;; 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:))
(use sqlite3 srfi-1 posix regex regex-case srfi-69 hostinfo zmq md5 message-digest)
(import (prefix sqlite3 sqlite3:))
(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 "tcp://" (car hostport) ":" (cadr hostport))))
(define *time-to-exit* #f)
(define (server:run hostn)
(debug:print 0 "Attempting to start the server ...")
(if (not *toppath*)(setup-for-run))
(let* ((zmq-socket #f)
(hostname (if (string=? "-" hostn)
(get-host-name)
hostn))
(ipaddrstr (let ((ipstr (if (string=? "-" hostn)
(string-intersperse (map number->string (u8vector->list (hostname->ip hostname))) ".")
#f)))
(if ipstr ipstr hostname))))
(set! zmq-socket (server:find-free-port-and-open ipaddrstr zmq-socket 5555 0))
(set! *cache-on* #t)
;; what to do when we quit
;;
(on-exit (lambda ()
(open-run-close tasks:server-deregister-self tasks:open-db)
(let loop ()
(let ((queue-len 0))
(thread-sleep! (random 5))
(mutex-lock! *incoming-mutex*)
(set! queue-len (length *incoming-data*))
(mutex-unlock! *incoming-mutex*)
(if (> queue-len 0)
(begin
(debug:print-info 0 "Queue not flushed, waiting ...")
(loop)))))))
;; The heavy lifting
;;
(let loop ()
(let* ((rawmsg (receive-message* zmq-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)
(send-message zmq-socket (db:obj->string res))
(if (not *time-to-exit*)
(loop)
(begin
(db:write-cached-data)
(open-run-close tasks:server-deregister-self tasks:open-db)
(exit)
))))))
;; 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
(let loop ((count 0))
(thread-sleep! 1) ;; no need to do this very often
(db:write-cached-data)
;; (print "Server running, count is " count)
(if (< count 10)
(loop (+ count 1))
(let ((numrunning (open-run-close db:get-count-tests-running #f)))
(if (or (> numrunning 0)
(> (+ *last-db-access* 60)(current-seconds)))
(begin
(debug:print-info 0 "Server continuing, tests running: " numrunning ", seconds since last db access: " (- (current-seconds) *last-db-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)
(thread-sleep! 5)
(debug:print-info 0 "Max cached queries was " *max-cache-size*)
(debug:print-info 0 "Server shutdown complete. Exiting")
(exit))))))
(define (server:find-free-port-and-open host s port #!key (trynum 50))
(let ((s (if s s (make-socket 'rep)))
(p (if (number? port) port 5555)))
(handle-exceptions
exn
(begin
(debug:print 0 "Failed to bind to port " p ", trying next port")
(debug:print 0 " EXCEPTION: " ((condition-property-accessor 'exn 'message) exn))
(if (> trynum 0)
(server:find-free-port-and-open host s (+ p 1) trynum: (- trynum 1))
(debug:print-info 0 "Tried ports from " (- p trynum) " to " p
" 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")))
(let ((zmq-url (conc "tcp://" host ":" p)))
(print "Trying to start server on " zmq-url)
(bind-socket s zmq-url)
(set! *runremote* #f)
(debug:print 0 "Server started on " zmq-url)
(open-run-close tasks:server-register tasks:open-db (current-process-id) host p 0 'live)
s))))
(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 host port)
(debug:print 3 "client-connect " host ":" port)
(let ((connect-ok #f)
(zmq-socket (make-socket 'req))
(conurl (server:make-server-url (list host port))))
(if (socket? zmq-socket)
(begin
(connect-socket zmq-socket conurl)
zmq-socket)
#f)))
(define (server:client-login zmq-socket)
(cdb:login zmq-socket *toppath* (server:get-client-signature)))
(define (server:client-logout zmq-socket)
(let ((ok (and (socket? zmq-socket)
(cdb:logout zmq-socket *toppath* (server:get-client-signature)))))
;; (close-socket zmq-socket)
ok))
;; Do all the connection work, start a server if not already running
(define (server:client-setup #!key (numtries 10))
(if (not *toppath*)(setup-for-run))
(let ((hostinfo (open-run-close tasks:get-best-server tasks:open-db)))
(if hostinfo
(let* ((host (car hostinfo))
(port (cadr hostinfo)))
(debug:print-info 2 "Setting up to connect to " hostinfo)
(handle-exceptions
exn
(begin
(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)
#f)
(let* ((zmq-socket (server:client-connect host port))
(login-res (server:client-login zmq-socket))
(connect-ok (if (null? login-res) #f (car login-res)))
(conurl (server:make-server-url hostinfo)))
(if connect-ok
(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)))))
(if (> numtries 0)
(let ((exe (car (argv))))
(debug:print-info 1 "No server available, attempting to start one...")
(process-run exe (list "-server" "-" "-debug" (conc *verbosity*)))
;; (system (conc " -server - " (if (args:get-arg "-debug")
;; (conc "-debug " (args:get-arg "-debug"))
;; "")
;; " &"))
(sleep 10)
(server:client-setup numtries: (- numtries 1)))
(debug:print-info 1 "Too many retries, giving up")))))
(define (server:launch)
(let* ((toppath (setup-for-run)))
(debug:print-info 0 "Starting the standalone server")
(let ((hostinfo (open-run-close tasks:get-best-server tasks:open-db)))
(if hostinfo
(debug:print-info 1 "NOT starting new server, one is already running on " (car hostinfo) ":" (cadr hostinfo))
(if *toppath*
(let* ((th2 (make-thread (lambda ()
(server:run (args:get-arg "-server")))))
(th3 (make-thread (lambda ()
(server:keep-running)))))
(thread-start! th2)
(thread-start! th3)
(set! *didsomething* #t)
(thread-join! th3))
(debug:print 0 "ERROR: Failed to setup for megatest"))))))
(define (server:client-launch)
(if (server:client-setup)
(debug:print-info 0 "connected as client")
(begin
(debug:print 0 "ERROR: Failed to connect as client")
(exit))))
;; ping a server and return number of clients or #f (if no response)
(define (server:ping host port #!key (secs 10))
(cdb:use-non-blocking-mode
(lambda ()
(let* ((res #f)
(th1 (make-thread
(lambda ()
(let ((zmq-socket (server:client-connect host port)))
(if zmq-socket
(if (server:client-login zmq-socket)
(let ((numclients (cdb:num-clients zmq-socket)))
(server:client-logout zmq-socket)
(close-socket zmq-socket)
(set! res (list #t numclients)))
(begin
;; (close-socket zmq-socket)
(set! res (list #f "CAN'T LOGIN"))))
(set! res (list #f "CAN'T CONNECT")))))))
(th2 (make-thread
(lambda ()
(let loop ((count 1))
(debug:print-info 1 "Ping " count " server on " host " at port " port)
(thread-sleep! 2)
(if (< count (/ secs 2))
(loop (+ count 1))))
;; (thread-terminate! th1)
(set! res (list #f "TIMED OUT"))))))
(thread-start! th2)
(thread-start! th1)
(handle-exceptions
exn
(set! res (list #f "TIMED OUT"))
(thread-join! th1 secs))
res))))