Megatest

			  (case *transport-type* 
			    ((http)(http-transport:close-connections)))
			  (remote-conndat-set! runremote #f)  ;; (hash-table-delete! runremote run-id)
			  (thread-sleep! 1)
			  (client:setup-http areapath remaining-tries: (- remaining-tries 1))
			  )))
		  (begin    ;; no server registered
		    ;; (server:kind-run areapath)
		    (server:start-and-wait areapath)
		    (debug:print-info 0 *default-log-port* "client:setup, no server registered, remaining-tries=" remaining-tries)
		    (thread-sleep! 1) ;; (+ 5 (random (- 20 remaining-tries))))  ;; give server a little time to start up, randomize a little to avoid start storms.

		    (client:setup-http areapath remaining-tries: (- remaining-tries 1)))))))))

(defstruct remote
  (hh-dat            (common:get-homehost)) ;; homehost record ( addr . hhflag )
  (server-url        (if *toppath* (server:check-if-running *toppath*))) ;; (server:check-if-running *toppath*) #f))
  (last-server-check 0)  ;; last time we checked to see if the server was alive
  (conndat           #f)
  (transport         *transport-type*)
  (server-timeout    (or (server:get-timeout) 100))
  (force-server      #f)) ;; default to 100 seconds

;; launching and hosts
(defstruct host
  (reachable    #f)
  (last-update  0)
  (last-used    0)
  (last-cpuload 1))

     (tags-testpatt
      (debug:print-info 0 *default-log-port* "-tagexpr "tagexpr" selects testpatt "tags-testpatt)
      tags-testpatt)
     ((and (equal? args-testpatt "%") rtestpatt)
      (debug:print-info 0 *default-log-port* "testpatt defined in "testpatt-key" from runconfigs: " rtestpatt)
      rtestpatt)
     (else args-testpatt))))



(define (common:false-on-exception thunk #!key (message #f))
  (handle-exceptions exn
                     (begin
                       (if message
                           (debug:print-info 0 *default-log-port* message))
                       #f) (thunk) ))

(define (common:file-exists? path-string)
  ;; this avoids stack dumps in the case where 

  ;;;; TODO: catch permission denied exceptions and emit appropriate warnings, eg:  system error while trying to access file: "/nfs/pdx/disks/icf_env_disk001/bjbarcla/gwa/issues/mtdev/randy-slow/reproduce/q...
  (common:false-on-exception (lambda () (file-exists? path-string))
                             message: (conc "Unable to access path: " path-string)
                             ))

(define (common:directory-exists? path-string)
  ;;;; TODO: catch permission denied exceptions and emit appropriate warnings, eg:  system error while trying to access file: "/nfs/pdx/disks/icf_env_disk001/bjbarcla/gwa/issues/mtdev/randy-slow/reproduce/q...
  (common:false-on-exception (lambda () (directory-exists? path-string))
                             message: (conc "Unable to access path: " path-string)
                             ))


(define (common:get-linktree)
  (or (getenv "MT_LINKTREE")
      (if *configdat*
	  (configf:lookup *configdat* "setup" "linktree"))))

(define (common:args-get-runname)
  (let ((res (or (args:get-arg "-runname")

;; do we honor the caches of the config files?
;;
(define (common:use-cache?)
  (not (or (args:get-arg "-no-cache")
	   (and *configdat*
		(equal? (configf:lookup *configdat* "setup" "use-cache") "no")))))

;; force use of server?
;;
(define (common:force-server?)
  (let ((force-setting (configf:lookup "server" "force"))
	(force-type    (if force-setting (string->symbol force-setting) #f)))
    (case force-type
      ((#f)     #f)
      ((always) #t)
      ((test)   (if (args:get-arg "-execute") ;; we are in a test
		    #t
		    #f)))))

;;======================================================================
;; M I S C   L I S T S
;;======================================================================

;; items in lista are matched value and position in listb
;; return the remaining items in listb or #f

	 (target   (common:args-get-target))
	 (linktree (common:get-linktree))
	 (sections (if target (list "default" target) #f)) ;; for runconfigs
	 (mtconfig (or (args:get-arg "-config") "megatest.config")) ;; allow overriding megatest.config 
	 (rundir   (if (and runname target linktree)(conc linktree "/" target "/" runname) #f))
	 (mtcachef (and rundir (conc rundir "/" ".megatest.cfg-"  megatest-version "-" megatest-fossil-hash)))
	 (rccachef (and rundir (conc rundir "/" ".runconfigs.cfg-"  megatest-version "-" megatest-fossil-hash)))
	 (cancreate (and rundir (common:file-exists? rundir)(file-write-access? rundir)))
         (cxt       (hash-table-ref/default *contexts* toppath #f)))

    ;; create our cxt for this area if it doesn't already exist
    (if (not cxt)(hash-table-set! *contexts* toppath (make-cxt)))

    ;; (print "runname: " runname " target: " target " mtcachef: " mtcachef " rccachef: " rccachef)
    (set! *toppath* toppath) ;; This is needed when we are running as a test using CMDINFO as a datasource
    (cond
     ;; data was read and cached and available in *configstatus*, toppath has already been set
     ((eq? *configstatus* 'fulldata)
      *toppath*)
     ;; if mtcachef exists just read it, however we need to assume toppath is available in $MT_RUN_AREA_HOME
     ((and mtcachef (common:file-exists? mtcachef) (get-environment-variable "MT_RUN_AREA_HOME") use-cache)
      (set! *configdat*    (configf:read-alist mtcachef))
      (set! *runconfigdat* (configf:read-alist rccachef))
      (set! *configinfo*   (list *configdat*  (get-environment-variable "MT_RUN_AREA_HOME")))
      (set! *configstatus* 'fulldata)
      (set! *toppath*      (get-environment-variable "MT_RUN_AREA_HOME"))
      *toppath*)
     ;; we have all the info needed to fully process runconfigs and megatest.config

	      (debug:print-error 0 *default-log-port* "No " mtconfig " file found. Giving up.")
	      (exit 2))))))
    ;; additional house keeping
    (let* ((linktree (or (getenv "MT_LINKTREE")
			 (if *configdat* (configf:lookup *configdat* "setup" "linktree") #f))))
      (if linktree
	  (begin
	    (if (not (common:file-exists? linktree))
		(begin
		  (handle-exceptions
		   exn
		   (begin
		     (debug:print-error 0 *default-log-port* "Something went wrong when trying to create linktree dir at " linktree)
		     (debug:print 0 *default-log-port* " message: " ((condition-property-accessor 'exn 'message) exn))
		     (exit 1))

	 (lnktarget (conc lnkpath "/" item-path)))

    ;; Update the rundir path in the test record for all, rundir=physical, shortdir=logical
    ;;                                                 rundir   shortdir
    (rmt:general-call 'test-set-rundir-shortdir run-id lnkpathf test-path testname item-path run-id)

    (debug:print 2 *default-log-port* "INFO:\n       lnkbase=" lnkbase "\n       lnkpath=" lnkpath "\n  toptest-path=" toptest-path "\n     test-path=" test-path)
    (if (not (common:file-exists? linktree))
	(begin
	  (debug:print 0 *default-log-port* "WARNING: linktree did not exist! Creating it now at " linktree)
	  (create-directory linktree #t))) ;; (system (conc "mkdir -p " linktree))))
    ;; create the directory for the tests dir links, this is needed no matter what...
    (if (and (not (common:directory-exists? lnkbase))
	     (not (common:file-exists? lnkbase)))
	(handle-exceptions
	 exn
	 (begin
	   (debug:print-error 0 *default-log-port* "Problem creating linktree base at " lnkbase)
	   (print-error-message exn (current-error-port)))
	 (create-directory lnkbase #t)))
    

     ((not (pair? (remote-hh-dat runremote)))  ;; not on homehost
      (thread-sleep! 0.1) ;; since we shouldn't get here, delay a little
      (remote-hh-dat-set! runremote (common:get-homehost))
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  2")
      (rmt:send-receive cmd rid params attemptnum: attemptnum))
     ;; on homehost and this is a read
     ((and (not (remote-force-server runremote))      ;; honor forced use of server
	   (cdr (remote-hh-dat runremote))     ;; on homehost
           (member cmd api:read-only-queries)) ;; this is a read
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  3")
      (rmt:open-qry-close-locally cmd 0 params))

     ;; on homehost and this is a write, we already have a server, but server has died
     ((and (cdr (remote-hh-dat runremote))         ;; on homehost
           (not (member cmd api:read-only-queries))  ;; this is a write
           (remote-server-url runremote)           ;; have a server
           (not (server:check-if-running *toppath*)))  ;; server has died.
      (set! *runremote* (make-remote))
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  4.1")
      (rmt:send-receive cmd rid params attemptnum: attemptnum))

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

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

     ((and (not (cdr (remote-hh-dat runremote)))        ;; not on a homehost 
           (not (remote-conndat runremote)))            ;; and no connection
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  6  hh-dat: " (remote-hh-dat runremote) " conndat: " (remote-conndat runremote))
      (mutex-unlock! *rmt-mutex*)
      (server:start-and-wait *toppath*)
      (if (common:force-server?)(remote-force-server-set! runremote #t))
      (remote-conndat-set! runremote (rmt:get-connection-info *toppath*)) ;; calls client:setup which calls client:setup-http
      (rmt:send-receive cmd rid params attemptnum: attemptnum)) ;; TODO: add back-off timeout as
     ;; all set up if get this far, dispatch the query
     ((and (not (remote-force-server runremote))
	   (cdr (remote-hh-dat runremote))) ;; we are on homehost
      (mutex-unlock! *rmt-mutex*)
      (debug:print-info 12 *default-log-port* "rmt:send-receive, case  7")
      (rmt:open-qry-close-locally cmd (if rid rid 0) params))

     ;; not on homehost, do server query
     (else
      (mutex-unlock! *rmt-mutex*)

      (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 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)))
      (if (or server-url
	      (> (current-seconds) give-up-time)) ;; server-url will be #f if no server available.
	  server-url