45 lines
2.0 KiB
Racket
45 lines
2.0 KiB
Racket
#lang syndicate
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(require (only-in racket/string string-trim))
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(require "../drivers/tcp.rkt")
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(require "../demand-matcher.rkt")
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(define (spawn-session them us)
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(define user (gensym 'user))
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(define remote-detector (at-meta (?!)))
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(define peer-detector (advertise `(,(?!) says ,?)))
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(define (send-to-remote fmt . vs)
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(message (at-meta (tcp-channel us them (string->bytes/utf-8 (apply format fmt vs))))))
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(define (say who fmt . vs)
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(unless (equal? who user) (send-to-remote "~a ~a\n" who (apply format fmt vs))))
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(list (send-to-remote "Welcome, ~a.\n" user)
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(spawn/stateless
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(lambda (e)
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(match e
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[(message (at-meta (tcp-channel _ _ bs)))
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(message `(,user says ,(string-trim (bytes->string/utf-8 bs))))]
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[(message `(,who says ,what))
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(say who "says: ~a" what)]
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[(? patch? p)
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(if (patch/removed? (patch-project p remote-detector))
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(quit (send-to-remote "Goodbye!\n"))
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(let-values (((arrived departed) (patch-project/set/single p peer-detector)))
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(list (for/list [(who arrived)] (say who "arrived."))
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(for/list [(who departed)] (say who "departed.")))))]
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[#f #f]))
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(patch-seq
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(sub `(,? says ,?)) ;; read actual chat messages
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(sub (advertise `(,? says ,?))) ;; observe peer presence
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(pub `(,user says ,?)) ;; advertise our presence
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(sub (tcp-channel them us ?) #:meta-level 1) ;; read from remote client
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(sub (advertise (tcp-channel them us ?)) #:meta-level 1) ;; monitor remote client
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(pub (tcp-channel us them ?) #:meta-level 1) ;; we will write to remote client
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))))
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(spawn-tcp-driver)
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(spawn-network
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(spawn-demand-matcher (advertise (tcp-channel (?!) (?! (tcp-listener 5999)) ?))
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(observe (tcp-channel (?!) (?! (tcp-listener 5999)) ?))
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#:meta-level 1
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spawn-session))
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