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;; Copyright 2006-2012, Matthew Welland.
;;
;; This program is made available under the GNU GPL version 2.0 or
;; greater. See the accompanying file COPYING for details.
;;
;; This program is distributed WITHOUT ANY WARRANTY; without even the
;; implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
;; PURPOSE.
(require-extension (srfi 18) extras tcp rpc s11n)
(import (prefix rpc rpc:))
(require-extension (srfi 18) extras tcp s11n)
;; (import (prefix rpc rpc:))
(use sqlite3 srfi-1 posix regex regex-case srfi-69 hostinfo md5 message-digest)
(import (prefix sqlite3 sqlite3:))
(use zmq)
(declare (unit server))
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;; [ ] [ ] 5. Add processing of subscription hits
;; [ ] [ ] - done when get key
;; [ ] [ ] - return results
;; [ ] [ ] 6. Add timeout processing
;; [ ] [ ] - after 60 seconds
;; [ ] [ ] i. check server alive, connect to new if necessary
;; [ ] [ ] ii. resend request
;; [ ] [ ] 7. Turn self ping back on
(define (server:make-server-url hostport)
(if (not hostport)
#f
(conc "tcp://" (car hostport) ":" (cadr hostport))))
(define *server-loop-heart-beat* (current-seconds))
(define *heartbeat-mutex* (make-mutex))
(define (server:self-ping iface port)
(let ((zsocket (server:client-connect iface port)))
(define (server:self-ping server-info)
;; server-info: server-id interface pullport pubport
(let ((iface (list-ref server-info 1))
(pullport (list-ref server-info 2))
(pubport (list-ref server-info 3)))
(server:client-connect iface pullport pubport)
(let loop ()
(thread-sleep! 2)
(cdb:client-call zsocket 'ping #t)
(debug:print 4 "server:self-ping - I'm alive on " iface ":" port "!")
(cdb:client-call *runremote* 'ping #t)
(debug:print 4 "server:self-ping - I'm alive on " iface ":" pullport "/" pubport "!")
(mutex-lock! *heartbeat-mutex*)
(set! *server-loop-heart-beat* (current-seconds))
(mutex-unlock! *heartbeat-mutex*)
(loop))))
(define-inline (zmqsock:get-pub dat)(vector-ref dat 0))
(define-inline (zmqsock:get-pull dat)(vector-ref dat 1))
(define-inline (zmqsock:set-pub! dat s)(vector-set! dat s 0))
(define-inline (zmqsock:set-pull! dat s)(vector-set! dat s 0))
(define (server:run hostn)
(debug:print 0 "Attempting to start the server ...")
(if (not *toppath*)
(if (not (setup-for-run))
(begin
(debug:print 0 "ERROR: cannot find megatest.config, cannot start server, exiting")
(exit))))
(let* ((zmq-sdat1 #f)
(zmq-sdat2 #f)
(zmq-socket1 #f)
(zmq-socket2 #f)
(pull-socket #f)
(pub-socket #f)
(p1 #f)
(p2 #f)
(zmq-sockets-dat #f)
(iface (if (string=? "-" hostn)
"*" ;; (get-host-name)
hostn))
(hostname (get-host-name))
(ipaddrstr (let ((ipstr (if (string=? "-" hostn)
(string-intersperse (map number->string (u8vector->list (hostname->ip hostname))) ".")
#f)))
(if ipstr ipstr hostname))))
(set! zmq-sockets-dat (server:setup-ports ipaddrstr (if (args:get-arg "-port")
(string->number (args:get-arg "-port"))
(+ 5000 (random 1001)))))
(set! zmq-sdat1 (car zmq-socket-dat))
(set! zmq-socket1 (car zmq-sdat1))
(set! zmq-sdat1 (car zmq-sockets-dat))
(set! pull-socket (cadr zmq-sdat1)) ;; (iface s port)
(set! p1 (caddr zmq-sdat1))
(set! zmq-sdat2 (cadr zmq-socket-dat))
(set! zmq-socket2 (car zmq-sdat2))
(set! zmq-sdat2 (cadr zmq-sockets-dat))
(set! pub-socket (cadr zmq-sdat2))
(set! p2 (caddr zmq-sdat2))
(set! *cache-on* #t)
;; (set! th1 (make-thread (lambda ()
;; (server:self-ping ipaddrstr actual-port))))
;; (thread-start! th1)
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(begin
(debug:print-info 0 "Queue not flushed, waiting ...")
(loop))))))))
;; The heavy lifting
;;
(let loop ()
(let* ((rawmsg (receive-message* zmq-socket1))
(let* ((rawmsg (receive-message* pull-socket))
(params (db:string->obj rawmsg)) ;; (with-input-from-string rawmsg (lambda ()(deserialize))))
(res #f))
(debug:print-info 12 "server=> received params=" params)
(set! res (cdb:cached-access params))
(debug:print-info 12 "server=> processed res=" res)
;; need address here
;;
(send-message zmq-socket (db:obj->string res))
(if (not *time-to-exit*)
(loop)
(begin
(open-run-close tasks:server-deregister-self tasks:open-db #f)
(db:write-cached-data)
(exit)
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(mutex-unlock! *heartbeat-mutex*)
;; The logic here is that if the server loop gets stuck blocked in working
;; we don't want to update our heartbeat
(set! pulse (- (current-seconds) server-loop-heartbeat))
(debug:print-info 2 "Heartbeat period is " pulse " seconds on " (cadr server-info) ":" (caddr server-info) ", last db access is " (- (current-seconds) *last-db-access*) " seconds ago")
(if (> pulse 15) ;; must stay less than 10 seconds
(begin
(open-run-close tasks:server-deregister tasks:open-db (cadr server-info) port: (caddr server-info))
(open-run-close tasks:server-deregister tasks:open-db (cadr server-info) pullport: (caddr server-info))
(debug:print 0 "ERROR: Heartbeat failed, committing servercide")
(exit))
(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
(if (> (+ *last-db-access*
;; (* 48 60 60) ;; 48 hrs
;; 60 ;; one minute
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" but all were in use. Please try a different port range by starting the server with parameter \" -port N\" where N is the starting port number to use"))
(exit)) ;; To exit or not? That is the question.
(let ((zmq-url (conc "tcp://" iface ":" p)))
(debug:print 0 "Trying to start server on " zmq-url)
(bind-socket s zmq-url)
(list iface s port)))))
(define (server:setup-ports ipadrstr startport)
(let* ((s1 (server:find-free-port-and-open ipadrstr #f startport 'pub))
(define (server:setup-ports ipaddrstr startport)
(let* ((s1 (server:find-free-port-and-open ipaddrstr #f startport 'pub))
(p1 (caddr s1))
(s2 (server:find-free-port-and-open ipadrstr #f (+ 1 (if p1 p1 (+ startport 1))) 'pull))
(s2 (server:find-free-port-and-open ipaddrstr #f (+ 1 (if p1 p1 (+ startport 1))) 'pull))
(p2 (caddr s2)))
(set! *runremote* #f)
(debug:print 0 "Server started on " ipaddrstr " ports " p1 " and p2")
(debug:print 0 "Server started on " ipaddrstr " ports " p1 " and " p2)
(mutex-lock! *heartbeat-mutex*)
(set! *server-info* (open-run-close tasks:server-register tasks:open-db (current-process-id) iface p 0 'live))
(set! *server-info* (open-run-close tasks:server-register tasks:open-db (current-process-id) ipaddrstr p1 p2 0 'live))
(mutex-unlock! *heartbeat-mutex*)
(list s1 s2)))
(define (server:mk-signature)
(message-digest-string (md5-primitive)
(with-output-to-string
(lambda ()
(write (list (current-directory)
(argv)))))))
(define (server:get-client-signature)
(if *my-client-signature* *my-client-signature*
(let ((sig (server:mk-signature)))
(set! *my-client-signature* sig)
*my-client-signature*)))
;;
(define (server:client-connect iface port #!key (context #f)(type 'req))
(define (server:client-socket-connect iface port #!key (context #f)(type 'req)(subscriptions '()))
(debug:print-info 3 "client-connect " iface ":" port)
(let ((connect-ok #f)
(zmq-socket (if context
(make-socket type context)
(make-socket type)))
(conurl (server:make-server-url (list iface port))))
(if (socket? zmq-socket)
(begin
;; first apply subscriptions
(for-each (lambda (subscription)
(socket-options-set! zmq-socket 'subscribe subscription))
subscriptions)
(connect-socket zmq-socket conurl)
zmq-socket)
#f)))
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exn
(begin
;; something went wrong in connecting to the server. In this scenario it is ok
;; to try again
(debug:print 0 "ERROR: Failed to open a connection to the server at: " hostinfo)
(debug:print 0 " EXCEPTION: " ((condition-property-accessor 'exn 'message) exn))
(debug:print 0 " perhaps jobs killed with -9? Removing server records")
(open-run-close tasks:server-deregister tasks:open-db host port: port)
(open-run-close tasks:server-deregister tasks:open-db host pullport: pullport)
(server:client-setup (- numtries 1))
#f)
(let* ((push-socket (server:client-connect iface pullport 'push))
(server:client-connect iface pullport pubport)))
(sub-socket (server:client-connect iface pubport 'sub))
(zmq-sockets (vector push-socket sub-socket))
(login-res #f)
;; (connect-ok
(conurl (server:make-server-url (list iface port))))
(socket-option-set! sub-socket 'subscribe (server:get-client-signature))
(set! login-res (server:client-login zmq-sockets))
(if (and (not (null? login-res))
(car login-res))
(begin
(debug:print-info 2 "Logged in and connected to " conurl)
(set! *runremote* zmq-socket)
#t)
(begin
(debug:print-info 2 "Failed to login or connect to " conurl)
(set! *runremote* #f)
#f)))))
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(debug:print-info 1 "Waiting for the server to come online before starting heartbeat")
(thread-sleep! 2)
(mutex-lock! *heartbeat-mutex*)
(set! server-info *server-info* )
(mutex-unlock! *heartbeat-mutex*)
(if (not server-info)(loop)))
(debug:print 1 "Server alive, starting self-ping")
(server:self-ping (cadr server-info)(caddr server-info)))) "Self ping"))
(server:self-ping server-info)))
"Self ping"))
(th2 (make-thread (lambda ()
(server:run (args:get-arg "-server"))) "Server run"))
(th3 (make-thread (lambda ()
(server:keep-running)) "Keep running")))
(set! *client-non-blocking-mode* #t)
(thread-start! th1)
(thread-start! th2)
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exn
(debug:print " ... 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 "ERROR: Received ^C, attempting clean exit.")
(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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