{"id":619,"date":"2010-04-07T10:29:51","date_gmt":"2010-04-07T15:29:51","guid":{"rendered":"http:\/\/jdhitsolutions.com\/blog\/2010\/04\/hey-are-you-awake\/"},"modified":"2010-04-07T10:29:51","modified_gmt":"2010-04-07T15:29:51","slug":"hey-are-you-awake","status":"publish","type":"post","link":"https:\/\/jdhitsolutions.com\/blog\/scripting\/619\/hey-are-you-awake\/","title":{"rendered":"Hey, are you awake?"},"content":{"rendered":"

\"Validated01\"<\/a> As many of you know, one of the things I\u2019m doing these days is helping run The Experts Community<\/a> web site. As such I need to make sure it is up and running. I also like to make sure my blog and a few other sites are responding to HTTP requests. To meet this need I put together a PowerShell function to test a web site and determine if it is running or not.<\/p>\n

<\/p>\n

There are no cmdlets from Microsoft for testing web site connectivity. However, there is a .NET class called System.Net.WebRequest. I put together a short 2.0 function that uses this class and returns a custom object to the pipeline.<\/p>\n

Function<\/span> Test-WebSite<\/span> {<\/span>            \n    [<\/span>cmdletBinding<\/span>(<\/span>)<\/span>]<\/span>            \n    Param<\/span> (<\/span>            \n          [<\/span>Parameter<\/span>(<\/span>            \n           ValueFromPipeline<\/span>=<\/span>$True<\/span>,<\/span>Position<\/span>=<\/span>0<\/span>,<\/span>Mandatory<\/span>=<\/span>$True<\/span>,<\/span>            \n           HelpMessage<\/span>=<\/span>"The URL to test. Include http:\/\/ or https:\/\/"<\/span>)<\/span>]<\/span>            \n           [string]<\/span>$url<\/span>            \n           )<\/span>            \n            \n    Begin<\/span> {<\/span>            \n        Write-Verbose<\/span> "Begin function"<\/span>            \n        }<\/span>            \n    Process<\/span> {<\/span>            \n        Write-Verbose<\/span> "Requesting $url"<\/span>            \n                    \n        $wr<\/span>=<\/span>[system.net.webrequest]<\/span>::<\/span>Create<\/span>(<\/span>$url<\/span>)<\/span>                 \n        #set timeout to 7 seconds<\/span>            \n        $wr<\/span>.<\/span>Timeout<\/span>=<\/span>7000<\/span>            \n        $start<\/span>=<\/span>Get-Date<\/span>            \n                    \n        Try<\/span> {<\/span>            \n            $response<\/span>=<\/span>$wr<\/span>.<\/span>GetResponse<\/span>(<\/span>)<\/span>            \n            if<\/span> (<\/span>$response<\/span>)<\/span> {<\/span>            \n                 Write-Verbose<\/span> "Response returned"<\/span>            \n                $Status<\/span>=<\/span>$response<\/span>.<\/span>StatusCode<\/span>            \n                $StatusCode<\/span>=<\/span>(<\/span>$response<\/span>.<\/span>Statuscode<\/span> -as<\/span> [int]<\/span>)<\/span>            \n            }<\/span>            \n        }<\/span>            \n        Catch<\/span>  [system.net.webexception]<\/span> {<\/span>            \n            Write-Verbose<\/span> "Failed to get a response from $url"<\/span>            \n            Write-Warning<\/span> "Failed to get a response from $url"<\/span>            \n            $status<\/span> =<\/span>  $_<\/span>.<\/span>Exception<\/span>.<\/span>Response<\/span>.<\/span>StatusCode<\/span>            \n            $statuscode<\/span> =<\/span> (<\/span> $_<\/span>.<\/span>Exception<\/span>.<\/span>Response<\/span>.<\/span>StatusCode<\/span> -as<\/span> [int]<\/span>)<\/span>            \n        }<\/span>            \n                    \n        $end<\/span>=<\/span>Get-Date<\/span>            \n        $timespan<\/span>=<\/span>$end<\/span>-<\/span>$start<\/span>            \n        $ResponseMS<\/span>=<\/span>$timespan<\/span>.<\/span>TotalMilliseconds<\/span>            \n                          \n        Write-Verbose<\/span> "status is $status"<\/span>            \n        Write-Verbose<\/span> "statuscode is $statuscode"<\/span>            \n        Write-Verbose<\/span> "timer is $responseMS"<\/span>            \n                    \n        $obj<\/span>=<\/span>New-Object<\/span> PSObject<\/span> -Property<\/span> @{<\/span>            \n            DateTime<\/span>=<\/span>$start<\/span>            \n            URL<\/span>=<\/span>$url<\/span>            \n            Status<\/span>=<\/span>$status<\/span>            \n            StatusCode<\/span>=<\/span>$statuscode<\/span>            \n            ResponseMS<\/span>=<\/span>$ResponseMS<\/span>            \n         }<\/span>            \n         Write-Output<\/span> $obj<\/span>            \n                     \n      }<\/span> #end Process<\/span>            \n     End<\/span> {<\/span>            \n        Write-Verbose<\/span> "End function"<\/span>            \n     }<\/span>            \n}<\/span> #end function<\/span><\/pre>\n
The function takes a URL to test and it can be piped. Using a Try\/Catch construct the function attempts to get a response from the site. If it fails, then a System.Net.WebException object is caught so I can grab the status code (eg 404 or 500).<\/p>\n
The .NET class doesn\u2019t include a property to capture how long the response took, at least not that I can discover. So instead I simply get the time, attempt the request, get the time again and calculate the difference. Close enough for my needs. FInally, the function writes a custom object to the pipeline using New-Object<\/a>.<\/p>\n
When the function is loaded you can run it like this:<\/p>\n
PS C:\\> test-website <\/font>http:\/\/jdhitsolutions.com\/blog<\/font><\/a><\/p>\n
ResponseMS : 253.0145
\n    
StatusCode : 200 <\/p>\n
Status     : OK <\/p>\n
URL        : <\/font>http:\/\/jdhitsolutions.com\/blog<\/font><\/a> <\/p>\n
DateTime   : 4\/7\/2010 11:04:30 AM<\/font><\/p>\n
With this in place, I then turned to the notification process. Windows PowerShell 2.0 includes a cmdlet, Send-MailMessage<\/a>, which can deliver an SMTP message. My script runs through a list of URLs, saves the objects to a variable, which I then parse out to build a message string. Each URL has its own message which is temporary stored in an array. Then the array is converted to a string and used as the message body for my email notification.<\/p>\n
#build message string for email<\/span>            
$data<\/span> |<\/span> foreach<\/span> {<\/span>            
    $m<\/span>=<\/span>(<\/span>"{0} {1} {2} ({3}) {4} milliseconds"<\/span> -f<\/span> `<\/p>\n
      $_<\/span>.<\/span>DateTime<\/span>,<\/span>$_<\/span>.<\/span>url<\/span>,<\/span>$_<\/span>.<\/span>status<\/span>,<\/span>$_<\/span>.<\/span>StatusCode<\/span>,<\/span>$_<\/span>.<\/span>ResponseMS<\/span>)<\/span>            \n    Write-Verbose<\/span> "Building message string"<\/span>             \n    Write-Verbose<\/span> $m<\/span>             \n    $msg<\/span>+=<\/span>$m<\/span>            \n}<\/span>            \n            \n#send mail response<\/span>            \nWrite-Verbose<\/span> "Sending mail message"<\/span>            \nSend-MailMessage<\/span> -To<\/span> $to<\/span> -From<\/span> $from<\/span> -Subject<\/span> $subject<\/span> `\n<\/span>-Body<\/span> $(<\/span>$msg<\/span> |<\/span>out-string<\/span>)<\/span> -SmtpServer<\/span> $smtpServer<\/span> -credential<\/span> $mailcred<\/span>            <\/pre>\n
Depending on your SMTP server configuration you may or may not need to specify a credential. Your SMTP server may also need some minor reconfiguration depending on your network.<\/p>\n
The last step was to simply create a scheduled task to run my PowerShell script:<\/p>\n
powershell.exe -noprofile -noninteractive -file c:\\scripts\\ScheduledWebCheck.ps1<\/p>\n
Now I get an hourly report that lets me know the web site status, which thankfully is almost always up.
\n  <\/p>\n
\n
Download Test-Web.ps1<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
As many of you know, one of the things I\u2019m doing these days is helping run The Experts Community web site. As such I need to make sure it is up and running. I also like to make sure my blog and a few other sites are responding to HTTP requests. 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