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server-id)))
(define (tasks:have-clients? mdb server-id)
(null? (tasks:get-logged-in-clients mdb server-id)))
;; ping each server in the db and return first found that responds.
;; remove any others. will not necessarily remove all!
(define (tasks:get-best-server mdb)
(let ((res '())
(best #f))
(sqlite3:for-each-row
(lambda (id hostname port)
(set! res (cons (list hostname port) res))
(debug:print-info 1 "Found " hostname ":" port))
mdb
"SELECT id,hostname,port FROM servers WHERE state='live' ORDER BY start_time DESC LIMIT 1;")
;; (print "res=" res)
(if (null? res) #f
(let loop ((hed (car res))
(tal (cdr res)))
;; (print "hed=" hed ", tal=" tal)
(let* ((host (car hed))
(port (cadr hed))
(ping-res (server:ping host port)))
(if ping-res hed
;; remove defunct server from table
(begin
(open-run-close tasks:server-deregister tasks:open-db host port: port)
(if (null? tal)
#f
(loop (car tal)(cdr tal))))))))))
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server-id)))
(define (tasks:have-clients? mdb server-id)
(null? (tasks:get-logged-in-clients mdb server-id)))
;; ping each server in the db and return first found that responds.
;; remove any others. will not necessarily remove all!
(define (tasks:get-best-server mdb #!key (do-ping #f))
(let ((res '())
(best #f))
(sqlite3:for-each-row
(lambda (id hostname port)
(set! res (cons (list hostname port) res))
(debug:print-info 1 "Found " hostname ":" port))
mdb
"SELECT id,hostname,port FROM servers WHERE state='live' ORDER BY start_time DESC LIMIT 1;")
;; (print "res=" res)
(if (null? res) #f
(let loop ((hed (car res))
(tal (cdr res)))
;; (print "hed=" hed ", tal=" tal)
(let* ((host (car hed))
(port (cadr hed))
(ping-res (if do-ping (server:ping host port return-socket: #f) '(#t "NO PING" #f)))
(alive (car ping-res))
(reason (cadr ping-res))
(zsocket (caddr ping-res)))
(if alive (list host port zsocket)
;; remove defunct server from table
(begin
(open-run-close tasks:server-deregister tasks:open-db host port: port)
(if (null? tal)
#f
(loop (car tal)(cdr tal))))))))))
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