example using servlet-data
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@ -7,6 +7,8 @@
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handle-fatal-error
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httpd-responses
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(subset srfi-1 (iota))
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defrec-package
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locks
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let-opt
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)
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(begin
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@ -15,12 +17,21 @@
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;; profiling. Note to get the resulting picture, gnuplot must be
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;; installed.
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(define file-name #f)
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(define file-names-to-delete '())
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(define (add-file-name-to-delete! file-name)
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(set! file-names-to-delete (cons file-name file-names-to-delete)))
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(define counter 0)
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(define-record state
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file-name
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file-names-to-delete
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(counter 0))
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(define (state-file-name)
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(state:file-name (get-servlet-data)))
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(define (state-file-names-to-delete)
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(state:file-names-to-delete (get-servlet-data)))
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(define (state-counter)
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(state:counter (get-servlet-data)))
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;; Leave this global. Server is running on a single system.
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(define gnuplot "/usr/bin/gnuplot")
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(define lock (make-lock))
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(define (profile req . maybe-update-text)
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(let* ((update-text (:optional maybe-update-text ""))
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@ -39,7 +50,7 @@
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(body (h1 "Serlvet Administration")
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(h2 "Profiling")
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(font (@ (color "red")) ,update-text)
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(p "Currently, there are " ,counter " profiles saved.")
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(p "Currently, there are " ,(state-counter) " profiles saved.")
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(ul
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(li (URL ,(new-profile-address new-url)
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"Create new profile")
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@ -63,7 +74,7 @@
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((returned-via? new-profile-address bindings)
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(new-profile req))
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((returned-via? result-address bindings)
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(if (zero? counter)
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(if (zero? (state-counter))
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(profile req "Now profiles created, currently. Select 'Create new profile' to create one.")
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(result req)))
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((returned-via? reset-address bindings)
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@ -85,18 +96,23 @@
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(profile req "Please enter a file name of an existing executable.")))))))
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(define (new-profile req)
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(format #t "profiling...~%")
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(profile-space file-name)
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(format #t "profile recorded in ~s~%" file-name)
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(set! counter (+ 1 counter))
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(profile req (format #f "Profile #~a generated" counter)))
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(let ((state (get-servlet-data)))
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(format #t "profiling...~%")
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(obtain-lock lock)
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(profile-space (state:file-name state))
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(release-lock lock)
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(format #t "profile recorded in ~s~%" (state:file-name state))
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(set-state:counter state (+ 1 (state:counter state)))
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(profile req (format #f "Profile #~a generated" (state:counter state)))))
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(define (result req)
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(let ((results (profile-results file-name))
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(let ((results (profile-results (state-file-name)))
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(gnuplot-data-file-name (create-temp-file "servlet-profiling.data"))
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(picture-file (create-temp-file "servlet-profiling.picture"))
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(get-total-bytes (lambda (space-info)
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(total-bytes (space-info-total space-info)))))
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(total-bytes (space-info-total space-info))))
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(return-address (make-address))
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(reset-return-address (make-address)))
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(write-gnuplot-data-file gnuplot-data-file-name
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get-total-bytes
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results)
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@ -111,45 +127,76 @@ plot '~a' title 'Servlet Profiling ~a' with lines"
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)))))
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(delete-file gnuplot-data-file-name)
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(add-file-name-to-delete! picture-file)
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(send-html
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`(html
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(title "Servlet Administration -- Profiling Results")
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(body
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(h1 "Servlet-Administration")
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(h2 "Profiling Results")
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(h3 "Picture")
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,(if (zero? status)
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`(image (@ (src ,picture-file)))
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`(p "An error occured while generating the profiling results picture."
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(br)
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"Are you sure, you have " (q "gnuplot")
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" installed at " (q ,gnuplot) "?"))
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(hr)
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(h3 "Data")
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(table
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(tr (th "#") (th "Total bytes occupied"))
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,@(map (lambda (num space-info)
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`(tr (td ,(+ 1 num))
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(td ,(get-total-bytes space-info))))
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(iota (length results))
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results))))))))
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(let* ((req (show-results status picture-file get-total-bytes results
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return-address reset-return-address))
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(bindings (get-bindings req)))
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(cond
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((returned-via? return-address bindings)
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(profile req "You may continue to make profiles."))
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((returned-via? reset-return-address bindings)
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(reset-and-return-to-main-page req))
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(else
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(error "unexpected return address")))))))
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(define (show-results status picture-file get-total-bytes results
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return-address reset-return-address)
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(send-html/suspend
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(lambda (new-url)
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`(html
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(title "Servlet Administration -- Profiling Results")
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(body
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(h1 "Servlet-Administration")
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(h2 "Profiling Results")
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(h3 "Picture")
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,(if (zero? status)
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`(image (@ (src ,picture-file)))
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`(p "An error occured while generating the profiling results picture."
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(br)
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"Are you sure, you have " (q "gnuplot")
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" installed at " (q ,gnuplot) "?"))
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(hr)
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(h3 "Data")
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(table
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(tr (th "#") (th "Total bytes occupied"))
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,@(map (lambda (num space-info)
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`(tr (td ,(+ 1 num))
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(td ,(get-total-bytes space-info))))
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(iota (length results))
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results))
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(hr)
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(p (URL ,(return-address new-url) "Return to previous page") (br)
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(URL ,(reset-return-address new-url)
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"Delete files, reset state and return to main page.")))))))
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(define (reset req)
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(reset-profiling-state!)
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(profile req "Profiling state reseted."))
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(define (delete-files)
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(for-each delete-filesys-object file-names-to-delete))
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(define (add-file-name-to-delete! file-name)
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(let ((state (get-servlet-data)))
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(set-state:file-names-to-delete
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state
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(cons file-name
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(state:file-names-to-delete state)))))
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(define (delete-files state)
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(let ((file-names-to-delete (state:file-names-to-delete state)))
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(if file-names-to-delete
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(for-each delete-filesys-object file-names-to-delete))))
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(define (reset-profiling-state!)
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(set! counter 0)
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(delete-files)
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(set! file-name (absolute-file-name (create-temp-file "servlet-profiling")))
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(set! file-names-to-delete (list file-name)))
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(let ((state (get-servlet-data)))
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(set-state:counter state 0)
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(delete-files state)
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(set-state:file-name state
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(absolute-file-name (create-temp-file "servlet-profiling")))
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(set-state:file-names-to-delete state
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(list (state:file-name state)))))
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(define (reset-and-return-to-main-page req)
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;; Overhead included :-|
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(reset-profiling-state!)
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(delete-files)
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(delete-files (get-servlet-data))
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(return-to-main-page req))
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(define (return-to-main-page req)
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"admin.scm" "admin.scm")))
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(define (main req)
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;; We'll fill this out soon.
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(set-servlet-data! (make-state #f #f))
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(reset-profiling-state!)
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(profile req))
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