Megatest

(declare (uses commonmod))
(declare (uses configfmod))
(declare (uses mtmod))
(declare (uses debugprint))
(declare (uses mtargs))

(module servermod
	(
	 remote-hh-dat
	 server:mk-signature
	 common:wait-for-normalized-load
	 server:expiration-timeout
	 server:get-best-guess-address
	 
	 )

(import scheme
	chicken)
	
(use (srfi 18) extras s11n)
(use srfi-1 posix regex regex-case srfi-69 hostinfo md5 message-digest)
(use directory-utils posix-extras matchable utils)

	commonmod
	configfmod
	debugprint
	(prefix mtargs args:)
	mtmod
	)

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

(define (server:make-server-url hostport)
  (if (not hostport)
      #f
      (conc "http://" (car hostport) ":" (cadr hostport))))

;; check the .servinfo directory, are there other servers running on this
;; or another host?
;;
;; returns #t => ok to start another server
;;         #f => not ok to start another server
;;
;; (define (server:minimal-check areapath)
;;   (server:clean-up-old areapath)
;;   (let* ((srvdir      (server:get-servinfo-dir areapath)) ;; (conc areapath"/.servinfo"))
;; 	 (servrs      (glob (conc srvdir"/*")))
;; 	 (thishostip  (server:get-best-guess-address (get-host-name)))
;; 	 (thisservrs  (glob (conc srvdir"/"thishostip":*")))
;; 	 (homehostinf (server:choose-server areapath 'homehost))
;; 	 (havehome    (car homehostinf))
;; 	 (wearehome   (cdr homehostinf)))
;;     (debug:print-info 0 *default-log-port* thishostip", have homehost: "havehome", we are homehost: "wearehome
;; 		      ", numservers: "(length thisservrs))
;;     (cond
;;      ((not havehome) #t) ;; no homehost yet, go for it
;;      ((and havehome wearehome (< (length thisservrs) 20)) #t) ;; we are home and less than 20 servers, ok to start another
;;      ((and havehome (not wearehome)) #f)     ;; we are not the home host
;;      ((and havehome wearehome (>= (length thisservrs) 20)) #f) ;; have enough running
;;      (else
;;       (debug:print 0 *default-log-port* "WARNING: Unrecognised scenario, servrs="servrs", thishostip="thishostip", thisservrs="thisservrs)
;;       #t))))
	 

(define server-last-start 0)


;; oldest server alive determines host then choose random of youngest
;; five servers on that host
;;
;; mode:
;;   best - get best server (random of newest five)
;;   home - get home host based on oldest server
;;   info - print info
;; (define (server:choose-server areapath #!optional (mode 'best))
;;   ;; age is current-starttime
;;   ;; find oldest alive
;;   ;;   1. sort by age ascending and ping until good
;;   ;; find alive rand from youngest
;;   ;;   1. sort by age descending
;;   ;;   2. take five
;;   ;;   3. check alive, discard if not and repeat
;;   ;; first we clean up old server files
;;   (assert (eq? (rmt:transport-mode) 'http) "FATAL: server:run called with rmt:transport-mode="(rmt:transport-mode))
;;   (server:clean-up-old areapath)
;;   (let* ((since-last (- (current-seconds) server-last-start))
;;         (server-start-delay 10))     
;;     (if ( < (- (current-seconds) server-last-start) 10 )
;;       (begin
;;         (debug:print 2 *default-log-port* "server:choose-server: seconds since last server start: " (- (current-seconds) server-last-start))
;;         (debug:print 2 *default-log-port* "server:choose-server: last server start less than " server-start-delay " seconds ago. Sleeping " server-start-delay " seconds")
;;         (thread-sleep! server-start-delay)

;;       )
;;       (debug:print 2 *default-log-port* "server:choose-server: seconds since last server start: " (- (current-seconds) server-last-start))


;;     )
;;   )
;;   (let* ((serversdat  (server:get-servers-info areapath))
;; 	 (servkeys    (hash-table-keys serversdat))
;; 	 (by-time-asc (if (not (null? servkeys)) ;; NOTE: Oldest is last
;; 			  (sort servkeys ;; list of "host:port"
;; 				(lambda (a b)
;; 				  (>= (list-ref (hash-table-ref serversdat a) 2)
;; 				      (list-ref (hash-table-ref serversdat b) 2))))
;; 			  '())))
;;     (debug:print 2 *default-log-port* "server:choose-server: serversdat: " serversdat)
;;     (debug:print 2 *default-log-port* "server:choose-server: servkeys: " servkeys)
;;     (if (not (null? by-time-asc))
;; 	(let* ((oldest     (last by-time-asc))
;; 	       (oldest-dat (hash-table-ref serversdat oldest))
;; 	       (host       (list-ref oldest-dat 0))
;; 	       (all-valid  (filter (lambda (x)
;; 				     (equal? host (list-ref (hash-table-ref serversdat x) 0)))
;; 				   by-time-asc))
;; 	       (best-ten  (lambda ()
;; 			     (if (> (length all-valid) 11)
;; 				 (take (drop-right all-valid 1) 10) ;; remove the oldest from consideration so it can age out
;; 				 (if (> (length all-valid) 8)
;; 				     (drop-right all-valid 1)
;; 				     all-valid))))
;; 	       (names->dats (lambda (names)
;; 			      (map (lambda (x)
;; 				     (hash-table-ref serversdat x))
;; 				   names)))
;; 	       (am-home?    (lambda ()
;; 			      (let* ((currhost (get-host-name))
;; 				     (bestadrs (server:get-best-guess-address currhost)))
;; 				(or (equal? host currhost)
;; 				    (equal? host bestadrs))))))
;; 	  (case mode
;; 	    ((info)
;; 	     (debug:print 0 *default-log-port* "oldest: "oldest-dat", selected host: "host", all-valid: "all-valid)
;; 	     (debug:print 0 *default-log-port* "youngest: "(hash-table-ref serversdat (car all-valid))))
;; 	    ((home)     host)
;; 	    ((homehost) (cons host (am-home?))) ;; shut up old code
;; 	    ((home?)    (am-home?))
;; 	    ((best-ten)(names->dats (best-ten)))
;; 	    ((all-valid)(names->dats all-valid))
;; 	    ((best)     (let* ((best-ten (best-ten))
;; 			       (len       (length best-ten)))
;; 			  (hash-table-ref serversdat (list-ref best-ten (random len)))))
;; 	    ((count)(length all-valid))
;; 	    (else
;; 	     (debug:print 0 *default-log-port* "ERROR: invalid command "mode)
;; 	     #f)))
;; 	(begin
;; 	  (server:run areapath)
;;           (set! server-last-start (current-seconds))
;; 	  ;; (thread-sleep! 3)
;; 	  (case mode
;; 	    ((homehost) (cons #f #f))
;; 	    (else	#f))))))

(define (server:get-servinfo-dir areapath)
  (let* ((spath (conc areapath"/.servinfo")))
    (if (not (file-exists? spath))
	(create-directory spath #t))
    spath))

;; 
(defstruct remote

  ;; transport to be used
  ;; http              - use http-transport
  ;; http-read-cached  - use http-transport for writes but in-mem cached for reads
  (rmode            'http)
  (hh-dat            (let ((res (or ;; (server:choose-server *toppath* 'homehost)
				    (cons #f #f))))
		       (assert (pair? res)(conc "FATAL: hh-dat should be a pair, got "res))
		       res))
  (server-url        #f) ;; (server:check-if-running *toppath*) #f))
  (server-id         #f)
  (server-info       #f) ;; (if *toppath* (server:check-if-running *toppath*) #f))
  (last-server-check 0)  ;; last time we checked to see if the server was alive