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;; state: 'live, 'shutting-down, 'dead
(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) 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))
(debug:print-info 11 "server-deregister " hostname ", port " port ", pid " pid)
(if pid
(sqlite3:execute mdb "DELETE FROM servers WHERE pid=?;" pid)
;; (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 "DELETE FROM servers WHERE hostname=? AND port=?;" hostname port)
(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)
(let ((res #f))
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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)
(debug:print 1 "Found heartbeat-delta of " heartbeat-delta " for server with 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)
(tasks:server-get-server-id mdb hostname #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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server-id)))
(define (tasks:have-clients? mdb server-id)
(null? (tasks:get-logged-in-clients mdb server-id)))
;; 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 #!key (do-ping #f))
(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 1 "Found " hostname ":" port))
(debug:print-info 1 "Found existing server " hostname ":" port " registered in db"))
mdb
"SELECT id,hostname,interface,port,pid 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))
(iface (cadr hed))
(port (caddr hed))
(pid (cadddr hed))
;; (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 (server:ping iface port)
(list host iface port)
(debug:print 1 "Found an existing, alive, server " host ":" port ".")
(list host iface port))
;; ;; not actually alive, destroy!
;; (begin
;; (if (equal? host (get-host-name))
;; (begin
;; (debug:print-info 0 "Killing process " pid " on host " host " with signal/term")
;; (send-signal pid signal/term))
;; (debug:print 0 "WARNING: Can't kill process " pid " on host " host))
;; (open-run-close tasks:server-deregister tasks:open-db host port: port)
;; #f))
;; remove defunct server from table
(open-run-close tasks:server-deregister tasks:open-db host port: port)
(tasks:kill-server #f host port pid)
(if (null? tal)
#f
(loop (car tal)(cdr tal))))))))))
(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
(if (equal? hostname (get-host-name))
(begin
(debug:print 1 "Sending signal/term to " pid " on " hostname)
(process-signal pid signal/term)
(thread-sleep! 5) ;; give it five seconds to die peacefully then do a brutal kill
(process-signal pid signal/kill)) ;; local machine, send sig term
(begin
(debug:print-info 1 "Telling alive server on " hostname ":" port " to commit servercide")
(cdb:kill-server zmq-socket)))) ;; remote machine, try telling server to commit suicide
(begin
(if status
(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)))
mdb
"SELECT id,pid,hostname,interface,port,start_time,priority,state,mt_version FROM servers ORDER BY start_time DESC;")
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