Megatest

;;
;; There are two scenarios. 
;;   1. We are a test manager and we received *transport-type* and *runremote* via cmdline
;;   2. We are a run tests, list runs or other interactive process and we must figure out
;;      *transport-type* and *runremote* from the monitor.db
;;
;; client:setup
;;
;; lookup_server, 
;;
(define (client:setup run-id #!key (remaining-tries 3))
  (if (not *toppath*)
      (if (not (setup-for-run))
	  (begin
	    (debug:print 0 "ERROR: failed to find megatest.config, exiting")
	    (exit))))
  ;; (push-directory *toppath*) ;; This is probably NOT needed 

	ping_server -> exit [label=alive];
	ping_server -> remove_server_record [label=dead];
	remove_server_record -> set_available;
	set_available -> avail_delay [label="delay 3s"];
	avail_delay -> "first_in_queue?";

	"first_in_queue?" -> set_running [label=yes];
	set_running -> get_next_port -> handle_requests;
	"first_in_queue?" -> "dead_entry_in_queue?" [label=no];
	"dead_entry_in_queue?" -> "server_running?" [label=no];
	"dead_entry_in_queue?" -> "remove_dead_entries" [label=yes];
	remove_dead_entries -> "server_running?";

	handle_requests -> start_shutdown [label="no traffic"];
	handle_requests -> shutdown_request;
	start_shutdown -> shutdown_delay;
	shutdown_request -> shutdown_delay;
	shutdown_delay -> exit;
	

   exn
   (begin
     (print-error-message exn)
     (if (< portnum 9000)
	 (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))
	 (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 

	 (thread-start! th1)
	 (thread-start! th2)
	 (thread-join! th1)
	 (thread-terminate! th2)
	 (debug:print-info 11 "got res=" res)
	 res)))))

;;
;; connect
;;
(define (http-transport:client-connect run-id iface port)
  (let* ((login-res   #f)
	 (uri-dat     (make-request method: 'POST uri: (uri-reference (conc "http://" iface ":" port "/ctrl"))))
	 (uri-api-dat (make-request method: 'POST uri: (uri-reference (conc "http://" iface ":" port "/api"))))
	 (serverdat   (list iface port uri-dat uri-api-dat)))
    (hash-table-set! *runremote* run-id serverdat) ;; may or may not be good ...
    (set! login-res (rmt:login run-id))

	 (tdb         (tasks:open-db))
	 (server-timeout (let ((tmo (config-lookup  *configdat* "server" "timeout")))
			   (if (and (string? tmo)
				    (string->number tmo))
			       (* 60 60 (string->number tmo))
			       ;; default to three days
			       (* 3 24 60 60)))))
    ;;
    ;; set_running
    ;;
    (tasks:server-set-state! tdb server-id "running")
    (let loop ((count 0))
      ;; Use this opportunity to sync the inmemdb to db
      (let ((start-time (current-milliseconds))
	    (sync-time  #f)
	    (rem-time   #f))
	(if *inmemdb* (db:sync-touched *inmemdb* force-sync: #t))

	  (begin 
	    (debug:print-info 0 "interface changed, refreshing iface and port info")
	    (set! iface (car sdat))
	    (set! port  (cadr sdat))))
      
      ;; NOTE: Get rid of this mechanism! It really is not needed...
      ;; (open-run-close tasks:server-update-heartbeat tasks:open-db spid)

      ;;
      ;; NOT USED ANY MORE
      ;;
      ;; (tasks:server-update-heartbeat tdb server-id)
      
      ;; (if ;; (or (> numrunning 0) ;; stay alive for two days after last access

      ;; 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 "last-access=" last-access ", server-timeout=" server-timeout)
      ;;
      ;; no_traffic
      ;;
      (if (and *server-run*
	       (> (+ last-access server-timeout)
		  (current-seconds)))
	  (begin
	    (debug:print-info 0 "Server continuing, seconds since last db access: " (- (current-seconds) last-access))
	    (loop 0))
	  (begin
	    (debug:print-info 0 "Starting to shutdown the server.")
	    ;; need to delete only *my* server entry (future use)
	    (set! *time-to-exit* #t)
	    (if *inmemdb* (db:sync-touched *inmemdb* force-sync: #t))
	    ;;
	    ;; start_shutdown
	    ;;
	    ( tasks:server-set-state! tdb server-id "shutting-down")
	    (thread-sleep! 5)
	    (debug:print-info 0 "Max cached queries was    " *max-cache-size*)
	    (debug:print-info 0 "Number of cached writes   " *number-of-writes*)
	    (debug:print-info 0 "Average cached write time "
			      (if (eq? *number-of-writes* 0)
				  "n/a (no writes)"

				     *number-non-write-queries*))
			      " ms")
	    (debug:print-info 0 "Server shutdown complete. Exiting")
	    (tasks:server-delete-record! tdb server-id)
	    (exit))))))

;; all routes though here end in exit ...
;;
;; start_server? 
;;
(define (http-transport:launch run-id)
  (set! *run-id*   run-id)
  (if (not *toppath*)
      (if (not (setup-for-run))
	  (begin
	    (debug:print 0 "ERROR: cannot find megatest.config, exiting")
	    (exit))))
  (debug:print-info 2 "Starting the standalone server")
  (if (args:get-arg "-daemonize")
      (daemon:ize))
  ;;
  ;; set_available
  ;;
  (let ((server-id (open-run-close tasks:server-lock-slot tasks:open-db run-id)))
    (if (not server-id)
	;;
	;; remove_dead_entry?
	;;
	(begin
	  (debug:print-info 2 "INFO: server pid=" (current-process-id) ", hostname=" (get-host-name) " not starting due to other candidates ahead in start queue")
	  (open-run-close tasks:server-delete-records-for-this-pid tasks:open-db))
	(if *toppath* 
	    (let* ((th2 (make-thread (lambda ()
				       (http-transport:run 
					(if (args:get-arg "-server")

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

;; Call this to start the actual server
;;

;; all routes though here end in exit ...
;;
;; start_server
;;
(define (server:launch transport run-id)
  (if (not *toppath*)
      (if (not (setup-for-run))
	  (begin
	    (debug:print 0 "ERROR: cannot find megatest.config, exiting")
	    (exit))))
  (debug:print-info 2 "Starting server using " transport " transport")

    (tasks:server-am-i-the-server? mdb run-id)))
	
;; register that this server may come online (first to register goes though with the process)
(define (tasks:server-set-available mdb run-id)
  (sqlite3:execute 
   mdb 
   "INSERT INTO servers (pid,hostname,port,pubport,start_time,      priority,state,mt_version,heartbeat,   interface,transport,run_id)
                   VALUES(?, ?,       ?,   ?, strftime('%s','now'), ?,       ?,    ?,-1,?,        ?,        ?);"
   (current-process-id)       ;; pid
   (get-host-name)            ;; hostname
   -1                         ;; port
   -1                         ;; pubport
   (random 1000)              ;; priority (used a tiebreaker on get-available)
   "available"                ;; state
   (common:version-signature) ;; mt_version