Megatest

    ;; TEST DATA
    test-data-rollup
    csv->test-data

    ;; MISC
    sync-inmem->db

    ;; TESTMETA
    ;; TESTMETAl
    testmeta-add-record
    testmeta-update-field

    ;; TASKS
    tasks-add
    tasks-set-state-given-param-key
    ))

;;======================================================================
;; ALLDATA
;;======================================================================
;;

;; attempt to consolidate a bunch of global information into one struct to toss around
(defstruct alldat
  ;; misc
  (denoise           (make-hash-table))
  (areapath          #f) ;; i.e. toppath
  (mtconfig          #f)
  (log-port          #f)
  (areadat           #f) ;; i.e. runremote
  (ulexdat           #f) ;; connection to the databases
  (rmt-mutex         (make-mutex))
  (db-sync-mutex     (make-mutex))
  (db-with-db-mutex  (make-mutex))
  (read-only-queries api:read-only-queries)
  (write-queries     api:write-queries)
  (max-api-process-requests 0)
  (api-process-request-count 0)

(declare (uses ulex.import))
(declare (uses cookie.import))
(declare (uses stml2.import))
(declare (uses ducttape-lib.import))
(declare (uses mtconfigf.import))

(declare (uses gutilsmod))
(declare (uses servermod))
(declare (uses megamod))
(declare (uses commonmod))
(declare (uses rmtmod))
(declare (uses runsmod))
(declare (uses dbmod))
(declare (uses testsmod))
(declare (uses tasksmod))
(declare (uses dcommonmod))
(declare (uses tasksmod))


(import gutilsmod)
(import servermod)
(import megamod)
(import commonmod)
(import rmtmod)
(import runsmod)
(import dbmod)
(import testsmod)
(import tasksmod)

       (iup:hbox
        (iup:button "Hide All" #:action (lambda (obj)
                                          (for-each (lambda (graph-cell)
                                                      (let* ((graph-dat   (hash-table-ref (dboard:tabdat-graph-cell-table tabdat) graph-cell)))
                                                        (dboard:graph-dat-flag-set! graph-dat #f)))
                                                    (hash-table-keys (dboard:tabdat-graph-cell-table tabdat)))))))
      ))))

;;======================================================================
;; SYSTEM MONITOR - Track relevant Megatest processes
;;======================================================================
;;
;; A gui for launching tests
;;
(define (dashboard:sysmon commondat tabdat #!key (tab-num #f))
  (let* ((drawing               (vg:drawing-new))
	 (sysmon-tab-updater (lambda ()	
			       (debug:catch-and-dump 
				(lambda ()
				  (let ((tabdat        (dboard:common-get-tabdat commondat tab-num: tab-num)))
				    (if tabdat
					(let ((last-data-update (dboard:tabdat-last-data-update tabdat))
					      (now-time         (current-seconds)))
					  (dashboard:sysmon-canvas-updater commondat tabdat tab-num) ;; redraws canvas on user input (I think...)
					  ))))
				   "dashboard:sysmon-tab-updater")))
	 (key-listboxes #f) ;; 
	 (update-keyvals (lambda ()
			   (dboard:target-updater tabdat))))
    (dboard:tabdat-drawing-set! tabdat drawing)
    (dboard:commondat-add-updater commondat sysmon-tab-updater tab-num: tab-num)
    (iup:vbox
     (let* ((cnv-obj (iup:canvas 
		      ;; #:size "250x250" ;; "500x400"
		      #:expand "YES"
		      #:scrollbar "YES"
		      #:posx "0.5"
		      #:posy "0.5"
		      #:action (make-canvas-action
				(lambda (c xadj yadj)
				  (debug:catch-and-dump
				   (lambda ()
				     (if (not (dboard:tabdat-cnv tabdat))
					 (let ((cnv     (dboard:tabdat-cnv tabdat)))
					   (dboard:tabdat-cnv-set! tabdat c)
					   (vg:drawing-cnv-set! (dboard:tabdat-drawing tabdat)
								(dboard:tabdat-cnv tabdat))))
				     (let ((drawing (dboard:tabdat-drawing tabdat))
					   (old-xadj (dboard:tabdat-xadj   tabdat))
					   (old-yadj (dboard:tabdat-yadj   tabdat)))
				       (if (not (and (eq? xadj old-xadj)(eq? yadj old-yadj)))
					   (begin
					     ;; (print  "xadj: " xadj " yadj: " yadj "changed: "(eq? xadj old-xadj) " " (eq? yadj old-yadj))
					     (dboard:tabdat-view-changed-set! tabdat #t)
					     (dboard:tabdat-xadj-set! tabdat (* -2000 (- xadj 0.5)))
					     (dboard:tabdat-yadj-set! tabdat (*  2000 (- yadj 0.5)))
					     ))))
				   "iup:canvas action")))
		      #:wheel-cb  (lambda (obj step x y dir) ;; dir is 4 for up and 5 for down. I think.
				    (debug:catch-and-dump
				     (lambda ()
				       (let* ((drawing (dboard:tabdat-drawing tabdat))
					      (scalex  (vg:drawing-scalex drawing)))
					 (dboard:tabdat-view-changed-set! tabdat #t)
					 ;; (print "step: " step " x: " x " y: " y " dir: " dir " scalex: " scalex)
					 (vg:drawing-scalex-set! drawing
								 (+ scalex
								    (if (> step 0)
									(* scalex  0.02)
									(* scalex -0.02))))))
				     "wheel-cb"))
		      )))
       cnv-obj))))

;; run times canvas updater
;;
(define (dashboard:sysmon-canvas-updater commondat tabdat tab-num)
  (let ((cnv (dboard:tabdat-cnv tabdat))
	(dwg (dboard:tabdat-drawing tabdat))
	(mtx (dboard:tabdat-runs-mutex tabdat))
	(vch (dboard:tabdat-view-changed tabdat)))
    (if (and cnv dwg vch)
	(begin
	  (vg:drawing-xoff-set! dwg (dboard:tabdat-xadj tabdat))
	  (vg:drawing-yoff-set! dwg (dboard:tabdat-yadj tabdat))
	  (mutex-lock! mtx)
	  (canvas-clear! cnv)
	  (vg:draw dwg tabdat)
	  (mutex-unlock! mtx)
	  (dboard:tabdat-view-changed-set! tabdat #f)))))
  


;;======================================================================
;; R U N
;;======================================================================
;;
;; display and manage a single run at a time

(define (make-dashboard-buttons commondat) ;;  runs-sum-dat new-view-dat)
  (let* ((stats-dat       (dboard:tabdat-make-data))
	 (runs-dat        (dboard:tabdat-make-data))
	 (onerun-dat      (dboard:tabdat-make-data)) ;; name for run-summary structure 
	 (runcontrols-dat (dboard:tabdat-make-data))
	 (runtimes-dat    (dboard:tabdat-make-data))
	 (sysmon-dat      (dboard:tabdat-make-data))
	 (nruns           (dboard:tabdat-numruns runs-dat))
	 (ntests          (dboard:tabdat-num-tests runs-dat))
	 (keynames        (dboard:tabdat-dbkeys runs-dat))
	 (nkeys           (length keynames))
	 (runsvec         (make-vector nruns))
	 (header          (make-vector nruns))
	 (lftcol          (make-vector ntests))

			  (dashboard:summary commondat stats-dat tab-num: 0)
			  runs-view
			  (dashboard:runs-summary commondat onerun-dat tab-num: 2)
			  ;; (dashboard:new-view db data new-view-dat tab-num: 3)
			  (dashboard:run-controls commondat runcontrols-dat tab-num: 3)
			  (dashboard:run-times commondat runtimes-dat tab-num: 4)
			  ;; ;; (dashboard:runs-summary commondat onerun-dat tab-num: 4)
			  (dashboard:sysmon commondat sysmon-dat tab-num: 5)
			  additional-views
			  )))
	;; (set! (iup:callback tabs tabchange-cb:) (lambda (a b c)(print "SWITCHED TO TAB: " a " " b " " c)))
	(iup:attribute-set! tabs "TABTITLE0" "Summary")
	(iup:attribute-set! tabs "TABTITLE1" "Runs")
	(iup:attribute-set! tabs "TABTITLE2" "Run Summary")
	(iup:attribute-set! tabs "TABTITLE3" "Run Control")
	(iup:attribute-set! tabs "TABTITLE4" "Run Times")
	(iup:attribute-set! tabs "TABTITLE5" "Sysmon")
	;; (iup:attribute-set! tabs "TABTITLE3" "New View")
	;; (iup:attribute-set! tabs "TABTITLE4" "Run Control")

	;; set the tab names for user added tabs
	(for-each
	 (lambda (tab-info)
	   (iup:attribute-set! tabs (conc "TABTITLE" (car tab-info)) (cdr tab-info)))
	 additional-tabnames)
	
	(iup:attribute-set! tabs "BGCOLOR" "190 190 190")
	;; make the iup tabs object available (for changing color for example)
	(dboard:commondat-hide-not-hide-tabs-set! commondat tabs)
	;; now set up the tabdat lookup
	(dboard:common-set-tabdat! commondat 0 stats-dat)
	(dboard:common-set-tabdat! commondat 1 runs-dat)
	(dboard:common-set-tabdat! commondat 2 onerun-dat)
	(dboard:common-set-tabdat! commondat 3 runcontrols-dat)
	(dboard:common-set-tabdat! commondat 4 runtimes-dat)
	(dboard:common-set-tabdat! commondat 5 sysmon-dat)

	(iup:vbox
	 tabs
	 ;; controls
	 ))))
    (vector keycol lftcol header runsvec)))

(import (prefix ulex ulex:))

(import commonmod)
(import itemsmod)
(import apimod)
(import dbmod)

;; (include "rmt-inc.scm")

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

;; generate entries for ~/.megatestrc with the following
;;
;;  grep define ../rmt.scm | grep rmt: |perl -pi -e 's/\(define\s+\((\S+)\W.*$/\1/'|sort -u

			#f)))
	  (if cinfo
	      cinfo
	      (if (server:check-if-running areapath)
		  (client:setup areapath)
		  #f))))

;; return the handle struct for sending queries to a specific database
;;  - initializes the connection object if this is the first access
;;    - finds the "captain" and asks who to talk to for the given dbfname
;;    - establishes the connection to the current dbowner
;;
(define *send-receive-mutex* (make-mutex)) ;; should have separate mutex per run-id
(define (rmt:connect alldat dbfname)
  (let* ((ulexdat    (let ((uconn (alldat-ulexdat alldat)))
		       (if uconn
			   uconn
	  		   (let* ((new-ulexdat (ulex:setup))) ;; establish connection to ulex
			     (alldat-ulexdat-set! alldat new-ulexdat)
			     (rmt:setup-ulex alldat)
			     new-ulexdat)))))
    (ulex:connect ulexdat dbfname)))

;; set up a connection to the current owner of the dbfile associated with rid
;; then send the query to that dbfile owner and wait for a response.
;;
(define (rmt:send-receive cmd rid params #!key (attemptnum 1)(area-dat #f)) ;; start attemptnum at 1 so the modulo below works as expected
  (let* ((alldat   *alldat*)
	 (areapath (alldat-areapath alldat))
	 (dbfname  (if (or (not rid)(< rid 1)) ;; this is the criteria for "main.db"
		       "main.db"
		       (conc rid ".db")))
	 (dbfile   (conc areapath "/.db/" dbfname))
	 (ulexconn (rmt:connect alldat dbfname)))  
  (rmt:open-qry-close-locally cmd 0 params))
    (rmt:open-qry-close-locally cmd 0 params)))

;; setup the remote calls
(define (rmt:setup-ulex alldat)
  (let ((udata (alldat-ulexdat alldat)))
    (ulex:register-handler udata 'ping common:get-full-version)
  ))
;;   
;; ;; #;(common:telemetry-log (conc "rmt:"(->string cmd))
;; ;; #;(define (rmt:send-receive cmd rid params #!key (attemptnum 1)(area-dat #f)) ;; start attemptnum at 1 so the modulo below works as expected
;; ;; 
;; ;; #;(common:telemetry-log (conc "rmt:"(->string cmd))
;; ;; payload: `((rid . ,rid)
;; ;; (params . ,params)))

;;   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.
;;
;;======================================================================

;; (use rpc pkts mailbox sqlite3)
  

(module ulex
    *
     ;;    #;(
     ;;     ;; areas
     ;;     make-area
     ;;     area->alist
     ;;     ;; server
     ;;     launch
     ;;     update-known-servers
     ;;     shutdown
     ;;     get-best-server
     ;;     ;; client side
     ;;     call
     ;;     ;; queries, procs and system commands (i.e. workers)
     ;;     register
     ;;     register-batch
     ;;     ;; database - note: most database stuff need not be exposed, these calls may be removed from exports in future
     ;;     open-db
     ;;     ;; ports
     ;;     pl-find-port
     ;;     pl-get-prev-used-port
     ;;     pl-open-db
     ;;     pl-open-run-close
     ;;     pl-release-port
     ;;     pl-set-port
     ;;     pl-take-port
     ;;     pl-is-port-available
     ;;     pl-get-port-state
     ;;     ;; system
     ;;     get-normalized-cpu-load
	 

     ;; )

(import scheme posix chicken data-structures ports extras files mailbox)
(import rpc srfi-18 pkts matchable regex
(import srfi-18 pkts matchable regex
	typed-records srfi-69 srfi-1
	srfi-4 regex-case
	(prefix sqlite3 sqlite3:)
	foreign
	tcp6
	tcp) ;; ulex-netutil)
	;; ulex-netutil

;;======================================================================
;; D E B U G   H E L P E R S
;;======================================================================
    
(define (dbg> . args)
  (with-output-to-port (current-error-port)
    (lambda ()
      (apply print "dbg> " args))))

(define (debug-pp . args)
  (if (get-environment-variable "ULEX_DEBUG")
      (with-output-to-port (current-error-port)
	(lambda ()
	  (apply pp args)))))

(define *default-debug-port* (current-error-port))

(define (sdbg> fn stage-name stage-start stage-end start-time . message)
  (if (get-environment-variable "ULEX_DEBUG")
      (with-output-to-port *default-debug-port* 
	(lambda ()
	  (apply print "ulex:" fn " " stage-name " took " (- (if stage-end stage-end (current-milliseconds)) stage-start) " ms. "
		 (if start-time
		     (conc "total time " (- (current-milliseconds) start-time)
			   " ms.")
		     "")
		 message
		 )))))

;;======================================================================
;; M A C R O S
;;======================================================================
;; iup callbacks are not dumping the stack, this is a work-around
;;

;; Some of these routines use:
;;
;;     http://www.cs.toronto.edu/~gfb/scheme/simple-macros.html
;;
;; Syntax for defining macros in a simple style similar to function definiton,
;;  when there is a single pattern for the argument list and there are no keywords.
;;
;; (define-simple-syntax (name arg ...) body ...)
;;

(define-syntax define-simple-syntax
  (syntax-rules ()
    ((_ (name arg ...) body ...)
     (define-syntax name (syntax-rules () ((name arg ...) (begin body ...)))))))

(define-simple-syntax (catch-and-dump proc procname)
  (handle-exceptions
   exn
   (begin
     (print-call-chain (current-error-port))
     (with-output-to-port (current-error-port)
       (lambda ()
         (print ((condition-property-accessor 'exn 'message) exn))
         (print "Callback error in " procname)
         (print "Full condition info:\n" (condition->list exn)))))
   (proc)))


;;======================================================================
;;  R E C O R D S
;;======================================================================

;; information about me as a server
;;
(defstruct area
  ;; about this area
  (useportlogger #f)
  (lowport       32768)
  (server-type   'auto)  ;; auto=create up to five servers/pkts, main=create pkts, passive=no pkt (unless there are no pkts at all)
  (conn          #f)
  (port          #f)
  (myaddr        (get-my-best-address))
  pktid          ;; get pkt from hosts table if needed
  pktfile
  pktsdir
  dbdir
  (dbhandles     (make-hash-table)) ;; fname => list-of-dbh, NOTE: Should really never need more than one?
  (mutex         (make-mutex))
  (rtable        (make-hash-table)) ;; registration table of available actions
  (dbs           (make-hash-table)) ;; filename => random number, used for choosing what dbs I serve
  ;; about other servers
  (hosts         (make-hash-table)) ;; key => hostdat
  (hoststats     (make-hash-table)) ;; key => alist of fname => ( qcount . qtime )
  (reqs          (make-hash-table)) ;; uri => queue
  ;; work queues
  (wqueues       (make-hash-table)) ;; fname => qdat
  (stats         (make-hash-table)) ;; fname => totalqueries
  (last-srvup    (current-seconds)) ;; last time we updated the known servers
  (cookie2mbox   (make-hash-table)) ;; map cookie for outstanding request to mailbox of awaiting call
  (ready #f)
  (health        (make-hash-table)) ;; ipaddr:port => num failed pings since last good ping
  )

;; host stats
	hostinfo)
;;
(defstruct hostdat
  (pkt      #f)
  (dbload   (make-hash-table))  ;; "dbfile.db" => queries/min
  (hostload #f)                 ;; normalized load ( 5min load / numcpus )
  )

;; dbdat
;;
(defstruct dbdat
  (dbh    #f)
  (fname  #f)
  (write-access #f)
  (sths   (make-hash-table))  ;; hash mapping query strings to handles
  )

;; qdat
;;
(defstruct qdat
  (writeq  (make-queue))
  (readq   (make-queue))
  (rwq     (make-queue))
  (logq    (make-queue)) ;; do we need a queue for logging? yes, if we use sqlite3 db for logging
  (osshort (make-queue))
  (oslong  (make-queue))
  (misc    (make-queue)) ;; used for things like ping-full
  )

;; calldat
;;
(defstruct calldat
  (ctype 'dbwrite)
  (obj   #f)              ;; this would normally be an SQL statement e.g. SELECT, INSERT etc.
  (rtime (current-milliseconds)))

;; make it a global? Well, it is local to area module

(define *pktspec*
  `((server (hostname . h)
	    (port     . p)
	    (pid      . i)
	    (ipaddr   . a)
	    )
    (data   (hostname . h)  ;; sender hostname
	    (port     . p)  ;; sender port
	    (ipaddr   . a)  ;; sender ip
	    (hostkey  . k)  ;; sending host key - store info at server under this key
	    (servkey  . s)  ;; server key - this needs to match at server end or reject the msg
	    (format   . f)  ;; sb=serialized-base64, t=text, sx=sexpr, j=json
	    (data     . d)  ;; base64 encoded slln data
	    )))

;; work item
;;
(defstruct witem
  (rhost #f)   ;; return host
  (ripaddr #f) ;; return ipaddr
  (rport #f)   ;; return port
  (servkey #f) ;; the packet representing the client of this workitem, used by final send-message
  (rdat  #f)   ;; the request - usually an sql query, type is rdat
  (action #f)  ;; the action: immediate, dbwrite, dbread,oslong, osshort
  (cookie #f)  ;; cookie id for response
  (data   #f)  ;; the data payload, i.e. parameters
  (result #f)  ;; the result from processing the data
  (caller #f)) ;; the calling peer according to rpc itself

(define (trim-pktid pktid)
  (if (string? pktid)
      (substring pktid 0 4)
      "nopkt"))

(define (any->number num)
  (cond
   ((number? num) num)
   ((string? num) (string->number num))
   (else num)))

(use trace)
(trace-call-sites #t)

;;======================================================================
;; D A T A B A S E   H A N D L I N G 
;;======================================================================

;; look in dbhandles for a db, return it, else return #f
;;
(define (get-dbh acfg fname)
  (let ((dbh-lst (hash-table-ref/default (area-dbhandles acfg) fname '())))
    (if (null? dbh-lst)
	(begin
	  ;; (print "opening db for " fname)
	  (open-db acfg fname)) ;; Note that the handles get put back in the queue in the save-dbh calls
	(let ((rem-lst (cdr dbh-lst)))
	  ;; (print "re-using saved connection for " fname)
	  (hash-table-set! (area-dbhandles acfg) fname rem-lst)
	  (car dbh-lst)))))

(define (save-dbh acfg fname dbdat)
    ;; (print "saving dbh for " fname)
    (hash-table-set! (area-dbhandles acfg) fname (cons dbdat (hash-table-ref/default (area-dbhandles acfg) fname '()))))

;; open the database, if never before opened init it. put the handle in the
;; open db's hash table
;; returns: the dbdat
;;
(define (open-db acfg fname)
  (let* ((fullname     (conc (area-dbdir acfg) "/" fname))
	 (exists       (file-exists? fullname))
	 (write-access (if exists
			   (file-write-access? fullname)
			   (file-write-access? (area-dbdir acfg))))
	 (db           (sqlite3:open-database fullname))
	 (handler      (sqlite3:make-busy-timeout 136000))
	 )
    (sqlite3:set-busy-handler! db handler)
    (sqlite3:execute db "PRAGMA synchronous = 0;")
    (if (not exists) ;; need to init the db
	(if write-access
	    (let ((isql (get-rsql acfg 'dbinitsql))) ;; get the init sql statements
	      ;; (sqlite3:with-transaction
	      ;;  db
	      ;;  (lambda ()
		 (if isql
		     (for-each
		      (lambda (sql)
			(sqlite3:execute db sql))
		      isql)))
	    (print "ERROR: no write access to " (area-dbdir acfg))))
    (make-dbdat dbh: db fname: fname write-access: write-access)))

;; This is a low-level command to retrieve or to prepare, save and return a prepared statment
;; you must extract the db handle
;;
(define (get-sth db cache stmt)
  (if (hash-table-exists? cache stmt)
      (begin
	;; (print "Reusing cached stmt for " stmt)
	(hash-table-ref/default cache stmt #f))
      (let ((sth (sqlite3:prepare db stmt)))
	(hash-table-set! cache stmt sth)
	;; (print "prepared stmt for " stmt)
	sth)))

;; a little more expensive but does all the tedious deferencing - only use if you don't already
;; have dbdat and db sitting around
;;
(define (full-get-sth acfg fname stmt)
  (let* ((dbdat  (get-dbh acfg fname))
	 (db     (dbdat-dbh dbdat))
	 (sths   (dbdat-sths dbdat)))
    (get-sth db sths stmt)))

;; write to a db
;; acfg: area data
;; rdat: request data
;; hdat: (host . port)
;;
;; (define (dbwrite acfg rdat hdat data-in)
;;   (let* ((dbname (car data-in))
;; 	 (dbdat  (get-dbh acfg dbname))
;; 	 (db     (dbdat-dbh dbdat))
;; 	 (sths   (dbdat-sths dbdat))
;; 	 (stmt   (calldat-obj rdat))
;; 	 (sth    (get-sth db sths stmt))
;; 	 (data   (cdr data-in)))
;;     (print "dbname: " dbname " acfg: " acfg " rdat: " (calldat->alist rdat) " hdat: " hdat " data: " data)
;;     (print "dbdat: " (dbdat->alist dbdat))
;;     (apply sqlite3:execute sth data)
;;     (save-dbh acfg dbname dbdat)
;;     #t
;;     ))

(define (finalize-all-db-handles acfg)
  (let* ((dbhandles (area-dbhandles acfg))  ;; dbhandles is hash of fname ==> dbdat
	 (num       0))
    (for-each
     (lambda (area-name)
       (print "Closing handles for " area-name)
       (let ((dbdats (hash-table-ref/default dbhandles area-name '())))
	 (for-each
	  (lambda (dbdat)
	    ;; first close all statement handles
	    (for-each
	     (lambda (sth)
	       (sqlite3:finalize! sth)
	       (set! num (+ num 1)))
	     (hash-table-values (dbdat-sths dbdat)))
	    ;; now close the dbh
	    (set! num (+ num 1))
	    (sqlite3:finalize! (dbdat-dbh dbdat)))
	  dbdats)))
     (hash-table-keys dbhandles))
    (print "FINALIZED " num " dbhandles")))

;;======================================================================
;; W O R K   Q U E U E   H A N D L I N G 
;;======================================================================

(define (register-db-as-mine acfg dbname)
  (let ((ht (area-dbs acfg)))
    (if (not (hash-table-ref/default ht dbname #f))
	(hash-table-set! ht dbname (random 10000)))))
	
(define (work-queue-add acfg fname witem)
  (let* ((work-queue-start (current-milliseconds))
	 (action           (witem-action witem)) ;; NB the action is the index into the rdat actions
	 (qdat             (or (hash-table-ref/default (area-wqueues acfg) fname #f)
			       (let ((newqdat (make-qdat)))
				 (hash-table-set! (area-wqueues acfg) fname newqdat)
				 newqdat)))
	 (rdat             (hash-table-ref/default (area-rtable acfg) action #f)))
    (if rdat
	(queue-add!
	 (case (calldat-ctype rdat)
	   ((dbwrite)   (register-db-as-mine acfg fname)(qdat-writeq qdat))
	   ((dbread)    (register-db-as-mine acfg fname)(qdat-readq  qdat))
	   ((dbrw)      (register-db-as-mine acfg fname)(qdat-rwq    qdat))
	   ((oslong)    (qdat-oslong qdat))
	   ((osshort)   (qdat-osshort qdat))
	   ((full-ping) (qdat-misc  qdat))
	   (else
	    (print "ERROR: no queue for " action ". Adding to dbwrite queue.")
	    (qdat-writeq qdat)))
	 witem)
	(case action
	  ((full-ping)(qdat-misc qdat))
	  (else
	   (print "ERROR: No action " action " was registered"))))
    (sdbg> "work-queue-add" "queue-add" work-queue-start #f #f)
    #t)) ;; for now, simply return #t to indicate request got to the queue

(define (doqueue acfg q fname dbdat dbh)
  ;; (print "doqueue: " fname)
  (let* ((start-time (current-milliseconds))
	 (qlen       (queue-length q)))
    (if (> qlen 1)
	(print "Processing queue of length " qlen))
    (let loop ((count      0)
	       (responses '()))
      (let ((delta (- (current-milliseconds) start-time)))
	(if (or (queue-empty? q)
		(> delta 400)) ;; stop working on this queue after 400ms have passed
	    (list count delta responses) ;; return count, delta and responses list
	    (let* ((witem  (queue-remove! q))
		   (action (witem-action witem))
		   (rdat   (witem-rdat   witem))
		   (stmt   (calldat-obj rdat))
		   (sth    (full-get-sth acfg fname stmt))
		   (ctype  (calldat-ctype rdat))
		   (data   (witem-data   witem))
		   (cookie (witem-cookie witem)))
	      ;; do the processing and save the result in witem-result
	      (witem-result-set!
	       witem
	       (case ctype ;; action
		 ((noblockwrite) ;; blind write, no ack of success returned
		  (apply sqlite3:execute sth data)
		  (sqlite3:last-insert-rowid dbh))
		 ((dbwrite)      ;; blocking write   
		  (apply sqlite3:execute sth data)
		  #t)
		 ((dbread) ;; TODO: consider breaking this up and shipping in pieces for large query
		  (apply sqlite3:map-row (lambda x x) sth data))
		 ((full-ping)  'full-ping)
		 (else (print "Not ready for action " action) #f)))
	      (loop (add1 count)
		    (if cookie
			(cons witem responses)
			responses))))))))

;; do up to 400ms of processing on each queue
;; - the work-queue-processor will allow the max 1200ms of work to complete but it will flag as overloaded
;; 
(define (process-db-queries acfg fname)
  (if (hash-table-exists? (area-wqueues acfg) fname)
      (let* ((process-db-queries-start-time (current-milliseconds))
	     (qdat             (hash-table-ref/default (area-wqueues acfg) fname #f))
	     (queue-sym->queue (lambda (queue-sym)
				 (case queue-sym  ;; lookup the queue from qdat given a name (symbol)
				   ((wqueue)  (qdat-writeq qdat))
				   ((rqueue)  (qdat-readq  qdat))
				   ((rwqueue) (qdat-rwq    qdat))
				   ((misc)    (qdat-misc   qdat))
				   (else #f))))
	     (dbdat   (get-dbh acfg fname))
	     (dbh     (if (dbdat? dbdat)(dbdat-dbh dbdat) #f))
	     (nowtime (current-seconds)))
	;; handle the queues that require a transaction
	;;
	(map ;; 
	 (lambda (queue-sym)
	   ;; (print "processing queue " queue-sym)
	   (let* ((queue (queue-sym->queue queue-sym)))
	     (if (not (queue-empty? queue))
		 (let ((responses
			(sqlite3:with-transaction ;; todo - catch exceptions...
			 dbh
			 (lambda ()
			   (let* ((res (doqueue acfg queue fname dbdat dbh))) ;; this does the work!
			     ;; (print "res=" res)
			     (match res
			      ((count delta responses)
			       (update-stats acfg fname queue-sym delta count)
			       (sdbg> "process-db-queries" "sqlite3-transaction" process-db-queries-start-time #f #f)
			       responses) ;; return responses
			      (else
			       (print "ERROR: bad return data from doqueue " res)))
			     )))))
		   ;; having completed the transaction, send the responses.
		   ;; (print "INFO: sending " (length responses) " responses.")
		   (let loop ((responses-left responses))
		     (cond
		      ((null? responses-left)  #t)
		      (else
		       (let* ((witem    (car responses-left))
			      (response (cdr responses-left)))  
			 (call-deliver-response acfg (witem-ripaddr witem)(witem-rport witem)
						(witem-cookie witem)(witem-result witem)))
		       (loop (cdr responses-left))))))
		 )))
	 '(wqueue rwqueue rqueue))
	
	;; handle misc queue
	;;
	;; (print "processing misc queue")
	(let ((queue (queue-sym->queue 'misc)))
	  (doqueue acfg queue fname dbdat dbh))
	;; ....
	(save-dbh acfg fname dbdat)
	#t ;; just to let the tests know we got here
	)
      #f ;; nothing processed
      ))

;; run all queues in parallel per db but sequentially per queue for that db.
;;  - process the queues every 500 or so ms
;;  - allow for long running queries to continue but all other activities for that
;;    db will be blocked.
;;
(define (work-queue-processor acfg)
  (let* ((threads (make-hash-table))) ;; fname => thread
    (let loop ((fnames      (hash-table-keys (area-wqueues acfg)))
	       (target-time (+ (current-milliseconds) 50)))
      ;;(if (not (null? fnames))(print "Processing for these databases: " fnames))
      (for-each
       (lambda (fname)
	 ;; (print "processing for " fname)
	 ;;(process-db-queries acfg fname))
	 (let ((th (hash-table-ref/default threads fname #f)))
	   (if (and th (not (member (thread-state th) '(dead terminated))))
	       (begin
		 (print "WARNING: worker thread for " fname " is taking a long time.")
		 (print "Thread is in state " (thread-state th)))
	       (let ((th1 (make-thread (lambda ()
					 ;; (catch-and-dump
					 ;;  (lambda ()
					    ;; (print "Process queries for " fname)
					    (let ((start-time (current-milliseconds)))
					      (process-db-queries acfg fname)
					      ;; (thread-sleep! 0.01) ;; need the thread to take at least some time
					      (hash-table-delete! threads fname)) ;; no mutexes?
					    fname)
					  "th1"))) ;; ))
		 (hash-table-set! threads fname th1)
		 (thread-start! th1)))))
       fnames)
      ;; (thread-sleep! 0.1) ;; give the threads some time to process requests
      ;; burn time until 400ms is up
      (let ((now-time (current-milliseconds)))
	(if (< now-time target-time)
	    (let ((delta (- target-time now-time)))
	      (thread-sleep! (/ delta 1000)))))
      (loop (hash-table-keys (area-wqueues acfg))
	    (+ (current-milliseconds) 50)))))

;;======================================================================
;; S T A T S   G A T H E R I N G
;;======================================================================

(defstruct stat
  (qcount-avg  0)                  ;; coarse running average
  (qtime-avg   0)                  ;; coarse running average
  (qcount      0)                  ;; total
  (qtime       0)                  ;; total
  (last-qcount 0)                  ;; last 
  (last-qtime  0)                  ;; last
  (dbs        '())                 ;; list of db files handled by this node
  (when        0))                 ;; when the last query happened - seconds


(define (update-stats acfg fname bucket duration numqueries)
  (let* ((key   fname) ;; for now do not use bucket. Was: (conc fname "-" bucket)) ;; lazy but good enough
	 (stats (or (hash-table-ref/default (area-stats acfg) key #f)
		    (let ((newstats (make-stat)))
		      (hash-table-set! (area-stats acfg) key newstats)
		      newstats))))
    ;; when the last query happended (used to remove the fname from the active list)
    (stat-when-set! stats (current-seconds))
    ;; last values
    (stat-last-qcount-set! stats numqueries)
    (stat-last-qtime-set!  stats duration)
    ;; total over process lifetime
    (stat-qcount-set! stats (+ (stat-qcount stats) numqueries))
    (stat-qtime-set!  stats (+ (stat-qtime  stats) duration))
    ;; coarse average
    (stat-qcount-avg-set! stats (/ (+ (stat-qcount-avg stats) numqueries) 2))
    (stat-qtime-avg-set!  stats (/ (+ (stat-qtime-avg  stats) duration)   2))

    ;; here is where we add the stats for a given dbfile
    (if (not (member fname (stat-dbs stats)))
	(stat-dbs-set! stats (cons fname (stat-dbs stats))))

    ))

;;======================================================================
;; S E R V E R   S T U F F 
;; network utilities
;;======================================================================

;; this does NOT return!
;;
(define (find-free-port-and-open acfg)
  (let ((port (or (area-port acfg) 3200)))
    (handle-exceptions
	exn
	(begin
	  (print "INFO: cannot bind to port " (rpc:default-server-port) ", trying next port")
	  (area-port-set! acfg (+ port 1))
	  (find-free-port-and-open acfg))
      (rpc:default-server-port port)
      (area-port-set! acfg port)
      (tcp-read-timeout 120000)
      ;; ((rpc:make-server (tcp-listen port)) #t)
      (tcp-listen (rpc:default-server-port)
      ))))

;; register this node by putting a packet into the pkts dir.
;; look for other servers
;; contact other servers and compile list of servers
;; there are two types of server
;;     main servers - dashboards, runners and dedicated servers - need pkt
;;     passive servers - test executers, step calls, list-runs - no pkt
;;
(define (register-node acfg hostip port-num)
  ;;(mutex-lock! (area-mutex acfg))
  (let* ((server-type  (area-server-type acfg)) ;; auto, main, passive (no pkt created)
	 (best-ip      (or hostip (get-my-best-address)))
	 (mtdir        (area-dbdir acfg))
	 (pktdir       (area-pktsdir acfg))) ;; conc mtdir "/.server-pkts")))
    (print "Registering node " best-ip ":" port-num)
    (if (not mtdir) ;; require a home for this node to put or find databases
	#f
	(begin
	  (if  (not (directory? pktdir))(create-directory pktdir))
	  ;; server is started, now create pkt if needed
	  (print "Starting server in " server-type " mode with port " port-num)
	  (if (member server-type '(auto main)) ;; TODO: if auto, count number of servers registers, if > 3 then don't put out a pkt
	      (begin
		(area-pktid-set! acfg
				 (write-alist->pkt
				  pktdir 
				  `((hostname . ,(get-host-name))
				    (ipaddr   . ,best-ip)
				    (port     . ,port-num)
				    (pid      . ,(current-process-id)))
				  pktspec: *pktspec*
				  ptype:   'server))
		(area-pktfile-set! acfg (conc pktdir "/" (area-pktid acfg) ".pkt"))))
	  (area-port-set!    acfg port-num)
	  #;(mutex-unlock! (area-mutex acfg))))))

(define *cookie-seqnum* 0)
(define (make-cookie key)
  (set! *cookie-seqnum* (add1 *cookie-seqnum*))
  ;;(print "MAKE COOKIE CALLED -- on "servkey"-"*cookie-seqnum*)
  (conc key "-" *cookie-seqnum*)
  )

;; dispatch locally if possible
;;
(define (call-deliver-response acfg ipaddr port cookie data)
  (if (and (equal? (area-myaddr acfg) ipaddr)
	   (equal? (area-port     acfg) port))
      (deliver-response acfg cookie data)
      ((rpc:procedure 'response ipaddr port) cookie data)))

(define (deliver-response acfg cookie data)
  (let ((deliver-response-start (current-milliseconds)))
    (thread-start! (make-thread
		    (lambda ()
		      (let loop ((tries-left 5))
			;;(print "TOP OF DELIVER_RESPONSE LOOP; triesleft="tries-left)
			;;(pp (hash-table->alist (area-cookie2mbox acfg)))
			(let* ((mbox (hash-table-ref/default (area-cookie2mbox acfg) cookie #f)))
			  (cond
			   ((eq? 0 tries-left)
			    (print "ulex:deliver-response: I give up. Mailbox never appeared. cookie="cookie)
			    )
			   (mbox
			    ;;(print "got mbox="mbox"  got data="data"  send.")
			    (mailbox-send! mbox data))
			   (else
			    ;;(print "no mbox yet.  look for "cookie)
			    (thread-sleep! (/ (- 6 tries-left) 10))
			    (loop (sub1 tries-left))))))
		      ;; (debug-pp (list (conc "ulex:deliver-response took " (- (current-milliseconds) deliver-response-start) " ms, cookie=" cookie " data=") data))
		      (sdbg> "deliver-response" "mailbox-send" deliver-response-start #f #f cookie)
		      )
		    (conc "deliver-response thread for cookie="cookie))))
  #t)

;; action:
;;   immediate - quick actions, no need to put in queues
;;   dbwrite   - put in dbwrite queue
;;   dbread    - put in dbread queue
;;   oslong    - os actions, e.g. du, that could take a long time
;;   osshort   - os actions that should be quick, e.g. df
;;
(define (request acfg from-ipaddr from-port servkey action cookie fname params) ;; std-peer-handler
  ;; NOTE: Use rpc:current-peer for getting return address
  (let* ((std-peer-handler-start (current-milliseconds))
	 ;; (raw-data               (alist-ref 'data     dat))
	 (rdat                   (hash-table-ref/default
				  (area-rtable acfg) action #f)) ;; this looks up the sql query or other details indexed by the action
	 (witem                  (make-witem ripaddr: from-ipaddr ;; rhost:   from-host   
					     rport:   from-port   action:  action
					     rdat:    rdat        cookie:  cookie
					     servkey: servkey     data:    params ;; TODO - rename data to params
					     caller:  (rpc:current-peer))))
    (if (not (equal? servkey (area-pktid acfg)))
	`(#f . ,(conc "I don't know you servkey=" servkey ", pktid=" (area-pktid acfg))) ;; immediately return this
	(let* ((ctype (if rdat 
			  (calldat-ctype rdat) ;; is this necessary? these should be identical
			  action)))
	  (sdbg> "std-peer-handler" "immediate" std-peer-handler-start #f #f)
	  (case ctype
	    ;; (dbwrite acfg rdat (cons from-ipaddr from-port) data)))
	    ((full-ping)  `(#t  "ack to full ping"        ,(work-queue-add acfg fname witem) ,cookie))
	    ((response)   `(#t  "ack from requestor"      ,(deliver-response acfg fname params)))
	    ((dbwrite)    `(#t  "db write submitted"      ,(work-queue-add acfg fname witem) ,cookie))
	    ((dbread)     `(#t  "db read submitted"       ,(work-queue-add acfg fname witem) ,cookie  ))
	    ((dbrw)       `(#t  "db read/write submitted" ,cookie))
	    ((osshort)    `(#t  "os short submitted"      ,cookie))
	    ((oslong)     `(#t  "os long submitted"       ,cookie))
	    (else         `(#f  "unrecognised action"     ,ctype)))))))

;; Call this to start the actual server
;;
;; start_server
;;
;;   mode: '
;;   handler: proc which takes pktrecieved as argument
;;

(define (start-server acfg)
  (let* ((conn (find-free-port-and-open acfg))
	 (port (area-port acfg)))
    (rpc:publish-procedure!
     'delist-db
     (lambda (fname)
       (hash-table-delete! (area-dbs acfg) fname)))
    (rpc:publish-procedure!
     'calling-addr
     (lambda ()
       (rpc:current-peer)))
    (rpc:publish-procedure!
     'ping
     (lambda ()(real-ping acfg)))
    (rpc:publish-procedure!
     'request
     (lambda (from-addr from-port servkey action cookie dbname params)
       (request acfg from-addr from-port servkey action cookie dbname params)))
    (rpc:publish-procedure!
     'response
     (lambda (cookie res-dat)
       (deliver-response acfg cookie res-dat)))
    (area-ready-set! acfg #t)
    (area-conn-set! acfg conn)
    ((rpc:make-server conn) #f)));; ((tcp-listen (rpc:default-server-port)) #t)


(define (launch acfg) ;;  #!optional (proc std-peer-handler))
  (print "starting launch")
  (update-known-servers acfg) ;; gotta do this on every start (thus why limit number of publicised servers)
  #;(let ((original-handler (current-exception-handler))) ;; is th
    (lambda (exception)
      (server-exit-procedure)
      (original-handler exception)))
  (on-exit (lambda ()
	     (shutdown acfg))) ;; (finalize-all-db-handles acfg)))
  ;; set up the rpc handler
  (let* ((th1  (make-thread
		(lambda ()(start-server acfg))
		"server thread"))
	 (th2   (make-thread
		 (lambda ()
		   (print "th2 starting")
		   (let loop ()
		     (work-queue-processor acfg)
		     (print "work-queue-processor crashed!")
		     (loop)))
		 "work queue thread")))
    (thread-start! th1)
    (thread-start! th2)
    (let loop ()
      (thread-sleep! 0.025)
      (if (area-ready acfg)
	  #t
	  (loop)))
    ;; attempt to fix my address
    (let* ((all-addr (get-all-ips-sorted)))	     ;; could use (tcp-addresses conn)?
      (let loop ((rem-addrs all-addr))
	(if (null? rem-addrs)
	    (begin
	      (print "ERROR: Failed to figure out the ip address of myself as a server. Giving up.")
	      (exit 1)) ;; BUG Changeme to raising an exception
		
	    (let* ((addr      (car rem-addrs))
		   (good-addr (handle-exceptions
				  exn
				  #f
				((rpc:procedure 'calling-addr addr (area-port acfg))))))
	      (if good-addr
		  (begin
		    (print "Got good-addr of " good-addr)
		    (area-myaddr-set! acfg good-addr))
		  (loop (cdr rem-addrs)))))))
    (register-node acfg (area-myaddr acfg)(area-port acfg))
    (print "INFO: Server started on " (area-myaddr acfg) ":" (area-port acfg))
    ;; (update-known-servers acfg) ;; gotta do this on every start (thus why limit number of publicised servers)
    ))

(define (clear-server-pkt acfg)
  (let ((pktf (area-pktfile acfg)))
    (if pktf (delete-file* pktf))))

(define (shutdown acfg)
  (let (;;(conn (area-conn    acfg))
	(pktf (area-pktfile acfg))
	(port (area-port    acfg)))
    (if pktf (delete-file* pktf))
    (send-all "imshuttingdown")
    ;; (rpc:close-all-connections!) ;; don't know if this is actually needed
    (finalize-all-db-handles acfg)))

(define (send-all msg)
  #f)

;; given a area record look up all the packets
;;
(define (get-all-server-pkts acfg)
  (let ((all-pkt-files (glob (conc (area-pktsdir acfg) "/*.pkt"))))
    (map (lambda (pkt-file)
	   (read-pkt->alist pkt-file pktspec: *pktspec*))
	 all-pkt-files)))

#;((Z . "9a0212302295a19610d5796fce0370fa130758e9")
  (port . "34827")
  (pid . "28748")
  (hostname . "zeus")
  (T . "server")
  (D . "1549427032.0"))

#;(define (get-my-best-address)
  (let ((all-my-addresses (get-all-ips))) ;; (vector->list (hostinfo-addresses (hostname->hostinfo (get-host-name))))))
    (cond
     ((null? all-my-addresses)
      (get-host-name))                                          ;; no interfaces?
     ((eq? (length all-my-addresses) 1)
      (ip->string (car all-my-addresses)))                      ;; only one to choose from, just go with it
     (else 
      (ip->string (car (filter (lambda (x)                      ;; take any but 127.
				 (not (eq? (u8vector-ref x 0) 127)))
			       all-my-addresses)))))))

;; whoami? I am my pkt
;;
(define (whoami? acfg)
  (hash-table-ref/default (area-hosts acfg)(area-pktid acfg) #f))

;;======================================================================
;; "Client side" operations
;;======================================================================

(define (safe-call call-key host port . params)
  (handle-exceptions
   exn
   (begin
     (print "Call " call-key " to " host ":" port " failed")
     #f)
   (apply (rpc:procedure call-key host port) params)))

;; ;; convert to/from string / sexpr
;; 
;; (define (string->sexpr str)
;;   (if (string? str)
;;       (with-input-from-string str read)
;;       str))
;; 
;; (define (sexpr->string s)
;;   (with-output-to-string (lambda ()(write s))))

;; is the server alive?
;;
(define (ping acfg host port)
  (let* ((myaddr     (area-myaddr acfg))
	 (myport     (area-port   acfg))
	 (start-time (current-milliseconds))
	 (res        (if (and (equal? myaddr host)
			      (equal? myport port))
			 (real-ping acfg)
			 ((rpc:procedure 'ping host port)))))
    (cons (- (current-milliseconds) start-time)
	  res)))

;; returns ( ipaddr port alist-fname=>randnum )
(define (real-ping acfg)
  `(,(area-myaddr acfg) ,(area-port acfg) ,(get-host-stats acfg)))

;; is the server alive AND the queues processing?
;;
#;(define (full-ping acfg servpkt)
  (let* ((start-time (current-milliseconds))
	 (res        (send-message acfg servpkt '(full-ping) 'full-ping)))
    (cons (- (current-milliseconds) start-time)
	  res))) ;; (equal? res "got ping"))))


;; look up all pkts and get the server id (the hash), port, host/ip
;; store this info in acfg
;; return the number of responsive servers found
;;
;; DO NOT VERIFY THAT THE SERVER IS ALIVE HERE. This is called at times where the current server is not yet alive and cannot ping itself
;;
(define (update-known-servers acfg)
  ;; readll all pkts
  ;; foreach pkt; if it isn't me ping the server; if alive, add to hosts hash, else rm the pkt
  (let* ((start-time (current-milliseconds))
	 (all-pkts  (delete-duplicates
		     (append (get-all-server-pkts acfg)
			     (hash-table-values (area-hosts acfg)))))
	 (hostshash (area-hosts acfg))
	 (my-id     (area-pktid acfg))
	 (pktsdir   (area-pktsdir acfg)) ;; needed to remove pkts from non-responsive servers
	 (numsrvs   0)
	 (delpkt    (lambda (pktsdir sid)
		      (print "clearing out server " sid)
		      (delete-file* (conc pktsdir "/" sid ".pkt"))
		      (hash-table-delete! hostshash sid))))
    (area-last-srvup-set! acfg (current-seconds))
    (for-each
     (lambda (servpkt)
       (if (list? servpkt)
	   ;; (pp servpkt)
	   (let* ((shost (alist-ref 'ipaddr servpkt))
		  (sport (any->number (alist-ref 'port servpkt)))
		  (res   (handle-exceptions
			  exn
			  (begin
			    ;; (print "INFO: bad server on " shost ":" sport)
			    #f)
			  (ping acfg shost sport)))
		  (sid   (alist-ref 'Z servpkt)) ;; Z code is our name for the server
		  (url   (conc shost ":" sport))
		  )
	     #;(if (or (not res)
		     (null? res))
		 (begin
		   (print "STRANGE: ping of " url " gave " res)))
	     
	     ;; (print "Got " res " from " shost ":" sport)
	     (match res
		    ((qduration . payload)
		     ;; (print "Server pkt:" (alist-ref 'ipaddr servpkt) ":" (alist-ref 'port servpkt)
		     ;;        (if payload
		     ;;            "Success" "Fail"))
		     (match payload
			    ((host port stats)
			     ;; (print "From " host ":" port " got stats: " stats)
			     (if (and host port stats)
				 (let ((url (conc host ":" port)))
				   (hash-table-set! hostshash sid servpkt)
				   ;; store based on host:port
				   (hash-table-set! (area-hoststats acfg) sid stats))
				 (print "missing data from the server, not sure what that means!"))
			     (set! numsrvs (+ numsrvs 1)))
			    (#f
			     (print "Removing pkt " sid " due to #f from server or failed ping")
			     (delpkt pktsdir sid))
			    (else
			     (print "Got ")(pp res)(print " from server ")(pp servpkt) " but response did not match (#f/#t . msg)")))
		    (else
		     ;; here we delete the pkt - can't reach the server, remove it
		     ;; however this logic is inadequate. we should mark the server as checked
		     ;; and not good, if it happens a second time - then remove the pkt
		     ;; or something similar. I.e. don't be too quick to assume the server is wedged or dead
		     ;; could be it is simply too busy to reply
		     (let ((bad-pings (hash-table-ref/default (area-health acfg) url 0)))
		       (if (> bad-pings 1) ;; two bad pings - remove pkt
			   (begin
			     (print "INFO: " bad-pings " bad responses from " url ", deleting pkt " sid)
			     (delpkt pktsdir sid))
			   (begin
			     (print "INFO: " bad-pings " bad responses from " shost ":" sport " not deleting pkt yet")
			     (hash-table-set! (area-health acfg)
					      url
					      (+ (hash-table-ref/default (area-health acfg) url 0) 1))
			     ))
		       ))))
	   ;; servpkt is not actually a pkt?
	   (begin
	     (print "Bad pkt " servpkt))))
     all-pkts)
    (sdbg> "update-known-servers" "end" start-time #f #f " found " numsrvs
	   " servers, pkts: " (map (lambda (p)
				     (alist-ref 'Z p))
				   all-pkts))
    numsrvs))

(defstruct srvstat
  (numfiles 0)   ;; number of db files handled by this server - subtract 1 for the db being currently looked at
  (randnum  #f)  ;; tie breaker number assigned to by the server itself - applies only to the db under consideration
  (pkt      #f)) ;; the server pkt

;;(define (srv->srvstat srvpkt)
  
;; Get the server best for given dbname and key
;;
;;   NOTE: key is not currently used. The key points to the kind of query, this may be useful for directing read-only queries.
;;
(define (get-best-server acfg dbname key)
  (let* (;; (servers (hash-table-values (area-hosts acfg)))
	 (servers     (area-hosts acfg))
	 (skeys       (sort (hash-table-keys servers) string>=?)) ;; a stable listing
	 (start-time  (current-milliseconds))
	 (srvstats    (make-hash-table))  ;; srvid => srvstat
	 (url         (conc (area-myaddr acfg) ":" (area-port acfg))))
    ;; (print "scores for " dbname ": " (map (lambda (k)(cons k (calc-server-score acfg dbname k))) skeys))
    (if (null? skeys)
	(if (> (update-known-servers acfg) 0)
	    (get-best-server acfg dbname key) ;; some risk of infinite loop here, TODO add try counter
	    (begin
	      (print "ERROR: no server found!") ;; since this process is also a server this should never happen
	      #f))
	(begin
	  ;; (print "in get-best-server with skeys=" skeys)
	  (if (> (- (current-seconds) (area-last-srvup acfg)) 10)
	      (begin
		(update-known-servers acfg)
		(sdbg> "get-best-server" "update-known-servers" start-time #f #f)))

	  ;; for each server look at the list of dbfiles, total number of dbs being handled
	  ;; and the rand number, save the best host
	  ;; also do a delist-db for each server dbfile not used
	  (let* ((best-server       #f)
		 (servers-to-delist (make-hash-table)))
	    (for-each
	     (lambda (srvid)
	       (let* ((server    (hash-table-ref/default servers srvid #f))
		      (stats     (hash-table-ref/default (area-hoststats acfg) srvid '(()))))
		 ;; (print "stats: " stats)
 		 (if server
		     (let* ((dbweights (car stats))
			    (srvload   (length (filter (lambda (x)(not (equal? dbname (car x)))) dbweights)))
			    (dbrec     (alist-ref dbname dbweights equal?))  ;; get the pair with fname . randscore
			    (randnum   (if dbrec
					   dbrec ;; (cdr dbrec)
					   0)))
		       (hash-table-set! srvstats srvid (make-srvstat numfiles: srvload randnum: randnum pkt: server))))))
	     skeys)
	    
	    (let* ((sorted    (sort (hash-table-values srvstats) 
				    (lambda (a b)
				      (let ((numfiles-a (srvstat-numfiles a))
					    (numfiles-b (srvstat-numfiles b))
					    (randnum-a  (srvstat-randnum a))
					    (randnum-b  (srvstat-randnum b)))
					(if (< numfiles-a numfiles-b) ;; Note, I don't think adding an offset works here. Goal was only move file handling to a different server if it has 2 less
					    #t
					    (if (and (equal? numfiles-a numfiles-b)
						     (< randnum-a randnum-b))
						#t
						#f))))))
		   (best      (if (null? sorted)
				  (begin
				    (print "ERROR: should never be null due to self as server.")
				    #f)
				  (srvstat-pkt (car sorted)))))
	      #;(print "SERVER(" url "): " dbname ": " (map (lambda (srv)
							    (let ((p (srvstat-pkt srv)))
							      (conc (alist-ref 'ipaddr p) ":" (alist-ref 'port p)
								    "(" (srvstat-numfiles srv)","(srvstat-randnum srv)")")))
							    sorted))
	      best))))))
    
    ;; send out an "I'm about to exit notice to all known servers"
    ;;
(define (death-imminent acfg)
  '())

;;======================================================================
;; U L E X  -  T H E   I N T E R E S T I N G   S T U F F ! !
;;======================================================================

;; register a handler
;;   NOTES:
;;     dbinitsql   is reserved for a list of sql statements for initializing the db
;;     dbinitfn    is reserved for a db init function, if exists called after dbinitsql
;;     
(define (register acfg key obj #!optional (ctype 'dbwrite))
  (let ((ht (area-rtable acfg)))
    (if (hash-table-exists? ht key)
	(print "WARNING: redefinition of entry " key))
    (hash-table-set! ht key (make-calldat obj: obj ctype: ctype))))

;; usage: register-batch acfg '((key1 . sql1) (key2 . sql2) ... )
;; NB// obj is often an sql query
;;
(define (register-batch acfg ctype data)
  (let ((ht (area-rtable acfg)))
    (map (lambda (dat)
	   (hash-table-set! ht (car dat)(make-calldat obj: (cdr dat) ctype: ctype)))
	 data)))

(define (initialize-area-calls-from-specfile area specfile)
  (let* ((callspec (with-input-from-file specfile read )))
    (for-each (lambda (group)
                (register-batch
                 area
                 (car group)
                 (cdr group)))
              callspec)))

;; get-rentry
;;
(define (get-rentry acfg key)
  (hash-table-ref/default (area-rtable acfg) key #f))

(define (get-rsql acfg key)
  (let ((cdat (get-rentry acfg key)))
    (if cdat
	(calldat-obj cdat)
	#f)))



;; blocking call:
;;    client                         server
;;    ------                         ------
;;    call()
;;    send-message()
;;    nmsg-send()
;;                                   nmsg-receive()
;;                                   nmsg-respond(ack,cookie)
;;    ack, cookie
;;    mbox-thread-wait(cookie)
;;                                   nmsg-send(client,cookie,result)
;;        nmsg-respond(ack)
;;        return result
;;
;; reserved action:
;;    'immediate
;;    'dbinitsql
;;
(define (call acfg dbname action params #!optional (count 0))
  (let* ((call-start-time     (current-milliseconds))
	 (srv                 (get-best-server acfg dbname action))
	 (post-get-start-time (current-milliseconds))
	 (rdat                (hash-table-ref/default (area-rtable acfg) action #f))
	 (myid                (trim-pktid (area-pktid acfg)))
	 (srvid               (trim-pktid (alist-ref 'Z srv)))
	 (cookie              (make-cookie myid)))
    (sdbg> "call" "get-best-server" call-start-time #f call-start-time " from: " myid " to server: " srvid " for " dbname " action: " action " params: " params " rdat: " rdat)
    (print "INFO: call to " (alist-ref 'ipaddr srv) ":" (alist-ref 'port srv) " from " (area-myaddr acfg) ":" (area-port acfg) " for " dbname)
    (if (and srv rdat) ;; need both to dispatch a request
	(let* ((ripaddr  (alist-ref 'ipaddr srv))
	       (rsrvid   (alist-ref 'Z srv))
	       (rport    (any->number (alist-ref 'port   srv)))
	       (res-full (if (and (equal? ripaddr (area-myaddr acfg))
				  (equal? rport   (area-port acfg)))
			     (request acfg ripaddr rport (area-pktid acfg) action cookie dbname params)
			     (safe-call 'request ripaddr rport
					(area-myaddr acfg)
					(area-port   acfg)
					#;(area-pktid acfg)
					rsrvid
					action cookie dbname params))))
	  ;; (print "res-full: " res-full)
	  (match res-full
	    ((response-ok response-msg rem ...)
	     (let* ((send-message-time (current-milliseconds))
		    ;; (match res-full
		    ;;  ((response-ok response-msg)
		    ;; (response-ok  (car res-full))
		    ;; (response-msg (cadr res-full)
		    )
	       ;; (res (take res-full 3))) ;; ctype == action, TODO: converge on one term <<=== what was this? BUG 
	       ;; (print "ulex:call: send-message took " (- send-message-time post-get-start-time) " ms params=" params)
	       (sdbg> "call" "send-message" post-get-start-time #f call-start-time)
	       (cond
		((not response-ok) #f)
		((member response-msg '("db read submitted" "db write submitted"))
		 (let* ((cookie-id   (cadddr res-full))
			(mbox        (make-mailbox))
			(mbox-time   (current-milliseconds)))
		   (hash-table-set! (area-cookie2mbox acfg) cookie-id mbox)
		   (let* ((mbox-timeout-secs    20)
			  (mbox-timeout-result 'MBOX_TIMEOUT)
			  (res                  (mailbox-receive! mbox mbox-timeout-secs mbox-timeout-result))
			  (mbox-receive-time    (current-milliseconds)))
		     (hash-table-delete! (area-cookie2mbox acfg) cookie-id)
		     (sdbg> "call" "mailbox-receive" mbox-time #f call-start-time " from: " myid " to server: " srvid " for " dbname)
		     ;; (print "ulex:call mailbox-receive took " (- mbox-receive-time mbox-time) "ms params=" params)
		     res)))
		(else
		 (print "Unhandled response \""response-msg"\"")
		 #f))
	       ;; depending on what action (i.e. ctype) is we will block here waiting for
	       ;; all the data (mechanism to be determined)
	       ;;
	       ;; if res is a "working on it" then wait
	       ;;    wait for result
	       ;; mailbox thread wait on 
	       
	       ;; if res is a "can't help you" then try a different server
	       ;; if res is a "ack" (e.g. for one-shot requests) then return res
	       ))
	    (else
	     (if (< count 10)
		 (let* ((url (conc (alist-ref 'ipaddr srv) ":" (alist-ref 'port srv))))
		   (thread-sleep! 1)
		   (print "ERROR: Bad result from " url ", dbname: " dbname ", action: " action ", params: " params ". Trying again in 1 second.")
		   (call acfg dbname action params (+ count 1)))
		 (begin
		   (error (conc "ERROR: " count " tries, still have improper response res-full=" res-full)))))))
	(begin
	  (if (not rdat)
	      (print "ERROR: action " action " not registered.")
	      (if (< count 10)
		 (begin
		   (thread-sleep! 1)
		   (area-hosts-set! acfg (make-hash-table)) ;; clear out all known hosts
		   (print "ERROR: no server found, srv=" srv ", trying again in 1 seconds")
		   (call acfg dbname action params (+ count 1)))
		 (begin
		   (error (conc "ERROR: no server found after 10 tries, srv=" srv ", giving up."))
		   #;(error "No server available"))))))))


;;======================================================================
;; U T I L I T I E S 
;;======================================================================

;; get a signature for identifing this process
;;
(define (get-process-signature)
  (cons (get-host-name)(current-process-id)))

;;======================================================================
;; S Y S T E M   S T U F F
;;======================================================================

;; get normalized cpu load by reading from /proc/loadavg and
;; /proc/cpuinfo return all three values and the number of real cpus
;; and the number of threads returns alist '((adj-cpu-load
;; . normalized-proc-load) ... etc.  keys: adj-proc-load,
;; adj-core-load, 1m-load, 5m-load, 15m-load
;;
(define (get-normalized-cpu-load)
  (let ((res (get-normalized-cpu-load-raw))
	(default `((adj-proc-load . 2) ;; there is no right answer
		   (adj-core-load . 2)
		   (1m-load       . 2)
		   (5m-load       . 0) ;; causes a large delta - thus causing default of throttling if stuff goes wrong
		   (15m-load      . 0)
		   (proc          . 1)
		   (core          . 1)
		   (phys          . 1)
		   (error         . #t))))
    (cond
     ((and (list? res)
	   (> (length res) 2))
      res)
     ((eq? res #f)   default) ;; add messages?
     ((eq? res #f) default)   ;; this would be the #eof
     (else default))))

(define (get-normalized-cpu-load-raw)
(define (rate-ip ipaddr)
  (let* ((actual-host           (get-host-name))) ;; #f is localhost
    (let ((data  (append 
		  (with-input-from-file "/proc/loadavg" read-lines)
		  (with-input-from-file "/proc/cpuinfo" read-lines)
		  (list "end")))
	  (load-rx  (regexp "^([\\d\\.]+)\\s+([\\d\\.]+)\\s+([\\d\\.]+)\\s+.*$"))
	  (proc-rx  (regexp "^processor\\s+:\\s+(\\d+)\\s*$"))
	  (core-rx  (regexp "^core id\\s+:\\s+(\\d+)\\s*$"))
	  (phys-rx  (regexp "^physical id\\s+:\\s+(\\d+)\\s*$"))
	  (max-num  (lambda (p n)(max (string->number p) n))))
      ;; (print "data=" data)
      (if (null? data) ;; something went wrong
	  #f
	  (let loop ((hed      (car data))
		     (tal      (cdr data))
		     (loads    #f)
		     (proc-num 0)  ;; processor includes threads
		     (phys-num 0)  ;; physical chip on motherboard
		     (core-num 0)) ;; core
	    ;; (print hed ", " loads ", " proc-num ", " phys-num ", " core-num)
	    (if (null? tal) ;; have all our data, calculate normalized load and return result
		(let* ((act-proc (+ proc-num 1))
		       (act-phys (+ phys-num 1))
		       (act-core (+ core-num 1))
		       (adj-proc-load (/ (car loads) act-proc))
		       (adj-core-load (/ (car loads) act-core))
		       (result
			(append (list (cons 'adj-proc-load adj-proc-load)
				      (cons 'adj-core-load adj-core-load))
				(list (cons '1m-load (car loads))
				      (cons '5m-load (cadr loads))
				      (cons '15m-load (caddr loads)))
				(list (cons 'proc act-proc)
				      (cons 'core act-core)
				      (cons 'phys act-phys)))))
		  result)
		(regex-case
  (regex-case ipaddr
		    hed
		  (load-rx  ( x l1 l5 l15 ) (loop (car tal)(cdr tal)(map string->number (list l1 l5 l15)) proc-num phys-num core-num))
		  (proc-rx  ( x p         ) (loop (car tal)(cdr tal) loads           (max-num p proc-num) phys-num core-num))
		  (phys-rx  ( x p         ) (loop (car tal)(cdr tal) loads           proc-num (max-num p phys-num) core-num))
		  (core-rx  ( x c         ) (loop (car tal)(cdr tal) loads           proc-num phys-num (max-num c core-num)))
		  (else 
		   (begin
		     ;; (print "NO MATCH: " hed)
		     (loop (car tal)(cdr tal) loads proc-num phys-num core-num))))))))))

    ( "^127\\..*" _ 0 )
(define (get-host-stats acfg)
  (let ((stats-hash (area-stats acfg)))
    ;; use this opportunity to remove references to dbfiles which have not been accessed in a while
    (for-each
     (lambda (dbname)
       (let* ((stats       (hash-table-ref stats-hash dbname))
	      (last-access (stat-when stats)))
	 (if (and (> last-access 0)                             ;; if zero then there has been no access
		  (> (- (current-seconds) last-access) 10))     ;; not used in ten seconds
	     (begin
	       (print "Removing " dbname " from stats list")
	       (hash-table-delete! stats-hash dbname) ;; remove from stats hash
	       (stat-dbs-set! stats (hash-table-keys stats))))))
     (hash-table-keys stats-hash))
    
    ( "^(10\\.0|192\\.168)\\..*" _ 1 )
    `(,(hash-table->alist (area-dbs acfg)) ;; dbname => randnum
      ,(map (lambda (dbname)  ;; dbname is the db name
	      (cons dbname (stat-when (hash-table-ref stats-hash dbname))))
	    (hash-table-keys stats-hash))
      (cpuload . ,(get-normalized-cpu-load)))))
    #;(stats   . ,(map (lambda (k) ;; create an alist from the stats data
		       (cons k (stat->alist (hash-table-ref (area-stats acfg) k))))
		     (hash-table-keys (area-stats acfg))))

#;(trace
 ;; assv
 ;; cdr
 ;; caar
 ;; ;; cdr
 ;; call
 ;; finalize-all-db-handles
 ;; get-all-server-pkts
 ;; get-normalized-cpu-load
 ;; get-normalized-cpu-load-raw
 ;; launch
 ;; nmsg-send
 ;; process-db-queries
 ;; receive-message
 ;; std-peer-handler
 ;; update-known-servers
 ;; work-queue-processor
 )

;;======================================================================
;; netutil
;;   move this back to ulex-netutil.scm someday?
;;======================================================================

;; #include <stdio.h>
;; #include <netinet/in.h>
;; #include <string.h>
;; #include <arpa/inet.h>

(foreign-declare "#include \"sys/types.h\"")
(foreign-declare "#include \"sys/socket.h\"")
(foreign-declare "#include \"ifaddrs.h\"")
(foreign-declare "#include \"arpa/inet.h\"")

;; get IP addresses from ALL interfaces
(define get-all-ips
  (foreign-safe-lambda* scheme-object ()
    "

// from https://stackoverflow.com/questions/17909401/linux-c-get-default-interfaces-ip-address :


    C_word lst = C_SCHEME_END_OF_LIST, len, str, *a;
//    struct ifaddrs *ifa, *i;
//    struct sockaddr *sa;

    struct ifaddrs * ifAddrStruct = NULL;
    struct ifaddrs * ifa = NULL;
    void * tmpAddrPtr = NULL;

    if ( getifaddrs(&ifAddrStruct) != 0)
      C_return(C_SCHEME_FALSE);

//    for (i = ifa; i != NULL; i = i->ifa_next) {
    for (ifa = ifAddrStruct; ifa != NULL; ifa = ifa->ifa_next) {
        if (ifa->ifa_addr->sa_family==AF_INET) { // Check it is
            // a valid IPv4 address
            tmpAddrPtr = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
            char addressBuffer[INET_ADDRSTRLEN];
            inet_ntop(AF_INET, tmpAddrPtr, addressBuffer, INET_ADDRSTRLEN);
//            printf(\"%s IP Address %s\\n\", ifa->ifa_name, addressBuffer);
            len = strlen(addressBuffer);
            a = C_alloc(C_SIZEOF_PAIR + C_SIZEOF_STRING(len));
            str = C_string(&a, len, addressBuffer);
            lst = C_a_pair(&a, str, lst);
        } 

//        else if (ifa->ifa_addr->sa_family==AF_INET6) { // Check it is
//            // a valid IPv6 address
//            tmpAddrPtr = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
//            char addressBuffer[INET6_ADDRSTRLEN];
//            inet_ntop(AF_INET6, tmpAddrPtr, addressBuffer, INET6_ADDRSTRLEN);
////            printf(\"%s IP Address %s\\n\", ifa->ifa_name, addressBuffer);
//            len = strlen(addressBuffer);
//            a = C_alloc(C_SIZEOF_PAIR + C_SIZEOF_STRING(len));
//            str = C_string(&a, len, addressBuffer);
//            lst = C_a_pair(&a, str, lst);
//       }

//       else {
    ( else 2 ) ))
//         printf(\" not an IPv4 address\\n\");
//       }

    }

    freeifaddrs(ifa);
    C_return(lst);

"))

;; Change this to bias for addresses with a reasonable broadcast value?
;;
(define (ip-pref-less? a b)
  (let* ((rate (lambda (ipstr)
                 (regex-case ipstr
                             ( "^127\\." _ 0 )
                             ( "^(10\\.0|192\\.168\\.)\\..*" _ 1 )
                             ( else 2 ) ))))
    (< (rate a) (rate b))))
  (> (rate-ip a) (rate-ip b)))
  

(define (get-my-best-address)
  (let ((all-my-addresses (get-all-ips))
        ;;(all-my-addresses-old (vector->list (hostinfo-addresses (hostname->hostinfo (get-host-name)))))
        )
    (cond

     ;;    		       all-my-addresses))))

     )))

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

(define (get-all-ips)
  (map ip->string (vector->list 
		   (hostinfo-addresses
		    (host-information (current-hostname))))))

;; make it a global? Well, it is local to area module

(define *captain-pktspec*
  `((captain (host     . h)
	     (port     . p)
	     (pid      . i)
	     (ipaddr   . a)
	     )
    #;(data   (hostname . h)  ;; sender hostname
	    (port     . p)  ;; sender port
	    (ipaddr   . a)  ;; sender ip
	    (hostkey  . k)  ;; sending host key - store info at server under this key
	    (servkey  . s)  ;; server key - this needs to match at server end or reject the msg
	    (format   . f)  ;; sb=serialized-base64, t=text, sx=sexpr, j=json
	    (data     . d)  ;; base64 encoded slln data
	    )))

;; struct for keeping track of our world

(defstruct udat
  (captain-address #f)
  (captain-host    #f)
  (captain-port    #f)
  (captain-pid     #f)
  (cpkts-dir       (conc (get-environment-variable "HOME") "/.ulex/pkts"))
  (cpkt-spec       *captain-pktspec*)
  (my-cpkt-key     #f)   ;; put Z card here when I create a pkt for myself as captain
  (my-address      #f)
  (my-hostname     #f)
  (my-port         #f)
  (my-pid          (current-process-id))
  (serv-listener   #f)
  (handler-thread  #f)
  (handlers        (make-hash-table))
  (outgoing-conns  (make-hash-table))  ;; host:port -> conn
  )

;; struct for keeping track of others we are talking to

(defstruct peer
  (addr-port       #f)
  (hostname        #f)
  (pid             #f)
  (inp             #f)  ;; input port from the peer
  (oup             #f)  ;; output port to the peer
  (owns            '()) ;; list of databases this peer is currently handling
  )

;;======================================================================
;; Captain pkt functions
;;======================================================================

;; given a pkts dir read 
;;
(define (get-all-captain-pkts udata)
  (let* ((pktsdir       (let ((d (udat-cpkts-dir udata)))
			  (if (file-exists? d)
			      d
			      (begin
				(create-directory d #t)
				d))))
	 (all-pkt-files (glob (conc pktsdir "/*.pkt")))
	 (pkt-spec      (udat-cpkt-spec udata)))
    (map (lambda (pkt-file)
	   (read-pkt->alist pkt-file pktspec: pkt-spec))
	 all-pkt-files)))

;; sort by D then Z, return one, choose the oldest then
;; differentiate if needed using the Z key
;;l
(define (get-winning-pkt pkts)
  (if (null? pkts)
      #f
      (car (sort pkts (lambda (a b)
			(let ((ad (string->number (alist-ref 'D a)))
			      (bd (string->number (alist-ref 'D b))))
			  (if (eq? a b)
			      (let ((az (alist-ref 'Z a))
				    (bz (alist-ref 'Z b)))
				(string>=? az bz))
			      (> ad bd))))))))

;; create a tcp listener and return a populated udat struct with
;; my port, address, hostname, pid etc.
;; return #f if fail to find a port to allocate.
;;
(define (start-server-find-port udata #!optional (port 4242)) 
  (handle-exceptions
      exn
      (if (< port 65535)(start-server-find-port udata (+ port 1)) #f)
    (connect-server udata port)))

(define (connect-server udata 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-my-address-set!    udata addr)
    (udat-my-port-set!       udata port)
    (udat-my-hostname-set!   udata (get-host-name))
    (udat-serv-listener-set! udata tlsn)
    udata))

;; put the host, ip, port and pid into a pkt in
;; the captain pkts dir
;;  - assumes user has already fired up a server
;;    which will be in the udata struct
;;
(define (create-captain-pkt udata)
  (if (not (udat-serv-listener udata))
      (begin
	(print "ERROR: create-captain-pkt called with out a listener")
	#f)
      (let* ((pktdat `((port   . ,(udat-my-port udata))
		       (host   . ,(udat-my-hostname udata))
		       (ipaddr . ,(udat-my-address udata))
		       (pid    . ,(udat-my-pid     udata))))
	     (pktdir  (udat-cpkts-dir udata))
	     (pktspec (udat-cpkt-spec udata))
	     )
	(udat-my-cpkt-key-set!
	 udata
	 (write-alist->pkt
	  pktdir
	  pktdat
	  pktspec: pktspec
	  ptype:   'captain))
	(udat-my-cpkt-key udata))))

;; NB// This needs to be started in a thread
;;
;; setup to be a captain
;;   - start server
;;   - create pkt
;;   - start server port handler
;;
(define (setup-as-captain udata)
  (if (start-server-find-port udata) ;; puts the server in udata
      (if (create-captain-pkt udata)
	  (let* ((th (make-thread (lambda ()
				    (ulex-handler udata)) "Captain handler")))
	    (udat-handler-thread-set! udata th)
	    (thread-start! th))
	  #f)
      #f))

(define (get-peer-dat udata host-port #!optional (hostname #f)(pid #f))
  (let* ((pdat (or (hash-table-ref/default (udat-outgoing-conns udata) host-port #f)
		   (let ((npdat (make-peer addr-port: host-port)))
		     (if hostname (peer-hostname-set! npdat hostname))
		     (if pid (peer-pid-set! npdat pid))
		     (let-values (((ninp noup)(tcp-connect host-port)))
		       (peer-inp-set! npdat ninp)
		       (peer-oup-set! npdat noup))
		     (hash-table-set! (udat-outgoing-conns udata) host-port npdat)
		     npdat))))
    pdat))

(define (get-peer-ports udata host-port #!optional (hostname #f)(pid #f))
  (let ((pdat (get-peer-dat udata host-port hostname pid)))
    (values (peer-inp pdat)(peer-oup pdat))))

;; send back ack, amusing I suppose that this looks almost like what
;; tcp itself does ...
;;
(define (reply udata host-port handler qrykey data #!optional (hostname #f)(pid #f))
  (let-values (((inp oup)(get-peer-ports udata host-port hostname pid)))
    (write-line (conc
		 handler " "
		 (udat-my-address  udata) ":" (udat-my-port udata) " "
		 (udat-my-hostname udata) " "
		 (udat-my-pid      udata) " "
		 qrykey)
		oup)
    (write-line data oup))) ;; we must send a second line - for the ack let it be the qrykey 

(define (add-to-work-queue udata . blah)
  #f)

;; send back ack
;;
(define (send-ack udata host-port qrykey #!optional (hostname #f)(pid #f))
  (reply udata "ack" qrykey qrykey hostname pid)) ;; we must send a second line - for the ack let it be the qrykey 
  
;; 
;;
(define (ulex-handler udata)
  (let* ((serv-listener (udat-serv-listener udata)))
    (let-values (((inp oup)(tcp-accept serv-listener)))
      ;; data comes as two lines
      ;;   handlerkey resp-addr:resp-port hostname pid qrykey [dbpath/dbfile.db]
      ;;   data
      (let loop ((state 'start))
	(let* ((controldat (read-line inp))
	       (data       (read-line inp)))
	  (match (string-split controldat)
	    ((handlerkey host:port hostname pid qrykey params ...)
	     (case (string->symbol handlerkey)
	       ((ack)(print "Got ack!"))
	       ((ping)
		(let* ((proc (hash-table-ref/default (udat-handlers udata) 'ping #f))
		       (val  (if proc (proc) "gotping")))
		  (reply udata host:port "version" qrykey val)))
	       ((rucaptain)
		(reply udata host:port "iamcaptain" qrykey (if (udat-my-cpkt-key udata)
							       "yes"
							       "no")))
	       (else
		(send-ack udata host:port qrykey hostname pid)
		(add-to-work-queue udata (get-peer-dat udata host:port) handlerkey data)))
	     (else (print "BAD DATA? handler=" handlerkey " data=" data)))))
	(loop state)))))

;; add a proc to the handler list
(define (register-handler udata key proc)
  (hash-table-set! (udat-handlers udata) key proc))

;;======================================================================
;; connection setup and management functions
;;======================================================================

;; find or become the captain, return a ulex object
;;
(define (setup)
  (let* ((udata (make-udat))
	 (cpkts (get-all-captain-pkts udata)) ;; read captain pkts
	 (captn (get-winning-pkt cpkts)))
    (if captn
	(let* ((port   (alist-ref 'port   captn))
	       (host   (alist-ref 'host   captn))
	       (ipaddr (alist-ref 'ipaddr captn))
	       (pid    (alist-ref 'pid    captn)))
	  (udat-captain-address-set! udata ipaddr)
	  (udat-captain-host-set!    udata host)
	  (udat-captain-port-set!    udata port)
	  (udat-captain-pid-set!     udata pid)
	  ;;(if (ping-captain udata)
	  ;;    udata
	  ;;    (begin
	  ;;       (remove-captain-pkt udata captn)
	  ;;       (setup)))
	  udata)
	(setup-as-captain udata)) ;; this saves the thread to captain-thread and starts the thread
    ))
    
(define (connect udata dbfname)
  udata)

) ;; END OF ULEX


;;; ;;======================================================================
;;; ;; D E B U G   H E L P E R S
;;; ;;======================================================================
;;;     
;;; (define (dbg> . args)
;;;   (with-output-to-port (current-error-port)
;;;     (lambda ()
;;;       (apply print "dbg> " args))))
;;; 
;;; (define (debug-pp . args)
;;;   (if (get-environment-variable "ULEX_DEBUG")
;;;       (with-output-to-port (current-error-port)
;;; 	(lambda ()
;;; 	  (apply pp args)))))
;;; 
;;; (define *default-debug-port* (current-error-port))
;;; 
;;; (define (sdbg> fn stage-name stage-start stage-end start-time . message)
;;;   (if (get-environment-variable "ULEX_DEBUG")
;;;       (with-output-to-port *default-debug-port* 
;;; 	(lambda ()
;;; 	  (apply print "ulex:" fn " " stage-name " took " (- (if stage-end stage-end (current-milliseconds)) stage-start) " ms. "
;;; 		 (if start-time
;;; 		     (conc "total time " (- (current-milliseconds) start-time)
;;; 			   " ms.")
;;; 		     "")
;;; 		 message
;;; 		 )))))

;;======================================================================
;; M A C R O S
;;======================================================================
;; iup callbacks are not dumping the stack, this is a work-around
;;

;; Some of these routines use:
;;
;;     http://www.cs.toronto.edu/~gfb/scheme/simple-macros.html
;;
;; Syntax for defining macros in a simple style similar to function definiton,
;;  when there is a single pattern for the argument list and there are no keywords.
;;
;; (define-simple-syntax (name arg ...) body ...)
;;
;; 
;; (define-syntax define-simple-syntax
;;   (syntax-rules ()
;;     ((_ (name arg ...) body ...)
;;      (define-syntax name (syntax-rules () ((name arg ...) (begin body ...)))))))
;; 
;; (define-simple-syntax (catch-and-dump proc procname)
;;   (handle-exceptions
;;    exn
;;    (begin
;;      (print-call-chain (current-error-port))
;;      (with-output-to-port (current-error-port)
;;        (lambda ()
;;          (print ((condition-property-accessor 'exn 'message) exn))
;;          (print "Callback error in " procname)
;;          (print "Full condition info:\n" (condition->list exn)))))
;;    (proc)))
;; 
;; 
;;======================================================================
;;  R E C O R D S
;;======================================================================

;;; ;; information about me as a server
;;; ;;
;;; (defstruct area
;;;   ;; about this area
;;;   (useportlogger #f)
;;;   (lowport       32768)
;;;   (server-type   'auto)  ;; auto=create up to five servers/pkts, main=create pkts, passive=no pkt (unless there are no pkts at all)
;;;   (conn          #f)
;;;   (port          #f)
;;;   (myaddr        (get-my-best-address))
;;;   pktid          ;; get pkt from hosts table if needed
;;;   pktfile
;;;   pktsdir
;;;   dbdir
;;;   (dbhandles     (make-hash-table)) ;; fname => list-of-dbh, NOTE: Should really never need more than one?
;;;   (mutex         (make-mutex))
;;;   (rtable        (make-hash-table)) ;; registration table of available actions
;;;   (dbs           (make-hash-table)) ;; filename => random number, used for choosing what dbs I serve
;;;   ;; about other servers
;;;   (hosts         (make-hash-table)) ;; key => hostdat
;;;   (hoststats     (make-hash-table)) ;; key => alist of fname => ( qcount . qtime )
;;;   (reqs          (make-hash-table)) ;; uri => queue
;;;   ;; work queues
;;;   (wqueues       (make-hash-table)) ;; fname => qdat
;;;   (stats         (make-hash-table)) ;; fname => totalqueries
;;;   (last-srvup    (current-seconds)) ;; last time we updated the known servers
;;;   (cookie2mbox   (make-hash-table)) ;; map cookie for outstanding request to mailbox of awaiting call
;;;   (ready #f)
;;;   (health        (make-hash-table)) ;; ipaddr:port => num failed pings since last good ping
;;;   )
;;; 
;;; ;; host stats
;;; ;;
;;; (defstruct hostdat
;;;   (pkt      #f)
;;;   (dbload   (make-hash-table))  ;; "dbfile.db" => queries/min
;;;   (hostload #f)                 ;; normalized load ( 5min load / numcpus )
;;;   )
;;; 
;;; ;; dbdat
;;; ;;
;;; (defstruct dbdat
;;;   (dbh    #f)
;;;   (fname  #f)
;;;   (write-access #f)
;;;   (sths   (make-hash-table))  ;; hash mapping query strings to handles
;;;   )
;;; 
;;; ;; qdat
;;; ;;
;;; (defstruct qdat
;;;   (writeq  (make-queue))
;;;   (readq   (make-queue))
;;;   (rwq     (make-queue))
;;;   (logq    (make-queue)) ;; do we need a queue for logging? yes, if we use sqlite3 db for logging
;;;   (osshort (make-queue))
;;;   (oslong  (make-queue))
;;;   (misc    (make-queue)) ;; used for things like ping-full
;;;   )
;;; 
;;; ;; calldat
;;; ;;
;;; (defstruct calldat
;;;   (ctype 'dbwrite)
;;;   (obj   #f)              ;; this would normally be an SQL statement e.g. SELECT, INSERT etc.
;;;   (rtime (current-milliseconds)))
;;; 
;;; ;; make it a global? Well, it is local to area module
;;; 
;;; (define *pktspec*
;;;   `((server (hostname . h)
;;; 	    (port     . p)
;;; 	    (pid      . i)
;;; 	    (ipaddr   . a)
;;; 	    )
;;;     (data   (hostname . h)  ;; sender hostname
;;; 	    (port     . p)  ;; sender port
;;; 	    (ipaddr   . a)  ;; sender ip
;;; 	    (hostkey  . k)  ;; sending host key - store info at server under this key
;;; 	    (servkey  . s)  ;; server key - this needs to match at server end or reject the msg
;;; 	    (format   . f)  ;; sb=serialized-base64, t=text, sx=sexpr, j=json
;;; 	    (data     . d)  ;; base64 encoded slln data
;;; 	    )))
;;; 
;;; ;; work item
;;; ;;
;;; (defstruct witem
;;;   (rhost #f)   ;; return host
;;;   (ripaddr #f) ;; return ipaddr
;;;   (rport #f)   ;; return port
;;;   (servkey #f) ;; the packet representing the client of this workitem, used by final send-message
;;;   (rdat  #f)   ;; the request - usually an sql query, type is rdat
;;;   (action #f)  ;; the action: immediate, dbwrite, dbread,oslong, osshort
;;;   (cookie #f)  ;; cookie id for response
;;;   (data   #f)  ;; the data payload, i.e. parameters
;;;   (result #f)  ;; the result from processing the data
;;;   (caller #f)) ;; the calling peer according to rpc itself
;;; 
;;; (define (trim-pktid pktid)
;;;   (if (string? pktid)
;;;       (substring pktid 0 4)
;;;       "nopkt"))
;;; 
;;; (define (any->number num)
;;;   (cond
;;;    ((number? num) num)
;;;    ((string? num) (string->number num))
;;;    (else num)))
;;; 
;;; (use trace)
;;; (trace-call-sites #t)
;;; 
;;; ;;======================================================================
;;; ;; D A T A B A S E   H A N D L I N G 
;;; ;;======================================================================
;;; 
;;; ;; look in dbhandles for a db, return it, else return #f
;;; ;;
;;; (define (get-dbh acfg fname)
;;;   (let ((dbh-lst (hash-table-ref/default (area-dbhandles acfg) fname '())))
;;;     (if (null? dbh-lst)
;;; 	(begin
;;; 	  ;; (print "opening db for " fname)
;;; 	  (open-db acfg fname)) ;; Note that the handles get put back in the queue in the save-dbh calls
;;; 	(let ((rem-lst (cdr dbh-lst)))
;;; 	  ;; (print "re-using saved connection for " fname)
;;; 	  (hash-table-set! (area-dbhandles acfg) fname rem-lst)
;;; 	  (car dbh-lst)))))
;;; 
;;; (define (save-dbh acfg fname dbdat)
;;;     ;; (print "saving dbh for " fname)
;;;     (hash-table-set! (area-dbhandles acfg) fname (cons dbdat (hash-table-ref/default (area-dbhandles acfg) fname '()))))
;;; 
;;; ;; open the database, if never before opened init it. put the handle in the
;;; ;; open db's hash table
;;; ;; returns: the dbdat
;;; ;;
;;; (define (open-db acfg fname)
;;;   (let* ((fullname     (conc (area-dbdir acfg) "/" fname))
;;; 	 (exists       (file-exists? fullname))
;;; 	 (write-access (if exists
;;; 			   (file-write-access? fullname)
;;; 			   (file-write-access? (area-dbdir acfg))))
;;; 	 (db           (sqlite3:open-database fullname))
;;; 	 (handler      (sqlite3:make-busy-timeout 136000))
;;; 	 )
;;;     (sqlite3:set-busy-handler! db handler)
;;;     (sqlite3:execute db "PRAGMA synchronous = 0;")
;;;     (if (not exists) ;; need to init the db
;;; 	(if write-access
;;; 	    (let ((isql (get-rsql acfg 'dbinitsql))) ;; get the init sql statements
;;; 	      ;; (sqlite3:with-transaction
;;; 	      ;;  db
;;; 	      ;;  (lambda ()
;;; 		 (if isql
;;; 		     (for-each
;;; 		      (lambda (sql)
;;; 			(sqlite3:execute db sql))
;;; 		      isql)))
;;; 	    (print "ERROR: no write access to " (area-dbdir acfg))))
;;;     (make-dbdat dbh: db fname: fname write-access: write-access)))
;;; 
;;; ;; This is a low-level command to retrieve or to prepare, save and return a prepared statment
;;; ;; you must extract the db handle
;;; ;;
;;; (define (get-sth db cache stmt)
;;;   (if (hash-table-exists? cache stmt)
;;;       (begin
;;; 	;; (print "Reusing cached stmt for " stmt)
;;; 	(hash-table-ref/default cache stmt #f))
;;;       (let ((sth (sqlite3:prepare db stmt)))
;;; 	(hash-table-set! cache stmt sth)
;;; 	;; (print "prepared stmt for " stmt)
;;; 	sth)))
;;; 
;;; ;; a little more expensive but does all the tedious deferencing - only use if you don't already
;;; ;; have dbdat and db sitting around
;;; ;;
;;; (define (full-get-sth acfg fname stmt)
;;;   (let* ((dbdat  (get-dbh acfg fname))
;;; 	 (db     (dbdat-dbh dbdat))
;;; 	 (sths   (dbdat-sths dbdat)))
;;;     (get-sth db sths stmt)))
;;; 
;;; ;; write to a db
;;; ;; acfg: area data
;;; ;; rdat: request data
;;; ;; hdat: (host . port)
;;; ;;
;;; ;; (define (dbwrite acfg rdat hdat data-in)
;;; ;;   (let* ((dbname (car data-in))
;;; ;; 	 (dbdat  (get-dbh acfg dbname))
;;; ;; 	 (db     (dbdat-dbh dbdat))
;;; ;; 	 (sths   (dbdat-sths dbdat))
;;; ;; 	 (stmt   (calldat-obj rdat))
;;; ;; 	 (sth    (get-sth db sths stmt))
;;; ;; 	 (data   (cdr data-in)))
;;; ;;     (print "dbname: " dbname " acfg: " acfg " rdat: " (calldat->alist rdat) " hdat: " hdat " data: " data)
;;; ;;     (print "dbdat: " (dbdat->alist dbdat))
;;; ;;     (apply sqlite3:execute sth data)
;;; ;;     (save-dbh acfg dbname dbdat)
;;; ;;     #t
;;; ;;     ))
;;; 
;;; (define (finalize-all-db-handles acfg)
;;;   (let* ((dbhandles (area-dbhandles acfg))  ;; dbhandles is hash of fname ==> dbdat
;;; 	 (num       0))
;;;     (for-each
;;;      (lambda (area-name)
;;;        (print "Closing handles for " area-name)
;;;        (let ((dbdats (hash-table-ref/default dbhandles area-name '())))
;;; 	 (for-each
;;; 	  (lambda (dbdat)
;;; 	    ;; first close all statement handles
;;; 	    (for-each
;;; 	     (lambda (sth)
;;; 	       (sqlite3:finalize! sth)
;;; 	       (set! num (+ num 1)))
;;; 	     (hash-table-values (dbdat-sths dbdat)))
;;; 	    ;; now close the dbh
;;; 	    (set! num (+ num 1))
;;; 	    (sqlite3:finalize! (dbdat-dbh dbdat)))
;;; 	  dbdats)))
;;;      (hash-table-keys dbhandles))
;;;     (print "FINALIZED " num " dbhandles")))
;;; 
;;; ;;======================================================================
;;; ;; W O R K   Q U E U E   H A N D L I N G 
;;; ;;======================================================================
;;; 
;;; (define (register-db-as-mine acfg dbname)
;;;   (let ((ht (area-dbs acfg)))
;;;     (if (not (hash-table-ref/default ht dbname #f))
;;; 	(hash-table-set! ht dbname (random 10000)))))
;;; 	
;;; (define (work-queue-add acfg fname witem)
;;;   (let* ((work-queue-start (current-milliseconds))
;;; 	 (action           (witem-action witem)) ;; NB the action is the index into the rdat actions
;;; 	 (qdat             (or (hash-table-ref/default (area-wqueues acfg) fname #f)
;;; 			       (let ((newqdat (make-qdat)))
;;; 				 (hash-table-set! (area-wqueues acfg) fname newqdat)
;;; 				 newqdat)))
;;; 	 (rdat             (hash-table-ref/default (area-rtable acfg) action #f)))
;;;     (if rdat
;;; 	(queue-add!
;;; 	 (case (calldat-ctype rdat)
;;; 	   ((dbwrite)   (register-db-as-mine acfg fname)(qdat-writeq qdat))
;;; 	   ((dbread)    (register-db-as-mine acfg fname)(qdat-readq  qdat))
;;; 	   ((dbrw)      (register-db-as-mine acfg fname)(qdat-rwq    qdat))
;;; 	   ((oslong)    (qdat-oslong qdat))
;;; 	   ((osshort)   (qdat-osshort qdat))
;;; 	   ((full-ping) (qdat-misc  qdat))
;;; 	   (else
;;; 	    (print "ERROR: no queue for " action ". Adding to dbwrite queue.")
;;; 	    (qdat-writeq qdat)))
;;; 	 witem)
;;; 	(case action
;;; 	  ((full-ping)(qdat-misc qdat))
;;; 	  (else
;;; 	   (print "ERROR: No action " action " was registered"))))
;;;     (sdbg> "work-queue-add" "queue-add" work-queue-start #f #f)
;;;     #t)) ;; for now, simply return #t to indicate request got to the queue
;;; 
;;; (define (doqueue acfg q fname dbdat dbh)
;;;   ;; (print "doqueue: " fname)
;;;   (let* ((start-time (current-milliseconds))
;;; 	 (qlen       (queue-length q)))
;;;     (if (> qlen 1)
;;; 	(print "Processing queue of length " qlen))
;;;     (let loop ((count      0)
;;; 	       (responses '()))
;;;       (let ((delta (- (current-milliseconds) start-time)))
;;; 	(if (or (queue-empty? q)
;;; 		(> delta 400)) ;; stop working on this queue after 400ms have passed
;;; 	    (list count delta responses) ;; return count, delta and responses list
;;; 	    (let* ((witem  (queue-remove! q))
;;; 		   (action (witem-action witem))
;;; 		   (rdat   (witem-rdat   witem))
;;; 		   (stmt   (calldat-obj rdat))
;;; 		   (sth    (full-get-sth acfg fname stmt))
;;; 		   (ctype  (calldat-ctype rdat))
;;; 		   (data   (witem-data   witem))
;;; 		   (cookie (witem-cookie witem)))
;;; 	      ;; do the processing and save the result in witem-result
;;; 	      (witem-result-set!
;;; 	       witem
;;; 	       (case ctype ;; action
;;; 		 ((noblockwrite) ;; blind write, no ack of success returned
;;; 		  (apply sqlite3:execute sth data)
;;; 		  (sqlite3:last-insert-rowid dbh))
;;; 		 ((dbwrite)      ;; blocking write   
;;; 		  (apply sqlite3:execute sth data)
;;; 		  #t)
;;; 		 ((dbread) ;; TODO: consider breaking this up and shipping in pieces for large query
;;; 		  (apply sqlite3:map-row (lambda x x) sth data))
;;; 		 ((full-ping)  'full-ping)
;;; 		 (else (print "Not ready for action " action) #f)))
;;; 	      (loop (add1 count)
;;; 		    (if cookie
;;; 			(cons witem responses)
;;; 			responses))))))))
;;; 
;;; ;; do up to 400ms of processing on each queue
;;; ;; - the work-queue-processor will allow the max 1200ms of work to complete but it will flag as overloaded
;;; ;; 
;;; (define (process-db-queries acfg fname)
;;;   (if (hash-table-exists? (area-wqueues acfg) fname)
;;;       (let* ((process-db-queries-start-time (current-milliseconds))
;;; 	     (qdat             (hash-table-ref/default (area-wqueues acfg) fname #f))
;;; 	     (queue-sym->queue (lambda (queue-sym)
;;; 				 (case queue-sym  ;; lookup the queue from qdat given a name (symbol)
;;; 				   ((wqueue)  (qdat-writeq qdat))
;;; 				   ((rqueue)  (qdat-readq  qdat))
;;; 				   ((rwqueue) (qdat-rwq    qdat))
;;; 				   ((misc)    (qdat-misc   qdat))
;;; 				   (else #f))))
;;; 	     (dbdat   (get-dbh acfg fname))
;;; 	     (dbh     (if (dbdat? dbdat)(dbdat-dbh dbdat) #f))
;;; 	     (nowtime (current-seconds)))
;;; 	;; handle the queues that require a transaction
;;; 	;;
;;; 	(map ;; 
;;; 	 (lambda (queue-sym)
;;; 	   ;; (print "processing queue " queue-sym)
;;; 	   (let* ((queue (queue-sym->queue queue-sym)))
;;; 	     (if (not (queue-empty? queue))
;;; 		 (let ((responses
;;; 			(sqlite3:with-transaction ;; todo - catch exceptions...
;;; 			 dbh
;;; 			 (lambda ()
;;; 			   (let* ((res (doqueue acfg queue fname dbdat dbh))) ;; this does the work!
;;; 			     ;; (print "res=" res)
;;; 			     (match res
;;; 			      ((count delta responses)
;;; 			       (update-stats acfg fname queue-sym delta count)
;;; 			       (sdbg> "process-db-queries" "sqlite3-transaction" process-db-queries-start-time #f #f)
;;; 			       responses) ;; return responses
;;; 			      (else
;;; 			       (print "ERROR: bad return data from doqueue " res)))
;;; 			     )))))
;;; 		   ;; having completed the transaction, send the responses.
;;; 		   ;; (print "INFO: sending " (length responses) " responses.")
;;; 		   (let loop ((responses-left responses))
;;; 		     (cond
;;; 		      ((null? responses-left)  #t)
;;; 		      (else
;;; 		       (let* ((witem    (car responses-left))
;;; 			      (response (cdr responses-left)))  
;;; 			 (call-deliver-response acfg (witem-ripaddr witem)(witem-rport witem)
;;; 						(witem-cookie witem)(witem-result witem)))
;;; 		       (loop (cdr responses-left))))))
;;; 		 )))
;;; 	 '(wqueue rwqueue rqueue))
;;; 	
;;; 	;; handle misc queue
;;; 	;;
;;; 	;; (print "processing misc queue")
;;; 	(let ((queue (queue-sym->queue 'misc)))
;;; 	  (doqueue acfg queue fname dbdat dbh))
;;; 	;; ....
;;; 	(save-dbh acfg fname dbdat)
;;; 	#t ;; just to let the tests know we got here
;;; 	)
;;;       #f ;; nothing processed
;;;       ))
;;; 
;;; ;; run all queues in parallel per db but sequentially per queue for that db.
;;; ;;  - process the queues every 500 or so ms
;;; ;;  - allow for long running queries to continue but all other activities for that
;;; ;;    db will be blocked.
;;; ;;
;;; (define (work-queue-processor acfg)
;;;   (let* ((threads (make-hash-table))) ;; fname => thread
;;;     (let loop ((fnames      (hash-table-keys (area-wqueues acfg)))
;;; 	       (target-time (+ (current-milliseconds) 50)))
;;;       ;;(if (not (null? fnames))(print "Processing for these databases: " fnames))
;;;       (for-each
;;;        (lambda (fname)
;;; 	 ;; (print "processing for " fname)
;;; 	 ;;(process-db-queries acfg fname))
;;; 	 (let ((th (hash-table-ref/default threads fname #f)))
;;; 	   (if (and th (not (member (thread-state th) '(dead terminated))))
;;; 	       (begin
;;; 		 (print "WARNING: worker thread for " fname " is taking a long time.")
;;; 		 (print "Thread is in state " (thread-state th)))
;;; 	       (let ((th1 (make-thread (lambda ()
;;; 					 ;; (catch-and-dump
;;; 					 ;;  (lambda ()
;;; 					    ;; (print "Process queries for " fname)
;;; 					    (let ((start-time (current-milliseconds)))
;;; 					      (process-db-queries acfg fname)
;;; 					      ;; (thread-sleep! 0.01) ;; need the thread to take at least some time
;;; 					      (hash-table-delete! threads fname)) ;; no mutexes?
;;; 					    fname)
;;; 					  "th1"))) ;; ))
;;; 		 (hash-table-set! threads fname th1)
;;; 		 (thread-start! th1)))))
;;;        fnames)
;;;       ;; (thread-sleep! 0.1) ;; give the threads some time to process requests
;;;       ;; burn time until 400ms is up
;;;       (let ((now-time (current-milliseconds)))
;;; 	(if (< now-time target-time)
;;; 	    (let ((delta (- target-time now-time)))
;;; 	      (thread-sleep! (/ delta 1000)))))
;;;       (loop (hash-table-keys (area-wqueues acfg))
;;; 	    (+ (current-milliseconds) 50)))))
;;; 
;;; ;;======================================================================
;;; ;; S T A T S   G A T H E R I N G
;;; ;;======================================================================
;;; 
;;; (defstruct stat
;;;   (qcount-avg  0)                  ;; coarse running average
;;;   (qtime-avg   0)                  ;; coarse running average
;;;   (qcount      0)                  ;; total
;;;   (qtime       0)                  ;; total
;;;   (last-qcount 0)                  ;; last 
;;;   (last-qtime  0)                  ;; last
;;;   (dbs        '())                 ;; list of db files handled by this node
;;;   (when        0))                 ;; when the last query happened - seconds
;;; 
;;; 
;;; (define (update-stats acfg fname bucket duration numqueries)
;;;   (let* ((key   fname) ;; for now do not use bucket. Was: (conc fname "-" bucket)) ;; lazy but good enough
;;; 	 (stats (or (hash-table-ref/default (area-stats acfg) key #f)
;;; 		    (let ((newstats (make-stat)))
;;; 		      (hash-table-set! (area-stats acfg) key newstats)
;;; 		      newstats))))
;;;     ;; when the last query happended (used to remove the fname from the active list)
;;;     (stat-when-set! stats (current-seconds))
;;;     ;; last values
;;;     (stat-last-qcount-set! stats numqueries)
;;;     (stat-last-qtime-set!  stats duration)
;;;     ;; total over process lifetime
;;;     (stat-qcount-set! stats (+ (stat-qcount stats) numqueries))
;;;     (stat-qtime-set!  stats (+ (stat-qtime  stats) duration))
;;;     ;; coarse average
;;;     (stat-qcount-avg-set! stats (/ (+ (stat-qcount-avg stats) numqueries) 2))
;;;     (stat-qtime-avg-set!  stats (/ (+ (stat-qtime-avg  stats) duration)   2))
;;; 
;;;     ;; here is where we add the stats for a given dbfile
;;;     (if (not (member fname (stat-dbs stats)))
;;; 	(stat-dbs-set! stats (cons fname (stat-dbs stats))))
;;; 
;;;     ))
;;; 
;;; ;;======================================================================
;;; ;; S E R V E R   S T U F F 
;;; ;;======================================================================
;;; 
;;; ;; this does NOT return!
;;; ;;
;;; (define (find-free-port-and-open acfg)
;;;   (let ((port (or (area-port acfg) 3200)))
;;;     (handle-exceptions
;;; 	exn
;;; 	(begin
;;; 	  (print "INFO: cannot bind to port " (rpc:default-server-port) ", trying next port")
;;; 	  (area-port-set! acfg (+ port 1))
;;; 	  (find-free-port-and-open acfg))
;;;       (rpc:default-server-port port)
;;;       (area-port-set! acfg port)
;;;       (tcp-read-timeout 120000)
;;;       ;; ((rpc:make-server (tcp-listen port)) #t)
;;;       (tcp-listen (rpc:default-server-port)
;;;       ))))
;;; 
;;; ;; register this node by putting a packet into the pkts dir.
;;; ;; look for other servers
;;; ;; contact other servers and compile list of servers
;;; ;; there are two types of server
;;; ;;     main servers - dashboards, runners and dedicated servers - need pkt
;;; ;;     passive servers - test executers, step calls, list-runs - no pkt
;;; ;;
;;; (define (register-node acfg hostip port-num)
;;;   ;;(mutex-lock! (area-mutex acfg))
;;;   (let* ((server-type  (area-server-type acfg)) ;; auto, main, passive (no pkt created)
;;; 	 (best-ip      (or hostip (get-my-best-address)))
;;; 	 (mtdir        (area-dbdir acfg))
;;; 	 (pktdir       (area-pktsdir acfg))) ;; conc mtdir "/.server-pkts")))
;;;     (print "Registering node " best-ip ":" port-num)
;;;     (if (not mtdir) ;; require a home for this node to put or find databases
;;; 	#f
;;; 	(begin
;;; 	  (if  (not (directory? pktdir))(create-directory pktdir))
;;; 	  ;; server is started, now create pkt if needed
;;; 	  (print "Starting server in " server-type " mode with port " port-num)
;;; 	  (if (member server-type '(auto main)) ;; TODO: if auto, count number of servers registers, if > 3 then don't put out a pkt
;;; 	      (begin
;;; 		(area-pktid-set! acfg
;;; 				 (write-alist->pkt
;;; 				  pktdir 
;;; 				  `((hostname . ,(get-host-name))
;;; 				    (ipaddr   . ,best-ip)
;;; 				    (port     . ,port-num)
;;; 				    (pid      . ,(current-process-id)))
;;; 				  pktspec: *pktspec*
;;; 				  ptype:   'server))
;;; 		(area-pktfile-set! acfg (conc pktdir "/" (area-pktid acfg) ".pkt"))))
;;; 	  (area-port-set!    acfg port-num)
;;; 	  #;(mutex-unlock! (area-mutex acfg))))))
;;; 
;;; (define *cookie-seqnum* 0)
;;; (define (make-cookie key)
;;;   (set! *cookie-seqnum* (add1 *cookie-seqnum*))
;;;   ;;(print "MAKE COOKIE CALLED -- on "servkey"-"*cookie-seqnum*)
;;;   (conc key "-" *cookie-seqnum*)
;;;   )
;;; 
;;; ;; dispatch locally if possible
;;; ;;
;;; (define (call-deliver-response acfg ipaddr port cookie data)
;;;   (if (and (equal? (area-myaddr acfg) ipaddr)
;;; 	   (equal? (area-port     acfg) port))
;;;       (deliver-response acfg cookie data)
;;;       ((rpc:procedure 'response ipaddr port) cookie data)))
;;; 
;;; (define (deliver-response acfg cookie data)
;;;   (let ((deliver-response-start (current-milliseconds)))
;;;     (thread-start! (make-thread
;;; 		    (lambda ()
;;; 		      (let loop ((tries-left 5))
;;; 			;;(print "TOP OF DELIVER_RESPONSE LOOP; triesleft="tries-left)
;;; 			;;(pp (hash-table->alist (area-cookie2mbox acfg)))
;;; 			(let* ((mbox (hash-table-ref/default (area-cookie2mbox acfg) cookie #f)))
;;; 			  (cond
;;; 			   ((eq? 0 tries-left)
;;; 			    (print "ulex:deliver-response: I give up. Mailbox never appeared. cookie="cookie)
;;; 			    )
;;; 			   (mbox
;;; 			    ;;(print "got mbox="mbox"  got data="data"  send.")
;;; 			    (mailbox-send! mbox data))
;;; 			   (else
;;; 			    ;;(print "no mbox yet.  look for "cookie)
;;; 			    (thread-sleep! (/ (- 6 tries-left) 10))
;;; 			    (loop (sub1 tries-left))))))
;;; 		      ;; (debug-pp (list (conc "ulex:deliver-response took " (- (current-milliseconds) deliver-response-start) " ms, cookie=" cookie " data=") data))
;;; 		      (sdbg> "deliver-response" "mailbox-send" deliver-response-start #f #f cookie)
;;; 		      )
;;; 		    (conc "deliver-response thread for cookie="cookie))))
;;;   #t)
;;; 
;;; ;; action:
;;; ;;   immediate - quick actions, no need to put in queues
;;; ;;   dbwrite   - put in dbwrite queue
;;; ;;   dbread    - put in dbread queue
;;; ;;   oslong    - os actions, e.g. du, that could take a long time
;;; ;;   osshort   - os actions that should be quick, e.g. df
;;; ;;
;;; (define (request acfg from-ipaddr from-port servkey action cookie fname params) ;; std-peer-handler
;;;   ;; NOTE: Use rpc:current-peer for getting return address
;;;   (let* ((std-peer-handler-start (current-milliseconds))
;;; 	 ;; (raw-data               (alist-ref 'data     dat))
;;; 	 (rdat                   (hash-table-ref/default
;;; 				  (area-rtable acfg) action #f)) ;; this looks up the sql query or other details indexed by the action
;;; 	 (witem                  (make-witem ripaddr: from-ipaddr ;; rhost:   from-host   
;;; 					     rport:   from-port   action:  action
;;; 					     rdat:    rdat        cookie:  cookie
;;; 					     servkey: servkey     data:    params ;; TODO - rename data to params
;;; 					     caller:  (rpc:current-peer))))
;;;     (if (not (equal? servkey (area-pktid acfg)))
;;; 	`(#f . ,(conc "I don't know you servkey=" servkey ", pktid=" (area-pktid acfg))) ;; immediately return this
;;; 	(let* ((ctype (if rdat 
;;; 			  (calldat-ctype rdat) ;; is this necessary? these should be identical
;;; 			  action)))
;;; 	  (sdbg> "std-peer-handler" "immediate" std-peer-handler-start #f #f)
;;; 	  (case ctype
;;; 	    ;; (dbwrite acfg rdat (cons from-ipaddr from-port) data)))
;;; 	    ((full-ping)  `(#t  "ack to full ping"        ,(work-queue-add acfg fname witem) ,cookie))
;;; 	    ((response)   `(#t  "ack from requestor"      ,(deliver-response acfg fname params)))
;;; 	    ((dbwrite)    `(#t  "db write submitted"      ,(work-queue-add acfg fname witem) ,cookie))
;;; 	    ((dbread)     `(#t  "db read submitted"       ,(work-queue-add acfg fname witem) ,cookie  ))
;;; 	    ((dbrw)       `(#t  "db read/write submitted" ,cookie))
;;; 	    ((osshort)    `(#t  "os short submitted"      ,cookie))
;;; 	    ((oslong)     `(#t  "os long submitted"       ,cookie))
;;; 	    (else         `(#f  "unrecognised action"     ,ctype)))))))
;;; 
;;; ;; Call this to start the actual server
;;; ;;
;;; ;; start_server
;;; ;;
;;; ;;   mode: '
;;; ;;   handler: proc which takes pktrecieved as argument
;;; ;;
;;; 
;;; (define (start-server acfg)
;;;   (let* ((conn (find-free-port-and-open acfg))
;;; 	 (port (area-port acfg)))
;;;     (rpc:publish-procedure!
;;;      'delist-db
;;;      (lambda (fname)
;;;        (hash-table-delete! (area-dbs acfg) fname)))
;;;     (rpc:publish-procedure!
;;;      'calling-addr
;;;      (lambda ()
;;;        (rpc:current-peer)))
;;;     (rpc:publish-procedure!
;;;      'ping
;;;      (lambda ()(real-ping acfg)))
;;;     (rpc:publish-procedure!
;;;      'request
;;;      (lambda (from-addr from-port servkey action cookie dbname params)
;;;        (request acfg from-addr from-port servkey action cookie dbname params)))
;;;     (rpc:publish-procedure!
;;;      'response
;;;      (lambda (cookie res-dat)
;;;        (deliver-response acfg cookie res-dat)))
;;;     (area-ready-set! acfg #t)
;;;     (area-conn-set! acfg conn)
;;;     ((rpc:make-server conn) #f)));; ((tcp-listen (rpc:default-server-port)) #t)
;;; 
;;; 
;;; (define (launch acfg) ;;  #!optional (proc std-peer-handler))
;;;   (print "starting launch")
;;;   (update-known-servers acfg) ;; gotta do this on every start (thus why limit number of publicised servers)
;;;   #;(let ((original-handler (current-exception-handler))) ;; is th
;;;     (lambda (exception)
;;;       (server-exit-procedure)
;;;       (original-handler exception)))
;;;   (on-exit (lambda ()
;;; 	     (shutdown acfg))) ;; (finalize-all-db-handles acfg)))
;;;   ;; set up the rpc handler
;;;   (let* ((th1  (make-thread
;;; 		(lambda ()(start-server acfg))
;;; 		"server thread"))
;;; 	 (th2   (make-thread
;;; 		 (lambda ()
;;; 		   (print "th2 starting")
;;; 		   (let loop ()
;;; 		     (work-queue-processor acfg)
;;; 		     (print "work-queue-processor crashed!")
;;; 		     (loop)))
;;; 		 "work queue thread")))
;;;     (thread-start! th1)
;;;     (thread-start! th2)
;;;     (let loop ()
;;;       (thread-sleep! 0.025)
;;;       (if (area-ready acfg)
;;; 	  #t
;;; 	  (loop)))
;;;     ;; attempt to fix my address
;;;     (let* ((all-addr (get-all-ips-sorted)))	     ;; could use (tcp-addresses conn)?
;;;       (let loop ((rem-addrs all-addr))
;;; 	(if (null? rem-addrs)
;;; 	    (begin
;;; 	      (print "ERROR: Failed to figure out the ip address of myself as a server. Giving up.")
;;; 	      (exit 1)) ;; BUG Changeme to raising an exception
;;; 		
;;; 	    (let* ((addr      (car rem-addrs))
;;; 		   (good-addr (handle-exceptions
;;; 				  exn
;;; 				  #f
;;; 				((rpc:procedure 'calling-addr addr (area-port acfg))))))
;;; 	      (if good-addr
;;; 		  (begin
;;; 		    (print "Got good-addr of " good-addr)
;;; 		    (area-myaddr-set! acfg good-addr))
;;; 		  (loop (cdr rem-addrs)))))))
;;;     (register-node acfg (area-myaddr acfg)(area-port acfg))
;;;     (print "INFO: Server started on " (area-myaddr acfg) ":" (area-port acfg))
;;;     ;; (update-known-servers acfg) ;; gotta do this on every start (thus why limit number of publicised servers)
;;;     ))
;;; 
;;; (define (clear-server-pkt acfg)
;;;   (let ((pktf (area-pktfile acfg)))
;;;     (if pktf (delete-file* pktf))))
;;; 
;;; (define (shutdown acfg)
;;;   (let (;;(conn (area-conn    acfg))
;;; 	(pktf (area-pktfile acfg))
;;; 	(port (area-port    acfg)))
;;;     (if pktf (delete-file* pktf))
;;;     (send-all "imshuttingdown")
;;;     ;; (rpc:close-all-connections!) ;; don't know if this is actually needed
;;;     (finalize-all-db-handles acfg)))
;;; 
;;; (define (send-all msg)
;;;   #f)
;;; 
;;; ;; given a area record look up all the packets
;;; ;;
;;; (define (get-all-server-pkts acfg)
;;;   (let ((all-pkt-files (glob (conc (area-pktsdir acfg) "/*.pkt"))))
;;;     (map (lambda (pkt-file)
;;; 	   (read-pkt->alist pkt-file pktspec: *pktspec*))
;;; 	 all-pkt-files)))
;;; 
;;; #;((Z . "9a0212302295a19610d5796fce0370fa130758e9")
;;;   (port . "34827")
;;;   (pid . "28748")
;;;   (hostname . "zeus")
;;;   (T . "server")
;;;   (D . "1549427032.0"))
;;; 
;;; #;(define (get-my-best-address)
;;;   (let ((all-my-addresses (get-all-ips))) ;; (vector->list (hostinfo-addresses (hostname->hostinfo (get-host-name))))))
;;;     (cond
;;;      ((null? all-my-addresses)
;;;       (get-host-name))                                          ;; no interfaces?
;;;      ((eq? (length all-my-addresses) 1)
;;;       (ip->string (car all-my-addresses)))                      ;; only one to choose from, just go with it
;;;      (else 
;;;       (ip->string (car (filter (lambda (x)                      ;; take any but 127.
;;; 				 (not (eq? (u8vector-ref x 0) 127)))
;;; 			       all-my-addresses)))))))
;;; 
;;; ;; whoami? I am my pkt
;;; ;;
;;; (define (whoami? acfg)
;;;   (hash-table-ref/default (area-hosts acfg)(area-pktid acfg) #f))
;;; 
;;; ;;======================================================================
;;; ;; "Client side" operations
;;; ;;======================================================================
;;; 
;;; (define (safe-call call-key host port . params)
;;;   (handle-exceptions
;;;    exn
;;;    (begin
;;;      (print "Call " call-key " to " host ":" port " failed")
;;;      #f)
;;;    (apply (rpc:procedure call-key host port) params)))
;;; 
;;; ;; ;; convert to/from string / sexpr
;;; ;; 
;;; ;; (define (string->sexpr str)
;;; ;;   (if (string? str)
;;; ;;       (with-input-from-string str read)
;;; ;;       str))
;;; ;; 
;;; ;; (define (sexpr->string s)
;;; ;;   (with-output-to-string (lambda ()(write s))))
;;; 
;;; ;; is the server alive?
;;; ;;
;;; (define (ping acfg host port)
;;;   (let* ((myaddr     (area-myaddr acfg))
;;; 	 (myport     (area-port   acfg))
;;; 	 (start-time (current-milliseconds))
;;; 	 (res        (if (and (equal? myaddr host)
;;; 			      (equal? myport port))
;;; 			 (real-ping acfg)
;;; 			 ((rpc:procedure 'ping host port)))))
;;;     (cons (- (current-milliseconds) start-time)
;;; 	  res)))
;;; 
;;; ;; returns ( ipaddr port alist-fname=>randnum )
;;; (define (real-ping acfg)
;;;   `(,(area-myaddr acfg) ,(area-port acfg) ,(get-host-stats acfg)))
;;; 
;;; ;; is the server alive AND the queues processing?
;;; ;;
;;; #;(define (full-ping acfg servpkt)
;;;   (let* ((start-time (current-milliseconds))
;;; 	 (res        (send-message acfg servpkt '(full-ping) 'full-ping)))
;;;     (cons (- (current-milliseconds) start-time)
;;; 	  res))) ;; (equal? res "got ping"))))
;;; 
;;; 
;;; ;; look up all pkts and get the server id (the hash), port, host/ip
;;; ;; store this info in acfg
;;; ;; return the number of responsive servers found
;;; ;;
;;; ;; DO NOT VERIFY THAT THE SERVER IS ALIVE HERE. This is called at times where the current server is not yet alive and cannot ping itself
;;; ;;
;;; (define (update-known-servers acfg)
;;;   ;; readll all pkts
;;;   ;; foreach pkt; if it isn't me ping the server; if alive, add to hosts hash, else rm the pkt
;;;   (let* ((start-time (current-milliseconds))
;;; 	 (all-pkts  (delete-duplicates
;;; 		     (append (get-all-server-pkts acfg)
;;; 			     (hash-table-values (area-hosts acfg)))))
;;; 	 (hostshash (area-hosts acfg))
;;; 	 (my-id     (area-pktid acfg))
;;; 	 (pktsdir   (area-pktsdir acfg)) ;; needed to remove pkts from non-responsive servers
;;; 	 (numsrvs   0)
;;; 	 (delpkt    (lambda (pktsdir sid)
;;; 		      (print "clearing out server " sid)
;;; 		      (delete-file* (conc pktsdir "/" sid ".pkt"))
;;; 		      (hash-table-delete! hostshash sid))))
;;;     (area-last-srvup-set! acfg (current-seconds))
;;;     (for-each
;;;      (lambda (servpkt)
;;;        (if (list? servpkt)
;;; 	   ;; (pp servpkt)
;;; 	   (let* ((shost (alist-ref 'ipaddr servpkt))
;;; 		  (sport (any->number (alist-ref 'port servpkt)))
;;; 		  (res   (handle-exceptions
;;; 			  exn
;;; 			  (begin
;;; 			    ;; (print "INFO: bad server on " shost ":" sport)
;;; 			    #f)
;;; 			  (ping acfg shost sport)))
;;; 		  (sid   (alist-ref 'Z servpkt)) ;; Z code is our name for the server
;;; 		  (url   (conc shost ":" sport))
;;; 		  )
;;; 	     #;(if (or (not res)
;;; 		     (null? res))
;;; 		 (begin
;;; 		   (print "STRANGE: ping of " url " gave " res)))
;;; 	     
;;; 	     ;; (print "Got " res " from " shost ":" sport)
;;; 	     (match res
;;; 		    ((qduration . payload)
;;; 		     ;; (print "Server pkt:" (alist-ref 'ipaddr servpkt) ":" (alist-ref 'port servpkt)
;;; 		     ;;        (if payload
;;; 		     ;;            "Success" "Fail"))
;;; 		     (match payload
;;; 			    ((host port stats)
;;; 			     ;; (print "From " host ":" port " got stats: " stats)
;;; 			     (if (and host port stats)
;;; 				 (let ((url (conc host ":" port)))
;;; 				   (hash-table-set! hostshash sid servpkt)
;;; 				   ;; store based on host:port
;;; 				   (hash-table-set! (area-hoststats acfg) sid stats))
;;; 				 (print "missing data from the server, not sure what that means!"))
;;; 			     (set! numsrvs (+ numsrvs 1)))
;;; 			    (#f
;;; 			     (print "Removing pkt " sid " due to #f from server or failed ping")
;;; 			     (delpkt pktsdir sid))
;;; 			    (else
;;; 			     (print "Got ")(pp res)(print " from server ")(pp servpkt) " but response did not match (#f/#t . msg)")))
;;; 		    (else
;;; 		     ;; here we delete the pkt - can't reach the server, remove it
;;; 		     ;; however this logic is inadequate. we should mark the server as checked
;;; 		     ;; and not good, if it happens a second time - then remove the pkt
;;; 		     ;; or something similar. I.e. don't be too quick to assume the server is wedged or dead
;;; 		     ;; could be it is simply too busy to reply
;;; 		     (let ((bad-pings (hash-table-ref/default (area-health acfg) url 0)))
;;; 		       (if (> bad-pings 1) ;; two bad pings - remove pkt
;;; 			   (begin
;;; 			     (print "INFO: " bad-pings " bad responses from " url ", deleting pkt " sid)
;;; 			     (delpkt pktsdir sid))
;;; 			   (begin
;;; 			     (print "INFO: " bad-pings " bad responses from " shost ":" sport " not deleting pkt yet")
;;; 			     (hash-table-set! (area-health acfg)
;;; 					      url
;;; 					      (+ (hash-table-ref/default (area-health acfg) url 0) 1))
;;; 			     ))
;;; 		       ))))
;;; 	   ;; servpkt is not actually a pkt?
;;; 	   (begin
;;; 	     (print "Bad pkt " servpkt))))
;;;      all-pkts)
;;;     (sdbg> "update-known-servers" "end" start-time #f #f " found " numsrvs
;;; 	   " servers, pkts: " (map (lambda (p)
;;; 				     (alist-ref 'Z p))
;;; 				   all-pkts))
;;;     numsrvs))
;;; 
;;; (defstruct srvstat
;;;   (numfiles 0)   ;; number of db files handled by this server - subtract 1 for the db being currently looked at
;;;   (randnum  #f)  ;; tie breaker number assigned to by the server itself - applies only to the db under consideration
;;;   (pkt      #f)) ;; the server pkt
;;; 
;;; ;;(define (srv->srvstat srvpkt)
;;;   
;;; ;; Get the server best for given dbname and key
;;; ;;
;;; ;;   NOTE: key is not currently used. The key points to the kind of query, this may be useful for directing read-only queries.
;;; ;;
;;; (define (get-best-server acfg dbname key)
;;;   (let* (;; (servers (hash-table-values (area-hosts acfg)))
;;; 	 (servers     (area-hosts acfg))
;;; 	 (skeys       (sort (hash-table-keys servers) string>=?)) ;; a stable listing
;;; 	 (start-time  (current-milliseconds))
;;; 	 (srvstats    (make-hash-table))  ;; srvid => srvstat
;;; 	 (url         (conc (area-myaddr acfg) ":" (area-port acfg))))
;;;     ;; (print "scores for " dbname ": " (map (lambda (k)(cons k (calc-server-score acfg dbname k))) skeys))
;;;     (if (null? skeys)
;;; 	(if (> (update-known-servers acfg) 0)
;;; 	    (get-best-server acfg dbname key) ;; some risk of infinite loop here, TODO add try counter
;;; 	    (begin
;;; 	      (print "ERROR: no server found!") ;; since this process is also a server this should never happen
;;; 	      #f))
;;; 	(begin
;;; 	  ;; (print "in get-best-server with skeys=" skeys)
;;; 	  (if (> (- (current-seconds) (area-last-srvup acfg)) 10)
;;; 	      (begin
;;; 		(update-known-servers acfg)
;;; 		(sdbg> "get-best-server" "update-known-servers" start-time #f #f)))
;;; 
;;; 	  ;; for each server look at the list of dbfiles, total number of dbs being handled
;;; 	  ;; and the rand number, save the best host
;;; 	  ;; also do a delist-db for each server dbfile not used
;;; 	  (let* ((best-server       #f)
;;; 		 (servers-to-delist (make-hash-table)))
;;; 	    (for-each
;;; 	     (lambda (srvid)
;;; 	       (let* ((server    (hash-table-ref/default servers srvid #f))
;;; 		      (stats     (hash-table-ref/default (area-hoststats acfg) srvid '(()))))
;;; 		 ;; (print "stats: " stats)
;;;  		 (if server
;;; 		     (let* ((dbweights (car stats))
;;; 			    (srvload   (length (filter (lambda (x)(not (equal? dbname (car x)))) dbweights)))
;;; 			    (dbrec     (alist-ref dbname dbweights equal?))  ;; get the pair with fname . randscore
;;; 			    (randnum   (if dbrec
;;; 					   dbrec ;; (cdr dbrec)
;;; 					   0)))
;;; 		       (hash-table-set! srvstats srvid (make-srvstat numfiles: srvload randnum: randnum pkt: server))))))
;;; 	     skeys)
;;; 	    
;;; 	    (let* ((sorted    (sort (hash-table-values srvstats) 
;;; 				    (lambda (a b)
;;; 				      (let ((numfiles-a (srvstat-numfiles a))
;;; 					    (numfiles-b (srvstat-numfiles b))
;;; 					    (randnum-a  (srvstat-randnum a))
;;; 					    (randnum-b  (srvstat-randnum b)))
;;; 					(if (< numfiles-a numfiles-b) ;; Note, I don't think adding an offset works here. Goal was only move file handling to a different server if it has 2 less
;;; 					    #t
;;; 					    (if (and (equal? numfiles-a numfiles-b)
;;; 						     (< randnum-a randnum-b))
;;; 						#t
;;; 						#f))))))
;;; 		   (best      (if (null? sorted)
;;; 				  (begin
;;; 				    (print "ERROR: should never be null due to self as server.")
;;; 				    #f)
;;; 				  (srvstat-pkt (car sorted)))))
;;; 	      #;(print "SERVER(" url "): " dbname ": " (map (lambda (srv)
;;; 							    (let ((p (srvstat-pkt srv)))
;;; 							      (conc (alist-ref 'ipaddr p) ":" (alist-ref 'port p)
;;; 								    "(" (srvstat-numfiles srv)","(srvstat-randnum srv)")")))
;;; 							    sorted))
;;; 	      best))))))
;;;     
;;;     ;; send out an "I'm about to exit notice to all known servers"
;;;     ;;
;;; (define (death-imminent acfg)
;;;   '())
;;; 
;;; ;;======================================================================
;;; ;; U L E X  -  T H E   I N T E R E S T I N G   S T U F F ! !
;;; ;;======================================================================
;;; 
;;; ;; register a handler
;;; ;;   NOTES:
;;; ;;     dbinitsql   is reserved for a list of sql statements for initializing the db
;;; ;;     dbinitfn    is reserved for a db init function, if exists called after dbinitsql
;;; ;;     
;;; (define (register acfg key obj #!optional (ctype 'dbwrite))
;;;   (let ((ht (area-rtable acfg)))
;;;     (if (hash-table-exists? ht key)
;;; 	(print "WARNING: redefinition of entry " key))
;;;     (hash-table-set! ht key (make-calldat obj: obj ctype: ctype))))
;;; 
;;; ;; usage: register-batch acfg '((key1 . sql1) (key2 . sql2) ... )
;;; ;; NB// obj is often an sql query
;;; ;;
;;; (define (register-batch acfg ctype data)
;;;   (let ((ht (area-rtable acfg)))
;;;     (map (lambda (dat)
;;; 	   (hash-table-set! ht (car dat)(make-calldat obj: (cdr dat) ctype: ctype)))
;;; 	 data)))
;;; 
;;; (define (initialize-area-calls-from-specfile area specfile)
;;;   (let* ((callspec (with-input-from-file specfile read )))
;;;     (for-each (lambda (group)
;;;                 (register-batch
;;;                  area
;;;                  (car group)
;;;                  (cdr group)))
;;;               callspec)))
;;; 
;;; ;; get-rentry
;;; ;;
;;; (define (get-rentry acfg key)
;;;   (hash-table-ref/default (area-rtable acfg) key #f))
;;; 
;;; (define (get-rsql acfg key)
;;;   (let ((cdat (get-rentry acfg key)))
;;;     (if cdat
;;; 	(calldat-obj cdat)
;;; 	#f)))
;;; 
;;; 
;;; 
;;; ;; blocking call:
;;; ;;    client                         server
;;; ;;    ------                         ------
;;; ;;    call()
;;; ;;    send-message()
;;; ;;    nmsg-send()
;;; ;;                                   nmsg-receive()
;;; ;;                                   nmsg-respond(ack,cookie)
;;; ;;    ack, cookie
;;; ;;    mbox-thread-wait(cookie)
;;; ;;                                   nmsg-send(client,cookie,result)
;;; ;;        nmsg-respond(ack)
;;; ;;        return result
;;; ;;
;;; ;; reserved action:
;;; ;;    'immediate
;;; ;;    'dbinitsql
;;; ;;
;;; (define (call acfg dbname action params #!optional (count 0))
;;;   (let* ((call-start-time     (current-milliseconds))
;;; 	 (srv                 (get-best-server acfg dbname action))
;;; 	 (post-get-start-time (current-milliseconds))
;;; 	 (rdat                (hash-table-ref/default (area-rtable acfg) action #f))
;;; 	 (myid                (trim-pktid (area-pktid acfg)))
;;; 	 (srvid               (trim-pktid (alist-ref 'Z srv)))
;;; 	 (cookie              (make-cookie myid)))
;;;     (sdbg> "call" "get-best-server" call-start-time #f call-start-time " from: " myid " to server: " srvid " for " dbname " action: " action " params: " params " rdat: " rdat)
;;;     (print "INFO: call to " (alist-ref 'ipaddr srv) ":" (alist-ref 'port srv) " from " (area-myaddr acfg) ":" (area-port acfg) " for " dbname)
;;;     (if (and srv rdat) ;; need both to dispatch a request
;;; 	(let* ((ripaddr  (alist-ref 'ipaddr srv))
;;; 	       (rsrvid   (alist-ref 'Z srv))
;;; 	       (rport    (any->number (alist-ref 'port   srv)))
;;; 	       (res-full (if (and (equal? ripaddr (area-myaddr acfg))
;;; 				  (equal? rport   (area-port acfg)))
;;; 			     (request acfg ripaddr rport (area-pktid acfg) action cookie dbname params)
;;; 			     (safe-call 'request ripaddr rport
;;; 					(area-myaddr acfg)
;;; 					(area-port   acfg)
;;; 					#;(area-pktid acfg)
;;; 					rsrvid
;;; 					action cookie dbname params))))
;;; 	  ;; (print "res-full: " res-full)
;;; 	  (match res-full
;;; 	    ((response-ok response-msg rem ...)
;;; 	     (let* ((send-message-time (current-milliseconds))
;;; 		    ;; (match res-full
;;; 		    ;;  ((response-ok response-msg)
;;; 		    ;; (response-ok  (car res-full))
;;; 		    ;; (response-msg (cadr res-full)
;;; 		    )
;;; 	       ;; (res (take res-full 3))) ;; ctype == action, TODO: converge on one term <<=== what was this? BUG 
;;; 	       ;; (print "ulex:call: send-message took " (- send-message-time post-get-start-time) " ms params=" params)
;;; 	       (sdbg> "call" "send-message" post-get-start-time #f call-start-time)
;;; 	       (cond
;;; 		((not response-ok) #f)
;;; 		((member response-msg '("db read submitted" "db write submitted"))
;;; 		 (let* ((cookie-id   (cadddr res-full))
;;; 			(mbox        (make-mailbox))
;;; 			(mbox-time   (current-milliseconds)))
;;; 		   (hash-table-set! (area-cookie2mbox acfg) cookie-id mbox)
;;; 		   (let* ((mbox-timeout-secs    20)
;;; 			  (mbox-timeout-result 'MBOX_TIMEOUT)
;;; 			  (res                  (mailbox-receive! mbox mbox-timeout-secs mbox-timeout-result))
;;; 			  (mbox-receive-time    (current-milliseconds)))
;;; 		     (hash-table-delete! (area-cookie2mbox acfg) cookie-id)
;;; 		     (sdbg> "call" "mailbox-receive" mbox-time #f call-start-time " from: " myid " to server: " srvid " for " dbname)
;;; 		     ;; (print "ulex:call mailbox-receive took " (- mbox-receive-time mbox-time) "ms params=" params)
;;; 		     res)))
;;; 		(else
;;; 		 (print "Unhandled response \""response-msg"\"")
;;; 		 #f))
;;; 	       ;; depending on what action (i.e. ctype) is we will block here waiting for
;;; 	       ;; all the data (mechanism to be determined)
;;; 	       ;;
;;; 	       ;; if res is a "working on it" then wait
;;; 	       ;;    wait for result
;;; 	       ;; mailbox thread wait on 
;;; 	       
;;; 	       ;; if res is a "can't help you" then try a different server
;;; 	       ;; if res is a "ack" (e.g. for one-shot requests) then return res
;;; 	       ))
;;; 	    (else
;;; 	     (if (< count 10)
;;; 		 (let* ((url (conc (alist-ref 'ipaddr srv) ":" (alist-ref 'port srv))))
;;; 		   (thread-sleep! 1)
;;; 		   (print "ERROR: Bad result from " url ", dbname: " dbname ", action: " action ", params: " params ". Trying again in 1 second.")
;;; 		   (call acfg dbname action params (+ count 1)))
;;; 		 (begin
;;; 		   (error (conc "ERROR: " count " tries, still have improper response res-full=" res-full)))))))
;;; 	(begin
;;; 	  (if (not rdat)
;;; 	      (print "ERROR: action " action " not registered.")
;;; 	      (if (< count 10)
;;; 		 (begin
;;; 		   (thread-sleep! 1)
;;; 		   (area-hosts-set! acfg (make-hash-table)) ;; clear out all known hosts
;;; 		   (print "ERROR: no server found, srv=" srv ", trying again in 1 seconds")
;;; 		   (call acfg dbname action params (+ count 1)))
;;; 		 (begin
;;; 		   (error (conc "ERROR: no server found after 10 tries, srv=" srv ", giving up."))
;;; 		   #;(error "No server available"))))))))
;;; 
;;; 
;;; ;;======================================================================
;;; ;; U T I L I T I E S 
;;; ;;======================================================================
;;; 
;;; ;; get a signature for identifing this process
;;; ;;
;;; (define (get-process-signature)
;;;   (cons (get-host-name)(current-process-id)))
;;; 
;;; ;;======================================================================
;;; ;; S Y S T E M   S T U F F
;;; ;;======================================================================
;;; 
;;; ;; get normalized cpu load by reading from /proc/loadavg and
;;; ;; /proc/cpuinfo return all three values and the number of real cpus
;;; ;; and the number of threads returns alist '((adj-cpu-load
;;; ;; . normalized-proc-load) ... etc.  keys: adj-proc-load,
;;; ;; adj-core-load, 1m-load, 5m-load, 15m-load
;;; ;;
;;; (define (get-normalized-cpu-load)
;;;   (let ((res (get-normalized-cpu-load-raw))
;;; 	(default `((adj-proc-load . 2) ;; there is no right answer
;;; 		   (adj-core-load . 2)
;;; 		   (1m-load       . 2)
;;; 		   (5m-load       . 0) ;; causes a large delta - thus causing default of throttling if stuff goes wrong
;;; 		   (15m-load      . 0)
;;; 		   (proc          . 1)
;;; 		   (core          . 1)
;;; 		   (phys          . 1)
;;; 		   (error         . #t))))
;;;     (cond
;;;      ((and (list? res)
;;; 	   (> (length res) 2))
;;;       res)
;;;      ((eq? res #f)   default) ;; add messages?
;;;      ((eq? res #f) default)   ;; this would be the #eof
;;;      (else default))))
;;; 
;;; (define (get-normalized-cpu-load-raw)
;;;   (let* ((actual-host           (get-host-name))) ;; #f is localhost
;;;     (let ((data  (append 
;;; 		  (with-input-from-file "/proc/loadavg" read-lines)
;;; 		  (with-input-from-file "/proc/cpuinfo" read-lines)
;;; 		  (list "end")))
;;; 	  (load-rx  (regexp "^([\\d\\.]+)\\s+([\\d\\.]+)\\s+([\\d\\.]+)\\s+.*$"))
;;; 	  (proc-rx  (regexp "^processor\\s+:\\s+(\\d+)\\s*$"))
;;; 	  (core-rx  (regexp "^core id\\s+:\\s+(\\d+)\\s*$"))
;;; 	  (phys-rx  (regexp "^physical id\\s+:\\s+(\\d+)\\s*$"))
;;; 	  (max-num  (lambda (p n)(max (string->number p) n))))
;;;       ;; (print "data=" data)
;;;       (if (null? data) ;; something went wrong
;;; 	  #f
;;; 	  (let loop ((hed      (car data))
;;; 		     (tal      (cdr data))
;;; 		     (loads    #f)
;;; 		     (proc-num 0)  ;; processor includes threads
;;; 		     (phys-num 0)  ;; physical chip on motherboard
;;; 		     (core-num 0)) ;; core
;;; 	    ;; (print hed ", " loads ", " proc-num ", " phys-num ", " core-num)
;;; 	    (if (null? tal) ;; have all our data, calculate normalized load and return result
;;; 		(let* ((act-proc (+ proc-num 1))
;;; 		       (act-phys (+ phys-num 1))
;;; 		       (act-core (+ core-num 1))
;;; 		       (adj-proc-load (/ (car loads) act-proc))
;;; 		       (adj-core-load (/ (car loads) act-core))
;;; 		       (result
;;; 			(append (list (cons 'adj-proc-load adj-proc-load)
;;; 				      (cons 'adj-core-load adj-core-load))
;;; 				(list (cons '1m-load (car loads))
;;; 				      (cons '5m-load (cadr loads))
;;; 				      (cons '15m-load (caddr loads)))
;;; 				(list (cons 'proc act-proc)
;;; 				      (cons 'core act-core)
;;; 				      (cons 'phys act-phys)))))
;;; 		  result)
;;; 		(regex-case
;;; 		    hed
;;; 		  (load-rx  ( x l1 l5 l15 ) (loop (car tal)(cdr tal)(map string->number (list l1 l5 l15)) proc-num phys-num core-num))
;;; 		  (proc-rx  ( x p         ) (loop (car tal)(cdr tal) loads           (max-num p proc-num) phys-num core-num))
;;; 		  (phys-rx  ( x p         ) (loop (car tal)(cdr tal) loads           proc-num (max-num p phys-num) core-num))
;;; 		  (core-rx  ( x c         ) (loop (car tal)(cdr tal) loads           proc-num phys-num (max-num c core-num)))
;;; 		  (else 
;;; 		   (begin
;;; 		     ;; (print "NO MATCH: " hed)
;;; 		     (loop (car tal)(cdr tal) loads proc-num phys-num core-num))))))))))
;;; 
;;; (define (get-host-stats acfg)
;;;   (let ((stats-hash (area-stats acfg)))
;;;     ;; use this opportunity to remove references to dbfiles which have not been accessed in a while
;;;     (for-each
;;;      (lambda (dbname)
;;;        (let* ((stats       (hash-table-ref stats-hash dbname))
;;; 	      (last-access (stat-when stats)))
;;; 	 (if (and (> last-access 0)                             ;; if zero then there has been no access
;;; 		  (> (- (current-seconds) last-access) 10))     ;; not used in ten seconds
;;; 	     (begin
;;; 	       (print "Removing " dbname " from stats list")
;;; 	       (hash-table-delete! stats-hash dbname) ;; remove from stats hash
;;; 	       (stat-dbs-set! stats (hash-table-keys stats))))))
;;;      (hash-table-keys stats-hash))
;;;     
;;;     `(,(hash-table->alist (area-dbs acfg)) ;; dbname => randnum
;;;       ,(map (lambda (dbname)  ;; dbname is the db name
;;; 	      (cons dbname (stat-when (hash-table-ref stats-hash dbname))))
;;; 	    (hash-table-keys stats-hash))
;;;       (cpuload . ,(get-normalized-cpu-load)))))
;;;     #;(stats   . ,(map (lambda (k) ;; create an alist from the stats data
;;; 		       (cons k (stat->alist (hash-table-ref (area-stats acfg) k))))
;;; 		     (hash-table-keys (area-stats acfg))))
;;; 
;;; #;(trace
;;;  ;; assv
;;;  ;; cdr
;;;  ;; caar
;;;  ;; ;; cdr
;;;  ;; call
;;;  ;; finalize-all-db-handles
;;;  ;; get-all-server-pkts
;;;  ;; get-normalized-cpu-load
;;;  ;; get-normalized-cpu-load-raw
;;;  ;; launch
;;;  ;; nmsg-send
;;;  ;; process-db-queries
;;;  ;; receive-message
;;;  ;; std-peer-handler
;;;  ;; update-known-servers
;;;  ;; work-queue-processor
;;;  )
;;; 
;;; ;;======================================================================
;;; ;; netutil
;;; ;;   move this back to ulex-netutil.scm someday?
;;; ;;======================================================================
;;; 
;;; ;; #include <stdio.h>
;;; ;; #include <netinet/in.h>
;;; ;; #include <string.h>
;;; ;; #include <arpa/inet.h>
;;; 
;;; (foreign-declare "#include \"sys/types.h\"")
;;; (foreign-declare "#include \"sys/socket.h\"")
;;; (foreign-declare "#include \"ifaddrs.h\"")
;;; (foreign-declare "#include \"arpa/inet.h\"")
;;; 
;;; ;; get IP addresses from ALL interfaces
;;; (define get-all-ips
;;;   (foreign-safe-lambda* scheme-object ()
;;;     "
;;; 
;;; // from https://stackoverflow.com/questions/17909401/linux-c-get-default-interfaces-ip-address :
;;; 
;;; 
;;;     C_word lst = C_SCHEME_END_OF_LIST, len, str, *a;
;;; //    struct ifaddrs *ifa, *i;
;;; //    struct sockaddr *sa;
;;; 
;;;     struct ifaddrs * ifAddrStruct = NULL;
;;;     struct ifaddrs * ifa = NULL;
;;;     void * tmpAddrPtr = NULL;
;;; 
;;;     if ( getifaddrs(&ifAddrStruct) != 0)
;;;       C_return(C_SCHEME_FALSE);
;;; 
;;; //    for (i = ifa; i != NULL; i = i->ifa_next) {
;;;     for (ifa = ifAddrStruct; ifa != NULL; ifa = ifa->ifa_next) {
;;;         if (ifa->ifa_addr->sa_family==AF_INET) { // Check it is
;;;             // a valid IPv4 address
;;;             tmpAddrPtr = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
;;;             char addressBuffer[INET_ADDRSTRLEN];
;;;             inet_ntop(AF_INET, tmpAddrPtr, addressBuffer, INET_ADDRSTRLEN);
;;; //            printf(\"%s IP Address %s\\n\", ifa->ifa_name, addressBuffer);
;;;             len = strlen(addressBuffer);
;;;             a = C_alloc(C_SIZEOF_PAIR + C_SIZEOF_STRING(len));
;;;             str = C_string(&a, len, addressBuffer);
;;;             lst = C_a_pair(&a, str, lst);
;;;         } 
;;; 
;;; //        else if (ifa->ifa_addr->sa_family==AF_INET6) { // Check it is
;;; //            // a valid IPv6 address
;;; //            tmpAddrPtr = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
;;; //            char addressBuffer[INET6_ADDRSTRLEN];
;;; //            inet_ntop(AF_INET6, tmpAddrPtr, addressBuffer, INET6_ADDRSTRLEN);
;;; ////            printf(\"%s IP Address %s\\n\", ifa->ifa_name, addressBuffer);
;;; //            len = strlen(addressBuffer);
;;; //            a = C_alloc(C_SIZEOF_PAIR + C_SIZEOF_STRING(len));
;;; //            str = C_string(&a, len, addressBuffer);
;;; //            lst = C_a_pair(&a, str, lst);
;;; //       }
;;; 
;;; //       else {
;;; //         printf(\" not an IPv4 address\\n\");
;;; //       }
;;; 
;;;     }
;;; 
;;;     freeifaddrs(ifa);
;;;     C_return(lst);
;;; 
;;; "))
;;; 
;;; ;; Change this to bias for addresses with a reasonable broadcast value?
;;; ;;
;;; (define (ip-pref-less? a b)
;;;   (let* ((rate (lambda (ipstr)
;;;                  (regex-case ipstr
;;;                              ( "^127\\." _ 0 )
;;;                              ( "^(10\\.0|192\\.168\\.)\\..*" _ 1 )
;;;                              ( else 2 ) ))))
;;;     (< (rate a) (rate b))))
;;;   
;;; 
;;; (define (get-my-best-address)
;;;   (let ((all-my-addresses (get-all-ips))
;;;         ;;(all-my-addresses-old (vector->list (hostinfo-addresses (hostname->hostinfo (get-host-name)))))
;;;         )
;;;     (cond
;;;      ((null? all-my-addresses)
;;;       (get-host-name))                                          ;; no interfaces?
;;;      ((eq? (length all-my-addresses) 1)
;;;       (car all-my-addresses))                      ;; only one to choose from, just go with it
;;;      
;;;      (else
;;;       (car (sort all-my-addresses ip-pref-less?)))
;;;      ;; (else 
;;;      ;;  (ip->string (car (filter (lambda (x)                      ;; take any but 127.
;;;      ;;    			 (not (eq? (u8vector-ref x 0) 127)))
;;;      ;;    		       all-my-addresses))))
;;; 
;;;      )))
;;; 
;;; (define (get-all-ips-sorted)
;;;   (sort (get-all-ips) ip-pref-less?))
;;; 
;;; 
)