private void HandleFailure(IWebSiteElement el, Exception ex)
{
bool sendFailure = true;
// if we've already sent a failure message, we can specify an interval before a repeat failure message is sent
if (this.mFailedSites.ContainsKey(el.Name))
{
if (DateTime.Now > this.mFailedSites[el.Name].AddMinutes(this.mConfig.RepeatMessageInterval))
{
this.mFailedSites.Remove(el.Name);
}
else
{
mLog.AddLogEntry(String.Format("Site {0} still down but notification skipped due to repeat message interval", el.Name));
sendFailure = false;
}
}
if (sendFailure)
{
mLog.LogError(ex, el.Url);
SendEmail(el, ex);
if (this.CheckFailed != null)
{
SiteEventArgs se = new SiteEventArgs(el);
this.CheckFailed(this, se);
}
// record when this failure message was generated
this.mFailedSites.Add(el.Name, DateTime.Now);
}
}
private void HandleIsOnline(IWebSiteElement el, int bytesReceived)
{
mLog.AddLogEntry(String.Format("Site OK - {0} bytes received.", bytesReceived));
if (mFailedSites.ContainsKey(el.Name))
{
mFailedSites.Remove(el.Name);
string subject = String.Format("Site back up - {0}", el.Name);
StringBuilder sb = new StringBuilder();
sb.AppendFormat("The website \"{0}\" at {1} was previously unreachable - it is now back online ({2} bytes received).",
el.Name, el.Url, bytesReceived);
SendEmail(el.EmailNotificationList, subject, sb.ToString(), MailPriority.High);
}
}
private bool CheckSite(IWebSiteElement el)
{
bool success = false;
mLog.AddLogEntry(String.Format("Testing {0} ({1})...", el.Name, el.Url));
try
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(el.Url);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream responseStream = response.GetResponseStream();
byte[] buffer = new byte[8192];
//StringBuilder sb = new StringBuilder();
int count = 0;
int totalBytes = 0;
do
{
count = responseStream.Read(buffer, 0, buffer.Length);
totalBytes += count;
//if (count > 0)
//{
// sb.Append(Encoding.ASCII.GetString(buffer, 0, count));
//}
}while (count > 0);
if ((totalBytes == 0) && (this.mConfig.ZeroBytesIsFailure))
{
throw new ApplicationException("Zero bytes returned from site");
}
HandleIsOnline(el, totalBytes);
success = true;
}
catch (Exception ex)
{
HandleFailure(el, ex);
}
mLog.NewLine();
return(success);
}
private void SendEmail(IWebSiteElement el, Exception ex)
{
string subject;
StringBuilder sb = new StringBuilder();
if (ex is WebException)
{
subject = String.Format("SITE DOWN - {0}", el.Name);
sb.AppendFormat("The web site at {0} is not responding - please investigate immediately.\n\n", el.Url);
}
else
{
subject = String.Format("Site check error - {0}", el.Name);
sb.AppendFormat("An error occurred when checking the website at {0} - please investigate immediately", el.Url);
}
sb.AppendLine();
sb.AppendFormat("Message: {0}\n\n", ex.Message);
SendEmail(el.EmailNotificationList, subject, sb.ToString(), MailPriority.High);
}
public SiteEventArgs(IWebSiteElement el)
{
this.mWebSite = el;
}
