Megatest

;; 
(define (dbfile:run-id->path apath run-id)
  (conc apath"/"(dbfile:run-id->dbname run-id)))

(define (db:dbname->path apath dbname)
  (conc apath"/"dbname))

;; POTENTIAL BUG: this implementation could produce a db file if run-id is neither #f or a number
(define (dbfile:run-id->dbname run-id)
  (cond
   ((number? run-id) (conc ".megatest/" (modulo run-id 100) ".db"))
   ((not run-id)     (conc ".megatest/main.db"))
   (else             run-id)))

;; Make the dbstruct, setup up auxillary db's and call for main db at least once

	#f
	(begin
	  (set! *dbfile:num-handles-in-use* (+ *dbfile:num-handles-in-use* 1))
	  (stack-pop! (dbr:subdb-dbstack subdb))))))

;; return a previously opened db handle to the stack of available handles
(define (dbfile:add-dbdat dbstruct run-id dbdat)
  (let* ((subdb (dbfile:get-subdb dbstruct run-id))
  (let* ((subdb (dbfile:get-subdb dbstruct run-id)))
	 (age   (- (current-seconds)(dbr:dbdat-birth-sec dbdat))))
    (if #f ;; (> age 300) ;; just testing - discard and close after 30 sec
	(begin
	  ;; (map sqlite3:finalize! (hash-table-values (dbr:dbdat-stmt-cache dbdat)))
	  ;; (sqlite3:finalize! (dbr:dbdat-dbh dbdat))
	  (dbfile:print-err "INFO: Discarded dbdat over 30 sec old ("age"s)"))
	(begin
	  (set! *dbfile:num-handles-in-use* (- *dbfile:num-handles-in-use* 1))
	  (stack-push! (dbr:subdb-dbstack subdb) dbdat)))))
        (set! *dbfile:num-handles-in-use* (- *dbfile:num-handles-in-use* 1))
	(stack-push! (dbr:subdb-dbstack subdb) dbdat)))

;; set up a subdb
;;
(define (dbfile:init-subdb dbstruct run-id init-proc)
  (let* ((dbname    (dbfile:run-id->dbname run-id))
	 (areapath  (dbr:dbstruct-areapath dbstruct))
	 (tmppath   (dbr:dbstruct-tmppath  dbstruct))

;;

;; this stuff is for initial debugging, please remove it when
;; this code stabilizes
(define *dbopens* (make-hash-table))
(define (dbfile:inc-db-open dbfile)
  (let* ((curr-opens-count (+ (hash-table-ref/default *dbopens* dbfile 0) 1)))
    (if (> curr-opens-count 1) ;; this should NOT be happening
	(dbfile:print-err "INFO: db "dbfile" has been opened "curr-opens-count" times!"))
    ;; (if (> curr-opens-count 1) ;; this should NOT be happening
	;; (dbfile:print-err "INFO: db "dbfile" has been opened "curr-opens-count" times!"))
    (hash-table-set! *dbopens* dbfile curr-opens-count)
    curr-opens-count))

;; Open the classic megatest.db file (defaults to open in toppath)
;;
;;   NOTE: returns a dbdat not a dbstruct!
;;

			    (if (not db-exists)
				(begin
				  (sqlite3:execute db "CREATE TABLE IF NOT EXISTS no_sync_metadat (var TEXT,val TEXT, CONSTRAINT no_sync_metadat_constraint UNIQUE (var));"))
				)))
	       (db        (dbfile:cautious-open-database dbname init-proc))) ;; (sqlite3:open-database dbname)))
	  (sqlite3:execute db "PRAGMA synchronous = 0;")
	  (sqlite3:set-busy-handler! db (sqlite3:make-busy-timeout 136000))
	  ;;(sqlite3:execute db "PRAGMA journal_mode=WAL;")
	  (set! *no-sync-db* db)
	  db))))

(define (db:no-sync-set db var val)
  (sqlite3:execute db "INSERT OR REPLACE INTO no_sync_metadat (var,val) VALUES (?,?);" var val))

(define (db:no-sync-del! db var)

	 #;(subdb     (if have-struct
			(dbfile:get-subdb dbstruct run-id)
			#f))
	 (use-mutex (> *api-process-request-count* 25))) ;; was 25
    (if (and use-mutex
	     (common:low-noise-print 120 "over-50-parallel-api-requests"))
	(dbfile:print-err *api-process-request-count* " parallel api requests being processed in process " (current-process-id) ", throttling access"))
    #;(if (common:low-noise-print 600 (conc "parallel-api-requests" *max-api-process-requests*))
	(dbfile:print-err "Parallel api request count: " *api-process-request-count* " max parallel requests: " *max-api-process-requests*))
    (condition-case
	(begin
	  (if use-mutex (mutex-lock! *db-with-db-mutex*))
	  (let ((res (apply proc dbdat db params)))
	    (if use-mutex (mutex-unlock! *db-with-db-mutex*))
	    ;; (if (vector? dbstruct)(db:done-with dbstruct run-id r/w))
	    (if dbdat