Megatest

(include "common_records.scm")
(include "db_records.scm")
(include "key_records.scm")
(include "run_records.scm")

;; timestamp type (val1 val2 ...)
;; type: meta-info, step
(define *incoming-writes*      '())
(define *completed-writes*   '())
(define *incoming-last-time* (current-seconds))
(define *incoming-mutex*     (make-mutex))
(define *completed-mutex*    (make-mutex))
(define *cache-on* #f)

(define (db:set-sync db)
  (let* ((syncval  (config-lookup *configdat* "setup"     "synchronous"))
	 (val      (cond   ;; 0 | OFF | 1 | NORMAL | 2 | FULL;
		    ((not syncval) #f)
		    ((string->number syncval)

(define (db:write-cached-data)
  (open-run-close
   (lambda (db . junkparams)
     (let ((queries    (make-hash-table))
	   (data       #f))
       (mutex-lock! *incoming-mutex*)
       (set! data (reverse *incoming-writes*)) ;;  (sort ... (lambda (a b)(< (vector-ref a 1)(vector-ref b 1)))))
       (set! *incoming-writes* '())
       (mutex-unlock! *incoming-mutex*)
       (if (> (length data) 0)
	   (debug:print-info 4 "Writing cached data " data))
       ;; prepare the needed statements
       (for-each (lambda (request-item)
		   (let ((stmt-key (vector-ref request-item 0)))
		     (if (not (hash-table-ref/default queries stmt-key #f))
			 (let ((stmt (alist-ref stmt-key db:queries)))
			   (if stmt
			       (hash-table-set! queries stmt-key (sqlite3:prepare db (car stmt)))
			       (debug:print 0 "ERROR: Missing query spec for " stmt-key "!"))))))
		 data)
       ;; No outer loop needed. Single loop for write items only. Reads trigger flush of queue






       ;; and then are executed.



       (sqlite3:with-transaction 
	db
	(lambda ()
	  (debug:print-info 11 "flushing " data " to db")

	  (for-each
	   (lambda (hed)

	     (let ((params   (vector-ref hed 2))
		   (stmt-key (vector-ref hed 0)))


	       (debug:print-info 11 "Executing " stmt-key " for " params)
	       (apply sqlite3:execute (hash-table-ref queries stmt-key) params)))
	   data)))

       ;; let all the waiting calls know all is done
       (mutex-lock! *completed-mutex*)
       (set! *completed-writes* (append *completed-writes* data))
       (mutex-unlock! *completed-mutex*)
       ;; finalize the statements
       (for-each (lambda (stmt-key)
		   (sqlite3:finalize! (hash-table-ref queries stmt-key)))
		 (hash-table-keys queries))
       ;; keep a little chest thumping data around
       (let ((cache-size (length data)))
	 (if (> cache-size *max-cache-size*)
	     (set! *max-cache-size* cache-size)))
       ))
   #f))


;; The queue is a list of vectors where the zeroth slot indicates the type of query to
;; apply and the second slot is the time of the query and the third entry is a list of 
;; values to be applied
;;
;; (define (db:process-queue db pubsock indata)
;;   (let* ((data       (sort indata (lambda (a b)
;; 				    (< (cdb:packet-get-qtime a)(cdb:packet-get-qtime b))))))
;;     (for-each
;;      (lambda (item)
;;        (db:process-queue-item db pubsock item))
;;      data)))

(define (db:queue-write-and-wait db item)
  (let ((res      #f)
	(got-it   #f)
	(qry-sig  (cdb:packet-get-query-sig item)))
    (mutex-lock! *incoming-mutex*)
    (set! *incoming-writes (cons item *incoming-writes*))
    (mutex-unlock! *incoming-mutex*)
    ;; let the queue build three times, look for processed 
    ;; item.
    (let loop ((count 0))
      (debug:print-info 11 "db:queue-write-and-wait count=" count ", item=" item)
      (thread-sleep! 0.1)
      (mutex-lock! *completed-mutex*)
      (for-each (lambda (result)
		  (if (equal? (cdb:packet-get-query-sig result) qry-sig)
		      (set! got-it #t)))
		*completed-writes*)
      (mutex-unlock! *completed-mutex*)
      (if (not got-it)
	  (if (< count 4) ;; give it 3/10 of a second of queue up time
	      (loop (+ count 1))
	      (db:write-cached-data))))
    ;; at the point db:write-cached-data was called either by this call
    ;; or by another. Now every 1/100 sec check to see if this query is
    ;; at the "head" of the completed queue and pop it off
    (let loop () 
      (thread-sleep! 0.001)
      ;; there must always be at least one item in the completed-writes at this point, right?
      (mutex-lock! *completed-mutex*)
      (set! res (car *completed-writes*))
      (mutex-unlock! *completed-mutex*)
      (if (equal? (cdb:packet-get-query-sig res) qry-sig) ;; yay! we are done!
	  (begin
	    (mutex-lock! *completed-mutex*)
	    (set! *completed-writes* (cdr *completed-writes*))
	    (mutex-unlock! *completed-mutex*)
	    res)
	    (loop)))))
	  
(define (db:process-queue-item db item)
  (let* ((stmt-key       (cdb:packet-get-qtype item))
	 (qry-sig        (cdb:packet-get-query-sig item))
	 (return-address (cdb:packet-get-client-sig item))
	 (params         (cdb:packet-get-params item))
	 (query          (let ((q (alist-ref stmt-key db:queries)))
			   (if q (car q) #f))))
    (debug:print-info 11 "Special queries/requests stmt-key=" stmt-key ", return-address=" return-address ", query=" query ", params=" params)
    (cond
     (query
      ;; transactionize needed here.
      ;; (case *transport-type*
      ;;   ((http)(db:queue-write-and-wait db item))
      ;;   (else  
       (apply sqlite3:execute db query params)
       ;; ))
       (server:reply return-address qry-sig #t #t))
     ((member stmt-key db:special-queries)
      (debug:print-info 11 "Handling special statement " stmt-key)
      (case stmt-key
	((immediate)
	 (let ((proc      (car params))
	       (remparams (cdr params)))
	   ;; we are being handed a procedure so call it