Megatest

    (sqlite3:execute db (conc "PRAGMA synchronous = " (or syncprag 1) ";")))) 

;; open an sql database inside a file lock
;; returns: db existed-prior-to-opening
;; RA => Returns a db handler; sets the lock if opened in writable mode
;;
(define (db:lock-create-open fname initproc)
  (let* ((parent-dir   (or (pathname-directory fname)(current-directory))) ;; no parent? go local
	 (dir-writable (file-write-access? parent-dir))
	 (file-exists  (file-exists? fname))
	 (file-write   (if file-exists
			   (file-write-access? fname)
			   dir-writable )))
    (if file-write ;; dir-writable
	(let (;; (lock    (obtain-dot-lock fname 1 5 10))

  (or *dbstruct-db*
      (let ((dbstruct (db:setup))) ;;  #f local: #t)))
	(set! *dbstruct-db* dbstruct)
	dbstruct)))
	  
;; Open the classic megatest.db file (defaults to open in toppath)
;;
;;   NOTE: returns a dbdat not a dbstruct!
;;
(define (db:open-megatest-db #!key (path #f))
  (let* ((dbpath       (or path (conc *toppath* "/megatest.db")))
	 (dbexists     (file-exists? dbpath))
	 (db           (db:lock-create-open dbpath
					    (lambda (db)
					      (db:initialize-main-db db)
					      (db:initialize-run-id-db db))))
	 (write-access (file-write-access? dbpath)))
    (if (and dbexists (not write-access))

	 
	 (finalize! db)
	 #t))))))
    
;; tbls is ( ("tablename" ( "field1" [#f|proc1] ) ( "field2" [#f|proc2] ) .... ) )
;; db's are dbdat's
;;
;; if last-update specified ("field-name" . time-in-seconds)
;;    then sync only records where field-name >= time-in-seconds
;;    IFF field-name exists
;;
(define (db:sync-tables tbls last-update fromdb todb . slave-dbs)
  (mutex-lock! *db-sync-mutex*)
  (handle-exceptions
   exn
   (begin
     (mutex-unlock! *db-sync-mutex*)
     (debug:print 0 *default-log-port* "EXCEPTION: database probably overloaded or unreadable in db:sync-tables.")
     (print-call-chain (current-error-port))

	   (numrecs     (make-hash-table))
	   (start-time  (current-milliseconds))
	   (tot-count   0))
       (for-each ;; table
	(lambda (tabledat)
	  (let* ((tablename  (car tabledat))
		 (fields     (cdr tabledat))
		 (use-last-update  (if last-update
				       (if (pair? last-update)
					   (member (car last-update)    ;; last-update field name
						   (map car fields))
					   (begin
					     (debug:print 0 *default-log-port* "ERROR: parameter last-update for db:sync-tables must be a pair, received: " last-update) ;; found in fields
					     #f))
				       #f))
		 (num-fields (length fields))
		 (field->num (make-hash-table))
		 (num->field (apply vector (map car fields)))
		 (full-sel   (conc "SELECT " (string-intersperse (map car fields) ",") 
				   " FROM " tablename (if use-last-update ;; apply last-update criteria
							  (conc " " (car last-update) ">=" (cdr last-update))
							  "")
				   ";"))
		 (full-ins   (conc "INSERT OR REPLACE INTO " tablename " ( " (string-intersperse (map car fields) ",") " ) "
				   " VALUES ( " (string-intersperse (make-list num-fields "?") ",") " );"))
		 (fromdat    '())
		 (fromdats   '())
		 (totrecords 0)
		 (batch-len  (string->number (or (configf:lookup *configdat* "sync" "batchsize") "10")))
		 (todat      (make-hash-table))

			fromdat-lst))
		  ))
		  fromdats)
		 (sqlite3:finalize! stmth)))
	     (append (list todb) slave-dbs))))
	tbls)
       (let* ((runtime      (- (current-milliseconds) start-time))
	      (should-print (or (debug:debug-mode 12)
				(common:low-noise-print 120 "db sync" (> runtime 500))))) ;; low and high sync times treated as separate.
	 (if should-print (debug:print 3 *default-log-port* "INFO: db sync, total run time " runtime " ms"))
	 (for-each 
	  (lambda (dat)
	    (let ((tblname (car dat))
		  (count   (cdr dat)))
	      (set! tot-count (+ tot-count count))
	      (if (> count 0)

                              last_update INTEGER DEFAULT (strftime('%s','now')))")
  (sqlite3:execute maindb "CREATE TRIGGER  IF NOT EXISTS update_run_stats_trigger AFTER UPDATE ON run_stats
                             FOR EACH ROW
                               BEGIN 
                                 UPDATE run_stats SET last_update=(strftime('%s','now'))
                                   WHERE id=old.id;
                               END;"))

(define *global-db-store* (make-hash-table))

(define (db:get-access-mode)
  (if (args:get-arg "-use-db-cache") 'cached 'rmt))

;; Add db direct
;;
(define (db:dispatch-query access-mode rmt-cmd db-cmd . params)
  (if (eq? access-mode 'cached)
      (apply db:call-with-cached-db db-cmd params)
      (apply rmt-cmd params)))

;; return the target db handle so it can be used
;;
(define (db:cache-for-read-only source target #!key (use-last-update #f))
  (if (and (hash-table-ref/default *global-db-store* target #f)
	   (>= (file-modification-time target)(file-modification-time source)))
      (hash-table-ref *global-db-store* target)
      (let* ((toppath   (launch:setup))
	     (targ-db-last-mod (if (file-exists? target)
				   (file-modification-time target)
				   0))
	     (cache-db  (or (hash-table-ref/default *global-db-store* target #f)
			    (db:open-megatest-db path: target)))
	     (source-db (db:open-megatest-db path: source))
	     (curr-time (current-seconds))
	     (res      '())
	     (last-update (if use-last-update (cons "last_update" targ-db-last-mod) #f)))
	(db:sync-tables (db:sync-main-list source-db) last-update source-db cache-db)
	(db:sync-tables db:sync-tests-only last-update source-db cache-db)
	(hash-table-set! *global-db-store* target cache-db)
	cache-db)))

;; call a proc with a cached db
;;
(define (db:call-with-cached-db proc . params)
  ;; first cache the db in /tmp
  (let* ((cname-part (conc "megatest_cache/" (common:get-testsuite-name)))
	 (fname      (conc  (common:get-area-path-signature) ".db"))
	 (cache-dir  (common:get-create-writeable-dir
		      (list (conc "/tmp/" (current-user-name) "/" cname-part)
			    (conc "/tmp/" (current-user-name) "-" cname-part)
			     (conc "/tmp/" (current-user-name) "_" cname-part))))
	 (megatest-db (conc *toppath* "/megatest.db")))
    ;; (debug:print-info 0 *default-log-port* "Using cache dir " cache-dir)
    (if (not cache-dir)
	(begin
	  (debug:print 0 *default-log-port* "ERROR: Failed to find an area to write the cache db")
	  (exit 1))
	(let* ((th1      (make-thread
			  (lambda ()
			    (if (and (file-exists? megatest-db)
				     (file-write-access? megatest-db))
				(begin
				  (common:sync-to-megatest.db 'timestamps) ;; internally mutexes on *db-local-sync*
				  (debug:print-info 2 *default-log-port* "Done syncing to megatest.db"))))
			  "call-with-cached-db sync-to-megatest.db"))
	       (cache-db (db:cache-for-read-only
			  megatest-db
			  (conc cache-dir "/" fname)
			  use-last-update: #t)))
	  (thread-start! th1)
	  (apply proc cache-db params)
	  ))))

;; options:
;;
;;  'killservers  - kills all servers
;;  'dejunk       - removes junk records
;;  'adj-testids  - move test-ids into correct ranges
;;  'old2new      - sync megatest.db records to .db/{main,1,2 ...}.db
;;  'new2old      - sync .db/{main,1,2,3 ...}.db to megatest.db
;;  'closeall     - close all opened dbs
;;  'schema       - attempt to apply schema changes
;;
;;  run-ids: '(1 2 3 ...) or #f (for all)
;;
(define (db:multi-db-sync run-ids . options)
  (if (not (launch:setup))
      (debug:print 0 *default-log-port* "ERROR: not able to setup up for megatest.")
      (let* ((dbstruct (db:setup))

	;; 	 (thread-join! th))
	;;    (map
	;; 	(lambda (run-id)
	;; 	  (thread-start! 
	;; 	   (make-thread
	;; 	    (lambda ()
	;; 	      (let* ((fromdb (if toppath (make-dbr:dbstruct path: toppath local: #t) #f))
;;                    (if (member 'schema options)
	;; 		(if (eq? run-id 0)
	;; 		    (let ((maindb  (db:dbdat-get-db (db:get-db fromdb #f))))
	;; 		      (db:patch-schema-maindb run-id maindb))
	;; 		    (db:patch-schema-rundb run-id frundb)))
	;; 	      (set! count (+ count 1))
	;; 	      (debug:print 0 *default-log-port* "Finished patching schema for " (if (eq? run-id 0) " main.db " (conc run-id ".db")) ", " count " of " total)))))
	;; 	all-run-ids))

	;; 	     (thread-start! 
	;; 	      (make-thread
	;; 	       (lambda ()
	;; 		 (let* ((fromdb (if toppath (make-dbr:dbstruct path: toppath local: #t) #f))
	;; 			(frundb (db:dbdat-get-db (db:get-db fromdb run-id))))
	;; 		   (if (eq? run-id 0)
	;; 		       (let ((maindb  (db:dbdat-get-db (db:get-db fromdb #f))))
;;                             (db:sync-tables (db:sync-main-list dbstruct) #f (db:get-db fromdb #f) mtdb)
	;; 			 (set! dead-runs (db:clean-up-maindb (db:get-db fromdb #f))))
	;; 		       (begin
	;; 			 ;; NB// must sync first to ensure deleted tests get marked as such in megatest.db
;;                             (db:sync-tables db:sync-tests-only #f (db:get-db fromdb run-id) mtdb)
	;; 			 (db:clean-up-rundb (db:get-db fromdb run-id)))))
	;; 		 (set! count (+ count 1))
	;; 		 (debug:print 0 *default-log-port* "Finished clean up of "
	;; 			      (if (eq? run-id 0)
	;; 				  " main.db " (conc run-id ".db")) ", " count " of " total)))))
	;; 	   all-run-ids))))