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Merge pull request #7088 from Icinga/feature/asio-event-queue 

Implement new event queue for ASIO consumers
This commit is contained in:
Michael Friedrich 2019-04-25 16:54:43 +02:00 committed by GitHub
parent a630d0185f a7873da89d
commit 37de1a919b
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 401 additions and 94 deletions
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60
lib/icinga/apievents.cpp
View File

@ -35,8 +35,9 @@ void ApiEvents::StaticInitialize()
void ApiEvents::CheckResultHandler(const Checkable::Ptr& checkable, const CheckResult::Ptr& cr, const MessageOrigin::Ptr& origin)
{
std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("CheckResult");
auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::CheckResult));
if (queues.empty())
if (queues.empty() && !inboxes)
return;
Log(LogDebug, "ApiEvents", "Processing event type 'CheckResult'.");
@ -58,13 +59,16 @@ void ApiEvents::CheckResultHandler(const Checkable::Ptr& checkable, const CheckR
for (const EventQueue::Ptr& queue : queues) {
queue->ProcessEvent(result);
}
inboxes.Push(std::move(result));
}
void ApiEvents::StateChangeHandler(const Checkable::Ptr& checkable, const CheckResult::Ptr& cr, StateType type, const MessageOrigin::Ptr& origin)
{
std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("StateChange");
auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::StateChange));
if (queues.empty())
if (queues.empty() && !inboxes)
return;
Log(LogDebug, "ApiEvents", "Processing event type 'StateChange'.");
@ -88,6 +92,8 @@ void ApiEvents::StateChangeHandler(const Checkable::Ptr& checkable, const CheckR
for (const EventQueue::Ptr& queue : queues) {
queue->ProcessEvent(result);
}
inboxes.Push(std::move(result));
}
void ApiEvents::NotificationSentToAllUsersHandler(const Notification::Ptr& notification,
@ -95,8 +101,9 @@ void ApiEvents::NotificationSentToAllUsersHandler(const Notification::Ptr& notif
const CheckResult::Ptr& cr, const String& author, const String& text, const MessageOrigin::Ptr& origin)
{
std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("Notification");
auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::Notification));
if (queues.empty())
if (queues.empty() && !inboxes)
return;
Log(LogDebug, "ApiEvents", "Processing event type 'Notification'.");
@ -133,13 +140,16 @@ void ApiEvents::NotificationSentToAllUsersHandler(const Notification::Ptr& notif
for (const EventQueue::Ptr& queue : queues) {
queue->ProcessEvent(result);
}
inboxes.Push(std::move(result));
}
void ApiEvents::FlappingChangedHandler(const Checkable::Ptr& checkable, const MessageOrigin::Ptr& origin)
{
std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("Flapping");
auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::Flapping));
if (queues.empty())
if (queues.empty() && !inboxes)
return;
Log(LogDebug, "ApiEvents", "Processing event type 'Flapping'.");
@ -166,6 +176,8 @@ void ApiEvents::FlappingChangedHandler(const Checkable::Ptr& checkable, const Me
for (const EventQueue::Ptr& queue : queues) {
queue->ProcessEvent(result);
}
inboxes.Push(std::move(result));
}
void ApiEvents::AcknowledgementSetHandler(const Checkable::Ptr& checkable,
@ -173,8 +185,9 @@ void ApiEvents::AcknowledgementSetHandler(const Checkable::Ptr& checkable,
bool notify, bool persistent, double expiry, const MessageOrigin::Ptr& origin)
{
std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("AcknowledgementSet");
auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::AcknowledgementSet));
if (queues.empty())
if (queues.empty() && !inboxes)
return;
Log(LogDebug, "ApiEvents", "Processing event type 'AcknowledgementSet'.");
@ -204,13 +217,16 @@ void ApiEvents::AcknowledgementSetHandler(const Checkable::Ptr& checkable,
for (const EventQueue::Ptr& queue : queues) {
queue->ProcessEvent(result);
}
inboxes.Push(std::move(result));
}
void ApiEvents::AcknowledgementClearedHandler(const Checkable::Ptr& checkable, const MessageOrigin::Ptr& origin)
{
std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("AcknowledgementCleared");
auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::AcknowledgementCleared));
if (queues.empty())
if (queues.empty() && !inboxes)
return;
Log(LogDebug, "ApiEvents", "Processing event type 'AcknowledgementCleared'.");
@ -235,13 +251,16 @@ void ApiEvents::AcknowledgementClearedHandler(const Checkable::Ptr& checkable, c
}
result->Set("acknowledgement_type", AcknowledgementNone);
inboxes.Push(std::move(result));
}
void ApiEvents::CommentAddedHandler(const Comment::Ptr& comment)
{
std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("CommentAdded");
auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::CommentAdded));
if (queues.empty())
if (queues.empty() && !inboxes)
return;
Log(LogDebug, "ApiEvents", "Processing event type 'CommentAdded'.");
@ -255,13 +274,16 @@ void ApiEvents::CommentAddedHandler(const Comment::Ptr& comment)
for (const EventQueue::Ptr& queue : queues) {
queue->ProcessEvent(result);
}
inboxes.Push(std::move(result));
}
void ApiEvents::CommentRemovedHandler(const Comment::Ptr& comment)
{
std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("CommentRemoved");
auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::CommentRemoved));
if (queues.empty())
if (queues.empty() && !inboxes)
return;
Log(LogDebug, "ApiEvents", "Processing event type 'CommentRemoved'.");
@ -275,13 +297,16 @@ void ApiEvents::CommentRemovedHandler(const Comment::Ptr& comment)
for (const EventQueue::Ptr& queue : queues) {
queue->ProcessEvent(result);
}
inboxes.Push(std::move(result));
}
void ApiEvents::DowntimeAddedHandler(const Downtime::Ptr& downtime)
{
std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("DowntimeAdded");
auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::DowntimeAdded));
if (queues.empty())
if (queues.empty() && !inboxes)
return;
Log(LogDebug, "ApiEvents", "Processing event type 'DowntimeAdded'.");
@ -295,13 +320,16 @@ void ApiEvents::DowntimeAddedHandler(const Downtime::Ptr& downtime)
for (const EventQueue::Ptr& queue : queues) {
queue->ProcessEvent(result);
}
inboxes.Push(std::move(result));
}
void ApiEvents::DowntimeRemovedHandler(const Downtime::Ptr& downtime)
{
std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("DowntimeRemoved");
auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::DowntimeRemoved));
if (queues.empty())
if (queues.empty() && !inboxes)
return;
Log(LogDebug, "ApiEvents", "Processing event type 'DowntimeRemoved'.");
@ -315,13 +343,16 @@ void ApiEvents::DowntimeRemovedHandler(const Downtime::Ptr& downtime)
for (const EventQueue::Ptr& queue : queues) {
queue->ProcessEvent(result);
}
inboxes.Push(std::move(result));
}
void ApiEvents::DowntimeStartedHandler(const Downtime::Ptr& downtime)
{
std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("DowntimeStarted");
auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::DowntimeStarted));
if (queues.empty())
if (queues.empty() && !inboxes)
return;
Log(LogDebug, "ApiEvents", "Processing event type 'DowntimeStarted'.");
@ -335,13 +366,16 @@ void ApiEvents::DowntimeStartedHandler(const Downtime::Ptr& downtime)
for (const EventQueue::Ptr& queue : queues) {
queue->ProcessEvent(result);
}
inboxes.Push(std::move(result));
}
void ApiEvents::DowntimeTriggeredHandler(const Downtime::Ptr& downtime)
{
std::vector<EventQueue::Ptr> queues = EventQueue::GetQueuesForType("DowntimeTriggered");
auto inboxes (EventsRouter::GetInstance().GetInboxes(EventType::DowntimeTriggered));
if (queues.empty())
if (queues.empty() && !inboxes)
return;
Log(LogDebug, "ApiEvents", "Processing event type 'DowntimeTriggered'.");
@ -355,4 +389,6 @@ void ApiEvents::DowntimeTriggeredHandler(const Downtime::Ptr& downtime)
for (const EventQueue::Ptr& queue : queues) {
queue->ProcessEvent(result);
}
inboxes.Push(std::move(result));
}

259
lib/remote/eventqueue.cpp
View File

@ -1,5 +1,6 @@
/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
#include "config/configcompiler.hpp"
#include "remote/eventqueue.hpp"
#include "remote/filterutility.hpp"
#include "base/io-engine.hpp"
@ -7,6 +8,10 @@
#include "base/logger.hpp"
#include "base/utility.hpp"
#include <boost/asio/spawn.hpp>
#include <boost/date_time/posix_time/posix_time_duration.hpp>
#include <boost/date_time/posix_time/ptime.hpp>
#include <boost/system/error_code.hpp>
#include <utility>
using namespace icinga;
@ -85,55 +90,6 @@ void EventQueue::SetFilter(std::unique_ptr<Expression> filter)
m_Filter.swap(filter);
}
Dictionary::Ptr EventQueue::WaitForEvent(void *client, double timeout)
{
boost::mutex::scoped_lock lock(m_Mutex);
for (;;) {
auto it = m_Events.find(client);
ASSERT(it != m_Events.end());
if (!it->second.empty()) {
Dictionary::Ptr result = *it->second.begin();
it->second.pop_front();
return result;
}
if (!m_CV.timed_wait(lock, boost::posix_time::milliseconds(long(timeout * 1000))))
return nullptr;
}
}
Dictionary::Ptr EventQueue::WaitForEvent(void *client, boost::asio::yield_context yc, double timeout)
{
double deadline = -1.0;
for (;;) {
{
boost::mutex::scoped_try_lock lock(m_Mutex);
if (lock.owns_lock()) {
auto it = m_Events.find(client);
ASSERT(it != m_Events.end());
if (it->second.empty()) {
if (deadline == -1.0) {
deadline = Utility::GetTime() + timeout;
} else if (Utility::GetTime() >= deadline) {
return nullptr;
}
} else {
Dictionary::Ptr result = *it->second.begin();
it->second.pop_front();
return result;
}
}
}
IoBoundWorkSlot dontLockTheIoThreadWhileWaiting (yc);
}
}
std::vector<EventQueue::Ptr> EventQueue::GetQueuesForType(const String& type)
{
EventQueueRegistry::ItemMap queues = EventQueueRegistry::GetInstance()->GetItems();
@ -168,3 +124,208 @@ EventQueueRegistry *EventQueueRegistry::GetInstance()
{
return Singleton<EventQueueRegistry>::GetInstance();
}
std::mutex EventsInbox::m_FiltersMutex;
std::map<String, EventsInbox::Filter> EventsInbox::m_Filters ({{"", EventsInbox::Filter{1, nullptr}}});
EventsRouter EventsRouter::m_Instance;
EventsInbox::EventsInbox(String filter, const String& filterSource)
: m_Timer(IoEngine::Get().GetIoService())
{
std::unique_lock<std::mutex> lock (m_FiltersMutex);
m_Filter = m_Filters.find(filter);
if (m_Filter == m_Filters.end()) {
lock.unlock();
auto expr (ConfigCompiler::CompileText(filterSource, filter));
lock.lock();
m_Filter = m_Filters.find(filter);
if (m_Filter == m_Filters.end()) {
m_Filter = m_Filters.emplace(std::move(filter), Filter{1, std::shared_ptr<Expression>(expr.release())}).first;
} else {
++m_Filter->second.Refs;
}
} else {
++m_Filter->second.Refs;
}
}
EventsInbox::~EventsInbox()
{
std::unique_lock<std::mutex> lock (m_FiltersMutex);
if (!--m_Filter->second.Refs) {
m_Filters.erase(m_Filter);
}
}
const std::shared_ptr<Expression>& EventsInbox::GetFilter()
{
return m_Filter->second.Expr;
}
void EventsInbox::Push(Dictionary::Ptr event)
{
std::unique_lock<std::mutex> lock (m_Mutex);
m_Queue.emplace(std::move(event));
m_Timer.expires_at(boost::posix_time::neg_infin);
}
Dictionary::Ptr EventsInbox::Shift(boost::asio::yield_context yc, double timeout)
{
std::unique_lock<std::mutex> lock (m_Mutex, std::defer_lock);
m_Timer.expires_at(boost::posix_time::neg_infin);
{
boost::system::error_code ec;
while (!lock.try_lock()) {
m_Timer.async_wait(yc[ec]);
}
}
if (m_Queue.empty()) {
m_Timer.expires_from_now(boost::posix_time::milliseconds((unsigned long)(timeout * 1000.0)));
lock.unlock();
{
boost::system::error_code ec;
m_Timer.async_wait(yc[ec]);
while (!lock.try_lock()) {
m_Timer.async_wait(yc[ec]);
}
}
if (m_Queue.empty()) {
return nullptr;
}
}
auto event (std::move(m_Queue.front()));
m_Queue.pop();
return std::move(event);
}
EventsSubscriber::EventsSubscriber(std::set<EventType> types, String filter, const String& filterSource)
: m_Types(std::move(types)), m_Inbox(new EventsInbox(std::move(filter), filterSource))
{
EventsRouter::GetInstance().Subscribe(m_Types, m_Inbox);
}
EventsSubscriber::~EventsSubscriber()
{
EventsRouter::GetInstance().Unsubscribe(m_Types, m_Inbox);
}
const EventsInbox::Ptr& EventsSubscriber::GetInbox()
{
return m_Inbox;
}
EventsFilter::EventsFilter(std::map<std::shared_ptr<Expression>, std::set<EventsInbox::Ptr>> inboxes)
: m_Inboxes(std::move(inboxes))
{
}
EventsFilter::operator bool()
{
return !m_Inboxes.empty();
}
void EventsFilter::Push(Dictionary::Ptr event)
{
for (auto& perFilter : m_Inboxes) {
if (perFilter.first) {
ScriptFrame frame(true, new Namespace());
frame.Sandboxed = true;
try {
if (!FilterUtility::EvaluateFilter(frame, perFilter.first.get(), event, "event")) {
continue;
}
} catch (const std::exception& ex) {
Log(LogWarning, "EventQueue")
<< "Error occurred while evaluating event filter for queue: " << DiagnosticInformation(ex);
continue;
}
}
for (auto& inbox : perFilter.second) {
inbox->Push(event);
}
}
}
EventsRouter& EventsRouter::GetInstance()
{
return m_Instance;
}
void EventsRouter::Subscribe(const std::set<EventType>& types, const EventsInbox::Ptr& inbox)
{
const auto& filter (inbox->GetFilter());
std::unique_lock<std::mutex> lock (m_Mutex);
for (auto type : types) {
auto perType (m_Subscribers.find(type));
if (perType == m_Subscribers.end()) {
perType = m_Subscribers.emplace(type, decltype(perType->second)()).first;
}
auto perFilter (perType->second.find(filter));
if (perFilter == perType->second.end()) {
perFilter = perType->second.emplace(filter, decltype(perFilter->second)()).first;
}
perFilter->second.emplace(inbox);
}
}
void EventsRouter::Unsubscribe(const std::set<EventType>& types, const EventsInbox::Ptr& inbox)
{
const auto& filter (inbox->GetFilter());
std::unique_lock<std::mutex> lock (m_Mutex);
for (auto type : types) {
auto perType (m_Subscribers.find(type));
if (perType != m_Subscribers.end()) {
auto perFilter (perType->second.find(filter));
if (perFilter != perType->second.end()) {
perFilter->second.erase(inbox);
if (perFilter->second.empty()) {
perType->second.erase(perFilter);
}
}
if (perType->second.empty()) {
m_Subscribers.erase(perType);
}
}
}
}
EventsFilter EventsRouter::GetInboxes(EventType type)
{
std::unique_lock<std::mutex> lock (m_Mutex);
auto perType (m_Subscribers.find(type));
if (perType == m_Subscribers.end()) {
return EventsFilter({});
}
return EventsFilter(perType->second);
}

110
lib/remote/eventqueue.hpp
View File

@ -6,12 +6,17 @@
#include "remote/httphandler.hpp"
#include "base/object.hpp"
#include "config/expression.hpp"
#include <boost/asio/deadline_timer.hpp>
#include <boost/asio/spawn.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/thread/condition_variable.hpp>
#include <cstddef>
#include <cstdint>
#include <mutex>
#include <set>
#include <map>
#include <deque>
#include <queue>
namespace icinga
{
@ -31,9 +36,6 @@ public:
void SetTypes(const std::set<String>& types);
void SetFilter(std::unique_ptr<Expression> filter);
Dictionary::Ptr WaitForEvent(void *client, double timeout = 5);
Dictionary::Ptr WaitForEvent(void *client, boost::asio::yield_context yc, double timeout = 5);
static std::vector<EventQueue::Ptr> GetQueuesForType(const String& type);
static void UnregisterIfUnused(const String& name, const EventQueue::Ptr& queue);
@ -64,6 +66,108 @@ public:
static EventQueueRegistry *GetInstance();
};
enum class EventType : uint_fast8_t
{
AcknowledgementCleared,
AcknowledgementSet,
CheckResult,
CommentAdded,
CommentRemoved,
DowntimeAdded,
DowntimeRemoved,
DowntimeStarted,
DowntimeTriggered,
Flapping,
Notification,
StateChange
};
class EventsInbox : public Object
{
public:
DECLARE_PTR_TYPEDEFS(EventsInbox);
EventsInbox(String filter, const String& filterSource);
EventsInbox(const EventsInbox&) = delete;
EventsInbox(EventsInbox&&) = delete;
EventsInbox& operator=(const EventsInbox&) = delete;
EventsInbox& operator=(EventsInbox&&) = delete;
~EventsInbox();
const std::shared_ptr<Expression>& GetFilter();
void Push(Dictionary::Ptr event);
Dictionary::Ptr Shift(boost::asio::yield_context yc, double timeout = 5);
private:
struct Filter
{
std::size_t Refs;
std::shared_ptr<Expression> Expr;
};
static std::mutex m_FiltersMutex;
static std::map<String, Filter> m_Filters;
std::mutex m_Mutex;
decltype(m_Filters.begin()) m_Filter;
std::queue<Dictionary::Ptr> m_Queue;
boost::asio::deadline_timer m_Timer;
};
class EventsSubscriber
{
public:
EventsSubscriber(std::set<EventType> types, String filter, const String& filterSource);
EventsSubscriber(const EventsSubscriber&) = delete;
EventsSubscriber(EventsSubscriber&&) = delete;
EventsSubscriber& operator=(const EventsSubscriber&) = delete;
EventsSubscriber& operator=(EventsSubscriber&&) = delete;
~EventsSubscriber();
const EventsInbox::Ptr& GetInbox();
private:
std::set<EventType> m_Types;
EventsInbox::Ptr m_Inbox;
};
class EventsFilter
{
public:
EventsFilter(std::map<std::shared_ptr<Expression>, std::set<EventsInbox::Ptr>> inboxes);
operator bool();
void Push(Dictionary::Ptr event);
private:
std::map<std::shared_ptr<Expression>, std::set<EventsInbox::Ptr>> m_Inboxes;
};
class EventsRouter
{
public:
static EventsRouter& GetInstance();
void Subscribe(const std::set<EventType>& types, const EventsInbox::Ptr& inbox);
void Unsubscribe(const std::set<EventType>& types, const EventsInbox::Ptr& inbox);
EventsFilter GetInboxes(EventType type);
private:
static EventsRouter m_Instance;
EventsRouter() = default;
EventsRouter(const EventsRouter&) = delete;
EventsRouter(EventsRouter&&) = delete;
EventsRouter& operator=(const EventsRouter&) = delete;
EventsRouter& operator=(EventsRouter&&) = delete;
~EventsRouter() = default;
std::mutex m_Mutex;
std::map<EventType, std::map<std::shared_ptr<Expression>, std::set<EventsInbox::Ptr>>> m_Subscribers;
};
}
#endif /* EVENTQUEUE_H */

62
lib/remote/eventshandler.cpp
View File

@ -12,11 +12,30 @@
#include <boost/asio/buffer.hpp>
#include <boost/asio/write.hpp>
#include <boost/algorithm/string/replace.hpp>
#include <map>
#include <set>
using namespace icinga;
REGISTER_URLHANDLER("/v1/events", EventsHandler);
const std::map<String, EventType> l_EventTypes ({
{"AcknowledgementCleared", EventType::AcknowledgementCleared},
{"AcknowledgementSet", EventType::AcknowledgementSet},
{"CheckResult", EventType::CheckResult},
{"CommentAdded", EventType::CommentAdded},
{"CommentRemoved", EventType::CommentRemoved},
{"DowntimeAdded", EventType::DowntimeAdded},
{"DowntimeRemoved", EventType::DowntimeRemoved},
{"DowntimeStarted", EventType::DowntimeStarted},
{"DowntimeTriggered", EventType::DowntimeTriggered},
{"Flapping", EventType::Flapping},
{"Notification", EventType::Notification},
{"StateChange", EventType::StateChange}
});
const String l_ApiQuery ("<API query>");
bool EventsHandler::HandleRequest(
AsioTlsStream& stream,
const ApiUser::Ptr& user,
@ -63,65 +82,52 @@ bool EventsHandler::HandleRequest(
return true;
}
String filter = HttpUtility::GetLastParameter(params, "filter");
std::set<EventType> eventTypes;
std::unique_ptr<Expression> ufilter;
{
ObjectLock olock(types);
for (const String& type : types) {
auto typeId (l_EventTypes.find(type));
if (!filter.IsEmpty())
ufilter = ConfigCompiler::CompileText("<API query>", filter);
/* create a new queue or update an existing one */
EventQueue::Ptr queue = EventQueue::GetByName(queueName);
if (!queue) {
queue = new EventQueue(queueName);
EventQueue::Register(queueName, queue);
if (typeId != l_EventTypes.end()) {
eventTypes.emplace(typeId->second);
}
}
}
queue->SetTypes(types->ToSet<String>());
queue->SetFilter(std::move(ufilter));
queue->AddClient(&request);
Defer removeClient ([&queue, &request, &queueName]() {
queue->RemoveClient(&request);
EventQueue::UnregisterIfUnused(queueName, queue);
});
EventsSubscriber subscriber (std::move(eventTypes), HttpUtility::GetLastParameter(params, "filter"), l_ApiQuery);
server.StartStreaming();
response.result(http::status::ok);
response.set(http::field::content_type, "application/json");
{
IoBoundWorkSlot dontLockTheIoThreadWhileWriting (yc);
IoBoundWorkSlot dontLockTheIoThread (yc);
http::async_write(stream, response, yc);
stream.async_flush(yc);
}
asio::const_buffer newLine ("\n", 1);
AsioConditionVariable dontLockOwnStrand (stream.get_io_service(), true);
for (;;) {
auto event (queue->WaitForEvent(&request, yc));
auto event (subscriber.GetInbox()->Shift(yc));
if (event) {
CpuBoundWork buildingResponse (yc);
String body = JsonEncode(event);
boost::algorithm::replace_all(body, "\n", "");
asio::const_buffer payload (body.CStr(), body.GetLength());
IoBoundWorkSlot dontLockTheIoThreadWhileWriting (yc);
buildingResponse.Done();
asio::async_write(stream, payload, yc);
asio::async_write(stream, newLine, yc);
stream.async_flush(yc);
} else if (server.Disconnected()) {
return true;
} else {
dontLockOwnStrand.Wait(yc);
}
}
}