Megatest

;;======================================================================
;; Copyright 2006-2013, 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.
;;======================================================================

(use format numbers sql-de-lite srfi-1 posix regex regex-case srfi-69 nanomsg srfi-18)
(require-library iup)
(import (prefix iup iup:))
(use canvas-draw)


(declare (uses margs))

(declare (uses megatest-version))
(declare (uses gutils))
(declare (uses tree))



(declare (uses configf))
(declare (uses portlogger))

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

(define help (conc 
	      "Megatest Dashboard, documentation at http://www.kiatoa.com/fossils/megatest

	    (hash-table-set! tab-ids index hed)
	    (debug:print 0 "Adding area " hed " with index " index " to dashboard")
	    (iup:attribute-set! tabtop (conc "TABTITLE" index) hed)
	    (if (not (null? tal))
		(loop (+ index 1)(car tal)(cdr tal)))))
      tabtop))))


;;======================================================================
;; N A N O M S G   S E R V E R
;;======================================================================

(define (dboard:server-service soc port)
  (print "server starting")
  (let loop ((msg-in (nn-recv soc))
	     (count  0))
    (if (eq? 0 (modulo count 1000))
	(print "server received: " msg-in ", count=" count))
    (cond
     ((equal? msg-in "quit")
      (nn-send soc "Ok, quitting"))
     ((and (>= (string-length msg-in) 4)
	   (equal? (substring msg-in 0 4) "ping"))
      (nn-send soc (conc (current-process-id)))
      (loop (nn-recv soc)(+ count 1)))
     (else
      (mutex-lock! *current-delay-mutex*)
      (let ((current-delay *current-delay*))
	(mutex-unlock! *current-delay-mutex*)
	;; (thread-sleep! current-delay)
	(nn-send soc (conc current-delay " hello " msg-in " you waited " current-delay " seconds"))
	(loop (nn-recv soc)(if (> count 20000000)
			       0
			       (+ count 1))))))))

(define (dboard:one-time-ping-receive soc port)
  (let ((msg-in (nn-recv soc)))
    (if (and (>= (string-length msg-in) 4)
	     (equal? (substring msg-in 0 4) "ping"))
	(nn-send soc (conc (current-process-id))))))

(define (dboard:server-start given-port #!key (num-tries 200))
  (let* ((rep (nn-socket 'rep))
	 (port (or given-port  (portlogger:main "find")))
	 (con (conc "tcp://*:" port)))
    ;; register this connect here ....
    (nn-bind rep con)
    (thread-start! 
     (make-thread (lambda ()
		    (dboard:one-time-ping-receive rep port))
		  "one time receive thread"))
    (if (dboard:ping-self "localhost" port)
	(begin
	  (print "INFO: dashboard nanomsg server started on " port)
	  (values rep port))
	(begin
	  (print "WARNING: couldn't create server on port " port)
	  (portlogger:main "set" "failed")
	  (if (> num-tries 0)
	      (dboard:server-start #f (- num-tries 1))
	      (begin
		(print "ERROR: failed to start nanomsg server")
		(values #f #f)))))))

(define (dboard:server-close con port)
  (nn-close con)
  (portlogger:main "set" port "released"))

(define (dboard:ping-self host port #!key (return-socket #t))
  ;; send a random number along with pid and check that we get it back
  (let* ((req     (nn-socket 'req))
	 (key     "ping")
	 (success #f)
	 (keepwaiting #t)
	 (ping    (make-thread
		   (lambda ()
		     (print "ping: sending string \"" key "\", expecting " (current-process-id))
		     (nn-send req key)
		     (let ((result  (nn-recv req)))
		       (if (equal? (conc (current-process-id)) result)
			   (begin
			     (print "ping, success: received \"" result "\"")
			     (set! success #t))
			   (begin
			     (print "ping, failed: received key \"" result "\"")
			     (set! keepwaiting #f)
			     (set! success #f)))))
		   "ping"))
	 (timeout (make-thread (lambda ()
				 (let loop ((count 0))
				   (thread-sleep! 1)
				   (print "still waiting after " count " seconds...")
				   (if (and keepwaiting (< count 10))
				       (loop (+ count 1))))
				 (if keepwaiting
				     (begin
				       (print "timeout waiting for ping")
				       (thread-terminate! ping))))
			       "timeout")))
    (nn-connect req (conc "tcp://" host ":" port))
    (handle-exceptions
     exn
     (begin
       (print-call-chain)
       (print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
       (print "exn=" (condition->list exn))
       (print "ping failed to connect to " host ":" port))
     (thread-start! timeout)
     (thread-start! ping)
     (thread-join! ping)
     (if success (thread-terminate! timeout)))
    (if return-socket
	(if success req #f)
	(begin
	  (nn-close req)
	  success))))

;;======================================================================
;; C O N F I G U R A T I O N 
;;======================================================================

;; Get the configuration file for a group name, if the group name is "default" and it doesn't 
;; exist, create it and add the current path if it contains megatest.config
;;

;; ease debugging by loading ~/.dashboardrc
(let ((debugcontrolf (conc (get-environment-variable "HOME") "/.dashboardrc")))
  (if (file-exists? debugcontrolf)
      (load debugcontrolf)))

(let-values 
 (((con port)(dboard:server-start #f)))
 (thread-start! (make-thread (lambda ()(dboard:server-service con port)) "server service"))
 (dboard:make-window 0)
 (dboard:server-close con port))