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(define *heartbeat-mutex* (make-mutex))
;;======================================================================
;; S E R V E R
;;======================================================================
(define (nmsg-transport:run dbstruct hostn run-id server-id #!key (retrynum 1000))
(debug:print 2 #f "Attempting to start the server ...")
(debug:print 2 *default-log-port* "Attempting to start the server ...")
(let* ((start-port (portlogger:open-run-close portlogger:find-port))
(server-thread (make-thread (lambda ()
(nmsg-transport:try-start-server dbstruct run-id start-port server-id))
"server thread"))
(tdbdat (tasks:open-db)))
(thread-start! server-thread)
(thread-sleep! 0.1)
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(tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "running")
(thread-start! (make-thread
(lambda ()(nmsg-transport:keep-running server-id run-id))
"keep running"))
(thread-join! server-thread))
(if (> retrynum 0)
(begin
(debug:print 0 #f "WARNING: Failed to connect to server (self) on host " hostn ":" start-port ", trying again.")
(debug:print 0 *default-log-port* "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))
(begin
(debug:print 0 #f "ERROR: could not find an open port to start server on. Giving up")
(debug:print 0 *default-log-port* "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 #f "server, received: " dat)
(debug:print 0 *default-log-port* "server, received: " dat)
(let ((result (api:execute-requests dbstruct dat)))
(debug:print 0 #f "server, sending: " result)
(debug:print 0 *default-log-port* "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))
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;; (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)
(begin
(debug:print-info 0 #f "Server for run-id " run-id " already running")
(debug:print-info 0 *default-log-port* "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))
(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)
(- remtries 1))
(begin
(debug:print-info 0 #f "Another server took the slot, exiting")
(debug:print-info 0 *default-log-port* "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 #f "INFO: server pid=" (current-process-id) ", hostname=" (get-host-name) " not starting due to other candidates ahead in start queue")
(debug:print-info 2 *default-log-port* "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")
))
;; locked in a server id, try to start up
(nmsg-transport:run dbstruct hostn run-id server-id))
(set! *didsomething* #t)
(exit))))
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(dat (vector "ping" our-key))
(result (condition-case
(nmsg-transport:client-api-send-receive-raw req dat timeout: timeout)
((timeout)(set! success #f) #f)))
(key (if success
(vector-ref result 1)
#f)))
(debug:print 0 #f "success=" success ", key=" key ", expected-key=" expected-key ", equal? " (equal? key expected-key))
(debug:print 0 *default-log-port* "success=" success ", key=" key ", expected-key=" expected-key ", equal? " (equal? key expected-key))
(if (and success
(or (not expected-key) ;; just getting a reply is good enough then
(equal? key expected-key)))
(if return-socket
req
(begin
(if (not socket)(nn-close req)) ;; don't want a side effect of closing socket if handed it
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(set! success #t)
(set! result (db:string->obj res transport: 'nmsg))))
"send-recv"))
(timeout (make-thread
(lambda ()
(let loop ((count 0))
(thread-sleep! 1)
(debug:print-info 1 #f "send-receive-raw, still waiting after " count " seconds...")
(debug:print-info 1 *default-log-port* "send-receive-raw, still waiting after " count " seconds...")
(if (and keepwaiting (< count timeout)) ;; yes, this is very aproximate
(loop (+ count 1))))
(if keepwaiting
(begin
(print "timeout waiting for ping")
(thread-terminate! send-recv))))
"timeout")))
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(if success (thread-terminate! timeout)))
;; raise timeout error if timed out
(if success
(if (and (vector? result)
(vector-ref result 0)) ;; did it fail at the server?
result ;; nope, all good
(begin
(debug:print 0 #f "ERROR: error occured at server, info=" (vector-ref result 2))
(debug:print 0 #f " client call chain:")
(debug:print 0 *default-log-port* "ERROR: error occured at server, info=" (vector-ref result 2))
(debug:print 0 *default-log-port* " client call chain:")
(print-call-chain (current-error-port))
(debug:print 0 #f " server call chain:")
(debug:print 0 *default-log-port* " server call chain:")
(pp (vector-ref result 1) (current-error-port))
(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)
;; 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 #f "keep-running got sdat=" sdat)
(debug:print-info 0 *default-log-port* "keep-running got sdat=" sdat)
sdat)
(begin
(thread-sleep! 0.5)
(loop))))))
(iface (car server-info))
(port (cadr server-info))
(last-access 0)
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(set! last-access *last-db-access*)
(mutex-unlock! *heartbeat-mutex*)
(db:sync-touched *inmemdb* run-id force-sync: #t)
(if (and *server-run*
(> (+ last-access server-timeout)
(current-seconds)))
(begin
(debug:print-info 0 #f "Server continuing, seconds since last db access: " (- (current-seconds) last-access))
(debug:print-info 0 *default-log-port* "Server continuing, seconds since last db access: " (- (current-seconds) last-access))
(loop 0))
(begin
(debug:print-info 0 #f "Starting to shutdown the server.")
(debug:print-info 0 *default-log-port* "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")
(debug:print-info 0 #f "Server shutdown complete. Exiting")
(debug:print-info 0 *default-log-port* "Server shutdown complete. Exiting")
(exit)
))))))
;;======================================================================
;; C L I E N T S
;;======================================================================
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;;======================================================================
;; DO NOT USE
;;
(define (nmsg-transport:client-signal-handler signum)
(handle-exceptions
exn
(debug:print 0 #f " ... exiting ...")
(debug:print 0 *default-log-port* " ... exiting ...")
(let ((th1 (make-thread (lambda ()
(if (not *received-response*)
(receive-message* *runremote*))) ;; flush out last call if applicable
"eat response"))
(th2 (make-thread (lambda ()
(debug:print 0 #f "ERROR: Received ^C, attempting clean exit. Please be patient and wait a few seconds before hitting ^C again.")
(debug:print 0 *default-log-port* "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 #f " Done.")
(debug:print 0 *default-log-port* " Done.")
(exit 4))
"exit on ^C timer")))
(thread-start! th2)
(thread-start! th1)
(thread-join! th2))))
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