Operational transformation example
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# Operational Transformation
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The program `syndicate-server.rkt` is a port of
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[`server.rkt`](https://github.com/tonyg/racket-operational-transformation/blob/master/operational-transformation-demo/server.rkt)
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to Syndicate.
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It accepts the same command-line arguments, and works with unmodified
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[clients](https://github.com/tonyg/racket-operational-transformation/blob/master/operational-transformation-demo/client.rkt);
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see the
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[README](https://github.com/tonyg/racket-operational-transformation/blob/master/README.md)
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for more information.
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#lang syndicate/actor
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(require racket/file)
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(require racket/serialize)
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(require operational-transformation)
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(require operational-transformation/text/simple-document)
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(require/activate syndicate/drivers/tcp)
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(require/activate syndicate/drivers/line-reader)
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(struct file-being-edited (name) #:prefab)
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(struct proposed-op (p) #:prefab)
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(struct accepted-op (p) #:prefab)
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(define cmdline-port (make-parameter 5888))
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(define cmdline-filename (make-parameter "info.rkt"))
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(actor (react (field [state (make-server (simple-document
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(if (file-exists? (cmdline-filename))
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(begin (log-info "loading ~v" (cmdline-filename))
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(file->string (cmdline-filename)))
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(begin (log-info "will create ~v" (cmdline-filename))
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""))))])
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(assert (extract-snapshot (state)))
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(begin/dataflow
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(display-to-file (simple-document-text (server-state-document (state)))
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(cmdline-filename)
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#:exists 'replace))
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(on (message (proposed-op $p))
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(state (incorporate-operation-from-client (state) p))
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(define sp (extract-operation (state)))
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(when sp (send! (accepted-op sp))))))
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(actor (define s (tcp-listener (cmdline-port)))
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(log-info "listening on port ~v" (cmdline-port))
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(forever (assert (advertise (observe (tcp-channel _ s _))))
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(during/actor (advertise (tcp-channel $c s _))
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(assert (advertise (tcp-channel s c _)))
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(on-start (log-info "~a: connected" c))
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(on-stop (log-info "~a: disconnected" c))
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(connection-react c s (cmdline-filename)))))
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(define (connection-react c s filename)
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(define (output v)
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;; (log-info "~a: sending them ~v" c v)
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(define p (open-output-bytes))
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(write (serialize v) p)
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(newline p)
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(send! (tcp-channel s c (get-output-bytes p))))
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(on-start
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(output filename)
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(let-event [(asserted ($ snapshot (server-snapshot _ _)))]
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(output snapshot)
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(react (on (message (accepted-op $p))
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(output p)))))
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(on (message (tcp-channel-line c s $line))
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(send! (proposed-op (deserialize (read (open-input-bytes line)))))))
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(module+ main
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(require racket/cmdline)
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(command-line
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#:once-each
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[("-p" "--port") server-port ((format "Server port (default ~v)" (cmdline-port)))
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(cmdline-port server-port)]
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#:args (filename)
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(cmdline-filename filename)))
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