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SHA1: 1d35a8920216354f29b0e488a5832e40d9422414
User & Date: bjbarcla on 2016-11-11 15:46:21
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Context
2016-11-11
17:12
problems with -daemonize check-in: da14d4a8a4 user: bjbarcla tags: rpc-transport
15:46
wip check-in: 1d35a89202 user: bjbarcla tags: rpc-transport
2016-11-04
18:52
changed default transport to rpc check-in: 122f376d3c user: bjbarcla tags: rpc-transport
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Modified client.scm from [01b4fde796] to [93c404c342].

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;;     ((zmq)  (zmq:client-connect  iface port))
;;     (else   (rpc:client-connect  iface port))))

(define (client:setup run-id #!key (remaining-tries 10))
  (debug:print-info 2 *default-log-port* "client:setup remaining-tries=" remaining-tries)
  (let* ((server-dat (tasks:bb-get-server-info run-id))
         (transport (if server-dat (string->symbol (tasks:hostinfo-get-transport server-dat)) 'noserver)))
    ;;(BB> "transport >"transport"<  string? transport >"(string? transport)"< symbol? transport >"(symbol? transport)"<")
    (case transport
      ((noserver) ;; no server registered
       (if (<= remaining-tries 0)
           (begin
             (debug:print-error 0 *default-log-port* "failed to start or connect to server for run-id " run-id)
             (exit 1))
           (begin    








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;;     ((zmq)  (zmq:client-connect  iface port))
;;     (else   (rpc:client-connect  iface port))))

(define (client:setup run-id #!key (remaining-tries 10))
  (debug:print-info 2 *default-log-port* "client:setup remaining-tries=" remaining-tries)
  (let* ((server-dat (tasks:bb-get-server-info run-id))
         (transport (if server-dat (string->symbol (tasks:hostinfo-get-transport server-dat)) 'noserver)))

    (case transport
      ((noserver) ;; no server registered
       (if (<= remaining-tries 0)
           (begin
             (debug:print-error 0 *default-log-port* "failed to start or connect to server for run-id " run-id)
             (exit 1))
           (begin
︙︙

Modified fs-transport.scm from [311c358987] to [de64f5b4d6].

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(use sqlite3 srfi-1 posix regex regex-case srfi-69 hostinfo md5 message-digest)
(import (prefix sqlite3 sqlite3:))

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

;;(tcp-buffer-size 2048)
(BB> "HEY TURNING OFF tcp-buffer-size TO TEST FOR RPC SIDE EFFECT>  TURN BACK ON BEFORE PRODUCTION")

(declare (unit fs-transport))

(declare (uses common))
(declare (uses db))
(declare (uses tests))
(declare (uses tasks)) ;; tasks are where stuff is maintained about what is running.








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(use sqlite3 srfi-1 posix regex regex-case srfi-69 hostinfo md5 message-digest)
(import (prefix sqlite3 sqlite3:))

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

;;(tcp-buffer-size 2048)


(declare (unit fs-transport))

(declare (uses common))
(declare (uses db))
(declare (uses tests))
(declare (uses tasks)) ;; tasks are where stuff is maintained about what is running.
︙︙

Modified launch.scm from [7e23bea701] to [5f9f026431].

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    (if (file-exists? cname)
	(let* ((dat  (read-config cname #f #f))
	       (csvr (db:logpro-dat->csv dat stepname))
	       (csvt (let-values (( (fmt-cell fmt-record fmt-csv) (make-format ",")))
				 (fmt-csv (map list->csv-record csvr))))
	       (status (configf:lookup dat "final" "exit-status"))
	       (msg     (configf:lookup dat "final" "message")))
          ;;(if csvt  ;; this if blocked stack dump caused by .dat file from logpro being 0-byte.  fixed by upgrading logpro
              (rmt:csv->test-data run-id test-id csvt)
            ;;  (BB> "Error: run-id/test-id/stepname="run-id"/"test-id"/"stepname" => bad csvr="csvr)
            ;;  )
	  (cond
	   ((equal? status "PASS") "PASS") ;; skip the message part if status is pass
	   (status (conc (configf:lookup dat "final" "exit-status") ": " (if msg msg "no message")))
	   (else #f)))
	#f)))

(define (launch:runstep ezstep run-id test-id exit-info m tal testconfig)








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    (if (file-exists? cname)
	(let* ((dat  (read-config cname #f #f))
	       (csvr (db:logpro-dat->csv dat stepname))
	       (csvt (let-values (( (fmt-cell fmt-record fmt-csv) (make-format ",")))
				 (fmt-csv (map list->csv-record csvr))))
	       (status (configf:lookup dat "final" "exit-status"))
	       (msg     (configf:lookup dat "final" "message")))

          (rmt:csv->test-data run-id test-id csvt)


	  (cond
	   ((equal? status "PASS") "PASS") ;; skip the message part if status is pass
	   (status (conc (configf:lookup dat "final" "exit-status") ": " (if msg msg "no message")))
	   (else #f)))
	#f)))

(define (launch:runstep ezstep run-id test-id exit-info m tal testconfig)
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	    )))
    (if (and *toppath*
	     (directory-exists? *toppath*))
	(setenv "MT_RUN_AREA_HOME" *toppath*)
	(begin
	  (debug:print-error 0 *default-log-port* "failed to find the top path to your Megatest area.")))
    (server:set-transport)
    ;;(BB> "Transport is >"*transport-type*"<")
    *toppath*))

(define (get-best-disk confdat testconfig)
  (let* ((disks   (or (and testconfig (hash-table-ref/default testconfig "disks" #f))
		      (hash-table-ref/default confdat "disks" #f)))
	 (minspace (let ((m (configf:lookup confdat "setup" "minspace")))
		     (string->number (or m "10000")))))








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	    )))
    (if (and *toppath*
	     (directory-exists? *toppath*))
	(setenv "MT_RUN_AREA_HOME" *toppath*)
	(begin
	  (debug:print-error 0 *default-log-port* "failed to find the top path to your Megatest area.")))
    (server:set-transport)

    *toppath*))

(define (get-best-disk confdat testconfig)
  (let* ((disks   (or (and testconfig (hash-table-ref/default testconfig "disks" #f))
		      (hash-table-ref/default confdat "disks" #f)))
	 (minspace (let ((m (configf:lookup confdat "setup" "minspace")))
		     (string->number (or m "10000")))))
︙︙

Modified rpc-transport.scm from [73278da0e8] to [af5f073564].

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(include "db_records.scm")

(define *heartbeat-mutex* (make-mutex))
(define *server-loop-heart-beat* (current-seconds))


;; procstr is the name of the procedure to be called as a string

(define (rpc-transport:autoremote procstr params)
  (print "BB> rpc-transport:autoremote entered with procstr="procstr" params="params" string?"(string? procstr)" symbol?"(symbol? procstr)" list?"(list? params)   )
  (let* ((procsym (if (symbol? procstr)
                     procstr
                     (string->symbol (->string procstr))))
        (res

         (begin (print "BB>before apply") (apply (eval procsym) params))))
    (print "BB> after apply; rpc-transport res="res)
    res
    ))


;; rpc receiver
(define (rpc-transport:api-exec cmd params)
  (BB> "rpc-transport:api-exec cmd="cmd" params="params" inmemdb="*inmemdb*)
  (let* ( (resdat  (api:execute-requests *inmemdb* (vector cmd params))) ;; #( flag result )
          (flag    (vector-ref resdat 0))
          (res     (vector-ref resdat 1)))
    (BB> "rpc-transport:api-exec flag="flag" res="res)






    res))


  ;; (handle-exceptions
  ;;  exn
  ;;  (begin
  ;;    (debug:print 0 *default-log-port* "Remote failed for " proc " " params " exn="exn)








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(include "db_records.scm")

(define *heartbeat-mutex* (make-mutex))
(define *server-loop-heart-beat* (current-seconds))


;; procstr is the name of the procedure to be called as a string

(define (rpc-transport:autoremote procstr params)  ;; may be unused, I think api-exec deprecates this one.

  (let* ((procsym (if (symbol? procstr)
                     procstr
                     (string->symbol (->string procstr))))
        (res
         (begin
           (apply (eval procsym) params))))

    res))



;; rpc receiver
(define (rpc-transport:api-exec cmd params)

  (let* ( (resdat  (api:execute-requests *inmemdb* (vector cmd params))) ;; #( flag result )
          (flag    (vector-ref resdat 0))
          (res     (vector-ref resdat 1)))

    (mutex-lock! *heartbeat-mutex*)

    (set! *last-db-access* (current-seconds)) ;; bump *last-db-access*; this will renew keep-running thread's lease on life for another (server:get-timeout) seconds
    (BB> "in api-exec; last-db-access updated to "*last-db-access*)
    (mutex-unlock! *heartbeat-mutex*)

    res))


  ;; (handle-exceptions
  ;;  exn
  ;;  (begin
  ;;    (debug:print 0 *default-log-port* "Remote failed for " proc " " params " exn="exn)
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                (abort res-value)); re-raise the exception. TODO: find a way for call-history to show as though from entry to this function
              (begin
                (if chatty (print " + last try failed with exception- return canned failure value >"failure-value"<"))
                failure-value))))))))


(define (rpc-transport:server-shutdown server-id rpc:listener #!key (from-on-exit #f))
  (BB> "rpc-transport:server-shutdown entered.")
  (on-exit (lambda () #t)) ;; turn off on-exit stuff
  ;;(tcp-close rpc:listener) ;; gotta exit nicely
  ;;(tasks:bb-server-set-state! server-id "stopped")


  ;; TODO: (low) the following is extraordinaritly slow.  Maybe we don't even need portlogger for rpc anyway??  the exception-based failover when ports are taken is fast!
  ;;(BB> "before plog rel")
  ;;(portlogger:open-run-close portlogger:set-port (rpc:default-server-port) "released")
  
  (set! *time-to-exit* #t)
  (BB> "before db:sync-touched")
  (if *inmemdb* (db:sync-touched *inmemdb* *run-id* force-sync: #t))
  (BB> "before bb-server-delete-record")
  (tasks:bb-server-delete-record server-id " rpc-transport:keep-running complete")
  (BB> "Before (exit) (from-on-exit="from-on-exit")")
  (unless from-on-exit (exit))  ;; sometimes we hang (around) here with 100% cpu.
  (BB> "After")
  ;; strace reveals endless:
  ;; getrusage(RUSAGE_SELF, {ru_utime={413, 917868}, ru_stime={0, 60003}, ...}) = 0
  ;; getrusage(RUSAGE_SELF, {ru_utime={414, 9874}, ru_stime={0, 60003}, ...}) = 0








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                (abort res-value)); re-raise the exception. TODO: find a way for call-history to show as though from entry to this function
              (begin
                (if chatty (print " + last try failed with exception- return canned failure value >"failure-value"<"))
                failure-value))))))))


(define (rpc-transport:server-shutdown server-id rpc:listener #!key (from-on-exit #f))

  (on-exit (lambda () #t)) ;; turn off on-exit stuff
  ;;(tcp-close rpc:listener) ;; gotta exit nicely
  ;;(tasks:bb-server-set-state! server-id "stopped")


  ;; TODO: (low) the following is extraordinaritly slow.  Maybe we don't even need portlogger for rpc anyway??  the exception-based failover when ports are taken is fast!

  ;;(portlogger:open-run-close portlogger:set-port (rpc:default-server-port) "released")
  
  (set! *time-to-exit* #t)

  (if *inmemdb* (db:sync-touched *inmemdb* *run-id* force-sync: #t))

  (tasks:bb-server-delete-record server-id " rpc-transport:keep-running complete")
  (BB> "Before (exit) (from-on-exit="from-on-exit")")
  (unless from-on-exit (exit))  ;; sometimes we hang (around) here with 100% cpu.
  (BB> "After")
  ;; strace reveals endless:
  ;; getrusage(RUSAGE_SELF, {ru_utime={413, 917868}, ru_stime={0, 60003}, ...}) = 0
  ;; getrusage(RUSAGE_SELF, {ru_utime={414, 9874}, ru_stime={0, 60003}, ...}) = 0
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;; all routes though here end in exit ...
;;
;; start_server? 
;;
(define (rpc-transport:launch run-id)
  (BB> "rpc-transport:launch fired for run-id="run-id)
  (set! *run-id*   run-id)

  ;; send to background if requested
  (when (args:get-arg "-daemonize")
      (daemon:ize)
      (when *alt-log-file* ;; we should re-connect to this port, I think daemon:ize disrupts it
        (current-error-port *alt-log-file*)
        (current-output-port *alt-log-file*)))

  ;; double check we dont alrady have a running server for this run-id
  (when (server:check-if-running run-id)
    (debug:print 0 *default-log-port* "INFO: Server for run-id " run-id " already running")
    (exit 0))

  ;; let's get a server-id for this server
  ;;   if at first we do not suceed, try 3 more times.
  (let ((server-id (retry-thunk
                    (lambda () (tasks:bb-server-lock-slot run-id 'rpc))
                    chatty: #t
                    retries: 4)))
    (when (not server-id) ;; dang we couldn't get a server-id.
      ;; since we didn't get the server lock we are going to clean up and bail out
      (debug:print-info 2 *default-log-port* "INFO: server pid=" (current-process-id) ", hostname=" (get-host-name) " not starting due to other candidates ahead in start queue")
      (tasks:bb-server-delete-records-for-this-pid " rpc-transport:launch")
      (exit 1))









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;; all routes though here end in exit ...
;;
;; start_server? 
;;
(define (rpc-transport:launch run-id)

  (set! *run-id*   run-id)

  ;; send to background if requested
  (when (args:get-arg "-daemonize")
      (daemon:ize)
      (when *alt-log-file* ;; we should re-connect to this port, I think daemon:ize disrupts it
        (current-error-port *alt-log-file*)
        (current-output-port *alt-log-file*)))

  ;; double check we dont alrady have a running server for this run-id
  (when (server:check-if-running run-id)
    (debug:print 0 *default-log-port* "INFO: Server for run-id " run-id " already running")
    (exit 0))

  ;; let's get a server-id for this server
  ;;   if at first we do not suceed, try 3 more times.
  (let ((server-id (retry-thunk
                    (lambda () (tasks:bb-server-lock-slot run-id 'rpc))
                    chatty: #f
                    retries: 4)))
    (when (not server-id) ;; dang we couldn't get a server-id.
      ;; since we didn't get the server lock we are going to clean up and bail out
      (debug:print-info 2 *default-log-port* "INFO: server pid=" (current-process-id) ", hostname=" (get-host-name) " not starting due to other candidates ahead in start queue")
      (tasks:bb-server-delete-records-for-this-pid " rpc-transport:launch")
      (exit 1))
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  (let* ((iface (rpc-transport:server-dat-get-iface serverdat))
         (port  (rpc-transport:server-dat-get-port serverdat))
         (res #f)
         (run-remote (rpc:procedure 'rpc-transport:autoremote iface port))
         (api-exec (rpc:procedure 'api-exec iface port))
         (send-receive (lambda ()
                         (tcp-buffer-size 0)
                         (BB> "Entered SR run-id="run-id" cmd="cmd" params="params" iface="iface" port="port)
                         (set! res (retry-thunk
                                    (lambda ()
                                      (condition-case
                                       ;;(vector #t (run-remote cmd params))
                                       (vector 'success (api-exec cmd params))
                                       [x (exn i/o net) (vector 'comms-fail (conc "communications fail ["(->string x)"]") x)]
                                       [x () (vector 'other-fail "other fail ["(->string x)"]" x)]))
                                    chatty: #t
                                    accept-result?: (lambda(x)
                                                      (and (vector? x) (vector-ref x 0)))
                                    retries: 4
                                    back-off-factor: 1.5
                                    random-wait: 0.2
                                    retry-delay: 0.1
                                    final-failure-returns-actual: #t))
                         (BB> "Leaving SR w/ "res)
                         res
                         ))
         (th1 (make-thread send-receive "send-receive"))
         (time-out-reached #f)
         (time-out     (lambda ()
			      (thread-sleep! 45)
                              (set! time-out-reached #t)








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  (let* ((iface (rpc-transport:server-dat-get-iface serverdat))
         (port  (rpc-transport:server-dat-get-port serverdat))
         (res #f)
         (run-remote (rpc:procedure 'rpc-transport:autoremote iface port))
         (api-exec (rpc:procedure 'api-exec iface port))
         (send-receive (lambda ()
                         (tcp-buffer-size 0)

                         (set! res (retry-thunk
                                    (lambda ()
                                      (condition-case
                                       ;;(vector #t (run-remote cmd params))
                                       (vector 'success (api-exec cmd params))
                                       [x (exn i/o net) (vector 'comms-fail (conc "communications fail ["(->string x)"]") x)]
                                       [x () (vector 'other-fail "other fail ["(->string x)"]" x)]))
                                    chatty: #f
                                    accept-result?: (lambda(x)
                                                      (and (vector? x) (vector-ref x 0)))
                                    retries: 4
                                    back-off-factor: 1.5
                                    random-wait: 0.2
                                    retry-delay: 0.1
                                    final-failure-returns-actual: #t))

                         res
                         ))
         (th1 (make-thread send-receive "send-receive"))
         (time-out-reached #f)
         (time-out     (lambda ()
			      (thread-sleep! 45)
                              (set! time-out-reached #t)
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             (case (vector-ref res 0)
               ((success) (vector #t (vector-ref res 1)))
               ((comms-fail)
                (debug:print 0 *default-log-port* "WARNING: comms failure for rpc request")
                ;;(debug:print 0 *default-log-port* " message: " ((condition-property-accessor 'exn 'message) exn))
                (vector #f (vector-ref res 1)))
               (else
                (BB> "res="res)
                (debug:print-error 0 *default-log-port* "error occured at server, info=" (vector-ref res 1))
                (debug:print 0 *default-log-port* " client call chain:")
                (print-call-chain (current-error-port))
                (debug:print 0 *default-log-port* " server call chain:")
                (pp (vector-ref res 1) (current-error-port))
                (signal (vector-ref res 2))))
             (signal (make-composite-condition
                      (make-property-condition 
             	       'timeout
             	       'message "nmsg-transport:client-api-send-receive-raw timed out talking to server"))))))
        


(define (rpc-transport:run hostn run-id server-id)
  (BB> "rpc-transport:run fired for hostn="hostn" run-id="run-id" server-id="server-id)
  (debug:print 2 *default-log-port* "Attempting to start the rpc server ...")
   ;; (trace rpc:publish-procedure!)

  ;;======================================================================
  ;;	  start of publish-procedure section
  ;;======================================================================
  (rpc:publish-procedure! 'server:login server:login) ;; this allows client to validate it is the same megatest instance as the server.  No security here, just making sure we're in the right room.
  (BB> "published 'testing")
  (rpc:publish-procedure!
   'testing
   (lambda ()
     (BB> "Current-peer=["(rpc:current-peer)"]")
     (BB> "published rpc proc 'testing was invoked")
     "Just testing"))

  ;; procedure to receive arbitrary API request from client's rpc:send-receive/rpc-transport:client-api-send-receive 
  (rpc:publish-procedure! 'rpc-transport:autoremote rpc-transport:autoremote)
  ;; can use this to run most anything at the remote
  (rpc:publish-procedure! 'api-exec rpc-transport:api-exec)
  
  
  ;;======================================================================
  ;;	  end of publish-procedure section
  ;;======================================================================


  (let* ((db              #f)
	 (hostname        (let ((res (get-host-name))) (BB> "hostname="res) res))
         (server-start-time (current-seconds))
         (server-timeout (server:get-timeout))
	 (ipaddrstr       (let* ((ipstr (if (string=? "-" hostn)
					   ;; (string-intersperse (map number->string (u8vector->list (hostname->ip hostname))) ".")
					   (server:get-best-guess-address hostname)
					   #f))
                                 (res (if ipstr ipstr hostn)))
                            (BB> "ipaddrstr="res)                             
                            res)) ;; hostname))) 
	 (start-port      (let ((res (portlogger:open-run-close portlogger:find-port))) (BB> "start-port="res) res))

	 (link-tree-path  (configf:lookup *configdat* "setup" "linktree"))

         ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
         ;; rpc:listener is the tcp-listen result from inside the find-free-port-and-open complex.
         ;;   It is our handle on the listening tcp port
         ;;   We will attach this to our rpc server with rpc:make-server in thread th1 .
	 (rpc:listener    (rpc-transport:find-free-port-and-open start-port)) 
	 (th1             (make-thread
			   (lambda ()
                             (BB> "+++ before rpc:make-server "rpc:listener)
                             ;;(cute (rpc:make-server rpc:listener) "rpc:server")
			     ((rpc:make-server rpc:listener) #t)
                             (BB> "--- after rpc:make-server"))
			   "rpc:server"))


         (hostname        (if (string=? "-" hostn)
			      (get-host-name) 
			      hostn))
	 (ipaddrstr       (if (string=? "-" hostn)
			      (server:get-best-guess-address hostname) ;; (string-intersperse (map number->string (u8vector->list (hostname->ip hostname))) ".")
			      #f))
	 (portnum         (let ((res (rpc:default-server-port))) (BB> "rpc:default-server-port="res" rpc-listener-port="*rpc-listener-port*) res))
	 (host:port       (conc (if ipaddrstr ipaddrstr hostname) ":" portnum)))



    ;; if rpc found it needed a different port than portlogger provided, keep portlogger in the loop.
    ;; (when (not (equal? start-port portnum))
    ;;   (BB> "portlogger proffered "start-port" but rpc grabbed "portnum)
    ;;   (portlogger:open-run-close portlogger:set-port start-port "released")
    ;;   (portlogger:open-run-close portlogger:take-port portnum))

    (tasks:bb-server-set-interface-port server-id ipaddrstr portnum)

    ;;============================================================
    ;;  activate thread th1 to attach opened tcp port to rpc server
    ;;=============================================================
    (BB> "Got here before thread start of rpc listener")
    (thread-start! th1)
    (BB> "started rpc server thread th1="th1)

    (set! db *inmemdb*)

    (debug:print 0 *default-log-port* "Server started on " host:port)
    

    (thread-sleep! 8)
    (BB> "before self test")
    (if (rpc-transport:self-test run-id ipaddrstr portnum)
        (BB> "Pass self-test.")

        (begin
          (print "Error: rpc listener did not pass self test.  Shutting down.")
          (exit)))
    (BB> "after self test")

    
    (on-exit (lambda ()
               (rpc-transport:server-shutdown server-id rpc:listener from-on-exit: #t)))
    
    ;; check again for running servers for this run-id in case one has snuck in since we checked last in rpc-transport:launch
    (if (not (equal? server-id (tasks:bb-server-am-i-the-server? run-id)));; try to ensure no double registering of servers
        (begin ;; i am not the server, another server snuck in and beat this one to the punch








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             (case (vector-ref res 0)
               ((success) (vector #t (vector-ref res 1)))
               ((comms-fail)
                (debug:print 0 *default-log-port* "WARNING: comms failure for rpc request")
                ;;(debug:print 0 *default-log-port* " message: " ((condition-property-accessor 'exn 'message) exn))
                (vector #f (vector-ref res 1)))
               (else

                (debug:print-error 0 *default-log-port* "error occured at server, info=" (vector-ref res 1))
                (debug:print 0 *default-log-port* " client call chain:")
                (print-call-chain (current-error-port))
                (debug:print 0 *default-log-port* " server call chain:")
                (pp (vector-ref res 1) (current-error-port))
                (signal (vector-ref res 2))))
             (signal (make-composite-condition
                      (make-property-condition 
             	       'timeout
             	       'message "nmsg-transport:client-api-send-receive-raw timed out talking to server"))))))
        


(define (rpc-transport:run hostn run-id server-id)

  (debug:print 2 *default-log-port* "Attempting to start the rpc server ...")
   ;; (trace rpc:publish-procedure!)

  ;;======================================================================
  ;;	  start of publish-procedure section
  ;;======================================================================
  (rpc:publish-procedure! 'server:login server:login) ;; this allows client to validate it is the same megatest instance as the server.  No security here, just making sure we're in the right room.

  (rpc:publish-procedure!
   'testing
   (lambda ()


     "Just testing"))

  ;; procedure to receive arbitrary API request from client's rpc:send-receive/rpc-transport:client-api-send-receive 
  (rpc:publish-procedure! 'rpc-transport:autoremote rpc-transport:autoremote)
  ;; can use this to run most anything at the remote
  (rpc:publish-procedure! 'api-exec rpc-transport:api-exec)
  
  
  ;;======================================================================
  ;;	  end of publish-procedure section
  ;;======================================================================


  (let* ((db              #f)
	 (hostname        (let ((res (get-host-name)))  res))
         (server-start-time (current-seconds))
         (server-timeout (server:get-timeout))
	 (ipaddrstr       (let* ((ipstr (if (string=? "-" hostn)
					   ;; (string-intersperse (map number->string (u8vector->list (hostname->ip hostname))) ".")
					   (server:get-best-guess-address hostname)
					   #f))
                                 (res (if ipstr ipstr hostn)))

                            res)) ;; hostname))) 
	 (start-port      (let ((res (portlogger:open-run-close portlogger:find-port)))      ;; BB> TODO: remove portlogger!
                            res))
	 (link-tree-path  (configf:lookup *configdat* "setup" "linktree"))

         ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
         ;; rpc:listener is the tcp-listen result from inside the find-free-port-and-open complex.
         ;;   It is our handle on the listening tcp port
         ;;   We will attach this to our rpc server with rpc:make-server in thread th1 .
	 (rpc:listener    (rpc-transport:find-free-port-and-open start-port)) 
	 (th1             (make-thread
			   (lambda ()


			     ((rpc:make-server rpc:listener) #t) )

			   "rpc:server"))


         (hostname        (if (string=? "-" hostn)
			      (get-host-name) 
			      hostn))
	 (ipaddrstr       (if (string=? "-" hostn)
			      (server:get-best-guess-address hostname) ;; (string-intersperse (map number->string (u8vector->list (hostname->ip hostname))) ".")
			      #f))
	 (portnum         (let ((res (rpc:default-server-port)))  res))
	 (host:port       (conc (if ipaddrstr ipaddrstr hostname) ":" portnum)))


    ;; BB> TODO: remove portlogger!
    ;; if rpc found it needed a different port than portlogger provided, keep portlogger in the loop.
    ;; (when (not (equal? start-port portnum))
    ;;   (BB> "portlogger proffered "start-port" but rpc grabbed "portnum)
    ;;   (portlogger:open-run-close portlogger:set-port start-port "released")
    ;;   (portlogger:open-run-close portlogger:take-port portnum))

    (tasks:bb-server-set-interface-port server-id ipaddrstr portnum)

    ;;============================================================
    ;;  activate thread th1 to attach opened tcp port to rpc server
    ;;=============================================================

    (thread-start! th1)


    (set! db *inmemdb*)

    (debug:print 0 *default-log-port* "Server started on " host:port)
    

    (thread-sleep! 2)

    (if (rpc-transport:self-test run-id ipaddrstr portnum)

        (debug:print 0 *default-log-port* "INFO: rpc self test passed!")
        (begin
          (debug:print 0 *default-log-port* "Error: rpc listener did not pass self test.  Shutting down.  On: " host:port)
          (exit)))


    
    (on-exit (lambda ()
               (rpc-transport:server-shutdown server-id rpc:listener from-on-exit: #t)))
    
    ;; check again for running servers for this run-id in case one has snuck in since we checked last in rpc-transport:launch
    (if (not (equal? server-id (tasks:bb-server-am-i-the-server? run-id)));; try to ensure no double registering of servers
        (begin ;; i am not the server, another server snuck in and beat this one to the punch
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          ;; this let loop will hold open this thread until we want the server to shut down.
          ;;   if no requests received within the last 20 seconds :
          ;;   database hasnt changed in ??
          ;;

          ;; begin new loop

          (let loop ((count          0)
                     (bad-sync-count 0))

            ;; Use this opportunity to sync the inmemdb to db
            (let ((start-time (current-milliseconds))
                  (sync-time  #f)
                  (rem-time   #f))








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          ;; this let loop will hold open this thread until we want the server to shut down.
          ;;   if no requests received within the last 20 seconds :
          ;;   database hasnt changed in ??
          ;;

          ;; begin new loop
          ;; keep-running loop: polls last-db-access to see if we have timed out.  
          (let loop ((count          0)
                     (bad-sync-count 0))

            ;; Use this opportunity to sync the inmemdb to db
            (let ((start-time (current-milliseconds))
                  (sync-time  #f)
                  (rem-time   #f))
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            ;;       (debug:print-info 0 *default-log-port* "interface changed, refreshing iface and port info")
            ;;       (set! iface (car sdat))
            ;;       (set! port  (cadr sdat))))
            
            ;; Transfer *last-db-access* to last-access to use in checking that we are still alive
            (mutex-lock! *heartbeat-mutex*)
            (set! last-access *last-db-access*)

            (mutex-unlock! *heartbeat-mutex*)
            
            ;; (debug:print 11 *default-log-port* "last-access=" last-access ", server-timeout=" server-timeout)
            ;;
            ;; no_traffic, no running tests, if server 0, no running servers
            ;;
            ;; (let ((wait-on-running (configf:lookup *configdat* "server" b"wait-on-running"))) ;; wait on running tasks (if not true then exit on time out)








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            ;;       (debug:print-info 0 *default-log-port* "interface changed, refreshing iface and port info")
            ;;       (set! iface (car sdat))
            ;;       (set! port  (cadr sdat))))
            
            ;; Transfer *last-db-access* to last-access to use in checking that we are still alive
            (mutex-lock! *heartbeat-mutex*)
            (set! last-access *last-db-access*)
            (BB> "in rpc-transport:run ; last-access="last-access)
            (mutex-unlock! *heartbeat-mutex*)
            
            ;; (debug:print 11 *default-log-port* "last-access=" last-access ", server-timeout=" server-timeout)
            ;;
            ;; no_traffic, no running tests, if server 0, no running servers
            ;;
            ;; (let ((wait-on-running (configf:lookup *configdat* "server" b"wait-on-running"))) ;; wait on running tasks (if not true then exit on time out)
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                    ;; Consider implementing some smarts here to re-insert the record or kill self is
                    ;; the db indicates so
                    ;;
                    ;; (if (tasks:server-am-i-the-server? tdb run-id)
                    ;;     (tasks:server-set-state! tdb server-id "running"))
                    ;;
                    (loop 0 bad-sync-count))


                  (rpc-transport:server-shutdown server-id rpc:listener))))
          ;; end new loop
          
          ;; ;; begin old loop
          ;; (let loop ((count 0))
          ;;   (BB> "Found top of rpc-transport:run stay-alive loop.")
          ;;   (thread-sleep! 5) ;; no need to do this very often
          ;;   (let ((numrunning -1)) ;; (db:get-count-tests-running db)))
          ;;     (if (or (> numrunning 0)
          ;;             (> (+ *last-db-access* 60)(current-seconds)))
          ;;         (begin
          ;;           (debug:print-info 0 *default-log-port* "Server continuing, tests running: " numrunning ", seconds since last db access: " (- (current-seconds) *last-db-access*))
          ;;           (loop (+ 1 count)))
          ;;         (begin
          ;;           (debug:print-info 0 *default-log-port* "Starting to shutdown the server side")
          ;;           (open-run-close tasks:server-delete-record tasks:open-db server-id " rpc-transport:try-start-server stop")
          ;;           (thread-sleep! 10)
          ;;           (debug:print-info 0 *default-log-port* "Max cached queries was " *max-cache-size*)
          ;;           (debug:print-info 0 *default-log-port* "Server shutdown complete. Exiting")
          ;;           ))))
          ;; ;; end old loop


          ))))


(define (rpc-transport:find-free-port-and-open port #!key )
  (handle-exceptions
   exn
   (begin
     (print "Failed to bind to port " (rpc:default-server-port) ", trying next port")
     (rpc-transport:find-free-port-and-open (add1 port)))
   (rpc:default-server-port port)
   (set! *rpc-listener-port* port) ;; a bit paranoid about rpc:default-server-port parameter not changing across threads (as params are wont to do).  keeping this global in my back pocket in case this causes problems
   (set! *rpc-listener-port-bind-timestamp* (current-milliseconds)) ;; may want to test how long it has been since the last bind attempt happened...
   (tcp-read-timeout 240000)
   (tcp-buffer-size 0) ;; gotta do this because http-transport undoes it.
   (BB> "rpc-transport> attempting to bind tcp port "port)
   (tcp-listen (rpc:default-server-port) 10000)
   ;;(tcp-listen (rpc:default-server-port) )
   ))
  
(define (rpc-transport:ping run-id host port)
  (handle-exceptions
   exn
   (begin
     (print "SERVER_NOT_FOUND")
     (exit 1))
   (let ((login-res ((rpc:procedure 'server:login host port) *toppath*)))
     (if login-res
	 (begin
	   (print "LOGIN_OK")
	   (exit 0))
	 (begin
	   (print "LOGIN_FAILED")
	   (exit 1))))))

(define (rpc-transport:self-test run-id host port)
  (BB> "SELF TEST RPC ... *toppath*="*toppath*)
  (BB> "local: [" (server:login *toppath*) "]")
  ;(handle-exceptions
   ;exn
   ;(begin
   ;  (BB> "SERVER_NOT_FOUND")
   ;  #f)
  (tcp-buffer-size 0) ;; gotta do this because http-transport undoes it.
  (let* ((testing-res ((rpc:procedure 'testing host port)))
         (login-res ((rpc:procedure 'server:login host port) *toppath*))
         (res (and login-res (equal? testing-res "Just testing"))))

     (BB> "testing-res = >"testing-res"<")
     (BB> "login-res = >"testing-res"<")
     (if login-res
	 (begin
	   (BB> "LOGIN_OK")
	   #t)
	 (begin

	   (BB> "LOGIN_FAILED")
	   #f))
     (BB> "self test res="res)
     res));)

(define (rpc-transport:client-setup run-id server-dat #!key (remtries 10))
  (tcp-buffer-size 0)
  (debug:print-info 0 *default-log-port* "rpc-transport:client-setup run-id="run-id" server-dat=" server-dat ", remaining-tries=" remtries)
  (let* ((iface     (tasks:hostinfo-get-interface server-dat))
         (hostname  (tasks:hostinfo-get-hostname  server-dat))
         (port      (tasks:hostinfo-get-port      server-dat))








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                    ;; Consider implementing some smarts here to re-insert the record or kill self is
                    ;; the db indicates so
                    ;;
                    ;; (if (tasks:server-am-i-the-server? tdb run-id)
                    ;;     (tasks:server-set-state! tdb server-id "running"))
                    ;;
                    (loop 0 bad-sync-count))
                  (begin
                    (BB> "SERVER SHUTDOWN CALLED!  last-access="last-access" current-seconds="(current-seconds)" server-timeout="server-timeout)
                    (rpc-transport:server-shutdown server-id rpc:listener)))))
          ;; end new loop





















          ))))


(define (rpc-transport:find-free-port-and-open port #!key )
  (handle-exceptions
   exn
   (begin
     (print "Failed to bind to port " (rpc:default-server-port) ", trying next port")
     (rpc-transport:find-free-port-and-open (add1 port)))
   (rpc:default-server-port port)
   (set! *rpc-listener-port* port) ;; a bit paranoid about rpc:default-server-port parameter not changing across threads (as params are wont to do).  keeping this global in my back pocket in case this causes problems
   (set! *rpc-listener-port-bind-timestamp* (current-milliseconds)) ;; may want to test how long it has been since the last bind attempt happened...
   (tcp-read-timeout 240000)
   (tcp-buffer-size 0) ;; gotta do this because http-transport undoes it.

   (tcp-listen (rpc:default-server-port) 10000)

   ))
  
(define (rpc-transport:ping run-id host port)
  (handle-exceptions
   exn
   (begin
     (print "SERVER_NOT_FOUND")
     (exit 1))
   (let ((login-res ((rpc:procedure 'server:login host port) *toppath*)))
     (if login-res
	 (begin
	   (print "LOGIN_OK")
	   (exit 0))
	 (begin
	   (print "LOGIN_FAILED")
	   (exit 1))))))

(define (rpc-transport:self-test run-id host port)







  (tcp-buffer-size 0) ;; gotta do this because http-transport undoes it.
  (let* ((testing-res ((rpc:procedure 'testing host port)))
         (login-res ((rpc:procedure 'server:login host port) *toppath*))
         (res (and login-res (equal? testing-res "Just testing"))))
    


    (if login-res
        (begin
          (BB> "Self test PASS.  login-res="login-res" testing-res="testing-res" *toppath*="*toppath*)
          #t)
        (begin
          (BB> "Self test fail.  login-res="login-res" testing-res="testing-res" *toppath*="*toppath*)
           
          #f))

    res))

(define (rpc-transport:client-setup run-id server-dat #!key (remtries 10))
  (tcp-buffer-size 0)
  (debug:print-info 0 *default-log-port* "rpc-transport:client-setup run-id="run-id" server-dat=" server-dat ", remaining-tries=" remtries)
  (let* ((iface     (tasks:hostinfo-get-interface server-dat))
         (hostname  (tasks:hostinfo-get-hostname  server-dat))
         (port      (tasks:hostinfo-get-port      server-dat))
︙︙

Modified server.scm from [bc89cb6e04] to [975fdc3c54].

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;;

;; all routes though here end in exit ...
;;
;; start_server
;;
(define (server:launch run-id transport-type)
  (BB> "server:launch fired for run-id="run-id" transport-type="transport-type)
  (let ((ttype (if (symbol? transport-type) transport-type (string->symbol (->string transport-type)))))
    (case ttype
      ((http)(http-transport:launch run-id))
      ;;((nmsg)(nmsg-transport:launch run-id))
      ((rpc)  (rpc-transport:launch run-id))
      (else (debug:print-error 0 *default-log-port* "unknown server type " ttype)))))
  ;;       (else   (debug:print-error 0 *default-log-port* "No known transport set, transport=" transport ", using rpc")
  ;; 	      (rpc-transport:launch run-id)))))

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

;; set global *transport-type* based on -transport switch and serer/transport configuration.  default http otherwise.
;; called by launch:setup
(define (server:set-transport)
  (let ((ttype (string->symbol
                (or (args:get-arg "-transport")
                    (configf:lookup *configdat* "server" "transport")
                    "rpc"))))
    (BB> "TRANSPORT IS "ttype" string?"(string? ttype)" symbol?"(symbol? ttype))
    (set! *transport-type* ttype)
    ttype))

;; Get the transport  -- DO NOT call this from client code.  In client code, this is run-id sensitive and not a global
;;   For code communicating with existing run-id with a server, use: (rmt:run-id->transport-type run-id)
 (define (server:get-transport)
   (if *transport-type*








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;;

;; all routes though here end in exit ...
;;
;; start_server
;;
(define (server:launch run-id transport-type)

  (let ((ttype (if (symbol? transport-type) transport-type (string->symbol (->string transport-type)))))
    (case ttype
      ((http)(http-transport:launch run-id))
      ;;((nmsg)(nmsg-transport:launch run-id))
      ((rpc)  (rpc-transport:launch run-id))
      (else (debug:print-error 0 *default-log-port* "unknown server type " ttype)))))
  ;;       (else   (debug:print-error 0 *default-log-port* "No known transport set, transport=" transport ", using rpc")
  ;; 	      (rpc-transport:launch run-id)))))

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

;; set global *transport-type* based on -transport switch and serer/transport configuration.  default http otherwise.
;; called by launch:setup
(define (server:set-transport)
  (let ((ttype (string->symbol
                (or (args:get-arg "-transport")
                    (configf:lookup *configdat* "server" "transport")
                    "rpc"))))

    (set! *transport-type* ttype)
    ttype))

;; Get the transport  -- DO NOT call this from client code.  In client code, this is run-id sensitive and not a global
;;   For code communicating with existing run-id with a server, use: (rmt:run-id->transport-type run-id)
 (define (server:get-transport)
   (if *transport-type*
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	;; client:start returns #t if login was successful.
	;;
	(let* ((transport-type (rmt:run-id->transport-type run-id))
               (res (case transport-type
		     ((http)(server:ping-server run-id 
						(tasks:hostinfo-get-interface server)
						(tasks:hostinfo-get-port      server)))


                     (else  
                      (debug:print-error 0 *default-log-port* "(5) Transport [" transport-type
                                         "] specified for run-id [" run-id
                                         "] is not implemented in rmt:send-receive.  Cannot proceed.")
                      (exit 1)))))
	  ;; if the server didn't respond we must remove the record
	  (if res








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	;; client:start returns #t if login was successful.
	;;
	(let* ((transport-type (rmt:run-id->transport-type run-id))
               (res (case transport-type
		     ((http)(server:ping-server run-id 
						(tasks:hostinfo-get-interface server)
						(tasks:hostinfo-get-port      server)))
                     ((rpc) ((rpc:procedure 'server:login (tasks:hostinfo-get-interface server) (tasks:hostinfo-get-port      server)) *toppath*))
                     
                     (else  
                      (debug:print-error 0 *default-log-port* "(5) Transport [" transport-type
                                         "] specified for run-id [" run-id
                                         "] is not implemented in rmt:send-receive.  Cannot proceed.")
                      (exit 1)))))
	  ;; if the server didn't respond we must remove the record
	  (if res
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	   (loop (read-line) inl))))))


;; Client will call this procedure on the server via the low-level transport (http/rpc/etc) to verify its toppath matches the server's toppath.
;; A true result means client and server are associated with same megatest instance, share the same megatest.config, etc...)  A false result means the client should not talk to this server.
(define (server:login toppath)
  (set! *last-db-access* (current-seconds))
  (BB> "server:login ours="*toppath*" theirs="toppath)
  (if (equal? *toppath* toppath)
      (begin
        ;; (debug:print-info 2 *default-log-port* "login successful")
        #t)
      (begin
        ;; (debug:print-info 2 *default-log-port* "login failed")
        #f)))








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	   (loop (read-line) inl))))))


;; Client will call this procedure on the server via the low-level transport (http/rpc/etc) to verify its toppath matches the server's toppath.
;; A true result means client and server are associated with same megatest instance, share the same megatest.config, etc...)  A false result means the client should not talk to this server.
(define (server:login toppath)
  (set! *last-db-access* (current-seconds))

  (if (equal? *toppath* toppath)
      (begin
        ;; (debug:print-info 2 *default-log-port* "login successful")
        #t)
      (begin
        ;; (debug:print-info 2 *default-log-port* "login failed")
        #f)))
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