Instrumented echo server
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#lang racket/base
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(require racket/match)
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(require racket/tcp)
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(require racket/port)
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(require minimart)
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(require minimart/drivers/timer)
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(require logbook)
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(define L (default-logbook))
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(define E (standard-logbook-entry L "minimart" "echo-server"))
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(define Tmem (logbook-table E "memory-use" #:column-spec '(time-ms memory-use)))
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(define Tconn (logbook-table E "connections" #:column-spec '(time-ms connection-count)))
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(define connection-count 0)
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(define (statistician)
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(list (spawn (lambda (e s)
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(match e
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[(message (timer-expired 'statistician now) _ _)
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(collect-garbage)
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(collect-garbage)
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(collect-garbage)
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(write-logbook-datum! Tmem (list (/ now 1000.0) (current-memory-use)))
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(write-logbook-datum! Tconn (list (/ now 1000.0) connection-count))
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(transition s (send (set-timer 'statistician 10000 'relative)))]
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[_ #f]))
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#f
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(list (sub (timer-expired 'statistician ?))))
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(send (set-timer 'statistician 10000 'relative))))
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(define (listener port-number)
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(spawn (lambda (e s)
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(match e
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[(message (event _ (list (list in out))) _ _)
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(transition s (connection in out))]
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[_ #f]))
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#f
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(list (sub (event (tcp-accept-evt (tcp-listen port-number 4 #t)) ?)
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#:meta-level 1))))
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(define (connection in out)
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(set! connection-count (+ connection-count 1))
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(spawn (lambda (e s)
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(match e
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[(message (event _ (list (? eof-object?))) _ _)
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(close-input-port in)
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(close-output-port out)
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(set! connection-count (- connection-count 1))
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(transition s (quit))]
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[(message (event _ (list line)) _ _)
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(fprintf out "~a\n" line)
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(flush-output out)
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(transition s '())]
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[_ #f]))
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#f
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(list (sub (event (read-line-evt in 'any) ?)
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#:meta-level 1))))
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(run-ground (listener 5999)
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(spawn-timer-driver)
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(statistician))
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