Megatest

(define (remote-request udata uconn rtype dbname prockey procparam data)
  (let* ((cookie    (make-cookie udata)))
    (send-receive udata uconn rtype cookie data `(,prockey procparam))))

(define (ulex-open-db udata dbname)
  #f)


;;======================================================================
;; Ulex db
;;
;;   - track who is captain, lease expire time
;;   - track who owns what db, lease
;;
;;======================================================================

;;
;;
(define (ulex-dbfname)
  (let ((dbdir (conc (get-environment-variable "HOME") "/.ulex")))
    (if (not (file-exists? dbdir))
	(create-directory dbdir #t))
    (conc dbdir "/network.db")))
	 
;; always goes in ~/.ulex/network.db
;; role is captain, adjutant, node
;;
(define (ulexdb-setup)
  (let* ((dbfname (ulex-dbfname))
	 (have-db (file-exists? dbfname))
	 (db      (sqlite3:open-database dbfname)))
    (sqlite3:set-busy-handler! db (sqlite3:make-busy-timeout 136000))
    (sqlite3:execute db "PRAGMA synchronous = 0;")
    (if (not have-db)
	(sqlite3:with-transaction
	 db
	 (lambda ()
	   (for-each
	    (lambda (stmt)
	      (if stmt (sqlite3:execute db stmt)))
	    `("CREATE TABLE IF NOT EXISTS nodes
                 (id INTEGER PRIMARY KEY,
                  role  TEXT NOT NULL,
                  host  TEXT NOT NULL,
                  port TEXT NOT NULL,
                  ipadr TEXT NOT NULL,
                  pid   INTEGER NOT NULL,
                  zcard TEXT NOT NULL,
                  regtime INTEGER DEFAULT (strftime('%s','now')),
                  lease_thru INTEGER DEFAULT (strftime('%s','now')),
                  last_update INTEGER DEFAULT (strftime('%s','now')));"
	      "CREATE TRIGGER  IF NOT EXISTS update_nodes_trigger AFTER UPDATE ON nodes
                             FOR EACH ROW
                               BEGIN 
                                 UPDATE nodes SET last_update=(strftime('%s','now'))
                                   WHERE id=old.id;
                               END;"
	      "CREATE TABLE IF NOT EXISTS dbs
                 (id INTEGER PRIMARY KEY,
                  dbname TEXT NOT NULL,
                  dbfile TEXT NOT NULL,
                  dbtype TEXT NOT NULL,
                  host_port TEXT NOT NULL,
                  regtime INTEGER DEFAULT (strftime('%s','now')),
                  lease_thru INTEGER DEFAULT (strftime('%s','now')),
                  last_update INTEGER DEFAULT (strftime('%s','now')));"
	      "CREATE TRIGGER  IF NOT EXISTS update_dbs_trigger AFTER UPDATE ON dbs
                             FOR EACH ROW
                               BEGIN 
                                 UPDATE dbs SET last_update=(strftime('%s','now'))
                                   WHERE id=old.id;
                               END;")))))
    db))

(define (get-host-port-lease db dbfname)
  (sqlite3:fold-row
   (lambda (rem host-port lease-thru)
     (list host-port lease-thru))
   #f db "SELECT host_port,lease_thru FROM dbs WHERE dbfile = ?" dbfname))
  
(define (register-captain db host ipadr port pid zcard #!key (lease 20))
  (let* ((dbfname (ulex-dbfname))
	 (host-port  (conc host ":" port)))
    (sqlite3:with-transaction
     db
     (lambda ()
       (match (get-host-port-lease db dbfname)
	 ((host-port lease-thru)
	  (if (> (current-seconds) lease-thru)
	      (begin
		(sqlite3:execute db "UPDATE dbs SET host_port=?,lease_thru=? WHERE dbname=?"
				 (conc host ":" port)
				 (+ (current-seconds) lease)
				 dbfname)
		#t)
	      #f))
	 (#f  (sqlite3:execute db "INSERT INTO dbs (dbname,dbfile,dbtype,host_port,lease_thru) VALUES (?,?,?,?,?)"
			       "captain" dbfname "captain" host-port (+ (current-seconds) lease)))
	 (else (print "ERROR: Unrecognised result from fold-row")
	       (exit 1)))))))
							    
;;======================================================================
;; network utilities
;;======================================================================

(define (rate-ip ipaddr)
  (regex-case ipaddr
    ( "^127\\..*" _ 0 )

    (sqlite3:set-busy-handler! db (sqlite3:make-busy-timeout 136000))
    (if (not dbexists)
	(init-proc db))
    db))


;;======================================================================
;; Previous Ulex db stuff
;;======================================================================

(define (ulexdb-init db inmem)
  (sqlite3:with-transaction
   db
   (lambda ()
     (for-each