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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 s11n)
(require-extension (srfi 18) extras tcp s11n rpc)
(import (prefix rpc rpc:))
(use sqlite3 srfi-1 posix regex regex-case srfi-69 hostinfo md5 message-digest)
(import (prefix sqlite3 sqlite3:))
(use spiffy uri-common intarweb http-client spiffy-request-vars)
(tcp-buffer-size 2048)
(define (server:make-server-url hostport)
(define (rpc-transport:autoremote procstr params)
(if (not hostport)
#f
(conc "http://" (car hostport) ":" (cadr hostport))))
(define *server-loop-heart-beat* (current-seconds))
(define *heartbeat-mutex* (make-mutex))
;;======================================================================
;; S E R V E R
;;======================================================================
;; Call this to start the actual server
;; all routes though here end in exit ...
;;
;; start_server?
(define *db:process-queue-mutex* (make-mutex))
(define (server:run hostn)
(debug:print 2 "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* (;; (iface (if (string=? "-" hostn)
;; #f ;; (get-host-name)
;; hostn))
(db #f) ;; (open-db)) ;; we don't want the server to be opening and closing the db unnecesarily
(hostname (get-host-name))
(ipaddrstr (let ((ipstr (if (string=? "-" hostn)
(string-intersperse (map number->string (u8vector->list (hostname->ip hostname))) ".")
#f)))
(if ipstr ipstr hostn))) ;; hostname)))
(start-port (if (args:get-arg "-port")
(string->number (args:get-arg "-port"))
(+ 5000 (random 1001))))
(link-tree-path (config-lookup *configdat* "setup" "linktree")))
(set! *cache-on* #t)
(root-path (if link-tree-path
link-tree-path
(current-directory))) ;; WARNING: SECURITY HOLE. FIX ASAP!
;; Setup the web server and a /ctrl interface
;;
(vhost-map `(((* any) . ,(lambda (continue)
;; open the db on the first call
(if (not db)(set! db (open-db)))
(let* (($ (request-vars source: 'both))
(dat ($ 'dat))
(res #f))
(cond
((equal? (uri-path (request-uri (current-request)))
'(/ "hey"))
(send-response body: "hey there!\n"
headers: '((content-type text/plain))))
;; This is the /ctrl path where data is handed to the server and
;; responses
((equal? (uri-path (request-uri (current-request)))
'(/ "ctrl"))
(let* ((packet (db:string->obj dat))
(qtype (cdb:packet-get-qtype packet)))
(debug:print-info 12 "server=> received packet=" packet)
(if (not (member qtype '(sync ping)))
(begin
(mutex-lock! *heartbeat-mutex*)
(set! *last-db-access* (current-seconds))
(mutex-unlock! *heartbeat-mutex*)))
;; (mutex-lock! *db:process-queue-mutex*) ;; trying a mutex
;; (set! res (open-run-close db:process-queue-item open-db packet))
(set! res (db:process-queue-item db packet))
;; (mutex-unlock! *db:process-queue-mutex*)
(debug:print-info 11 "Return value from db:process-queue-item is " res)
(send-response body: (conc "<head>ctrl data</head>\n<body>"
res
"</body>")
headers: '((content-type text/plain)))))
(else (continue))))))))
(server:try-start-server ipaddrstr start-port)
;; lite3:finalize! db)))
))
;; (define (server:main-loop)
;; (print "INFO: Exectuing main server loop")
;; (access-log "megatest-http.log")
;; (server-bind-address #f)
;; (define-page (main-page-path)
;; (lambda ()
;; (let ((dat ($ "dat")))
;; ;; (with-request-variables (dat)
;; (debug:print-info 12 "Got dat=" dat)
;; (let* ((packet (db:string->obj dat))
;; (qtype (cdb:packet-get-qtype packet)))
;; (debug:print-info 12 "server=> received packet=" packet)
;; (if (not (member qtype '(sync ping)))
;; (begin
;; (mutex-lock! *heartbeat-mutex*)
;; (set! *last-db-access* (current-seconds))
;; (mutex-unlock! *heartbeat-mutex*)))
;; (let ((res (open-run-close db:process-queue-item open-db packet)))
;; (debug:print-info 11 "Return value from db:process-queue-item is " res)
;; res))))))
;;; (use spiffy uri-common intarweb)
;;;
;;; (root-path "/var/www")
;;;
;;; (vhost-map `(((* any) . ,(lambda (continue)
;;; (if (equal? (uri-path (request-uri (current-request)))
;;; '(/ "hey"))
;;; (send-response body: "hey there!\n"
;;; headers: '((content-type text/plain)))
;;; (continue))))))
;;;
;;; (start-server port: 12345)
;; This is recursively run by server:run until sucessful
;;
(define (server:try-start-server ipaddrstr portnum)
(handle-exceptions
exn
(begin
(print-error-message exn)
(if (< portnum 9000)
(begin
(print "WARNING: failed to start on portnum: " portnum ", trying next port")
(thread-sleep! 0.1)
(open-run-close tasks:remove-server-records tasks:open-db)
(server:try-start-server ipaddrstr (+ portnum 1)))
(print "ERROR: Tried and tried but could not start the server")))
(set! *runremote* (list ipaddrstr portnum))
(open-run-close tasks:remove-server-records tasks:open-db)
(open-run-close tasks:server-register
tasks:open-db
(current-process-id)
ipaddrstr portnum 0 'live)
(print "INFO: Trying to start server on " ipaddrstr ":" portnum)
;; This starts the spiffy server
(start-server port: portnum)
(print "INFO: server has been stopped")))
(define (server:mk-signature)
(message-digest-string (md5-primitive)
(with-output-to-string
(lambda ()
(write (list (current-directory)
(argv)))))))
;;======================================================================
;; S E R V E R U T I L I T I E S
;;======================================================================
;; When using zmq this would send the message back (two step process)
;; with spiffy or rpc this simply returns the return data to be returned
;;
(define (server:reply return-addr query-sig success/fail result)
(debug:print-info 11 "server:reply return-addr=" return-addr ", result=" result)
;; (send-message pubsock target send-more: #t)
;; (send-message pubsock
(db:obj->string (vector success/fail query-sig result)))
C L I E N T S
;;======================================================================
(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*)))
;; <html>
;; <head></head>
;; <body>1 Hello, world! Goodbye Dolly</body></html>
;; Send msg to serverdat and receive result
(define (server:client-send-receive serverdat msg)
(let* ((url (server:make-server-url serverdat))
(fullurl (conc url "/ctrl")) ;; (conc url "/?dat=" msg)))
(numretries 0))
(handle-exceptions
exn
(if (< numretries 200)
(server:client-send-receive serverdat msg))
(begin
(debug:print-info 11 "fullurl=" fullurl "\n")
;; set up the http-client here
(max-retry-attempts 100)
(retry-request? (lambda (request)
(thread-sleep! (/ (if (> numretries 100) 100 numretries) 10))
(set! numretries (+ numretries 1))
#t))
;; send the data and get the response
;; extract the needed info from the http data and
;; process and return it.
(let* ((res (with-input-from-request fullurl
;; #f
;; msg
(list (cons 'dat msg))
read-string)))
(debug:print-info 11 "got res=" res)
(let ((match (string-search (regexp "<body>(.*)<.body>") res)))
(debug:print-info 11 "match=" match)
(let ((final (cadr match)))
(debug:print-info 11 "final=" final)
final)))))))
(define (server:client-login serverdat)
(max-retry-attempts 100)
(cdb:login serverdat *toppath* (server:get-client-signature)))
;; Not currently used! But, I think it *should* be used!!!
(define (server:client-logout serverdat)
(let ((ok (and (socket? serverdat)
(cdb:logout serverdat *toppath* (server:get-client-signature)))))
;; (close-socket serverdat)
ok))
(define (server:client-connect iface port)
(let* ((login-res #f)
(serverdat (list iface port)))
(set! login-res (server:client-login serverdat))
(if (and (not (null? login-res))
(car login-res))
(begin
(debug:print-info 2 "Logged in and connected to " iface ":" port)
(set! *runremote* serverdat)
serverdat)
(begin
(debug:print-info 2 "Failed to login or connect to " iface ":" port)
(set! *runremote* #f)
#f))))
;; Do all the connection work, start a server if not already running
(define (server:client-setup #!key (numtries 50))
(if (not *toppath*)
(if (not (setup-for-run))
(begin
(debug:print 0 "ERROR: failed to find megatest.config, exiting")
(exit))))
(let ((hostinfo (open-run-close tasks:get-best-server tasks:open-db)))
(if hostinfo
(let ((host (list-ref hostinfo 0))
(iface (list-ref hostinfo 1))
(port (list-ref hostinfo 2))
(pid (list-ref hostinfo 3)))
(debug:print-info 2 "Setting up to connect to " hostinfo)
(server:client-connect iface port)) ;; )
(if (> numtries 0)
(let ((exe (car (argv)))
(pid #f))
(debug:print-info 0 "No server available, attempting to start one...")
(set! pid (process-run exe (list "-server" "-" "-debug" (if (list? *verbosity*)
(string-intersperse *verbosity* ",")
(conc *verbosity*)))))
;; (set! pid (process-fork (lambda ()
;; (current-input-port (open-input-file "/dev/null"))
;; (current-output-port (open-output-file "/dev/null"))
;; (current-error-port (open-output-file "/dev/null"))
;; (server:launch))))
(let loop ((count 0))
(let ((hostinfo (open-run-close tasks:get-best-server tasks:open-db)))
(if (not hostinfo)
(begin
(debug:print-info 0 "Waiting for server pid=" pid " to start")
(sleep 2) ;; give server time to start
(if (< count 5)
(loop (+ count 1)))))))
;; we are starting a server, do not try again! That can lead to
;; recursively starting many processes!!!
(server:client-setup numtries: 0))
(debug:print-info 1 "Too many attempts, giving up")))))
;; run server:keep-running in a parallel thread to monitor that the db is being
;; used and to shutdown after sometime if it is not.
;;
(define (server:keep-running)
;; 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)
;; (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)
(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)))))))
;; all routes though here end in exit ...
(define (server:launch)
(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")
(let ((hostinfo (open-run-close tasks:get-best-server tasks:open-db)))
(debug:print 11 "server:launch hostinfo=" hostinfo)
(if hostinfo
(debug:print-info 2 "NOT starting new server, one is already running on " (car hostinfo) ":" (cadr hostinfo))
(if *toppath*
(let* ((th2 (make-thread (lambda ()
(server:run
(if (args:get-arg "-server")
(args:get-arg "-server")
"-"))) "Server run"))
(th3 (make-thread (lambda ()(server:keep-running)) "Keep running"))
)
(thread-start! th2)
(thread-start! th3)
(set! *didsomething* #t)
(thread-join! th2)
)
(debug:print 0 "ERROR: Failed to setup for megatest")))
(exit)))
(define (server:client-signal-handler signum)
(debug:print " ... exiting ...")
(let ((th1 (make-thread (lambda ()
"") ;; do nothing for now (was 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! 1) ;; give the flush one second to do it's stuff
(debug:print 0 " Done.")
(exit 4))
"exit on ^C timer")))
(thread-start! th2)
(thread-start! th1)
(thread-join! th2))))
(define (server:client-launch)
(set-signal-handler! signal/int server:client-signal-handler)
(if (server:client-setup)
(debug:print-info 2 "connected as client")
(begin
(debug:print 0 "ERROR: Failed to connect as client")
(exit))))
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