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;;======================================================================
;; Copyright 2006-2017, Matthew Welland.
;; 
;;  This program is made available under the GNU GPL version 2.0 or
;;  greater. See the accompanying file COPYING for details.




;; 

;;  This program is distributed WITHOUT ANY WARRANTY; without even the
;;  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR

;;  PURPOSE.



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

(use format typed-records) ;; RADT => purpose of json format??

(declare (unit rmt))
(declare (uses api))
(declare (uses tdb))
(declare (uses http-transport))
;;(declare (uses nmsg-transport))
(include "common_records.scm")

;;
;; THESE ARE ALL CALLED ON THE CLIENT SIDE!!!
;;

;; generate entries for ~/.megatestrc with the following




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;;======================================================================
;; Copyright 2006-2017, Matthew Welland.
;; 
;; This file is part of Megatest.
;; 
;;     Megatest is free software: you can redistribute it and/or modify
;;     it under the terms of the GNU General Public License as published by
;;     the Free Software Foundation, either version 3 of the License, or
;;     (at your option) any later version.
;; 
;;     Megatest is distributed in the hope that it will be useful,
;;     but WITHOUT ANY WARRANTY; without even the implied warranty of
;;     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;     GNU General Public License for more details.
;; 
;;     You should have received a copy of the GNU General Public License
;;     along with Megatest.  If not, see <http://www.gnu.org/licenses/>.
;;
;;======================================================================

(use format typed-records) ;; RADT => purpose of json format??

(declare (unit rmt))
(declare (uses api))

(declare (uses http-transport))

(include "common_records.scm")

;;
;; THESE ARE ALL CALLED ON THE CLIENT SIDE!!!
;;

;; generate entries for ~/.megatestrc with the following
︙︙
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(define *send-receive-mutex* (make-mutex)) ;; should have separate mutex per run-id

;; RA => e.g. usage (rmt:send-receive 'get-var #f (list varname))
;;
(define (rmt:send-receive cmd rid params #!key (attemptnum 1)(area-dat #f)) ;; start attemptnum at 1 so the modulo below works as expected







  ;; do all the prep locked under the rmt-mutex
  (mutex-lock! *rmt-mutex*)

  ;; 1. check if server is started IFF cmd is a write OR if we are not on the homehost, store in runremote
  ;; 2. check the age of the connections. refresh the connection if it is older than timeout-20 seconds.
  ;; 3. do the query, if on homehost use local access
  ;;
  (let* ((start-time    (current-seconds)) ;; snapshot time so all use cases get same value
         (areapath      *toppath*);; TODO - resolve from dbstruct to be compatible with multiple areas
	 (runremote     (or area-dat
			    *runremote*))
	 (readonly-mode (if (and runremote
				 (remote-ro-mode-checked runremote))
			    (remote-ro-mode runremote)
			    (let* ((dbfile  (conc *toppath* "/megatest.db"))
				   (ro-mode (not (file-write-access? dbfile)))) ;; TODO: use dbstruct or runremote to figure this out in future
			      (if runremote
				  (begin
				    (remote-ro-mode-set! runremote ro-mode)
				    (remote-ro-mode-checked-set! runremote #t)
				    ro-mode)
				  ro-mode)))))




     ;; ensure we have a record for our connection for given area
     (if (not runremote)                   ;; can remove this one. should never get here.         
	 (begin
	   (set! *runremote* (make-remote))
	   (set! runremote   *runremote*))) ;; new runremote will come from this on next iteration




     ;; ensure we have a homehost record
     (if (not (pair? (remote-hh-dat runremote)))  ;; not on homehost
	 (thread-sleep! 0.1) ;; since we shouldn't get here, delay a little
	 (remote-hh-dat-set! runremote (common:get-homehost)))

     ;;(print "BB> readonly-mode is "readonly-mode" dbfile is "dbfile)
    (cond


     ;; give up if more than 15 attempts
     ((> attemptnum 15)
      (debug:print 0 *default-log-port* "ERROR: 15 tries to start/connect to server. Giving up.")
      (exit 1))




     ;; readonly mode, read request-  handle it - case 20
     ((and readonly-mode
           (member cmd api:read-only-queries)) 
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case 20")
      (rmt:open-qry-close-locally cmd 0 params)
      )




     ;; readonly mode, write request.  Do nothing, return #f
     (readonly-mode
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case 21")
      (debug:print 0 *default-log-port* "WARNING: write transaction requested on a readonly area.  cmd="cmd" params="params)
      #f
      )







     ;; reset the connection if it has been unused too long
     ((and runremote
           (remote-conndat runremote)
	   (let ((expire-time (+ (- start-time (remote-server-timeout runremote))(random 10)))) ;; Subtract or add the random value? Seems like it should be substract but Neither fixes the "WARNING: failure in with-input-from-request to #<request>.\n message: Server closed connection before sending response"
	     (< (http-transport:server-dat-get-last-access (remote-conndat runremote)) expire-time)))

      (debug:print-info 0 *default-log-port* "Connection to " (remote-server-url runremote) " expired due to no accesses, forcing new connection.")

      (remote-conndat-set! runremote #f) ;; invalidate the connection, thus forcing a new connection.
      (mutex-unlock! *rmt-mutex*)
      (rmt:send-receive cmd rid params attemptnum: attemptnum))





     ;; on homehost and this is a read
     ((and (not (remote-force-server runremote))      ;; honor forced use of server
	   (cdr (remote-hh-dat runremote))     ;; on homehost
           (member cmd api:read-only-queries)) ;; this is a read
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  3")
      (rmt:open-qry-close-locally cmd 0 params))




     ;; on homehost and this is a write, we already have a server, but server has died
     ((and (cdr (remote-hh-dat runremote))           ;; on homehost
           (not (member cmd api:read-only-queries))  ;; this is a write
           (remote-server-url runremote)             ;; have a server
           (not (server:ping (remote-server-url runremote))))  ;; server has died. NOTE: this is not a cheap call! Need better approach.
      (set! *runremote* (make-remote))

      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  4.1")
      (rmt:send-receive cmd rid params attemptnum: attemptnum))




     ;; on homehost and this is a write, we already have a server
     ((and (not (remote-force-server runremote))     ;; honor forced use of server
	   (cdr (remote-hh-dat runremote))           ;; on homehost
           (not (member cmd api:read-only-queries))  ;; this is a write
           (remote-server-url runremote))            ;; have a server
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  4")
      (rmt:open-qry-close-locally cmd 0 params))




     ;;  on homehost, no server contact made and this is a write, passively start a server 
     ((and (not (remote-force-server runremote)) ;; honor forced use of server
	   (cdr (remote-hh-dat runremote))       ;; new
           (not (remote-server-url runremote))
	   (not (member cmd api:read-only-queries)))
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  5")
      (let ((server-url  (server:check-if-running *toppath*))) ;; (server:read-dotserver->url *toppath*))) ;; (server:check-if-running *toppath*))) ;; Do NOT want to run server:check-if-running - very expensive to do for every write call
	(if server-url
	    (remote-server-url-set! runremote server-url) ;; the string can be consumed by the client setup if needed
	    (if (common:force-server?)
		(server:start-and-wait *toppath*)
		(server:kind-run *toppath*))))
      (remote-force-server-set! runremote (common:force-server?))
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  5.1")
      (rmt:open-qry-close-locally cmd 0 params))




     ((or (and (remote-force-server runremote)              ;; we are forcing a server and don't yet have a connection to one
	       (not (remote-conndat runremote)))
	  (and (not (cdr (remote-hh-dat runremote)))        ;; not on a homehost 
	       (not (remote-conndat runremote))))           ;; and no connection
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  6  hh-dat: " (remote-hh-dat runremote) " conndat: " (remote-conndat runremote))
      (mutex-unlock! *rmt-mutex*)
      (if (not (server:check-if-running *toppath*)) ;; who knows, maybe one has started up?
	  (server:start-and-wait *toppath*))
      (remote-force-server-set! runremote (common:force-server?))
      (remote-conndat-set! runremote (rmt:get-connection-info *toppath*)) ;; calls client:setup which calls client:setup-http
      (rmt:send-receive cmd rid params attemptnum: attemptnum)) ;; TODO: add back-off timeout as




     ;; all set up if get this far, dispatch the query
     ((and (not (remote-force-server runremote))
	   (cdr (remote-hh-dat runremote))) ;; we are on homehost
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  7")
      (rmt:open-qry-close-locally cmd (if rid rid 0) params))





     ;; not on homehost, do server query
     (else
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  9")
      (mutex-lock! *rmt-mutex*)
      (let* ((conninfo (remote-conndat runremote))
	     (dat      (case (remote-transport runremote)
			 ((http) (condition-case ;; handling here has caused a lot of problems. However it is needed to deal with attemtped communication to servers that have gone away
                                  (http-transport:client-api-send-receive 0 conninfo cmd params)
                                  ((commfail)(vector #f "communications fail"))
                                  ((exn)(vector #f "other fail" (print-call-chain)))))
			 (else
			  (debug:print 0 *default-log-port* "ERROR: transport " (remote-transport runremote) " not supported")
			  (exit))))
	     (success  (if (vector? dat) (vector-ref dat 0) #f))
	     (res      (if (vector? dat) (vector-ref dat 1) #f)))

	(if (vector? conninfo)(http-transport:server-dat-update-last-access conninfo)) ;; refresh access time





	;; (mutex-unlock! *rmt-mutex*)
        (debug:print-info 13 *default-log-port* "rmt:send-receive, case  9. conninfo=" conninfo " dat=" dat " runremote = " runremote)
	(mutex-unlock! *rmt-mutex*)
	(if success ;; success only tells us that the transport was successful, have to examine the data to see if there was a detected issue at the other end
	    (if (and (vector? res)
		     (eq? (vector-length res) 2)
		     (eq? (vector-ref res 1) 'overloaded)) ;; since we are looking at the data to carry the error we'll use a fairly obtuse combo to minimise the chances of some sort of collision.


		(let ((wait-delay (+ attemptnum (* attemptnum 10))))
		  (debug:print 0 *default-log-port* "WARNING: server is overloaded. Delaying " wait-delay " seconds and trying call again.")
		  (mutex-lock! *rmt-mutex*)

		  (set! *runremote* #f) ;; force starting over
		  (mutex-unlock! *rmt-mutex*)
		  (thread-sleep! wait-delay)
		  (rmt:send-receive cmd rid params attemptnum: (+ attemptnum 1)))
		res) ;; All good, return res
	    (begin
	      (debug:print 0 *default-log-port* "WARNING: communication failed. Trying again, try num: " attemptnum)

	      (remote-conndat-set!    runremote #f)

	      (remote-server-url-set! runremote #f)

	      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  9.1")
	      (if (not (server:check-if-running *toppath*))
		  (server:start-and-wait *toppath*))
	      (rmt:send-receive cmd rid params attemptnum: (+ attemptnum 1)))))))))



;; (define (rmt:update-db-stats run-id rawcmd params duration)
;;   (mutex-lock! *db-stats-mutex*)
;;   (handle-exceptions
;;    exn
;;    (begin
;;      (debug:print 0 *default-log-port* "WARNING: stats collection failed in update-db-stats")
;;      (debug:print 0 *default-log-port* " message: " ((condition-property-accessor 'exn 'message) exn))








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(define *send-receive-mutex* (make-mutex)) ;; should have separate mutex per run-id

;; RA => e.g. usage (rmt:send-receive 'get-var #f (list varname))
;;
(define (rmt:send-receive cmd rid params #!key (attemptnum 1)(area-dat #f)) ;; start attemptnum at 1 so the modulo below works as expected

  ;;DOT digraph megatest_state_status {
  ;;DOT   ranksep=0;
  ;;DOT   // rankdir=LR;
  ;;DOT   node [shape="box"];
  ;;DOT "rmt:send-receive" -> MUTEXLOCK;
  ;;DOT { edge [style=invis];"case 1" -> "case 2" -> "case 3" -> "case 4" -> "case 5" -> "case 6" -> "case 7" -> "case 8" -> "case 9" -> "case 10" -> "case 11"; }
  ;; do all the prep locked under the rmt-mutex
  (mutex-lock! *rmt-mutex*)
  
  ;; 1. check if server is started IFF cmd is a write OR if we are not on the homehost, store in runremote
  ;; 2. check the age of the connections. refresh the connection if it is older than timeout-20 seconds.
  ;; 3. do the query, if on homehost use local access
  ;;
  (let* ((start-time    (current-seconds)) ;; snapshot time so all use cases get same value
         (areapath      *toppath*);; TODO - resolve from dbstruct to be compatible with multiple areas
	 (runremote     (or area-dat
			    *runremote*))
	 (readonly-mode (if (and runremote
				 (remote-ro-mode-checked runremote))
			    (remote-ro-mode runremote)
			    (let* ((dbfile  (conc *toppath* "/megatest.db"))
				   (ro-mode (not (file-write-access? dbfile)))) ;; TODO: use dbstruct or runremote to figure this out in future
			      (if runremote
				  (begin
				    (remote-ro-mode-set! runremote ro-mode)
				    (remote-ro-mode-checked-set! runremote #t)
				    ro-mode)
				  ro-mode)))))

    ;; DOT INIT_RUNREMOTE; // leaving off - doesn't really add to the clarity
    ;; DOT MUTEXLOCK -> INIT_RUNREMOTE [label="no remote?"];
    ;; DOT INIT_RUNREMOTE -> MUTEXLOCK;
    ;; ensure we have a record for our connection for given area
    (if (not runremote)                   ;; can remove this one. should never get here.         
	(begin
	  (set! *runremote* (make-remote))
	  (set! runremote   *runremote*))) ;; new runremote will come from this on next iteration
    
    ;; DOT SET_HOMEHOST; // leaving off - doesn't really add to the clarity
    ;; DOT MUTEXLOCK -> SET_HOMEHOST [label="no homehost?"];
    ;; DOT SET_HOMEHOST -> MUTEXLOCK;
    ;; ensure we have a homehost record
    (if (not (pair? (remote-hh-dat runremote)))  ;; not on homehost
	(thread-sleep! 0.1) ;; since we shouldn't get here, delay a little
	(remote-hh-dat-set! runremote (common:get-homehost)))
    
    ;;(print "BB> readonly-mode is "readonly-mode" dbfile is "dbfile)
    (cond
     ;;DOT EXIT;
     ;;DOT MUTEXLOCK -> EXIT [label="> 15 attempts"]; {rank=same "case 1" "EXIT" }
     ;; give up if more than 15 attempts
     ((> attemptnum 15)
      (debug:print 0 *default-log-port* "ERROR: 15 tries to start/connect to server. Giving up.")
      (exit 1))

     ;;DOT CASE2 [label="local\nreadonly\nquery"];
     ;;DOT MUTEXLOCK -> CASE2; {rank=same "case 2" CASE2}
     ;;DOT CASE2 -> "rmt:open-qry-close-locally";
     ;; readonly mode, read request-  handle it - case 2
     ((and readonly-mode
           (member cmd api:read-only-queries)) 
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case 2")
      (rmt:open-qry-close-locally cmd 0 params)
      )

     ;;DOT CASE3 [label="write in\nread-only mode"];
     ;;DOT MUTEXLOCK -> CASE3 [label="readonly\nmode?"]; {rank=same "case 3" CASE3}
     ;;DOT CASE3 -> "#f";
     ;; readonly mode, write request.  Do nothing, return #f
     (readonly-mode
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case 3")
      (debug:print 0 *default-log-port* "WARNING: write transaction requested on a readonly area.  cmd="cmd" params="params)
      #f)

     ;; This block was for pre-emptively resetting the connection if there had been no communication for some time.
     ;; I don't think it adds any value. If the server is not there, just fail and start a new connection.
     ;; also, the expire-time calculation might not be correct. We want, time-since-last-server-access > (server:get-timeout)
     ;;
     ;;DOT CASE4 [label="reset\nconnection"];
     ;;DOT MUTEXLOCK -> CASE4 [label="have connection,\nlast_access > expire_time"]; {rank=same "case 4" CASE4}
     ;;DOT CASE4 -> "rmt:send-receive";
     ;; reset the connection if it has been unused too long
     ((and runremote
           (remote-conndat runremote)
	   (> (current-seconds) ;; if it has been more than server-timeout seconds since last contact, close this connection and start a new on
	      (+ (http-transport:server-dat-get-last-access (remote-conndat runremote))
		 (remote-server-timeout runremote))))
      (debug:print-info 0 *default-log-port* "Connection to " (remote-server-url runremote) " expired due to no accesses, forcing new connection.")
      (http-transport:close-connections area-dat: runremote)
      (remote-conndat-set! runremote #f) ;; invalidate the connection, thus forcing a new connection.
      (mutex-unlock! *rmt-mutex*)
      (rmt:send-receive cmd rid params attemptnum: attemptnum))
     
     ;;DOT CASE5 [label="local\nread"];
     ;;DOT MUTEXLOCK -> CASE5 [label="server not required,\non homehost,\nread-only query"]; {rank=same "case 5" CASE5};
     ;;DOT CASE5 -> "rmt:open-qry-close-locally";

     ;; on homehost and this is a read
     ((and (not (remote-force-server runremote)) ;; honor forced use of server, i.e. server NOT required
	   (cdr (remote-hh-dat runremote))       ;; on homehost
           (member cmd api:read-only-queries))   ;; this is a read
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  5")
      (rmt:open-qry-close-locally cmd 0 params))

     ;;DOT CASE6 [label="init\nremote"];
     ;;DOT MUTEXLOCK -> CASE6 [label="on homehost,\nwrite query,\nhave server,\ncan't reach it"]; {rank=same "case 6" CASE6};
     ;;DOT CASE6 -> "rmt:send-receive";
     ;; on homehost and this is a write, we already have a server, but server has died
     ((and (cdr (remote-hh-dat runremote))           ;; on homehost
           (not (member cmd api:read-only-queries))  ;; this is a write
           (remote-server-url runremote)             ;; have a server
           (not (server:ping (remote-server-url runremote))))  ;; server has died. NOTE: this is not a cheap call! Need better approach.
      (set! *runremote* (make-remote))
      (remote-force-server-set! runremote (common:force-server?))
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  6")
      (rmt:send-receive cmd rid params attemptnum: attemptnum))

     ;;DOT CASE7 [label="homehost\nwrite"];
     ;;DOT MUTEXLOCK -> CASE7 [label="server not required,\non homehost,\na write,\nhave a server"]; {rank=same "case 7" CASE7};
     ;;DOT CASE7 -> "rmt:open-qry-close-locally";
     ;; on homehost and this is a write, we already have a server
     ((and (not (remote-force-server runremote))     ;; honor forced use of server, i.e. server NOT required
	   (cdr (remote-hh-dat runremote))           ;; on homehost
           (not (member cmd api:read-only-queries))  ;; this is a write
           (remote-server-url runremote))            ;; have a server
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  4.1")
      (rmt:open-qry-close-locally cmd 0 params))

     ;;DOT CASE8 [label="force\nserver"];
     ;;DOT MUTEXLOCK -> CASE8 [label="server not required,\nhave homehost info,\nno connection yet,\nnot a read-only query"]; {rank=same "case 8" CASE8};
     ;;DOT CASE8 -> "rmt:open-qry-close-locally";
     ;;  on homehost, no server contact made and this is a write, passively start a server 
     ((and (not (remote-force-server runremote))     ;; honor forced use of server, i.e. server NOT required
	   (cdr (remote-hh-dat runremote))           ;; have homehost
           (not (remote-server-url runremote))       ;; no connection yet
	   (not (member cmd api:read-only-queries))) ;; not a read-only query
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  8")
      (let ((server-url  (server:check-if-running *toppath*))) ;; (server:read-dotserver->url *toppath*))) ;; (server:check-if-running *toppath*))) ;; Do NOT want to run server:check-if-running - very expensive to do for every write call
	(if server-url
	    (remote-server-url-set! runremote server-url) ;; the string can be consumed by the client setup if needed
	    (if (common:force-server?)
		(server:start-and-wait *toppath*)
		(server:kind-run *toppath*))))
      (remote-force-server-set! runremote (common:force-server?))
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  8.1")
      (rmt:open-qry-close-locally cmd 0 params))

     ;;DOT CASE9 [label="force server\nnot on homehost"];
     ;;DOT MUTEXLOCK -> CASE9 [label="no connection\nand either require server\nor not on homehost"]; {rank=same "case 9" CASE9};
     ;;DOT CASE9 -> "start\nserver" -> "rmt:send-receive";
     ((or (and (remote-force-server runremote)              ;; we are forcing a server and don't yet have a connection to one
	       (not (remote-conndat runremote)))
	  (and (not (cdr (remote-hh-dat runremote)))        ;; not on a homehost 
	       (not (remote-conndat runremote))))           ;; and no connection
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case 9, hh-dat: " (remote-hh-dat runremote) " conndat: " (remote-conndat runremote))
      (mutex-unlock! *rmt-mutex*)
      (if (not (server:check-if-running *toppath*)) ;; who knows, maybe one has started up?
	  (server:start-and-wait *toppath*))

      (remote-conndat-set! runremote (rmt:get-connection-info *toppath*)) ;; calls client:setup which calls client:setup-http
      (rmt:send-receive cmd rid params attemptnum: attemptnum)) ;; TODO: add back-off timeout as

     ;;DOT CASE10 [label="on homehost"];
     ;;DOT MUTEXLOCK -> CASE10 [label="server not required,\non homehost"]; {rank=same "case 10" CASE10};
     ;;DOT CASE10 -> "rmt:open-qry-close-locally";
     ;; all set up if get this far, dispatch the query
     ((and (not (remote-force-server runremote))
	   (cdr (remote-hh-dat runremote))) ;; we are on homehost
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case 10")
      (rmt:open-qry-close-locally cmd (if rid rid 0) params))

     ;;DOT CASE11 [label="send_receive"];
     ;;DOT MUTEXLOCK -> CASE11 [label="else"]; {rank=same "case 11" CASE11};
     ;;DOT CASE11 -> "rmt:send-receive" [label="call failed"];
     ;;DOT CASE11 -> "RESULT" [label="call succeeded"];
     ;; not on homehost, do server query
     (else
      ;; (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  9")
      ;; (mutex-lock! *rmt-mutex*)
      (let* ((conninfo (remote-conndat runremote))
	     (dat      (case (remote-transport runremote)
			 ((http) (condition-case ;; handling here has caused a lot of problems. However it is needed to deal with attemtped communication to servers that have gone away
                                  (http-transport:client-api-send-receive 0 conninfo cmd params)
                                  ((commfail)(vector #f "communications fail"))
                                  ((exn)(vector #f "other fail" (print-call-chain)))))
			 (else
			  (debug:print 0 *default-log-port* "ERROR: transport " (remote-transport runremote) " not supported")
			  (exit))))
	     (success  (if (vector? dat) (vector-ref dat 0) #f))
	     (res      (if (vector? dat) (vector-ref dat 1) #f)))
	(if (and (vector? conninfo) (< 5 (vector-length conninfo)))
            (http-transport:server-dat-update-last-access conninfo) ;; refresh access time
	    (begin
              (debug:print 0 *default-log-port* "INFO: Should not get here! conninfo=" conninfo)
              (set! conninfo #f)
              (remote-conndat-set! *runremote* #f)
              (http-transport:close-connections  area-dat: runremote)))
	;; (mutex-unlock! *rmt-mutex*)
        (debug:print-info 13 *default-log-port* "rmt:send-receive, case  9. conninfo=" conninfo " dat=" dat " runremote = " runremote)
	(mutex-unlock! *rmt-mutex*)
	(if success ;; success only tells us that the transport was successful, have to examine the data to see if there was a detected issue at the other end
	    (if (and (vector? res)
		     (eq? (vector-length res) 2)
		     (eq? (vector-ref res 1) 'overloaded)) ;; since we are looking at the data to carry the error we'll use a fairly obtuse combo to minimise the chances of some sort of collision.
                ;; this is the case where the returned data is bad or the server is overloaded and we want
                ;; to ease off the queries
		(let ((wait-delay (+ attemptnum (* attemptnum 10))))
		  (debug:print 0 *default-log-port* "WARNING: server is overloaded. Delaying " wait-delay " seconds and trying call again.")
		  (mutex-lock! *rmt-mutex*)
		  (http-transport:close-connections area-dat: runremote)
		  (set! *runremote* #f) ;; force starting over
		  (mutex-unlock! *rmt-mutex*)
		  (thread-sleep! wait-delay)
		  (rmt:send-receive cmd rid params attemptnum: (+ attemptnum 1)))
		res) ;; All good, return res
	    (begin
	      (debug:print 0 *default-log-port* "WARNING: communication failed. Trying again, try num: " attemptnum)
	      (mutex-lock! *rmt-mutex*)
              (remote-conndat-set!    runremote #f)
	      (http-transport:close-connections area-dat: runremote)
	      (remote-server-url-set! runremote #f)
	      (mutex-unlock! *rmt-mutex*)
              (debug:print-info 12 *default-log-port* "rmt:send-receive, case  9.1")
	      ;; (if (not (server:check-if-running *toppath*))
	      ;; 	  (server:start-and-wait *toppath*))
	      (rmt:send-receive cmd rid params attemptnum: (+ attemptnum 1)))))))))

    ;;DOT }
    
;; (define (rmt:update-db-stats run-id rawcmd params duration)
;;   (mutex-lock! *db-stats-mutex*)
;;   (handle-exceptions
;;    exn
;;    (begin
;;      (debug:print 0 *default-log-port* "WARNING: stats collection failed in update-db-stats")
;;      (debug:print 0 *default-log-port* " message: " ((condition-property-accessor 'exn 'message) exn))
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			     (loop (car tal)(cdr tal) newmax-cmd currmax)))))))
    (mutex-unlock! *db-stats-mutex*)
    res))

(define (rmt:open-qry-close-locally cmd run-id params #!key (remretries 5))
  (let* ((qry-is-write   (not (member cmd api:read-only-queries)))
	 (db-file-path   (db:dbfile-path)) ;;  0))
	 (dbstruct-local (db:setup))  ;; make-dbr:dbstruct path:  dbdir local: #t)))
	 (read-only      (not (file-write-access? db-file-path)))
	 (start          (current-milliseconds))
	 (resdat         (if (not (and read-only qry-is-write))
			     (let ((v (api:execute-requests dbstruct-local (vector (symbol->string cmd) params))))
			       (handle-exceptions ;; there has been a long history of receiving strange errors from values returned by the client when things go wrong..
				exn               ;;  This is an attempt to detect that situation and recover gracefully
				(begin








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			     (loop (car tal)(cdr tal) newmax-cmd currmax)))))))
    (mutex-unlock! *db-stats-mutex*)
    res))

(define (rmt:open-qry-close-locally cmd run-id params #!key (remretries 5))
  (let* ((qry-is-write   (not (member cmd api:read-only-queries)))
	 (db-file-path   (db:dbfile-path)) ;;  0))
	 (dbstruct-local (db:setup #t))  ;; make-dbr:dbstruct path:  dbdir local: #t)))
	 (read-only      (not (file-write-access? db-file-path)))
	 (start          (current-milliseconds))
	 (resdat         (if (not (and read-only qry-is-write))
			     (let ((v (api:execute-requests dbstruct-local (vector (symbol->string cmd) params))))
			       (handle-exceptions ;; there has been a long history of receiving strange errors from values returned by the client when things go wrong..
				exn               ;;  This is an attempt to detect that situation and recover gracefully
				(begin
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        res)))

(define (rmt:get-targets)
  (rmt:send-receive 'get-targets #f '()))

(define (rmt:get-target run-id)
  (rmt:send-receive 'get-target run-id (list run-id)))





;;======================================================================
;;  T E S T S
;;======================================================================

;; Just some syntatic sugar
(define (rmt:register-test run-id test-name item-path)








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        res)))

(define (rmt:get-targets)
  (rmt:send-receive 'get-targets #f '()))

(define (rmt:get-target run-id)
  (rmt:send-receive 'get-target run-id (list run-id)))

(define (rmt:get-run-times runpatt targetpatt)
  (rmt:send-receive 'get-run-times #f (list runpatt targetpatt ))) 


;;======================================================================
;;  T E S T S
;;======================================================================

;; Just some syntatic sugar
(define (rmt:register-test run-id test-name item-path)
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(define (rmt:test-set-state-status-by-id run-id test-id newstate newstatus newcomment)
  (rmt:send-receive 'test-set-state-status-by-id run-id (list run-id test-id newstate newstatus newcomment)))

(define (rmt:set-tests-state-status run-id                      testnames currstate currstatus newstate newstatus)
  (rmt:send-receive 'set-tests-state-status run-id (list run-id testnames currstate currstatus newstate newstatus)))

(define (rmt:get-tests-for-run run-id testpatt states statuses offset limit not-in sort-by sort-order qryvals last-update mode)
  (if (number? run-id)
      (rmt:send-receive 'get-tests-for-run run-id (list run-id testpatt states statuses offset limit not-in sort-by sort-order qryvals last-update mode))
      (begin
	(debug:print-error 0 *default-log-port* "rmt:get-tests-for-run called with bad run-id=" run-id)
	(print-call-chain (current-error-port))
	'())))

;; get stuff via synchash 
(define (rmt:synchash-get run-id proc synckey keynum params)
  (rmt:send-receive 'synchash-get run-id (list run-id proc synckey keynum params)))




;; IDEA: Threadify these - they spend a lot of time waiting ...
;;
(define (rmt:get-tests-for-runs-mindata run-ids testpatt states status not-in)
  (let ((multi-run-mutex (make-mutex))
	(run-id-list (if run-ids
			 run-ids
			 (rmt:get-all-run-ids)))








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(define (rmt:test-set-state-status-by-id run-id test-id newstate newstatus newcomment)
  (rmt:send-receive 'test-set-state-status-by-id run-id (list run-id test-id newstate newstatus newcomment)))

(define (rmt:set-tests-state-status run-id                      testnames currstate currstatus newstate newstatus)
  (rmt:send-receive 'set-tests-state-status run-id (list run-id testnames currstate currstatus newstate newstatus)))

(define (rmt:get-tests-for-run run-id testpatt states statuses offset limit not-in sort-by sort-order qryvals last-update mode)
  ;; (if (number? run-id)
  (rmt:send-receive 'get-tests-for-run run-id (list run-id testpatt states statuses offset limit not-in sort-by sort-order qryvals last-update mode)))
  ;;    (begin
  ;;	(debug:print-error 0 *default-log-port* "rmt:get-tests-for-run called with bad run-id=" run-id)
  ;;	(print-call-chain (current-error-port))
  ;;	'())))

;; get stuff via synchash 
(define (rmt:synchash-get run-id proc synckey keynum params)
  (rmt:send-receive 'synchash-get run-id (list run-id proc synckey keynum params)))

(define (rmt:get-tests-for-run-mindata run-id testpatt states status not-in)
  (rmt:send-receive 'get-tests-for-run-mindata run-id (list run-id testpatt states status not-in)))
  
;; IDEA: Threadify these - they spend a lot of time waiting ...
;;
(define (rmt:get-tests-for-runs-mindata run-ids testpatt states status not-in)
  (let ((multi-run-mutex (make-mutex))
	(run-id-list (if run-ids
			 run-ids
			 (rmt:get-all-run-ids)))
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(define (rmt:top-test-set-per-pf-counts run-id test-name)
  (rmt:send-receive 'top-test-set-per-pf-counts run-id (list run-id test-name)))

(define (rmt:get-raw-run-stats run-id)
  (rmt:send-receive 'get-raw-run-stats run-id (list run-id)))




;;======================================================================
;;  R U N S
;;======================================================================

(define (rmt:get-run-info run-id)
  (rmt:send-receive 'get-run-info run-id (list run-id)))

(define (rmt:get-num-runs runpatt)
  (rmt:send-receive 'get-num-runs #f (list runpatt)))




;; Use the special run-id == #f scenario here since there is no run yet
(define (rmt:register-run keyvals runname state status user contour)
  (rmt:send-receive 'register-run #f (list keyvals runname state status user contour)))
    
(define (rmt:get-run-name-from-id run-id)
  (rmt:send-receive 'get-run-name-from-id run-id (list run-id)))

(define (rmt:delete-run run-id)
  (rmt:send-receive 'delete-run run-id (list run-id)))

(define (rmt:update-run-stats run-id stats)
  (rmt:send-receive 'update-run-stats #f (list run-id stats)))

(define (rmt:delete-old-deleted-test-records)
  (rmt:send-receive 'delete-old-deleted-test-records #f '()))

(define (rmt:get-runs runpatt count offset keypatts)
  (rmt:send-receive 'get-runs #f (list runpatt count offset keypatts)))




(define (rmt:get-all-run-ids)
  (rmt:send-receive 'get-all-run-ids #f '()))

(define (rmt:get-prev-run-ids run-id)
  (rmt:send-receive 'get-prev-run-ids #f (list run-id)))

(define (rmt:lock/unlock-run run-id lock unlock user)








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(define (rmt:top-test-set-per-pf-counts run-id test-name)
  (rmt:send-receive 'top-test-set-per-pf-counts run-id (list run-id test-name)))

(define (rmt:get-raw-run-stats run-id)
  (rmt:send-receive 'get-raw-run-stats run-id (list run-id)))

(define (rmt:get-test-times runname target)
  (rmt:send-receive 'get-test-times #f (list runname target ))) 

;;======================================================================
;;  R U N S
;;======================================================================

(define (rmt:get-run-info run-id)
  (rmt:send-receive 'get-run-info run-id (list run-id)))

(define (rmt:get-num-runs runpatt)
  (rmt:send-receive 'get-num-runs #f (list runpatt)))

(define (rmt:get-runs-cnt-by-patt runpatt targetpatt keys)
  (rmt:send-receive 'get-runs-cnt-by-patt #f (list runpatt  targetpatt keys)))

;; Use the special run-id == #f scenario here since there is no run yet
(define (rmt:register-run keyvals runname state status user contour)
  (rmt:send-receive 'register-run #f (list keyvals runname state status user contour)))
    
(define (rmt:get-run-name-from-id run-id)
  (rmt:send-receive 'get-run-name-from-id run-id (list run-id)))

(define (rmt:delete-run run-id)
  (rmt:send-receive 'delete-run run-id (list run-id)))

(define (rmt:update-run-stats run-id stats)
  (rmt:send-receive 'update-run-stats #f (list run-id stats)))

(define (rmt:delete-old-deleted-test-records)
  (rmt:send-receive 'delete-old-deleted-test-records #f '()))

(define (rmt:get-runs runpatt count offset keypatts)
  (rmt:send-receive 'get-runs #f (list runpatt count offset keypatts)))

(define (rmt:simple-get-runs runpatt count offset target)
  (rmt:send-receive 'simple-get-runs #f (list runpatt count offset target)))

(define (rmt:get-all-run-ids)
  (rmt:send-receive 'get-all-run-ids #f '()))

(define (rmt:get-prev-run-ids run-id)
  (rmt:send-receive 'get-prev-run-ids #f (list run-id)))

(define (rmt:lock/unlock-run run-id lock unlock user)
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	(debug:print 3 *default-log-port* "WARNING: Invalid " (if status "status" "state")
		     " value \"" (if status state-in status-in) "\", update your validvalues section in megatest.config"))
    (rmt:send-receive 'teststep-set-status! run-id (list run-id test-id teststep-name state-in status-in comment logfile))))

(define (rmt:get-steps-for-test run-id test-id)
  (rmt:send-receive 'get-steps-for-test run-id (list run-id test-id)))




;;======================================================================
;;  T E S T   D A T A 
;;======================================================================

(define (rmt:read-test-data run-id test-id categorypatt #!key (work-area #f)) 
  (rmt:send-receive 'read-test-data run-id (list run-id test-id categorypatt)))
;;   (let ((tdb  (rmt:open-test-db-by-test-id run-id test-id work-area: work-area)))
;;     (if tdb
;; 	(tdb:read-test-data tdb test-id categorypatt)
;; 	'())))



(define (rmt:testmeta-add-record testname)
  (rmt:send-receive 'testmeta-add-record #f (list testname)))

(define (rmt:testmeta-get-record testname)
  (rmt:send-receive 'testmeta-get-record #f (list testname)))









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	(debug:print 3 *default-log-port* "WARNING: Invalid " (if status "status" "state")
		     " value \"" (if status state-in status-in) "\", update your validvalues section in megatest.config"))
    (rmt:send-receive 'teststep-set-status! run-id (list run-id test-id teststep-name state-in status-in comment logfile))))

(define (rmt:get-steps-for-test run-id test-id)
  (rmt:send-receive 'get-steps-for-test run-id (list run-id test-id)))

(define (rmt:get-steps-info-by-id test-step-id)
  (rmt:send-receive 'get-steps-info-by-id #f (list test-step-id)))

;;======================================================================
;;  T E S T   D A T A 
;;======================================================================

(define (rmt:read-test-data run-id test-id categorypatt #!key (work-area #f)) 
  (rmt:send-receive 'read-test-data run-id (list run-id test-id categorypatt)))
(define (rmt:read-test-data* run-id test-id categorypatt varpatt #!key (work-area #f)) 

  (rmt:send-receive 'read-test-data* run-id (list run-id test-id categorypatt varpatt)))

(define (rmt:get-data-info-by-id test-data-id)
   (rmt:send-receive 'get-data-info-by-id #f (list test-data-id)))

(define (rmt:testmeta-add-record testname)
  (rmt:send-receive 'testmeta-add-record #f (list testname)))

(define (rmt:testmeta-get-record testname)
  (rmt:send-receive 'testmeta-get-record #f (list testname)))
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  (rmt:send-receive 'tasks-add #f (list action owner target runname testpatt params)))

(define (rmt:tasks-set-state-given-param-key param-key new-state)
  (rmt:send-receive 'tasks-set-state-given-param-key #f (list  param-key new-state)))

(define (rmt:tasks-get-last target runname)
  (rmt:send-receive 'tasks-get-last #f (list target runname)))

















;;======================================================================
;; A R C H I V E S
;;======================================================================

(define (rmt:archive-get-allocations  testname itempath dneeded)
  (rmt:send-receive 'archive-get-allocations #f (list testname itempath dneeded)))








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  (rmt:send-receive 'tasks-add #f (list action owner target runname testpatt params)))

(define (rmt:tasks-set-state-given-param-key param-key new-state)
  (rmt:send-receive 'tasks-set-state-given-param-key #f (list  param-key new-state)))

(define (rmt:tasks-get-last target runname)
  (rmt:send-receive 'tasks-get-last #f (list target runname)))

;;======================================================================
;; N O   S Y N C   D B 
;;======================================================================

(define (rmt:no-sync-set var val)
  (rmt:send-receive 'no-sync-set #f `(,var ,val)))

(define (rmt:no-sync-get/default var default)
  (rmt:send-receive 'no-sync-get/default #f `(,var ,default)))

(define (rmt:no-sync-del! var)
  (rmt:send-receive 'no-sync-del! #f `(,var)))

(define (rmt:no-sync-get-lock keyname)
  (rmt:send-receive 'no-sync-get-lock #f `(,keyname)))

;;======================================================================
;; A R C H I V E S
;;======================================================================

(define (rmt:archive-get-allocations  testname itempath dneeded)
  (rmt:send-receive 'archive-get-allocations #f (list testname itempath dneeded)))
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