/**   Get Free SMS alerts for your Site's Uptime and Downtime  **/

/**   Original Script by Amit Agarwal 26/03/2012  **/
/**   http://labnol.org/?p=33232  **/

/*    Modified by Shunmugha Sundaram to get SMS alerts 
      and to support multiple site monitoring- 31/03/2012 */
/*    Instructions at http://techawakening.org/?p=988 */

function isMySiteDown()
{
var i=3;
  
// Tweak the loop variable if you want to monitor more then 4 sites.
  
for (i=3;i<=6;i++)
   {
    
  // In cell E3 enter the URL of the site you want to monitor 
  
  var url = SpreadsheetApp.getActiveSheet().getRange("F"+i).getValue();
        if(url.length)
         { 
           var scriptvalue=ScriptProperties.getProperty("status"+ i);
  if (!scriptvalue) {
     ScriptProperties.setProperty("status" + i, 200);
    
  }
  
           
  var response, error; 

  try {    
    response = UrlFetchApp.fetch(url);
   
  } catch(error) 
    
  {   
   insertData(error, -1, url, i, "Website down");
   continue;
  }
  
  var code = response.getResponseCode();
  
  if (code == 200) 
  { 
    {
    insertData("Up", code, url, i, "Website up"); }
    
  }
  else
    insertData(response.getContent()[0], code,url, i,"Website down");
     //end if
          }
  else
  {
    //Don't poll it
  }
     }
}
function insertData(error, code, url, i, msg) {  
  
   
  if (ScriptProperties.getProperty("status"+i) == code)
  {
   return;
  }
     
  var sheet = SpreadsheetApp.getActiveSheet();
  var email = sheet.getRange("F5").getValue();
  var row   = sheet.getLastRow() + 1;
  var now = new Date().getTime();
  
  sheet.getRange(row,1).setValue(new Date());
  sheet.getRange(row,2).setValue(url);
  sheet.getRange(row,3).setValue(error);
  sheet.getRange(row,4).setValue(code);
  
  ScriptProperties.setProperty("status"+i, code);
  
  if(code!=200)
    
  CalendarApp.createEvent( url + ' is DOWN' ,
                            new Date(now+40000),
                            new Date(now+40000)).addSmsReminder(0);
  else
    
  CalendarApp.createEvent( url + ' is UP' ,
                            new Date(now+40000),
                            new Date(now+40000)).addSmsReminder(0);
  
 // Uncomment the below line if you want to get Email alerts too. 
  
 // MailApp.sendEmail(email, msg, error);
}