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;;======================================================================
(declare (unit servermod))
(declare (uses commonmod))
(declare (uses debugprint))
(declare (uses configfmod))
(declare (uses http-transportmod))
(declare (uses pkts))
(module servermod
*
(import scheme
chicken.base
chicken.string
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srfi-18
srfi-69
commonmod
debugprint
configfmod
http-transportmod
pkts
)
;;======================================================================
;; NEW SERVER METHOD
;;======================================================================
(define *srvpktspec*
`((server (host . h)
(port . p)
(servkey . k)
(pid . i)
(ipaddr . a)
(dbpath . d))))
(define (register-server pkts-dir pkt-spec host port servkey ipaddr dbpath)
(let* ((pkt-dat `((host . ,host)
(port . ,port)
(servkey . ,servkey)
(pid . ,(current-process-id))
(ipaddr . ,ipaddr)
(dbpath . ,dbpath))))
(write-alist->pkt
pkts-dir
pkt-dat
pktspec: pkt-spec
ptype: 'server)))
;; given a pkts dir read
;;
(define (get-all-server-pkts pktsdir-in pktspec)
(let* ((pktsdir (if (file-exists? pktsdir-in)
pktsdir-in
(begin
(create-directory pktsdir-in #t)
pktsdir-in)))
(all-pkt-files (glob (conc pktsdir "/*.pkt"))))
(map (lambda (pkt-file)
(read-pkt->alist pkt-file pktspec: pktspec))
all-pkt-files)))
(define (server-address srv-pkt)
(conc (alist-ref 'host srv-pkt) ":"
(alist-ref 'port srv-pkt)))
(define (server-ready? server-address)
;; ping the server and ask it
;; if it ready
#f)
;; from the pkts return servers associated with dbpath
;; NOTE: Only one can be alive - have to check on each
;; in the list of pkts returned
;;
(define (get-viable-servers serv-pkts dbpath)
(let loop ((tail serv-pkts)
(res '()))
(if (null? tail)
res ;; NOTE: sort by age so oldest is considered first
(let* ((spkt (car tail)))
(loop (cdr tail)
(if (equal? dbpath (alist-ref 'dbpath spkt))
(cons spkt res)
res))))))
;; from viable servers get one that is alive and ready
;;
(define (get-the-server serv-pkts dbpath)
(let loop ((tail serv-pkts))
(if (null? tail)
#f
(let* ((spkt (car tail))
(addr (server-address spkt)))
(if (server-ready? addr)
spkt
(loop (cdr tail)))))))
;;======================================================================
;; END NEW SERVER METHOD
;;======================================================================
(define (server:make-server-url hostport)
(if (not hostport)
#f
(conc "http://" (car hostport) ":" (cadr hostport))))
;;======================================================================
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