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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)
(use srfi-1 posix regex regex-case srfi-69 hostinfo md5 message-digest)
;; (use zmq)
(use spiffy uri-common intarweb http-client spiffy-request-vars)
(declare (unit server))
(declare (uses common))
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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)
(use srfi-1 posix regex regex-case srfi-69 hostinfo md5 message-digest directory-utils)
;; (use zmq)
(use spiffy uri-common intarweb http-client spiffy-request-vars)
(declare (unit server))
(declare (uses common))
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;; S E R V E R
;;======================================================================
;; Call this to start the actual server
;;
;; all routes though here end in exit ...
(define (server:launch transport)
(if (not *toppath*)
(if (not (setup-for-run))
(begin
(debug:print 0 "ERROR: cannot find megatest.config, exiting")
(exit))))
(debug:print-info 2 "Starting server using " transport " transport")
(set! *transport-type* transport)
(case transport
((fs) (exit)) ;; there is no "fs" server transport
((http) (http-transport:launch))
((zmq) (zmq-transport:launch))
(else
(debug:print "WARNING: unrecognised transport " transport)
(exit))))
;;======================================================================
;; Q U E U E M A N A G E M E N T
;;======================================================================
;; We don't want to flush the queue if it was just flushed
(define *server:last-write-flush* (current-milliseconds))
;; Flush the queue every third of a second. Can we assume that setup-for-run
;; has already been done?
(define (server:write-queue-handler)
(if (setup-for-run)
(let ((db (open-db)))
(let loop ()
(let ((last-write-flush-time #f))
(mutex-lock! *incoming-mutex*)
(set! last-write-flush-time *server:last-write-flush*)
(mutex-unlock! *incoming-mutex*)
(if (> (- (current-milliseconds) last-write-flush-time) 10)
(begin
(mutex-lock! *db:process-queue-mutex*)
(db:process-cached-writes db)
(mutex-unlock! *db:process-queue-mutex*)
(thread-sleep! 0.005))))
(loop)))
(begin
(debug:print 0 "ERROR: failed to setup for Megatest in server:write-queue-handler")
(exit 1))))
;;======================================================================
;; S E R V E R U T I L I T I E S
;;======================================================================
;; Generate a unique signature for this server
(define (server:mk-signature)
(message-digest-string (md5-primitive)
(with-output-to-string
(lambda ()
(write (list (current-directory)
(argv)))))))
;; 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
(case *transport-type*
((fs) result)
((http)(db:obj->string (vector success/fail query-sig result)))
((zmq)
(let ((pub-socket (vector-ref *runremote* 1)))
(send-message pub-socket return-addr send-more: #t)
(send-message pub-socket (db:obj->string (vector success/fail query-sig result)))))
(else
(debug:print 0 "ERROR: unrecognised transport type: " *transport-type*)
result)))
(define (server:ensure-running)
(let loop ((servers (open-run-close tasks:get-best-server tasks:open-db))
(trycount 0))
(if (or (not servers)
(null? servers))
(begin
(if (even? trycount) ;; just do the server start every other time through this loop (every 8 seconds)
(let ((cmdln (conc (if (getenv "MT_MEGATEST") (getenv "MT_MEGATEST") "megatest")
" -server - -daemonize")))
(debug:print 0 "INFO: Starting server (" cmdln ") as none running ...")
;; (server:launch (string->symbol (args:get-arg "-transport" "http"))))
;; no need to use fork, no need to do the list-servers trick. Just start the damn server, it will exit on it's own
;; if there is an existing server
(system cmdln)
(thread-sleep! 3)
;; (process-run (car (argv)) (list "-server" "-" "-daemonize" "-transport" (args:get-arg "-transport" "http")))
)
(begin
(debug:print-info 0 "Waiting for server to start")
(thread-sleep! 4)))
(if (< trycount 10)
(loop (open-run-close tasks:get-best-server tasks:open-db)
(+ trycount 1))
(debug:print 0 "WARNING: Couldn't start or find a server.")))
(debug:print 2 "INFO: Server(s) running " servers)
)))
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;; S E R V E R
;;======================================================================
;; Call this to start the actual server
;;
;; all routes though here end in exit ...
;;
;; start_server
;;
(define (server:launch run-id)
;; (if (server:check-if-running run-id)
;; a server is already running
;; (exit)
(http-transport:launch run-id))
;; (define (server:launch-no-exit run-id)
;; (if (server:check-if-running run-id)
;; #t ;; if running
;; (http-transport:launch run-id)))
;;======================================================================
;; Q U E U E M A N A G E M E N T
;;======================================================================
;; We don't want to flush the queue if it was just flushed
(define *server:last-write-flush* (current-milliseconds))
;; Flush the queue every third of a second. Can we assume that setup-for-run
;; has already been done?
;; (define (server:write-queue-handler)
;; (if (setup-for-run)
;; (let ((db (open-db)))
;; (let loop ()
;; (let ((last-write-flush-time #f))
;; (mutex-lock! *incoming-mutex*)
;; (set! last-write-flush-time *server:last-write-flush*)
;; (mutex-unlock! *incoming-mutex*)
;; (if (> (- (current-milliseconds) last-write-flush-time) 10)
;; (begin
;; (mutex-lock! *db:process-queue-mutex*)
;; (db:process-cached-writes db)
;; (mutex-unlock! *db:process-queue-mutex*)
;; (thread-sleep! 0.005))))
;; (loop)))
;; (begin
;; (debug:print 0 "ERROR: failed to setup for Megatest in server:write-queue-handler")
;; (exit 1))))
;;======================================================================
;; S E R V E R U T I L I T I E S
;;======================================================================
;; Generate a unique signature for this server
(define (server:mk-signature)
(message-digest-string (md5-primitive)
(with-output-to-string
(lambda ()
(write (list (current-directory)
(argv)))))))
;; 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)
(db:obj->string (vector success/fail query-sig result)))
;; > file 2>&1
(define (server:try-running run-id)
(let* ((rand-name (random 100))
(cmdln (conc (if (getenv "MT_MEGATEST") (getenv "MT_MEGATEST") "megatest")
" -server - -run-id " run-id " name=" rand-name " > " *toppath* "/db/" run-id "-" rand-name ".log 2>&1 &")))
(debug:print 0 "INFO: Starting server (" cmdln ") as none running ...")
(push-directory *toppath*)
(system cmdln)
(pop-directory)))
(define (server:check-if-running run-id)
(let loop ((server (open-run-close tasks:get-server tasks:open-db run-id))
(trycount 0))
(thread-sleep! 2)
(if server
;; note: client:start will set *runremote*. this needs to be changed
;; also, client:start will login to the server, also need to change that.
;;
;; client:start returns #t if login was successful.
;;
(let ((res (client:start run-id server)))
;; if the server didn't respond we must remove the record
(if res
res
(begin
(open-run-close tasks:server-force-clean-running-records-for-run-id tasks:open-db run-id)
res)))
#f)))
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