Number of selected fields in a query

[Meemaw]

Is there some easy way to get number of selected fields in a query? Ideally from ExecutionContext, without doing a traversal.

[bbakerman]

You have to define what you mean by selected fields

query q {
    fieldA {
         x y z
    }
    aliasName : fieldA {
         x y z
    }
   field B {
       a b c {
           cX
           cY
           cZ
       }
   }
}

Is that 3 selected fields, 9 selected fields or 6 selected fields or more ??? There is no standard idea of what is a set of selected fields for an operation

So no there is nothing in ExecutionContext - you need to traverse the query

https://en.wikipedia.org/wiki/XY_problem

What do you want to achieve?

[Meemaw]

Would like to emit a metric for how many fields our clients are requesting, so we can reject those that are too big etc...

This looks like 11 fields to me (duplicates count) ~ counting the leaf resolvers.

[dondonz]

As @bbakerman you will have to traverse the query to obtain the information you're after

Have a look at https://www.graphql-java.com/documentation/instrumentation#query-depth-instrumentation, this can help you detect and stop queries beyond a certain complexity