Megatest

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Overview
Comment:fixed bug where client stopped working when server needed restart (cached rpc stub was not refreshing when port changed)
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SHA1: cf3341f20435119561aed393b90fd6252d5a4484
User & Date: bjbarcla on 2016-11-15 18:14:41
Other Links: branch diff | manifest | tags
Context
2016-11-16
16:08
Merged v1.62 into rpc-transport Closed-Leaf check-in: 534875ccf1 user: mrwellan tags: rpc-transport-merge-v1.62
14:45
deadlock msg check-in: a66741d98b user: bjbarcla tags: rpc-transport
2016-11-15
18:14
fixed bug where client stopped working when server needed restart (cached rpc stub was not refreshing when port changed) check-in: cf3341f204 user: bjbarcla tags: rpc-transport
16:37
sync point check-in: 1cf31de4df user: bjbarcla tags: rpc-transport
Changes
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Modified megatest.scm from [56597888dd] to [debfa33c05].

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(if (or (args:get-arg "-list-servers")
	(args:get-arg "-stop-server")
        (args:get-arg "-kill-server"))
    (let ((tl (launch:setup)))
      (if tl 
	  (let* ((tdbdat  (tasks:open-db))
		 (servers (tasks:get-all-servers (db:delay-if-busy tdbdat)))
		 (fmtstr  "~5a~12a~8a~20a~24a~10a~10a~10a~10a\n")
		 (servers-to-kill '())
                 (kill-switch  (if (args:get-arg "-kill-server") "-9" ""))
                 (killinfo   (or (args:get-arg "-stop-server") (args:get-arg "-kill-server") ))
		 (khost-port (if killinfo (if (substring-index ":" killinfo)(string-split ":") #f) #f))
		 (sid        (if killinfo (if (substring-index ":" killinfo) #f (string->number killinfo)) #f)))
	    (format #t fmtstr "Id" "MTver" "Pid" "Host" "Interface:OutPort" "InPort" "LastBeat" "State" "Transport")
	    (format #t fmtstr "==" "=====" "===" "====" "=================" "======" "========" "=====" "=========")
	    (for-each 
	     (lambda (server)
	       (let* ((id         (vector-ref server 0))
		      (pid        (vector-ref server 1))
		      (hostname   (vector-ref server 2))
		      (interface  (vector-ref server 3)) 
		      (pullport   (vector-ref server 4))
		      (pubport    (vector-ref server 5))
		      (start-time (vector-ref server 6))
		      (priority   (vector-ref server 7))
		      (state      (vector-ref server 8))
		      (mt-ver     (vector-ref server 9))
		      (last-update (vector-ref server 10)) 
		      (transport  (vector-ref server 11))

		      (killed     #f)
		      (status     (< last-update 20)))
		 ;;   (zmq-sockets (if status (server:client-connect hostname port) #f)))
		 ;; no need to login as status of #t indicates we are connecting to correct 
		 ;; server
		 (if (equal? state "dead")
		     (if (> last-update (* 25 60 60)) ;; keep records around for slighly over a day.
			 (tasks:server-deregister (db:delay-if-busy tdbdat) hostname pullport: pullport pid: pid action: 'delete))
		     (if (> last-update 20)        ;; Mark as dead if not updated in last 20 seconds
			 (tasks:server-deregister (db:delay-if-busy tdbdat) hostname pullport: pullport pid: pid)))
		 (format #t fmtstr id mt-ver pid hostname (conc interface ":" pullport) pubport last-update
			 (if status "alive" "dead") transport)
		 (if (or (equal? id sid)
			 (equal? sid 0)) ;; kill all/any
		     (begin
		       (debug:print-info 0 *default-log-port* "Attempting to kill "kill-switch" server with pid " pid)
		       (tasks:kill-server hostname pid kill-switch: kill-switch)))))
	     servers)
	    (debug:print-info 1 *default-log-port* "Done with listservers")








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(if (or (args:get-arg "-list-servers")
	(args:get-arg "-stop-server")
        (args:get-arg "-kill-server"))
    (let ((tl (launch:setup)))
      (if tl 
	  (let* ((tdbdat  (tasks:open-db))
		 (servers (tasks:get-all-servers (db:delay-if-busy tdbdat)))
		 (fmtstr  "~5a~6a~12a~8a~20a~24a~10a~10a~10a~10a\n")
		 (servers-to-kill '())
                 (kill-switch  (if (args:get-arg "-kill-server") "-9" ""))
                 (killinfo   (or (args:get-arg "-stop-server") (args:get-arg "-kill-server") ))
		 (khost-port (if killinfo (if (substring-index ":" killinfo)(string-split ":") #f) #f))
		 (sid        (if killinfo (if (substring-index ":" killinfo) #f (string->number killinfo)) #f)))
	    (format #t fmtstr "Id" "RunId" "MTver" "Pid" "Host" "Interface:OutPort" "InPort" "LastBeat" "State" "Transport")
	    (format #t fmtstr "==" "=====" "=====" "===" "====" "=================" "======" "========" "=====" "=========")
	    (for-each 
	     (lambda (server)
	       (let* ((id         (vector-ref server 0))
		      (pid        (vector-ref server 1))
		      (hostname   (vector-ref server 2))
		      (interface  (vector-ref server 3)) 
		      (pullport   (vector-ref server 4))
		      (pubport    (vector-ref server 5))
		      (start-time (vector-ref server 6))
		      (priority   (vector-ref server 7))
		      (state      (vector-ref server 8))
		      (mt-ver     (vector-ref server 9))
		      (last-update (vector-ref server 10)) 
		      (transport  (vector-ref server 11))
                      (run-id  (vector-ref server 12))
		      (killed     #f)
		      (status     (< last-update 20)))
		 ;;   (zmq-sockets (if status (server:client-connect hostname port) #f)))
		 ;; no need to login as status of #t indicates we are connecting to correct 
		 ;; server
		 (if (equal? state "dead")
		     (if (> last-update (* 25 60 60)) ;; keep records around for slighly over a day.
			 (tasks:server-deregister (db:delay-if-busy tdbdat) hostname pullport: pullport pid: pid action: 'delete))
		     (if (> last-update 20)        ;; Mark as dead if not updated in last 20 seconds
			 (tasks:server-deregister (db:delay-if-busy tdbdat) hostname pullport: pullport pid: pid)))
		 (format #t fmtstr id run-id mt-ver pid hostname (conc interface ":" pullport) pubport last-update
			 (if status state "dead") transport)
		 (if (or (equal? id sid)
			 (equal? sid 0)) ;; kill all/any
		     (begin
		       (debug:print-info 0 *default-log-port* "Attempting to kill "kill-switch" server with pid " pid)
		       (tasks:kill-server hostname pid kill-switch: kill-switch)))))
	     servers)
	    (debug:print-info 1 *default-log-port* "Done with listservers")
︙︙

Modified rmt.scm from [eac4b98e46] to [d69ae51ab1].

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;; RA => e.g. usage (rmt:send-receive 'get-var #f (list varname))
;;

(define *rmt:srmutex* (make-mutex))

(define (rmt:send-receive cmd rid params #!key (attemptnum 1)) ;; start attemptnum at 1 so the modulo below works as expected
  ;; side-effect: clean out old connections





  (mutex-lock! *rmt:srmutex*)


  (let ((expire-time (- (current-seconds) (server:get-timeout) 10))) ;; don't forget the 10 second margin
    (for-each 
     (lambda (run-id)
       (let ((connection (rmt:get-cinfo run-id)))
         (if (and (vector? connection)
        	  (< (http-transport:server-dat-get-last-access connection) expire-time)) ;; BB> BBTODO: make this generic, not http transport specific.
             (begin
               (debug:print-info 0 *default-log-port* "Discarding connection to server for run-id " run-id ", too long between accesses")
               (hash-table-delete! *runremote* run-id)))))
     (hash-table-keys *runremote*)))
  
  (let* ((run-id     (if rid rid 0))
	 (connection-info (rmt:get-connection-info-start-server-if-none run-id)))
    ;; the nmsg method does the encoding under the hood (the http method should be changed to do this also)

    (if connection-info
	;; use the server if have connection info
	(let* ((transport-type (rmt:run-id->transport-type run-id))
               
               ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
               ;;  Here, we make request to remote server
               ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
               (dat     (begin
                          
                          (case transport-type ;; BB: replaced *transport-type* global with run-id specific transport-type
                            ((http)(condition-case
                                    (http-transport:client-api-send-receive run-id connection-info cmd params) 
                                    ((commfail)(vector #f "communications fail"))
                                    ((exn)(vector #f "other fail"))))
                            ((rpc) (rpc-transport:client-api-send-receive run-id connection-info cmd params)) ;; BB: let us error out for now
                            (else  
                             (debug:print-error 0 *default-log-port* "(1) Transport [" transport-type
                                                "] specified for run-id [" run-id
                                                "] is not implemented in rmt:send-receive.  Cannot proceed." (symbol? transport-type))
                             (vector #f (conc "transport ["transport-type"] unimplemented"))))))
               
               
	       (success (if (vector? dat) (vector-ref dat 0) #f))
	       (res     (if (vector? dat) (vector-ref dat 1) #f)))


	  (if (vector? connection-info)(http-transport:server-dat-update-last-access connection-info)) ;; BB> BBTODO: make this generic, not http transport specific.
	  (if success
	      (begin
                (mutex-unlock! *rmt:srmutex*)
		;; (mutex-unlock! *send-receive-mutex*)
		(case transport-type 
		  ((http rpc) res) ;; (db:string->obj res))
                  (else
                   (debug:print-error 0 *default-log-port* "(2) Transport [" transport-type
                                      "] specified for run-id [" run-id
                                      "] is not implemented in rmt:send-receive.  Cannot proceed. Also unexpected since this branch follows success which would follow a suported transport...")
                   #f)
                  )) ;; (vector-ref res 1)))
              
              ;; no success...
	      (begin ;; let ((new-connection-info (client:setup run-id)))
		(debug:print 0 *default-log-port* "WARNING: Communication failed, trying call to rmt:send-receive again.")
                (mutex-unlock! *rmt:srmutex*)




                (case transport-type
                  
                  ((http rpc)
                   (hash-table-delete! *runremote* run-id) ;; don't keep using the same connection
                   ;; NOTE: killing server causes this process to block forever. No idea why. Dec 2. 
                   ;; (if (eq? (modulo attemptnum 5) 0)
                   ;;     (tasks:kill-server-run-id run-id tag: "api-send-receive-failed"))
                   ;; (mutex-unlock! *send-receive-mutex*) ;; close the mutex here to allow other threads access to communications
                   (tasks:start-and-wait-for-server (tasks:open-db) run-id 15)


                   ;; (nmsg-transport:client-api-send-receive run-id connection-info cmd param remtries: (- remtries 1))))))
                   
                   ;; no longer killing the server in http-transport:client-api-send-receive
                   ;; may kill it here but what are the criteria?
                   ;; start with three calls then kill server
                   ;; (if (eq? attemptnum 3)(tasks:kill-server-run-id run-id))
                   ;; (thread-sleep! 2)
                   (rmt:send-receive cmd run-id params attemptnum: (+ attemptnum 1)))
                  (else
                   (debug:print-error 0 *default-log-port* "(3) Transport [" transport-type
                                      "] specified for run-id [" run-id
                                      "] is not implemented in rmt:send-receive.  Cannot proceed.")
                   (exit 1))))))


        
	;; no connection info; try to start a server
	;;
	;; Note: The tasks db was checked for a server in starting mode in the rmt:get-connection-info call
	;;
        (begin
          (mutex-unlock! *rmt:srmutex*)








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;; RA => e.g. usage (rmt:send-receive 'get-var #f (list varname))
;;

(define *rmt:srmutex* (make-mutex))

(define (rmt:send-receive cmd rid params #!key (attemptnum 1)) ;; start attemptnum at 1 so the modulo below works as expected
  ;; side-effect: clean out old connections

  (when (eq? (modulo attemptnum 5) 0)
    (debug:print-error 0 *default-log-port* "rmt:send-receive did not succeed after "(sub1 attemptnum)" tries.  Aborting. (cmd="cmd" rid="rid" param="params)
    (exit 1))

  (mutex-lock! *rmt:srmutex*)

  ;; expire connections
  (let ((expire-time (- (current-seconds) (server:get-timeout) 10))) ;; don't forget the 10 second margin
    (for-each 
     (lambda (run-id)
       (let ((connection (rmt:get-cinfo run-id)))
         (if (and (vector? connection)
        	  (< (http-transport:server-dat-get-last-access connection) expire-time)) ;; BB> BBTODO: make this generic, not http transport specific.
             (begin
               (debug:print-info 0 *default-log-port* "Discarding connection to server for run-id " run-id ", too long between accesses")
               (hash-table-delete! *runremote* run-id)))))
     (hash-table-keys *runremote*)))
  
  (let* ((run-id     (if rid rid 0))
	 (connection-info (rmt:get-connection-info-start-server-if-none run-id)))
    ;; the nmsg method does the encoding under the hood (the http method should be changed to do this also)
    (BB> "in rmt:send-receive; run-id="run-id";;connection-info="connection-info)
    (if connection-info
	;; use the server if have connection info
	(let* ((transport-type (rmt:run-id->transport-type run-id))

               ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
               ;;  Here, we make request to remote server
               ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
               (dat     (begin
                          
                          (case transport-type ;; BB: replaced *transport-type* global with run-id specific transport-type
                            ((http)(condition-case
                                    (http-transport:client-api-send-receive run-id connection-info cmd params) 
                                    ((commfail)(vector #f "communications fail"))
                                    ((exn)(vector #f "other fail"))))
                            ((rpc) (rpc-transport:client-api-send-receive run-id connection-info cmd params)) ;; BB: let us error out for now
                            (else  
                             (debug:print-error 0 *default-log-port* "(1) Transport [" transport-type
                                                "] specified for run-id [" run-id
                                                "] is not implemented in rmt:send-receive.  Cannot proceed." (symbol? transport-type))
                             (vector #f (conc "transport ["transport-type"] unimplemented"))))))
               
               
	       (success (if (vector? dat) (vector-ref dat 0) #f))
	       (res     (if (vector? dat) (vector-ref dat 1) #f)))
          (BB> "in rmt:send-receive; transport-type="transport-type" success="success" connection-info="connection-info" res="res " dat="dat)
          (if (and success (vector? connection-info))
              (http-transport:server-dat-update-last-access connection-info)) ;; BB> BBTODO: make this generic, not http transport specific.
	  (if success
	      (begin
                (mutex-unlock! *rmt:srmutex*)
		;; (mutex-unlock! *send-receive-mutex*)
		(case transport-type 
		  ((http rpc) res) ;; (db:string->obj res))
                  (else
                   (debug:print-error 0 *default-log-port* "(2) Transport [" transport-type
                                      "] specified for run-id [" run-id
                                      "] is not implemented in rmt:send-receive.  Cannot proceed. Also unexpected since this branch follows success which would follow a suported transport...")
                   #f)
                  )) ;; (vector-ref res 1)))
              
              ;; no success...
	      (begin ;; let ((new-connection-info (client:setup run-id)))
		(debug:print 0 *default-log-port* "WARNING: Communication failed, trying call to rmt:send-receive again.")
                (mutex-unlock! *rmt:srmutex*)
                (rmt:del-cinfo run-id) ;; don't keep using the same connection
                (rmt:send-receive cmd rid params attemptnum: attemptnum)


                ;; (case transport-type
                  
                ;;   ((http rpc)

                ;;    ;; NOTE: killing server causes this process to block forever. No idea why. Dec 2. 
                ;;    ;; (if (eq? (modulo attemptnum 5) 0)
                ;;    ;;     (tasks:kill-server-run-id run-id tag: "api-send-receive-failed"))
                ;;    ;; (mutex-unlock! *send-receive-mutex*) ;; close the mutex here to allow other threads access to communications
                ;;    (tasks:start-and-wait-for-server (tasks:open-db) run-id 15)
                ;;    (thread-sleep! 5)
                                   
                ;;    ;; (nmsg-transport:client-api-send-receive run-id connection-info cmd param remtries: (- remtries 1))))))
                   
                ;;    ;; no longer killing the server in http-transport:client-api-send-receive
                ;;    ;; may kill it here but what are the criteria?
                ;;    ;; start with three calls then kill server
                ;;    ;; (if (eq? attemptnum 3)(tasks:kill-server-run-id run-id))
                ;;    ;; (thread-sleep! 2)
                ;;    (rmt:send-receive cmd run-id params attemptnum: (+ attemptnum 1)))
                ;;   (else
                ;;    (debug:print-error 0 *default-log-port* "(3) Transport [" transport-type
                ;;                       "] specified for run-id [" run-id
                ;;                       "] is not implemented in rmt:send-receive.  Cannot proceed.")
                ;;    (exit 1)))

                )))
        
	;; no connection info; try to start a server
	;;
	;; Note: The tasks db was checked for a server in starting mode in the rmt:get-connection-info call
	;;
        (begin
          (mutex-unlock! *rmt:srmutex*)
︙︙

Modified rpc-transport.scm from [d50c6c50d7] to [f8b4c106d1].

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	(debug:print-error 0 *default-log-port* "call to rpc-transport:server-dat-update-last-access with non-vector!!"))))


(define *api-exec-ht* (make-hash-table))

;; let's see if caching the rpc stub curbs thread-profusion on server side
(define (rpc-transport:get-api-exec iface port)
  (let* ((lu (hash-table-ref/default *api-exec-ht* '(iface . port) #f)))
    (if lu
        lu
        (let ((res (rpc:procedure 'api-exec iface port)))
          (hash-table-set! *api-exec-ht* '(iface . port) res)
          res))))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; this client-side procedure makes rpc call to server and returns result
;;
(define (rpc-transport:client-api-send-receive run-id serverdat cmd params #!key (numretries 3))
  (BB> "entered nsport:client-api-send-receive with run-id="run-id " serverdat="serverdat" cmd="cmd" params="params" numretries="numretries)
  (if (not (vector? serverdat))
      (begin
        (BB> "WHAT?? for run-id="run-id", serverdat="serverdat)
        (print-call-chain)
        (exit 1)))
  (let* ((iface (rpc-transport:server-dat-get-iface serverdat))
         (port  (rpc-transport:server-dat-get-port serverdat))
         (res #f)
         (api-exec (rpc-transport:get-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))








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	(debug:print-error 0 *default-log-port* "call to rpc-transport:server-dat-update-last-access with non-vector!!"))))


(define *api-exec-ht* (make-hash-table))

;; let's see if caching the rpc stub curbs thread-profusion on server side
(define (rpc-transport:get-api-exec iface port)
  (let* ((lu (hash-table-ref/default *api-exec-ht* (cons iface  port) #f)))
    (if lu
        lu
        (let ((res (rpc:procedure 'api-exec iface port)))
          (hash-table-set! *api-exec-ht* (cons iface port) res)
          res))))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; this client-side procedure makes rpc call to server and returns result
;;
(define (rpc-transport:client-api-send-receive run-id serverdat cmd params #!key (numretries 3))
  (BB> "entered rpc-transport:client-api-send-receive with run-id="run-id " serverdat="serverdat" cmd="cmd" params="params" numretries="numretries)
  (if (not (vector? serverdat))
      (begin
        (BB> "WHAT?? for run-id="run-id", serverdat="serverdat)
        (print-call-chain)
        (exit 1)))
  (let* ((iface (rpc-transport:server-dat-get-iface serverdat))
         (port  (rpc-transport:server-dat-get-port serverdat))
         (res #f)
         (api-exec (rpc-transport:get-api-exec iface port))  ;; chached by host/port. may need to clear...
         (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))
︙︙
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	 (thread-terminate! th2)
         (BB> "alt got res="res)
	 (debug:print-info 11 *default-log-port* "got res=" res)
	 (if (vector? res)
             (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:")








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	 (thread-terminate! th2)
         (BB> "alt got res="res)
	 (debug:print-info 11 *default-log-port* "got res=" res)
	 (if (vector? res)
             (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 >>"res"<<")
                ;;(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:")
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