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(define *server-loop-heart-beat* (current-seconds))
(define *heartbeat-mutex* (make-mutex))
;;======================================================================
;; S E R V E R
;;======================================================================
(define (nmsg-transport:run dbstruct hostn run-id server-id #!key (retrynum 1000))
(define (nmsg-transport:run dbstruct area-dat hostn run-id server-id #!key (retrynum 1000))
(debug:print 2 "Attempting to start the server ...")
(let* ((start-port (portlogger:open-run-close portlogger:find-port))
(let* ((start-port (portlogger:open-run-close portlogger:find-port area-dat))
(server-thread (make-thread (lambda ()
(nmsg-transport:try-start-server dbstruct run-id start-port server-id))
"server thread"))
(tdbdat (tasks:open-db)))
(tdbdat (tasks:open-db area-dat)))
(thread-start! server-thread)
(thread-sleep! 0.1)
(if (nmsg-transport:ping hostn start-port timeout: 2 expected-key: (current-process-id))
(let ((interface (if (equal? hostn "-")(get-host-name) hostn)))
(tasks:server-set-interface-port (db:delay-if-busy tdbdat) server-id interface start-port)
(tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "dbprep")
(tasks:server-set-interface-port (db:delay-if-busy tdbdat area-dat) server-id interface start-port)
(tasks:server-set-state! (db:delay-if-busy tdbdat area-dat) server-id "dbprep")
(set! *server-info* (list hostn start-port)) ;; probably not needed anymore? currently used by keep-running
(thread-sleep! 3) ;; give some margin for queries to complete before switching from file based access to server based access
;; (set! *inmemdb* dbstruct)
(tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "running")
(tasks:server-set-state! (db:delay-if-busy tdbdat area-dat) server-id "running")
(thread-start! (make-thread
(lambda ()(nmsg-transport:keep-running server-id run-id))
(lambda ()(nmsg-transport:keep-running server-id run-id area-dat))
"keep running"))
(thread-join! server-thread))
(if (> retrynum 0)
(begin
(debug:print 0 "WARNING: Failed to connect to server (self) on host " hostn ":" start-port ", trying again.")
(tasks:server-delete-record (db:delay-if-busy tdbdat) server-id "failed to start, never received server alive signature")
(portlogger:open-run-close portlogger:set-failed start-port)
(nmsg-transport:run dbstruct hostn run-id server-id))
(tasks:server-delete-record (db:delay-if-busy tdbdat area-dat) server-id "failed to start, never received server alive signature")
(portlogger:open-run-close portlogger:set-failed area-dat start-port)
(nmsg-transport:run dbstruct area-dat hostn run-id server-id))
(begin
(debug:print 0 "ERROR: could not find an open port to start server on. Giving up")
(exit 1))))))
(define (nmsg-transport:try-start-server dbstruct run-id portnum server-id)
(let ((repsoc (nn-socket 'rep)))
(nn-bind repsoc (conc "tcp://*:" portnum))
(let loop ((msg-in (nn-recv repsoc)))
(let* ((dat (db:string->obj msg-in transport: 'nmsg)))
(debug:print 0 "server, received: " dat)
(let ((result (api:execute-requests dbstruct dat)))
(debug:print 0 "server, sending: " result)
(nn-send repsoc (db:obj->string result transport: 'nmsg)))
(loop (nn-recv repsoc))))))
;; all routes though here end in exit ...
;;
(define (nmsg-transport:launch run-id)
(let* ((tdbdat (tasks:open-db))
(define (nmsg-transport:launch run-id area-dat)
(let* ((tdbdat (tasks:open-db area-dat))
(dbstruct (db:setup run-id))
(hostn (or (args:get-arg "-server") "-")))
(set! *run-id* run-id)
(set! *inmemdb* dbstruct)
;; with nbfake daemonize isn't really needed
;;
;; (if (args:get-arg "-daemonize")
;; (begin
;; (daemon:ize)
;; (if *alt-log-file* ;; we should re-connect to this port, I think daemon:ize disrupts it
;; (begin
;; (current-error-port *alt-log-file*)
;; (current-output-port *alt-log-file*)))))
(if (server:check-if-running run-id)
(if (server:check-if-running run-id area-dat)
(begin
(debug:print-info 0 "Server for run-id " run-id " already running")
(exit 0)))
(let loop ((server-id (tasks:server-lock-slot (db:delay-if-busy tdbdat) run-id))
(let loop ((server-id (tasks:server-lock-slot (db:delay-if-busy tdbdat area-dat) run-id))
(remtries 4))
(if (not server-id)
(if (> remtries 0)
(begin
(thread-sleep! 2)
(if (not (server:check-if-running run-id))
(loop (tasks:server-lock-slot (db:delay-if-busy tdbdat) run-id)
(if (not (server:check-if-running run-id area-dat))
(loop (tasks:server-lock-slot (db:delay-if-busy tdbdat area-dat) run-id)
(- remtries 1))
(begin
(debug:print-info 0 "Another server took the slot, exiting")
(exit 0))))
(begin
;; since we didn't get the server lock we are going to clean up and bail out
(debug:print-info 2 "INFO: server pid=" (current-process-id) ", hostname=" (get-host-name) " not starting due to other candidates ahead in start queue")
(tasks:server-delete-records-for-this-pid (db:delay-if-busy tdbdat) " http-transport:launch")
(tasks:server-delete-records-for-this-pid (db:delay-if-busy tdbdat area-dat) " http-transport:launch")
))
;; locked in a server id, try to start up
(nmsg-transport:run dbstruct hostn run-id server-id))
(nmsg-transport:run dbstruct area-dat hostn run-id server-id))
(set! *didsomething* #t)
(exit))))
;;======================================================================
;; S E R V E R U T I L I T I E S
;;======================================================================
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(signal (vector-ref result 0))))
(signal (make-composite-condition
(make-property-condition 'timeout 'message "nmsg-transport:client-api-send-receive-raw timed out talking to server"))))))
;; run nmsg-transport:keep-running in a parallel thread to monitor that the db is being
;; used and to shutdown after sometime if it is not.
;;
(define (nmsg-transport:keep-running server-id run-id)
(define (nmsg-transport:keep-running server-id run-id area-dat)
;; if none running or if > 20 seconds since
;; server last used then start shutdown
;; This thread waits for the server to come alive
(let* ((server-info (let loop ()
(let ((sdat #f))
(mutex-lock! *heartbeat-mutex*)
(set! sdat *server-info*)
(mutex-unlock! *heartbeat-mutex*)
(if sdat
(begin
(debug:print-info 0 "keep-running got sdat=" sdat)
sdat)
(begin
(thread-sleep! 0.5)
(loop))))))
(iface (car server-info))
(port (cadr server-info))
(last-access 0)
(tdbdat (tasks:open-db))
(server-timeout (let ((tmo (configf:lookup *configdat* "server" "timeout")))
(tdbdat (tasks:open-db area-dat))
(server-timeout (let ((tmo (configf:lookup (megatest:area-configdat area-dat) "server" "timeout")))
(if (and (string? tmo)
(string->number tmo))
(* 60 60 (string->number tmo))
;; (* 3 24 60 60) ;; default to three days
(* 60 1) ;; default to one minute
;; (* 60 60 25) ;; default to 25 hours
))))
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(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.")
(set! *time-to-exit* #t)
(db:sync-touched *inmemdb* run-id force-sync: #t)
(tasks:server-delete-record (db:delay-if-busy tdbdat) server-id " http-transport:keep-running")
(tasks:server-delete-record (db:delay-if-busy tdbdat area-dat) server-id " http-transport:keep-running")
(debug:print-info 0 "Server shutdown complete. Exiting")
(exit)
))))))
;;======================================================================
;; C L I E N T S
;;======================================================================
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;;
(define (nmsg-transport:client-signal-handler signum)
(handle-exceptions
exn
(debug:print " ... exiting ...")
(let ((th1 (make-thread (lambda ()
(if (not *received-response*)
(receive-message* *runremote*))) ;; flush out last call if applicable
(receive-message* (common:get-remote remote #f)))) ;; flush out last call if applicable
"eat response"))
(th2 (make-thread (lambda ()
(debug:print 0 "ERROR: Received ^C, attempting clean exit. Please be patient and wait a few seconds before hitting ^C again.")
(thread-sleep! 3) ;; give the flush three seconds to do it's stuff
(debug:print 0 " Done.")
(exit 4))
"exit on ^C timer")))
(thread-start! th2)
(thread-start! th1)
(thread-join! th2))))
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