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;; returns: db existed-prior-to-opening
;; RA => Returns a db handler; sets the lock if opened in writable mode
;;
;;(define *db-open-mutex* (make-mutex))
(define (db:lock-create-open fname initproc)
(let* ((parent-dir (or (pathname-directory fname)(current-directory))) ;; no parent? go local
(raw-fname (pathname-file fname))
(dir-writable (file-write-access? parent-dir))
(file-exists (file-exists? fname))
(file-write (if file-exists
(file-write-access? fname)
dir-writable )))
;;(mutex-lock! *db-open-mutex*) ;; tried this mutex, not clear it helped.
(if file-write ;; dir-writable
(condition-case
(let* ((lockfname (conc fname ".lock"))
(readyfname (conc parent-dir "/.ready-" raw-fname))
(readyexists (file-exists? readyfname)))
(if (not readyexists)
(common:simple-file-lock-and-wait lockfname))
(let ((db (sqlite3:open-database fname)))
(sqlite3:set-busy-handler! db (make-busy-timeout 136000))
(sqlite3:execute db "PRAGMA synchronous = 0;")
(if (not file-exists)
(begin
(if (and (configf:lookup *configdat* "setup" "use-wal")
(string-match "^/tmp/.*" fname)) ;; this is a file in /tmp
(sqlite3:execute db "PRAGMA journal_mode=WAL;")
(print "Creating " fname " in NON-WAL mode."))
(initproc db)))
db)
(exn (io-error) (debug:print 0 *default-log-port* "ERROR: i/o error with " fname ". Check permissions, disk space etc. and try again."))
(exn (corrupt) (debug:print 0 *default-log-port* "ERROR: database " fname " is corrupt. Repair it to proceed."))
(exn (busy) (debug:print 0 *default-log-port* "ERROR: database " fname " is locked. Try copying to another location, remove original and copy back."))
(exn (permission)(debug:print 0 *default-log-port* "ERROR: database " fname " has some permissions problem."))
(exn () (debug:print 0 *default-log-port* "ERROR: Unknown error with database " fname " message: " ((condition-property-accessor 'exn 'message) exn))))
(begin
(debug:print 2 *default-log-port* "WARNING: opening db in non-writable dir " fname)
(let ((db (sqlite3:open-database fname)))
;;(mutex-unlock! *db-open-mutex*)
db))
(exn (io-error) (debug:print 0 *default-log-port* "ERROR: i/o error with " fname ". Check permissions, disk space etc. and try again."))
(exn (corrupt) (debug:print 0 *default-log-port* "ERROR: database " fname " is corrupt. Repair it to proceed."))
(exn (busy) (debug:print 0 *default-log-port* "ERROR: database " fname " is locked. Try copying to another location, remove original and copy back."))
(exn (permission)(debug:print 0 *default-log-port* "ERROR: database " fname " has some permissions problem."))
(exn () (debug:print 0 *default-log-port* "ERROR: Unknown error with database " fname " message: " ((condition-property-accessor 'exn 'message) exn))))
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