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;; currently the primary job of the watchdog is to run the sync back to megatest.db from the db in /tmp
;; if we are on the homehost and we are a server (by definition we are on the homehost if we are a server)
;;
(define (common:readonly-watchdog dbstruct)
(thread-sleep! 0.05) ;; delay for startup
(BB> "common:readonly-watchdog entered.")
(debug:print-info 13 *default-log-port* "common:readonly-watchdog entered.")
;; sync megatest.db to /tmp/.../megatst.db
(let* ((sync-cool-off-duration 3)
(golden-mtdb (dbr:dbstruct-mtdb dbstruct))
(golden-mtpath (db:dbdat-get-path golden-mtdb))
(tmp-mtdb (dbr:dbstruct-tmpdb dbstruct))
(tmp-mtpath (db:dbdat-get-path tmp-mtdb)))
(debug:print-info 0 *default-log-port* "Read-only periodic sync thread started.")
(let loop ((last-sync-time 0))
(BB> "loop top tmp-mtpath="tmp-mtpath" golden-mtpath="golden-mtpath)
(debug:print-info 13 *default-log-port* "loop top tmp-mtpath="tmp-mtpath" golden-mtpath="golden-mtpath)
(let* ((duration-since-last-sync (- (current-seconds) last-sync-time)))
(BB> "duration-since-last-sync="duration-since-last-sync)
(debug:print-info 13 *default-log-port* "duration-since-last-sync="duration-since-last-sync)
(if (and (not *time-to-exit*)
(< duration-since-last-sync sync-cool-off-duration))
(thread-sleep! (- sync-cool-off-duration duration-since-last-sync)))
(if (not *time-to-exit*)
(let ((golden-mtdb-mtime (file-modification-time golden-mtpath))
(tmp-mtdb-mtime (file-modification-time tmp-mtpath)))
(if (> golden-mtdb-mtime tmp-mtdb-mtime)
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(mutex-lock! *db-multi-sync-mutex*)
(let* ((need-sync (>= *db-last-access* *db-last-sync*)) ;; no sync since last write
(sync-in-progress *db-sync-in-progress*)
(should-sync (and (not *time-to-exit*)
(> (- (current-seconds) *db-last-sync*) 5))) ;; sync every five seconds minimum
(start-time (current-seconds))
(mt-mod-time (file-modification-time mtpath))
(recently-synced (> (- start-time mt-mod-time) 4))
(recently-synced (< (- start-time mt-mod-time) 4))
(will-sync (and (or need-sync should-sync)
(not sync-in-progress)
(not recently-synced))))
(debug:print-info 13 *default-log-port* "WD writable-watchdog top of loop. need-sync="need-sync" sync-in-progress="sync-in-progress" should-sync="should-sync" start-time="start-time" mt-mod-time="mt-mod-time" recently-synced="recently-synced" will-sync="will-sync)
;; (if recently-synced (debug:print-info 0 *default-log-port* "Skipping sync due to recently-synced flag=" recently-synced))
;; (debug:print-info 0 *default-log-port* "need-sync: " need-sync " sync-in-progress: " sync-in-progress " should-sync: " should-sync " will-sync: " will-sync)
(if will-sync (set! *db-sync-in-progress* #t))
(mutex-unlock! *db-multi-sync-mutex*)
(if will-sync
(let ((res (common:sync-to-megatest.db dbstruct))) ;; did we sync any data? If so need to set the db touched flag to keep the server alive
(if (> res 0) ;; some records were transferred, keep the db alive
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(set! last-time start-time)
(debug:print-info 4 *default-log-port* "timestamp -> " (seconds->time-string (current-seconds)) ", time since start -> " (seconds->hr-min-sec (- (current-seconds) *time-zero*))))))
;; keep going unless time to exit
;;
(if (not *time-to-exit*)
(let delay-loop ((count 0))
;;(BB> "delay-loop top; count="count" pid="(current-process-id)" this-wd-num="this-wd-num" *time-to-exit*="*time-to-exit*)
;;(debug:print-info 13 *default-log-port* "delay-loop top; count="count" pid="(current-process-id)" this-wd-num="this-wd-num" *time-to-exit*="*time-to-exit*)
(if (and (not *time-to-exit*)
(< count 4)) ;; was 11, changing to 4.
(begin
(thread-sleep! 1)
(delay-loop (+ count 1))))
(if (not *time-to-exit*) (loop))))
(if (common:low-noise-print 30)
(debug:print-info 0 *default-log-port* "Exiting watchdog timer, *time-to-exit* = " *time-to-exit*" pid="(current-process-id)" this-wd-num="this-wd-num)))))))
;; TODO: for multiple areas, we will have multiple watchdogs; and multiple threads to manage
(define (common:watchdog)
;;#t)
(BB> "common:watchdog entered.")
(debug:print-info 13 *default-log-port* "common:watchdog entered.")
(let ((dbstruct (db:setup)))
(BB> "after db:setup with dbstruct="dbstruct)
(debug:print-info 13 *default-log-port* "after db:setup with dbstruct="dbstruct)
(cond
((dbr:dbstruct-read-only dbstruct)
(BB> "loading read-only watchdog")
(debug:print-info 13 *default-log-port* "loading read-only watchdog")
(common:readonly-watchdog dbstruct))
(else
(BB> "loading writable-watchdog.")
(debug:print-info 13 *default-log-port* "loading writable-watchdog.")
(common:writable-watchdog dbstruct))))
(BB> "watchdog done.");;)
(debug:print-info 13 *default-log-port* "watchdog done.");;)
)
(define (std-exit-procedure)
(on-exit (lambda () 0))
;;(BB> "std-exit-procedure called; *time-to-exit*="*time-to-exit*)
;;(debug:print-info 13 *default-log-port* "std-exit-procedure called; *time-to-exit*="*time-to-exit*)
(let ((no-hurry (if *time-to-exit* ;; hurry up
#f
(begin
(set! *time-to-exit* #t)
#t))))
(debug:print-info 4 *default-log-port* "starting exit process, finalizing databases.")
(if (and no-hurry (debug:debug-mode 18))
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)
0)
(define (std-signal-handler signum)
;; (signal-mask! signum)
(set! *time-to-exit* #t)
;;(BB> "got signal "signum)
;;(debug:print-info 13 *default-log-port* "got signal "signum)
(debug:print-error 0 *default-log-port* "Received signal " signum " exiting promptly")
;; (std-exit-procedure) ;; shouldn't need this since we are exiting and it will be called anyway
(exit))
(set-signal-handler! signal/int std-signal-handler) ;; ^C
(set-signal-handler! signal/term std-signal-handler)
;; (set-signal-handler! signal/stop std-signal-handler) ;; ^Z NO, do NOT handle ^Z!
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