Megatest

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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 rpc)
(import (prefix rpc rpc:))

(use sqlite3 srfi-1 posix regex regex-case srfi-69 hostinfo)
(import (prefix sqlite3 sqlite3:))





(declare (unit server))

(declare (uses common))
(declare (uses db))
(declare (uses tests))


(include "common_records.scm")
(include "db_records.scm")





;; procstr is the name of the procedure to be called as a string



(define (server:autoremote procstr params)



  (handle-exceptions


   exn






   (begin
     (debug:print 1 "Remote failed for " proc " " params)

     (apply (eval (string->symbol procstr)) params))








   ;; (if *runremote*
   ;;    (apply (eval (string->symbol (conc "remote:" procstr))) params)






   (apply (eval (string->symbol procstr)) params)))





(define (server:start db hostn)
  (debug:print 0 "Attempting to start the server ...")
  (let ((host:port      (db:get-var db "SERVER"))) ;; do whe already have a server running?
    (if host:port 
	(set! *runremote* (let* ((lst  (string-split host:port ":"))
				 (port (if (> (length lst) 1)
					   (string->number (cadr lst))
					   #f)))
			    (if port (vector (car lst) port) #f)))
	(let* ((rpc:listener   (server:find-free-port-and-open (rpc:default-server-port)))





	       (th1            (make-thread

				(cute (rpc:make-server rpc:listener) "rpc:server")
				'rpc:server))
	       (th2            (make-thread (lambda ()(db:updater))))
	       (hostname       (if (string=? "-" hostn)
				   (get-host-name) 
				   hostn))

	       (ipaddrstr      (if (string=? "-" hostn)


				   (string-intersperse (map number->string (u8vector->list (hostname->ip hostname))) ".")
				   #f))
	       (host:port      (conc (if ipaddrstr ipaddrstr hostname) ":" (rpc:default-server-port))))
	  (debug:print 0 "Server started on " host:port)
	  (db:set-var db "SERVER" host:port)
	  (set! *cache-on* #t)










	  
	  ;; can use this to run most anything at the remote
	  (rpc:publish-procedure! 



	   'remote:run 

	   (lambda (procstr . params)
	     (server:autoremote procstr params)))





	  
	  (rpc:publish-procedure!
	   'server:login
	   (lambda (toppath)
	     (set! *last-db-access* (current-seconds))
	     (if (equal? *toppath* toppath)
		 (begin
		   (debug:print 2 "INFO: login successful")

		   #t)












		 #f)))


	  ;;======================================================================








	  ;; db specials here
	  ;;======================================================================
	  ;; remote call to open-run-close
	  (rpc:publish-procedure!




	   'rdb:open-run-close 
	   (lambda (procname . remargs)
	     (debug:print 4 "INFO: Remote call of rdb:open-run-close " procname " " remargs)
	     (set! *last-db-access* (current-seconds))
	     (apply open-run-close (eval procname) remargs)))





	  
	  (rpc:publish-procedure!
	   'cdb:test-set-status-state
	   (lambda (test-id status state msg)
	     (debug:print 4 "INFO: Remote call of cdb:test-set-status-state test-id=" test-id ", status=" status ", state=" state ", msg=" msg)
	     (cdb:test-set-status-state test-id status state msg)))

	  (rpc:publish-procedure!
	   'cdb:test-rollup-test_data-pass-fail
	   (lambda (test-id)
	     (debug:print 4 "INFO: Remote call of cdb:test-rollup-test_data-pass-fail " test-id)

	     (cdb:test-rollup-test_data-pass-fail test-id)))










	  (rpc:publish-procedure!
	   'cdb:pass-fail-counts
	   (lambda (test-id fail-count pass-count)
	     (debug:print 4 "INFO: Remote call of cdb:pass-fail-counts " test-id " passes: " pass-count " fails: " fail-count)
	     (cdb:pass-fail-counts test-id fail-count pass-count)))








	  (rpc:publish-procedure!
	   'cdb:tests-register-test
	   (lambda (db run-id test-name item-path)
	     (debug:print 4 "INFO: Remote call of cdb:tests-register-test " run-id " testname: " test-name " item-path: " item-path)
	     (cdb:tests-register-test db run-id test-name item-path)))








	  (rpc:publish-procedure!

	   'cdb:flush-queue
	   (lambda ()


	     (debug:print 4 "INFO: Remote call of cdb:flush-queue")


	     (cdb:flush-queue)))


















	  ;;======================================================================
	  ;; end of publish-procedure section
	  ;;======================================================================




	  (set! *rpc:listener* rpc:listener)


	  (on-exit (lambda ()

		     (open-run-close
		      (lambda (db . params)
			(sqlite3:execute db "DELETE FROM metadat WHERE var='SERVER' and val=?;" host:port))
		      #f ;; for db
		      #f) ;; for a param

		     (let loop ((n 0))


		       (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 0 "INFO: Queue not flushed, waiting ...")
			       (loop (+ n 1)))))










		      )))
	  (thread-start! th1)












	  ;; (debug:print 0 "Server started on port " (rpc:default-server-port) "...")
	  (thread-start! th2)
	  ;; (thread-join!  th2)


	  ;; return th2 for the calling process to do a join with 
	  th2
	  )))) ;; rpc:server)))





(define (server:keep-running db host:port)
  ;; if none running or if > 20 seconds since 
  ;; server last used then start shutdown

  (let loop ((count 0))
    (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 0 "INFO: Server continuing, tests running: " numrunning ", seconds since last db access: " (- (current-seconds) *last-db-access*))
	    (loop (+ 1 count)))
	  (begin


	    (debug:print 0 "INFO: Starting to shutdown the server side")
	    ;; need to delete only *my* server entry (future use)
	    (sqlite3:execute db "DELETE FROM metadat WHERE var='SERVER' AND val like ?;"  host:port)





	    (thread-sleep! 10)
	    (debug:print 0 "INFO: Max cached queries was " *max-cache-size*)


	    (debug:print 0 "INFO: Server shutdown complete. Exiting")
	    ;; (exit)))
	    )))))


(define (server:find-free-port-and-open port)
  (handle-exceptions











   exn


   (begin
     (print "Failed to bind to port " (rpc:default-server-port) ", trying next port")
     (server:find-free-port-and-open (+ port 1)))


   (rpc:default-server-port port)
   (tcp-read-timeout 240000)


   (tcp-listen (rpc:default-server-port) 10000)))


(define (server:client-setup)
  (if *runremote*

      (begin
	(debug:print 0 "ERROR: Attempt to connect to server but already connected")
	#f)

      (let* ((hostinfo (open-run-close db:get-var #f "SERVER"))
	     (hostdat  (if hostinfo (string-split hostinfo ":") #f))
	     (host     (if hostinfo (car hostdat) #f))

	     (port     (if (and hostinfo (> (length hostdat) 1))(cadr hostdat) #f)))


	(if (and port

		 (string->number port))








	    (let ((portn (string->number port)))
	      (debug:print 2 "INFO: Setting up to connect to host " host ":" port)

	      (handle-exceptions
	       exn
	       (begin




		 (debug:print 0 "ERROR: Failed to open a connection to the server at host: " host " port: " port)

		 (debug:print 0 "   EXCEPTION: " ((condition-property-accessor 'exn 'message) exn))
		 ;; (open-run-close 
		 ;;  (lambda (db . param) 
		 ;;    (sqlite3:execute db "DELETE FROM metadat WHERE var='SERVER'"))
		 ;;  #f)

		 (set! *runremote* #f))


	       (if (and (not (args:get-arg "-server")) ;; no point in the server using the server using the server


			((rpc:procedure 'server:login host portn) *toppath*))
		   (begin
		     (debug:print 2 "INFO: Logged in and connected to " host ":" port)
		     (set! *runremote* (vector host portn)))
		   (begin
		     (debug:print 2 "INFO: Failed to login or connect to " host ":" port)
		     (set! *runremote* #f)))))
	    (debug:print 2 "INFO: no server available")))))











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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 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)

(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))
	  (debug:print 0 "Server started on " host:port)

;;======================================================================
;; S E R V E R
;;======================================================================

;; Call this to start the actual 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)
  ;; 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)
	 (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)
  (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))))