;; 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)
(import (prefix sqlite3 sqlite3:))
(declare (unit server))
(declare (uses common))
(declare (uses db))
(declare (uses tests))
(include "common_records.scm")
(include "db_records.scm")
(define (server:run hostn)
(debug:print 0 "Attempting to start the server ...")
(let ((host:port (open-run-close db:get-var #f "SERVER"))) ;; do whe already have a server running?
(if host:port
(begin
(debug:print 0 "ERROR: server already running.")
(if (server:client-setup)
(begin
(debug:print-info 0 "Server is alive, exiting")
(exit))
(begin
(debug:print-info 0 "Server is dead, removing flag and trying again")
(open-run-close db:del-var #f "SERVER")
(server:run hostn))))
(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))
(set! *cache-on* #t)
;; what to do when we quit
;;
(on-exit (lambda ()
(open-run-close db:del-var #f "SERVER")
(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))
(loop)))))))
;; 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 db)
;; if none running or if > 20 seconds since
;; server last used then start shutdown
(let loop ()
(thread-sleep! 20) ;; no need to do this very often
(let ((numrunning (db:get-count-tests-running db)))
(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))
(begin
(debug:print-info 0 "Starting to shutdown the server side")
;; need to delete only *my* server entry (future use)
(db:del-var db "SERVER")
(thread-sleep! 10)
(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)
(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))
(server:find-free-port-and-open host s (+ p 1)))
(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 db:set-var #f "SERVER" zmq-url)
s))))
(define (server:client-setup)
(let* ((hostinfo (open-run-close db:get-var #f "SERVER"))
(zmq-socket (make-socket 'req)))
(if hostinfo
(begin
(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 db:del-var #f "SERVER")
(exit)
#f)
(let ((connect-ok #f))
(connect-socket zmq-socket hostinfo)
(set! connect-ok (cdb:client-call zmq-socket 'login #t *toppath*))
(if connect-ok
(begin
(debug:print-info 2 "Logged in and connected to " hostinfo)
(set! *runremote* zmq-socket)
#t)
(begin
(debug:print-info 2 "Failed to login or connect to " hostinfo)
(set! *runremote* #f)
#f)))))
(begin
(debug:print-info 2 "No server available, attempting to start one...")
(system (conc "megatest -server - " (if (args:get-arg "-debug")
(conc "-debug " (args:get-arg "-debug"))
"")
" &"))
(sleep 5)
(server:client-setup)))))