2644   // stream. Bypass this check if and only if this session is with a SPDY proxy
2645   // that is trusted explicitly via the --trusted-spdy-proxy switch.
2646   if (trusted_spdy_proxy_.Equals(host_port_pair())) {
2647     // Disallow pushing of HTTPS content.
2648     if (gurl.SchemeIs("https")) {
2649       EnqueueResetStreamFrame(
2650           stream_id,
2651           request_priority,
2652           RST_STREAM_REFUSED_STREAM,
2653           base::StringPrintf("Rejected push of Cross Origin HTTPS content %d",
2654                              associated_stream_id));
2655     }
2656   } else {
2657     GURL associated_url(associated_it->second.stream->GetUrlFromHeaders());
2658     if (associated_url.GetOrigin() != gurl.GetOrigin()) {
2659       EnqueueResetStreamFrame(
2660           stream_id,
2661           request_priority,
2662           RST_STREAM_REFUSED_STREAM,
2663           base::StringPrintf("Rejected Cross Origin Push Stream %d",
2664                              associated_stream_id));
2665       return false;
2666     }
2667   }
2668
2669   // There should not be an existing pushed stream with the same path.
2670   PushedStreamMap::iterator pushed_it =
2671       unclaimed_pushed_streams_.lower_bound(gurl);
2672   if (pushed_it != unclaimed_pushed_streams_.end() &&
2673       pushed_it->first == gurl) {
2674     EnqueueResetStreamFrame(
2675         stream_id,
2676         request_priority,
2677         RST_STREAM_PROTOCOL_ERROR,
2678         "Received duplicate pushed stream with url: " + gurl.spec());
2679     return false;
2680   }
2681
2682   scoped_ptr<SpdyStream> stream(new SpdyStream(SPDY_PUSH_STREAM,
2683                                                GetWeakPtr(),
2684                                                gurl,
2685                                                request_priority,
2686                                                stream_initial_send_window_size_,
2687                                                stream_initial_recv_window_size_,
2688                                                net_log_));
2689   stream->set_stream_id(stream_id);
2690
2691   // In spdy4/http2 PUSH_PROMISE arrives on associated stream.
2692   if (associated_it != active_streams_.end() && GetProtocolVersion() >= SPDY4) {
2693     associated_it->second.stream->IncrementRawReceivedBytes(
2694         last_compressed_frame_len_);
2695   } else {
2696     stream->IncrementRawReceivedBytes(last_compressed_frame_len_);
2697   }
2698
2699   last_compressed_frame_len_ = 0;
2700
2701   PushedStreamMap::iterator inserted_pushed_it =
2702       unclaimed_pushed_streams_.insert(
2703           pushed_it,
2704           std::make_pair(gurl, PushedStreamInfo(stream_id, time_func_())));
2705   DCHECK(inserted_pushed_it != pushed_it);
2706   DeleteExpiredPushedStreams();
2707
2708   InsertActivatedStream(stream.Pass());
2709
2710   ActiveStreamMap::iterator active_it = active_streams_.find(stream_id);
2711   if (active_it == active_streams_.end()) {
2712     NOTREACHED();
2713     return false;
2714   }
2715
2716   active_it->second.stream->OnPushPromiseHeadersReceived(headers);
2717   DCHECK(active_it->second.stream->IsReservedRemote());
2718   num_pushed_streams_++;
2719   return true;
2720 }
2721
2722 void SpdySession::OnPushPromise(SpdyStreamId stream_id,
2723                                 SpdyStreamId promised_stream_id,
2724                                 const SpdyHeaderBlock& headers) {
2725   CHECK(in_io_loop_);
2726
2727   if (net_log_.IsLogging()) {
2728     net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_RECV_PUSH_PROMISE,
2729                       base::Bind(&NetLogSpdyPushPromiseReceivedCallback,
2730                                  &headers, stream_id, promised_stream_id));
2731   }
2732
2733   // Any priority will do.
2734   // TODO(baranovich): pass parent stream id priority?
2735   if (!TryCreatePushStream(promised_stream_id, stream_id, 0, headers))
2736     return;
2737 }
2738
2739 void SpdySession::SendStreamWindowUpdate(SpdyStreamId stream_id,
2740                                          uint32 delta_window_size) {
2741   CHECK_GE(flow_control_state_, FLOW_CONTROL_STREAM);
2742   ActiveStreamMap::const_iterator it = active_streams_.find(stream_id);
2743   CHECK(it != active_streams_.end());
2744   CHECK_EQ(it->second.stream->stream_id(), stream_id);
2745   SendWindowUpdateFrame(
2746       stream_id, delta_window_size, it->second.stream->priority());
2747 }
2748
2749 void SpdySession::SendInitialData() {
2750   DCHECK(enable_sending_initial_data_);
2751
2752   if (send_connection_header_prefix_) {
2753     DCHECK_GE(protocol_, kProtoSPDY4MinimumVersion);
2754     DCHECK_LE(protocol_, kProtoSPDY4MaximumVersion);
2755     scoped_ptr<SpdyFrame> connection_header_prefix_frame(
2756         new SpdyFrame(const_cast<char*>(kHttp2ConnectionHeaderPrefix),
2757                       kHttp2ConnectionHeaderPrefixSize,
2758                       false /* take_ownership */));
2759     // Count the prefix as part of the subsequent SETTINGS frame.
2760     EnqueueSessionWrite(HIGHEST, SETTINGS,
2761                         connection_header_prefix_frame.Pass());
2762   }
2763
2764   // First, notify the server about the settings they should use when
2765   // communicating with us.
2766   SettingsMap settings_map;
2767   // Create a new settings frame notifying the server of our
2768   // max concurrent streams and initial window size.
2769   settings_map[SETTINGS_MAX_CONCURRENT_STREAMS] =
2770       SettingsFlagsAndValue(SETTINGS_FLAG_NONE, kMaxConcurrentPushedStreams);
2771   if (flow_control_state_ >= FLOW_CONTROL_STREAM &&
2772       stream_initial_recv_window_size_ != GetInitialWindowSize(protocol_)) {
2773     settings_map[SETTINGS_INITIAL_WINDOW_SIZE] =
2774         SettingsFlagsAndValue(SETTINGS_FLAG_NONE,
2775                               stream_initial_recv_window_size_);
2776   }
2777   SendSettings(settings_map);
2778
2779   // Next, notify the server about our initial recv window size.
2780   if (flow_control_state_ == FLOW_CONTROL_STREAM_AND_SESSION) {
2781     // Bump up the receive window size to the real initial value. This
2782     // has to go here since the WINDOW_UPDATE frame sent by
2783     // IncreaseRecvWindowSize() call uses |buffered_spdy_framer_|.
2784     DCHECK_GT(kDefaultInitialRecvWindowSize, session_recv_window_size_);
2785     // This condition implies that |kDefaultInitialRecvWindowSize| -
2786     // |session_recv_window_size_| doesn't overflow.
2787     DCHECK_GT(session_recv_window_size_, 0);
2788     IncreaseRecvWindowSize(
2789         kDefaultInitialRecvWindowSize - session_recv_window_size_);
2790   }
2791
2792   if (protocol_ <= kProtoSPDY31) {
2793     // Finally, notify the server about the settings they have
2794     // previously told us to use when communicating with them (after
2795     // applying them).
2796     const SettingsMap& server_settings_map =
2797         http_server_properties_->GetSpdySettings(host_port_pair());
2798     if (server_settings_map.empty())
2799       return;
2800
2801     SettingsMap::const_iterator it =
2802         server_settings_map.find(SETTINGS_CURRENT_CWND);
2803     uint32 cwnd = (it != server_settings_map.end()) ? it->second.second : 0;
2804     UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwndSent", cwnd, 1, 200, 100);
2805
2806     for (SettingsMap::const_iterator it = server_settings_map.begin();
2807          it != server_settings_map.end(); ++it) {
2808       const SpdySettingsIds new_id = it->first;
2809       const uint32 new_val = it->second.second;
2810       HandleSetting(new_id, new_val);
2811     }
2812
2813     SendSettings(server_settings_map);
2814   }
2815 }
2816
2817
2818 void SpdySession::SendSettings(const SettingsMap& settings) {
2819   const SpdyMajorVersion protocol_version = GetProtocolVersion();
2820   net_log_.AddEvent(
2821       NetLog::TYPE_HTTP2_SESSION_SEND_SETTINGS,
2822       base::Bind(&NetLogSpdySendSettingsCallback, &settings, protocol_version));
2823   // Create the SETTINGS frame and send it.
2824   DCHECK(buffered_spdy_framer_.get());
2825   scoped_ptr<SpdyFrame> settings_frame(
2826       buffered_spdy_framer_->CreateSettings(settings));
2827   sent_settings_ = true;
2828   EnqueueSessionWrite(HIGHEST, SETTINGS, settings_frame.Pass());
2829 }
2830
2831 void SpdySession::HandleSetting(uint32 id, uint32 value) {
2832   switch (id) {
2833     case SETTINGS_MAX_CONCURRENT_STREAMS:
2834       max_concurrent_streams_ = std::min(static_cast<size_t>(value),
2835                                          kMaxConcurrentStreamLimit);
2836       ProcessPendingStreamRequests();
2837       break;
2838     case SETTINGS_INITIAL_WINDOW_SIZE: {
2839       if (flow_control_state_ < FLOW_CONTROL_STREAM) {
2840         net_log().AddEvent(
2841             NetLog::TYPE_HTTP2_SESSION_INITIAL_WINDOW_SIZE_NO_FLOW_CONTROL);
2842         return;
2843       }
2844
2845       if (value > static_cast<uint32>(kint32max)) {
2846         net_log().AddEvent(
2847             NetLog::TYPE_HTTP2_SESSION_INITIAL_WINDOW_SIZE_OUT_OF_RANGE,
2848             NetLog::IntegerCallback("initial_window_size", value));
2849         return;
2850       }
2851
2852       // SETTINGS_INITIAL_WINDOW_SIZE updates initial_send_window_size_ only.
2853       int32 delta_window_size =
2854           static_cast<int32>(value) - stream_initial_send_window_size_;
2855       stream_initial_send_window_size_ = static_cast<int32>(value);
2856       UpdateStreamsSendWindowSize(delta_window_size);
2857       net_log().AddEvent(
2858           NetLog::TYPE_HTTP2_SESSION_UPDATE_STREAMS_SEND_WINDOW_SIZE,
2859           NetLog::IntegerCallback("delta_window_size", delta_window_size));
2860       break;
2861     }
2862   }
2863 }
2864
2865 void SpdySession::UpdateStreamsSendWindowSize(int32 delta_window_size) {
2866   DCHECK_GE(flow_control_state_, FLOW_CONTROL_STREAM);
2867   for (ActiveStreamMap::iterator it = active_streams_.begin();
2868        it != active_streams_.end(); ++it) {
2869     it->second.stream->AdjustSendWindowSize(delta_window_size);
2870   }
2871
2872   for (CreatedStreamSet::const_iterator it = created_streams_.begin();
2873        it != created_streams_.end(); it++) {
2874     (*it)->AdjustSendWindowSize(delta_window_size);
2875   }
2876 }
2877
2878 void SpdySession::SendPrefacePingIfNoneInFlight() {
2879   if (pings_in_flight_ || !enable_ping_based_connection_checking_)
2880     return;
2881
2882   base::TimeTicks now = time_func_();
2883   // If there is no activity in the session, then send a preface-PING.
2884   if ((now - last_activity_time_) > connection_at_risk_of_loss_time_)
2885     SendPrefacePing();
2886 }
2887
2888 void SpdySession::SendPrefacePing() {
2889   WritePingFrame(next_ping_id_, false);
2890 }
2891
2892 void SpdySession::SendWindowUpdateFrame(SpdyStreamId stream_id,
2893                                         uint32 delta_window_size,
2894                                         RequestPriority priority) {
2895   CHECK_GE(flow_control_state_, FLOW_CONTROL_STREAM);
2896   ActiveStreamMap::const_iterator it = active_streams_.find(stream_id);
2897   if (it != active_streams_.end()) {
2898     CHECK_EQ(it->second.stream->stream_id(), stream_id);
2899   } else {
2900     CHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
2901     CHECK_EQ(stream_id, kSessionFlowControlStreamId);
2902   }
2903
2904   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_SENT_WINDOW_UPDATE_FRAME,
2905                     base::Bind(&NetLogSpdyWindowUpdateFrameCallback, stream_id,
2906                                delta_window_size));
2907
2908   DCHECK(buffered_spdy_framer_.get());
2909   scoped_ptr<SpdyFrame> window_update_frame(
2910       buffered_spdy_framer_->CreateWindowUpdate(stream_id, delta_window_size));
2911   EnqueueSessionWrite(priority, WINDOW_UPDATE, window_update_frame.Pass());
2912 }
2913
2914 void SpdySession::WritePingFrame(SpdyPingId unique_id, bool is_ack) {
2915   DCHECK(buffered_spdy_framer_.get());
2916   scoped_ptr<SpdyFrame> ping_frame(
2917       buffered_spdy_framer_->CreatePingFrame(unique_id, is_ack));
2918   EnqueueSessionWrite(HIGHEST, PING, ping_frame.Pass());
2919
2920   if (net_log().IsLogging()) {
2921     net_log().AddEvent(
2922         NetLog::TYPE_HTTP2_SESSION_PING,
2923         base::Bind(&NetLogSpdyPingCallback, unique_id, is_ack, "sent"));
2924   }
2925   if (!is_ack) {
2926     next_ping_id_ += 2;
2927     ++pings_in_flight_;
2928     PlanToCheckPingStatus();
2929     last_ping_sent_time_ = time_func_();
2930   }
2931 }
2932
2933 void SpdySession::PlanToCheckPingStatus() {
2934   if (check_ping_status_pending_)
2935     return;
2936
2937   check_ping_status_pending_ = true;
2938   base::MessageLoop::current()->PostDelayedTask(
2939       FROM_HERE,
2940       base::Bind(&SpdySession::CheckPingStatus, weak_factory_.GetWeakPtr(),
2941                  time_func_()), hung_interval_);
2942 }
2943
2944 void SpdySession::CheckPingStatus(base::TimeTicks last_check_time) {
2945   CHECK(!in_io_loop_);
2946
2947   // Check if we got a response back for all PINGs we had sent.
2948   if (pings_in_flight_ == 0) {
2949     check_ping_status_pending_ = false;
2950     return;
2951   }
2952
2953   DCHECK(check_ping_status_pending_);
2954
2955   base::TimeTicks now = time_func_();
2956   base::TimeDelta delay = hung_interval_ - (now - last_activity_time_);
2957
2958   if (delay.InMilliseconds() < 0 || last_activity_time_ < last_check_time) {
2959     // Track all failed PING messages in a separate bucket.
2960     RecordPingRTTHistogram(base::TimeDelta::Max());
2961     DoDrainSession(ERR_SPDY_PING_FAILED, "Failed ping.");
2962     return;
2963   }
2964
2965   // Check the status of connection after a delay.
2966   base::MessageLoop::current()->PostDelayedTask(
2967       FROM_HERE,
2968       base::Bind(&SpdySession::CheckPingStatus, weak_factory_.GetWeakPtr(),
2969                  now),
2970       delay);
2971 }
2972
2973 void SpdySession::RecordPingRTTHistogram(base::TimeDelta duration) {
2974   UMA_HISTOGRAM_TIMES("Net.SpdyPing.RTT", duration);
2975 }
2976
2977 void SpdySession::RecordProtocolErrorHistogram(
2978     SpdyProtocolErrorDetails details) {
2979   UMA_HISTOGRAM_ENUMERATION("Net.SpdySessionErrorDetails2", details,
2980                             NUM_SPDY_PROTOCOL_ERROR_DETAILS);
2981   if (EndsWith(host_port_pair().host(), "google.com", false)) {
2982     UMA_HISTOGRAM_ENUMERATION("Net.SpdySessionErrorDetails_Google2", details,
2983                               NUM_SPDY_PROTOCOL_ERROR_DETAILS);
2984   }
2985 }
2986
2987 void SpdySession::RecordHistograms() {
2988   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdyStreamsPerSession",
2989                               streams_initiated_count_,
2990                               0, 300, 50);
2991   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdyStreamsPushedPerSession",
2992                               streams_pushed_count_,
2993                               0, 300, 50);
2994   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdyStreamsPushedAndClaimedPerSession",
2995                               streams_pushed_and_claimed_count_,
2996                               0, 300, 50);
2997   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdyStreamsAbandonedPerSession",
2998                               streams_abandoned_count_,
2999                               0, 300, 50);
3000   UMA_HISTOGRAM_ENUMERATION("Net.SpdySettingsSent",
3001                             sent_settings_ ? 1 : 0, 2);
3002   UMA_HISTOGRAM_ENUMERATION("Net.SpdySettingsReceived",
3003                             received_settings_ ? 1 : 0, 2);
3004   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdyStreamStallsPerSession",
3005                               stalled_streams_,
3006                               0, 300, 50);
3007   UMA_HISTOGRAM_ENUMERATION("Net.SpdySessionsWithStalls",
3008                             stalled_streams_ > 0 ? 1 : 0, 2);
3009
3010   if (received_settings_) {
3011     // Enumerate the saved settings, and set histograms for it.
3012     const SettingsMap& settings_map =
3013         http_server_properties_->GetSpdySettings(host_port_pair());
3014
3015     SettingsMap::const_iterator it;
3016     for (it = settings_map.begin(); it != settings_map.end(); ++it) {
3017       const SpdySettingsIds id = it->first;
3018       const uint32 val = it->second.second;
3019       switch (id) {
3020         case SETTINGS_CURRENT_CWND:
3021           // Record several different histograms to see if cwnd converges
3022           // for larger volumes of data being sent.
3023           UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwnd",
3024                                       val, 1, 200, 100);
3025           if (total_bytes_received_ > 10 * 1024) {
3026             UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwnd10K",
3027                                         val, 1, 200, 100);
3028             if (total_bytes_received_ > 25 * 1024) {
3029               UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwnd25K",
3030                                           val, 1, 200, 100);
3031               if (total_bytes_received_ > 50 * 1024) {
3032                 UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwnd50K",
3033                                             val, 1, 200, 100);
3034                 if (total_bytes_received_ > 100 * 1024) {
3035                   UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsCwnd100K",
3036                                               val, 1, 200, 100);
3037                 }
3038               }
3039             }
3040           }
3041           break;
3042         case SETTINGS_ROUND_TRIP_TIME:
3043           UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsRTT",
3044                                       val, 1, 1200, 100);
3045           break;
3046         case SETTINGS_DOWNLOAD_RETRANS_RATE:
3047           UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SpdySettingsRetransRate",
3048                                       val, 1, 100, 50);
3049           break;
3050         default:
3051           break;
3052       }
3053     }
3054   }
3055 }
3056
3057 void SpdySession::CompleteStreamRequest(
3058     const base::WeakPtr<SpdyStreamRequest>& pending_request) {
3059   // Abort if the request has already been cancelled.
3060   if (!pending_request)
3061     return;
3062
3063   base::WeakPtr<SpdyStream> stream;
3064   int rv = TryCreateStream(pending_request, &stream);
3065
3066   if (rv == OK) {
3067     DCHECK(stream);
3068     pending_request->OnRequestCompleteSuccess(stream);
3069     return;
3070   }
3071   DCHECK(!stream);
3072
3073   if (rv != ERR_IO_PENDING) {
3074     pending_request->OnRequestCompleteFailure(rv);
3075   }
3076 }
3077
3078 SSLClientSocket* SpdySession::GetSSLClientSocket() const {
3079   if (!is_secure_)
3080     return NULL;
3081   SSLClientSocket* ssl_socket =
3082       reinterpret_cast<SSLClientSocket*>(connection_->socket());
3083   DCHECK(ssl_socket);
3084   return ssl_socket;
3085 }
3086
3087 void SpdySession::OnWriteBufferConsumed(
3088     size_t frame_payload_size,
3089     size_t consume_size,
3090     SpdyBuffer::ConsumeSource consume_source) {
3091   // We can be called with |in_io_loop_| set if a write SpdyBuffer is
3092   // deleted (e.g., a stream is closed due to incoming data).
3093
3094   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3095
3096   if (consume_source == SpdyBuffer::DISCARD) {
3097     // If we're discarding a frame or part of it, increase the send
3098     // window by the number of discarded bytes. (Although if we're
3099     // discarding part of a frame, it's probably because of a write
3100     // error and we'll be tearing down the session soon.)
3101     size_t remaining_payload_bytes = std::min(consume_size, frame_payload_size);
3102     DCHECK_GT(remaining_payload_bytes, 0u);
3103     IncreaseSendWindowSize(static_cast<int32>(remaining_payload_bytes));
3104   }
3105   // For consumed bytes, the send window is increased when we receive
3106   // a WINDOW_UPDATE frame.
3107 }
3108
3109 void SpdySession::IncreaseSendWindowSize(int32 delta_window_size) {
3110   // We can be called with |in_io_loop_| set if a SpdyBuffer is
3111   // deleted (e.g., a stream is closed due to incoming data).
3112
3113   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3114   DCHECK_GE(delta_window_size, 1);
3115
3116   // Check for overflow.
3117   int32 max_delta_window_size = kint32max - session_send_window_size_;
3118   if (delta_window_size > max_delta_window_size) {
3119     RecordProtocolErrorHistogram(PROTOCOL_ERROR_INVALID_WINDOW_UPDATE_SIZE);
3120     DoDrainSession(
3121         ERR_SPDY_PROTOCOL_ERROR,
3122         "Received WINDOW_UPDATE [delta: " +
3123             base::IntToString(delta_window_size) +
3124             "] for session overflows session_send_window_size_ [current: " +
3125             base::IntToString(session_send_window_size_) + "]");
3126     return;
3127   }
3128
3129   session_send_window_size_ += delta_window_size;
3130
3131   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_UPDATE_SEND_WINDOW,
3132                     base::Bind(&NetLogSpdySessionWindowUpdateCallback,
3133                                delta_window_size, session_send_window_size_));
3134
3135   DCHECK(!IsSendStalled());
3136   ResumeSendStalledStreams();
3137 }
3138
3139 void SpdySession::DecreaseSendWindowSize(int32 delta_window_size) {
3140   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3141
3142   // We only call this method when sending a frame. Therefore,
3143   // |delta_window_size| should be within the valid frame size range.
3144   DCHECK_GE(delta_window_size, 1);
3145   DCHECK_LE(delta_window_size, kMaxSpdyFrameChunkSize);
3146
3147   // |send_window_size_| should have been at least |delta_window_size| for
3148   // this call to happen.
3149   DCHECK_GE(session_send_window_size_, delta_window_size);
3150
3151   session_send_window_size_ -= delta_window_size;
3152
3153   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_UPDATE_SEND_WINDOW,
3154                     base::Bind(&NetLogSpdySessionWindowUpdateCallback,
3155                                -delta_window_size, session_send_window_size_));
3156 }
3157
3158 void SpdySession::OnReadBufferConsumed(
3159     size_t consume_size,
3160     SpdyBuffer::ConsumeSource consume_source) {
3161   // We can be called with |in_io_loop_| set if a read SpdyBuffer is
3162   // deleted (e.g., discarded by a SpdyReadQueue).
3163
3164   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3165   DCHECK_GE(consume_size, 1u);
3166   DCHECK_LE(consume_size, static_cast<size_t>(kint32max));
3167
3168   IncreaseRecvWindowSize(static_cast<int32>(consume_size));
3169 }
3170
3171 void SpdySession::IncreaseRecvWindowSize(int32 delta_window_size) {
3172   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3173   DCHECK_GE(session_unacked_recv_window_bytes_, 0);
3174   DCHECK_GE(session_recv_window_size_, session_unacked_recv_window_bytes_);
3175   DCHECK_GE(delta_window_size, 1);
3176   // Check for overflow.
3177   DCHECK_LE(delta_window_size, kint32max - session_recv_window_size_);
3178
3179   session_recv_window_size_ += delta_window_size;
3180   net_log_.AddEvent(NetLog::TYPE_HTTP2_STREAM_UPDATE_RECV_WINDOW,
3181                     base::Bind(&NetLogSpdySessionWindowUpdateCallback,
3182                                delta_window_size, session_recv_window_size_));
3183
3184   session_unacked_recv_window_bytes_ += delta_window_size;
3185   if (session_unacked_recv_window_bytes_ >
3186       GetInitialWindowSize(protocol_) / 2) {
3187     SendWindowUpdateFrame(kSessionFlowControlStreamId,
3188                           session_unacked_recv_window_bytes_,
3189                           HIGHEST);
3190     session_unacked_recv_window_bytes_ = 0;
3191   }
3192 }
3193
3194 void SpdySession::DecreaseRecvWindowSize(int32 delta_window_size) {
3195   CHECK(in_io_loop_);
3196   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3197   DCHECK_GE(delta_window_size, 1);
3198
3199   // Since we never decrease the initial receive window size,
3200   // |delta_window_size| should never cause |recv_window_size_| to go
3201   // negative. If we do, the receive window isn't being respected.
3202   if (delta_window_size > session_recv_window_size_) {
3203     RecordProtocolErrorHistogram(PROTOCOL_ERROR_RECEIVE_WINDOW_VIOLATION);
3204     DoDrainSession(
3205         ERR_SPDY_FLOW_CONTROL_ERROR,
3206         "delta_window_size is " + base::IntToString(delta_window_size) +
3207             " in DecreaseRecvWindowSize, which is larger than the receive " +
3208             "window size of " + base::IntToString(session_recv_window_size_));
3209     return;
3210   }
3211
3212   session_recv_window_size_ -= delta_window_size;
3213   net_log_.AddEvent(NetLog::TYPE_HTTP2_SESSION_UPDATE_RECV_WINDOW,
3214                     base::Bind(&NetLogSpdySessionWindowUpdateCallback,
3215                                -delta_window_size, session_recv_window_size_));
3216 }
3217
3218 void SpdySession::QueueSendStalledStream(const SpdyStream& stream) {
3219   DCHECK(stream.send_stalled_by_flow_control());
3220   RequestPriority priority = stream.priority();
3221   CHECK_GE(priority, MINIMUM_PRIORITY);
3222   CHECK_LE(priority, MAXIMUM_PRIORITY);
3223   stream_send_unstall_queue_[priority].push_back(stream.stream_id());
3224 }
3225
3226 void SpdySession::ResumeSendStalledStreams() {
3227   DCHECK_EQ(flow_control_state_, FLOW_CONTROL_STREAM_AND_SESSION);
3228
3229   // We don't have to worry about new streams being queued, since
3230   // doing so would cause IsSendStalled() to return true. But we do
3231   // have to worry about streams being closed, as well as ourselves
3232   // being closed.
3233
3234   while (!IsSendStalled()) {
3235     size_t old_size = 0;
3236 #if DCHECK_IS_ON()
3237     old_size = GetTotalSize(stream_send_unstall_queue_);
3238 #endif
3239
3240     SpdyStreamId stream_id = PopStreamToPossiblyResume();
3241     if (stream_id == 0)
3242       break;
3243     ActiveStreamMap::const_iterator it = active_streams_.find(stream_id);
3244     // The stream may actually still be send-stalled after this (due
3245     // to its own send window) but that's okay -- it'll then be
3246     // resumed once its send window increases.
3247     if (it != active_streams_.end())
3248       it->second.stream->PossiblyResumeIfSendStalled();
3249
3250     // The size should decrease unless we got send-stalled again.
3251     if (!IsSendStalled())
3252       DCHECK_LT(GetTotalSize(stream_send_unstall_queue_), old_size);
3253   }
3254 }
3255
3256 SpdyStreamId SpdySession::PopStreamToPossiblyResume() {
3257   for (int i = MAXIMUM_PRIORITY; i >= MINIMUM_PRIORITY; --i) {
3258     std::deque<SpdyStreamId>* queue = &stream_send_unstall_queue_[i];
3259     if (!queue->empty()) {
3260       SpdyStreamId stream_id = queue->front();
3261       queue->pop_front();
3262       return stream_id;
3263     }
3264   }
3265   return 0;
3266 }
3267
3268 }  // namespace net