125 lines
5.0 KiB
Racket
125 lines
5.0 KiB
Racket
#lang syndicate/actor
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;; Generic relay for WebSockets/TCP/etc-based participation in a network.
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(provide spawn-broker-server
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(struct-out broker-scope)
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(struct-out broker-data))
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(require racket/set)
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(require racket/match)
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(require net/rfc6455)
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(require json)
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;; (require (except-in "../main.rkt" dataspace assert))
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;; (require "../actor.rkt")
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(require syndicate/trie)
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(require syndicate/patch)
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(require syndicate/demand-matcher)
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(require syndicate/protocol/advertise)
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(require/activate syndicate/drivers/timer)
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(require/activate syndicate/drivers/websocket)
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(require "protocol.rkt")
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(define-logger syndicate-broker)
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(struct broker-scope (host port path) #:prefab)
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(struct broker-data (scope assertion) #:prefab)
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(define broker-data-parenthesis (struct-type->parenthesis struct:broker-data))
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(define broker-scope-parenthesis (struct-type->parenthesis struct:broker-scope))
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;; Depends on timer driver and websocket driver running at the given metalevel.
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(define (spawn-broker-server port
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#:ssl-options [ssl-options #f])
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(define any-client any-websocket-remote-client)
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(define server-id (websocket-local-server port ssl-options))
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(spawn-demand-matcher (inbound (advertise (websocket-message (?! any-client) server-id ?)))
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(inbound (observe (websocket-message (?! any-client) server-id ?)))
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(lambda (c) (spawn-connection-handler c server-id))
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#:name 'broker:dm))
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(define (spawn-connection-handler c server-id)
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(actor #:name (list 'broker server-id)
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(define scope (broker-scope (websocket-remote-client-request-host c)
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(websocket-remote-client-request-port c)
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(websocket-remote-client-request-path c)))
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(define (arm-ping-timer!)
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(send! (outbound (set-timer c (ping-interval) 'relative))))
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(define (send-event e)
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(send! (outbound (websocket-message server-id c (jsexpr->string (lift-json-event e))))))
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(on-start (arm-ping-timer!)
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(log-syndicate-broker-info "Starting broker connection from ~v" c))
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(stop-when (retracted (inbound (advertise (websocket-message c server-id _)))))
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(assert (outbound (advertise (websocket-message server-id c _))))
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(on (asserted (inbound
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(websocket-peer-details server-id c _ _ $remote-addr $remote-port)))
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(log-syndicate-broker-info "Connection ~v is from ~a:~a" c remote-addr remote-port))
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(on (message (inbound (timer-expired c _)))
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(arm-ping-timer!)
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(send-event 'ping))
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(on (message (inbound (websocket-message c server-id $data)))
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(match (drop-json-action (string->jsexpr data))
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['ping (send-event 'pong)]
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['pong (void)]
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[(? patch? p) (patch! (log-packet c 'inbound 'patch (wrap-patch scope p)))]
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[(message body) (send! (log-packet c 'inbound 'message (broker-data scope body)))]))
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(on-event
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[(? patch? p) (send-event (log-packet c 'outbound 'patch (unwrap-patch scope p)))]
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[(message (broker-data (== scope) body))
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(send-event (message (log-packet c 'outbound 'message body)))])
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(on-stop (log-syndicate-broker-info "Ending broker connection from ~v" c))))
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(define (log-packet c direction kind value)
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(log-syndicate-broker-debug "Broker: ~v: ~a ~a\n~v" c direction kind value)
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value)
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(define (unwrap-patch scope p)
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(match-define (patch added removed) p)
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(patch (unwrap-trie scope added) (unwrap-trie scope removed)))
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(define (unwrap-trie scope t)
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(if (trie-empty? t)
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t
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(let ((observations (trie-step t observe-parenthesis)))
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(trie-union (trie-prepend observe-parenthesis (unwrap-trie scope observations))
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(trie-step* t (list broker-data-parenthesis
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broker-scope-parenthesis
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(broker-scope-host scope)
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(broker-scope-port scope)
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(broker-scope-path scope)))))))
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(define (wrap-patch scope p)
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(match-define (patch added removed) p)
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(patch (wrap-trie scope added) (wrap-trie scope removed)))
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(define (wrap-trie scope t)
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(if (trie-empty? t)
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t
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(let ((observations (trie-step t observe-parenthesis)))
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(trie-union (trie-prepend observe-parenthesis (wrap-trie scope observations))
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(wrap-trie* scope t)))))
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(define (wrap-trie* scope t)
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(pattern->trie #t (broker-data scope (embedded-trie t))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(let ((ssl-options
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(match (current-command-line-arguments)
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[(vector c p) (websocket-ssl-options c p)]
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[_ #f])))
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(dataspace (schedule-action! (spawn-broker-server 8000))
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(when ssl-options
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(schedule-action! (spawn-broker-server 8443 #:ssl-options ssl-options)))
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(forever)))
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