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To Artifact [3c212dbf03]:

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;;======================================================================

(define (tasks:open-db)
  (let* ((dbpath  (conc *toppath* "/monitor.db"))
	 (exists  (if (file-exists? dbpath)
		      ;; BUGGISHNESS: Remove this code in six months. Today is 11/13/2012
		      (if (< (file-change-time dbpath) 1352851396.0)


			  (begin (delete-file dbpath) #f)

			  #t) #t))

	 (mdb     (sqlite3:open-database dbpath)) ;; (never-give-up-open-db dbpath))
	 (handler (make-busy-timeout 36000)))
    (sqlite3:set-busy-handler! mdb handler)
    (sqlite3:execute mdb (conc "PRAGMA synchronous = 0;"))
    (if (not exists)
	(begin
	  (sqlite3:execute mdb "CREATE TABLE IF NOT EXISTS tasks_queue (id INTEGER PRIMARY KEY,








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;;======================================================================

(define (tasks:open-db)
  (let* ((dbpath  (conc *toppath* "/monitor.db"))
	 (exists  (if (file-exists? dbpath)
		      ;; BUGGISHNESS: Remove this code in six months. Today is 11/13/2012
		      (if (< (file-change-time dbpath) 1352851396.0)
			  (begin
			    (debug:print 0 "NOTE: removing old db file " dbpath)
			    (delete-file dbpath)
			    #f)
			  #t)
		      #f))
	 (mdb     (sqlite3:open-database dbpath)) ;; (never-give-up-open-db dbpath))
	 (handler (make-busy-timeout 36000)))
    (sqlite3:set-busy-handler! mdb handler)
    (sqlite3:execute mdb (conc "PRAGMA synchronous = 0;"))
    (if (not exists)
	(begin
	  (sqlite3:execute mdb "CREATE TABLE IF NOT EXISTS tasks_queue (id INTEGER PRIMARY KEY,
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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));")
	  (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)
  (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)
   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 "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)
	  (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))
    (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))
    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)
    (< heartbeat-delta 10)))









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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,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 pullport pubport priority state)
  (sqlite3:execute 
   mdb 
   "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) pullport pid)
   interface
   pullport
   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 (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 pullport
	  ;; (sqlite3:execute mdb "DELETE FROM servers 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 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 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)(pullport #f)(pid #f))
  (let* ((server-id  (if server-id 
			 server-id
			 (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"))
     mdb
     "SELECT id,hostname,interface,pullport,pubport,pid FROM servers WHERE state='live' AND mt_version=? ORDER BY start_time ASC LIMIT 1;" megatest-version)
    ;; (print "res=" res)
    (if (null? res) #f
	(let loop ((hed (car res))
		   (tal (cdr res)))
	  ;; (print "hed=" hed ", tal=" tal)








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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 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 state='live' AND mt_version=? ORDER BY start_time ASC LIMIT 1;" megatest-version)
    ;; (print "res=" res)
    (if (null? res) #f
	(let loop ((hed (car res))
		   (tal (cdr res)))
	  ;; (print "hed=" hed ", tal=" tal)
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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)))
     mdb
     "SELECT id,pid,hostname,interface,port,start_time,priority,state,mt_version FROM servers ORDER BY start_time DESC;")
    res))
       

;;======================================================================
;; Tasks and Task monitors
;;======================================================================









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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 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,pullport,pubport,start_time,priority,state,mt_version FROM servers ORDER BY start_time DESC;")
    res))
       

;;======================================================================
;; Tasks and Task monitors
;;======================================================================
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