Megatest

# 
#     You should have received a copy of the GNU General Public License
#     along with Megatest.  If not, see <http://www.gnu.org/licenses/>.

TODO
====

. Simple, fast, make-like running: megatest run <sometestname>
  would run that test, auto creating a default target and runname


Migration to inmem db plus per run db
-------------------------------------

. Re-work the dbstruct data structure?
.. Move main.db to global?

;; This is the basic setup command. Must always be
;; called before connecting to a db using connect.
;;
;; find or become the captain
;; setup and return a ulex object
;;
(define (setup #!optional (udata-in #f))
  (let* ((udata (or udata-in (make-udat)))
	 (cpkts (get-all-captain-pkts udata)) ;; read captain pkts
	 (captn (get-winning-pkt cpkts)))
    ;; check to see if our own server is started and start one if not
    (if (not (udat-serv-listener udata))(start-server-find-port udata))
    (if captn
	(let* ((port   (alist-ref 'port   captn))
	       (host   (alist-ref 'host   captn))

	 (msg    (string-intersperse dbs " "))
	 (res (send udata host-port 'ping cookie msg retval: #t))
	 (delta (- (current-milliseconds) start)))
    (values (equal? res cookie) delta)))

;; returns: success pingtime
;;
;; NOTE: causes all references to this worker to be wiped out in the
;; callee (ususally the captain)
;;
(define (goodbye-ping udata host-port)
  (let* ((start  (current-milliseconds))
	 (cookie (make-cookie udata))
	 (dbs    (udat-my-dbs udata))
	 (res (send udata host-port 'goodbye cookie "nomsg" retval: #t))
	 (delta (- (current-milliseconds) start)))

(define (get-db-owner udata dbname dbtype)
  (let* ((host-port (udat-captain-host-port udata)))
    (if host-port
	(let* ((cookie (make-cookie udata))
	       (msg    #f) ;; (conc dbname " " dbtype))
	       (params `(,dbname ,dbtype))
	       (res    (send udata host-port 'db-owner cookie msg
			     params: params retval: #t)))
	  (match (string-split res)
	    ((retcookie owner-host-port)
	     (values (equal? retcookie cookie) owner-host-port))))
	(values #f -1))))

;; called in ulex-handler to dispatch work, called on the workers side
;;     calls (proc params data)

;; send structured data to recipient
;;
;;  NOTE: qrykey is what was called the "cookie" previously
;;
;;     retval tells send to expect and wait for return data (one line) and return it or time out
;;       this is for ping where we don't want to necessarily have set up our own server yet.
;;
(define (send udata host-port handler qrykey data
	      #!key (hostname #f)(pid #f)(params '())(retval #f))
  (let* ((my-host-port (udat-my-host-port udata))
	 (isme         (equal? host-port my-host-port)) ;; am I calling
							;; myself?
	 (dat          (list
			handler              ;; " "
			my-host-port         ;; " "
			(udat-my-pid  udata) ;; " "
			qrykey
			params ;;(if (null? params) "" (conc " "
			       ;;(string-intersperse params " ")))
			)))
    ;; (print "send isme is " (if isme "true!" "false!") ",
    ;; my-host-port: " my-host-port ", host-port: " host-port)
    (if isme
	(ulex-handler udata dat data)
	(handle-exceptions ;; ERROR - MAKE THIS EXCEPTION HANDLER MORE
			   ;; SPECIFIC
	    exn
	    #f 
	  (let-values (((inp oup)(tcp-connect host-port)))
	    ;;
	    ;; CONTROL LINE:
	    ;;    handlerkey host:port pid qrykey params ...
	    ;;