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(sqlite3:execute mdb "CREATE TABLE IF NOT EXISTS servers (id INTEGER PRIMARY KEY,
pid INTEGER,
hostname TEXT,
port INTEGER,
start_time TIMESTAMP,
priority INTEGER,
state TEXT,
mt_version TEXT,
heartbeat TIMESTAMP,
CONSTRAINT servers_constraint UNIQUE (pid,hostname));")
CONSTRAINT servers_constraint UNIQUE (pid,hostname,port));")
(sqlite3:execute mdb "CREATE TABLE IF NOT EXISTS clients (id INTEGER PRIMARY KEY,
server_id INTEGER,
pid INTEGER,
hostname TEXT,
cmdline TEXT,
login_time TIMESTAMP,
logout_time TIMESTAMP DEFAULT -1,
CONSTRAINT clients_constraint UNIQUE (pid,hostname));")
))
mdb))
;;======================================================================
;; Server and client management
;;======================================================================
;; state: 'live, 'shutting-down, 'dead
(define (tasks:server-register mdb pid hostname port priority state)
(sqlite3:execute
mdb
"INSERT OR REPLACE INTO servers (pid,hostname,port,start_time,priority,state) VALUES(?,?,?,strftime('%s','now'),?,?);"
pid hostname port priority (conc state)))
"INSERT OR REPLACE INTO servers (pid,hostname,port,start_time,priority,state,mt_version,heartbeat) VALUES(?,?,?,strftime('%s','now'),?,?,?,strftime('%s','now'));"
pid hostname port priority (conc state) megatest-version)
(tasks:server-get-server-id mdb hostname port pid))
;; 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))
(debug:print-info 11 "server-deregister " hostname ", port " port ", pid " pid)
(if pid
(sqlite3:execute mdb "DELETE FROM servers WHERE pid=?;" pid)
(if port
(sqlite3:execute mdb "DELETE FROM servers 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)
;; dunno yet
0)
(define (tasks:server-get-server-id mdb host port pid)
(let ((res #f))
(sqlite3:for-each-row
(lambda (id)
(set! res id))
mdb
(if (and host pid)
"SELECT id FROM servers WHERE hostname=? AND pid=?;"
"SELECT id FROM servers WHERE hostname=? AND port=?;")
host (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))
(let* ((server-id (if server-id
server-id
(tasks:server-get-server-id mdb hostname 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)
(< (- (current-seconds) 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)
pid hostname cmdline)
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(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;")
"SELECT id,hostname,port FROM servers WHERE state='live' AND mt_version=? ORDER BY start_time DESC LIMIT 1;" megatest-version)
;; (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)
;; (ping-res (if do-ping (server:ping host port return-socket: #f) '(#t "NO PING" #f)))
(alive (open-run-close tasks:server-alive? tasks:open-db host port: port)) ;; (car ping-res))
;; (reason (cadr ping-res))
;; (zsocket (caddr ping-res))
)
(if alive (list host port)
;; 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))))))))))
(define (tasks:get-all-servers mdb)
(let ((res '()))
(sqlite3:for-each-row
(lambda (id pid hostname port start-time priority state)
(set! res (cons (vector id pid hostname port start-time priority state) res)))
(lambda (id pid hostname port start-time priority state mt-version)
(set! res (cons (vector id pid hostname port start-time priority state mt-version) res)))
mdb
"SELECT id,pid,hostname,port,start_time,priority,state FROM servers ORDER BY start_time DESC;")
"SELECT id,pid,hostname,port,start_time,priority,state,mt_version FROM servers ORDER BY start_time DESC;")
res))
;;======================================================================
;; Tasks and Task monitors
;;======================================================================
|