filesystem driver
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#lang syndicate/actor
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;; Filesystem change monitor driver
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(provide (struct-out file-content)
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spawn-filesystem-driver)
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(require syndicate/protocol/standard-relay)
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(struct file-content (name reader-proc content) #:prefab) ;; ASSERTION
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(struct file-changed (name) #:prefab) ;; MESSAGE
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(define (spawn-filesystem-driver)
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(actor #:name 'filesystem-driver
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(during/actor (observe (file-content $name $reader-proc _))
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#:name (list 'file-content name reader-proc)
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(track-file name reader-proc))))
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(define (read-file name reader-proc)
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(and (file-exists? name)
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(reader-proc name)))
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(define (track-file name reader-proc)
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(define control-ch (make-channel))
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(thread (lambda () (track-file-changes name control-ch)))
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(field [content (read-file name reader-proc)])
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(assert (file-content name reader-proc (content)))
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(on (message (inbound (file-changed name)))
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(content (read-file name reader-proc)))
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(on-stop (channel-put control-ch 'quit)))
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(define (track-file-changes name control-ch)
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(let loop ()
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(sync (handle-evt control-ch
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(lambda (msg)
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;; (log-info "track-file-changes ~v: ~v" name msg)
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(match msg
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['quit (void)])))
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(if (file-exists? name) ;; TODO: TOCTTOU :-(
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(handle-evt (filesystem-change-evt name)
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(lambda (_dummy)
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;; (log-info "track-file-changes ~v: changed" name)
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(send-ground-message (file-changed name))
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(loop)))
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(let-values (((parent-path _leaf _syntactically-dir?)
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(split-path (path->complete-path name))))
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(handle-evt (filesystem-change-evt parent-path)
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(lambda (_dummy)
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;; (log-info "track-file-changes ~v: directory changed" name)
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(send-ground-message (file-changed name))
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(loop))))))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(spawn-filesystem-driver)
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@ -0,0 +1,21 @@
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#lang syndicate/actor
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(require/activate syndicate/drivers/filesystem)
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(require racket/file)
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(require (only-in racket/port read-bytes-line-evt))
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(require (only-in racket/string string-trim string-split))
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(let ((e (read-bytes-line-evt (current-input-port) 'any)))
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(actor #:name 'monitor-shell
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(stop-when (message (inbound (external-event e (list (? eof-object? _)))))
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(send! (list "close" ?)))
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(on (message (inbound (external-event e (list (? bytes? $command-bytes)))))
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(send! (string-split (string-trim (bytes->string/utf-8 command-bytes)))))))
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(actor #:name 'monitor-opener
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(on (message (list "open" $name))
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(actor #:name (list 'monitor name)
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(stop-when (message (list "close" name)))
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(on (asserted (file-content name file->bytes $bs))
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(log-info "~a: ~v" name bs)))))
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