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hostname TEXT,
username TEXT,
CONSTRAINT monitors_constraint UNIQUE (pid,hostname));")
(sqlite3:execute mdb "CREATE TABLE IF NOT EXISTS servers (id INTEGER PRIMARY KEY,
pid INTEGER,
interface TEXT,
hostname TEXT,
port INTEGER,
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)(action 'markdead))
(debug:print-info 11 "server-deregister " hostname ", pullport " pullport ", pid " pid)
(if pid
(case action
;; (sqlite3:execute mdb "DELETE FROM servers WHERE pid=?;" pid)
(sqlite3:execute mdb "UPDATE servers SET state='dead' WHERE pid=?;" pid)
(if port
;; (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)
(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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;; 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 interface port pid)
(set! res (cons (list hostname interface port pid) res))
(debug:print-info 2 "Found existing server " hostname ":" port " registered in db"))
(lambda (id hostname interface pullport pubport pid)
(set! res (cons (list hostname interface pullport pubport pid) res))
(debug:print-info 2 "Found existing server " hostname ":" pullport " registered in db"))
mdb
"SELECT id,hostname,interface,pullport,pubport,pid FROM servers
WHERE strftime('%s','now')-heartbeat < 10
"SELECT id,hostname,interface,port,pid FROM servers WHERE state='live' AND mt_version=? ORDER BY start_time ASC LIMIT 1;" megatest-version)
AND mt_version=? ORDER BY start_time ASC LIMIT 1;" megatest-version)
;; (print "res=" res)
(let* ((host (car hed))
(iface (cadr hed))
(port (caddr hed))
(pid (cadddr hed))
(alive (open-run-close tasks:server-alive? tasks:open-db #f hostname: host port: port)))
(let* ((host (list-ref hed 0))
(iface (list-ref hed 1))
(pullport (list-ref hed 2))
(pubport (list-ref hed 3))
(pid (list-ref hed 4))
(alive (open-run-close tasks:server-alive? tasks:open-db #f hostname: host pullport: pullport)))
(if alive
(begin
(debug:print-info 2 "Found an existing, alive, server " host ":" port ".")
(list host iface port))
(debug:print-info 2 "Found an existing, alive, server " host ", " pullport " and " pubport ".")
(list host iface pullport pubport))
(begin
(debug:print-info 1 "Removing " host ":" port " from server registry as it appears to be dead")
(tasks:kill-server #f host port pid)
(debug:print-info 1 "Marking " host ":" pullport " as dead in server registry.")
(if pullport
(open-run-close tasks:server-deregister tasks:open-db host pullport: pullport)
(open-run-close tasks:server-deregister tasks:open-db host pid: pid))
(if (null? tal)
#f
(loop (car tal)(cdr tal))))))))))
(define (tasks:mark-server hostname pullport 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)))
;; NOTE: NOT PORTED TO WORK WITH pullport/pubport
(define (tasks:kill-server status hostname port pid)
(debug:print-info 1 "Removing defunct server record for " hostname ":" port)
(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))
(if status ;; #t means alive
(begin
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(if (equal? hostname (get-host-name))
(begin
(debug:print-info 1 "Sending signal/term to " pid " on " hostname)
(process-signal pid signal/term) ;; local machine, send sig term
(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 last-update)
(set! res (cons (vector id pid hostname interface pullport pubport start-time priority state mt-version last-update) 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,strftime('%s','now')-heartbeat AS last_update FROM servers ORDER BY start_time DESC;")
res))
;;======================================================================
;; Tasks and Task monitors
;;======================================================================
|