/// <summary>
/// Parse the list of events (oldest first) and apply the logic: is there an event WARN or CRITICAL that is not followed by a OK?
/// </summary>
/// <param name="pEventList"></param>
/// <returns></returns>
private static NagiosEventState ComputeCurrentStatus(SortedList <int, NagEvent> pEventList)
{
if (pEventList == null || pEventList.Count == 0)
{
return(NagiosEventState.OK);
}
//go through all the events and set the fixed/not fixed status
for (int i = 0; i < pEventList.Count; i++)
{
NagEvent e = pEventList.Values[i];
//skip OK states
if (e.mState == NagiosEventState.OK)
{
continue;
}
for (int j = i + 1; j < pEventList.Count; j++)
{
NagEvent efix = pEventList.Values[j];
if (e.mHost == efix.mHost && e.mService == efix.mService)
{
//same host, same service
//is it a fix ?
if (efix.mState == NagiosEventState.OK)
{
e.mFixed = true;
break;
}
}
}
}
//now check if there's "not fixed" issues
NagiosEventState vResult = NagiosEventState.OK;
for (int i = 0; i < pEventList.Count; i++)
{
NagEvent e = pEventList.Values[i];
if (!e.mFixed)
{
//if ok get wrong
if (vResult == NagiosEventState.OK)
{
vResult = e.mState;
}
else
{
//if warn stay warn or escalate
if (vResult == NagiosEventState.WARNING)
{
vResult = e.mState;
}
}
}
}
return(vResult);
}
/// <summary>
/// Checks the status of Nagios using a custom report: all the HARD alerts over the last 7 days
/// </summary>
/// <returns></returns>
public NagiosEventState CheckStatus()
{
try {
HttpWebRequest vRequest = (HttpWebRequest)WebRequest.Create(this.mNagiosURL);
vRequest.Credentials = new NetworkCredential(this.mNagiosLogin, this.mNagiosPassword);
vRequest.PreAuthenticate = true;
using (WebResponse vResponse = vRequest.GetResponse()) {
using (StreamReader vSR = new StreamReader(vResponse.GetResponseStream())) {
string vLine = null;
//trash everything line by line before the table
do
{
vLine = vSR.ReadLine().Trim();
if (vLine == null)
{
//something wrong happened
throw new Exception("Could not get content table from Nagios.");
}
}while (!TABLE_START.Equals(vLine, StringComparison.InvariantCultureIgnoreCase));
//now we're in the table, parse it
int vEventUIDCount = int.MaxValue;
SortedList <int, NagEvent> vEventList = new SortedList <int, NagEvent>();
do
{
vLine = vSR.ReadLine().Trim();
if (vLine == null)
{
//something wrong happened
throw new Exception("Unexpected EOF from Nagios");
}
NagEvent vEvt = NagEvent.Parse(vLine, this.mIgnoreBefore);
if (vEvt != null)
{
//exclude servers we don't want to see
if (!HOST_IGNORE_PATTERN.Any(s => vEvt.mHost.Contains(s)))
{
vEvt.UID = vEventUIDCount--;
vEventList.Add(vEvt.UID, vEvt);
}
}
}while (!TABLE_END.Equals(vLine, StringComparison.InvariantCultureIgnoreCase));
//now we have an ordered list of events. Let's extract the status
NagiosEventState vResult = ComputeCurrentStatus(vEventList);
if (this.mLogLineCallback != null)
{
this.mLogLineCallback("Successfully checked Nagios status with result : " + vResult);
}
return(vResult);
}
}
}
catch (Exception ex) {
string vErrMsg = "ERROR getting Nagios data: " + ex.Message;
Debug.WriteLine(vErrMsg);
if (this.mLogLineCallback != null)
{
this.mLogLineCallback(vErrMsg);
}
return(NagiosEventState.WARNING);
}
}
