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chat-client example

This commit is contained in:
Tony Garnock-Jones 2013-05-14 12:38:59 -04:00
parent c1bf75a880
commit 9d854a263f
2 changed files with 95 additions and 0 deletions
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47
marketplace/examples/chat-client.rkt Normal file
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@ -0,0 +1,47 @@
#lang marketplace
(require racket/port)
;; Usually it's OK to just use display and friends directly.
;; Here we have a console output driver just to show how it's done.
(spawn #:debug-name 'console-output-driver
#:child
(transition/no-state
(endpoint #:subscriber (list 'console-output ?)
[(list 'console-output item)
(begin (printf "~a" item)
(void))])))
(spawn #:debug-name 'console-input-driver
#:child
(transition/no-state
(endpoint #:publisher (list 'console-input ?)
#:name 'input-relay
#:on-absence
(list (send-message (list 'console-output "Connection terminated.\n"))
(quit)))
(endpoint #:subscriber (cons (read-line-evt (current-input-port) 'any) ?)
[(cons _ (? eof-object?))
(list (send-message (list 'console-output "Terminating on local EOF.\n"))
(delete-endpoint 'input-relay))]
[(cons _ (? string? line))
(send-message (list 'console-input line))])))
(spawn #:debug-name 'outbound-connection
#:child
(let ((local (tcp-handle 'outbound))
(remote (tcp-address "localhost" 5999)))
(transition/no-state
(endpoint #:subscriber (list 'console-input ?)
#:on-absence (quit)
[(list 'console-input line)
(list (send-message (list 'console-output (format "> ~a \n" line)))
(send-message (tcp-channel local remote (string-append line "\n"))))])
(endpoint #:publisher (tcp-channel local remote ?))
(endpoint #:subscriber (tcp-channel remote local ?)
#:on-absence (quit)
[(tcp-channel _ _ (? eof-object?))
(quit)]
[(tcp-channel _ _ data)
(list (send-message (list 'console-output (format "< ~a" data)))
(void))]))))

48
marketplace/scribblings/examples.scrbl
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@ -83,3 +83,51 @@ Racket programs.
#:on-absence (announce who 'departed)
[`(,who says ,what) (say "~a: ~a" who what)])))
)
@section[#:tag "chat-client-example"]{TCP chat client}
@#reader scribble/comment-reader (racketmod #:file "examples/chat-client.rkt" marketplace
(require racket/port)
(spawn #:debug-name 'console-output-driver
#:child
(transition/no-state
(endpoint #:subscriber (list 'console-output ?)
[(list 'console-output item)
(begin (printf "~a" item)
(void))])))
(spawn #:debug-name 'console-input-driver
#:child
(transition/no-state
(endpoint #:publisher (list 'console-input ?)
#:name 'input-relay
#:on-absence
(list (send-message (list 'console-output "Connection terminated.\n"))
(quit)))
(endpoint #:subscriber (cons (read-line-evt (current-input-port) 'any) ?)
[(cons _ (? eof-object?))
(list (send-message (list 'console-output "Terminating on local EOF.\n"))
(delete-endpoint 'input-relay))]
[(cons _ (? string? line))
(send-message (list 'console-input line))])))
(spawn #:debug-name 'outbound-connection
#:child
(let ((local (tcp-handle 'outbound))
(remote (tcp-address "localhost" 5999)))
(transition/no-state
(endpoint #:subscriber (list 'console-input ?)
#:on-absence (quit)
[(list 'console-input line)
(list (send-message (list 'console-output (format "> ~a \n" line)))
(send-message (tcp-channel local remote (string-append line "\n"))))])
(endpoint #:publisher (tcp-channel local remote ?))
(endpoint #:subscriber (tcp-channel remote local ?)
#:on-absence (quit)
[(tcp-channel _ _ (? eof-object?))
(quit)]
[(tcp-channel _ _ data)
(list (send-message (list 'console-output (format "< ~a" data)))
(void))]))))
)