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pullport INTEGER,
pubport INTEGER,
start_time TIMESTAMP,
priority INTEGER,
state TEXT,
mt_version TEXT,
heartbeat TIMESTAMP,
CONSTRAINT servers_constraint UNIQUE (pid,hostname,port));")
CONSTRAINT servers_constraint UNIQUE (pid,hostname,pullport,pubport));")
(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 interface port priority state)
(define (tasks:server-register mdb pid interface pullport pubport 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)
"INSERT OR REPLACE INTO servers (pid,hostname,pullport,pubport,start_time,priority,state,mt_version,heartbeat,interface)
VALUES(?, ?, ?, ?, strftime('%s','now'), ?, ?, ?, strftime('%s','now'),?);"
pid (get-host-name) pullport pubport 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) pullport pid)
interface
pullport
port))
pubport))
;; 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)
(define (tasks:server-deregister mdb hostname #!key (pullport #f)(pid #f))
(debug:print-info 11 "server-deregister " hostname ", pullport " pullport ", pid " pid)
(if pid
;; (sqlite3:execute mdb "DELETE FROM servers WHERE pid=?;" pid)
(sqlite3:execute mdb "UPDATE servers SET state='dead' WHERE pid=?;" pid)
(if port
(if pullport
;; (sqlite3:execute mdb "DELETE FROM servers WHERE hostname=? AND port=?;" hostname port)
(sqlite3:execute mdb "UPDATE servers SET state='dead' WHERE hostname=? AND port=?;" hostname port)
(sqlite3:execute mdb "UPDATE servers SET state='dead' WHERE hostname=? AND pullport=?;" hostname pullport)
(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 pullport pid)
(let ((res #f))
(sqlite3:for-each-row
(lambda (id)
(set! res id))
mdb
(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))
"SELECT id FROM servers WHERE hostname=? AND pullport=?;")
hostname (if pid pid pullport))
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 (hostname #f)(pullport #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 pullport 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)))
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(thread-sleep! 5) ;; give it five seconds to die peacefully then do a brutal kill
(process-signal pid signal/kill))
(debug:print 0 "WARNING: Can't kill frozen server on remote host " hostname))))))
(define (tasks:get-all-servers mdb)
(let ((res '()))
(sqlite3:for-each-row
(lambda (id pid hostname interface port start-time priority state mt-version)
(set! res (cons (vector id pid hostname interface port start-time priority state mt-version) res)))
(lambda (id pid hostname interface pullport pubport start-time priority state mt-version)
(set! res (cons (vector id pid hostname interface pullport pubport start-time priority state mt-version) res)))
mdb
"SELECT id,pid,hostname,interface,port,start_time,priority,state,mt_version FROM servers ORDER BY start_time DESC;")
"SELECT id,pid,hostname,interface,pullport,pubport,start_time,priority,state,mt_version FROM servers ORDER BY start_time DESC;")
res))
;;======================================================================
;; Tasks and Task monitors
;;======================================================================
|