Moving specific settings from a Production to System Default Settings |

Article

Theo Stolker · Jun 4 2m read

#Interoperability #Tools #InterSystems IRIS #InterSystems IRIS for Health #Health Connect

When developing a new Interoperability Production, it is quite natural that settings are initially added in the Production.

However, as soon as you want to move the Production from development to a test or staging environment, it becomes clear that some settings like HTTP Servers, IP addresses and/or ports need to be changed. In order to avoid these settings being overwritten during a redeployment later on, it is essential that you move these settings from the Production to the System Default settings.

Creating System Default settings manually is possible, but will become hard when you have lots of Business Components in your production. Therefore, @Wietze Drost asked me to develop a tool that automates this process by allowing to specify which settings have to be created as System Default Settings using a filter expression. This expression can be defined like ":HTTPServer,SSLConfig", where "*" means "for any the Host Class Name". After the colon this is followed by a list of settings to be moved. So this expression means "create or update System Default Settings for all settings named "HTTPServer" and "SSLConfig". You can define multiple filter expressions separated by a semicolon, e.g. "*:HTTPServer,SSLConfig;FullClassName2:xxx,yyy"

Based on his request I wrote the Class Method named GetSettingsFromProduction, which does exactly that:

ClassMethod GetSettingsFromProduction(production As %String, filter As %String = "", removeFromProduction As %Boolean = 0, updateSettings As %Boolean = 1) As %Status

production - The name of the production, if left empty the name of the currently running production will be used
filter - A filter to select settings, like "*:HTTPServer,SSLConfig". You can add multiple filters separated by ";", and it is allowed to use specific class names. If filter is left empty, all settings will be processed.
removeFromProduction - If set to 1, the settings selected by the filter will be removed from the production.
updateSettings - If set to 0, the settings will not be updated in the System Default Settings.

When run, information about the actions taken will be written to the terminal.

The complete class file has been pasted in a comment on this article.

Your questions and feedback are appreciated!

Theo Stolker · Jun 4

Include EnsConstants

/// Get Settings from Production and Create DefaultSettings
Class CONNECTORSPKG.Utility.DefaultSettings
{

/// List productions
ClassMethod ListProductions(print As %Boolean = 1, namespace As %String = {$NAMESPACE}) As %String
{
    new $NAMESPACE
    set $NAMESPACE = namespace
    set production = ""

    if print
    {
        write "Productions in namespace " _ namespace _ ":",!
    }

    set prdRS = ##class(%ResultSet).%New("Ens.Config.Production:ProductionStatus")
    do prdRS.Execute()

    while (prdRS.Next())
    {
        set status = prdRS.Data("Status")

        if status = "Running"
        {
            set production = prdRS.Data("Production")
        }

        if print
        {
            write prdRS.Data("Production")," (",status,")",!
        }
    }

    return production
}

/// Export to settingsfile
ClassMethod Export() As %Status
{
    return ##class(Ens.Config.DefaultSettings).%Export("/home/irisowner/systemdefaults/Ens.Config.DefaultSettings.esd", "MONDRIAAN.FoundationProduction")
}

/// Export from settingsfile
ClassMethod Import() As %Status
{
    set sc = ##class(Ens.Config.DefaultSettings).%Import("/home/irisowner/systemdefaults/Ens.Config.DefaultSettings.esd", .count, .idsimported)

    write "Imported ",count," settings",!

    return sc
}

/// Connectors action
ClassMethod SettingsFromProduction(removeFromProduction As %Boolean = 0, updateSettings As %Boolean = 1) As %Status
{
    return ..GetSettingsFromProduction("CONNECTORSPKG.FoundationProduction", "*:HTTPServer,SSLConfig;CONNECTORSPKG.BO.GenericHTTP.Operation:HttpMethod,AcceptHeader,ContentType,URL,AuthorizationType,Credentials,CustomAuthorizationHeader,AlertOnError,ReplyCodeActions", removeFromProduction, updateSettings)
}

/// Get settings From Production
ClassMethod GetSettingsFromProduction(production As %String = {..ListProductions(0, $NAMESPACE)}, filter As %String = "", removeFromProduction As %Boolean = 0, updateSettings As %Boolean = 1) As %Status
{
    write "Settings in production '",production _ "':",!
    set xdataId = production _ "||ProductionDefinition"
    set xdata = ##class(%Dictionary.XDataDefinition).%OpenId(xdataId, , .sc)

    if $$$ISERR(sc)
    {
        write "Failed to open XData block '" _ xdataId,"': ",$SYSTEM.Status.GetErrorText(sc),!
        return sc
    }

    set tProduction = ##class(Ens.Config.Production).%OpenId(production,,.sc)

    if $$$ISERR(sc)
    {
        write "Failed to open production '",production,"': ",$SYSTEM.Status.GetErrorText(sc),"; settings will not be removed from the production",!
        set removeFromProduction = 0
    }

    set sc = ##class(%XML.TextReader).ParseStream(xdata.Data, .textreader)
    #dim textreader as %XML.TextReader

    if $$$ISERR(sc)
    {
        write "Failed to parse XData block '" _xdataId,"': ",$SYSTEM.Status.GetErrorText(sc),!
        return sc
    }

    set currentItemName = ""
    set currentItemClass = ""
    #dim tRemovedItemCount as %Integer = 0
    while textreader.Read()
    {
        if (textreader.NodeType '= "element")
        {
            continue
        }

        if (textreader.LocalName = "Item")
        {
            if (textreader.MoveToAttributeName("Name"))
            {
                set currentItemName = textreader.Value
            }

            if (textreader.MoveToAttributeName("ClassName"))
            {
                set currentItemClass = textreader.Value
            }
            #; write "Found Item with Name='" _ currentItemName _ "' of class '" _ currentItemClass _ "':",!
            continue
        }

        if (textreader.LocalName = "Setting")
        {
            do ..HandleXDataSetting(textreader, tProduction, currentItemName, currentItemClass, filter, removeFromProduction, updateSettings, .tRemovedItemCount)
        }
    }

    if tRemovedItemCount > 0
    {
        write "Removed ",tRemovedItemCount," settings; now saving Production '",production,"':"
        return ..SaveProduction(tProduction)
    }

    return $$$OK
}

/// Hanlde setting found in the XData 
ClassMethod HandleXDataSetting(textreader As %XML.TextReader, tProduction As Ens.Config.Production, currentItemName As %String, currentItemClass As %String, filter As %String, removeFromProduction As %Boolean, updateSettings As %Boolean, ByRef tRemovedItemCount As %Integer)
{
    if (textreader.MoveToAttributeName("Target"))
    {
        set target = textreader.Value
    }
    if (textreader.MoveToAttributeName("Name"))
    {
        set name = textreader.Value
    }

    do textreader.Read() // Read value
    set value = textreader.Value

    #; write "Found Setting Target=",target,", name=",name,", Value=",value,!
    if ..InFilter(filter, currentItemName, currentItemClass, target, name, value)
    {
        if updateSettings && $$$ISERR(..HandleSetting(tProduction.Name, currentItemName, currentItemClass, target, name, value))
        {
            return
        }

        if removeFromProduction && ..RemoveSettingFromProduction(tProduction, currentItemName, target, name)
        {
            set tRemovedItemCount = tRemovedItemCount + 1
        }
    }
}

/// SaveProduction
ClassMethod SaveProduction(tProduction As Ens.Config.Production) As %Status
{
    // Save the changes we made to the production
    set sc = tProduction.%Save(1)

    if $$$ISERR(sc)
    {
        write " failed: ",$SYSTEM.Status.GetErrorText(sc),!
        return sc
    }
    write !

    // Regenerate the XData in the corresponding class
    write "Save Production XData: "
    Set sc = tProduction.SaveToClass()

    if $$$ISERR(sc)
    {
        write " failed: ",$SYSTEM.Status.GetErrorText(sc),!
        return sc
    }
    write !

    // Grab the state of the production
    set sc = ##class(Ens.Director).GetProductionStatus(.tRunningProduction, .tState)

    if $$$ISERR(sc)
    {
        write "Failed to get Production status: ",$SYSTEM.Status.GetErrorText(sc),!
        return sc
    }

    // Finally, does the production need updating?
    if (tRunningProduction = tProduction.Name) && (tState = $$$eProductionStateRunning)
    {
        // Update the running production with the new settings
        write "Update running production: "
        set sc = ##class(Ens.Director).UpdateProduction(##class(Ens.Director).GetRunningProductionUpdateTimeout())

        if $$$ISERR(sc)
        {
            write " failed: ",$SYSTEM.Status.GetErrorText(sc),!
            return sc
        }
    }

    return $$$OK
}

/// Determine if the setting is in the Filter 
ClassMethod InFilter(filter As %String, itemName As %String, class As %String, target As %String, varName As %String, value As %String) As %Boolean
{
    if filter = ""
    {
        return 1
    }

    for classIndex = 1:1:$LENGTH(filter, ";")
    {
        set classPart = $PIECE(filter, ";", classIndex)
        set configClass = $PIECE(classPart, ":", 1)

        if (configClass '= "*") && (configClass '= class)
        {
            continue
        }

        set vars = $PIECE(classPart, ":", 2)

        for varIndex = 1:1:$LENGTH(vars, ",")
        {
            if $PIECE(vars, ",", varIndex) = varName
            {
                return 1
            }
        }
    }

    return 0
}

/// Handle Setting
ClassMethod HandleSetting(production As %String, item As %String, class As %String, target As %String, varName As %String, value As %String) As %Status
{
    if ##class(Ens.Config.DefaultSettings).IdKeyExists(production, item, class, varName, .id)
    {
        set defaultSetting = ##class(Ens.Config.DefaultSettings).%OpenId(id, , .sc)

        if $$$ISERR(sc)
        {
            write "Failed to get default setting named '",item,":",varName,"': ",$SYSTEM.Status.GetErrorText(sc),!
            return sc
        }

        if defaultSetting.SettingValue = value
        {            
            write "Skipping '",item,":",varName,"' as it already exists with the same value",!
            return $$$OK
        }

        write "Updating '",item,":",varName,"' from '",defaultSetting.SettingValue,"' to '",value,"'",!
    }
    else
    {
        set defaultSetting = ##class(Ens.Config.DefaultSettings).%New()
        set defaultSetting.ProductionName = production
        set defaultSetting.ItemName = item
        set defaultSetting.HostClassName = class
        set defaultSetting.SettingName = varName
        set defaultSetting.Deployable = 1

        write "Creating '",item,":",varName,"' from '",defaultSetting.SettingValue,"' with value '",value,"'",!
    }

    set defaultSetting.SettingValue = value

    set sc =  defaultSetting.%Save()

    if $$$ISERR(sc)
    {
        write "Failed setting default setting named '",item,":",varName,"' to '",value,"': ",$SYSTEM.Status.GetErrorText(sc),!
    }

    return sc
}

/// Rmove Setting from production
ClassMethod RemoveSettingFromProduction(tProduction As Ens.Config.Production, item As %String, target As %String, varName As %String) As %Boolean
{
    #dim tItemObj as Ens.Config.Item = tProduction.FindItemByConfigName(item, .sc, 1)

    if '$IsObject(tItemObj)
    {
        write "Failed to get item '",item,"': ",$SYSTEM.Status.GetErrorText(sc),!
        return 0
    }

    for i = 1:1:tItemObj.Settings.Count()
    {
        #dim tSetting As Ens.Config.Setting = tItemObj.Settings.GetAt(i)

        if (tSetting.Name = varName) && (tSetting.Target = target)
        {
            do tItemObj.Settings.RemoveAt(i, .success)
            return success
        }
    }

    return 0
}

}

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