blob: 1fa0c7aabc83a5a7345688509560d8ab0b51005d [file] [log] [blame]
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/spdy/spdy_session_pool.h"
#include <algorithm>
#include <utility>
#include "base/bind.h"
#include "base/logging.h"
#include "base/metrics/histogram_macros.h"
#include "base/stl_util.h"
#include "base/strings/stringprintf.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/trace_event/memory_allocator_dump.h"
#include "base/trace_event/memory_usage_estimator.h"
#include "base/trace_event/process_memory_dump.h"
#include "base/trace_event/trace_event.h"
#include "base/values.h"
#include "build/build_config.h"
#include "net/base/address_list.h"
#include "net/base/trace_constants.h"
#include "net/dns/host_resolver.h"
#include "net/dns/host_resolver_source.h"
#include "net/http/http_network_session.h"
#include "net/http/http_server_properties.h"
#include "net/http/http_stream_request.h"
#include "net/log/net_log_event_type.h"
#include "net/log/net_log_source.h"
#include "net/log/net_log_with_source.h"
#include "net/socket/client_socket_handle.h"
#include "net/spdy/spdy_session.h"
#include "net/third_party/quiche/src/spdy/core/hpack/hpack_constants.h"
#include "net/third_party/quiche/src/spdy/core/hpack/hpack_huffman_table.h"
#include "net/third_party/quiche/src/spdy/core/hpack/hpack_static_table.h"
namespace net {
namespace {
enum SpdySessionGetTypes {
CREATED_NEW = 0,
FOUND_EXISTING = 1,
FOUND_EXISTING_FROM_IP_POOL = 2,
IMPORTED_FROM_SOCKET = 3,
SPDY_SESSION_GET_MAX = 4
};
} // namespace
SpdySessionPool::SpdySessionRequest::Delegate::Delegate() = default;
SpdySessionPool::SpdySessionRequest::Delegate::~Delegate() = default;
SpdySessionPool::SpdySessionRequest::SpdySessionRequest(
const SpdySessionKey& key,
Delegate* delegate,
SpdySessionPool* spdy_session_pool)
: key_(key), delegate_(delegate), spdy_session_pool_(spdy_session_pool) {}
SpdySessionPool::SpdySessionRequest::~SpdySessionRequest() {
if (spdy_session_pool_)
spdy_session_pool_->RemoveRequestForSpdySession(this);
}
void SpdySessionPool::SpdySessionRequest::OnRemovedFromPool() {
DCHECK(spdy_session_pool_);
spdy_session_pool_ = nullptr;
}
SpdySessionPool::SpdySessionPool(
HostResolver* resolver,
SSLConfigService* ssl_config_service,
HttpServerProperties* http_server_properties,
TransportSecurityState* transport_security_state,
const quic::QuicTransportVersionVector& quic_supported_versions,
bool enable_ping_based_connection_checking,
bool support_ietf_format_quic_altsvc,
size_t session_max_recv_window_size,
const spdy::SettingsMap& initial_settings,
const base::Optional<GreasedHttp2Frame>& greased_http2_frame,
SpdySessionPool::TimeFunc time_func,
NetworkQualityEstimator* network_quality_estimator)
: http_server_properties_(http_server_properties),
transport_security_state_(transport_security_state),
ssl_config_service_(ssl_config_service),
resolver_(resolver),
quic_supported_versions_(quic_supported_versions),
enable_sending_initial_data_(true),
enable_ping_based_connection_checking_(
enable_ping_based_connection_checking),
support_ietf_format_quic_altsvc_(support_ietf_format_quic_altsvc),
session_max_recv_window_size_(session_max_recv_window_size),
initial_settings_(initial_settings),
greased_http2_frame_(greased_http2_frame),
time_func_(time_func),
push_delegate_(nullptr),
network_quality_estimator_(network_quality_estimator),
weak_ptr_factory_(this) {
NetworkChangeNotifier::AddIPAddressObserver(this);
if (ssl_config_service_)
ssl_config_service_->AddObserver(this);
CertDatabase::GetInstance()->AddObserver(this);
}
SpdySessionPool::~SpdySessionPool() {
DCHECK(spdy_session_request_map_.empty());
// TODO(bnc): CloseAllSessions() is also called in HttpNetworkSession
// destructor, one of the two calls should be removed.
CloseAllSessions();
while (!sessions_.empty()) {
// Destroy sessions to enforce that lifetime is scoped to SpdySessionPool.
// Write callbacks queued upon session drain are not invoked.
RemoveUnavailableSession((*sessions_.begin())->GetWeakPtr());
}
if (ssl_config_service_)
ssl_config_service_->RemoveObserver(this);
NetworkChangeNotifier::RemoveIPAddressObserver(this);
CertDatabase::GetInstance()->RemoveObserver(this);
}
base::WeakPtr<SpdySession>
SpdySessionPool::CreateAvailableSessionFromSocketHandle(
const SpdySessionKey& key,
bool is_trusted_proxy,
std::unique_ptr<ClientSocketHandle> client_socket_handle,
const NetLogWithSource& net_log) {
TRACE_EVENT0(NetTracingCategory(),
"SpdySessionPool::CreateAvailableSessionFromSocketHandle");
std::unique_ptr<SpdySession> new_session =
CreateSession(key, is_trusted_proxy, net_log.net_log());
new_session->InitializeWithSocketHandle(std::move(client_socket_handle),
this);
return InsertSession(key, std::move(new_session), net_log);
}
base::WeakPtr<SpdySession> SpdySessionPool::CreateAvailableSessionFromSocket(
const SpdySessionKey& key,
bool is_trusted_proxy,
std::unique_ptr<StreamSocket> socket_stream,
const LoadTimingInfo::ConnectTiming& connect_timing,
const NetLogWithSource& net_log) {
TRACE_EVENT0(NetTracingCategory(),
"SpdySessionPool::CreateAvailableSessionFromSocket");
std::unique_ptr<SpdySession> new_session =
CreateSession(key, is_trusted_proxy, net_log.net_log());
new_session->InitializeWithSocket(std::move(socket_stream), connect_timing,
this);
return InsertSession(key, std::move(new_session), net_log);
}
base::WeakPtr<SpdySession> SpdySessionPool::FindAvailableSession(
const SpdySessionKey& key,
bool enable_ip_based_pooling,
bool is_websocket,
const NetLogWithSource& net_log) {
auto it = LookupAvailableSessionByKey(key);
if (it != available_sessions_.end() &&
(!is_websocket || it->second->support_websocket())) {
if (key == it->second->spdy_session_key()) {
UMA_HISTOGRAM_ENUMERATION("Net.SpdySessionGet", FOUND_EXISTING,
SPDY_SESSION_GET_MAX);
net_log.AddEvent(
NetLogEventType::HTTP2_SESSION_POOL_FOUND_EXISTING_SESSION,
it->second->net_log().source().ToEventParametersCallback());
return it->second;
}
if (enable_ip_based_pooling) {
UMA_HISTOGRAM_ENUMERATION("Net.SpdySessionGet",
FOUND_EXISTING_FROM_IP_POOL,
SPDY_SESSION_GET_MAX);
net_log.AddEvent(
NetLogEventType::
HTTP2_SESSION_POOL_FOUND_EXISTING_SESSION_FROM_IP_POOL,
it->second->net_log().source().ToEventParametersCallback());
return it->second;
}
// Remove session from available sessions and from aliases, and remove
// key from the session's pooled alias set, so that a new session can be
// created with this |key|.
it->second->RemovePooledAlias(key);
UnmapKey(key);
RemoveAliases(key);
return base::WeakPtr<SpdySession>();
}
if (!enable_ip_based_pooling)
return base::WeakPtr<SpdySession>();
// Look up IP addresses from resolver cache.
HostResolver::ResolveHostParameters parameters;
parameters.source = HostResolverSource::LOCAL_ONLY;
std::unique_ptr<HostResolver::ResolveHostRequest> request =
resolver_->CreateRequest(key.host_port_pair(), net_log, parameters);
int rv = request->Start(base::BindOnce([](int error) { NOTREACHED(); }));
DCHECK_NE(rv, ERR_IO_PENDING);
if (rv != OK)
return base::WeakPtr<SpdySession>();
// Check if we have a session through a domain alias.
for (const auto& address : request->GetAddressResults().value().endpoints()) {
auto range = aliases_.equal_range(address);
for (auto alias_it = range.first; alias_it != range.second; ++alias_it) {
// We found an alias.
const SpdySessionKey& alias_key = alias_it->second;
// We can reuse this session only if the proxy and privacy
// settings match.
if (!(alias_key.proxy_server() == key.proxy_server()) ||
!(alias_key.privacy_mode() == key.privacy_mode()) ||
!(alias_key.is_proxy_session() == key.is_proxy_session())) {
continue;
}
auto available_session_it = LookupAvailableSessionByKey(alias_key);
if (available_session_it == available_sessions_.end()) {
NOTREACHED(); // It shouldn't be in the aliases table if we can't get
// it!
continue;
}
// Make copy of WeakPtr as call to UnmapKey() will delete original.
const base::WeakPtr<SpdySession> available_session =
available_session_it->second;
DCHECK(base::ContainsKey(sessions_, available_session.get()));
if (is_websocket && !available_session->support_websocket())
continue;
// If the session is a secure one, we need to verify that the
// server is authenticated to serve traffic for |host_port_proxy_pair|
// too.
if (!available_session->VerifyDomainAuthentication(
key.host_port_pair().host())) {
UMA_HISTOGRAM_ENUMERATION("Net.SpdyIPPoolDomainMatch", 0, 2);
continue;
}
bool adding_pooled_alias = true;
// If socket tags differ, see if session's socket tag can be changed.
if (alias_key.socket_tag() != key.socket_tag()) {
SpdySessionKey old_key = available_session->spdy_session_key();
if (!available_session->ChangeSocketTag(key.socket_tag()))
continue;
const SpdySessionKey& new_key = available_session->spdy_session_key();
// This isn't a pooled alias, it's the actual session.
adding_pooled_alias = false;
// Remap main session key.
UnmapKey(old_key);
MapKeyToAvailableSession(new_key, available_session);
// Remap alias.
aliases_.insert(AliasMap::value_type(alias_it->first, new_key));
aliases_.erase(alias_it);
// Remap pooled session keys.
const auto& aliases = available_session->pooled_aliases();
for (auto it = aliases.begin(); it != aliases.end();) {
// Ignore aliases this loop is inserting.
if (it->socket_tag() == key.socket_tag()) {
++it;
continue;
}
UnmapKey(*it);
SpdySessionKey new_pool_alias_key = SpdySessionKey(
it->host_port_pair(), it->proxy_server(), it->privacy_mode(),
it->is_proxy_session(), key.socket_tag());
MapKeyToAvailableSession(new_pool_alias_key, available_session);
auto old_it = it;
++it;
available_session->RemovePooledAlias(*old_it);
available_session->AddPooledAlias(new_pool_alias_key);
}
}
UMA_HISTOGRAM_ENUMERATION("Net.SpdyIPPoolDomainMatch", 1, 2);
UMA_HISTOGRAM_ENUMERATION("Net.SpdySessionGet",
FOUND_EXISTING_FROM_IP_POOL,
SPDY_SESSION_GET_MAX);
net_log.AddEvent(
NetLogEventType::
HTTP2_SESSION_POOL_FOUND_EXISTING_SESSION_FROM_IP_POOL,
available_session->net_log().source().ToEventParametersCallback());
if (adding_pooled_alias) {
// Add this session to the map so that we can find it next time.
MapKeyToAvailableSession(key, available_session);
available_session->AddPooledAlias(key);
}
return available_session;
}
}
return base::WeakPtr<SpdySession>();
}
base::WeakPtr<SpdySession> SpdySessionPool::RequestSession(
const SpdySessionKey& key,
bool enable_ip_based_pooling,
bool is_websocket,
const NetLogWithSource& net_log,
base::RepeatingClosure on_request_destroyed_callback,
SpdySessionRequest::Delegate* delegate,
std::unique_ptr<SpdySessionRequest>* spdy_session_request,
bool* is_first_request_for_session) {
DCHECK(delegate);
base::WeakPtr<SpdySession> spdy_session =
FindAvailableSession(key, enable_ip_based_pooling, is_websocket, net_log);
if (spdy_session) {
// This value doesn't really matter, but best to always populate it, for
// consistency.
*is_first_request_for_session = true;
return spdy_session;
}
RequestSet* request_set = &spdy_session_request_map_[key];
*is_first_request_for_session = request_set->empty();
*spdy_session_request =
std::make_unique<SpdySessionRequest>(key, delegate, this);
request_set->insert(spdy_session_request->get());
if (on_request_destroyed_callback && !*is_first_request_for_session) {
spdy_session_pending_request_map_[key].push_back(
on_request_destroyed_callback);
}
return nullptr;
}
void SpdySessionPool::MakeSessionUnavailable(
const base::WeakPtr<SpdySession>& available_session) {
UnmapKey(available_session->spdy_session_key());
RemoveAliases(available_session->spdy_session_key());
const std::set<SpdySessionKey>& aliases = available_session->pooled_aliases();
for (auto it = aliases.begin(); it != aliases.end(); ++it) {
UnmapKey(*it);
RemoveAliases(*it);
}
DCHECK(!IsSessionAvailable(available_session));
}
void SpdySessionPool::RemoveUnavailableSession(
const base::WeakPtr<SpdySession>& unavailable_session) {
DCHECK(!IsSessionAvailable(unavailable_session));
unavailable_session->net_log().AddEvent(
NetLogEventType::HTTP2_SESSION_POOL_REMOVE_SESSION);
auto it = sessions_.find(unavailable_session.get());
CHECK(it != sessions_.end());
std::unique_ptr<SpdySession> owned_session(*it);
sessions_.erase(it);
}
// Make a copy of |sessions_| in the Close* functions below to avoid
// reentrancy problems. Since arbitrary functions get called by close
// handlers, it doesn't suffice to simply increment the iterator
// before closing.
void SpdySessionPool::CloseCurrentSessions(Error error) {
CloseCurrentSessionsHelper(error, "Closing current sessions.",
false /* idle_only */);
}
void SpdySessionPool::CloseCurrentIdleSessions() {
CloseCurrentSessionsHelper(ERR_ABORTED, "Closing idle sessions.",
true /* idle_only */);
}
void SpdySessionPool::CloseAllSessions() {
auto is_draining = [](const SpdySession* s) { return s->IsDraining(); };
// Repeat until every SpdySession owned by |this| is draining.
while (!std::all_of(sessions_.begin(), sessions_.end(), is_draining)) {
CloseCurrentSessionsHelper(ERR_ABORTED, "Closing all sessions.",
false /* idle_only */);
}
}
std::unique_ptr<base::Value> SpdySessionPool::SpdySessionPoolInfoToValue()
const {
auto list = std::make_unique<base::ListValue>();
for (auto it = available_sessions_.begin(); it != available_sessions_.end();
++it) {
// Only add the session if the key in the map matches the main
// host_port_proxy_pair (not an alias).
const SpdySessionKey& key = it->first;
const SpdySessionKey& session_key = it->second->spdy_session_key();
if (key == session_key)
list->Append(it->second->GetInfoAsValue());
}
return std::move(list);
}
void SpdySessionPool::OnIPAddressChanged() {
WeakSessionList current_sessions = GetCurrentSessions();
for (WeakSessionList::const_iterator it = current_sessions.begin();
it != current_sessions.end(); ++it) {
if (!*it)
continue;
// For OSs that terminate TCP connections upon relevant network changes,
// attempt to preserve active streams by marking all sessions as going
// away, rather than explicitly closing them. Streams may still fail due
// to a generated TCP reset.
#if defined(OS_ANDROID) || defined(OS_WIN) || defined(OS_IOS)
(*it)->MakeUnavailable();
(*it)->StartGoingAway(kLastStreamId, ERR_NETWORK_CHANGED);
(*it)->MaybeFinishGoingAway();
#else
(*it)->CloseSessionOnError(ERR_NETWORK_CHANGED,
"Closing current sessions.");
DCHECK((*it)->IsDraining());
#endif // defined(OS_ANDROID) || defined(OS_WIN) || defined(OS_IOS)
DCHECK(!IsSessionAvailable(*it));
}
}
void SpdySessionPool::OnSSLConfigChanged() {
CloseCurrentSessions(ERR_NETWORK_CHANGED);
}
void SpdySessionPool::OnCertDBChanged() {
CloseCurrentSessions(ERR_CERT_DATABASE_CHANGED);
}
void SpdySessionPool::RemoveRequestForSpdySession(SpdySessionRequest* request) {
DCHECK_EQ(this, request->spdy_session_pool());
const SpdySessionKey& spdy_session_key = request->key();
// Resume all pending requests now that |request| is done/canceled.
if (spdy_session_pending_request_map_.find(spdy_session_key) !=
spdy_session_pending_request_map_.end()) {
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE,
base::BindOnce(&SpdySessionPool::UpdatePendingRequests,
weak_ptr_factory_.GetWeakPtr(), spdy_session_key));
}
auto iter = spdy_session_request_map_.find(spdy_session_key);
DCHECK(iter != spdy_session_request_map_.end());
RequestSet& request_set = iter->second;
DCHECK(base::ContainsKey(request_set, request));
RemoveRequestInternal(iter, request_set.find(request));
}
void SpdySessionPool::DumpMemoryStats(
base::trace_event::ProcessMemoryDump* pmd,
const std::string& parent_dump_absolute_name) const {
if (sessions_.empty())
return;
size_t total_size = 0;
size_t buffer_size = 0;
size_t cert_count = 0;
size_t cert_size = 0;
size_t num_active_sessions = 0;
for (auto* session : sessions_) {
StreamSocket::SocketMemoryStats stats;
bool is_session_active = false;
total_size += session->DumpMemoryStats(&stats, &is_session_active);
buffer_size += stats.buffer_size;
cert_count += stats.cert_count;
cert_size += stats.cert_size;
if (is_session_active)
num_active_sessions++;
}
total_size +=
base::trace_event::EstimateMemoryUsage(spdy::ObtainHpackHuffmanTable()) +
base::trace_event::EstimateMemoryUsage(spdy::ObtainHpackStaticTable()) +
base::trace_event::EstimateMemoryUsage(push_promise_index_);
base::trace_event::MemoryAllocatorDump* dump =
pmd->CreateAllocatorDump(base::StringPrintf(
"%s/spdy_session_pool", parent_dump_absolute_name.c_str()));
dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
total_size);
dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameObjectCount,
base::trace_event::MemoryAllocatorDump::kUnitsObjects,
sessions_.size());
dump->AddScalar("active_session_count",
base::trace_event::MemoryAllocatorDump::kUnitsObjects,
num_active_sessions);
dump->AddScalar("buffer_size",
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
buffer_size);
dump->AddScalar("cert_count",
base::trace_event::MemoryAllocatorDump::kUnitsObjects,
cert_count);
dump->AddScalar("cert_size",
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
cert_size);
}
bool SpdySessionPool::IsSessionAvailable(
const base::WeakPtr<SpdySession>& session) const {
for (auto it = available_sessions_.begin(); it != available_sessions_.end();
++it) {
if (it->second.get() == session.get())
return true;
}
return false;
}
void SpdySessionPool::MapKeyToAvailableSession(
const SpdySessionKey& key,
const base::WeakPtr<SpdySession>& session) {
DCHECK(base::ContainsKey(sessions_, session.get()));
std::pair<AvailableSessionMap::iterator, bool> result =
available_sessions_.insert(std::make_pair(key, session));
CHECK(result.second);
}
SpdySessionPool::AvailableSessionMap::iterator
SpdySessionPool::LookupAvailableSessionByKey(
const SpdySessionKey& key) {
return available_sessions_.find(key);
}
void SpdySessionPool::UnmapKey(const SpdySessionKey& key) {
auto it = LookupAvailableSessionByKey(key);
CHECK(it != available_sessions_.end());
available_sessions_.erase(it);
}
void SpdySessionPool::RemoveAliases(const SpdySessionKey& key) {
// Walk the aliases map, find references to this pair.
// TODO(mbelshe): Figure out if this is too expensive.
for (auto it = aliases_.begin(); it != aliases_.end();) {
if (it->second == key) {
auto old_it = it;
++it;
aliases_.erase(old_it);
} else {
++it;
}
}
}
SpdySessionPool::WeakSessionList SpdySessionPool::GetCurrentSessions() const {
WeakSessionList current_sessions;
for (auto it = sessions_.begin(); it != sessions_.end(); ++it) {
current_sessions.push_back((*it)->GetWeakPtr());
}
return current_sessions;
}
void SpdySessionPool::CloseCurrentSessionsHelper(Error error,
const std::string& description,
bool idle_only) {
WeakSessionList current_sessions = GetCurrentSessions();
for (base::WeakPtr<SpdySession>& session : current_sessions) {
if (!session)
continue;
if (idle_only && session->is_active())
continue;
if (session->IsDraining())
continue;
session->CloseSessionOnError(error, description);
DCHECK(!IsSessionAvailable(session));
DCHECK(!session || session->IsDraining());
}
}
std::unique_ptr<SpdySession> SpdySessionPool::CreateSession(
const SpdySessionKey& key,
bool is_trusted_proxy,
NetLog* net_log) {
UMA_HISTOGRAM_ENUMERATION("Net.SpdySessionGet", IMPORTED_FROM_SOCKET,
SPDY_SESSION_GET_MAX);
return std::make_unique<SpdySession>(
key, http_server_properties_, transport_security_state_,
ssl_config_service_, quic_supported_versions_,
enable_sending_initial_data_, enable_ping_based_connection_checking_,
support_ietf_format_quic_altsvc_, is_trusted_proxy,
session_max_recv_window_size_, initial_settings_, greased_http2_frame_,
time_func_, push_delegate_, network_quality_estimator_, net_log);
}
base::WeakPtr<SpdySession> SpdySessionPool::InsertSession(
const SpdySessionKey& key,
std::unique_ptr<SpdySession> new_session,
const NetLogWithSource& source_net_log) {
base::WeakPtr<SpdySession> available_session = new_session->GetWeakPtr();
sessions_.insert(new_session.release());
MapKeyToAvailableSession(key, available_session);
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::BindOnce(&SpdySessionPool::UpdatePendingRequests,
weak_ptr_factory_.GetWeakPtr(), key));
source_net_log.AddEvent(
NetLogEventType::HTTP2_SESSION_POOL_IMPORTED_SESSION_FROM_SOCKET,
available_session->net_log().source().ToEventParametersCallback());
// Look up the IP address for this session so that we can match
// future sessions (potentially to different domains) which can
// potentially be pooled with this one. Because GetPeerAddress()
// reports the proxy's address instead of the origin server, check
// to see if this is a direct connection.
if (key.proxy_server().is_direct()) {
IPEndPoint address;
if (available_session->GetPeerAddress(&address) == OK)
aliases_.insert(AliasMap::value_type(address, key));
}
return available_session;
}
void SpdySessionPool::UpdatePendingRequests(const SpdySessionKey& key) {
auto it = LookupAvailableSessionByKey(key);
if (it != available_sessions_.end()) {
base::WeakPtr<SpdySession> new_session = it->second->GetWeakPtr();
while (new_session && new_session->IsAvailable()) {
// Each iteration may empty out the RequestSet for |spdy_session_key| in
// |spdy_session_request_map_|. So each time, check for RequestSet and use
// the first one. Could just keep track if the last iteration removed the
// final request, but it's possible that responding to one request will
// result in cancelling another one.
//
// TODO(willchan): If it's important, switch RequestSet out for a FIFO
// queue (Order by priority first, then FIFO within same priority).
// Unclear that it matters here.
auto iter = spdy_session_request_map_.find(key);
if (iter == spdy_session_request_map_.end())
break;
RequestSet* request_set = &iter->second;
RequestSet::iterator request = request_set->begin();
SpdySessionRequest::Delegate* delegate = (*request)->delegate();
RemoveRequestInternal(iter, request);
delegate->OnSpdySessionAvailable(new_session);
}
}
auto iter = spdy_session_pending_request_map_.find(key);
if (iter == spdy_session_pending_request_map_.end())
return;
// Remove all pending requests, if there are any. As a result, if one of these
// callbacks triggers a new RequestSession() call,
// |is_first_request_for_session| will be true.
std::list<base::RepeatingClosure> pending_requests = std::move(iter->second);
spdy_session_pending_request_map_.erase(iter);
// Resume any pending requests. This needs to be after the
// OnSpdySessionAvailable() calls, to prevent requests from calling into the
// socket pools in cases where that's not necessary.
for (auto callback : pending_requests) {
callback.Run();
}
}
void SpdySessionPool::RemoveRequestInternal(
SpdySessionRequestMap::iterator request_map_iterator,
RequestSet::iterator request_set_iterator) {
SpdySessionRequest* request = *request_set_iterator;
request_map_iterator->second.erase(request_set_iterator);
if (request_map_iterator->second.empty())
spdy_session_request_map_.erase(request_map_iterator);
request->OnRemovedFromPool();
}
} // namespace net