Tony Marnell

Tony Marnell · Sep 22, 2023 go to post

I use the NotifyBecomePrimary() hook in the ZMIRROR routine to call some code to send an email.

Here's the ZMIRROR routine from the %SYS namespace:

ZMIRROR    // User-defined code for mirror environment eventsQUIT//// The member has fully become primary so it is now safe to job off processes//// 20230314 - TM - Initial version//
NotifyBecomePrimary()
    
    //// Send an alert email to notify support staff that a mirror failover has occurred//// 20230726 - TM - Initial version//set Namespace = $znspacetry {
        znspace"HAPPI"do##class(System.AlertEmail).MirrorFailover()
        znspace Namespace
    }
    catch {
        znspace Namespace
    }
    
    QUIT

The email-sending code from the application namespace references configuration data in a global and constructs a html-formatted message to inform interested parties that a mirror failover has occurred. You should be able to make out what's going on and get it working to your own needs. Here's the class:

/// Description/// -----------////// Grapevine Solutions - HAPPI////// This class implements the alert email methods for various system events.////// Revision History/// ----------------////// 20230726 - TM - Initial version///Class System.AlertEmail Extends%RegisteredObject
{

/// This method sends an alert email message when a mirror failover occurs.  It is called from/// the ZMIRROR routine in the %SYS namespace.////// Revision History/// ----------------////// 20230726 - TM - Initial version///ClassMethod MirrorFailover()
{
    // get the current timeset EmailTimeStampH = $now()
    
    // get the hostname, e.g. HCPGPO11-V, HCDDMC11-Vset HostName = $zconvert($SYSTEM.INetInfo.LocalHostName(), "U")
    
    // get the environment, e.g. LIVE, TEST, DEVset Environment = ^HAPPIConfig("HostName", HostName)
    
    // get a connection to the email serverset MailServer = ##class(%Net.SMTP).%New()
    set MailServer.smtpserver = ^HAPPIConfig("Environment", Environment, "Email", "SMTPServer")
    set MailServer.port = ^HAPPIConfig("Environment", Environment, "Email", "SMTPPort")
    
    // check for email server authentication detailsset MailServerUserName = $get(^HAPPIConfig("Environment", Environment, "Email", "Authentication", "UserName"))
    set MailServerPassword = $get(^HAPPIConfig("Environment", Environment, "Email", "Authentication", "Password"))
    
    // if there are authentication details then add them to the connectionif ((MailServerUserName '= "") & (MailServerPassword '= "")) {
        
        set MailAuthentication = ##class(%Net.Authenticator).%New()
        set MailAuthentication.UserName = MailServerUserName
        set MailAuthentication.Password = MailServerPassword
        set MailServer.authenticator = MailAuthentication
        
        }
    
    // create a new HTML-formatted mail messageset MailMessage = ##class(%Net.MailMessage).%New()
    set MailMessage.IsHTML = 1// set the recipient listset To = $order(^HAPPIConfig("Environment", Environment, "Email", "To", ""))
    while (To '= "") {
        if (^HAPPIConfig("Environment", Environment, "Email", "To", To) = 1) do MailMessage.To.Insert(To)
        set To = $order(^HAPPIConfig("Environment", Environment, "Email", "To", To))
    }
    
    // set the senderset MailMessage.From = ^HAPPIConfig("Environment", Environment, "Email", "From")
    
    // set the subjectset Subject = "Mirror Failover Alert on " _ HostName _ " (" _ Environment _ ")"set MailMessage.Subject = Subject
    
    //--------------------------------// build the message html document//--------------------------------// start of html documentdo MailMessage.TextData.WriteLine("<!DOCTYPE html>")
    do MailMessage.TextData.WriteLine("<html>")
    
    // start of headerdo MailMessage.TextData.WriteLine("<head>")

    do MailMessage.TextData.WriteLine("<meta charset=""UTF-8"">")
    do MailMessage.TextData.WriteLine("<title>" _ Subject _ "</title>")
    
    // style sheetdo MailMessage.TextData.WriteLine("<style>")
    do MailMessage.TextData.WriteLine("body {font-family: Arial, Helvetica, sans-serif;}")
    do MailMessage.TextData.WriteLine("h2 {color: blue; font-size: '125%';}")
    do MailMessage.TextData.WriteLine("h3 {color: blue; font-size: '100%';}")
    do MailMessage.TextData.WriteLine("table {border: 1px solid #ddd; border-spacing: 10px; border-collapse: separate;}")
    do MailMessage.TextData.WriteLine(".good {color: green;}")
    do MailMessage.TextData.WriteLine(".bad {color: red;}")
    do MailMessage.TextData.WriteLine("</style>")
    
    // end of headerdo MailMessage.TextData.WriteLine("</head>")
    
    // start of bodydo MailMessage.TextData.WriteLine("<body>")
    
    // write subject as message headerdo MailMessage.TextData.WriteLine("<h2>" _ Subject _ "</h2>")
    
    // write alert detailsdo MailMessage.TextData.WriteLine("<h3>Alert Details</h3>")
    do MailMessage.TextData.WriteLine("<table>")
    do MailMessage.TextData.WriteLine("<tr>")
    do MailMessage.TextData.WriteLine("<td>Application</td>")
    do MailMessage.TextData.WriteLine("<td>HAPPI</td>")
    do MailMessage.TextData.WriteLine("</tr>")
    do MailMessage.TextData.WriteLine("<tr class=""bad"">")
    do MailMessage.TextData.WriteLine("<td>Alert Reason</td>")
    do MailMessage.TextData.WriteLine("<td>Mirror Failover")
    do MailMessage.TextData.WriteLine("</tr>")
    do MailMessage.TextData.WriteLine("<tr>")
    do MailMessage.TextData.WriteLine("<td>Host Name</td>")
    do MailMessage.TextData.WriteLine("<td>" _ HostName _ "</td>")
    do MailMessage.TextData.WriteLine("</tr>")
    do MailMessage.TextData.WriteLine("<tr>")
    do MailMessage.TextData.WriteLine("<td>Environment</td>")
    do MailMessage.TextData.WriteLine("<td>" _ Environment _ "</td>")
    do MailMessage.TextData.WriteLine("</tr>")
    do MailMessage.TextData.WriteLine("<tr>")
    do MailMessage.TextData.WriteLine("<td>Alert Time</td>")
    do MailMessage.TextData.WriteLine("<td>" _ $zdatetime($System.Util.UTCtoLocalWithZTIMEZONE(EmailTimeStampH), 3, 1, 3) _ "</td>")
    do MailMessage.TextData.WriteLine("</tr>")
    do MailMessage.TextData.WriteLine("</table>")
    
    // write support instructionsdo MailMessage.TextData.WriteLine("<h3>Support Instructions</h3>")
    do MailMessage.TextData.WriteLine("<p>")
    do MailMessage.TextData.WriteLine("A mirror failover has occurred in the " _ Environment _ " environment and " _ HostName _  " is now the primary failover member.")
    do MailMessage.TextData.WriteLine("</p>")
    do MailMessage.TextData.WriteLine("<p>")
    do MailMessage.TextData.WriteLine("Please ensure that the failover has not disrupted any application processes.")
    do MailMessage.TextData.WriteLine("</p>")
    do MailMessage.TextData.WriteLine("<p>")
    do MailMessage.TextData.WriteLine("Please do not reply to this message as it was automatically generated.")
    do MailMessage.TextData.WriteLine("</p>")
    
    // end of bodydo MailMessage.TextData.WriteLine("</body>")
    
    // end of html documentdo MailMessage.TextData.WriteLine("</html>")
    
    // send the messagedo MailServer.Send(MailMessage)
    
    QUIT
}

}

Tony Marnell · Dec 9, 2015 go to post

At Grapevine Solutions we have successfully implemented a project for one of our Caché customers who had a requirement to add barcodes to some legacy character-based reports. This requirement meant moving to a modern reporting format with page-layout and graphics capabilities, along with support for generating barcodes.

We provided a custom solution using Caché and some third-party development tools that reproduced new versions of the reports in PDF format alongside the current reports. Both versions of the reports are created from the existing menu option within the legacy character-based application. Additionally, the new report layouts can be easily modified by non-developers if needed.

If you think our services would be of benefit to you please feel free to contact us.

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