Megatest

			   pid: pid)))
	       (hash-table-set! (tt-conns ttdat) dbfname conn)
	       ;; verify we can talk to this server
	       (if (tt:ping host port server-id)
		   conn
		   (let* ((curr-secs (current-seconds)))
		     ;; rm the (last server) would go here
		     (if (> (- curr-secs (tt-last-serv-start ttdat)) 10)
			 (begin
			   (tt-last-serv-start-set! ttdat curr-secs)
			   (server-start-proc))) ;; don't try and start server unless 30 sec has gone by since last attempt
		     (thread-sleep! 1)
		     (tt:client-connect-to-server ttdat dbfname run-id testsuite)))))
	    (else
	     (if (> (- (current-seconds) (tt-last-serv-start ttdat)) 5) ;; really do not want to swamp the machine with servers
		 (begin
		   (debug:print-info 0 *default-log-port* "No server found. Starting one for run-id "run-id" in dbfile "dbfname)

		   (server-start-proc)
		   (tt-last-serv-start-set! ttdat (current-seconds))))
	     (thread-sleep! 1)
	     (tt:client-connect-to-server ttdat dbfname run-id testsuite)))))))
    
(define (tt:ping host port server-id)
  (let*  ((res (tt:send-receive-direct host port `(ping #f #f #f)))) ;; please send me your server-id
    ;;
    ;; need two threads, one a 5 second timer

	     #f)))
      (else
       ;; (debug:print 0 *default-log-port* "res not in form (status errmsg result meta), got: "res)
       #f))))

;; client side handler
;;
;;(tt:handler #<tt> get-keys #f () 2 #f "/home/matt/data/megatest/ext-tests" #f "main.db" "ext-tests" "/home/matt/data/megatest/bin/.22.04/../megatest")
;;
(define (tt:handler ttdat cmd run-id params attemptnum area-dat areapath readonly-mode dbfname testsuite mtexe)
  ;; NOTE: areapath is passed in and in tt struct. We'll use passed in value for now.
  (let* ((conn (tt:client-connect-to-server ttdat dbfname run-id testsuite))) ;; (hash-table-ref/default (tt-conns ttdat) dbfname #f)))
    (if conn
	;; have connection, call the server
	(let* ((res (tt:send-receive ttdat conn cmd run-id params)))
	  ;; res is (status errmsg result meta)
	  (match res
	    ((status errmsg result meta)
	     (if (list? meta)
		 (let* ((delay-wait (alist-ref 'delay-wait meta)))
		   (if (and (number? delay-wait)
			    (> delay-wait 0))
		       (begin
			 (debug:print 0 *default-log-port* "Server is loaded, delaying "delay-wait" seconds")
			 (thread-sleep! delay-wait)))))
	     (case status
	       ((busy) ;; result will be how long the server wants you to delay
		(debug:print 0 *default-log-port* "WARNING: server is overloaded, will try again in "result" seconds.")
		(thread-sleep! (if (number? result) result 2))
		(tt:handler  ttdat cmd run-id params (+ attemptnum 1) area-dat areapath readonly-mode dbfname testsuite mtexe))
	       ((loaded)
		(debug:print 0 *default-log-port* "WARNING: server is loaded, will try again in a 1/4 second.")
		(thread-sleep! 0.25)
		(tt:handler  ttdat cmd run-id params (+ attemptnum 1) area-dat areapath readonly-mode dbfname testsuite mtexe))
	       (else
		result)))
	    (else
	     (if (not res)
		 (let* ((host    (tt-conn-host conn))
			(port    (tt-conn-port conn))
			;; (dbfname (tt-conn-port conn)) ;; 192.168.0.127:4242-726924:4.db
			(pid     (tt-conn-pid  conn))
			(servinf (conc areapath"/.servinfo/"host":"port"-"pid":"dbfname)))
		   (hash-table-set! (tt-conns ttdat) dbfname #f)
		   (if (file-exists? servinf)
		       (begin
			 (debug:print 0 *default-log-port* "INFO: connection to server "host":"port" broken for "dbfname", attempting to remove servinfo file.")
			 (delete-file* servinf))
		       (debug:print 0 *default-log-port* "INFO: connection to server "host":"port" broken for "dbfname", but do not see servinf file "servinf))
		   (tt:handler ttdat cmd run-id params (+ attemptnum 1) area-dat areapath readonly-mode dbfname testsuite mtexe))
		 (assert #f "FATAL: tt:handler received bad data "res)))))
	(begin
	  (thread-sleep! 1) ;; give it a rest and try again
	  (tt:handler ttdat cmd run-id params attemptnum area-dat areapath readonly-mode dbfname testsuite mtexe)))))

	;; no conn yet, find and or start and find a server
;; 	(let* ((server (tt:find-server ttdat dbfname)))

;;
(define (tt:start-server areapath run-id dbfname handler keys)
  (assert areapath "FATAL: areapath not provided for tt:start-server")
  ;; is there already a server for this dbfile? Then exit.
  (let* ((ttdat   (make-tt areapath: areapath)))
    ;; (servers (tt:find-server areapath dbfname))) ;; should use tt:get-current-server-info instead
    ;; (if (null? servers)
    (let* ((dbstruct   (dbmod:open-dbmoddb areapath run-id dbfname (dbfile:db-init-proc) keys)))
      (tt-handler-set! ttdat (handler dbstruct))
      (let* ((tcp-thread (make-thread
			  (lambda ()
			    (tt:start-tcp-server ttdat)) ;; start the tcp-server which applies handler to incoming data
			  "tcp-server-thread"))
	     (run-thread (make-thread
			  (lambda ()

    ;; (debug:print 0 *default-log-port* "INFO: found server(s) already running for db "dbfname", "(string-intersperse servers ",")" Exiting.")
    ;; (exit)))))
    ))

(define (tt:keep-running ttdat dbfname dbstruct)
  ;; verfiy conn for ready
  ;; listener socket has been started by this stage
  ;; wait for a port before creating the registration file
  ;;
  (let* ((cleanup (lambda ()
		    (if (tt-cleanup-proc ttdat)
			((tt-cleanup-proc ttdat))))))
    (let loop ((count 0))
      (if (> count 60)
	  (begin
	    (debug:print 0 *default-log-port* "FATAL: Could not start a tcp server, giving up.")
	    (exit 1))
	  (if (not (tt-port ttdat)) ;; no connection yet
	      (let* ((last-update (dbr:dbstruct-last-update dbstruct))
		     (curr-secs   (current-seconds)))
		(if (> (- curr-secs last-update) 3) ;; every 3-4 seconds update the db? maybe this should be refresh the inmem?
		    (begin
		      ((dbr:dbstruct-sync-proc dbstruct) last-update)
		      (dbr:dbstruct-last-update-set! curr-secs)))
		(thread-sleep! 0.25)
		(loop (+ count 1))))))
    
    (tt:create-server-registration-file ttdat dbfname)
    ;; now start watching the last-access, if it hasn't been touched
    ;; in over ten seconds we exit
    (thread-sleep! 0.05) ;; any real need for delay here?
    (let loop ()
      (let* ((servers (tt:get-server-info-sorted ttdat dbfname))
	     (ok      (cond
		       ((null? servers) #f) ;; not ok
		       ((equal? (list-ref (car servers) 6) ;; compare the servinfofile
				(tt-servinf-file ttdat))
			(debug:print-info 0 *default-log-port* "Keep running, I'm the top server.")
			#t)
		       (else
			(debug:print-info 0 *default-log-port* "I'm not the lead server: "servers)
			(let* ((leadsrv (car servers)))
			  (match leadsrv
			    ((host port startseconds server-id pid dbfname servinfofile)
			     (if (tt:ping host port server-id)
				 #f ;; not the server, but all good, want to exit
				 (if (and (file-exists? servinfofile)
					  (> (- (current-seconds)(file-modification-time servinfofile)) 5))
				     (begin

				       ;; can't ping and file has been on disk 5 seconds, go ahead and try to remove it
				       (debug:print-info 0 *default-log-port* "Removing apparently dead server info file: "servinfofile)
				       (delete-file* servinfofile)
				       #t) ;; not the server but the server is not reachable
				     #t)))
			    (else ;; should never get here
			     (debug:print 0 *default-log-port* "BAD SERVER RECORD: "leadsrv)
			     (assert #f "Bad server record "leadsrv))))))))
	(if ok
	    ;; (if (> *api-process-request-count* 0) ;; have requests in flight
	    ;;	(tt-last-access-set! ttdat (current-seconds)))
	    (tt-last-access-set! ttdat *db-last-access*) ;; bit silly, just use db-last-access
	    (begin
	      (cleanup)
	      (exit)))
	
	(if (< (- (current-seconds) (tt-last-access ttdat)) 60)
	    (begin
	      (thread-sleep! 5)

;;     SERVER STARTED: 10.38.175.67:50216 AT 1616502350.0 server-id: 4907e90fc55c7a09694e3f658c639cf4 
;;
(define (tt:server-get-info logf)
  (let ((server-rx    (regexp "^SERVER STARTED: (\\S+):(\\d+) AT ([\\d\\.]+) server-id: (\\S+) pid: (\\d+) dbfname: (\\S+)")) ;; SERVER STARTED: host:port AT timesecs server id
        (dbprep-rx    (regexp "^SERVER: dbprep"))
        (dbprep-found 0)
	(bad-dat      (list #f #f #f #f #f #f logf)))
     (let ((fdat     (handle-exceptions
			 exn
		       (begin
			 ;; WARNING: this is potentially dangerous to blanket ignore the errors

			 (debug:print-info 0 *default-log-port* "Unable to get server info from "logf", exn=" exn)
			 '()) ;; no idea what went wrong, call it a bad server, return empty list
		       (with-input-from-file logf read-lines))))

       (if (null? fdat) ;; bad data, return bad-dat
	   bad-dat
	   (let loop ((inl  (car fdat))
		      (tail (cdr fdat))
		      (lnum 0))

	     (let ((mlst (string-match server-rx inl))
		   (dbprep (string-match dbprep-rx inl)))
	       (if dbprep (set! dbprep-found 1))
	       (if (not mlst)
		   (if (> lnum 500) ;; give up if more than 500 lines of server log read
		       bad-dat


		       (if (null? tail)
			   bad-dat
			   (loop (car tail)(cdr tail)(+ lnum 1))))
		   (match mlst ;; have a not null list
		     ((_ host port start server-id pid dbfname)
		      (list host
			    (string->number port)
			    (string->number start)
			    server-id
			    (string->number pid)
			    dbfname
			    logf))
		     (else
		      (debug:print 0 *default-log-port* "ERROR: did not recognise SERVER line info "mlst)







		      bad-dat)))))))))

;; Given an area path,  start a server process    ### NOTE ### > file 2>&1 
;; if the target-host is set 
;; try running on that host
;;   incidental: rotate logs in logs/ dir.
;;
(define  (tt:server-process-run areapath testsuite mtexe run-id #!key (profile-mode "")) ;; areapath is *toppath* for a given testsuite area
  (assert areapath  "FATAL: tt:server-process-run called without areapath defined.")
  (assert testsuite "FATAL: tt:server-process-run called without testsuite defined.")
  (assert mtexe     "FATAL: tt:server-process-run called without mtexe defined.")
  (let* ((logfile   (conc areapath "/logs/server.log")) ;; -" curr-pid "-" target-host ".log"))
	 (cmdln     (conc
		     mtexe
		     " -server - ";; (or target-host "-")
		     " -m testsuite:" testsuite
		     ;; " -run-id " (or run-id "main") ;; NO, we do NOT want to have run id as part of this
		     " -db "  (dbmod:run-id->dbfname run-id)
		     " " profile-mode
		     ))) ;; (conc " >> " logfile " 2>&1 &")))))
    ;; we want the remote server to start in *toppath* so push there
    ;; (push-directory areapath) ;; use cd in the command line instead
    (debug:print 0 *default-log-port* "INFO: Trying to start server in tcp mode (" cmdln ") at "(common:human-time)"...")
    ;; (debug:print 0 *default-log-port* "INFO: starting server at " (common:human-time))

  (let* ((tlsn (tcp-listen port 1000 #f)) ;; (tcp-listen TCPPORT [BACKLOG [HOST]])
	 (addr  (tt:get-best-guess-address (get-host-name)))) ;; (get-my-best-address))) ;; (hostinfo-addresses (host-information (current-hostname)))
    (tt-port-set!      uconn port)
    (tt-host-set!      uconn addr)
    (tt-host-port-set! uconn (conc addr":"port))
    (tt-socket-set!    uconn tlsn)
    uconn))



;;======================================================================
;; utils
;;======================================================================

;; Generate a unique signature for this server
(define (tt:mk-signature areapath)