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Comment:More on portlogger
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SHA1: 53b72738b7831410857aff27f7edcff50fc6cdd8
User & Date: matt on 2014-08-27 04:20:13
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Context
2014-08-27
21:53
Marking ports as taken/released/failed now working. One race condtion taken care of but one remains. check-in: 5051742e65 user: matt tags: v1.60
04:20
More on portlogger check-in: 53b72738b7 user: matt tags: v1.60
2014-08-26
23:17
Added debug to portlogger check-in: c02687e1a4 user: matt tags: v1.60
Changes
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Modified portlogger.scm from [39b1bee932] to [ec84e46c0a]. 

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;; Copyright 2006-2014, Matthew Welland.
;; 
;;  This program is made available under the GNU GPL version 2.0 or
;;  greater. See the accompanying file COPYING for details.
;; 
;;  This program is distributed WITHOUT ANY WARRANTY; without even the
;;  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR


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;; Copyright 2006-2014, Matthew Welland.
;; 
;;  This program is made available under the GNU GPL version 2.0 or
;;  greater. See the accompanying file COPYING for details.
;; 
;;  This program is distributed WITHOUT ANY WARRANTY; without even the
;;  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
︙︙
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		db
		(lambda ()
		  ;; (fold-row (lambda (var curr) (or var curr)) #f db "SELECT var FROM foo WHERE id=100;")
		  (let* ((curr #f)
			 (res  #f))
		    (set! curr (sqlite3:fold-row
				(lambda (var curr)
				  (or var curr))
				"not-tried"
				qry3
				portnum))
		    (print "curr=" curr)
		    (set! res (case (string->symbol curr)
				((released)  (sqlite3:execute qry2 "taken" portnum) 'taken)
				((not-tried) (sqlite3:execute qry1 portnum "taken") 'taken)
				((taken)                                            'already-taken)
				((failed)                                           'failed)
				(else                                               'error)))
		    (print "res=" res)
		    res)))))
    (sqlite3:finalize! qry1)
    (sqlite3:finalize! qry2)
    (sqlite3:finalize! qry3)
    res))

;; set port to "released", "failed" etc.
;; 
(define (portlogger:set-port db portnum value)
  (sqlite3:execute db "UPDATE ports SET state=? WHERE portnum=?;" value portnum))






;;======================================================================
;; MAIN
;;======================================================================




(let* ((db      (portlogger:open-db (conc "/tmp/." (current-user-name))))
       (args    (cdr (argv)))
       (numargs (length args)))
  (cond
   ((> numargs 1) ;; most commands
    (case (string->symbol (car args)) ;; commands with two or more params
      ((take)(portlogger:take-port db (string->number (cadr args))))
      ((set) (portlogger:set-port db 
				  (string->number (cadr args))
				  (caddr args))))))


  (sqlite3:finalize! db))

     









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		db
		(lambda ()
		  ;; (fold-row (lambda (var curr) (or var curr)) #f db "SELECT var FROM foo WHERE id=100;")
		  (let* ((curr #f)
			 (res  #f))
		    (set! curr (sqlite3:fold-row
				(lambda (var curr)
				  (or curr var curr))
				"not-tried"
				qry3
				portnum))
		    ;; (print "curr=" curr)
		    (set! res (case (string->symbol curr)
				((released)  (sqlite3:execute qry2 "taken" portnum) 'taken)
				((not-tried) (sqlite3:execute qry1 portnum "taken") 'taken)
				((taken)                                            'already-taken)
				((failed)                                           'failed)
				(else                                               'error)))
		    ;; (print "res=" res)
		    res)))))
    (sqlite3:finalize! qry1)
    (sqlite3:finalize! qry2)
    (sqlite3:finalize! qry3)
    res))

;; set port to "released", "failed" etc.
;; 
(define (portlogger:set-port db portnum value)
  (sqlite3:execute db "UPDATE ports SET state=? WHERE port=?;" value portnum))

;; set port to failed (attempted to take but got error)
;;
(define (portlogger:set-failed db portnum)
  (sqlite3:execute db "UPDATE ports SET state='failed',fail_count=fail_count+1 WHERE port=?;" portnum))

;;======================================================================
;; MAIN
;;======================================================================



(define (portlogger:main . args)
  (let* ((db      (portlogger:open-db (conc "/tmp/." (current-user-name))))

	 (numargs (length args))
	 (result  (cond
		   ((> numargs 1) ;; most commands
		    (case (string->symbol (car args)) ;; commands with two or more params
		      ((take)(portlogger:take-port db (string->number (cadr args))))
		      ((set) (portlogger:set-port db 
						  (string->number (cadr args))
						  (caddr args))
		       (caddr args))
		      ((failed)(portlogger:set-failed db (string->number (cadr args))) 'failed))))))
    (sqlite3:finalize! db)
    result))
     
(print (apply portlogger:main (cdr (argv))))

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