56 lines
1.9 KiB
Racket
56 lines
1.9 KiB
Racket
#lang minimart
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(require racket/set)
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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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(require "../userland.rkt")
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(define (spawn-session them us)
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(define (send-to-remote fmt . vs)
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(do (send #:meta-level 1 (tcp-channel us them (string->bytes/utf-8 (apply format fmt vs))))))
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(define tcp-gestalt (gestalt-union (pub (tcp-channel us them ?) #:meta-level 1)
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(sub (tcp-channel them us ?) #:meta-level 1 #:level 1)
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(sub (tcp-channel them us ?) #:meta-level 1)))
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(define (decode-input bs) (string-trim (bytes->string/utf-8 bs)))
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(define (read-chunk) (receive [(message (tcp-channel _ _ bs) 1 #f) (decode-input bs)]))
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(userland-thread #:gestalt tcp-gestalt
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(wait-for-gestalt tcp-gestalt)
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(send-to-remote "What is your name? > ")
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(define user (read-chunk))
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(send-to-remote "Welcome, ~a.\n" user)
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(do (routing-update (gestalt-union tcp-gestalt
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(sub `(,? says ,?) #:level 1)
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(sub `(,? says ,?))
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(pub `(,user says ,?)))))
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(define (say who fmt . vs)
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(unless (equal? who user)
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(send-to-remote "~a ~a\n" who (apply format fmt vs))))
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(let loop ((old-peers (set)))
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(match (next-event)
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[(message (tcp-channel _ _ bs) 1 #f)
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(do (send `(,user says ,(decode-input bs))))
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(loop old-peers)]
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[(message `(,who says ,what) 0 #f)
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(say who "says: ~a" what)
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(loop old-peers)]
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[(routing-update g)
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(when (gestalt-empty? (gestalt-filter g tcp-gestalt)) (do (quit)))
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(define new-peers (gestalt-project/single g (project-pubs `(,(?!) says ,?))))
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(for/list [(who (set-subtract new-peers old-peers))] (say who "arrived."))
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(for/list [(who (set-subtract old-peers new-peers))] (say who "departed."))
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(loop new-peers)]))))
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(spawn-tcp-driver)
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(spawn-world
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(spawn-demand-matcher (tcp-channel (?! (tcp-address ? ?)) (?! (tcp-listener 5999)) ?)
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#:meta-level 1
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spawn-session))
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