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(debug:print 2 "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)
(if (nmsg-transport:ping hostn start-port)
(begin
(tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "dbprep")
(set! *server-info* (list hostn start-port)) ;; probably not needed anymore?
(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")
(thread-start! nmsg-transport:keep-running)
(thread-join! server-thread))
(begin
(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)))))
(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)))
(cond
((equal? msg-in "quit")
(nn-send repsoc "Ok, quitting"))
((and (>= (string-length msg-in) 4)
(equal? (substring msg-in 0 4) "ping"))
(nn-send repsoc (conc (current-process-id)))
(loop (nn-recv repsoc)))
(else
(let* ((dat (db:string->obj msg-in transport: 'nm))
(cmd (vector-ref dat 0))
(params (vector-ref dat 1))
(result (api:execute-requests dbstruct cmd params))
(newdat (db:obj->string result transport: 'nm)))
(nn-send repsoc newdat)
(loop (nn-recv repsoc))))))))
;; 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)
;; 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 sdat
(begin
(debug:print 12 "WARNING: server not started yet, waiting few seconds before trying again")
(sleep 4)
(loop))))))
(iface (cadr server-info))
(pullport (caddr server-info))
(pubport (cadddr server-info)) ;; id interface pullport pubport)
;; (nmsg-sockets (nmsg-transport:client-connect iface pullport pubport))
(last-access 0))
(debug:print-info 11 "heartbeat started for nmsg server on " iface " " pullport " " pubport)
(let loop ((count 0))
(thread-sleep! 4) ;; no need to do this very often
;; NB// sync currently does NOT return queue-length
;; GET REAL QUEUE LENGTH FROM THE VARIABLE
(let ((queue-len 0)) ;; FOR NOW DO NOT DO THIS (cdb:client-call nmsg-sockets 'sync #t 1)))
;; (print "Server running, count is " count)
(if (< count 1) ;; 3x3 = 9 secs aprox
(loop (+ count 1)))
;; NOTE: Get rid of this mechanism! It really is not needed...
;; (open-run-close tasks:server-update-heartbeat tasks:open-db (car server-info))
;; (if ;; (or (> numrunning 0) ;; stay alive for two days after last access
(mutex-lock! *heartbeat-mutex*)
(set! last-access *last-db-access*)
(mutex-unlock! *heartbeat-mutex*)
(if (> (+ last-access
;; (* 50 60 60) ;; 48 hrs
;; 60 ;; one minute
;; (* 60 60) ;; one hour
(* 45 60) ;; 45 minutes, until the db deletion bug is fixed.
)
(current-seconds))
(begin
(debug:print-info 2 "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)
(open-run-close tasks:server-deregister-self tasks:open-db (get-host-name))
(thread-sleep! 1)
(debug:print-info 0 "Max cached queries was " *max-cache-size*)
(debug:print-info 0 "Server shutdown complete. Exiting")
(exit)))))))
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(debug:print 2 "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)
(if (nmsg-transport:ping hostn start-port timeout: 2 expected-key: (current-process-id))
(begin
(tasks:server-set-state! (db:delay-if-busy tdbdat) 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")
(thread-start! (make-thread
(lambda ()(nmsg-transport:keep-running server-id))
"keep running"))
(thread-join! server-thread))
(begin
(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)))))
(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)))
(cond
((equal? msg-in "quit")
(nn-send repsoc "Ok, quitting"))
((and (>= (string-length msg-in) 4)
(equal? (substring msg-in 0 4) "ping"))
(nn-send repsoc (conc (current-process-id)))
(loop (nn-recv repsoc)))
(else
(let* ((dat (db:string->obj msg-in transport: 'nmsg))
(cmd (vector-ref dat 0))
(params (vector-ref dat 1))
(result (api:execute-requests dbstruct cmd params))
(newdat (db:obj->string result transport: 'nmsg)))
(nn-send repsoc newdat)
(loop (nn-recv repsoc))))))))
;; all routes though here end in exit ...
;;
(define (nmsg-transport:launch run-id)
(let* ((tdbdat (tasks:open-db))
(dbstruct (db:setup run-id))
(hostn (or (args:get-arg "-server") "-")))
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;;======================================================================
;; ping the server at host:port
;; return the open socket if successful (return-socket == #t)
;; expect the key expected-key returned in payload
;; send our-key or #f as payload
;;
(define (nmsg-transport:ping hostn port #!key (return-socket #t)(expected-key #f)(our-key #f))
;; send a random number along with pid and check that we get it back
(let* ((req (nn-socket 'req))
(host (if (or (not hostn)
(equal? hostn "-")) ;; use localhost
(get-host-name)
hostn))
(success #f)
(keepwaiting #t)
(dat (db:obj->string (vector "ping" our-key) transport: 'nm))
(ping (make-thread
(lambda ()
(nn-send req dat)
(let* ((result (nn-recv req))
(key (vector-ref (db:string->obj result transport: 'nm) 1)))
(if (or (not expect-key) ;; just getting a reply is good enough then
(equal? (conc (current-process-id)) expected-key))
(begin
;; (print "ping, success: received \"" result "\"")
(set! success #t))
(begin
;; (print "ping, failed: received key \"" result "\"")
(set! keepwaiting #f)
(set! success #f)))))
"ping"))
(timeout (make-thread (lambda ()
(let loop ((count 0))
(thread-sleep! 1)
(print "still waiting after count seconds...")
(if (and keepwaiting (< count 10))
(loop (+ count 1))))
(if keepwaiting
(begin
(print "timeout waiting for ping")
(thread-terminate! ping))))
"timeout")))
(nn-connect req (conc "tcp://" host ":" port))
(handle-exceptions
exn
(begin
(print-call-chain)
(print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
(print "exn=" (condition->list exn))
(print "ping failed to connect to " host ":" port))
(thread-start! timeout)
(thread-start! ping)
(thread-join! ping)
(if success (thread-terminate! timeout)))
(if return-socket
(if success req #f)
(begin
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;;======================================================================
;; ping the server at host:port
;; return the open socket if successful (return-socket == #t)
;; expect the key expected-key returned in payload
;; send our-key or #f as payload
;;
(define (nmsg-transport:ping hostn port #!key (timeout 3)(return-socket #t)(expected-key #f)(our-key #f))
;; send a random number along with pid and check that we get it back
(let* ((req (nn-socket 'req))
(host (if (or (not hostn)
(equal? hostn "-")) ;; use localhost
(get-host-name)
hostn))
(success #f)
(keepwaiting #t)
(dat (db:obj->string (vector "ping" our-key) transport: 'nmsg))
(ping (make-thread
(lambda ()
(nn-send req dat)
(let* ((result (nn-recv req))
(key (vector-ref (db:string->obj result transport: 'nmsg) 1)))
(if (or (not expected-key) ;; just getting a reply is good enough then
(equal? key expected-key))
(begin
;; (print "ping, success: received \"" result "\"")
(set! success #t))
(begin
;; (print "ping, failed: received key \"" result "\"")
(set! keepwaiting #f)
(set! success #f)))))
"ping"))
(timeout (make-thread (lambda ()
(let loop ((count 0))
(thread-sleep! 1)
(print "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! ping))))
"timeout")))
(nn-connect req (conc "tcp://" host ":" port))
(handle-exceptions
exn
(begin
;; (print-call-chain)
;; (print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
;; (print "exn=" (condition->list exn))
(debug:print-info 1 "ping failed to connect to " host ":" port))
(thread-start! timeout)
(thread-start! ping)
(thread-join! ping)
(if success (thread-terminate! timeout)))
(if return-socket
(if success req #f)
(begin
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(debug:print-info 2 "Failed to login or connect to " conurl)
(set! *runremote* #f)
#f))))
;; 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)
;; 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 *runremote*)
(mutex-unlock! *heartbeat-mutex*)
(if sdat sdat
(begin
(sleep 4)
(loop))))))
(iface (car server-info))
(port (cadr server-info))
(last-access 0)
(tdb (tasks:open-db))
(spid (tasks:server-get-server-id tdb #f iface port #f)))
(print "Keep-running got server pid " spid ", using iface " iface " and port " port)
(let loop ((count 0))
(thread-sleep! 4) ;; no need to do this very often
;; NB// sync currently does NOT return queue-length
(let () ;; (queue-len (cdb:client-call server-info 'sync #t 1)))
;; (print "Server running, count is " count)
(if (< count 1) ;; 3x3 = 9 secs aprox
(loop (+ count 1)))
;; NOTE: Get rid of this mechanism! It really is not needed...
(tasks:server-update-heartbeat tdb spid)
(debug:print-info 2 "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)
(tasks:server-deregister-self tdb (get-host-name))
(thread-sleep! 1)
(debug:print-info 0 "Max cached queries was " *max-cache-size*)
(debug:print-info 0 "Server shutdown complete. Exiting")
(exit)))))))
(define (nmsg-transport:client-signal-handler signum)
(handle-exceptions
exn
(debug:print " ... exiting ...")
(let ((th1 (make-thread (lambda ()
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(debug:print-info 2 "Failed to login or connect to " conurl)
(set! *runremote* #f)
#f))))
;; 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)
;; 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)))
(print "Keep-running got server pid " server-id ", using iface " iface " and port " port)
(let loop ((count 0))
(thread-sleep! 4) ;; no need to do this very often
;; NB// sync currently does NOT return queue-length
(let () ;; (queue-len (cdb:client-call server-info 'sync #t 1)))
;; (print "Server running, count is " count)
(if (< count 1) ;; 3x3 = 9 secs aprox
(loop (+ count 1)))
;; (if ;; (or (> numrunning 0) ;; stay alive for two days after last access
(mutex-lock! *heartbeat-mutex*)
(set! last-access *last-db-access*)
(mutex-unlock! *heartbeat-mutex*)
(if (> (+ last-access
;; (* 50 60 60) ;; 48 hrs
;; 60 ;; one minute
;; (* 60 60) ;; one hour
(* 45 60) ;; 45 minutes, until the db deletion bug is fixed.
)
(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.")
(set! *time-to-exit* #t)
(tasks:server-delete-record (db:delay-if-busy tdbdat) server-id " http-transport:keep-running")
(debug:print-info 0 "Server shutdown complete. Exiting")
;; (exit)
))))))
(define (nmsg-transport:client-signal-handler signum)
(handle-exceptions
exn
(debug:print " ... exiting ...")
(let ((th1 (make-thread (lambda ()
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