53 lines
2.0 KiB
Racket
53 lines
2.0 KiB
Racket
#lang imperative-syndicate
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(provide (struct-out server-connection)
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(struct-out server-inbound)
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(struct-out server-outbound)
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(struct-out server-envelope))
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(require "wire-protocol.rkt")
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(require imperative-syndicate/term)
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(require racket/set)
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;; Internal connection protocol
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(assertion-struct server-connection (connection-id scope))
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(assertion-struct server-inbound (connection-id body))
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(assertion-struct server-outbound (connection-id body))
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;; Internal isolation
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(assertion-struct server-envelope (scope body))
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(spawn #:name 'server-connection-factory
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(during/spawn (server-connection $id $scope)
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(define endpoints (set))
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(on (message (server-inbound id (Assert $ep $a)))
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(when (not (set-member? endpoints ep))
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(set! endpoints (set-add endpoints ep))
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(react
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(on-stop (set! endpoints (set-remove endpoints ep)))
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(field [assertion a])
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(assert (server-envelope scope (assertion)))
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(let ((! (lambda (ctor) (lambda (cs) (send! (server-outbound id (ctor ep cs)))))))
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(add-observer-endpoint! (lambda ()
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(let ((a (assertion)))
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(when (observe? a)
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(server-envelope scope (observe-specification a)))))
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#:on-add (! Add)
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#:on-remove (! Del)
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#:on-message (! Msg)))
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(on (message (server-inbound id (Assert ep $new-a)))
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(assertion new-a))
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(stop-when (message (server-inbound id (Clear ep)))))))
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(on (message (server-inbound id (Message $body)))
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(send! (server-envelope scope body)))
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(on (message (server-inbound id (Ping)))
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(send! (server-outbound id (Pong))))))
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