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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 transport-type)
(case transport-type
((http)(http-transport:launch))
;;((nmsg)(nmsg-transport:launch run-id))
;;((rpc) (rpc-transport:launch run-id))
(else (debug:print-error 0 *default-log-port* "unknown server type " transport-type))))
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;; Given an area path, start a server process ### NOTE ### > file 2>&1
;; if the target-host is set
;; try running on that host
;; incidental: rotate logs in logs/ dir.
;;
(define (server:run areapath) ;; areapath is *toppath* for a given testsuite area
(let* (;; (curr-host (get-host-name))
;; (attempt-in-progress (server:start-attempted? areapath))
;; (dot-server-url (server:check-if-running areapath))
;; (curr-ip (server:get-best-guess-address curr-host))
;; (curr-pid (current-process-id))
;; (homehost (server:get-homehost)) ;; configf:lookup *configdat* "server" "homehost" ))
;; (target-host (car homehost))
(testsuite (common:get-testsuite-name))
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(hash-table-set! res hostport serverdat)
(debug:print-info 0 *default-log-port* "bad server info for "f": "serverdat)))
(else
(debug:print-info 0 *default-log-port* "bad server info for "f": "serverdat)))))
allfiles)
res)))
;; 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 (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))))
;; 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
(server:clean-up-old areapath)
(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))))
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#f)))
(begin
(server:run areapath)
(thread-sleep! 3)
(case mode
((homehost) (cons #f #f))
(else #f))))))
(define (server:clean-up-old areapath)
;; any server file that has not been touched in ten minutes is effectively dead
(let* ((sfiles (glob (conc areapath"/.servinfo/*"))))
(for-each
(lambda (sfile)
(let* ((modtime (handle-exceptions
exn
(begin
(debug:print 0 *default-log-port* "WARNING: failed to get modification file for "sfile)
(current-seconds))
(file-modification-time sfile))))
(if (and (number? modtime)
(> (- (current-seconds) modtime)
600))
(begin
(debug:print 0 *default-log-port* "WARNING: found old server info file "sfile", removing it.")
(handle-exceptions
exn
(debug:print 0 *default-log-port* "WARNING: failed to delete old server info file "sfile)
(delete-file sfile))))))
sfiles)))
;; would like to eventually get rid of this
;;
(define (common:on-homehost?)
(server:choose-server *toppath* 'home?))
;; kind start up of server, wait before allowing another server for a given
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