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(begin
(sqlite3:execute mdb "CREATE TABLE IF NOT EXISTS tasks_queue (id INTEGER PRIMARY KEY,
action TEXT DEFAULT '',
owner TEXT,
state TEXT DEFAULT 'new',
target TEXT DEFAULT '',
name TEXT DEFAULT '',
test TEXT DEFAULT '',
item TEXT DEFAULT '',
keylock TEXT,
params TEXT,
creation_time TIMESTAMP,
execution_time TIMESTAMP);")
(sqlite3:execute mdb "CREATE TABLE IF NOT EXISTS monitors (id INTEGER PRIMARY KEY,
pid INTEGER,
start_time TIMESTAMP,
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(begin
(sqlite3:execute mdb "CREATE TABLE IF NOT EXISTS tasks_queue (id INTEGER PRIMARY KEY,
action TEXT DEFAULT '',
owner TEXT,
state TEXT DEFAULT 'new',
target TEXT DEFAULT '',
name TEXT DEFAULT '',
testpatt TEXT DEFAULT '',
keylock TEXT,
params TEXT,
creation_time TIMESTAMP,
execution_time TIMESTAMP);")
(sqlite3:execute mdb "CREATE TABLE IF NOT EXISTS monitors (id INTEGER PRIMARY KEY,
pid INTEGER,
start_time TIMESTAMP,
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pubport INTEGER,
start_time TIMESTAMP,
priority INTEGER,
state TEXT,
mt_version TEXT,
heartbeat TIMESTAMP,
transport TEXT,
run_id INTEGER,
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,
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pubport INTEGER,
start_time TIMESTAMP,
priority INTEGER,
state TEXT,
mt_version TEXT,
heartbeat TIMESTAMP,
transport TEXT,
run_id INTEGER);")
;; 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,
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(define (tasks:hostinfo-get-interface vec) (vector-ref vec 1))
(define (tasks:hostinfo-get-port vec) (vector-ref vec 2))
(define (tasks:hostinfo-get-pubport vec) (vector-ref vec 3))
(define (tasks:hostinfo-get-transport vec) (vector-ref vec 4))
(define (tasks:hostinfo-get-pid vec) (vector-ref vec 5))
(define (tasks:hostinfo-get-hostname vec) (vector-ref vec 6))
;; state: 'live, 'shutting-down, 'dead
(define (tasks:server-register mdb pid interface port priority state transport #!key (pubport -1))
(debug:print-info 11 "tasks:server-register " pid " " interface " " port " " priority " " state)
"INSERT OR REPLACE INTO servers (pid,hostname,port,pubport,start_time,priority,state,mt_version,heartbeat,interface,transport)
VALUES(?, ?, ?, ?, strftime('%s','now'), ?, ?, ?, strftime('%s','now'),?,?);"
pid (get-host-name) port pubport priority (conc state)
(common:version-signature)
interface
(conc transport))
(vector
(tasks:server-get-server-id mdb (get-host-name) interface port pid)
interface
port
pubport
transport
))
;; 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 'delete))
(debug:print-info 11 "server-deregister " hostname ", port " port ", pid " pid)
(if *db-write-access*
(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 (interface=? or hostname=?) AND port=?;" hostname hostname port))
(else (sqlite3:execute mdb "UPDATE servers SET state='dead' WHERE (interface=? or hostname=?) AND port=?;" hostname 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)))
;; need a simple call for robustly removing records given host and port
(define (tasks:server-delete mdb hostname port)
(tasks:server-deregister mdb hostname port: port action: 'delete))
(define (tasks:server-get-server-id mdb hostname iface port pid)
(debug:print-info 12 "tasks:server-get-server-id " mdb " " hostname " " iface " " port " " pid)
(let ((res #f))
(lambda (id)
(set! res id))
mdb
(cond
((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))
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(define (tasks:hostinfo-get-interface vec) (vector-ref vec 1))
(define (tasks:hostinfo-get-port vec) (vector-ref vec 2))
(define (tasks:hostinfo-get-pubport vec) (vector-ref vec 3))
(define (tasks:hostinfo-get-transport vec) (vector-ref vec 4))
(define (tasks:hostinfo-get-pid vec) (vector-ref vec 5))
(define (tasks:hostinfo-get-hostname vec) (vector-ref vec 6))
(define (tasks:server-lock-slot mdb run-id)
(let ((res '())
(best #f))
(tasks:server-clean-out-old-records-for-run-id mdb run-id)
(tasks:server-set-available mdb run-id)
(thread-sleep! 2) ;; Try removing this. It may not be needed.
(tasks:server-am-i-the-server? mdb run-id)))
;; register that this server may come online (first to register goes though with the process)
(define (tasks:server-set-available mdb run-id)
(sqlite3:execute
mdb
"INSERT INTO servers (pid,hostname,port,pubport,start_time, priority,state,mt_version,heartbeat, interface,transport,run_id)
VALUES(?, ?, ?, ?, strftime('%s','now'), ?, ?, ?, strftime('%s','now'),?, ?, ?);"
(current-process-id) ;; pid
(get-host-name) ;; hostname
-1 ;; port
-1 ;; pubport
(random 1000) ;; priority (used a tiebreaker on get-available)
"available" ;; state
(common:version-signature) ;; mt_version
-1 ;; interface
"http" ;; transport
run-id
))
(define (tasks:server-clean-out-old-records-for-run-id mdb run-id)
(sqlite3:execute mdb "DELETE FROM servers WHERE state='available' AND (strftime('%s','now') - start_time) > 30 AND run_id=?;" run-id)
(sqlite3:execute mdb "DELETE FROM servers WHERE state='running' AND (strftime('%s','now') - heartbeat) > 10 AND run_id=?;" run-id))
(define (tasks:server-set-state! mdb server-id state)
(sqlite3:execute mdb "UPDATE servers SET state=? WHERE id=?;" state server-id))
(define (tasks:server-delete-record! mdb server-id)
(sqlite3:execute mdb "DELETE FROM servers WHERE id=?;" server-id))
(define (tasks:server-delete-records-for-this-pid mdb)
(sqlite3:execute mdb "DELETE FROM servers WHERE hostname=? AND pid=?;" (get-host-name) (current-process-id)))
(define (tasks:server-set-interface-port mdb server-id interface port)
(sqlite3:execute mdb "UPDATE servers SET interface=?,port=? WHERE id=?;" interface port server-id))
(define (tasks:server-am-i-the-server? mdb run-id)
(let* ((all (tasks:server-get-servers-vying-for-run-id mdb run-id))
(first (if (null? all)
(begin (debug:print 0 "ERROR: no servers listed, should be at least one by now.")
(sqlite3:finalize! mdb)
(exit 1))
(car (db:get-rows all))))
(header (db:get-header all))
(id (db:get-value-by-header first header "id"))
(hostname (db:get-value-by-header first header "hostname"))
(pid (db:get-value-by-header first header "pid"))
(priority (db:get-value-by-header first header "priority")))
(debug:print 0 "INFO: am-i-the-server got record " first)
;; for now a basic check. add tiebreaking by priority later
(if (and (equal? hostname (get-host-name))
(equal? pid (current-process-id)))
id
#f)))
;; Use: (db:get-value-by-header (car (db:get-rows dat)) (db:get-header dat) "fieldname")
;; to extract info from the structure returned
;;
(define (tasks:server-get-servers-vying-for-run-id mdb run-id)
(let* ((header (list "id" "hostname" "pid" "interface" "port" "pubport" "state" "run_id" "priority" "start_time"))
(selstr (string-intersperse header ","))
(res '()))
(sqlite3:for-each-row
(lambda (a . b)
(set! res (cons (apply vector a b) res)))
mdb
(conc "SELECT " selstr " FROM servers WHERE run_id=? ORDER BY start_time DESC;")
run-id)
(vector header res)))
(define (tasks:server-update-heartbeat mdb server-id)
(debug:print-info 1 "Heart beat update of server id=" server-id)
(handle-exceptions
exn
(begin
(debug:print 0 "WARNING: probable timeout on monitor.db access")
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(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 #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))
(define (tasks:get-logged-in-clients mdb server-id)
(let ((res '()))
(sqlite3:for-each-row
(lambda (id server-id pid hostname cmdline login-time logout-time)
(set! res (cons (vector id server-id pid hostname cmdline login-time lougout-time) res)))
mdb
"SELECT id,server_id,pid,hostname,cmdline,login_time,logout_time FROM clients WHERE server_id=?;"
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)
(let ((res '())
(best #f)
(transport (if (and *transport-type*
(not (eq? *transport-type* 'fs)))
(conc *transport-type*)
"%")))
(set! res (cons (vector id interface port pubport transport pid hostname) res))
;;(debug:print-info 2 "Found existing server " hostname ":" port " registered in db"))
)
mdb
AND mt_version=? AND transport LIKE ?
ORDER BY start_time DESC LIMIT 1;" (common:version-signature) transport)
;; for now we are keeping only one server registered in the db, return #f or first server found
(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:execute mdb "DELETE FROM servers;"))
(define (tasks:mark-server hostname port pid state transport)
(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)))
(define (tasks:kill-server status hostname port pid transport)
(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
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(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:get-server mdb run-id)
(let ((res #f)
(best #f))
(sqlite3:for-each-row
(lambda (id interface port pubport transport pid hostname)
(set! res (vector id interface port pubport transport pid hostname)))
mdb
"SELECT id,interface,port,pubport,transport,pid,hostname FROM servers
WHERE strftime('%s','now')-heartbeat < 10
AND mt_version=? AND run_id=? AND state='running'
ORDER BY start_time DESC LIMIT 1;" (common:version-signature) run-id)
res))
(define (tasks:kill-server status hostname port pid transport)
(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
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(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 pubport start-time priority state mt-version last-update transport)
(set! res (cons (vector id pid hostname interface port pubport start-time priority state mt-version last-update transport) res)))
mdb
"SELECT id,pid,hostname,interface,port,pubport,start_time,priority,state,mt_version,strftime('%s','now')-heartbeat AS last_update,transport FROM servers ORDER BY start_time DESC;")
res))
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(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))))))
;;======================================================================
;; Tasks and Task monitors
;;======================================================================
;;======================================================================
;; Tasks
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(set! res count))
mdb
"SELECT count(id) FROM monitors WHERE last_update < (strftime('%s','now') - 300) AND username=?;"
(car (user-information (current-user-id))))
res))
;; register a task
(define (tasks:add mdb action owner target runname test item params)
(sqlite3:execute mdb "INSERT INTO tasks_queue (action,owner,state,target,name,test,item,params,creation_time,execution_time)
VALUES (?,?,'new',?,?,?,?,?,strftime('%s','now'),0);"
action
owner
target
runname
test
item
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(set! res count))
mdb
"SELECT count(id) FROM monitors WHERE last_update < (strftime('%s','now') - 300) AND username=?;"
(car (user-information (current-user-id))))
res))
;; register a task
(define (tasks:add mdb action owner target runname testpatt params)
(sqlite3:execute mdb "INSERT INTO tasks_queue (action,owner,state,target,name,testpatt,params,creation_time,execution_time)
VALUES (?,?,'new',?,?,?,?,?,strftime('%s','now'),0);"
action
owner
target
runname
test
item
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