Browse Source

Operational transformation example

render_dataspace
Tony Garnock-Jones 5 years ago
parent
commit
d67d490885
  1. 1
      examples/operational-transformation/.gitignore
  2. 11
      examples/operational-transformation/README.md
  3. 70
      examples/operational-transformation/syndicate-server.rkt

1
examples/operational-transformation/.gitignore

@ -0,0 +1 @@
compiled/

11
examples/operational-transformation/README.md

@ -0,0 +1,11 @@
# Operational Transformation
The program `syndicate-server.rkt` is a port of
[`server.rkt`](https://github.com/tonyg/racket-operational-transformation/blob/master/operational-transformation-demo/server.rkt)
to Syndicate.
It accepts the same command-line arguments, and works with unmodified
[clients](https://github.com/tonyg/racket-operational-transformation/blob/master/operational-transformation-demo/client.rkt);
see the
[README](https://github.com/tonyg/racket-operational-transformation/blob/master/README.md)
for more information.

70
examples/operational-transformation/syndicate-server.rkt

@ -0,0 +1,70 @@
#lang syndicate/actor
(require racket/file)
(require racket/serialize)
(require operational-transformation)
(require operational-transformation/text/simple-document)
(require/activate syndicate/drivers/tcp)
(require/activate syndicate/drivers/line-reader)
(struct file-being-edited (name) #:prefab)
(struct proposed-op (p) #:prefab)
(struct accepted-op (p) #:prefab)
(define cmdline-port (make-parameter 5888))
(define cmdline-filename (make-parameter "info.rkt"))
(actor (react (field [state (make-server (simple-document
(if (file-exists? (cmdline-filename))
(begin (log-info "loading ~v" (cmdline-filename))
(file->string (cmdline-filename)))
(begin (log-info "will create ~v" (cmdline-filename))
""))))])
(assert (extract-snapshot (state)))
(begin/dataflow
(display-to-file (simple-document-text (server-state-document (state)))
(cmdline-filename)
#:exists 'replace))
(on (message (proposed-op $p))
(state (incorporate-operation-from-client (state) p))
(define sp (extract-operation (state)))
(when sp (send! (accepted-op sp))))))
(actor (define s (tcp-listener (cmdline-port)))
(log-info "listening on port ~v" (cmdline-port))
(forever (assert (advertise (observe (tcp-channel _ s _))))
(during/actor (advertise (tcp-channel $c s _))
(assert (advertise (tcp-channel s c _)))
(on-start (log-info "~a: connected" c))
(on-stop (log-info "~a: disconnected" c))
(connection-react c s (cmdline-filename)))))
(define (connection-react c s filename)
(define (output v)
;; (log-info "~a: sending them ~v" c v)
(define p (open-output-bytes))
(write (serialize v) p)
(newline p)
(send! (tcp-channel s c (get-output-bytes p))))
(on-start
(output filename)
(let-event [(asserted ($ snapshot (server-snapshot _ _)))]
(output snapshot)
(react (on (message (accepted-op $p))
(output p)))))
(on (message (tcp-channel-line c s $line))
(send! (proposed-op (deserialize (read (open-input-bytes line)))))))
(module+ main
(require racket/cmdline)
(command-line
#:once-each
[("-p" "--port") server-port ((format "Server port (default ~v)" (cmdline-port)))
(cmdline-port server-port)]
#:args (filename)
(cmdline-filename filename)))
Loading…
Cancel
Save