Database information from validate_doc_update

[first-l...@yandex.ru]

Hello.

Can I get information about the database as a function of 
validate_doc_update? For example, to find out the size of the database 
or the number of documents.

Example:
function(newDoc, oldDoc, userCtx) {
 if ( thisDb.disk_size > 1000 ) throw({forbidden : 'you have exceeded 
the limit'});
}

It is possible?

Thanks.