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server.scm at [673fea48bc]
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File server.scm artifact b72b3224b4 part of check-in 673fea48bc



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

(require-extension (srfi 18) extras tcp s11n)

(use srfi-1 posix regex regex-case srfi-69 hostinfo md5 message-digest
     directory-utils posix-extras matchable)

(use spiffy uri-common intarweb http-client spiffy-request-vars)

(declare (unit server))

(declare (uses common))
(declare (uses db))
(declare (uses tasks)) ;; tasks are where stuff is maintained about what is running.
;; (declare (uses synchash))
(declare (uses http-transport))
;;(declare (uses rpc-transport))
(declare (uses launch))
;; (declare (uses daemon))

(include "common_records.scm")
(include "db_records.scm")

(define (server:make-server-url hostport)
  (if (not hostport)
      #f
      (conc "http://" (car hostport) ":" (cadr hostport))))

(define  *server-loop-heart-beat* (current-seconds))

;;======================================================================
;; P K T S   S T U F F 
;;======================================================================

;; ???

;;======================================================================
;; P K T S   S T U F F 
;;======================================================================

;; ???

;;======================================================================
;; S E R V E R
;;======================================================================

;; Call this to start the actual server
;;

;; all routes though here end in exit ...
;;
;; start_server
;;
(define (server:launch run-id transport-type)
  (case transport-type
    ((http)(http-transport:launch))
    ;;((nmsg)(nmsg-transport:launch run-id))
    ;;((rpc)  (rpc-transport:launch run-id))
    (else (debug:print-error 0 *default-log-port* "unknown server type " transport-type))))

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

;; Get the transport
(define (server:get-transport)
  (if *transport-type*
      *transport-type*
      (let ((ttype (string->symbol
		    (or (args:get-arg "-transport")
			(configf:lookup *configdat* "server" "transport")
			"rpc"))))
	(set! *transport-type* ttype)
	ttype)))
	    
;; Generate a unique signature for this server
(define (server:mk-signature)
  (message-digest-string (md5-primitive) 
			 (with-output-to-string
			   (lambda ()
			     (write (list (current-directory)
					  (argv)))))))

;; When using zmq this would send the message back (two step process)
;; with spiffy or rpc this simply returns the return data to be returned
;; 
(define (server:reply return-addr query-sig success/fail result)
  (debug:print-info 11 *default-log-port* "server:reply return-addr=" return-addr ", result=" result)
  ;; (send-message pubsock target send-more: #t)
  ;; (send-message pubsock 
  (case (server:get-transport)
    ((rpc)  (db:obj->string (vector success/fail query-sig result)))
    ((http) (db:obj->string (vector success/fail query-sig result)))
    ((fs)   result)
    (else 
     (debug:print-error 0 *default-log-port* "unrecognised transport type: " *transport-type*)
     result)))

;; Given a run id start a server process    ### NOTE ### > file 2>&1 
;; if the run-id is zero and the target-host is set 
;; try running on that host
;;   incidental: rotate logs in logs/ dir.
;;
(define  (server:run areapath) ;; areapath is *toppath* for a given testsuite area
  (let* ((curr-host   (get-host-name))
         ;; (attempt-in-progress (server:start-attempted? areapath))
         ;; (dot-server-url (server:check-if-running areapath))
	 (curr-ip     (server:get-best-guess-address curr-host))
	 (curr-pid    (current-process-id))
	 (homehost    (common:get-homehost)) ;; configf:lookup *configdat* "server" "homehost" ))
	 (target-host (car homehost))
	 (testsuite   (common:get-testsuite-name))
	 (logfile     (conc areapath "/logs/server.log")) ;; -" curr-pid "-" target-host ".log"))
	 (cmdln (conc (common:get-megatest-exe)
		      " -server " (or target-host "-") (if (equal? (configf:lookup *configdat* "server" "daemonize") "yes")
							   " -daemonize "
							   "")
		      ;; " -log " logfile
		      " -m testsuite:" testsuite)) ;; (conc " >> " logfile " 2>&1 &")))))
	 (log-rotate  (make-thread common:rotate-logs  "server run, rotate logs thread"))
         (load-limit  (configf:lookup-number *configdat* "jobtools" "max-server-start-load" default: 3.0)))
    ;; we want the remote server to start in *toppath* so push there
    (push-directory areapath)
    (debug:print 0 *default-log-port* "INFO: Trying to start server (" cmdln ") ...")
    (thread-start! log-rotate)
    
    ;; host.domain.tld match host?
    (if (and target-host 
	     ;; look at target host, is it host.domain.tld or ip address and does it 
	     ;; match current ip or hostname
	     (not (string-match (conc "("curr-host "|" curr-host"\\..*)") target-host))
	     (not (equal? curr-ip target-host)))
	(begin
	  (debug:print-info 0 *default-log-port* "Starting server on " target-host ", logfile is " logfile)
	  (setenv "TARGETHOST" target-host)))
      
    (setenv "TARGETHOST_LOGF" logfile)
    (thread-sleep! (/ (random 5000) 1000)) ;; add about a random (up to 5 seconds) initial delay. It seems pretty common that many running tests request a server at the same time
    (common:wait-for-normalized-load load-limit " delaying server start due to load" target-host) ;; do not try starting servers on an already overloaded machine, just wait forever
    (system (conc "nbfake " cmdln))
    (unsetenv "TARGETHOST_LOGF")
    (if (get-environment-variable "TARGETHOST")(unsetenv "TARGETHOST"))
    (thread-join! log-rotate)
    (pop-directory)))

;; given a path to a server log return: host port startseconds
;;
(define (server:logf-get-start-info logf)
  (let ((rx (regexp "^SERVER STARTED: (\\S+):(\\d+) AT ([\\d\\.]+)"))) ;; SERVER STARTED: host:port AT timesecs
    (handle-exceptions
	exn
	(list #f #f #f) ;; no idea what went wrong, call it a bad server
      (with-input-from-file
	  logf
	(lambda ()
	  (let loop ((inl  (read-line))
		     (lnum 0))
	    (if (not (eof-object? inl))
		(let ((mlst (string-match rx inl)))
		  (if (not mlst)
		      (if (< lnum 500) ;; give up if more than 500 lines of server log read
			  (loop (read-line)(+ lnum 1))
			  (list #f #f #f))
		      (let ((dat  (cdr mlst)))
			(list (car dat) ;; host
			      (string->number (cadr dat)) ;; port
			      (string->number (caddr dat))))))
		(list #f #f #f))))))))

;; get a list of servers with all relevant data
;; ( mod-time host port start-time pid )
;;
(define (server:get-list areapath #!key (limit #f))
  (let ((fname-rx    (regexp "^(|.*/)server-(\\d+)-(\\S+).log$"))
	(day-seconds (* 24 60 60)))
    ;; if the directory exists continue to get the list
    ;; otherwise attempt to create the logs dir and then
    ;; continue
    (if (if (directory-exists? (conc areapath "/logs"))
	    '()
	    (if (file-write-access? areapath)
		(begin
		  (condition-case
		      (create-directory (conc areapath "/logs") #t)
		    (exn (i/o file)(debug:print 0 *default-log-port* "ERROR: Cannot create directory at " (conc areapath "/logs")))
		    (exn ()(debug:print 0 *default-log-port* "ERROR: Unknown error attemtping to get server list.")))
		  (directory-exists? (conc areapath "/logs")))
		'()))
	(let* ((server-logs   (glob (conc areapath "/logs/server-*.log")))
	       (num-serv-logs (length server-logs)))
	  (if (null? server-logs)
	      '()
	      (let loop ((hed  (car server-logs))
			 (tal  (cdr server-logs))
			 (res '()))
		(let* ((mod-time  (handle-exceptions
				      exn
				      (current-seconds) ;; 0
				    (file-modification-time hed))) ;; default to *very* old so log gets ignored if deleted
		       (down-time (- (current-seconds) mod-time))
		       (serv-dat  (if (or (< num-serv-logs 10)
				  	  (< down-time 900)) ;; day-seconds))
				      (server:logf-get-start-info hed)
				      '())) ;; don't waste time processing server files not touched in the 15 minutes if there are more than ten servers to look at
		       (serv-rec (cons mod-time serv-dat))
		       (fmatch   (string-match fname-rx hed))
		       (pid      (if fmatch (string->number (list-ref fmatch 2)) #f))
		       (new-res  (if (null? serv-dat)
				     res
				     (cons (append serv-rec (list pid)) res))))
		(if (null? tal)
		    (if (and limit
			     (> (length new-res) limit))
			new-res ;; (take new-res limit)  <= need intelligent sorting before this will work
			new-res)
		    (loop (car tal)(cdr tal) new-res)))))))))

(define (server:get-num-alive srvlst)
  (let ((num-alive 0))
    (for-each
     (lambda (server)
       (match-let (((mod-time host port start-time pid)
		    server))
	 (let* ((uptime  (- (current-seconds) mod-time))
		(runtime (if start-time
			     (- mod-time start-time)
			     0)))
	   (if (< uptime 5)(set! num-alive (+ num-alive 1))))))
     srvlst)
    num-alive))

;; given a list of servers get a list of valid servers, i.e. at least
;; 10 seconds old, has started and is less than 1 hour old and is
;; active (i.e. mod-time < 10 seconds
;;
;; mod-time host port start-time pid
;;
;; sort by start-time descending. I.e. get the oldest first. Young servers will thus drop off
;; and servers should stick around for about two hours or so.
;;
(define (server:get-best srvlst)
  (let* ((nums (server:get-num-servers))
	 (now  (current-seconds))
	 (slst (sort
		(filter (lambda (rec)
			  (if (and (list? rec)
				   (> (length rec) 2))
			      (let ((start-time (list-ref rec 3))
				    (mod-time   (list-ref rec 0)))
				;; (print "start-time: " start-time " mod-time: " mod-time)
				(and start-time mod-time
				     (> (- now start-time) 0)    ;; been running at least 0 seconds
				     (< (- now mod-time)   16)   ;; still alive - file touched in last 16 seconds
				     (< (- now start-time)       
					(+ (- (string->number (or (configf:lookup *configdat* "server" "runtime") "3600"))
					      180)
					   (random 360))) ;; under one hour running time +/- 180
				     ))
			      #f))
			srvlst)
		(lambda (a b)
		  (< (list-ref a 3)
		     (list-ref b 3))))))
    (if (> (length slst) nums)
	(take slst nums)
	slst)))

(define (server:get-first-best areapath)
  (let ((srvrs (server:get-best (server:get-list areapath))))
    (if (and srvrs
	     (not (null? srvrs)))
	(car srvrs)
	#f)))

(define (server:get-rand-best areapath)
  (let ((srvrs (server:get-best (server:get-list areapath))))
    (if (and (list? srvrs)
	     (not (null? srvrs)))
	(let* ((len (length srvrs))
	       (idx (random len)))
	  (list-ref srvrs idx))
	#f)))


(define (server:record->url servr)
  (match-let (((mod-time host port start-time pid)
	       servr))
    (if (and host port)
	(conc host ":" port)
	#f)))

(define (server:get-client-signature) ;; BB> why is this proc named "get-"?  it returns nothing -- set! has not return value.
  (if *my-client-signature* *my-client-signature*
      (let ((sig (server:mk-signature)))
        (set! *my-client-signature* sig)
        *my-client-signature*)))

;; kind start up of servers, wait 40 seconds before allowing another server for a given
;; run-id to be launched
(define (server:kind-run areapath)
  (if (not (server:check-if-running areapath)) ;; why try if there is already a server running?
      (let* ((last-run-dat (hash-table-ref/default *server-kind-run* areapath '(0 0))) ;; callnum, whenrun
	     (call-num     (car last-run-dat))
	     (when-run     (cadr last-run-dat))
	     (run-delay    (+ (case call-num
				((0)    0)
				((1)   20)
				((2)  300)
				(else 600))
			      (random 5)))   ;; add a small random number just in case a lot of jobs hit the work hosts simultaneously
	     (lock-file    (conc areapath "/logs/server-start.lock")))
	(if	(> (- (current-seconds) when-run) run-delay)
		(begin
		  (common:simple-file-lock-and-wait lock-file expire-time: 15)
		  (server:run areapath)
		  (thread-sleep! 5) ;; don't release the lock for at least a few seconds
		  (common:simple-file-release-lock lock-file)))
	(hash-table-set! *server-kind-run* areapath (list (+ call-num 1)(current-seconds))))))

(define (server:start-and-wait areapath #!key (timeout 60))
  (let ((give-up-time (+ (current-seconds) timeout)))
    (let loop ((server-url (server:check-if-running areapath))
	       (try-num    0))
      (if (or server-url
	      (> (current-seconds) give-up-time)) ;; server-url will be #f if no server available.
	  server-url
	  (let ((num-ok (length (server:get-best (server:get-list areapath)))))
	    (if (and (> try-num 0)  ;; first time through simply wait a little while then try again
		     (< num-ok 1))  ;; if there are no decent candidates for servers then try starting a new one
		(server:kind-run areapath))
	    (thread-sleep! 5)
	    (loop (server:check-if-running areapath)
		  (+ try-num 1)))))))

(define server:try-running server:run) ;; there is no more per-run servers ;; REMOVE ME. BUG.

(define (server:get-num-servers #!key (numservers 2))
  (let ((ns (string->number
	     (or (configf:lookup *configdat* "server" "numservers") "notanumber"))))
    (or ns numservers)))

;; no longer care if multiple servers are started by accident. older servers will drop off in time.
;;
(define (server:check-if-running areapath) ;;  #!key (numservers "2"))
  (let* ((ns            (server:get-num-servers))
	 (servers       (server:get-best (server:get-list areapath))))
    ;; (print "servers: " servers " ns: " ns)
    (if (or (and servers
		 (null? servers))
	    (not servers)
	    (and (list? servers)
		 (< (length servers) (random ns)))) ;; somewhere between 0 and numservers
        #f
        (let loop ((hed (car servers))
                   (tal (cdr servers)))
          (let ((res (server:check-server hed)))
            (if res
                res
                (if (null? tal)
                    #f
                    (loop (car tal)(cdr tal)))))))))

;; ping the given server
;;
(define (server:check-server server-record)
  (let* ((server-url (server:record->url server-record))
         (res        (case *transport-type*
                       ((http)(server:ping server-url))
                       ;; ((nmsg)(nmsg-transport:ping (tasks:hostinfo-get-interface server)
                       )))
    (if res
        server-url
	#f)))

(define (server:kill servr)
  (match-let (((mod-time hostname port start-time pid)
	       servr))
    (tasks:kill-server hostname pid)))

;; called in megatest.scm, host-port is string hostname:port
;;
;; NOTE: This is NOT called directly from clients as not all transports support a client running
;;       in the same process as the server.
;;
(define (server:ping host-port-in #!key (do-exit #f))
  (let ((host:port (if (not host-port-in) ;; use read-dotserver to find
		       #f ;; (server:check-if-running *toppath*)
		;; (if (number? host-port-in) ;; we were handed a server-id
		;; 	   (let ((srec (tasks:get-server-by-id (db:delay-if-busy (tasks:open-db)) host-port-in)))
		;; 	     ;; (print "srec: " srec " host-port-in: " host-port-in)
		;; 	     (if srec
		;; 		 (conc (vector-ref srec 3) ":" (vector-ref srec 4))
		;; 		 (conc "no such server-id " host-port-in)))
		       host-port-in))) ;; )
    (let* ((host-port (if host:port
			  (let ((slst (string-split   host:port ":")))
			    (if (eq? (length slst) 2)
				(list (car slst)(string->number (cadr slst)))
				#f))
			  #f)))
;;	   (toppath       (launch:setup)))
      ;; (print "host-port=" host-port)
      (if (not host-port)
	  (begin
	    (if host-port-in
		(debug:print 0 *default-log-port*  "ERROR: bad host:port"))
	    (if do-exit (exit 1))
	    #f)
	  (let* ((iface      (car host-port))
		 (port       (cadr host-port))
		 (server-dat (http-transport:client-connect iface port))
		 (login-res  (rmt:login-no-auto-client-setup server-dat)))
	    (if (and (list? login-res)
		     (car login-res))
		(begin
		  ;; (print "LOGIN_OK")
		  (if do-exit (exit 0))
		  #t)
		(begin
		  ;; (print "LOGIN_FAILED")
		  (if do-exit (exit 1))
		  #f)))))))

;; run ping in separate process, safest way in some cases
;;
(define (server:ping-server ifaceport)
  (with-input-from-pipe 
   (conc (common:get-megatest-exe) " -ping " ifaceport)
   (lambda ()
     (let loop ((inl (read-line))
		(res "NOREPLY"))
       (if (eof-object? inl)
	   (case (string->symbol res)
	     ((NOREPLY)  #f)
	     ((LOGIN_OK) #t)
	     (else       #f))
	   (loop (read-line) inl))))))

;; NOT USED (well, ok, reference in rpc-transport but otherwise not used).
;;
(define (server:login toppath)
  (lambda (toppath)
    (set! *db-last-access* (current-seconds)) ;; might not be needed.
    (if (equal? *toppath* toppath)
	#t
	#f)))

;; timeout is hms string: 1h 5m 3s, default is 1 minute
;;
(define (server:expiration-timeout)
  (let ((tmo (configf:lookup *configdat* "server" "timeout")))
    (if (and (string? tmo)
	     (common:hms-string->seconds tmo)) ;; BUG: hms-string->seconds is broken, if given "10" returns 0. Also, it doesn't belong in this logic unless the string->number is changed below
        (* 3600 (string->number tmo))
	60)))

(define (server:get-best-guess-address hostname)
  (let ((res #f))
    (for-each 
     (lambda (adr)
       (if (not (eq? (u8vector-ref adr 0) 127))
	   (set! res adr)))
     ;; NOTE: This can fail when there is no mention of the host in /etc/hosts. FIXME
     (vector->list (hostinfo-addresses (hostname->hostinfo hostname))))
    (string-intersperse 
     (map number->string
	  (u8vector->list
	   (if res res (hostname->ip hostname)))) ".")))

;; (define server:sync-lock-token "SERVER_SYNC_LOCK")
;; (define (server:release-sync-lock)
;;   (db:no-sync-del! *no-sync-db* server:sync-lock-token))
;; (define (server:have-sync-lock?)
;;   (let* ((have-lock-pair (db:no-sync-get-lock *no-sync-db* server:sync-lock-token))
;;          (have-lock?     (car have-lock-pair))
;;          (lock-time      (cdr have-lock-pair))
;;          (lock-age       (- (current-seconds) lock-time)))
;;     (cond
;;      (have-lock? #t)
;;      ((>lock-age
;;        (* 3 (configf:lookup-number *configdat* "server" "minimum-intersync-delay" default: 180)))
;;       (server:release-sync-lock)
;;       (server:have-sync-lock?))
;;      (else #f))))

;; moving this here as it needs access to db and cannot be in common.
;;
(define (server:writable-watchdog dbstruct)
  (thread-sleep! 10) ;; delay for startup
  (let* ((legacy-sync  (common:run-sync?))
         (sqlite-exe   (or (get-environment-variable "MT_SQLITE3_EXE"))) ;; defined in cfg.sh
         (sync-log     (or (args:get-arg "-sync-log") (conc *toppath* "/logs/sync-" (current-process-id) "-" (get-host-name) ".log")))
	 (tmp-area     (common:get-db-tmp-area))
	 (tmp-db       (conc tmp-area "/megatest.db"))
	 (staging-file (conc *toppath* "/.megatest.db"))
	 (mtdbfile     (conc *toppath* "/megatest.db"))
	 (lockfile     (conc tmp-db ".lock"))
         (sync-cmd     (conc sqlite-exe" " tmp-db " .dump | "sqlite-exe" " staging-file "&>"sync-log))
	 (min-intersync-delay (configf:lookup-number *configdat* "server" "minimum-intersync-delay" default: 30)))
    (if (and (not (args:get-arg "-sync-to-megatest.db")) ;; conditions under which we do not run the sync
	     (args:get-arg "-server"))
	(let loop ()
          (debug:print 0 *default-log-port* "INFO: syncer thread sleeping for server.minimum-intersync-delay seconds ["min-intersync-delay"]")
	  (thread-sleep! min-intersync-delay)
	  (if (common:simple-file-lock lockfile)
	      (begin
                
                (if (not (configf:lookup *configdat* "server" "disable-db-snapshot"))
                    (common:snapshot-file mtdbfile subdir: ".db-snapshot"))
		(delete-file* staging-file)
		(let* ((start-time (current-milliseconds))
                       (res (system sync-cmd)))
                  (cond
                   ((eq? 0 res)
		    (delete-file* (conc mtdbfile ".backup"))
		    (system (conc "/bin/mv " staging-file " " mtdbfile))
                    (debug:print 1 *default-log-port* "INFO: ["(common:human-time)"] pid="(current-process-id)" SYNC took "(/ (- (current-milliseconds) start-time) 1000)" sec")
                    #t)
                   (else
                    (system (conc "/bin/cp "sync-log" "sync-log".fail"))
                    (debug:print 0 *default-log-port* "ERROR: ["(common:human-time)"] Sync failed. See log at "sync-log".fail")
                    (if (file-exists? (conc mtdbfile ".backup"))
                        (system (conc "/bin/cp "mtdbfile ".backup " mtdbfile)))))
                  (common:simple-file-release-lock lockfile)))
              ;; else
              (debug:print 1 *default-log-port* "INFO: ["(common:human-time)"] pid="(current-process-id)" other SYNC in progress; not syncing.")
              ) ;; end if got lockfile
	  
	  ;; keep going unless time to exit
	  ;;
	  (if (not *time-to-exit*)
	      (let delay-loop ((count 0))
		;;(debug:print-info 13 *default-log-port* "delay-loop top; count="count" pid="(current-process-id)" this-wd-num="this-wd-num" *time-to-exit*="*time-to-exit*)
		
		(if (and (not *time-to-exit*)
			 (< count 6)) ;; was 11, changing to 4. 
		    (begin
		      (thread-sleep! 1)
		      (delay-loop (+ count 1))))
		(if (not *time-to-exit*) (loop))))
	  ;; time to exit, close the no-sync db here
	  ;; (db:no-sync-close-db no-sync-db)
	  (if (common:low-noise-print 30)
	      (debug:print-info 0 *default-log-port* "Exiting watchdog timer, *time-to-exit* = " *time-to-exit*" pid="(current-process-id)
				))))))

;;   (let ((legacy-sync  (common:run-sync?)))
;;         (sync-stale-seconds (configf:lookup-number *configdat* "server" "sync-stale-seconds" default: 300))
;; 	(debug-mode   (debug:debug-mode 1))
;; 	(last-time    (current-seconds))
;; 	(no-sync-db   (db:open-no-sync-db))
;;         (sync-duration 0) ;; run time of the sync in milliseconds
;;         ;;(this-wd-num  (begin (mutex-lock! *wdnum*mutex) (let ((x *wdnum*)) (set! *wdnum* (add1 *wdnum*)) (mutex-unlock! *wdnum*mutex) x)))
;;         )
;;     (set! *no-sync-db* no-sync-db) ;; make the no sync db available to api calls
;;     (debug:print-info 2 *default-log-port* "Periodic sync thread started.")
;;     (debug:print-info 3 *default-log-port* "watchdog starting. legacy-sync is " legacy-sync" pid="(current-process-id)  );;  " this-wd-num="this-wd-num)
;;     (if (and legacy-sync (not *time-to-exit*))
;; 	(let* (;;(dbstruct (db:setup))
;; 	       (mtdb       (dbr:dbstruct-mtdb dbstruct))
;; 	       (mtpath     (db:dbdat-get-path mtdb))
;; 	       (tmp-area   (common:get-db-tmp-area))
;; 	       (lockfile   (conc tmp-area "/megatest.db.lock"))
;; 	       (start-file (conc tmp-area "/.start-sync"))
;; 	       (end-file   (conc tmp-area "/.end-sync")))
;; 	  (debug:print-info 0 *default-log-port* "Server running, periodic sync started.")
;; 	  (let loop ()
;; 	    ;; sync for filesystem local db writes
;; 	    ;;
;; 	    
;; 	    (mutex-lock! *db-multi-sync-mutex*)
;; 		  (let* ((need-sync        (>= *db-last-access* *db-last-sync*)) ;; no sync since last write
;; 			 (sync-in-progress *db-sync-in-progress*)
;; 			 
;; 			 (min-intersync-delay (configf:lookup-number *configdat* "server" "minimum-intersync-delay" default: 5))
;; 			 (should-sync      (and (not *time-to-exit*)
;; 						(> (- (current-seconds) *db-last-sync*) min-intersync-delay))) ;; sync every five seconds minimum, deprecated logic, can probably be removed
;; 			 (start-time       (current-seconds))
;; 			 (cpu-load-adj     (alist-ref 'adj-proc-load (common:get-normalized-cpu-load #f)))
;; 			 (mt-mod-time      (file-modification-time mtpath))
;; 			 (last-sync-start  (if (common:file-exists? start-file)
;; 					       (file-modification-time start-file)
;; 					       0))
;; 			 (last-sync-end    (if (common:file-exists? end-file)
;; 					       (file-modification-time end-file)
;; 					       10))
;; 			 (sync-period      (+ 3 (* cpu-load-adj 30))) ;; as adjusted load increases increase the sync period
;; 			 (recently-synced  (and (< (- start-time mt-mod-time) sync-period) ;; not useful if sync didn't modify megatest.db!
;; 						(< mt-mod-time last-sync-start)))
;; 			 (sync-done        (<= last-sync-start last-sync-end))
;; 			 (sync-stale       (> start-time (+ last-sync-start sync-stale-seconds)))
;; 			 (will-sync-pre        (and (not *time-to-exit*)       ;; do not start a sync if we are in the process of exiting
;; 						    have-lock?
;; 						    (or need-sync should-sync)
;; 						    (or sync-done sync-stale)
;; 						    (not sync-in-progress)
;; 						    (not recently-synced)))
;; 			 (will-sync        (if will-sync-pre
;; 					       ;; delay get lock until we decide to sync
;; 					       #t ;; (server:have-sync-lock?) 
;; 					       #f)))
;; 		    ;; if another server is syncing, postpone sync
;; 		    (if (and will-sync-pre (not will-sync))
;; 			(set! *db-last-sync* start-time))
;; 		    (debug:print-info 13 *default-log-port* "WD writable-watchdog top of loop.  need-sync="need-sync" sync-in-progress=" sync-in-progress
;; 				      " should-sync="should-sync" start-time="start-time" mt-mod-time="mt-mod-time" recently-synced="recently-synced" will-sync="will-sync
;; 				      " sync-done=" sync-done " sync-period=" sync-period)
;; 		    (if (and (> sync-period 5)
;; 			     (common:low-noise-print 30 "sync-period"))
;; 			(debug:print-info 0 *default-log-port* "Increased sync period due to long sync times, sync took: " sync-period " seconds."))
;; 		    ;; (if recently-synced (debug:print-info 0 *default-log-port* "Skipping sync due to recently-synced flag=" recently-synced))
;; 		    ;; (debug:print-info 0 *default-log-port* "need-sync: " need-sync " sync-in-progress: " sync-in-progress " should-sync: " should-sync " will-sync: " will-sync)
;; 		    (if will-sync (set! *db-sync-in-progress* #t))
;; 		    (mutex-unlock! *db-multi-sync-mutex*)
;; 		    (if will-sync
;; 			(let (;; (max-sync-duration  (configf:lookup-number *configdat* "server" "max-sync-duration")) ;; KEEPING THIS AVAILABLE BUT SHOULD NOT USE, I'M PRETTY SURE IT DOES NOT WORK!
;; 			      (sync-start         (current-milliseconds)))
;; 			  (with-output-to-file start-file (lambda ()(print (current-process-id))))
;; 			  
;; 			  ;; put lock here
;; 			  
;; 			  ;; (if (or (not max-sync-duration)
;; 			  ;;        (< sync-duration max-sync-duration)) ;; NOTE: db:sync-to-megatest.db keeps track of time of last sync and syncs incrementally
;; 			  (let ((res        (db:sync-to-megatest.db dbstruct no-sync-db: no-sync-db))) ;; did we sync any data? If so need to set the db touched flag to keep the server alive
;; 			    (set! sync-duration (- (current-milliseconds) sync-start))
;; 			    (if (> res 0) ;; some records were transferred, keep the db alive
;; 				(begin
;; 				  (mutex-lock! *heartbeat-mutex*)
;; 				  (set! *db-last-access* (current-seconds))
;; 				  (mutex-unlock! *heartbeat-mutex*)
;; 				  (debug:print-info 0 *default-log-port* "sync called, " res " records transferred."))
;; 				(debug:print-info 2 *default-log-port* "sync called but zero records transferred")))))
;; 		    ;;                         ;; TODO: factor this next routine out into a function
;; 		    ;;                         (with-input-from-pipe ;; this should not block other threads but need to verify this
;; 		    ;;                          (conc "megatest -sync-to-megatest.db -m testsuite:" (common:get-area-name) ":" *toppath*)
;; 		    ;;                          (lambda ()
;; 		    ;;                            (let loop ((inl (read-line))
;; 		    ;;                                       (res #f))
;; 		    ;;                              (if (eof-object? inl)
;; 		    ;;                                  (begin
;; 		    ;;                                    (set! sync-duration (- (current-milliseconds) sync-start))
;; 		    ;;                                    (cond
;; 		    ;;                                     ((not res)
;; 		    ;;                                      (debug:print 0 *default-log-port* "ERROR: sync from /tmp db to megatest.db appears to have failed. Recommended that you stop your runs and run \"megatest -cleanup-db\""))
;; 		    ;;                                     ((> res 0)
;; 		    ;;                                      (mutex-lock! *heartbeat-mutex*)
;; 		    ;;                                      (set! *db-last-access* (current-seconds))
;; 		    ;;                                      (mutex-unlock! *heartbeat-mutex*))))
;; 		    ;;                                  (let ((num-synced (let ((matches (string-match "^Synced (\\d+).*$" inl)))
;; 		    ;;                                                      (if matches
;; 		    ;;                                                          (string->number (cadr matches))
;; 		    ;;                                                          #f))))
;; 		    ;;                                    (loop (read-line)
;; 		    ;;                                          (or num-synced res))))))))))
;; 		    (if will-sync
;; 			(begin
;; 			  (mutex-lock! *db-multi-sync-mutex*)
;; 			  (set! *db-sync-in-progress* #f)
;; 			  (set! *db-last-sync* start-time)
;; 			  (with-output-to-file end-file (lambda ()(print (current-process-id))))
;; 
;; 			  ;; release lock here
;; 			  ;; (server:release-sync-lock)
;; 			  (mutex-unlock! *db-multi-sync-mutex*)))
;; 		    (if (and debug-mode
;; 			     (> (- start-time last-time) 60))
;; 			(begin
;; 			  (set! last-time start-time)
;; 			  (debug:print-info 4 *default-log-port* "timestamp -> " (seconds->time-string (current-seconds)) ", time since start -> " (seconds->hr-min-sec (- (current-seconds) *time-zero*))))))
;; 		  
;; 		  ;; keep going unless time to exit
;; 		  ;;
;; 		  (if (not *time-to-exit*)
;; 		      (let delay-loop ((count 0))
;; 			;;(debug:print-info 13 *default-log-port* "delay-loop top; count="count" pid="(current-process-id)" this-wd-num="this-wd-num" *time-to-exit*="*time-to-exit*)
;; 			
;; 			(if (and (not *time-to-exit*)
;; 				 (< count 6)) ;; was 11, changing to 4. 
;; 			    (begin
;; 			      (thread-sleep! 1)
;; 			      (delay-loop (+ count 1))))
;; 			(if (not *time-to-exit*) (loop))))
;; 		  ;; time to exit, close the no-sync db here
;; 		  (db:no-sync-close-db no-sync-db)
;; 		  (if (common:low-noise-print 30)
;; 		      (debug:print-info 0 *default-log-port* "Exiting watchdog timer, *time-to-exit* = " *time-to-exit*" pid="(current-process-id) ))))))) ;;" this-wd-num="this-wd-num)))))))