2atMonitoring

1.1.4041

2atMonitoring.psm1

#Requires -Version 4.0 -Modules 2atWeb,2atGeneral,2atSql

$PSDefaultParameterValues.Clear()
Set-StrictMode -Version 2.0

$ErrorActionPreference = 'Stop'

Add-Type -Assembly System.Web
Import-Module 2atGeneral
Import-Module 2atWeb
Import-Module 2atSql

Import-Module (Join-Path -Path $PSScriptRoot -ChildPath HtmlAgilityPack.dll)
[HtmlAgilityPack.HtmlNode]::ElementsFlags.Remove("form") | Out-Null

Function RelToAbs {
    Param(
        [Parameter(Mandatory=$true)]
        [ValidateScript({(New-Object System.Uri $_)})]
        [string]$BaseUrl,
        
        [Parameter(Mandatory=$true)]
        [string]$RelativeUrl,
        
        [switch]$NoHtmlDecode
    )
    if (! $NoHtmlDecode) { $RelativeUrl = [System.Web.HttpUtility]::HtmlDecode($RelativeUrl) }

    if ([System.Uri]::IsWellFormedUriString($RelativeUrl,[System.UriKind]::Absolute)) { return $RelativeUrl }
    
    if ([System.Uri]::IsWellFormedUriString($RelativeUrl,[System.UriKind]::Relative)) {
        $l = (New-Object System.Uri((New-Object System.Uri $BaseUrl), $RelativeUrl)).AbsoluteUri
        Write-Verbose "Absolute URL is $l"
        return $l
    }
    
    if ($NoHtmlDecode -and ([Uri]$RelativeUrl).IsAbsoluteUri) {
        Write-Warning "RelativeUrl is not correctly URL encoded '$RelativeUrl'. If this is a HTTP REDIRECT Location header, this is incorrect server behavior. Retrying with encoded URL."
        return ([Uri]$RelativeUrl).AbsoluteUri
    }    
    
    throw "RelativeUrl is not a valid (absolute or relative) url: '$RelativeUrl'"
}

Function Step {
    Param(
        [Parameter(Mandatory=$true)]
        [ValidateScript({(New-Object System.Uri $_)})]
        [string]$Url,

        [Parameter(Mandatory=$true)]
        [PSCustomObject]$Session,
        
        [string]$Method = 'GET',
        
        [ValidateScript({ $_ -is [HashTable] -or $_ -is [System.Collections.Generic.Dictionary[string,string]] })]
        [object]$FormData
    )
    
    $res = Get-WebResponse -Url $Url -Method $Method -FormData $FormData -HostIPs $Session.HostIPs -CookieContainer $Session.CookieContainer -Proxy $Session.Proxy -UserAgent 'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0; 2AT Monitoring; +http://2at.nl)' -Credentials $Session.Credentials
    
    if ($Session.History | ?{ $Url -eq $_.Url -and $Method -eq $_.Method -and $res.ResponseBody -eq $_.ResponseBody }) {
        $res.WebRequestStatus='LoopDetected'
        $res.WebRequestStatusDescription="The same URL was already visited on the same Step and received the same ResponseBody. ($Url)"
    }
    
    $Session.History += $res
    
    if ($res.WebRequestStatus -eq [System.Net.WebExceptionStatus]::Success) {
        if ($res.HTTPStatus -In (301, 302, 303, 307)) {
            $l = RelToAbs -BaseUrl $url -RelativeUrl $res.ResponseHeaders['Location'] -NoHtmlDecode
            Write-Verbose "REDIRECT ($($res.HTTPStatus)) -> $l"
            Step -Url $l -Session $Session
            return
        }
        
        if ($res.HTTPStatus -eq 200) {
            if ($res.ResponseBody.EndsWith('<noscript><p>Script is disabled. Click Submit to continue.</p><input type="submit" value="Submit" /></noscript></form><script language="javascript">window.setTimeout(''document.forms[0].submit()'', 0);</script></body></html>')) {
                Write-Verbose "ADFS auto POST"
                ProcessForm -Previous $res -Session $Session
                return
            }
            
            $u = (new-object System.Uri $res.Url).GetLeftPart([System.UriPartial]::Path)
            if ($Session.LoginSteps[$u]) {
                RunStep -Step $Session.LoginSteps[$u] -Previous $res -Session $Session
                return
            }
        }
    }
}

Function ProcessForm {
    Param(
        [HashTable]$FormData,

        [string]$FormId,

        [Parameter(Mandatory=$true)]
        [PSCustomObject]$Previous,
        
        [Parameter(Mandatory=$true)]
        [PSCustomObject]$Session
    )
    
    $htmldoc = New-Object HtmlAgilityPack.HtmlDocument
    $htmldoc.LoadHtml($Previous.ResponseBody)
    if ($FormId) {
        $form = $htmldoc.DocumentNode.SelectNodes("//form[@id='$FormId']")[0]
        if (!$form) { throw "No form with id='$FormId' found" }
    } else {
        $forms = $htmldoc.DocumentNode.SelectNodes('//form')
        if (!$forms) { throw 'No forms found' }
        if ($forms.Count -gt 1) {
            Write-Warning "Found $($forms.Count) forms but no FormId was specified, selecting the first"
        }
        $form=$forms[0]
    }
    $l = RelToAbs $Previous.Url $form.Attributes['action'].Value

    $b = New-Object 'System.Collections.Generic.Dictionary[string,string]'
    $form.SelectNodes('//input') | ?{ $_.Attributes['name'] -And $_.Attributes['value'] } | %{ 
        $b[$_.Attributes['name'].Value] = [System.Web.HttpUtility]::HtmlDecode($_.Attributes['value'].Value)
    }
    if ($FormData) { $FormData.Keys | %{ $b[$_]=$FormData[$_] } }
    
    Write-Verbose "FORM: $(($b.Keys | %{ $_ + '=' + $b[$_] } ) -join [Environment]::NewLine)"
    Step -Url $l -Method $form.Attributes['method'].Value -FormData $b -Session $Session
}

Function ProcessLink {
    Param(
        [Parameter(Mandatory=$true)]
        [string]$LinkText,

        [Parameter(Mandatory=$true)]
        [PSCustomObject]$Previous,
        
        [Parameter(Mandatory=$true)]
        [PSCustomObject]$Session,

        [Parameter(Mandatory=$false)]
        [string]$LinkType
    )
    
    $htmldoc = New-Object HtmlAgilityPack.HtmlDocument
    $htmldoc.LoadHtml($Previous.ResponseBody)
    if ($LinkType -eq 'IMG') {
        $links = $htmldoc.DocumentNode.SelectNodes('//img[@src]') | ? { $_ -and $_.Attributes['src'].Value.Contains($LinkText) } | % { $_.Attributes['src'].Value } | select -Unique
    } else {
        $links = $htmldoc.DocumentNode.SelectNodes('//a[@href]') | ? { $_ -and $_.InnerText.Trim() -eq $LinkText } | % { $_.Attributes['href'].Value } | select -Unique
    }

    $c = ($links | measure).Count
    if ($c -ne 1) { 
        Write-Warning "Found $c links matching '$LinkText', expected exactly one."
        $Previous.WebRequestStatus='LinkFailed'
        $Previous.WebRequestStatusDescription="Found $c links matching '$LinkText', expected exactly one."
        return
    }

    $l = RelToAbs $Previous.Url $links
    Write-Verbose "LINK: $l"
    
    Step -url $l -Session $Session
}

Function ProcessScript {
    Param(
        [Parameter(Mandatory=$true)]
        [string]$ScriptId,

        [Parameter(Mandatory=$true)]
        [string]$ScriptRegEx,

        [Parameter(Mandatory=$true)]
        [PSCustomObject]$Previous,
        
        [Parameter(Mandatory=$true)]
        [PSCustomObject]$Session
    )
    
    $htmldoc = New-Object HtmlAgilityPack.HtmlDocument
    $htmldoc.LoadHtml($Previous.ResponseBody)
    $s = $htmldoc.DocumentNode.SelectNodes('//script') | ?{ $_ -and $_.InnerText.Trim() -match [Regex]::Escape($ScriptId) }
    
    if (!$s) { throw "No script block matching '$ScriptId' found (using literal match)" }
    
    if ($s -is [HtmlAgilityPack.HtmlNodeCollection]) {
        Write-Warning 'Multiple matching script blocks found, using the first'
        $s = $s[0]
    }
    
    if (!($s.InnerText.Trim() -match $ScriptRegEx)) {
        throw "No url could be found: Script block doesn't match '$ScriptRegEx'"
    }
    
    if ($Matches['link']) {
        $l = RelToAbs $Previous.Url $Matches['link']
    } else {
        if ($Matches.Count -eq 1) {
            Write-Warning 'No match groups found, using full match as link to follow'
            $l = RelToAbs $Previous.Url $Matches[0]
        } else {
            if ($Matches.Count -gt 2) {
                Write-Warning 'Found multiple match groups, using first (create a named group ''link'' to specify witch group to use)'
            }
            $l = RelToAbs $Previous.Url $Matches[1]
        }
    }
    
    Step -url $l -Session $Session
}

Function ProcessSOAP {
    param(
        [Parameter(Mandatory=$true)]
        [string]$Url,

        [HashTable]$RequestData,

        [Parameter(Mandatory=$false)]
        [PSCustomObject]$Previous,
        
        [Parameter(Mandatory=$true)]
        [PSCustomObject]$Session
    )

        $Cred = New-Object System.Management.Automation.PSCredential ("$($session.Credentials.Domain)\$($session.Credentials.username)", (ConvertTo-SecureString $session.Credentials.Password -AsPlainText -Force) )

        $FormData = @{ 'SOAP' = $RequestData['Request']; 'SOAPAction' = $RequestData['SOAPAction'] }

        $res = Get-WebResponse -Url $url -Method 'POST' -Credentials $cred -FormData $FormData -Proxy $Session.Proxy -UserAgent 'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0; 2AT Monitoring; +http://2at.nl)'
   
        $session.History += $res

}

Function UpdateSession {
    Param(
        [Parameter(Mandatory=$true)]    
        [HashTable]$Step,
        
        [Parameter(Mandatory=$true)]    
        [PSCustomObject]$Session,
        
        [PSCustomObject]$TMGInfo,
        
        [Switch]$IsNewSession
    )
    Write-Debug "Updating $(if($IsNewSession) {'NEW'})session"
    
    if (!$IsNewSession -and ($Step['SqlConnection'] -or $Step['Name'])) { throw 'Specifying a SqlConnection or Name is only supported for new sessions' }

    if ($Step['Proxy']) { $Session.Proxy = New-Object System.Net.WebProxy $Step.Proxy    }
    if ($Step['LoginSteps']) { $Session.LoginSteps = $Step.LoginSteps }
    if ($Step['Servers']) { 
        if($TMGInfo){ SetSessionCookiesTmg -Session $Session -TMGInfo $TMGInfo -Servers $Step.Servers }
        if($Step['CookieName'] -and $Step['TargetServer'] -and $Step['CookieUrls']) { SetSessionCookie -Session $Session -TargetServer $Step.TargetServer -CookieName $Step.CookieName -Urls $Step.CookieUrls}
    }
    if ($Step['TargetServer']) { $Session.TargetServer = $Step.TargetServer }
    if ($Step['NextLogMinutes']) { $Session.NextLogMinutes = $Step.NextLogMinutes }
    if ($Step['HostIPs']) { $Session.HostIPs = $Step.HostIPs }
    if ($Step['Credentials']) {
        if ($Step.Credentials -is [PSCredential]) {
            $Session.Credentials = $Step.Credentials.GetNetworkCredential()
        } elseif ($Step.Credentials -is [System.Net.ICredentials]) {
            $Session.Credentials = $Step.Credentials
        } else {
            throw "Session credentials specified are of an unsupported type: $($Step.Credentials.GetType().FullName), please use either a PSCredential or a NetworkCredential"
        }
    }
    
    if ($IsNewSession) { $Session }
}

Function NewSession {
    Param(
             [Parameter(Mandatory=$true)]     
             [HashTable]$Step,
             
             [PSCustomObject]$TMGInfo
       )
       
       $Session = @{
            Id=-1
            Name=$Step['Name']
            HostIPs=@{}
            CookieContainer = New-Object System.Net.CookieContainer
            Proxy=$null
            SqlConnection=$Step['SqlConnection']
            WSConnection=$Step['WSConnection']
            ReportingConnection = $Step['ReportingConnection']
            LoginSteps=@{}
            Credentials=$null
            History=@()
            RequestNumber=1
            TargetServer=$null
            NextLogMinutes=10
       }      


    if ($Session.SqlConnection) {
        Write-Verbose "NEWSESSION: Connecting to SQL '$($Step.SqlConnection)'"
                
        Set-SqlData -ConnectionString $Session.SqlConnection -CommandText 'ops.LogJob' -Parameters @{ Job='HTTPMonitor'; Title='Job started' }
        $MonitorSession = Get-SqlData -ConnectionString $Session.SqlConnection -CommandText 'ops.SaveMonitorSession' -Parameters @{ Name=$Session.Name; Servers=($Step['Servers'] -Join ' / ') }
        $Session.Id = $MonitorSession.SessionId
    }

    if (!$Step['Servers']) { Write-Verbose 'NEWSESSION: New session created without cookies' }
    
    UpdateSession -Step $Step -Session ([PSCustomObject]$Session) -TMGInfo $TMGInfo -IsNewSession
}

Function SetSessionCookie{
    Param(
        [Parameter(Mandatory=$true)]
        [PSCustomObject]$Session,
        [Parameter(Mandatory=$true)]
        [string]$TargetServer,
        [Parameter(Mandatory=$true)]
        [string]$CookieName,
        [Parameter(Mandatory=$true)]
        [string[]]$Urls
    )
        foreach($url in $Urls) {
            $cookie = New-Object System.Net.Cookie $CookieName, $TargetServer
            $cookie.HttpOnly = $true        
            $Session.CookieContainer.Add($url, $cookie)
            Write-Verbose "Added cookie to session: $cookieName=$TargetServer $url"
        }
}

Function SetSessionCookiesTmg {
    Param(
        [Parameter(Mandatory=$true)]
        [PSCustomObject]$Session,

        [Parameter(Mandatory=$true)]
        [PSCustomObject]$TMGInfo,

        [Parameter(Mandatory=$true)]
        [string[]]$Servers
    )

    $TMGInfo.CookieIndex | %{
        $cookieName = $_.Cookie
        $Url = New-Object System.Uri $_.Url

        $rule = $TMGInfo.Rules[$cookieName.SubString(7)]

        if (! $rule) {
            Write-Warning "Unable to add cookie to session. No matching rule found for cookie '$cookieName' ($Url). Possible cause is an outdated TMGRuleGUIDs.xml file." 
            return
        }
        
        foreach($server in $Servers) {
            $entry = $rule.ServerFarm | ?{ $_.HostName -Match $server }
            if ($entry) { break }
        }
        if (! $entry) { 
            Write-Warning "Unable to add cookie to session. No matching server found for rule '$($rule.Name)' ($Url)"
            return
        }
        
        $cookie = New-Object System.Net.Cookie $cookieName, $entry.GUID, '/', $Url.Host
        $cookie.HttpOnly = $true
        
        $Session.CookieContainer.Add($Url, $cookie)

        Write-Verbose "Added cookie to session: $cookieName=$($entry.GUID) ($Url)"
    }
}

Function GetServer {
    Param
    (
        [Parameter(Mandatory=$true)]
        [PSCustomObject]$WebResponse
    )

    if ($WebResponse.ResponseHeaders['X-WFE']) { $WebResponse.ResponseHeaders['X-WFE'] } else { $WebResponse.ResponseHeaders['X-Powered-by-server'] }
}

Function ValidateResponse {
    Param(
        [Parameter(Mandatory=$true)]
        [PSCustomObject]$Response,
        
        [Parameter(Mandatory=$true)]
        [PSCustomObject]$Validate
    )
    #TODO: Transform $Response.WebRequestStatusDescription to hashtable (or xml)

    if ($Response.WebRequestStatus -ne [System.Net.WebExceptionStatus]::Success) { 
        Write-Verbose "Skipped validation because request already marked as failed ($($Response.WebRequestStatus)"
        return
    }
    
    if ($Validate['Url']) {
        if ($Response.Url.TrimEnd('/') -ne $Validate.Url.TrimEnd('/')) {
            $Response.WebRequestStatus='UrlValidationFailed'
            $Response.WebRequestStatusDescription="Url validation failed, found '$($Response.Url)', expected '$($Validate.Url)'"
            Write-Warning $Response.WebRequestStatusDescription
            return
        } else {
            Write-Verbose 'Url validation succeeded'
        }
    }
    if ($Validate['ContentMatch']) {
        if (! ($Response.ResponseBody -match $Validate.ContentMatch)) {
            $Response.WebRequestStatus='ContentValidationFailed'
            $Response.WebRequestStatusDescription="Content validation failed, page '$($Response.Url)' does not match '$($Validate.ContentMatch)'"
            Write-Warning $Response.WebRequestStatusDescription
            return
        } else {
            Write-Verbose "Content validation succeeded '$($Validate.ContentMatch)'"
        }
    }
    if ($Validate['Time']) {
        if (! ([int]$Response.TimeToFirstByte.TotalMilliseconds -le [int]$Validate.Time)) {
            $Response.WebRequestStatus='TimeValidationFailed'
            $Response.WebRequestStatusDescription="Time exceeded, page took $([int]$Response.TimeToFirstByte.TotalMilliseconds)ms, maximum was set at $([int]$Validate.Time)ms ($($Response.Url))"
            Write-Warning $Response.WebRequestStatusDescription
            return
        } else {
            Write-Verbose "Time validation succeeded ($([int]$Response.TimeToFirstByte.TotalMilliseconds)ms < $([int]$Validate.Time)ms)"
        }
    }
    if ($Validate['TargetServer']) {
        $ResponseServer = GetServer -WebResponse $Response
        if ($Validate.TargetServer -ne $ResponseServer) {
            $Response.WebRequestStatus='TargetServerValidationFailed'
            $Response.WebRequestStatusDescription="Response received from other than TargetServer. TargetServer = '$($Validate.TargetServer)'. ResponseServer = '$ResponseServer'."
            Write-Warning $Response.WebRequestStatusDescription
            return
        } else {
            Write-Verbose "TargetServer validation succeeded. TargetServer = ResponseServer = '$ResponseServer'."
        }
    }
    if ($Validate['ResponseHeader']) {
        if ( $response.ResponseHeaders[$Validate.ResponseHeader] -ne $Validate.HeaderMatch) {
            $Response.WebRequestStatus='ResponseHeaderValidationFailed'
            $Response.WebRequestStatusDescription="Response header is different than expected value ($($response.ResponseHeaders[$Validate.ResponseHeader]), expected $($Validate.HeaderMatch))"
            Write-Warning $Response.WebRequestStatusDescription
            return
        } else {
            Write-Verbose "Response header validation succeeded. Header has expected value ($($Validate.HeaderMatch))"
        }
    }
}

Function PostEntityUpdate {
    Param
    (
        [Parameter(Mandatory=$true)]
        [PSCustomObject]$Session,

        [string]$Monitor
    )
    
    $lr = $Session.History[$Session.History.Length-1]

    $FormData = @{
        name = "$Monitor-$($Session.TargetServer)";
        webRequestStatus = $lr.WebRequestStatus;
        nextLogTime = $lr.DateTime.AddMinutes($Session.NextLogMinutes).ToUniversalTime().ToString('u');
        logTime = $lr.DateTime.ToUniversalTime().ToString('u');
    }

    if ($lr.WebRequestStatus -ne 'Success') {
        $information =  @{
            WebRequestStatusDescription = $lr.WebRequestStatusDescription
        }

        $FormData.information = New-Object PSObject -Property $information | ConvertTo-Xml -NoTypeInformation -as String
    }

    try {
        Write-Verbose "Posting to $($Session.WSConnection)"
        Invoke-RestMethod -Uri $Session.WSConnection -Method 'POST' -Body $FormData -TimeoutSec 5                         
    } catch {
        #TODO This should become Write-Error once the new monitoring becomes permanent
        Write-Warning "Entity endpoint unavailable $($_.Exception.Message)"                      
    }
}

Function PostEntityReportData {
    Param
    (
        [Parameter(Mandatory=$true)]
        [ValidateScript({(New-Object System.Uri $_)})]
        [string]$entityReportingUrl,
        
        [Parameter(Mandatory=$true)]     
        [string]$entityName,

        [Parameter(Mandatory=$false)]         
        [datetime]$logTime,

        [Parameter(Mandatory=$true)]
        [string]$propertyName,

        [Parameter(Mandatory=$true)]
        [int]$propertyValue
    )
        

    $FormData = @{ 
        Name = $entityName;
        LogTime = $logTime.ToUniversalTime().ToString('u');
        PropertyName = $propertyName;
        PropertyValue = $propertyValue;
    }

    try {
        Write-Verbose "Posting reportingData to $entityReportingUrl"
        Invoke-RestMethod -Uri $entityReportingUrl -Method 'POST' -Body $FormData -TimeoutSec 5
    } catch {
        #TODO This may need to become Write-Error once the new monitoring becomes permanent
        Write-Warning "Entity reporting endpoint unavailable $($_.Exception.Message)"                      
    }
}

Function LogSteps {
       Param(
             [Parameter(Mandatory=$true)]
             [PSCustomObject]$Session,
             
             [int]
             $StepNumber,
             
             [string]$Monitor,
             
             [switch]
             $PassThru
       )
       
       $i=1
       foreach($WebResponse in $Session.History) {
             $u = New-Object System.Uri $WebResponse.Url
             $hostname = "$($u.Host)"
             if ($u.Port -ne 80) { $hostname+=":$($u.Port)"}
             if ($u.Query.Length -ne 0) { $query=$u.Query.Substring(1) } else { $query='' } 

             $p = @{
                    LogDateTime=$WebResponse.DateTime
                    Host=$hostname
                    UriStem=$u.AbsolutePath
                    UriQuery=$query
                    Method=$WebResponse.Method
                    HTTPStatus=[int]$WebResponse.HTTPStatus
                     TimeTaken=[int]$WebResponse.TimeToFirstByte.TotalMilliseconds
                    RequestStatus=[string]$WebResponse.WebRequestStatus
                     RequestStatusDescription=$WebResponse.WebRequestStatusDescription
                    Url=$WebResponse.Url
                    SessionId=$Session.Id
                    Monitor=$Monitor
                    TargetServer=$Session.TargetServer
                    NextLogMinutes=$Session.NextLogMinutes
                    StepNumber=$StepNumber
                    RequestNumber=$Session.RequestNumber++
                    IsStepResult=($i -eq $Session.History.Count)
             }

             if ($WebResponse.FormData) {
                    $p.FormData=(($WebResponse.FormData.Keys | %{ $_ + '=' + $WebResponse.FormData[$_] } ) -join [Environment]::NewLine)
             }
             
             if ($WebResponse.ResponseHeaders) {
                    $p.Server=GetServer -WebResponse $WebResponse
                    
                    $p.XSharePointHealthScore=$WebResponse.ResponseHeaders['X-SharePointHealthScore']
                  $p.SPIisLatency=$WebResponse.ResponseHeaders['SPIisLatency']
             $p.SPRequestDuration=$WebResponse.ResponseHeaders['SPRequestDuration']
                    $p.RequestGuid=$WebResponse.ResponseHeaders['request-id']
                    $p.RawResponse=Get-WebResponseString -WebResponse $WebResponse
             }
             
             Write-Debug "Writing data"
             if ($Session.SqlConnection) {
            Write-Verbose "Writing data to the database"
                    Set-SqlData -ConnectionString $Session.SqlConnection -CommandText 'ops.SaveMonitorResult' -Parameters $p
             }
            

            if (!$Session.SqlConnection -And !$Session.WSConnection) {
                        if ($p.HTTPStatus) {
                            Write-Host "$(Get-Date) $($p.Server) ($($p.XSharePointHealthScore)) $($p.HTTPStatus) $($p.Method) $($u.GetLeftPart([System.UriPartial]::Path))"
                        } else {
                            Write-Host "$(Get-Date) $($p.RequestStatus) $($u.GetLeftPart([System.UriPartial]::Path))"
                        }
            }

            if ($PassThru) { $WebResponse }
            $i++
       }
       
       if ($Session.WSConnection) {
            Write-Verbose "Posting data to the entity endpoint"

            PostEntityUpdate -Session $Session -Monitor $Monitor
        }
    
    if ($Session.ReportingConnection) {
        Write-Verbose "Posting data to the reporting endpoint"
        $lastIndex = $Session.History.Length-1
        if($Session.History[$lastIndex].WebRequestStatus -eq "Success"){
            $logTime = $Session.History[$lastIndex].DateTime
            $propertyName="Response time"
            $propertyValue=[int]$Session.History[$lastIndex].TimeToFirstByte.TotalMilliseconds

            PostEntityReportData -entityReportingUrl $Session.ReportingConnection -entityName "$Monitor-$($Session.TargetServer)" -logTime $LogTime -propertyName $propertyName -propertyValue $propertyValue
        }
    }
}

Function RunStep {
    Param(
        [Parameter(Mandatory=$true)]
        [HashTable]$Step,
        
        [PSCustomObject]$Previous,
        
        [Parameter(Mandatory=$true)]
        [PSCustomObject]$Session
    )
        
    switch ($Step.Action)
    {
        'Url' {
            Write-Debug "URL: $($Step.Url)"
            Step -Url $Step.Url -Session $Session
        }
        'Link' {
            Write-Debug "LINK: $($Step.LinkText)"
            ProcessLink -LinkText $Step.LinkText -Previous $Previous -Session $Session -LinkType $Step['LinkType']
        }
        'Form' {
            Write-Debug "FORM"
            ProcessForm -FormId $Step['FormId'] -FormData $Step['FormData'] -Previous $Previous -Session $Session
        }
        'Script' {
            Write-Debug 'SCRIPT'
            ProcessScript -ScriptId $Step['ScriptId'] -ScriptRegEx $Step['ScriptRegEx'] -Previous $Previous -Session $Session
        }
        'SOAP' {
            Write-Debug 'SOAP'
            ProcessSOAP -RequestData $Step['RequestData'] -Url $Step['Url'] -Previous $Previous -Session $Session
        }
        default {
            throw "Unrecognized step $($CurrentStep.Action)"
        }
    }
    
    if ($Step['Validate']) {
        ValidateResponse -Response $Session.History[$Session.History.Length-1] -Validate $Step.Validate
    }
}

Function Invoke-Monitoring {
    Param(
        [Parameter(Mandatory=$true)]
        [System.Array]$Steps,

        [PSCustomObject]$TMGInfo
    )
    Get-CallerPreference -Cmdlet $PSCmdlet -SessionState $ExecutionContext.SessionState
    
    $i=0
    foreach($CurrentStep in $Steps) {
        switch ($CurrentStep.Action) {
            'NewSession' {
                Write-Progress -Activity 'Initializing session' -PercentComplete (100*$i/$Steps.Count)
                Write-Debug 'NEWSESSION'
                
                $Session = NewSession -Step $CurrentStep -TMGInfo $TMGInfo                                
                $Previous = $null
            }
            'UpdateSession' {
                Write-Progress -Activity 'Updating session' -PercentComplete (100*$i/$Steps.Count)
                Write-Debug 'UPDATESESSION'

                UpdateSession -Step $CurrentStep -TMGInfo $TMGInfo -Session $Session
            }
            default {
                Write-Progress -Activity 'Retrieving webpage' -CurrentOperation $CurrentStep.Url -PercentComplete (100*$i/$Steps.Count)

                RunStep -Step $CurrentStep -Previous $Previous -Session $Session
                LogSteps -Session $Session -StepNumber ($i+1) -Monitor $CurrentStep['Monitor'] -PassThru
                $Previous = $Session.History | Select-Object -Last 1
                $Session.History=@()
            }
        }
        
        $i++
    }
}

Export-ModuleMember -Function Invoke-*

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