Use fewer threads for plugin-based checks.

Fixes #5748

components/compat/checkresultreader.cpp

@@ -133,7 +133,10 @@ void CheckResultReader::ProcessCheckResultFile(const String& path) const
 		return;
 	}
 
-	CheckResult::Ptr result = PluginUtility::ParseCheckOutput(attrs["output"]);
+	CheckResult::Ptr result = make_shared<CheckResult>();
+	std::pair<String, Value> co = PluginUtility::ParseCheckOutput(attrs["output"]);
+	result->SetOutput(co.first);
+	result->SetPerformanceData(co.second);
 	result->SetState(PluginUtility::ExitStatusToState(Convert::ToLong(attrs["return_code"])));
 	result->SetExecutionStart(Convert::ToDouble(attrs["start_time"]));
 	result->SetExecutionEnd(Convert::ToDouble(attrs["finish_time"]));

lib/base/process-unix.cpp

@@ -21,6 +21,7 @@
 #include "base/exception.h"
 #include "base/convert.h"
 #include "base/objectlock.h"
+#include "base/initialize.h"
 #include "base/logger_fwd.h"
 #include "base/utility.h"
 #include "base/scriptvariable.h"
@@ -43,11 +44,104 @@ extern char **environ;
 #define environ (*_NSGetEnviron())
 #endif /* __APPLE__ */
 
-ProcessResult Process::Run(void)
-{
-	ProcessResult result;
+static boost::mutex l_ProcessMutex;
+static std::map<int, Process::Ptr> l_Processes;
+static int l_EventFDs[2];
 
-	result.ExecutionStart = Utility::GetTime();
+INITIALIZE_ONCE(&Process::StaticInitialize);
+
+void Process::StaticInitialize(void)
+{
+#ifdef HAVE_PIPE2
+	if (pipe2(l_EventFDs, O_CLOEXEC) < 0) {
+		BOOST_THROW_EXCEPTION(posix_error()
+		    << boost::errinfo_api_function("pipe2")
+		    << boost::errinfo_errno(errno));
+	}
+#else /* HAVE_PIPE2 */
+	if (pipe(l_EventFDs) < 0) {
+		BOOST_THROW_EXCEPTION(posix_error()
+		    << boost::errinfo_api_function("pipe")
+		    << boost::errinfo_errno(errno));
+	}
+
+	Utility::SetCloExec(fds[0]);
+	Utility::SetCloExec(fds[1]);
+#endif /* HAVE_PIPE2 */
+
+	Utility::SetNonBlocking(l_EventFDs[0]);
+	Utility::SetNonBlocking(l_EventFDs[1]);
+
+	boost::thread t(&Process::IOThreadProc);
+	t.detach();
+}
+
+void Process::IOThreadProc(void)
+{
+	pollfd *pfds = NULL;
+	int count = 0;
+
+	for (;;) {
+		double timeout = 1;
+
+		{
+			boost::mutex::scoped_lock lock(l_ProcessMutex);
+
+			count = 1 + l_Processes.size();
+			pfds = reinterpret_cast<pollfd *>(realloc(pfds, sizeof(pollfd) * count));
+
+			pfds[0].fd = l_EventFDs[0];
+			pfds[0].events = POLLIN;
+			pfds[0].revents = 0;
+
+			int i = 1;
+			std::pair<int, Process::Ptr> kv;
+			BOOST_FOREACH(kv, l_Processes) {
+				pfds[i].fd = kv.second->m_FD;
+				pfds[i].events = POLLIN;
+				pfds[i].revents = 0;
+
+				if (kv.second->GetTimeout() != 0 && kv.second->GetTimeout() < timeout)
+				    timeout = kv.second->GetTimeout();
+
+				i++;
+			}
+		}
+
+		int rc = poll(pfds, count, timeout * 1000);
+
+		if (rc < 0)
+			continue;
+
+		{
+			boost::mutex::scoped_lock lock(l_ProcessMutex);
+
+			if (pfds[0].revents & (POLLIN|POLLHUP|POLLERR)) {
+				char buffer[512];
+				(void) read(l_EventFDs[0], buffer, sizeof(buffer));
+			}
+
+			for (int i = 1; i < count; i++) {
+				if (pfds[i].revents & (POLLIN|POLLHUP|POLLERR)) {
+					std::map<int, Process::Ptr>::iterator it;
+					it = l_Processes.find(pfds[i].fd);
+
+					if (it == l_Processes.end())
+						continue; /* This should never happen. */
+
+					if (!it->second->DoEvents()) {
+						(void) close(it->first);
+						l_Processes.erase(it);
+					}
+				}
+			}
+		}
+	}
+}
+
+void Process::Run(const boost::function<void (const ProcessResult&)>& callback)
+{
+	m_Result.ExecutionStart = Utility::GetTime();
 
 	int fds[2];
 
@@ -159,51 +253,51 @@ ProcessResult Process::Run(void)
 
 	delete [] envp;
 
-	int fd = fds[0];
 	(void) close(fds[1]);
 
-	char buffer[512];
+	Utility::SetNonBlocking(fds[0]);
 
-	std::ostringstream outputStream;
+	m_FD = fds[0];
+	m_Callback = callback;
 
-	pollfd pfd;
-	pfd.fd = fd;
-	pfd.events = POLLIN;
-	pfd.revents = 0;
+	{
+		boost::mutex::scoped_lock lock(l_ProcessMutex);
+		l_Processes[m_FD] = GetSelf();
+	}
 
-	for (;;) {
-		int rc1, timeout;
+	(void) write(l_EventFDs[1], "T", 1);
+}
 
-		timeout = 0;
+bool Process::DoEvents(void)
+{
+	if (m_Timeout != 0) {
+		double timeout = m_Timeout - (Utility::GetTime() - m_Result.ExecutionStart);
 
-		if (m_Timeout != 0) {
-			timeout = m_Timeout - (Utility::GetTime() - result.ExecutionStart);
-
-			if (timeout < 0) {
-				outputStream << "<Timeout exceeded.>";
-				kill(m_Pid, SIGKILL);
-				break;
-			}
-		}
-
-		rc1 = poll(&pfd, 1, timeout * 1000);
-
-		if (rc1 > 0) {
-			int rc2 = read(fd, buffer, sizeof(buffer));
-
-			if (rc2 <= 0)
-				break;
-
-			outputStream.write(buffer, rc2);
+		if (timeout < 0) {
+			m_OutputStream << "<Timeout exceeded.>";
+			kill(m_Pid, SIGKILL);
 		}
 	}
 
-	String output = outputStream.str();
+	char buffer[512];
+	for (;;) {
+		int rc = read(m_FD, buffer, sizeof(buffer));
+
+		if (rc < 0 && (errno == EAGAIN || errno == EWOULDBLOCK))
+			return true;
+
+		if (rc > 0) {
+			m_OutputStream.write(buffer, rc);
+			return true;
+		}
+
+		break;
+	}
+
+	String output = m_OutputStream.str();
 
 	int status, exitcode;
 
-	(void) close(fd);
-
 	if (waitpid(m_Pid, &status, 0) != m_Pid) {
 		BOOST_THROW_EXCEPTION(posix_error()
 		    << boost::errinfo_api_function("waitpid")
@@ -221,11 +315,14 @@ ProcessResult Process::Run(void)
 		exitcode = 128;
 	}
 
-	result.ExecutionEnd = Utility::GetTime();
-	result.ExitStatus = exitcode;
-	result.Output = output;
+	m_Result.ExecutionEnd = Utility::GetTime();
+	m_Result.ExitStatus = exitcode;
+	m_Result.Output = output;
 
-	return result;
+	if (m_Callback)
+		m_Callback(m_Result);
+
+	return false;
 }
 
 #endif /* _WIN32 */

lib/base/process.h

@@ -63,9 +63,14 @@ public:
 	void SetTimeout(double timeout);
 	double GetTimeout(void) const;
 
-	ProcessResult Run(void);
+	void Run(const boost::function<void (const ProcessResult&)>& callback = boost::function<void (const ProcessResult&)>());
 
 	static std::vector<String> SplitCommand(const Value& command);
+
+#ifndef _WIN32
+	static void StaticInitialize(void);
+#endif /* _WIN32 */
+
 private:
 	std::vector<String> m_Arguments;
 	Dictionary::Ptr m_ExtraEnvironment;
@@ -74,7 +79,13 @@ private:
 
 #ifndef _WIN32
 	pid_t m_Pid;
+	int m_FD;
+	std::ostringstream m_OutputStream;
+	boost::function<void (const ProcessResult&)> m_Callback;
+	ProcessResult m_Result;
 
+	static void IOThreadProc(void);
+	bool DoEvents(void);
 #endif /* _WIN32 */
 };
 

lib/icinga/checkcommand.cpp

@@ -24,9 +24,10 @@ using namespace icinga;
 
 REGISTER_TYPE(CheckCommand);
 
-CheckResult::Ptr CheckCommand::Execute(const Service::Ptr& service)
+void CheckCommand::Execute(const Service::Ptr& service, const CheckResult::Ptr& cr)
 {
 	std::vector<Value> arguments;
 	arguments.push_back(service);
-	return InvokeMethod("execute", arguments);
+	arguments.push_back(cr);
+	InvokeMethod("execute", arguments);
 }

lib/icinga/checkcommand.h

@@ -37,7 +37,7 @@ public:
 	DECLARE_PTR_TYPEDEFS(CheckCommand);
 	DECLARE_TYPENAME(CheckCommand);
 
-	virtual CheckResult::Ptr Execute(const Service::Ptr& service);
+	virtual void Execute(const Service::Ptr& service, const CheckResult::Ptr& cr);
 };
 
 }

lib/icinga/externalcommandprocessor.cpp

@@ -234,7 +234,10 @@ void ExternalCommandProcessor::ProcessHostCheckResult(double time, const std::ve
 		BOOST_THROW_EXCEPTION(std::invalid_argument("Got passive check result for host '" + arguments[0] + "' which has passive checks disabled."));
 
 	int exitStatus = Convert::ToDouble(arguments[1]);
-	CheckResult::Ptr result = PluginUtility::ParseCheckOutput(arguments[2]);
+	CheckResult::Ptr result = make_shared<CheckResult>();
+	std::pair<String, Value> co = PluginUtility::ParseCheckOutput(arguments[2]);
+	result->SetOutput(co.first);
+	result->SetPerformanceData(co.second);
 
 	ServiceState state;
 
@@ -281,7 +284,10 @@ void ExternalCommandProcessor::ProcessServiceCheckResult(double time, const std:
 		BOOST_THROW_EXCEPTION(std::invalid_argument("Got passive check result for service '" + arguments[1] + "' which has passive checks disabled."));
 
 	int exitStatus = Convert::ToDouble(arguments[2]);
-	CheckResult::Ptr result = PluginUtility::ParseCheckOutput(arguments[3]);
+	CheckResult::Ptr result = make_shared<CheckResult>();
+	std::pair<String, Value> co = PluginUtility::ParseCheckOutput(arguments[3]);
+	result->SetOutput(co.first);
+	result->SetPerformanceData(co.second);
 	result->SetState(PluginUtility::ExitStatusToState(exitStatus));
 
 	result->SetScheduleStart(time);

lib/icinga/pluginutility.cpp

@@ -49,10 +49,8 @@ ServiceState PluginUtility::ExitStatusToState(int exitStatus)
 	}
 }
 
-CheckResult::Ptr PluginUtility::ParseCheckOutput(const String& output)
+std::pair<String, Value> PluginUtility::ParseCheckOutput(const String& output)
 {
-	CheckResult::Ptr result = make_shared<CheckResult>();
-
 	String text;
 	String perfdata;
 
@@ -79,10 +77,7 @@ CheckResult::Ptr PluginUtility::ParseCheckOutput(const String& output)
 
 	boost::algorithm::trim(perfdata);
 
-	result->SetOutput(text);
-	result->SetPerformanceData(ParsePerfdata(perfdata));
-
-	return result;
+	return std::make_pair(text, ParsePerfdata(perfdata));
 }
 
 Value PluginUtility::ParsePerfdata(const String& perfdata)

lib/icinga/pluginutility.h

@@ -39,7 +39,7 @@ class I2_ICINGA_API PluginUtility
 {
 public:
 	static ServiceState ExitStatusToState(int exitStatus);
-	static CheckResult::Ptr ParseCheckOutput(const String& output);
+	static std::pair<String, Value> ParseCheckOutput(const String& output);
 
 	static Value ParsePerfdata(const String& perfdata);
 	static String FormatPerfdata(const Value& perfdata);

lib/icinga/service-check.cpp

@@ -220,6 +220,11 @@ void Service::SetMaxCheckAttempts(int attempts)
 
 void Service::ProcessCheckResult(const CheckResult::Ptr& cr, const String& authority)
 {
+	{
+		ObjectLock olock(this);
+		m_CheckRunning = false;
+	}
+
 	double now = Utility::GetTime();
 
 	if (cr->GetScheduleStart() == 0)
@@ -500,55 +505,20 @@ void Service::ExecuteCheck(void)
 		SetLastReachable(reachable);
 	}
 
+	UpdateNextCheck();
+
 	/* keep track of scheduling info in case the check type doesn't provide its own information */
 	double scheduled_start = GetNextCheck();
 	double before_check = Utility::GetTime();
 
 	Service::Ptr self = GetSelf();
 
-	CheckResult::Ptr result;
+	CheckResult::Ptr result = make_shared<CheckResult>();
 
-	try {
-		result = GetCheckCommand()->Execute(GetSelf());
-	} catch (const std::exception& ex) {
-		std::ostringstream msgbuf;
-		msgbuf << "Exception occured during check for service '"
-		       << GetName() << "': " << DiagnosticInformation(ex);
-		String message = msgbuf.str();
+	result->SetScheduleStart(scheduled_start);
+	result->SetExecutionStart(before_check);
 
-		Log(LogWarning, "icinga", message);
-
-		result = make_shared<CheckResult>();
-		result->SetState(StateUnknown);
-		result->SetOutput(message);
-	}
-
-	double after_check = Utility::GetTime();
-
-	if (result) {
-		if (result->GetScheduleStart() == 0)
-			result->SetScheduleStart(scheduled_start);
-
-		if (result->GetScheduleEnd() == 0)
-			result->SetScheduleEnd(after_check);
-
-		if (result->GetExecutionStart() == 0)
-			result->SetExecutionStart(before_check);
-
-		if (result->GetExecutionEnd() == 0)
-			result->SetExecutionEnd(after_check);
-	}
-
-	/* update next check before processing any result */
-	UpdateNextCheck();
-
-	if (result)
-		ProcessCheckResult(result);
-
-	{
-		ObjectLock olock(this);
-		m_CheckRunning = false;
-	}
+	Utility::QueueAsyncCallback(boost::bind(&CheckCommand::Execute, GetCheckCommand(), GetSelf(), result));
 }
 
 void Service::UpdateStatistics(const CheckResult::Ptr& cr)

lib/methods/icingachecktask.cpp

@@ -31,7 +31,7 @@ using namespace icinga;
 
 REGISTER_SCRIPTFUNCTION(IcingaCheck, &IcingaCheckTask::ScriptFunc);
 
-CheckResult::Ptr IcingaCheckTask::ScriptFunc(const Service::Ptr&)
+void IcingaCheckTask::ScriptFunc(const Service::Ptr& service, const CheckResult::Ptr& cr)
 {
 	double interval = Utility::GetTime() - Application::GetStartTime();
 
@@ -79,12 +79,11 @@ CheckResult::Ptr IcingaCheckTask::ScriptFunc(const Service::Ptr&)
 	perfdata->Set("num_hosts_in_downtime", hs.hosts_in_downtime);
 	perfdata->Set("num_hosts_acknowledged", hs.hosts_acknowledged);
 
-	CheckResult::Ptr cr = make_shared<CheckResult>();
 	cr->SetOutput("Icinga 2 is running.");
 	cr->SetPerformanceData(perfdata);
 	cr->SetState(StateOK);
 	cr->SetCheckSource(IcingaApplication::GetInstance()->GetNodeName());
 
-	return cr;
+	service->ProcessCheckResult(cr);
 }
 

lib/methods/icingachecktask.h

@@ -34,7 +34,7 @@ namespace icinga
 class I2_METHODS_API IcingaCheckTask
 {
 public:
-	static CheckResult::Ptr ScriptFunc(const Service::Ptr& service);
+	static void ScriptFunc(const Service::Ptr& service, const CheckResult::Ptr& cr);
 
 private:
 	IcingaCheckTask(void);

lib/methods/nullchecktask.cpp

@@ -30,7 +30,7 @@ using namespace icinga;
 
 REGISTER_SCRIPTFUNCTION(NullCheck, &NullCheckTask::ScriptFunc);
 
-CheckResult::Ptr NullCheckTask::ScriptFunc(const Service::Ptr&)
+void NullCheckTask::ScriptFunc(const Service::Ptr& service, const CheckResult::Ptr& cr)
 {
 	String output = "Hello from ";
 	output += Utility::GetHostName();
@@ -38,11 +38,10 @@ CheckResult::Ptr NullCheckTask::ScriptFunc(const Service::Ptr&)
 	Dictionary::Ptr perfdata = make_shared<Dictionary>();
 	perfdata->Set("time", Convert::ToDouble(Utility::GetTime()));
 
-	CheckResult::Ptr cr = make_shared<CheckResult>();
 	cr->SetOutput(output);
 	cr->SetPerformanceData(perfdata);
 	cr->SetState(StateOK);
 
-	return cr;
+	service->ProcessCheckResult(cr);
 }
 

lib/methods/nullchecktask.h

@@ -35,7 +35,7 @@ namespace icinga
 class I2_METHODS_API NullCheckTask
 {
 public:
-	static CheckResult::Ptr ScriptFunc(const Service::Ptr& service);
+	static void ScriptFunc(const Service::Ptr& service, const CheckResult::Ptr& cr);
 
 private:
 	NullCheckTask(void);

lib/methods/pluginchecktask.cpp

@@ -35,7 +35,7 @@ using namespace icinga;
 
 REGISTER_SCRIPTFUNCTION(PluginCheck,  &PluginCheckTask::ScriptFunc);
 
-CheckResult::Ptr PluginCheckTask::ScriptFunc(const Service::Ptr& service)
+void PluginCheckTask::ScriptFunc(const Service::Ptr& service, const CheckResult::Ptr& cr)
 {
 	CheckCommand::Ptr commandObj = service->GetCheckCommand();
 	Value raw_command = commandObj->GetCommandLine();
@@ -65,22 +65,28 @@ CheckResult::Ptr PluginCheckTask::ScriptFunc(const Service::Ptr& service)
 		}
 	}
 
+	cr->SetCommand(command);
+
 	Process::Ptr process = make_shared<Process>(Process::SplitCommand(command), envMacros);
 
 	process->SetTimeout(commandObj->GetTimeout());
 
-	ProcessResult pr = process->Run();
+	process->Run(boost::bind(&PluginCheckTask::ProcessFinishedHandler, service, cr, _1));
 
-	String output = pr.Output;
-	output.Trim();
-	CheckResult::Ptr result = PluginUtility::ParseCheckOutput(output);
-	result->SetCommand(command);
-	result->SetState(PluginUtility::ExitStatusToState(pr.ExitStatus));
-	result->SetExitStatus(pr.ExitStatus);
-	result->SetExecutionStart(pr.ExecutionStart);
-	result->SetExecutionEnd(pr.ExecutionEnd);
-	result->SetCheckSource(IcingaApplication::GetInstance()->GetNodeName());
-
-	return result;
 }
 
+void PluginCheckTask::ProcessFinishedHandler(const Service::Ptr& service, const CheckResult::Ptr& cr, const ProcessResult& pr)
+{
+	String output = pr.Output;
+	output.Trim();
+	std::pair<String, Value> co = PluginUtility::ParseCheckOutput(output);
+	cr->SetOutput(co.first);
+	cr->SetPerformanceData(co.second);
+	cr->SetState(PluginUtility::ExitStatusToState(pr.ExitStatus));
+	cr->SetExitStatus(pr.ExitStatus);
+	cr->SetExecutionStart(pr.ExecutionStart);
+	cr->SetExecutionEnd(pr.ExecutionEnd);
+	cr->SetCheckSource(IcingaApplication::GetInstance()->GetNodeName());
+
+	service->ProcessCheckResult(cr);
+}

lib/methods/pluginchecktask.h

@@ -21,6 +21,7 @@
 #define PLUGINCHECKTASK_H
 
 #include "methods/i2-methods.h"
+#include "base/process.h"
 #include "icinga/service.h"
 
 namespace icinga
@@ -34,10 +35,13 @@ namespace icinga
 class I2_METHODS_API PluginCheckTask
 {
 public:
-	static CheckResult::Ptr ScriptFunc(const Service::Ptr& service);
+	static void ScriptFunc(const Service::Ptr& service, const CheckResult::Ptr& cr);
 
 private:
 	PluginCheckTask(void);
+
+	static void ProcessFinishedHandler(const Service::Ptr& service, const CheckResult::Ptr& cr, const ProcessResult& pr);
+
 };
 
 }

lib/methods/pluginnotificationtask.cpp

@@ -82,8 +82,11 @@ void PluginNotificationTask::ScriptFunc(const Notification::Ptr& notification, c
 
 	process->SetTimeout(commandObj->GetTimeout());
 
-	ProcessResult pr = process->Run();
+	process->Run(boost::bind(&PluginNotificationTask::ProcessFinishedHandler, service, command, _1));
+}
 
+void PluginNotificationTask::ProcessFinishedHandler(const Service::Ptr& service, const Value& command, const ProcessResult& pr)
+{
 	if (pr.ExitStatus != 0) {
 		std::ostringstream msgbuf;
 		msgbuf << "Notification command '" << command << "' for service '"

lib/methods/pluginnotificationtask.h

@@ -22,6 +22,8 @@
 
 #include "methods/i2-methods.h"
 #include "icinga/notification.h"
+#include "icinga/service.h"
+#include "base/process.h"
 
 namespace icinga
 {
@@ -40,6 +42,8 @@ public:
 
 private:
 	PluginNotificationTask(void);
+
+	static void ProcessFinishedHandler(const Service::Ptr& service, const Value& command, const ProcessResult& pr);
 };
 
 }