> On Jul 23, 2017, at 8:54 PM, Philip McGrath <philip.mcgr...@gmail.com> wrote: > > I'm confused about why the following program is blaming the server for the > client's misuse of an applicable struct instance. More generally, I've tried > doing this in several different ways, and I can't figure out how to make > applicable structs that are still protected by contracts after > deserialization and blame the client module for misusing them. > > Thanks, > Philip > > #lang racket > > (module server racket > (require racket/serialize) > (provide (contract-out > [adder (-> natural-number/c (-> natural-number/c > natural-number/c))])) > (struct adder (base) > #:property prop:procedure > (λ (this x) > (+ (adder-base this) x)) > #:property prop:serializable > (make-serialize-info (λ (this) (vector (adder-base this))) > #'deserialize-info:adder-v0 > #f > (or (current-load-relative-directory) > (current-directory)))) > (define/contract make-adder > (-> natural-number/c (-> natural-number/c > natural-number/c)) > adder)
You defined make-adder with a contract. As far as it is concerned, its contract is with the surrounding module, which is server. Hence if it is misapplied, the server broke the contract of always protecting its entry channels (with a natural-number/c test). > (define deserialize-info:adder-v0 > (make-deserialize-info make-adder > (λ () (error 'adder > "can't have cycles")))) > (module+ deserialize-info > (provide deserialize-info:adder-v0))) > > > (require 'server racket/serialize) > > ((deserialize (serialize (adder 5))) 'not-a-number) > > -- > You received this message because you are subscribed to the Google Groups > "Racket Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to racket-users+unsubscr...@googlegroups.com > <mailto:racket-users+unsubscr...@googlegroups.com>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
