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(define (tasks:server-register mdb pid interface port priority state)
(sqlite3:execute
mdb
"INSERT OR REPLACE INTO servers (pid,hostname,port,start_time,priority,state,mt_version,heartbeat,interface)
VALUES(?, ?, ?, strftime('%s','now'), ?, ?, ?, strftime('%s','now'),?);"
pid (get-host-name) port priority (conc state) megatest-version interface)
(list
(tasks:server-get-server-id mdb (get-host-name) port pid)
(tasks:server-get-server-id mdb (get-host-name) interface port pid)
interface
port
))
;; NB// two servers with same pid on different hosts will be removed from the list if pid: is used!
(define (tasks:server-deregister mdb hostname #!key (port #f)(pid #f)(action 'markdead))
(debug:print-info 11 "server-deregister " hostname ", port " port ", pid " pid)
(if pid
(case action
((delete)(sqlite3:execute mdb "DELETE FROM servers WHERE pid=?;" pid))
(else (sqlite3:execute mdb "UPDATE servers SET state='dead' WHERE pid=?;" pid)))
(if port
(case action
((delete)(sqlite3:execute mdb "DELETE FROM servers WHERE hostname=? AND port=?;" hostname port))
(else (sqlite3:execute mdb "UPDATE servers SET state='dead' WHERE hostname=? AND port=?;" hostname port)))
(debug:print 0 "ERROR: tasks:server-deregister called with neither pid nor port specified"))))
(define (tasks:server-deregister-self mdb hostname)
(tasks:server-deregister mdb hostname pid: (current-process-id)))
(define (tasks:server-get-server-id mdb hostname port pid)
(define (tasks:server-get-server-id mdb hostname iface port pid)
(let ((res #f))
(sqlite3:for-each-row
(lambda (id)
(set! res id))
mdb
(cond
(if (and hostname pid)
"SELECT id FROM servers WHERE hostname=? AND pid=?;"
"SELECT id FROM servers WHERE hostname=? AND port=?;")
hostname (if pid pid port))
((and hostname pid) "SELECT id FROM servers WHERE hostname=? AND pid=?;")
((and iface port) "SELECT id FROM servers WHERE interface=? AND port=?;")
((and hostname port) "SELECT id FROM servers WHERE hostname=? AND port=?;")
(else
(begin
(debug:print 0 "ERROR: tasks:server-get-server-id needs (hostname and pid) OR (iface and port) OR (hostname and port)")
"SELECT id FROM servers WHERE pid=-999;")))
(if hostname hostname iface)(if pid pid port))
res))
(define (tasks:server-update-heartbeat mdb server-id)
(sqlite3:execute mdb "UPDATE servers SET heartbeat=strftime('%s','now') WHERE id=?;" server-id))
;; alive servers keep the heartbeat field upto date with seconds every 6 or so seconds
(define (tasks:server-alive? mdb server-id #!key (hostname #f)(port #f)(pid #f))
(define (tasks:server-alive? mdb server-id #!key (iface #f)(hostname #f)(port #f)(pid #f))
(let* ((server-id (if server-id
server-id
(tasks:server-get-server-id mdb hostname port pid)))
(tasks:server-get-server-id mdb hostname iface port pid)))
(heartbeat-delta 99e9))
(sqlite3:for-each-row
(lambda (delta)
(set! heartbeat-delta delta))
mdb "SELECT strftime('%s','now')-heartbeat FROM servers WHERE id=?;" server-id)
(< heartbeat-delta 10)))
(define (tasks:client-register mdb pid hostname cmdline)
(sqlite3:execute
mdb
"INSERT OR REPLACE INTO clients (server_id,pid,hostname,cmdline,login_time) VALUES(?,?,?,?,strftime('%s','now'));")
(tasks:server-get-server-id mdb hostname #f pid)
(tasks:server-get-server-id mdb hostname #f #f pid)
pid hostname cmdline)
(define (tasks:client-logout mdb pid hostname cmdline)
(sqlite3:execute
mdb
"UPDATE clients SET logout_time=strftime('%s','now') WHERE pid=? AND hostname=? AND cmdline=?;"
pid hostname cmdline))
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(lambda (id hostname interface port pid)
(set! res (cons (list hostname interface port pid) res))
(debug:print-info 2 "Found existing server " hostname ":" port " registered in db"))
mdb
"SELECT id,hostname,interface,port,pid FROM servers
WHERE strftime('%s','now')-heartbeat < 10
AND mt_version=? ORDER BY start_time ASC LIMIT 1;" megatest-version)
;; for now we are keeping only one server registered in the db, return #f or first server found
(if (null? res) #f
(let loop ((hed (car res))
(tal (cdr res)))
;; (print "hed=" hed ", tal=" tal)
(let* ((host (list-ref hed 0))
(iface (list-ref hed 1))
(port (list-ref hed 2))
(pid (list-ref hed 4))
(alive (open-run-close tasks:server-alive? tasks:open-db #f hostname: host port: port)))
(if alive
(begin
(debug:print-info 2 "Found an existing, alive, server " host ", " port ".")
(list host iface port))
(begin
(debug:print-info 1 "Marking " host ":" port " as dead in server registry.")
(if port
(open-run-close tasks:server-deregister tasks:open-db host port: port)
(open-run-close tasks:server-deregister tasks:open-db host pid: pid))
(if (null? tal)
#f
(loop (car tal)(cdr tal))))))))))
(if (null? res) #f (car res))))
;; BUG: This logic is probably needed unless methodology changes completely...
;;
;; (if (null? res) #f
;; (let loop ((hed (car res))
;; (tal (cdr res)))
;; ;; (print "hed=" hed ", tal=" tal)
;; (let* ((host (list-ref hed 0))
;; (iface (list-ref hed 1))
;; (port (list-ref hed 2))
;; (pid (list-ref hed 4))
;; (alive (open-run-close tasks:server-alive? tasks:open-db #f hostname: host port: port)))
;; (if alive
;; (begin
;; (debug:print-info 2 "Found an existing, alive, server " host ", " port ".")
;; (list host iface port))
;; (begin
;; (debug:print-info 1 "Marking " host ":" port " as dead in server registry.")
;; (if port
;; (open-run-close tasks:server-deregister tasks:open-db host port: port)
;; (open-run-close tasks:server-deregister tasks:open-db host pid: pid))
;; (if (null? tal)
;; #f
;; (loop (car tal)(cdr tal))))))))))
(define (tasks:remove-server-records mdb)
(sqlite3:exec mdb "DELETE FROM servers;"))
(sqlite3:execute mdb "DELETE FROM servers;"))
(define (tasks:mark-server hostname port pid state)
(if port
(open-run-close tasks:server-deregister tasks:open-db hostname port: port)
(open-run-close tasks:server-deregister tasks:open-db hostname pid: pid)))
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