;; 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)
(use sqlite3 srfi-1 posix regex regex-case srfi-69 hostinfo md5 message-digest)
(import (prefix sqlite3 sqlite3:))
(use spiffy awful http-client)
(tcp-buffer-size 2048)
(declare (unit server))
(declare (uses common))
(declare (uses db))
(declare (uses tests))
(declare (uses tasks)) ;; tasks are where stuff is maintained about what is running.
(include "common_records.scm")
(include "db_records.scm")
(define (server:make-server-url hostport)
(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
;;
(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))
(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)))))
(set! *cache-on* #t)
(server:try-start-server ipaddrstr start-port)))
(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 ()
(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*)))
(open-run-close db:process-queue-item open-db packet))))))
;; 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)
(awful-start server:main-loop port: portnum) ;; ip-address: ipaddrstr
(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
;;======================================================================
(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 "/?dat=" msg)))
(debug:print-info 11 "fullurl=" fullurl "\n")
(let* ((res (with-input-from-request fullurl #f 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)
(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)
;; 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)
(spid (open-run-close tasks:server-get-server-id tasks:open-db #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...
(open-run-close tasks:server-update-heartbeat tasks:open-db 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)
(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)))))))
;; 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)))
(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)
(handle-exceptions
exn
(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))))