blob: 40c6615617faa8529c030fc12a7da1a930a8e641 [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 <utility>
#include "base/logging.h"
#include "base/metrics/histogram_macros.h"
#include "base/profiler/scoped_tracker.h"
#include "base/stl_util.h"
#include "base/trace_event/trace_event.h"
#include "base/values.h"
#include "net/base/address_list.h"
#include "net/http/http_network_session.h"
#include "net/http/http_server_properties.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/spdy/spdy_session.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::SpdySessionPool(
HostResolver* resolver,
SSLConfigService* ssl_config_service,
HttpServerProperties* http_server_properties,
TransportSecurityState* transport_security_state,
bool enable_ping_based_connection_checking,
size_t session_max_recv_window_size,
size_t stream_max_recv_window_size,
SpdySessionPool::TimeFunc time_func,
ProxyDelegate* proxy_delegate)
: http_server_properties_(http_server_properties),
transport_security_state_(transport_security_state),
ssl_config_service_(ssl_config_service),
resolver_(resolver),
enable_sending_initial_data_(true),
enable_ping_based_connection_checking_(
enable_ping_based_connection_checking),
session_max_recv_window_size_(session_max_recv_window_size),
stream_max_recv_window_size_(stream_max_recv_window_size),
time_func_(time_func),
proxy_delegate_(proxy_delegate) {
NetworkChangeNotifier::AddIPAddressObserver(this);
if (ssl_config_service_.get())
ssl_config_service_->AddObserver(this);
CertDatabase::GetInstance()->AddObserver(this);
}
SpdySessionPool::~SpdySessionPool() {
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_.get())
ssl_config_service_->RemoveObserver(this);
NetworkChangeNotifier::RemoveIPAddressObserver(this);
CertDatabase::GetInstance()->RemoveObserver(this);
}
base::WeakPtr<SpdySession> SpdySessionPool::CreateAvailableSessionFromSocket(
const SpdySessionKey& key,
std::unique_ptr<ClientSocketHandle> connection,
const NetLogWithSource& net_log,
bool is_secure) {
TRACE_EVENT0("net", "SpdySessionPool::CreateAvailableSessionFromSocket");
UMA_HISTOGRAM_ENUMERATION(
"Net.SpdySessionGet", IMPORTED_FROM_SOCKET, SPDY_SESSION_GET_MAX);
std::unique_ptr<SpdySession> new_session(new SpdySession(
key, http_server_properties_, transport_security_state_,
enable_sending_initial_data_, enable_ping_based_connection_checking_,
session_max_recv_window_size_, stream_max_recv_window_size_, time_func_,
proxy_delegate_, net_log.net_log()));
new_session->InitializeWithSocket(std::move(connection), this, is_secure);
base::WeakPtr<SpdySession> available_session = new_session->GetWeakPtr();
sessions_.insert(new_session.release());
MapKeyToAvailableSession(key, available_session);
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_[address] = key;
}
return available_session;
}
base::WeakPtr<SpdySession> SpdySessionPool::FindAvailableSession(
const SpdySessionKey& key,
const GURL& url,
const NetLogWithSource& net_log) {
UnclaimedPushedStreamMap::iterator url_it =
unclaimed_pushed_streams_.find(url);
if (!url.is_empty() && url_it != unclaimed_pushed_streams_.end()) {
DCHECK(url.SchemeIsCryptographic());
for (WeakSessionList::iterator it = url_it->second.begin();
it != url_it->second.end();) {
base::WeakPtr<SpdySession> spdy_session = *it;
// Lazy deletion of destroyed SpdySessions.
if (!spdy_session) {
it = url_it->second.erase(it);
continue;
}
++it;
const SpdySessionKey& spdy_session_key = spdy_session->spdy_session_key();
if (!(spdy_session_key.proxy_server() == key.proxy_server()) ||
!(spdy_session_key.privacy_mode() == key.privacy_mode())) {
continue;
}
if (!spdy_session->VerifyDomainAuthentication(
key.host_port_pair().host())) {
continue;
}
return spdy_session;
}
if (url_it->second.empty()) {
unclaimed_pushed_streams_.erase(url_it);
}
}
AvailableSessionMap::iterator it = LookupAvailableSessionByKey(key);
if (it != available_sessions_.end()) {
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;
}
// Look up the key's from the resolver's cache.
HostResolver::RequestInfo resolve_info(key.host_port_pair());
AddressList addresses;
int rv = resolver_->ResolveFromCache(resolve_info, &addresses, net_log);
DCHECK_NE(rv, ERR_IO_PENDING);
if (rv != OK)
return base::WeakPtr<SpdySession>();
// Check if we have a session through a domain alias.
for (AddressList::const_iterator address_it = addresses.begin();
address_it != addresses.end();
++address_it) {
AliasMap::const_iterator alias_it = aliases_.find(*address_it);
if (alias_it == aliases_.end())
continue;
// 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()))
continue;
AvailableSessionMap::iterator 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;
}
const base::WeakPtr<SpdySession>& available_session =
available_session_it->second;
DCHECK(base::ContainsKey(sessions_, available_session.get()));
// 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;
}
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());
// 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>();
}
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 (std::set<SpdySessionKey>::const_iterator 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,
unavailable_session->net_log().source().ToEventParametersCallback());
SessionSet::iterator 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() {
while (!available_sessions_.empty()) {
CloseCurrentSessionsHelper(ERR_ABORTED, "Closing all sessions.",
false /* idle_only */);
}
}
void SpdySessionPool::RegisterUnclaimedPushedStream(
GURL url,
base::WeakPtr<SpdySession> spdy_session) {
DCHECK(!url.is_empty());
// This SpdySessionPool must own |spdy_session|.
DCHECK(base::ContainsKey(sessions_, spdy_session.get()));
UnclaimedPushedStreamMap::iterator url_it =
unclaimed_pushed_streams_.lower_bound(url);
if (url_it == unclaimed_pushed_streams_.end() || url_it->first != url) {
WeakSessionList list;
list.push_back(std::move(spdy_session));
UnclaimedPushedStreamMap::value_type value(std::move(url), std::move(list));
unclaimed_pushed_streams_.insert(url_it, std::move(value));
return;
}
url_it->second.push_back(spdy_session);
}
void SpdySessionPool::UnregisterUnclaimedPushedStream(
const GURL& url,
SpdySession* spdy_session) {
DCHECK(!url.is_empty());
UnclaimedPushedStreamMap::iterator url_it =
unclaimed_pushed_streams_.find(url);
DCHECK(url_it != unclaimed_pushed_streams_.end());
size_t removed = 0;
for (WeakSessionList::iterator it = url_it->second.begin();
it != url_it->second.end();) {
// Lazy deletion of destroyed SpdySessions.
if (!*it) {
it = url_it->second.erase(it);
continue;
}
if (it->get() == spdy_session) {
it = url_it->second.erase(it);
++removed;
break;
}
++it;
}
if (url_it->second.empty()) {
unclaimed_pushed_streams_.erase(url_it);
}
DCHECK_EQ(1u, removed);
}
std::unique_ptr<base::Value> SpdySessionPool::SpdySessionPoolInfoToValue()
const {
std::unique_ptr<base::ListValue> list(new base::ListValue());
for (AvailableSessionMap::const_iterator 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.Equals(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(const X509Certificate* cert) {
CloseCurrentSessions(ERR_CERT_DATABASE_CHANGED);
}
bool SpdySessionPool::IsSessionAvailable(
const base::WeakPtr<SpdySession>& session) const {
for (AvailableSessionMap::const_iterator 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) {
AvailableSessionMap::iterator 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 (AliasMap::iterator it = aliases_.begin(); it != aliases_.end(); ) {
if (it->second.Equals(key)) {
AliasMap::iterator old_it = it;
++it;
aliases_.erase(old_it);
} else {
++it;
}
}
}
SpdySessionPool::WeakSessionList SpdySessionPool::GetCurrentSessions() const {
WeakSessionList current_sessions;
for (SessionSet::const_iterator 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 (WeakSessionList::const_iterator it = current_sessions.begin();
it != current_sessions.end(); ++it) {
if (!*it)
continue;
if (idle_only && (*it)->is_active())
continue;
(*it)->CloseSessionOnError(error, description);
DCHECK(!IsSessionAvailable(*it));
}
}
} // namespace net