/******************************************************************************
* *
* Comments: Get the value of a counter. If it is a rate counter, *
* sleep 1 second to get the second raw value. *
* *
******************************************************************************/
PDH_STATUS calculate_counter_value(const char *function, const char *counterpath, double *value)
{
PDH_HQUERY query;
PDH_HCOUNTER handle = NULL;
PDH_STATUS pdh_status;
PDH_RAW_COUNTER rawData, rawData2;
PDH_FMT_COUNTERVALUE counterValue;
if (ERROR_SUCCESS != (pdh_status = zbx_PdhOpenQuery(function, &query)))
return pdh_status;
if (ERROR_SUCCESS != (pdh_status = zbx_PdhAddCounter(function, NULL, query, counterpath, &handle)))
goto close_query;
if (ERROR_SUCCESS != (pdh_status = zbx_PdhCollectQueryData(function, counterpath, query)))
goto remove_counter;
if (ERROR_SUCCESS != (pdh_status = zbx_PdhGetRawCounterValue(function, counterpath, handle, &rawData)))
goto remove_counter;
if (PDH_CSTATUS_INVALID_DATA == (pdh_status = PdhCalculateCounterFromRawValue(handle, PDH_FMT_DOUBLE |
PDH_FMT_NOCAP100, &rawData, NULL, &counterValue)))
{
/* some (e.g., rate) counters require two raw values, MSDN lacks documentation */
/* about what happens but tests show that PDH_CSTATUS_INVALID_DATA is returned */
zbx_sleep(1);
if (ERROR_SUCCESS == (pdh_status = zbx_PdhCollectQueryData(function, counterpath, query)) &&
ERROR_SUCCESS == (pdh_status = zbx_PdhGetRawCounterValue(function, counterpath,
handle, &rawData2)))
{
pdh_status = PdhCalculateCounterFromRawValue(handle, PDH_FMT_DOUBLE | PDH_FMT_NOCAP100,
&rawData2, &rawData, &counterValue);
}
}
if (ERROR_SUCCESS != pdh_status || (PDH_CSTATUS_VALID_DATA != counterValue.CStatus &&
PDH_CSTATUS_NEW_DATA != counterValue.CStatus))
{
if (ERROR_SUCCESS == pdh_status)
pdh_status = counterValue.CStatus;
zabbix_log(LOG_LEVEL_DEBUG, "%s(): cannot calculate counter value '%s': %s",
function, counterpath, strerror_from_module(pdh_status, L"PDH.DLL"));
}
else
{
*value = counterValue.doubleValue;
}
remove_counter:
PdhRemoveCounter(handle);
close_query:
PdhCloseQuery(query);
return pdh_status;
}
void collect_perfstat()
{
const char *__function_name = "collect_perfstat";
PERF_COUNTER_DATA *cptr;
PDH_STATUS pdh_status;
time_t now;
PDH_FMT_COUNTERVALUE value;
if (SUCCEED != perf_collector_started())
return;
if (NULL == ppsd.pPerfCounterList) /* no counters */
return;
zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __function_name);
now = time(NULL);
/* refresh unsupported counters */
if (ppsd.nextcheck <= now)
{
for (cptr = ppsd.pPerfCounterList; NULL != cptr; cptr = cptr->next)
{
if (PERF_COUNTER_NOTSUPPORTED != cptr->status)
continue;
zbx_PdhAddCounter(__function_name, cptr, ppsd.pdh_query, cptr->counterpath, &cptr->handle);
}
ppsd.nextcheck = now + UNSUPPORTED_REFRESH_PERIOD;
}
/* query for new data */
if (ERROR_SUCCESS != (pdh_status = PdhCollectQueryData(ppsd.pdh_query)))
{
for (cptr = ppsd.pPerfCounterList; NULL != cptr; cptr = cptr->next)
{
if (PERF_COUNTER_NOTSUPPORTED != cptr->status)
deactivate_perf_counter(cptr);
}
zabbix_log(LOG_LEVEL_DEBUG, "%s() call to PdhCollectQueryData() failed: %s",
__function_name, strerror_from_module(pdh_status, L"PDH.DLL"));
goto out;
}
/* get the raw values */
for (cptr = ppsd.pPerfCounterList; NULL != cptr; cptr = cptr->next)
{
if (PERF_COUNTER_NOTSUPPORTED == cptr->status)
continue;
if (ERROR_SUCCESS != zbx_PdhGetRawCounterValue(__function_name, cptr->counterpath,
cptr->handle, &cptr->rawValues[cptr->olderRawValue]))
{
deactivate_perf_counter(cptr);
continue;
}
if (PERF_COUNTER_INITIALIZED < cptr->status)
{
zabbix_log(LOG_LEVEL_DEBUG, "%s() counterpath:'%s' old first:%I64d second:%I64d",
__function_name, cptr->counterpath,
cptr->rawValues[(cptr->olderRawValue + 1) & 1].FirstValue,
cptr->rawValues[(cptr->olderRawValue + 1) & 1].SecondValue);
zabbix_log(LOG_LEVEL_DEBUG, "%s() counterpath:'%s' new first:%I64d second:%I64d",
__function_name, cptr->counterpath,
cptr->rawValues[cptr->olderRawValue].FirstValue,
cptr->rawValues[cptr->olderRawValue].SecondValue);
}
cptr->olderRawValue = (cptr->olderRawValue + 1) & 1;
pdh_status = PdhCalculateCounterFromRawValue(cptr->handle, PDH_FMT_DOUBLE | PDH_FMT_NOCAP100,
&cptr->rawValues[(cptr->olderRawValue + 1) & 1],
(PERF_COUNTER_INITIALIZED < cptr->status ? &cptr->rawValues[cptr->olderRawValue] : NULL),
&value);
if (ERROR_SUCCESS == pdh_status && PDH_CSTATUS_VALID_DATA != value.CStatus &&
PDH_CSTATUS_NEW_DATA != value.CStatus)
{
pdh_status = value.CStatus;
}
if (PDH_CSTATUS_INVALID_DATA == pdh_status)
{
/* some (e.g., rate) counters require two raw values, MSDN lacks documentation */
/* about what happens but tests show that PDH_CSTATUS_INVALID_DATA is returned */
cptr->status = PERF_COUNTER_GET_SECOND_VALUE;
continue;
}
if (PDH_CALC_NEGATIVE_DENOMINATOR == pdh_status)
{
/* This counter type shows the average percentage of active time observed during the sample */
/* interval. This is an inverse counter. Inverse counters are calculated by monitoring the */
/* percentage of time that the service was inactive and then subtracting that value from 100 */
/* percent. The formula used to calculate the counter value is: */
/* (1 - (inactive time delta) / (total time delta)) x 100 */
/* For some unknown reason sometimes the collected row values indicate that inactive delta is */
/* greater than total time delta. There must be some kind of bug in how performance counters */
/* work. When this happens function PdhCalculateCounterFromRawValue() returns error */
/* PDH_CALC_NEGATIVE_DENOMINATOR. Basically this means that an item was inactive all the time */
/* so we set the return value to 0.0 and change status to indicate success. */
/* More info: technet.microsoft.com/en-us/library/cc757283(WS.10).aspx */
zabbix_log(LOG_LEVEL_DEBUG, "%s() counterpath:'%s'"
" negative denominator error is treated as 0.0",
__function_name, cptr->counterpath);
pdh_status = ERROR_SUCCESS;
value.doubleValue = 0.0; /* 100% inactive */
}
if (ERROR_SUCCESS == pdh_status)
{
zabbix_log(LOG_LEVEL_DEBUG, "%s() '%s' calculated value:" ZBX_FS_DBL, __function_name,
cptr->counterpath, value.doubleValue);
cptr->status = PERF_COUNTER_ACTIVE;
cptr->value_current = (cptr->value_current + 1) % cptr->interval;
if (cptr->value_count == cptr->interval)
cptr->sum -= cptr->value_array[cptr->value_current]; /* remove the oldest value, value_count will not increase */
cptr->value_array[cptr->value_current] = value.doubleValue;
cptr->sum += cptr->value_array[cptr->value_current];
if (cptr->value_count < cptr->interval)
cptr->value_count++;
}
else
{
zabbix_log(LOG_LEVEL_WARNING, "cannot calculate performance counter value \"%s\": %s",
cptr->counterpath, strerror_from_module(pdh_status, L"PDH.DLL"));
deactivate_perf_counter(cptr);
}
}
out:
zabbix_log(LOG_LEVEL_DEBUG, "End of %s()", __function_name);
}