Call grails plugin closure from Groovy class - grails

Question

I am using the AWS plugin for grails. I am trying to use the sesMail closure from a Groovy class, not a service or controller e.g. in a method:
String msgId = sesMail {
from props.from
replyTo props.replyTo
to prop.to
html props.body
}
I am getting an error saying sesMail is not a method of the Groovy class. My questions are:
How can I call a plugin closure that is ordinarily available in grails service and controllers from a regular Groovy class
Following that I'm curious how these closures are defined and made available in the service and controller. I can't find a definition of sesMail in the plugin.
thanks

Answer 1

Good Question. And I appreciate that you are curious to find the root cause of your problem. Here are your answers:-
You can directly call the SendSesMail bean to send mail instead of calling the sesMail closure. Your groovy class would look like:
class MyGroovyClass{
def sendSesMail
def sendSomeMails(){
String msgId = sendSesMail.send{
from props.from
replyTo props.replyTo
to prop.to
html props.body
}
}
}
As you can see SendSesMail is not a service class it is just a POGO, so it will not be autowired in this groovy class unless you define that in resources.groovy. So:
Something like:
//resources.groovy
beans = {
sendSesMail(grails.plugin.aws.ses.SendSesMail)
}
Also keep a note by using the above method directly you would be bypassing grails.plugin.aws.ses.enabled configuration. So you have to handle it explicitly.
You can very well find the definition of sesMail method which is metaClasses over target classes to take a Closure as an argument here in MetaClassInjector. This class is basically used to inject/add dynamicMethods from the plugin definition. You can find it as
AwsGrailsPlugin (Line: 37) --> AwsPluginSupport (Line: 86) --> MetaClassInjector (Line: 50)
You can also see in MetaClassInjector (around line 45 and 46), the target classes are controller and service classes. Hence you find the closure sesMail available in those 2 artefacts.
I hope it is clear enough to address your curiousness. :)