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'<begin script sample>


'This script provides high availability for IIS websites
'By default, it monitors the "Default Web Site" and "DefaultAppPool"
'To monitor another web site, change the SITE_NAME below
'To monitor another application pool, change the APP_POOL_NAME below
'More thorough and application-specific health monitoring logic can be added to the script if needed

Option Explicit

DIM SITE_NAME
DIM APP_POOL_NAME
Dim START_WEB_SITE
Dim START_APP_POOL
Dim SITES_SECTION_NAME
Dim APPLICATION_POOLS_SECTION_NAME
Dim CONFIG_APPHOST_ROOT
Dim STOP_WEB_SITE


'Note:
'Replace this with the site and application pool you want to configure high availability for
'Make sure that the same web site and application pool in the script exist on all cluster nodes. Note that the names are case-sensitive.
SITE_NAME = "Default Web Site"
APP_POOL_NAME = "DefaultAppPool"

START_WEB_SITE = 0
START_APP_POOL = 0
STOP_WEB_SITE  = 1
SITES_SECTION_NAME = "system.applicationHost/sites"
APPLICATION_POOLS_SECTION_NAME = "system.applicationHost/applicationPools"
CONFIG_APPHOST_ROOT = "MACHINE/WEBROOT/APPHOST"

'Helper script functions


'Find the index of the website on this node
Function FindSiteIndex(collection, siteName)

    Dim i

    FindSiteIndex = -1    

    For i = 0 To (CInt(collection.Count) - 1)
        If collection.Item(i).GetPropertyByName("name").Value = siteName Then
            FindSiteIndex = i
            Exit For
        End If		 
    Next

End Function


'Find the index of the application pool on this node
Function FindAppPoolIndex(collection, appPoolName)

    Dim i

    FindAppPoolIndex = -1    

    For i = 0 To (CInt(collection.Count) - 1)
        If collection.Item(i).GetPropertyByName("name").Value = appPoolName Then
            FindAppPoolIndex = i
            Exit For
        End If		 
    Next

End Function

'Get the state of the website
Function GetWebSiteState(adminManager, siteName)

    Dim sitesSection, sitesSectionCollection, siteSection, index, siteMethods, startMethod, executeMethod
    Set sitesSection = adminManager.GetAdminSection(SITES_SECTION_NAME, CONFIG_APPHOST_ROOT)
    Set sitesSectionCollection = sitesSection.Collection

    index = FindSiteIndex(sitesSectionCollection, siteName)
    If index = -1 Then
        GetWebSiteState = -1
    End If	    

    Set siteSection = sitesSectionCollection(index)

    GetWebSiteState = siteSection.GetPropertyByName("state").Value

End Function

'Get the state of the ApplicationPool
Function GetAppPoolState(adminManager, appPool)

    Dim configSection, index, appPoolState

    set configSection = adminManager.GetAdminSection(APPLICATION_POOLS_SECTION_NAME, CONFIG_APPHOST_ROOT)
    index = FindAppPoolIndex(configSection.Collection, appPool)

    If index = -1 Then
        GetAppPoolState = -1
    End If	    

    GetAppPoolState = configSection.Collection.Item(index).GetPropertyByName("state").Value
End Function


'Start the w3svc service on this node
Function StartW3SVC()

    Dim objWmiProvider
    Dim objService
    Dim strServiceState
    Dim response

    'Check to see if the service is running
    set objWmiProvider = GetObject("winmgmts:/root/cimv2")
    set objService = objWmiProvider.get("win32_service='w3svc'")
    strServiceState = objService.state

    If ucase(strServiceState) = "RUNNING" Then
        StartW3SVC = True
    Else
        'If the service is not running, try to start it
        response = objService.StartService()

        'response = 0  or 10 indicates that the request to start was accepted
        If ( response <> 0 ) and ( response <> 10 ) Then
            StartW3SVC = False
        Else
            StartW3SVC = True
        End If
    End If
    
End Function


'Start the application pool for the website
Function StartAppPool()

    Dim ahwriter, appPoolsSection, appPoolsCollection, index, appPool, appPoolMethods, startMethod, callStartMethod
    Set ahwriter = CreateObject("Microsoft.ApplicationHost.WritableAdminManager")

    Set appPoolsSection = ahwriter.GetAdminSection(APPLICATION_POOLS_SECTION_NAME, CONFIG_APPHOST_ROOT)       
    Set appPoolsCollection = appPoolsSection.Collection

    index = FindAppPoolIndex(appPoolsCollection, APP_POOL_NAME)
    Set appPool = appPoolsCollection.Item(index)
    
    'See if it is already started
    If appPool.GetPropertyByName("state").Value = 1 Then
        StartAppPool = True
        Exit Function
    End If

    'Try To start the application pool
    Set appPoolMethods = appPool.Methods
    Set startMethod = appPoolMethods.Item(START_APP_POOL)
    Set callStartMethod = startMethod.CreateInstance()
    callStartMethod.Execute()
    
    'If started return true, otherwise return false
    If appPool.GetPropertyByName("state").Value = 1 Then
        StartAppPool = True
    Else
        StartAppPool = False
    End If

End Function


'Start the website
Function StartWebSite()

    Dim ahwriter, sitesSection, sitesSectionCollection, siteSection, index, siteMethods, startMethod, executeMethod
    Set ahwriter = CreateObject("Microsoft.ApplicationHost.WritableAdminManager")
    Set sitesSection = ahwriter.GetAdminSection(SITES_SECTION_NAME, CONFIG_APPHOST_ROOT)
    Set sitesSectionCollection = sitesSection.Collection

    index = FindSiteIndex(sitesSectionCollection, SITE_NAME)
    Set siteSection = sitesSectionCollection(index)

    if siteSection.GetPropertyByName("state").Value = 1 Then
        'Site is already started
        StartWebSite = True
        Exit Function
    End If

    'Try to start site
    Set siteMethods = siteSection.Methods
    Set startMethod = siteMethods.Item(START_WEB_SITE)
    Set executeMethod = startMethod.CreateInstance()
    executeMethod.Execute()

    'Check to see if the site started, if not return false
    If siteSection.GetPropertyByName("state").Value = 1 Then
        StartWebSite = True
    Else
        StartWebSite = False
    End If

End Function


'Stop the website
Function StopWebSite()

    Dim ahwriter, sitesSection, sitesSectionCollection, siteSection, index, siteMethods, startMethod, executeMethod, autoStartProperty
    Set ahwriter = CreateObject("Microsoft.ApplicationHost.WritableAdminManager")
    Set sitesSection = ahwriter.GetAdminSection(SITES_SECTION_NAME, CONFIG_APPHOST_ROOT)
    Set sitesSectionCollection = sitesSection.Collection

    index = FindSiteIndex(sitesSectionCollection, SITE_NAME)
    Set siteSection = sitesSectionCollection(index)

    'Stop the site
    Set siteMethods = siteSection.Methods
    Set startMethod = siteMethods.Item(STOP_WEB_SITE)
    Set executeMethod = startMethod.CreateInstance()
    executeMethod.Execute()

End Function



'Cluster resource entry points. More details here:
'http://msdn.microsoft.com/en-us/library/aa372846(VS.85).aspx

'Cluster resource Online entry point
'Make sure the website and the application pool are started
Function Online( )

    Dim bOnline
    'Make sure w3svc is started
    bOnline = StartW3SVC()

    If bOnline <> True Then
        Resource.LogInformation "The resource failed to come online because w3svc could not be started."
        Online = False
        Exit Function
    End If


    'Make sure the application pool is started
    bOnline = StartAppPool()
    If bOnline <> True Then
        Resource.LogInformation "The resource failed to come online because the application pool could not be started."
        Online = False
        Exit Function
    End If


    'Make sure the website is started
    bOnline = StartWebSite()
    If bOnline <> True Then
        Resource.LogInformation "The resource failed to come online because the web site could not be started."
        Online = False
        Exit Function
    End If

    Online = true 

End Function

 
'Cluster resource offline entry point
'Stop the website
Function Offline( )

    StopWebSite()
    Offline = true

End Function


'Cluster resource LooksAlive entry point
'Check for the health of the website and the application pool
Function LooksAlive( )

    Dim adminManager, appPoolState, configSection, i, appPoolName, appPool, index

    i = 0
    Set adminManager  = CreateObject("Microsoft.ApplicationHost.AdminManager")
    appPoolState = -1

    'Get the state of the website
    if GetWebSiteState(adminManager, SITE_NAME) <> 1 Then
        Resource.LogInformation "The resource failed because the " & SITE_NAME & " web site is not started."
        LooksAlive = false
        Exit Function
    End If


    'Get the state of the Application Pool
     if GetAppPoolState(adminManager, APP_POOL_NAME) <> 1 Then
         Resource.LogInformation "The resource failed because Application Pool " & APP_POOL_NAME & " is not started."
         LooksAlive = false  
	 Exit Function
     end if

     '  Web site and Application Pool state are valid return true
     LooksAlive = true
End Function


'Cluster resource IsAlive entry point
'Do the same health checks as LooksAlive
'If a more thorough than what we do in LooksAlive is required, this should be performed here
Function IsAlive()   

    IsAlive = LooksAlive

End Function


'Cluster resource Open entry point
Function Open()

    Open = true

End Function


'Cluster resource Close entry point
Function Close()

    Close = true

End Function


'Cluster resource Terminate entry point
Function Terminate()

    Terminate = true

End Function
'<end script sample>