Megatest

	  )

;;   ;; ulex parameters
;;   (work-method 'direct)
;;   (return-method 'direct)
  
  ;; ulex parameters
  (work-method 'mailbox)
  (return-method 'mailbox)
  
;; fake out readline usage of toplevel-command
(define (toplevel-command . a) #f)
(define *didsomething* #f)  
(define *db* #f) ;; this is only for the repl, do not use in general!!!!

;; (include "common_records.scm")

;; (tcp-buffer-size 2048)
;; (max-connections 2048) 

;; info about me as a listener and my connections to db servers
;; stored (for now) in *db-serv-info*
;;
(defstruct servdat
  (host #f)
  (port #f)
  (uuid #f)
  (dbfile #f)
  (uconn   #f) ;; this is the listener *FOR THIS PROCESS*
  (mode    #f)
  (status 'starting)
  (trynum 0) ;; count the number of ports we've tried
  (conns  (make-hash-table)) ;; apath/dbname => conndat
  ) 

(define *db-serv-info* (make-servdat))

;;
;; TODO: This is unnecessarily re-creating the record in the hash table
;;
(define (rmt:open-main-connection remdat apath)
  (let* ((fullpath (db:dbname->path apath ".db/main.db"))
	 (conns    (servdat-conns remdat))
	 (conn     (rmt:get-conn remdat apath ".db/main.db")) ;; (hash-table-ref/default conns fullpath #f)) ;; TODO - create call for this
	 (start-rmt:run (lambda ()
			  (let* ((th1 (make-thread (lambda ()(rmt:run (get-host-name))) "non-db mode server")))
			    (thread-start! th1)
			    (thread-sleep! 1)
			    (let loop ((count 0))
			      (assert (< count 30) "FATAL: responder failed to initialize in rmt:open-main-connection")
			      (if (or (not *db-serv-info*)
				      (not (servdat-uconn *db-serv-info*)))
				  (begin
				    (thread-sleep! 1)
				    (loop (+ count 1)))
				  (begin
				    (servdat-mode-set! *db-serv-info* 'non-db)
				    (servdat-uconn *db-serv-info*)))))))
	 (myconn    (servdat-uconn *db-serv-info*)))
    (cond
     ((not myconn)
      (start-rmt:run)
      (rmt:open-main-connection remdat apath))
     ((and conn                                             ;; conn is NOT a socket, just saying ...
	   (< (current-seconds) (conndat-expires conn)))
      #t) ;; we are current and good to go - we'll deal elsewhere with a server that was killed or died 
     ((and conn
	   (>= (current-seconds)(conndat-expires conn)))
      (debug:print-info 0 *default-log-port* "connection to "fullpath" server expired. Reconnecting.")
      (rmt:drop-conn remdat apath ".db/main.db") ;;

	(if (not the-srv) ;; have server, try connecting to it
	    (start-main-srv)
	    (let* ((srv-addr (server-address the-srv)) ;; need serv
		   (ipaddr   (alist-ref 'ipaddr  the-srv))
		   (port     (alist-ref 'port    the-srv))
		   (srvkey   (alist-ref 'servkey the-srv))
		   (fullpath (db:dbname->path apath dbname))
		   
		   (new-the-srv (make-conndat
				 apath:   apath
				 dbname:  dbname
				 fullname: fullpath
				 hostport: srv-addr
				 ;; socket: (open-nn-connection srv-addr)  - TODO - open ulex connection?
				 ipaddr: ipaddr

	      (debug:print-info 0 *default-log-port* "rmt:send-receive "cmd" params="params))
	  (rmt:send-receive-real sinfo apath dbname cmd params)))))

;; db is at apath/.db/dbname, rid is an intermediary solution and will be removed
;; sometime in the future
;;
(define (rmt:send-receive-real sinfo apath dbname cmd params)
  (assert (not (eq? 'primordial (thread-name (current-thread)))) "FATAL: Do not call rmt:send-receive-real in the primodial thread.")
  (let* ((cdat (rmt:get-conn sinfo apath dbname)))
    (assert cdat "FATAL: rmt:send-receive-real called without the needed channels opened")
    (let* ((uconn    (servdat-uconn sinfo)) ;; get the interface to ulex
	   ;; then send-receive using the ulex layer to host-port stored in cdat
	   (res      (send-receive uconn (conndat-hostport cdat) cmd params))
	   #;(th1      (make-thread (lambda ()
				    (set! res (send-receive uconn (conndat-hostport cdat) cmd params)))
				  "send-receive thread")))
      ;; (thread-start! th1)
      ;; (thread-join! th1)   ;; gratuitious thread stuff is so that mailbox is not used in primordial thead
      ;; since we accessed the server we can bump the expires time up
      (conndat-expires-set! cdat (+ (current-seconds)
				    (server:expiration-timeout)
				    -2)) ;; two second margin for network time misalignments etc.
      res)))

;; db is at apath/.db/dbname, rid is an intermediary solution and will be removed
;; sometime in the future.

  (hash-table-ref/default *http-functions* fnkey (lambda () "nothing here yet")))

(define *rmt:run-mutex* (make-mutex))
(define *rmt:run-flag* #f)

;; Main entry point to start a server. was start-server
(define (rmt:run hostn)

  (mutex-lock! *rmt:run-mutex*)
  (if *rmt:run-flag*
      (begin
	(debug:print-warn 0 *default-log-port* "rmt:run already running.")
	(mutex-unlock! *rmt:run-mutex*))
      (begin
	(set! *rmt:run-flag* #t)
	(mutex-unlock! *rmt:run-mutex*)
	;;  ;; Configurations for server
	;;  (tcp-buffer-size 2048)
	;;  (max-connections 2048) 
	(debug:print 2 *default-log-port* "PID: "(current-process-id)". Attempting to start the server ...")
	(if (and *db-serv-info*
		 (servdat-uconn *db-serv-info*))
	    (let* ((uconn (servdat-uconn *db-serv-info*)))
	      (wait-and-close uconn))
	    (let* ((port            (portlogger:open-run-close portlogger:find-port))
		   (handler-proc    (lambda (rem-host-port qrykey cmd params) ;;
				      (set! *db-last-access* (current-seconds))
				      (assert (list? params) "FATAL: handler called with non-list params")
				      (assert (args:get-arg "-server") "FATAL: handler called on non-server side. cmd="cmd", params="params)
				      (debug:print 0 *default-log-port* "handler call: "cmd", params="params)
				      (api:execute-requests *dbstruct-db* cmd params))))
	      ;; (api:process-request *dbstuct-db* 
	      (if (not *db-serv-info*)

	    #;(debug:print-info 0 *default-log-port* "Sending 'quit to server, received: "
			      (open-send-receive-nn (conc iface":"port)      ;; do this here and not in server-shutdown
						    (sexpr->string 'quit))))))))))

(define (rmt:get-reasonable-hostname)
  (let* ((inhost (or (args:get-arg "-server") "-")))
    (if (equal? inhost "-")
	(get-host-name)
	inhost)))

;; Call this to start the actual server
;;
;; all routes though here end in exit ...
;;
;; This is the point at which servers are started
;;
(define (rmt:server-launch dbname)

  (debug:print-info 0 *default-log-port* "Entered rmt:server-launch")
  (let* ((th2 (make-thread (lambda ()
			     (debug:print-info 0 *default-log-port* "Server run thread started")
			     (rmt:run (rmt:get-reasonable-hostname)))
			   "Server run"))
	 (th3 (make-thread (lambda ()
			     (debug:print-info 0 *default-log-port* "Server monitor thread started")
			     (if (args:get-arg "-server")
				 (rmt:keep-running dbname)))
			     "Keep running")))
    (thread-start! th2)
    (thread-sleep! 0.252) ;; give the server time to settle before starting the keep-running monitor.
    (thread-start! th3)
    (set! *didsomething* #t)
    (thread-join! th2)
    (thread-join! th3))
  #f)
	    
;; Generate a unique signature for this process, used at both client and
;; server side
(define (rmt:mk-signature)
  (message-digest-string (md5-primitive) 
			 (with-output-to-string
			   (lambda ()

	chicken.pretty-print
	commonmod
	ulex
	)

(define test-work-dir (current-directory))

(work-method   'mailbox)   ;; threads, direct, mailbox
(return-method 'mailbox)   ;; polling, mailbox, direct

;; given list of lists
;;  ( ( msg expected param1 param2 ...)
;;    ( ... ) )
;; apply test to all
;;
(define (test-batch proc pname inlst #!key (post-proc #f))

;;   See README in the distribution at https://www.kiatoa.com/fossils/ulex
;; NOTES:
;;   Why sql-de-lite and not say, dbi?  - performance mostly, then simplicity.
;;
;;======================================================================

(module ulex
    (


     
     ;; NOTE: looking for the handler proc - find the run-listener :)
     
     run-listener     ;; (run-listener handler-proc [port]) => uconn

     ;; NOTE: handler-proc params;
     ;;       (handler-proc rem-host-port qrykey cmd params)

	chicken.base
	chicken.file
	chicken.time
	chicken.condition
	chicken.string
	chicken.sort
	chicken.pretty-print

	
	address-info
	mailbox
	matchable
	;; queues
	regex
	regex-case
	s11n
	srfi-1
	srfi-18
	srfi-4
	srfi-69
	system-information
	tcp6
	typed-records


	)

;; udat struct, used by both caller and callee
;; instantiated as uconn by convention
;;
(defstruct udat
  ;; the listener side

  (cnum       0)                 ;; cookie number
  (mboxes     (make-hash-table)) ;; for the replies
  (avail-cmboxes '())            ;; list of (<cookie> . <mbox>) for re-use
  ;; threads
  (numthreads 50)
  (cmd-thread #f)
  (work-queue-thread #f)

  ) 

;; ;; struct for keeping track of others we are talking to
;; ;;
;; (defstruct pdat
;;   (host-port  #f)
;;   (conns      '()) ;; list of pcon structs, pop one off when calling the peer
;;   )
;; 
;; ;; struct for peer connections, keep track of expiration etc.
;; ;;
;; (defstruct pcon
;;   (inp #f)
;;   (oup #f)
;;   (exp (+ (current-seconds) 59)) ;; expires at this time, set to (+ (current-seconds) 59)
;;   (lifetime (+ (current-seconds) 600)) ;; throw away and create new after five minutes
;;   )

;;======================================================================
;; listener
;;======================================================================

;; is uconn a ulex connector (listener)
;;

;;  if udata-in is #f create the record
;;  if there is already a serv-listener return the udata
;;
(define (setup-listener uconn #!optional (port 4242))
  (handle-exceptions
   exn
   (if (< port 65535)



       (setup-listener uconn (+ port 1))
       #f)
   (connect-listener uconn port)))

(define (connect-listener uconn port)
  ;; (tcp-listener-socket LISTENER)(socket-name so)
  ;; sockaddr-address, sockaddr-port, sockaddr->string
  (let* ((tlsn (tcp-listen port 1000 #f)) ;; (tcp-listen TCPPORT [BACKLOG [HOST]])
	 (addr (get-my-best-address))) ;; (hostinfo-addresses (host-information (current-hostname)))
    (udat-port-set!      uconn port)
    (udat-host-port-set! uconn (conc addr":"port))
    (udat-socket-set!    uconn tlsn)
    uconn))

;; run-listener does all the work of starting a listener in a thread
;; it then returns control
;;
(define (run-listener handler-proc #!optional (port-suggestion 4242))
  (let* ((uconn (make-udat)))
    (udat-work-proc-set! uconn handler-proc)

    (if (setup-listener uconn port-suggestion)
	(let* ((th1 (make-thread (lambda ()(ulex-cmd-loop uconn)) "Ulex command loop"))
	       #;(th2 (make-thread (lambda ()(process-work-queue uconn)) "Ulex work queue processor")))
	  (tcp-buffer-size 2048)
	  ;; (max-connections 2048) 
	  (thread-start! th1)
	  #;(thread-start! th2)
	  (udat-cmd-thread-set! uconn th1)
	  #;(udat-work-queue-thread-set! uconn th2)
	  (print "cmd loop and process workers started")
	  uconn)
	(assert #f "ERROR: run-listener called without proper setup."))))

(define (wait-and-close uconn)





  (thread-join! (udat-cmd-thread uconn))
  (tcp-close (udat-socket uconn)))

;;======================================================================
;; peers and connections
;;======================================================================

(define *send-mutex* (make-mutex))

;; 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.
;;
;; NOTE: see below for beginnings of code to allow re-use of tcp connections
;;        - I believe (without substantial evidence) that re-using connections will
;;          be beneficial ...
;;
(define (send udata host-port qrykey cmd params)
  (mutex-lock! *send-mutex*)
  (let* ((my-host-port (udat-host-port udata))          ;; remote will return to this
	 (isme         #f #;(equal? host-port my-host-port)) ;; calling myself?
	 ;; dat is a self-contained work block that can be sent or handled locally
	 (dat          (list my-host-port qrykey cmd params)))



    (if isme
	(ulex-handler udata dat) ;; no transmission needed
	(handle-exceptions ;; TODO - MAKE THIS EXCEPTION CMD SPECIFIC?
	    exn
	    #f
	  (let-values (((inp oup)(tcp-connect host-port)))
	    (let ((res (if (and inp oup)
			   (begin
			     (serialize dat oup)
			     (deserialize inp)) ;; yes, we always want an ack
			   (begin
			     (print "ERROR: send called but no receiver has been setup. Please call setup first!")
			     #f))))
	      (close-input-port inp)
	      (close-output-port oup)
	      (mutex-unlock! *send-mutex*)
	      res)))))) ;; res will always be 'ack

;; send a request to the given host-port and register a mailbox in udata
;; wait for the mailbox data and return it
;;
(define (send-receive uconn host-port cmd data)
  (cond
   ((member cmd '(ping goodbye)) ;; these are immediate
    (send uconn host-port 'ping cmd data))
   (else
    (let* ((cmbox     (get-cmbox uconn)) ;; would it be better to keep a stack of mboxes to reuse?
	   (qrykey    (car cmbox))
	   (mbox      (cdr cmbox))
	   (mbox-time (current-milliseconds))
	   (sres      (send uconn host-port qrykey cmd data))) ;; short res
      sres))))

;;======================================================================
;; responder side
;;======================================================================

;; take a request, rdat, and if not immediate put it in the work queue
;;
;; Reserved cmds; ack ping goodbye response
;;
(define (ulex-handler uconn rdat)
  (assert (list? rdat) "FATAL: ulex-handler give rdat as not list")
  (match rdat ;;  (string-split controldat)
    ((rem-host-port qrykey cmd params)
     ;; (print "ulex-handler got: "rem-host-port" qrykey: "qrykey" cmd: "cmd" params: "params)
     (let ((mbox (hash-table-ref/default (udat-mboxes uconn) qrykey #f)))
       (case cmd
	 ;; ((ack )(print "Got ack! But why? Should NOT get here.") 'ack)
	 ((ping)
	  ;; (print "Got Ping!")
	  ;; (add-to-work-queue uconn rdat)
	 'ack)
	 (else
	  (do-work uconn rdat)))))
    (else
     (print "BAD DATA? controldat=" rdat)
     'ack) ;; send ack anyway?

    ))















;; given an already set up uconn start the cmd-loop
;;
(define (ulex-cmd-loop uconn)
  (let* ((serv-listener (udat-socket uconn)))

    (let loop ((state 'start))
      (let-values (((inp oup)(tcp-accept serv-listener)))
	(let* ((rdat  (deserialize inp)) ;; '(my-host-port qrykey cmd params)
	       (resp  (ulex-handler uconn rdat)))
	  (if resp (serialize resp oup))
	  (close-input-port inp)
	  (close-output-port oup))
	(loop state)))))
;;(define (ulex-cmd-loop uconn)
;;  (let* ((serv-listener (udat-socket uconn))
;;	 ;; (old-listener      (lambda ()
;;	 ;; 		      (let loop ((state 'start))
;;	 ;; 			(let-values (((inp oup)(tcp-accept serv-listener)))
;;	 ;; 			  (let* ((rdat  (deserialize inp)) ;; '(my-host-port qrykey cmd params)
;;	 ;; 				 (resp  (ulex-handler uconn rdat)))
;;	 ;; 			    (if resp (serialize resp oup))
;;	 ;; 			    (close-input-port inp)
;;	 ;; 			    (close-output-port oup))
;;	 ;; 			  (loop state)))))

;;	 (server       (make-tcp-server
;;			serv-listener
;;			(lambda ()
;;			  (let* ((rdat  (deserialize )) ;; '(my-host-port qrykey cmd params)
;;				 (resp  (ulex-handler uconn rdat)))
;;			    (if resp (serialize resp) resp))))))
;;    (server)))

;; add a proc to the cmd list, these are done symetrically (i.e. in all instances)
;; so that the proc can be dereferenced remotely
;;
(define (set-work-handler uconn proc)
  (udat-work-proc-set! uconn proc))

  #;(queue-add! (udat-work-queue uconn) rdat)
  (mailbox-send! (udat-work-queue uconn) rdat))

(define (do-work uconn rdat)
  (let* ((proc (udat-work-proc uconn))) ;; get it each time - conceivebly it could change
    ;; put this following into a do-work procedure
    (match rdat
      ((rem-host-port qrykey cmd params)
       (let* ((start-time (current-milliseconds))
	      (result (proc rem-host-port qrykey cmd params))
	      (end-time (current-milliseconds))
	      (run-time (- end-time start-time)))
	 result))
      (else
       (print "ERROR: rdat "rdat", did not match rem-host-port qrykey cmd params")
       #f))))
     
(define (process-work-queue uconn) 
  (let ((wqueue (udat-work-queue uconn))
	(proc   (udat-work-proc  uconn))
	(numthr (udat-numthreads uconn)))
    (let loop ((thnum    1)
	       (threads '()))
      (let ((thlst (cons (make-thread (lambda ()
					(let work-loop ()
					  (let ((rdat (mailbox-receive! wqueue 24000 'MBOX_TIMEOUT)))
					    (do-work uconn rdat))
					  (work-loop)))
				      (conc "work thread " thnum))
			 threads)))
	(if (< thnum numthr)
	    (loop (+ thnum 1)
		  thlst)
	    (begin
	      (print "ULEX: Starting "(length thlst)" worker threads.")
	      (map thread-start! thlst)
	      (print "ULEX: Threads started. Joining all.")
	      (map thread-join! thlst)))))))

;; below was to enable re-use of connections. This seems non-trivial so for
;; now lets open on each call
;;
;; ;; given host-port get or create peer struct
;; ;;
;; (define (udat-get-peer uconn host-port)
;;   (or (hash-table-ref/default (udat-peers uconn) host-port #f)
;;       ;; no peer, so create pdat and init it
;;       
;;       ;; NEED stack of connections, pop and use; inp, oup,
;;       ;; creation_time (remove and create new if over 24hrs old
;;       ;; 
;;       (let ((pdat (make-pdat host-port: host-port)))
;; 	(hash-table-set! (udat-peers uconn) host-port pdat)
;; 	pdat)))
;; 
;; ;; is pcon alive
;; 
;; ;; given host-port and pdat get a pcon
;; ;;
;; (define (pdat-get-pcon pdat host-port)
;;   (let loop ((conns (pdat-conns pdat)))
;;     (if (null? conns) ;; none? make and return - do NOT add - it will be pushed back on list later
;; 	(init-pcon (make-pcon))
;; 	(let* ((conn (pop conns)))
;; 	  
;; ;; given host-port get a pcon struct
;; ;;
;; (define (udat-get-pcon 
      
;;======================================================================
;; misc utils
;;======================================================================

(define (make-cookie uconn)
  (let ((newcnum (+ (udat-cnum uconn) 1)))
    (udat-cnum-set! uconn newcnum)

(define (get-all-ips-sorted)
  (sort (get-all-ips) ip-pref-less?))

(define (get-all-ips)
  (map address-info-host
       (filter (lambda (x)
		 (equal? (address-info-type x) "tcp"))
	       (address-infos (get-host-name)))))

)

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

;;======================================================================

(declare (unit ulex))

(include "ulex/ulex.scm")
;; (include "ulex-simple/ulex.scm")