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Comment:rpc-transport:client-setup implemented and tested
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SHA1: 9102de026216169b3c38e22002f3a033e54d46a0
User & Date: bjbarcla on 2016-11-03 21:31:07
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Context
2016-11-04
17:54
got rpc to work... at least one call from megatest -repl :) check-in: 985c43c44c user: bjbarcla tags: rpc-transport
2016-11-03
21:31
rpc-transport:client-setup implemented and tested check-in: 9102de0262 user: bjbarcla tags: rpc-transport
16:52
another pass to allow distinct per-run-id transports to be used check-in: 140ed85cfb user: bjbarcla tags: rpc-transport
Changes
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Modified client.scm from [a2787b3361] to [01b4fde796].

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             (let ((num-available (tasks:bb-num-in-available-state run-id)))
               (debug:print-info 0 *default-log-port* "client:setup, no server registered, remaining-tries=" remaining-tries " num-available=" num-available)
               (if (< num-available 2)
                   (server:try-running run-id))
               (thread-sleep! (+ 5 (random (- 20 remaining-tries))))  ;; give server a little time to start up, randomize a little to avoid start storms.
               (client:setup run-id remaining-tries: (- remaining-tries 1))))))
      ((http)(client:setup-http run-id server-dat remaining-tries))
      ;; ((rpc) (rpc-transport:client-setup run-id)) ;;(client:setup-rpc run-id)) rpc not implemented;  want to see a failure here for now.
      (else
       (debug:print-error 0 *default-log-port* "(6) Transport ["
                          transport "] specified for run-id [" run-id "] is not implemented in client:setup.  Cannot proceed.")
       (exit 1)))))


;; client:setup-http
;;
;; For http transport, robustly ensure an advertised-running server is actually working and responding, and
;; establish tcp connection to server.  For servers marked running but not responding, kill them and clear from mdb
;; 
(define (client:setup-http run-id server-dat remaining-tries)








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             (let ((num-available (tasks:bb-num-in-available-state run-id)))
               (debug:print-info 0 *default-log-port* "client:setup, no server registered, remaining-tries=" remaining-tries " num-available=" num-available)
               (if (< num-available 2)
                   (server:try-running run-id))
               (thread-sleep! (+ 5 (random (- 20 remaining-tries))))  ;; give server a little time to start up, randomize a little to avoid start storms.
               (client:setup run-id remaining-tries: (- remaining-tries 1))))))
      ((http)(client:setup-http run-id server-dat remaining-tries))
      ((rpc) (rpc-transport:client-setup run-id server-dat remtries: remaining-tries)) 
      (else
       (debug:print-error 0 *default-log-port* "(6) Transport ["
                          transport "] specified for run-id [" run-id "] is not implemented in client:setup.  Cannot proceed.")
       (exit 1)))))


;; client:setup-http
;;
;; For http transport, robustly ensure an advertised-running server is actually working and responding, and
;; establish tcp connection to server.  For servers marked running but not responding, kill them and clear from mdb
;; 
(define (client:setup-http run-id server-dat remaining-tries)
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        (begin
          (hash-table-set! *runremote* run-id start-res) ;; side-effect - *runremote* cache init fpr rmt:*
          (debug:print-info 2 *default-log-port* "connected to " (http-transport:server-dat-make-url start-res))
          start-res)
        (begin    ;; login failed but have a server record, clean out the record and try again
          (debug:print-info 0 *default-log-port* "client:setup-http, login failed, will attempt to start server ... start-res=" start-res ", run-id=" run-id ", server-dat=" server-dat)
          (http-transport:close-connections run-id)
          (hash-table-delete! *runremote* run-id)
          (tasks:kill-server-run-id run-id)
          (tasks:bb-server-force-clean-run-record  run-id iface port
                                                   " client:setup-http (server-dat = #t)")
          (if (> remaining-tries 8)
              (thread-sleep! (+ 1 (random 5))) ;; spread out the starts a little
              (thread-sleep! (+ 15 (random 20)))) ;; it isn't going well. give it plenty of time
          (server:try-running run-id)
          (thread-sleep! 5)   ;; give server a little time to start up








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        (begin
          (hash-table-set! *runremote* run-id start-res) ;; side-effect - *runremote* cache init fpr rmt:*
          (debug:print-info 2 *default-log-port* "connected to " (http-transport:server-dat-make-url start-res))
          start-res)
        (begin    ;; login failed but have a server record, clean out the record and try again
          (debug:print-info 0 *default-log-port* "client:setup-http, login failed, will attempt to start server ... start-res=" start-res ", run-id=" run-id ", server-dat=" server-dat)
          (http-transport:close-connections run-id)
          (hash-table-delete! *runremote* run-id) ;; BB: suspect there is nothing to delete ...
          (tasks:kill-server-run-id run-id) ;; -9 so the hung processes dont eat 100% when not responding to sigterm.
          (tasks:bb-server-force-clean-run-record  run-id iface port
                                                   " client:setup-http (server-dat = #t)")
          (if (> remaining-tries 8)
              (thread-sleep! (+ 1 (random 5))) ;; spread out the starts a little
              (thread-sleep! (+ 15 (random 20)))) ;; it isn't going well. give it plenty of time
          (server:try-running run-id)
          (thread-sleep! 5)   ;; give server a little time to start up
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Modified rpc-transport.scm from [4a03110bb8] to [0b43c472fb].

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

(define (rpc-transport:client-setup run-id #!key (remtries 10))
  (if *runremote*
      (begin
	(debug:print-error 0 *default-log-port* "Attempt to connect to server but already connected")
	#f)
      (let* ((host-info (hash-table-ref/default *runremote* run-id #f))) ;; (open-run-close db:get-var #f "SERVER"))
	(if host-info
	    (let ((iface    (car host-info))
		  (port     (cadr host-info))
		  (ping-res ((rpc:procedure 'server:login host port) *toppath*)))
	      (if ping-res
		  (let ((server-dat (list iface port #f #f #f)))
		    (hash-table-set! *runremote* run-id server-dat)
		    server-dat)
		  (begin
		    (server:try-running run-id)
		    (thread-sleep! 2)
		    (rpc-transport:client-setup run-id (- remtries 1)))))
 	    (let* ((server-db-info (open-run-close tasks:get-server-info tasks:open-db run-id)))
 	      (debug:print-info 0 *default-log-port* "client:setup server-dat=" server-dat ", remaining-tries=" remaining-tries)
	      (if server-db-info
		  (let* ((iface     (tasks:hostinfo-get-interface server-db-info))

 			 (port      (tasks:hostinfo-get-port      server-db-info))
			 (server-dat (list iface port #f #f #f))

 			 (ping-res  ((rpc:procedure 'server:login host port) *toppath*)))


 		    (if start-res
 			(begin

 			  (hash-table-set! *runremote* run-id server-dat)
			  server-dat)
			(begin
			  (server:try-running run-id)



			  (thread-sleep! 2)
			  (rpc-transport:client-setup run-id (- remtries 1)))))
		  (begin
		    (server:try-running run-id)
		    (thread-sleep! 2)
		    (rpc-transport:client-setup run-id (- remtries 1)))))))))
;; 
;; 	     (port     (if (and hostinfo (> (length hostdat) 1))(cadr hostdat) #f)))
;; 	(if (and port
;; 		 (string->number port))
;; 	    (let ((portn (string->number port)))
;; 	      (debug:print-info 2 *default-log-port* "Setting up to connect to host " host ":" port)
;; 	      (handle-exceptions
;; 	       exn
;; 	       (begin
;; 		 (debug:print-error 0 *default-log-port* "Failed to open a connection to the server at host: " host " port: " port)
;; 		 (debug:print 0 *default-log-port* "   EXCEPTION: " ((condition-property-accessor 'exn 'message) exn))
;; 		 ;; (open-run-close 
;; 		 ;;  (lambda (db . param) 
;; 		 ;;    (sqlite3:execute db "DELETE FROM metadat WHERE var='SERVER'"))
;; 		 ;;  #f)
;; 		 (set! *runremote* #f))
;; 	       (if (and (not (args:get-arg "-server")) ;; no point in the server using the server using the server
;; 			((rpc:procedure 'server:login host portn) *toppath*))
;; 		   (begin
;; 		     (debug:print-info 2 *default-log-port* "Logged in and connected to " host ":" port)
;; 		     (set! *runremote* (vector host portn)))
;; 		   (begin
;; 		     (debug:print-info 2 *default-log-port* "Failed to login or connect to " host ":" port)
;; 		     (set! *runremote* #f)))))
;; 	    (debug:print-info 2 *default-log-port* "no server available")))))









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	   #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))
         (runremote-server-dat (vector iface port #f #f #f (current-seconds) 'rpc)) ;; http version := (vector iface port api-uri api-url api-req (current-seconds) 'http  )
         (ping-res (retry-thunk (lambda ()  ;; make 3 attempts to ping.
                                  ((rpc:procedure 'server:login iface port) *toppath*))
                                retries: 3)))
    ;; we got here from rmt:get-connection-info on the condition that *runremote* has no entry for run-id...
    (if ping-res
        (begin
          (debug:print-info 0 *default-log-port* "rpc-transport:client-setup CONNECTION ESTABLISHED run-id="run-id" server-dat=" server-dat)
          (hash-table-set! *runremote* run-id runremote-server-dat)  ;; side-effect - *runremote* cache init fpr rmt:*
          runremote-server-dat)
        (begin ;; login failed but have a server record, clean out the record and try again
          (tasks:kill-server-run-id run-id)
          (tasks:bb-server-force-clean-run-record  run-id iface port
                                                   " rpc-transport:client-setup (server-dat = #t)")
          (if (> remtries 2)
              (thread-sleep! (+ 1 (random 5))) ;; spread out the starts a little
              (thread-sleep! (+ 15 (random 20)))) ;; it isn't going well. give it plenty of time

          (server:try-running run-id)
          (thread-sleep! 5)   ;; give server a little time to start up
          (client:setup run-id remaining-tries: (sub1 remtries))

























          " rpc-transport:client-setup (server-dat = #t)"))))

Modified tasks.scm from [133d4feb50] to [736f8afe48].

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	 (sdat    (tasks:get-server-info (db:delay-if-busy tdbdat) run-id)))
    (if sdat
	(let ((hostname (vector-ref sdat 6))
	      (pid      (vector-ref sdat 5))
	      (server-id (vector-ref sdat 0)))
	  (tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "killed")
	  (debug:print-info 0 *default-log-port* "Killing server " server-id " for run-id " run-id " on host " hostname " with pid " pid)
	  (tasks:kill-server hostname pid kill-switch: "-9") ;; BB: added -9, let's not be kind here.  we need it to die
	  (tasks:server-delete-record (db:delay-if-busy tdbdat) server-id tag) )
	(debug:print-info 0 *default-log-port* "No server found for run-id " run-id ", nothing to kill"))
    ;; (sqlite3:finalize! tdb)
    ))
    
;;======================================================================
;; M O N I T O R S








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	 (sdat    (tasks:get-server-info (db:delay-if-busy tdbdat) run-id)))
    (if sdat
	(let ((hostname (vector-ref sdat 6))
	      (pid      (vector-ref sdat 5))
	      (server-id (vector-ref sdat 0)))
	  (tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "killed")
	  (debug:print-info 0 *default-log-port* "Killing server " server-id " for run-id " run-id " on host " hostname " with pid " pid)
	  (tasks:kill-server hostname pid kill-switch: "-9") ;; BB: added -9, let's not be kind here.  we need it to die so it isn't a 100% cpu zombie
	  (tasks:server-delete-record (db:delay-if-busy tdbdat) server-id tag) )
	(debug:print-info 0 *default-log-port* "No server found for run-id " run-id ", nothing to kill"))
    ;; (sqlite3:finalize! tdb)
    ))
    
;;======================================================================
;; M O N I T O R S
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