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Comment:Centralize server starts to server 0 and pace out same-run-id starts by 40 seconds
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Timelines: family | ancestors | descendants | both | v1.60
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SHA1: 837646d7e82ead63c83bdee17c13db73ee22b69f
User & Date: matt on 2014-02-25 23:11:08
Other Links: branch diff | manifest | tags
Context
2014-02-26
14:36
Partial fix to server start issue (breaks startup when db contains dead server). check-in: 05fa3869fb user: mrwellan tags: v1.60
2014-02-25
23:11
Centralize server starts to server 0 and pace out same-run-id starts by 40 seconds check-in: 837646d7e8 user: matt tags: v1.60
20:53
Added some missing checks for deleted in queries for runs check-in: 8f59526787 user: matt tags: v1.60
Changes
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Modified api.scm from [7b83b1f06b] to [be6d379826].

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(declare (uses rmt))
(declare (uses db))

;; These are called by the server on recipt of /api calls

(define (api:execute-requests dbstruct cmd params)
  (case (string->symbol cmd)
    ;; SERVERS
    ((start-server)                (apply server:kind-run params))
    ;; ((kill-server)
    ;;  (db:sync-tables (db:tbls *inmemdb*) *inmemdb* *db*)  ;; (db:sync-to *inmemdb* *db*)
    ;;  (let ((hostname (car  *runremote*))
    ;;        (port     (cadr *runremote*))
    ;;        (pid      (if (null? params) #f (car params)))
    ;;        (th1      (make-thread (lambda ()(thread-sleep! 3)(debug:print 0 "Server exiting!")(exit 0)) "Server exit thread")))
    ;;    (debug:print 0 "WARNING: Server on " hostname ":" port " going down by user request!")
    ;;    (debug:print-info 1 "current pid=" (current-process-id))
    ;;    (open-run-close tasks:server-deregister tasks:open-db 
    ;;     	       hostname
    ;;     	       port: port)
    ;;    (set! *server-run* #f)
    ;;    (thread-sleep! 3)
    ;;    (if pid 
    ;;        (process-signal pid signal/kill)
    ;;        (thread-start! th1))
    ;;    '(#t "exit process started")))

    ;; KEYS
    ((get-key-val-pairs)            (apply db:get-key-val-pairs dbstruct params))
    ((get-keys)                     (db:get-keys dbstruct))

    ;; TESTS
    ;; json doesn't do vectors, convert to list
    ((get-test-info-by-id)	       (apply db:get-test-info-by-id dbstruct params))
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    ((general-call)                 (let ((stmtname   (car params))
					  (run-id     (cadr params))
					  (realparams (cddr params)))
				      (db:with-db dbstruct run-id #t ;; these are all for modifying the db
						  (lambda (db)
						    (db:general-call db stmtname realparams)))))
    ((sync-inmem->db)               (db:sync-touched dbstruct run-id force-sync: #t))
    ;; ((kill-server)
    ;;  (db:sync-tables (db:tbls *inmemdb*) *inmemdb* *db*)  ;; (db:sync-to *inmemdb* *db*)
    ;;  (let ((hostname (car  *runremote*))
    ;;        (port     (cadr *runremote*))
    ;;        (pid      (if (null? params) #f (car params)))
    ;;        (th1      (make-thread (lambda ()(thread-sleep! 3)(debug:print 0 "Server exiting!")(exit 0)) "Server exit thread")))
    ;;    (debug:print 0 "WARNING: Server on " hostname ":" port " going down by user request!")
    ;;    (debug:print-info 1 "current pid=" (current-process-id))
    ;;    (open-run-close tasks:server-deregister tasks:open-db 
    ;;     	       hostname
    ;;     	       port: port)
    ;;    (set! *server-run* #f)
    ;;    (thread-sleep! 3)
    ;;    (if pid 
    ;;        (process-signal pid signal/kill)
    ;;        (thread-start! th1))
    ;;    '(#t "exit process started")))
    ((sdb-qry)                      (apply sdb:qry params))

    ;; TESTMETA
    ((testmeta-get-record)       (apply db:testmeta-get-record dbstruct params))
    ((testmeta-add-record)       (apply db:testmeta-add-record dbstruct params))
    ((testmeta-update-field)     (apply db:testmeta-update-field dbstruct params))
    (else
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Modified client.scm from [c34489a609] to [470e0682b1].

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			      (server:try-running run-id)
			      (thread-sleep! 10) ;; give server a little time to start up
			      (client:setup run-id remaining-tries: 10)) ;; (- remaining-tries 1)))
			    (begin
			      (thread-sleep! 5)
			      (client:setup run-id remaining-tries: (- remaining-tries 1))))))
		  (begin    ;; no server registered
		    (thread-sleep! 2)
		    (server:try-running run-id)
		    (thread-sleep! 10) ;; give server a little time to start up
		    (client:setup run-id remaining-tries: (- remaining-tries 1)))))))))
		    (thread-sleep! 2) 
		    (if (< (open-run-close tasks:num-in-available-state tasks:open-db run-id) 2)
			(begin
			  (server:try-running run-id)
			  (thread-sleep! 10) ;; give server a little time to start up
			  (client:setup run-id remaining-tries: (- remaining-tries 1)))
			(begin
			  (thread-sleep! 10)
			  (client:setup run-id remaining-tries: remainint-tries))))))))))

;; keep this as a function to ease future 
(define (client:start run-id server-info)
  (http-transport:client-connect run-id 
				 (tasks:hostinfo-get-interface server-info)
				 (tasks:hostinfo-get-port server-info)))
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Modified common.scm from [98ab0c8aab] to [8ab78fa41e].

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(define *time-to-exit*      #f)
(define *received-response* #f)
(define *default-numtries*  10)
(define *server-run*        #t)
(define *db-write-access*   #t)
(define *inmemdb*           #f)
(define *run-id*            #f)
(define *server-kind-run*   (make-hash-table))

(define *target*            (make-hash-table)) ;; cache the target here; target is keyval1/keyval2/.../keyvalN
(define *keys*              (make-hash-table)) ;; cache the keys here
(define *keyvals*           (make-hash-table))
(define *toptest-paths*     (make-hash-table)) ;; cache toptest path settings here
(define *test-paths*        (make-hash-table)) ;; cache test-id to test run paths here
(define *test-ids*          (make-hash-table)) ;; cache run-id, testname, and item-path => test-id
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Modified http-transport.scm from [e1da68c36b] to [c4fe5c65f6].

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	 (begin 
	   (debug:print 0 "WARNING: failed to start on portnum: " portnum ", trying next port")
	   (thread-sleep! 0.1)

	   ;; get_next_port goes here

	   (http-transport:try-start-server ipaddrstr (+ portnum 1) server-id))
	 (begin
	   (open-run-close tasks:server-delete tasks:open-db ipaddrstr portnum " http-transport:try-start-server")
	 (print "ERROR: Tried and tried but could not start the server")))
	   (print "ERROR: Tried and tried but could not start the server"))))
   ;; any error in following steps will result in a retry
   (set! *server-info* (list ipaddrstr portnum))
   (open-run-close tasks:server-set-interface-port 
		   tasks:open-db 
		   server-id 
		   ipaddrstr portnum)
   (debug:print 1 "INFO: Trying to start server on " ipaddrstr ":" portnum)
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Modified rmt.scm from [a00bf53eda] to [3da7dfaf01].

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      (json-read))))

;;======================================================================
;;
;; A C T U A L   A P I   C A L L S  
;;
;;======================================================================

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

(define (rmt:kill-server run-id)
  (rmt:send-receive 'kill-server run-id (list run-id)))

(define (rmt:start-server run-id)
  (rmt:send-receive 'start-server 0 (list run-id)))

;;======================================================================
;;  M I S C
;;======================================================================

(define (rmt:login run-id)
  (rmt:send-receive 'login run-id (list *toppath* megatest-version run-id *my-client-signature*)))

;; This login does no retries under the hood - it acts a bit like a ping.
;;
(define (rmt:login-no-auto-client-setup connection-info run-id)
  (rmt:send-receive-no-auto-client-setup connection-info 'login run-id (list *toppath* megatest-version run-id *my-client-signature*)))
  
(define (rmt:kill-server run-id)
  (rmt:send-receive 'kill-server run-id (list run-id)))

;; hand off a call to one of the db:queries statements
;; added run-id to make looking up the correct db possible 
;;
(define (rmt:general-call stmtname run-id . params)
  (rmt:send-receive 'general-call run-id (append (list stmtname run-id) params)))

(define (rmt:sync-inmem->db run-id)
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Modified server.scm from [9a921aa4ae] to [c4fc1a172b].

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;;

;; all routes though here end in exit ...
;;
;; start_server
;;
(define (server:launch run-id)
  ;; (if (server:check-if-running run-id)
  ;; a server is already running
  ;; (exit)
  (http-transport:launch run-id))

;; (define (server:launch-no-exit run-id)
;;   (if (server:check-if-running run-id)
;;       #t ;; if running
;;       (http-transport:launch run-id)))

;;======================================================================
;; Q U E U E   M A N A G E M E N T
;;======================================================================

;; We don't want to flush the queue if it was just flushed
(define *server:last-write-flush* (current-milliseconds))

;; Flush the queue every third of a second. Can we assume that setup-for-run 
;; has already been done?
;; (define (server:write-queue-handler)
;;   (if (setup-for-run)
;;       (let ((db (open-db)))
;; 	(let loop ()
;; 	  (let ((last-write-flush-time #f))
;; 	    (mutex-lock! *incoming-mutex*)
;; 	    (set! last-write-flush-time *server:last-write-flush*)
;; 	    (mutex-unlock! *incoming-mutex*)
;; 	    (if (> (- (current-milliseconds) last-write-flush-time) 10)
;; 		(begin
;; 		  (mutex-lock! *db:process-queue-mutex*)
;; 		  (db:process-cached-writes db)
;; 		  (mutex-unlock! *db:process-queue-mutex*)
;; 		  (thread-sleep! 0.005))))
;; 	  (loop)))
;;       (begin
;; 	(debug:print 0 "ERROR: failed to setup for Megatest in server:write-queue-handler")
;; 	(exit 1))))
    
;;======================================================================
;; S E R V E R   U T I L I T I E S 
;;======================================================================

;; Generate a unique signature for this server
(define (server:mk-signature)
  (message-digest-string (md5-primitive) 
			 (with-output-to-string
			   (lambda ()
			     (write (list (current-directory)
					  (argv)))))))


;; When using zmq this would send the message back (two step process)
;; with spiffy or rpc this simply returns the return data to be returned
;; 
(define (server:reply return-addr query-sig success/fail result)
  (db:obj->string (vector success/fail query-sig result)))

;; > file 2>&1 
(define (server:try-running run-id)
  (let* ((rand-name (random 100))
;; Given a run id start a server process    ### NOTE ### > file 2>&1 
;; if the run-id is zero and the target-host is set 
;; try running on that host
;;
(define  (server:run run-id)
  (let* ((target-host (configf:lookup *configdat* "server" "homehost" ))
	 (cmdln (conc (if (getenv "MT_MEGATEST") (getenv "MT_MEGATEST") "megatest")
		    ;; " -server - -run-id " run-id " name=" rand-name " > " *toppath* "/db/" run-id "-" rand-name ".log 2>&1 &")))
		      " -server - -run-id " run-id " >> " *toppath* "/db/" run-id ".log 2>&1 &")))
    (debug:print 0 "INFO: Starting server (" cmdln ") as none running ...")
    (push-directory *toppath*)
    (if target-host
	(begin
	  (set-environment-variable "TARGETHOST" target-host)
	  (system (conc "nbfake " cmdln)))
    (system cmdln)
	(system cmdln))
    (pop-directory)))

;; kind start up of servers, wait 40 seconds before allowing another server for a given
;; run-id to be launched
(define (server:kind-run run-id)
  (let ((last-run-time (hash-table-ref/default *server-kind-run* run-id #f)))
    (if (or (not last-run-time)
	    (> (- (current-seconds) last-run-time) 40))
	(begin
	  (server:run run-id)
	  (hash-table-set! *server-kind-run* run-id (current-seconds))))))

;; The generic run a server command. Dispatches the call to server 0 if run-id != 0
;; 
(define (server:try-running run-id)
  (if (eq? run-id 0)
      (server:run run-id)
      (rmt:start-server run-id)))

(define (server:check-if-running run-id)
  (let loop ((server (open-run-close tasks:get-server tasks:open-db run-id))
	     (trycount 0))
    (thread-sleep! 2)
    (if server
	;; note: client:start will set *runremote*. this needs to be changed
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