Implement the pending_queries metric for the IDO check task

refs #8688

lib/base/workqueue.cpp

@@ -166,7 +166,7 @@ void WorkQueue::ReportExceptions(const String& facility) const
 	    << exceptions.size() << " error" << (exceptions.size() != 1 ? "s" : "");
 }
 
-size_t WorkQueue::GetLength(void)
+size_t WorkQueue::GetLength(void) const
 {
 	boost::mutex::scoped_lock lock(m_Mutex);
 

lib/base/workqueue.hpp

@@ -52,7 +52,7 @@ public:
 
 	bool IsWorkerThread(void) const;
 
-	size_t GetLength(void);
+	size_t GetLength(void) const;
 
 	void SetExceptionCallback(const ExceptionCallback& callback);
 

lib/db_ido/dbconnection.hpp

@@ -72,6 +72,7 @@ public:
 	bool GetStatusUpdate(const DbObject::Ptr& dbobj) const;
 
 	int GetQueryCount(RingBuffer::SizeType span) const;
+	virtual int GetPendingQueryCount(void) const = 0;
 
 	static void ValidateFailoverTimeout(const String& location, const DbConnection::Ptr& object);
 

lib/db_ido/idochecktask.cpp

@@ -121,6 +121,7 @@ void IdoCheckTask::ScriptFunc(const Checkable::Ptr& checkable, const CheckResult
 	perfdata->Add(new PerfdataValue("queries_1min", conn->GetQueryCount(60)));
 	perfdata->Add(new PerfdataValue("queries_5mins", conn->GetQueryCount(5 * 60)));
 	perfdata->Add(new PerfdataValue("queries_15mins", conn->GetQueryCount(15 * 60)));
+	perfdata->Add(new PerfdataValue("pending_queries", conn->GetPendingQueryCount()));
 	cr->SetPerformanceData(perfdata);
 
 	checkable->ProcessCheckResult(cr);

lib/db_ido_mysql/idomysqlconnection.cpp

@@ -770,3 +770,8 @@ void IdoMysqlConnection::FillIDCache(const DbType::Ptr& type)
 		SetInsertID(type, DbReference(row->Get("object_id")), DbReference(row->Get(type->GetTable() + "_id")));
 	}
 }
+
+int IdoMysqlConnection::GetPendingQueryCount(void) const
+{
+	return m_QueryQueue.GetLength();
+}

lib/db_ido_mysql/idomysqlconnection.hpp

@@ -46,6 +46,8 @@ public:
 
 	static void StatsFunc(const Dictionary::Ptr& status, const Array::Ptr& perfdata);
 
+	virtual int GetPendingQueryCount(void) const;
+
 protected:
 	virtual void Resume(void);
 	virtual void Pause(void);

lib/db_ido_pgsql/idopgsqlconnection.cpp

@@ -781,3 +781,8 @@ void IdoPgsqlConnection::FillIDCache(const DbType::Ptr& type)
 		SetInsertID(type, DbReference(row->Get("object_id")), DbReference(row->Get(type->GetTable() + "_id")));
 	}
 }
+
+int IdoPgsqlConnection::GetPendingQueryCount(void) const
+{
+	return m_QueryQueue.GetLength();
+}

lib/db_ido_pgsql/idopgsqlconnection.hpp

@@ -46,6 +46,8 @@ public:
 
 	static void StatsFunc(const Dictionary::Ptr& status, const Array::Ptr& perfdata);
 
+	virtual int GetPendingQueryCount(void) const;
+
 protected:
 	virtual void Resume(void);
 	virtual void Pause(void);