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client_socket_pool_base.cc
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client_socket_pool_base.cc
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// 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/socket/client_socket_pool_base.h"
#include <algorithm>
#include <utility>
#include "base/compiler_specific.h"
#include "base/format_macros.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/metrics/histogram_macros.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/time/time.h"
#include "base/trace_event/memory_allocator_dump.h"
#include "base/trace_event/process_memory_dump.h"
#include "base/trace_event/trace_event.h"
#include "base/values.h"
#include "net/base/net_errors.h"
#include "net/base/trace_constants.h"
#include "net/log/net_log.h"
#include "net/log/net_log_event_type.h"
#include "net/log/net_log_source.h"
using base::TimeDelta;
namespace net {
namespace {
// Indicate whether or not we should establish a new transport layer connection
// after a certain timeout has passed without receiving an ACK.
bool g_connect_backup_jobs_enabled = true;
void SetSocketMotivation(StreamSocket* socket,
HttpRequestInfo::RequestMotivation motivation) {
if (motivation == HttpRequestInfo::PRECONNECT_MOTIVATED)
socket->SetSubresourceSpeculation();
else if (motivation == HttpRequestInfo::OMNIBOX_MOTIVATED)
socket->SetOmniboxSpeculation();
// TODO(mbelshe): Add other motivations (like EARLY_LOAD_MOTIVATED).
}
} // namespace
ConnectJob::ConnectJob(const std::string& group_name,
base::TimeDelta timeout_duration,
RequestPriority priority,
const SocketTag& socket_tag,
ClientSocketPool::RespectLimits respect_limits,
Delegate* delegate,
const NetLogWithSource& net_log)
: group_name_(group_name),
timeout_duration_(timeout_duration),
priority_(priority),
socket_tag_(socket_tag),
respect_limits_(respect_limits),
delegate_(delegate),
net_log_(net_log),
motivation_(HttpRequestInfo::NORMAL_MOTIVATION),
idle_(true) {
DCHECK(!group_name.empty());
DCHECK(delegate);
net_log.BeginEvent(NetLogEventType::SOCKET_POOL_CONNECT_JOB,
NetLog::StringCallback("group_name", &group_name_));
}
ConnectJob::~ConnectJob() {
net_log().EndEvent(NetLogEventType::SOCKET_POOL_CONNECT_JOB);
}
std::unique_ptr<StreamSocket> ConnectJob::PassSocket() {
return std::move(socket_);
}
int ConnectJob::Connect() {
if (!timeout_duration_.is_zero())
timer_.Start(FROM_HERE, timeout_duration_, this, &ConnectJob::OnTimeout);
idle_ = false;
LogConnectStart();
int rv = ConnectInternal();
if (rv != ERR_IO_PENDING) {
LogConnectCompletion(rv);
delegate_ = NULL;
}
return rv;
}
void ConnectJob::SetSocket(std::unique_ptr<StreamSocket> socket) {
if (socket) {
net_log().AddEvent(NetLogEventType::CONNECT_JOB_SET_SOCKET,
socket->NetLog().source().ToEventParametersCallback());
}
socket_ = std::move(socket);
}
void ConnectJob::NotifyDelegateOfCompletion(int rv) {
TRACE_EVENT0(kNetTracingCategory, "ConnectJob::NotifyDelegateOfCompletion");
// The delegate will own |this|.
Delegate* delegate = delegate_;
delegate_ = NULL;
if (socket_)
SetSocketMotivation(socket_.get(), motivation_);
LogConnectCompletion(rv);
delegate->OnConnectJobComplete(rv, this);
}
void ConnectJob::ResetTimer(base::TimeDelta remaining_time) {
timer_.Stop();
timer_.Start(FROM_HERE, remaining_time, this, &ConnectJob::OnTimeout);
}
void ConnectJob::LogConnectStart() {
connect_timing_.connect_start = base::TimeTicks::Now();
net_log().BeginEvent(NetLogEventType::SOCKET_POOL_CONNECT_JOB_CONNECT);
}
void ConnectJob::LogConnectCompletion(int net_error) {
connect_timing_.connect_end = base::TimeTicks::Now();
net_log().EndEventWithNetErrorCode(
NetLogEventType::SOCKET_POOL_CONNECT_JOB_CONNECT, net_error);
}
void ConnectJob::OnTimeout() {
// Make sure the socket is NULL before calling into |delegate|.
SetSocket(std::unique_ptr<StreamSocket>());
net_log_.AddEvent(NetLogEventType::SOCKET_POOL_CONNECT_JOB_TIMED_OUT);
NotifyDelegateOfCompletion(ERR_TIMED_OUT);
}
namespace internal {
ClientSocketPoolBaseHelper::Request::Request(
ClientSocketHandle* handle,
const CompletionCallback& callback,
RequestPriority priority,
const SocketTag& socket_tag,
ClientSocketPool::RespectLimits respect_limits,
Flags flags,
const NetLogWithSource& net_log)
: handle_(handle),
callback_(callback),
priority_(priority),
respect_limits_(respect_limits),
flags_(flags),
net_log_(net_log),
socket_tag_(socket_tag) {
if (respect_limits_ == ClientSocketPool::RespectLimits::DISABLED)
DCHECK_EQ(priority_, MAXIMUM_PRIORITY);
}
ClientSocketPoolBaseHelper::Request::~Request() {
liveness_ = DEAD;
}
void ClientSocketPoolBaseHelper::Request::CrashIfInvalid() const {
CHECK_EQ(liveness_, ALIVE);
}
ClientSocketPoolBaseHelper::ClientSocketPoolBaseHelper(
HigherLayeredPool* pool,
int max_sockets,
int max_sockets_per_group,
base::TimeDelta unused_idle_socket_timeout,
base::TimeDelta used_idle_socket_timeout,
ConnectJobFactory* connect_job_factory)
: idle_socket_count_(0),
connecting_socket_count_(0),
handed_out_socket_count_(0),
max_sockets_(max_sockets),
max_sockets_per_group_(max_sockets_per_group),
unused_idle_socket_timeout_(unused_idle_socket_timeout),
used_idle_socket_timeout_(used_idle_socket_timeout),
connect_job_factory_(connect_job_factory),
connect_backup_jobs_enabled_(false),
pool_generation_number_(0),
pool_(pool),
weak_factory_(this) {
DCHECK_LE(0, max_sockets_per_group);
DCHECK_LE(max_sockets_per_group, max_sockets);
NetworkChangeNotifier::AddIPAddressObserver(this);
}
ClientSocketPoolBaseHelper::~ClientSocketPoolBaseHelper() {
// Clean up any idle sockets and pending connect jobs. Assert that we have no
// remaining active sockets or pending requests. They should have all been
// cleaned up prior to |this| being destroyed.
FlushWithError(ERR_ABORTED);
DCHECK(group_map_.empty());
DCHECK(pending_callback_map_.empty());
DCHECK_EQ(0, connecting_socket_count_);
CHECK(higher_pools_.empty());
NetworkChangeNotifier::RemoveIPAddressObserver(this);
// Remove from lower layer pools.
for (std::set<LowerLayeredPool*>::iterator it = lower_pools_.begin();
it != lower_pools_.end();
++it) {
(*it)->RemoveHigherLayeredPool(pool_);
}
}
ClientSocketPoolBaseHelper::CallbackResultPair::CallbackResultPair()
: result(OK) {
}
ClientSocketPoolBaseHelper::CallbackResultPair::CallbackResultPair(
const CompletionCallback& callback_in, int result_in)
: callback(callback_in),
result(result_in) {
}
ClientSocketPoolBaseHelper::CallbackResultPair::CallbackResultPair(
const CallbackResultPair& other) = default;
ClientSocketPoolBaseHelper::CallbackResultPair::~CallbackResultPair() = default;
bool ClientSocketPoolBaseHelper::IsStalled() const {
// If a lower layer pool is stalled, consider |this| stalled as well.
for (std::set<LowerLayeredPool*>::const_iterator it = lower_pools_.begin();
it != lower_pools_.end();
++it) {
if ((*it)->IsStalled())
return true;
}
// If fewer than |max_sockets_| are in use, then clearly |this| is not
// stalled.
if ((handed_out_socket_count_ + connecting_socket_count_) < max_sockets_)
return false;
// So in order to be stalled, |this| must be using at least |max_sockets_| AND
// |this| must have a request that is actually stalled on the global socket
// limit. To find such a request, look for a group that has more requests
// than jobs AND where the number of sockets is less than
// |max_sockets_per_group_|. (If the number of sockets is equal to
// |max_sockets_per_group_|, then the request is stalled on the group limit,
// which does not count.)
for (GroupMap::const_iterator it = group_map_.begin();
it != group_map_.end(); ++it) {
if (it->second->CanUseAdditionalSocketSlot(max_sockets_per_group_))
return true;
}
return false;
}
void ClientSocketPoolBaseHelper::AddLowerLayeredPool(
LowerLayeredPool* lower_pool) {
DCHECK(pool_);
CHECK(!base::ContainsKey(lower_pools_, lower_pool));
lower_pools_.insert(lower_pool);
lower_pool->AddHigherLayeredPool(pool_);
}
void ClientSocketPoolBaseHelper::AddHigherLayeredPool(
HigherLayeredPool* higher_pool) {
CHECK(higher_pool);
CHECK(!base::ContainsKey(higher_pools_, higher_pool));
higher_pools_.insert(higher_pool);
}
void ClientSocketPoolBaseHelper::RemoveHigherLayeredPool(
HigherLayeredPool* higher_pool) {
CHECK(higher_pool);
CHECK(base::ContainsKey(higher_pools_, higher_pool));
higher_pools_.erase(higher_pool);
}
int ClientSocketPoolBaseHelper::RequestSocket(
const std::string& group_name,
std::unique_ptr<Request> request) {
CHECK(!request->callback().is_null());
CHECK(request->handle());
// Cleanup any timed-out idle sockets.
CleanupIdleSockets(false);
request->net_log().BeginEvent(NetLogEventType::SOCKET_POOL);
Group* group = GetOrCreateGroup(group_name);
int rv = RequestSocketInternal(group_name, *request,
HttpRequestInfo::NORMAL_MOTIVATION);
if (rv != ERR_IO_PENDING) {
if (rv == OK) {
request->handle()->socket()->ApplySocketTag(request->socket_tag());
}
request->net_log().EndEventWithNetErrorCode(NetLogEventType::SOCKET_POOL,
rv);
CHECK(!request->handle()->is_initialized());
request.reset();
} else {
group->InsertPendingRequest(std::move(request));
// Have to do this asynchronously, as closing sockets in higher level pools
// call back in to |this|, which will cause all sorts of fun and exciting
// re-entrancy issues if the socket pool is doing something else at the
// time.
if (group->CanUseAdditionalSocketSlot(max_sockets_per_group_)) {
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE,
base::Bind(
&ClientSocketPoolBaseHelper::TryToCloseSocketsInLayeredPools,
weak_factory_.GetWeakPtr()));
}
}
return rv;
}
void ClientSocketPoolBaseHelper::RequestSockets(
const std::string& group_name,
const Request& request,
int num_sockets,
HttpRequestInfo::RequestMotivation motivation) {
DCHECK(request.callback().is_null());
DCHECK(!request.handle());
// Cleanup any timed-out idle sockets.
CleanupIdleSockets(false);
if (num_sockets > max_sockets_per_group_) {
num_sockets = max_sockets_per_group_;
}
request.net_log().BeginEvent(
NetLogEventType::SOCKET_POOL_CONNECTING_N_SOCKETS,
NetLog::IntCallback("num_sockets", num_sockets));
Group* group = GetOrCreateGroup(group_name);
// RequestSocketsInternal() may delete the group.
bool deleted_group = false;
int rv = OK;
for (int num_iterations_left = num_sockets;
group->NumActiveSocketSlots() < num_sockets &&
num_iterations_left > 0 ; num_iterations_left--) {
rv = RequestSocketInternal(group_name, request, motivation);
if (rv < 0 && rv != ERR_IO_PENDING) {
// We're encountering a synchronous error. Give up.
if (!base::ContainsKey(group_map_, group_name))
deleted_group = true;
break;
}
if (!base::ContainsKey(group_map_, group_name)) {
// Unexpected. The group should only be getting deleted on synchronous
// error.
NOTREACHED();
deleted_group = true;
break;
}
}
if (!deleted_group && group->IsEmpty())
RemoveGroup(group_name);
if (rv == ERR_IO_PENDING)
rv = OK;
request.net_log().EndEventWithNetErrorCode(
NetLogEventType::SOCKET_POOL_CONNECTING_N_SOCKETS, rv);
}
int ClientSocketPoolBaseHelper::RequestSocketInternal(
const std::string& group_name,
const Request& request,
HttpRequestInfo::RequestMotivation motivation) {
ClientSocketHandle* const handle = request.handle();
const bool preconnecting = !handle;
Group* group = GetOrCreateGroup(group_name);
if (!(request.flags() & NO_IDLE_SOCKETS)) {
// Try to reuse a socket.
if (AssignIdleSocketToRequest(request, group))
return OK;
}
// If there are more ConnectJobs than pending requests, don't need to do
// anything. Can just wait for the extra job to connect, and then assign it
// to the request.
if (!preconnecting && group->TryToUseUnassignedConnectJob())
return ERR_IO_PENDING;
// Can we make another active socket now?
if (!group->HasAvailableSocketSlot(max_sockets_per_group_) &&
request.respect_limits() == ClientSocketPool::RespectLimits::ENABLED) {
// TODO(willchan): Consider whether or not we need to close a socket in a
// higher layered group. I don't think this makes sense since we would just
// reuse that socket then if we needed one and wouldn't make it down to this
// layer.
request.net_log().AddEvent(
NetLogEventType::SOCKET_POOL_STALLED_MAX_SOCKETS_PER_GROUP);
return ERR_IO_PENDING;
}
if (ReachedMaxSocketsLimit() &&
request.respect_limits() == ClientSocketPool::RespectLimits::ENABLED) {
// NOTE(mmenke): Wonder if we really need different code for each case
// here. Only reason for them now seems to be preconnects.
if (idle_socket_count() > 0) {
// There's an idle socket in this pool. Either that's because there's
// still one in this group, but we got here due to preconnecting bypassing
// idle sockets, or because there's an idle socket in another group.
bool closed = CloseOneIdleSocketExceptInGroup(group);
if (preconnecting && !closed)
return ERR_PRECONNECT_MAX_SOCKET_LIMIT;
} else {
// We could check if we really have a stalled group here, but it requires
// a scan of all groups, so just flip a flag here, and do the check later.
request.net_log().AddEvent(
NetLogEventType::SOCKET_POOL_STALLED_MAX_SOCKETS);
return ERR_IO_PENDING;
}
}
// We couldn't find a socket to reuse, and there's space to allocate one,
// so allocate and connect a new one.
std::unique_ptr<ConnectJob> connect_job(
connect_job_factory_->NewConnectJob(group_name, request, this));
connect_job->set_motivation(motivation);
int rv = connect_job->Connect();
if (rv == OK) {
LogBoundConnectJobToRequest(connect_job->net_log().source(), request);
if (!preconnecting) {
HandOutSocket(connect_job->PassSocket(), ClientSocketHandle::UNUSED,
connect_job->connect_timing(), handle, base::TimeDelta(),
group, request.net_log());
} else {
AddIdleSocket(connect_job->PassSocket(), group);
}
} else if (rv == ERR_IO_PENDING) {
// If we don't have any sockets in this group, set a timer for potentially
// creating a new one. If the SYN is lost, this backup socket may complete
// before the slow socket, improving end user latency.
if (connect_backup_jobs_enabled_ && group->IsEmpty()) {
group->StartBackupJobTimer(group_name, this);
}
connecting_socket_count_++;
group->AddJob(std::move(connect_job), preconnecting);
} else {
LogBoundConnectJobToRequest(connect_job->net_log().source(), request);
std::unique_ptr<StreamSocket> error_socket;
if (!preconnecting) {
DCHECK(handle);
connect_job->GetAdditionalErrorState(handle);
error_socket = connect_job->PassSocket();
}
if (error_socket) {
HandOutSocket(std::move(error_socket), ClientSocketHandle::UNUSED,
connect_job->connect_timing(), handle, base::TimeDelta(),
group, request.net_log());
} else if (group->IsEmpty()) {
RemoveGroup(group_name);
}
}
return rv;
}
bool ClientSocketPoolBaseHelper::AssignIdleSocketToRequest(
const Request& request, Group* group) {
std::list<IdleSocket>* idle_sockets = group->mutable_idle_sockets();
std::list<IdleSocket>::iterator idle_socket_it = idle_sockets->end();
// Iterate through the idle sockets forwards (oldest to newest)
// * Delete any disconnected ones.
// * If we find a used idle socket, assign to |idle_socket|. At the end,
// the |idle_socket_it| will be set to the newest used idle socket.
for (std::list<IdleSocket>::iterator it = idle_sockets->begin();
it != idle_sockets->end();) {
// Check whether socket is usable. Note that it's unlikely that the socket
// is not usuable because this function is always invoked after a
// reusability check, but in theory socket can be closed asynchronously.
if (!it->IsUsable()) {
DecrementIdleCount();
delete it->socket;
it = idle_sockets->erase(it);
continue;
}
if (it->socket->WasEverUsed()) {
// We found one we can reuse!
idle_socket_it = it;
}
++it;
}
// If we haven't found an idle socket, that means there are no used idle
// sockets. Pick the oldest (first) idle socket (FIFO).
if (idle_socket_it == idle_sockets->end() && !idle_sockets->empty())
idle_socket_it = idle_sockets->begin();
if (idle_socket_it != idle_sockets->end()) {
DecrementIdleCount();
base::TimeDelta idle_time =
base::TimeTicks::Now() - idle_socket_it->start_time;
IdleSocket idle_socket = *idle_socket_it;
idle_sockets->erase(idle_socket_it);
// TODO(davidben): If |idle_time| is under some low watermark, consider
// treating as UNUSED rather than UNUSED_IDLE. This will avoid
// HttpNetworkTransaction retrying on some errors.
ClientSocketHandle::SocketReuseType reuse_type =
idle_socket.socket->WasEverUsed() ?
ClientSocketHandle::REUSED_IDLE :
ClientSocketHandle::UNUSED_IDLE;
// If this socket took multiple attempts to obtain, don't report those
// every time it's reused, just to the first user.
if (idle_socket.socket->WasEverUsed())
idle_socket.socket->ClearConnectionAttempts();
HandOutSocket(std::unique_ptr<StreamSocket>(idle_socket.socket), reuse_type,
LoadTimingInfo::ConnectTiming(), request.handle(), idle_time,
group, request.net_log());
return true;
}
return false;
}
// static
void ClientSocketPoolBaseHelper::LogBoundConnectJobToRequest(
const NetLogSource& connect_job_source,
const Request& request) {
request.net_log().AddEvent(NetLogEventType::SOCKET_POOL_BOUND_TO_CONNECT_JOB,
connect_job_source.ToEventParametersCallback());
}
void ClientSocketPoolBaseHelper::SetPriority(const std::string& group_name,
ClientSocketHandle* handle,
RequestPriority priority) {
GroupMap::iterator group_it = group_map_.find(group_name);
if (group_it == group_map_.end()) {
DCHECK(base::ContainsKey(pending_callback_map_, handle));
// The Request has already completed and been destroyed; nothing to
// reprioritize.
return;
}
group_it->second->SetPriority(handle, priority);
}
void ClientSocketPoolBaseHelper::CancelRequest(
const std::string& group_name, ClientSocketHandle* handle) {
PendingCallbackMap::iterator callback_it = pending_callback_map_.find(handle);
if (callback_it != pending_callback_map_.end()) {
int result = callback_it->second.result;
pending_callback_map_.erase(callback_it);
std::unique_ptr<StreamSocket> socket = handle->PassSocket();
if (socket) {
if (result != OK)
socket->Disconnect();
ReleaseSocket(handle->group_name(), std::move(socket), handle->id());
}
return;
}
CHECK(base::ContainsKey(group_map_, group_name));
Group* group = GetOrCreateGroup(group_name);
// Search pending_requests for matching handle.
std::unique_ptr<Request> request = group->FindAndRemovePendingRequest(handle);
if (request) {
request->net_log().AddEvent(NetLogEventType::CANCELLED);
request->net_log().EndEvent(NetLogEventType::SOCKET_POOL);
// We let the job run, unless we're at the socket limit and there is
// not another request waiting on the job.
if (group->jobs().size() > group->pending_request_count() &&
ReachedMaxSocketsLimit()) {
RemoveConnectJob(group->jobs().begin()->get(), group);
CheckForStalledSocketGroups();
}
}
}
bool ClientSocketPoolBaseHelper::HasGroup(const std::string& group_name) const {
return base::ContainsKey(group_map_, group_name);
}
void ClientSocketPoolBaseHelper::CloseIdleSockets() {
CleanupIdleSockets(true);
DCHECK_EQ(0, idle_socket_count_);
}
void ClientSocketPoolBaseHelper::CloseIdleSocketsInGroup(
const std::string& group_name) {
if (idle_socket_count_ == 0)
return;
GroupMap::iterator it = group_map_.find(group_name);
if (it == group_map_.end())
return;
CleanupIdleSocketsInGroup(true, it->second, base::TimeTicks::Now());
if (it->second->IsEmpty())
RemoveGroup(it);
}
int ClientSocketPoolBaseHelper::IdleSocketCountInGroup(
const std::string& group_name) const {
GroupMap::const_iterator i = group_map_.find(group_name);
CHECK(i != group_map_.end());
return i->second->idle_sockets().size();
}
LoadState ClientSocketPoolBaseHelper::GetLoadState(
const std::string& group_name,
const ClientSocketHandle* handle) const {
if (base::ContainsKey(pending_callback_map_, handle))
return LOAD_STATE_CONNECTING;
GroupMap::const_iterator group_it = group_map_.find(group_name);
if (group_it == group_map_.end()) {
// TODO(mmenke): This is actually reached in the wild, for unknown reasons.
// Would be great to understand why, and if it's a bug, fix it. If not,
// should have a test for that case.
NOTREACHED();
return LOAD_STATE_IDLE;
}
const Group& group = *group_it->second;
if (group.HasConnectJobForHandle(handle)) {
// Just return the state of the oldest ConnectJob.
return (*group.jobs().begin())->GetLoadState();
}
if (group.CanUseAdditionalSocketSlot(max_sockets_per_group_))
return LOAD_STATE_WAITING_FOR_STALLED_SOCKET_POOL;
return LOAD_STATE_WAITING_FOR_AVAILABLE_SOCKET;
}
std::unique_ptr<base::DictionaryValue>
ClientSocketPoolBaseHelper::GetInfoAsValue(const std::string& name,
const std::string& type) const {
auto dict = std::make_unique<base::DictionaryValue>();
dict->SetString("name", name);
dict->SetString("type", type);
dict->SetInteger("handed_out_socket_count", handed_out_socket_count_);
dict->SetInteger("connecting_socket_count", connecting_socket_count_);
dict->SetInteger("idle_socket_count", idle_socket_count_);
dict->SetInteger("max_socket_count", max_sockets_);
dict->SetInteger("max_sockets_per_group", max_sockets_per_group_);
dict->SetInteger("pool_generation_number", pool_generation_number_);
if (group_map_.empty())
return dict;
auto all_groups_dict = std::make_unique<base::DictionaryValue>();
for (GroupMap::const_iterator it = group_map_.begin();
it != group_map_.end(); it++) {
const Group* group = it->second;
auto group_dict = std::make_unique<base::DictionaryValue>();
group_dict->SetInteger("pending_request_count",
group->pending_request_count());
if (group->has_pending_requests()) {
group_dict->SetString(
"top_pending_priority",
RequestPriorityToString(group->TopPendingPriority()));
}
group_dict->SetInteger("active_socket_count", group->active_socket_count());
auto idle_socket_list = std::make_unique<base::ListValue>();
std::list<IdleSocket>::const_iterator idle_socket;
for (idle_socket = group->idle_sockets().begin();
idle_socket != group->idle_sockets().end();
idle_socket++) {
int source_id = idle_socket->socket->NetLog().source().id;
idle_socket_list->AppendInteger(source_id);
}
group_dict->Set("idle_sockets", std::move(idle_socket_list));
auto connect_jobs_list = std::make_unique<base::ListValue>();
for (auto job = group->jobs().begin(); job != group->jobs().end(); job++) {
int source_id = (*job)->net_log().source().id;
connect_jobs_list->AppendInteger(source_id);
}
group_dict->Set("connect_jobs", std::move(connect_jobs_list));
group_dict->SetBoolean("is_stalled", group->CanUseAdditionalSocketSlot(
max_sockets_per_group_));
group_dict->SetBoolean("backup_job_timer_is_running",
group->BackupJobTimerIsRunning());
all_groups_dict->SetWithoutPathExpansion(it->first, std::move(group_dict));
}
dict->Set("groups", std::move(all_groups_dict));
return dict;
}
void ClientSocketPoolBaseHelper::DumpMemoryStats(
base::trace_event::ProcessMemoryDump* pmd,
const std::string& parent_dump_absolute_name) const {
size_t socket_count = 0;
size_t total_size = 0;
size_t buffer_size = 0;
size_t cert_count = 0;
size_t cert_size = 0;
for (const auto& kv : group_map_) {
for (const auto& socket : kv.second->idle_sockets()) {
StreamSocket::SocketMemoryStats stats;
socket.socket->DumpMemoryStats(&stats);
total_size += stats.total_size;
buffer_size += stats.buffer_size;
cert_count += stats.cert_count;
cert_size += stats.cert_size;
++socket_count;
}
}
// Only create a MemoryAllocatorDump if there is at least one idle socket
if (socket_count > 0) {
base::trace_event::MemoryAllocatorDump* socket_pool_dump =
pmd->CreateAllocatorDump(base::StringPrintf(
"%s/socket_pool", parent_dump_absolute_name.c_str()));
socket_pool_dump->AddScalar(
base::trace_event::MemoryAllocatorDump::kNameSize,
base::trace_event::MemoryAllocatorDump::kUnitsBytes, total_size);
socket_pool_dump->AddScalar(
base::trace_event::MemoryAllocatorDump::kNameObjectCount,
base::trace_event::MemoryAllocatorDump::kUnitsObjects, socket_count);
socket_pool_dump->AddScalar(
"buffer_size", base::trace_event::MemoryAllocatorDump::kUnitsBytes,
buffer_size);
socket_pool_dump->AddScalar(
"cert_count", base::trace_event::MemoryAllocatorDump::kUnitsObjects,
cert_count);
socket_pool_dump->AddScalar(
"cert_size", base::trace_event::MemoryAllocatorDump::kUnitsBytes,
cert_size);
}
}
bool ClientSocketPoolBaseHelper::IdleSocket::IsUsable() const {
if (socket->WasEverUsed())
return socket->IsConnectedAndIdle();
return socket->IsConnected();
}
void ClientSocketPoolBaseHelper::CleanupIdleSockets(bool force) {
if (idle_socket_count_ == 0)
return;
// Current time value. Retrieving it once at the function start rather than
// inside the inner loop, since it shouldn't change by any meaningful amount.
base::TimeTicks now = base::TimeTicks::Now();
for (GroupMap::iterator i = group_map_.begin(); i != group_map_.end();) {
Group* group = i->second;
CleanupIdleSocketsInGroup(force, group, now);
// Delete group if no longer needed.
if (group->IsEmpty()) {
GroupMap::iterator old = i++;
RemoveGroup(old);
} else {
++i;
}
}
}
void ClientSocketPoolBaseHelper::CleanupIdleSocketsInGroup(
bool force,
Group* group,
const base::TimeTicks& now) {
auto idle_socket_it = group->mutable_idle_sockets()->begin();
while (idle_socket_it != group->idle_sockets().end()) {
base::TimeDelta timeout = idle_socket_it->socket->WasEverUsed()
? used_idle_socket_timeout_
: unused_idle_socket_timeout_;
bool timed_out = (now - idle_socket_it->start_time) >= timeout;
bool should_clean_up = force || timed_out || !idle_socket_it->IsUsable();
if (should_clean_up) {
delete idle_socket_it->socket;
idle_socket_it = group->mutable_idle_sockets()->erase(idle_socket_it);
DecrementIdleCount();
} else {
++idle_socket_it;
}
}
}
ClientSocketPoolBaseHelper::Group* ClientSocketPoolBaseHelper::GetOrCreateGroup(
const std::string& group_name) {
GroupMap::iterator it = group_map_.find(group_name);
if (it != group_map_.end())
return it->second;
Group* group = new Group;
group_map_[group_name] = group;
return group;
}
void ClientSocketPoolBaseHelper::RemoveGroup(const std::string& group_name) {
GroupMap::iterator it = group_map_.find(group_name);
CHECK(it != group_map_.end());
RemoveGroup(it);
}
void ClientSocketPoolBaseHelper::RemoveGroup(GroupMap::iterator it) {
delete it->second;
group_map_.erase(it);
}
// static
bool ClientSocketPoolBaseHelper::connect_backup_jobs_enabled() {
return g_connect_backup_jobs_enabled;
}
// static
bool ClientSocketPoolBaseHelper::set_connect_backup_jobs_enabled(bool enabled) {
bool old_value = g_connect_backup_jobs_enabled;
g_connect_backup_jobs_enabled = enabled;
return old_value;
}
void ClientSocketPoolBaseHelper::EnableConnectBackupJobs() {
connect_backup_jobs_enabled_ = g_connect_backup_jobs_enabled;
}
void ClientSocketPoolBaseHelper::IncrementIdleCount() {
++idle_socket_count_;
}
void ClientSocketPoolBaseHelper::DecrementIdleCount() {
--idle_socket_count_;
}
void ClientSocketPoolBaseHelper::ReleaseSocket(
const std::string& group_name,
std::unique_ptr<StreamSocket> socket,
int id) {
GroupMap::iterator i = group_map_.find(group_name);
CHECK(i != group_map_.end());
Group* group = i->second;
CHECK_GT(handed_out_socket_count_, 0);
handed_out_socket_count_--;
CHECK_GT(group->active_socket_count(), 0);
group->DecrementActiveSocketCount();
const bool can_reuse = socket->IsConnectedAndIdle() &&
id == pool_generation_number_;
if (can_reuse) {
// Add it to the idle list.
AddIdleSocket(std::move(socket), group);
OnAvailableSocketSlot(group_name, group);
} else {
socket.reset();
}
CheckForStalledSocketGroups();
}
void ClientSocketPoolBaseHelper::CheckForStalledSocketGroups() {
// Loop until there's nothing more to do.
while (true) {
// If we have idle sockets, see if we can give one to the top-stalled group.
std::string top_group_name;
Group* top_group = NULL;
if (!FindTopStalledGroup(&top_group, &top_group_name)) {
// There may still be a stalled group in a lower level pool.
for (std::set<LowerLayeredPool*>::iterator it = lower_pools_.begin();
it != lower_pools_.end(); ++it) {
if ((*it)->IsStalled()) {
CloseOneIdleSocket();
break;
}
}
return;
}
if (ReachedMaxSocketsLimit()) {
if (idle_socket_count() > 0) {
CloseOneIdleSocket();
} else {
// We can't activate more sockets since we're already at our global
// limit.
return;
}
}
// Note that this may delete top_group.
OnAvailableSocketSlot(top_group_name, top_group);
}
}
// Search for the highest priority pending request, amongst the groups that
// are not at the |max_sockets_per_group_| limit. Note: for requests with
// the same priority, the winner is based on group hash ordering (and not
// insertion order).
bool ClientSocketPoolBaseHelper::FindTopStalledGroup(
Group** group,
std::string* group_name) const {
CHECK((group && group_name) || (!group && !group_name));
Group* top_group = NULL;
const std::string* top_group_name = NULL;
bool has_stalled_group = false;
for (GroupMap::const_iterator i = group_map_.begin();
i != group_map_.end(); ++i) {
Group* curr_group = i->second;
if (!curr_group->has_pending_requests())
continue;
if (curr_group->CanUseAdditionalSocketSlot(max_sockets_per_group_)) {
if (!group)
return true;
has_stalled_group = true;
bool has_higher_priority = !top_group ||
curr_group->TopPendingPriority() > top_group->TopPendingPriority();
if (has_higher_priority) {
top_group = curr_group;
top_group_name = &i->first;
}
}
}
if (top_group) {
CHECK(group);
*group = top_group;
*group_name = *top_group_name;
} else {
CHECK(!has_stalled_group);
}
return has_stalled_group;
}
void ClientSocketPoolBaseHelper::OnConnectJobComplete(
int result, ConnectJob* job) {
DCHECK_NE(ERR_IO_PENDING, result);
const std::string group_name = job->group_name();
GroupMap::iterator group_it = group_map_.find(group_name);
CHECK(group_it != group_map_.end());
Group* group = group_it->second;
std::unique_ptr<StreamSocket> socket = job->PassSocket();
// Copies of these are needed because |job| may be deleted before they are
// accessed.
NetLogWithSource job_log = job->net_log();
LoadTimingInfo::ConnectTiming connect_timing = job->connect_timing();
// RemoveConnectJob(job, _) must be called by all branches below;
// otherwise, |job| will be leaked.
if (result == OK) {
DCHECK(socket.get());
RemoveConnectJob(job, group);
std::unique_ptr<Request> request = group->PopNextPendingRequest();
if (request) {
LogBoundConnectJobToRequest(job_log.source(), *request);
HandOutSocket(std::move(socket), ClientSocketHandle::UNUSED,
connect_timing, request->handle(), base::TimeDelta(), group,
request->net_log());
request->net_log().EndEvent(NetLogEventType::SOCKET_POOL);
InvokeUserCallbackLater(request->handle(), request->callback(), result,
request->socket_tag());
} else {
AddIdleSocket(std::move(socket), group);
OnAvailableSocketSlot(group_name, group);
CheckForStalledSocketGroups();
}
} else {
// If we got a socket, it must contain error information so pass that
// up so that the caller can retrieve it.
bool handed_out_socket = false;
std::unique_ptr<Request> request = group->PopNextPendingRequest();
if (request) {
LogBoundConnectJobToRequest(job_log.source(), *request);
job->GetAdditionalErrorState(request->handle());
RemoveConnectJob(job, group);
if (socket.get()) {
handed_out_socket = true;
HandOutSocket(std::move(socket), ClientSocketHandle::UNUSED,
connect_timing, request->handle(), base::TimeDelta(),
group, request->net_log());
}
request->net_log().EndEventWithNetErrorCode(NetLogEventType::SOCKET_POOL,
result);
InvokeUserCallbackLater(request->handle(), request->callback(), result,
request->socket_tag());