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;;======================================================================
;; Tasks db
;;======================================================================
;; wait up to aprox n seconds for a journal to go away
;;
(define (tasks:wait-on-journal path n #!key (remove #f)(waiting-msg #f))
(let ((fullpath (conc path "-journal")))
(handle-exceptions
exn
#t ;; if stuff goes wrong just allow it to move on
(let loop ((journal-exists (file-exists? fullpath))
(count n)) ;; wait ten times ...
(if journal-exists
(begin
(if (and waiting-msg
(eq? (modulo n 30) 0))
(debug:print 0 waiting-msg))
(if (> count 0)
(begin
(thread-sleep! 1)
(loop (file-exists? fullpath)
(- count 1)))
(begin
(if remove (system (conc "rm -rf " fullpath)))
#f)))
#t)))))
(define (tasks:get-task-db-path)
(if *task-db*
(vector-ref *task-db* 1)
(let* ((linktree (configf:lookup *configdat* "setup" "linktree"))
(dbpath (conc linktree "/.db/monitor.db")))
dbpath)))
(print-call-chain)
(debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
(print "exn=" (condition->list exn))
(thread-sleep! 1)
(tasks:open-db numretries (- numretries 1)))
(begin
(print-call-chain)
(debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
(print "exn=" (condition->list exn))))
(let* ((dbpath (tasks:get-task-db-path))
(avail (tasks:wait-on-journal dbpath 10)) ;; wait up to about 10 seconds for the journal to go away
(exists (file-exists? dbpath))
(write-access (file-write-access? dbpath))
(mdb (cond
((file-write-access? *toppath*)(sqlite3:open-database dbpath))
((file-read-access? dbpath) (sqlite3:open-database dbpath))
(else (sqlite3:open-database ":memory:")))) ;; (never-give-up-open-db dbpath))
(handler (make-busy-timeout 36000)))
(if (and exists
(not write-access))
(set! *db-write-access* write-access)) ;; only unset so other db's also can use this control
(sqlite3:set-busy-handler! mdb handler)
(db:set-sync mdb) ;; (sqlite3:execute mdb (conc "PRAGMA synchronous = 0;"))
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;;======================================================================
;; Tasks db
;;======================================================================
;; wait up to aprox n seconds for a journal to go away
;;
(define (tasks:wait-on-journal path n #!key (remove #f)(waiting-msg #f))
(if (not (string? path))
(debug:print 0 "ERROR: Called tasks:wait-on-journal with path=" path " (not a string)")
(let ((fullpath (conc path "-journal")))
(handle-exceptions
exn
#t ;; if stuff goes wrong just allow it to move on
(let loop ((journal-exists (file-exists? fullpath))
(count n)) ;; wait ten times ...
(if journal-exists
(begin
(if (and waiting-msg
(eq? (modulo n 30) 0))
(debug:print 0 waiting-msg))
(if (> count 0)
(begin
(thread-sleep! 1)
(loop (file-exists? fullpath)
(- count 1)))
(begin
(if remove (system (conc "rm -rf " fullpath)))
#f)))
#t))))))
(define (tasks:get-task-db-path)
(let* ((linktree (configf:lookup *configdat* "setup" "linktree"))
(dbpath (conc linktree "/.db")))
dbpath))
;; If file exists AND
;; file readable
;; ==> open it
;; If file exists AND
;; file NOT readable
;; ==> open in-mem version
;; If file NOT exists
;; ==> open in-mem version
;;
(define (tasks:open-db #!key (numretries 4))
(if *task-db*
*task-db*
(handle-exceptions
exn
(if (> numretries 0)
(begin
(print-call-chain (current-error-port))
(debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
(debug:print 0 " exn=" (condition->list exn))
(thread-sleep! 1)
(tasks:open-db numretries (- numretries 1)))
(begin
(print-call-chain (current-error-port))
(debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
(debug:print 0 " exn=" (condition->list exn))))
(let* ((dbpath (tasks:get-task-db-path))
(dbfile (conc dbpath "/monitor.db"))
(avail (tasks:wait-on-journal dbpath 10)) ;; wait up to about 10 seconds for the journal to go away
(exists (file-exists? dbpath))
(write-access (file-write-access? dbpath))
(mdb (cond ;; what the hek is *toppath* doing here?
((and (string? *toppath*)(file-write-access? *toppath*))
(sqlite3:open-database dbfile))
((file-read-access? dbpath) (sqlite3:open-database dbfile))
(else (sqlite3:open-database ":memory:")))) ;; (never-give-up-open-db dbpath))
(handler (make-busy-timeout 36000)))
(if (and exists
(not write-access))
(set! *db-write-access* write-access)) ;; only unset so other db's also can use this control
(sqlite3:set-busy-handler! mdb handler)
(db:set-sync mdb) ;; (sqlite3:execute mdb (conc "PRAGMA synchronous = 0;"))
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(best #f))
(handle-exceptions
exn
(begin
(debug:print 0 "WARNING: tasks:get-server db access error.")
(debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
(debug:print 0 " for run " run-id)
(print-call-chain)
(if (> retries 0)
(begin
(debug:print 0 " trying call to tasks:get-server again in 10 seconds")
(thread-sleep! 10)
(tasks:get-server mdb run-id retries: (- retries 0)))
(debug:print 0 "10 tries of tasks:get-server all crashed and burned. Giving up and returning \"no server found\"")))
(sqlite3:for-each-row
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(best #f))
(handle-exceptions
exn
(begin
(debug:print 0 "WARNING: tasks:get-server db access error.")
(debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
(debug:print 0 " for run " run-id)
(print-call-chain (current-error-port))
(if (> retries 0)
(begin
(debug:print 0 " trying call to tasks:get-server again in 10 seconds")
(thread-sleep! 10)
(tasks:get-server mdb run-id retries: (- retries 0)))
(debug:print 0 "10 tries of tasks:get-server all crashed and burned. Giving up and returning \"no server found\"")))
(sqlite3:for-each-row
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