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|
;; (server:release-sync-lock)
;; (server:have-sync-lock?))
;; (else #f))))
;; moving this here as it needs access to db and cannot be in common.
;;
(define (server:get-bruteforce-syncer dbstruct #!key (fork-to-background #f))
(define (server:get-bruteforce-syncer dbstruct #!key (fork-to-background #f) (persist-until-sync #f))
(let* ((sqlite-exe (or (get-environment-variable "MT_SQLITE3_EXE"))) ;; defined in cfg.sh
(sync-log (or (args:get-arg "-sync-log") (conc *toppath* "/logs/sync-" (current-process-id) "-" (get-host-name) ".log")))
(tmp-area (common:get-db-tmp-area))
(tmp-db (conc tmp-area "/megatest.db"))
(staging-file (conc *toppath* "/.megatest.db"))
(mtdbfile (conc *toppath* "/megatest.db"))
(lockfile (conc tmp-db ".lock"))
(lockfile (common:get-sync-lock-filepath))
(sync-cmd-core (conc sqlite-exe" " tmp-db " .dump | "sqlite-exe" " staging-file "&>"sync-log))
(sync-cmd (if fork-to-background
(conc "/usr/bin/env NBFAKE_LOG="*toppath*"/logs/last-server-sync-"(current-process-id)".log nbfake "sync-cmd-core)
(conc "/usr/bin/env NBFAKE_LOG="*toppath*"/logs/last-server-sync-"(current-process-id)".log nbfake \""sync-cmd-core"\"")
sync-cmd-core))
(default-min-intersync-delay 2)
(min-intersync-delay (configf:lookup-number *configdat* "server" "minimum-intersync-delay" default: 30))
(min-intersync-delay (configf:lookup-number *configdat* "server" "minimum-intersync-delay" default: default-min-intersync-delay))
(default-duty-cycle 0.1)
(duty-cycle (configf:lookup-number *configdat* "server" "sync-duty-cycle" default: default-duty-cycle))
(last-sync-seconds 10) ;; we will adjust this to a measurement and delay last-sync-seconds * (1 - duty-cycle)
(calculate-off-time (lambda (work-duration duty-cycle)
(* (/ (- 1 duty-cycle) duty-cycle) last-sync-seconds)))
(off-time min-intersync-delay)
(off-time min-intersync-delay) ;; adjusted in closure below.
(do-a-sync
(lambda ()
(BB> "Start do-a-sync with fork-to-background="fork-to-background" persist-until-sync="persist-until-sync)
(let* ((finalres
(let retry-loop ((num-tries 0))
(if (common:simple-file-lock lockfile)
(begin
(if (not fork-to-background)
(thread-sleep! (max off-time min-intersync-delay)))
(if (not (configf:lookup *configdat* "server" "disable-db-snapshot"))
(common:snapshot-file mtdbfile subdir: ".db-snapshot"))
(delete-file* staging-file)
(let* ((start-time (current-milliseconds))
(res (system sync-cmd))
(res2
(cond
((eq? 0 res)
(delete-file* (conc mtdbfile ".backup"))
(if (eq? 0 (file-size sync-log))
(delete-file sync-log))
(system (conc "/bin/mv " staging-file " " mtdbfile))
(set! last-sync-seconds (/ (- (current-milliseconds) start-time) 1000))
(set! off-time (calculate-off-time
last-sync-seconds
(cond
((and (number? duty-cycle) (> duty-cycle 0) (< duty-cycle 1))
duty-cycle)
(else
(debug:print 0 *default-log-port* "WARNING: ["(common:human-time)"] server.sync-duty-cycle is invalid. Should be a number between 0 and 1, but "duty-cycle" was specified. Using default value: "default-duty-cycle)
default-duty-cycle))))
(debug:print 1 *default-log-port* "INFO: ["(common:human-time)"] pid="(current-process-id)" SYNC took "last-sync-seconds" sec")
'sync-completed)
(else
(system (conc "/bin/cp "sync-log" "sync-log".fail"))
(debug:print 0 *default-log-port* "ERROR: ["(common:human-time)"] Sync failed. See log at "sync-log".fail")
(if (file-exists? (conc mtdbfile ".backup"))
(system (conc "/bin/cp "mtdbfile ".backup " mtdbfile)))
#f)))
(common:simple-file-release-lock lockfile)
res2)))
;; else
(debug:print 1 *default-log-port* "INFO: ["(common:human-time)"] pid="(current-process-id)" other SYNC in progress; not syncing.")
'parallel-sync
) ;; end if got lockfile
(if (common:simple-file-lock lockfile)
(begin
(cond
((not (or fork-to-background persist-until-sync))
(debug:print 0 *default-log-port* "INFO: syncer thread sleeping for max of (server.minimum-intersync-delay="min-intersync-delay
" , off-time="off-time" seconds ]")
(thread-sleep! (max off-time min-intersync-delay)))
(else
(debug:print 0 *default-log-port* "INFO: syncer thread NOT sleeping ; maybe time-to-exit...")))
(if (not (configf:lookup *configdat* "server" "disable-db-snapshot"))
(common:snapshot-file mtdbfile subdir: ".db-snapshot"))
(delete-file* staging-file)
(let* ((start-time (current-milliseconds))
(res (system sync-cmd))
(res2
(cond
((eq? 0 res)
(delete-file* (conc mtdbfile ".backup"))
(if (eq? 0 (file-size sync-log))
(delete-file sync-log))
(system (conc "/bin/mv " staging-file " " mtdbfile))
(set! last-sync-seconds (/ (- (current-milliseconds) start-time) 1000))
(set! off-time (calculate-off-time
last-sync-seconds
(cond
((and (number? duty-cycle) (> duty-cycle 0) (< duty-cycle 1))
duty-cycle)
(else
(debug:print 0 *default-log-port* "WARNING: ["(common:human-time)"] server.sync-duty-cycle is invalid. Should be a number between 0 and 1, but "duty-cycle" was specified. Using default value: "default-duty-cycle)
default-duty-cycle))))
(debug:print 1 *default-log-port* "INFO: ["(common:human-time)"] pid="(current-process-id)" SYNC took "last-sync-seconds" sec")
(debug:print 1 *default-log-port* "INFO: ["(common:human-time)"] pid="(current-process-id)" SYNC took "last-sync-seconds" sec ; with duty-cycle of "duty-cycle" off time is now "off-time)
'sync-completed)
(else
(system (conc "/bin/cp "sync-log" "sync-log".fail"))
(debug:print 0 *default-log-port* "ERROR: ["(common:human-time)"] Sync failed. See log at "sync-log".fail")
(if (file-exists? (conc mtdbfile ".backup"))
(system (conc "/bin/cp "mtdbfile ".backup " mtdbfile)))
#f))))
(common:simple-file-release-lock lockfile)
(BB> "released lockfile: " lockfile)
(when (common:file-exists? lockfile)
(BB> "DID NOT ACTUALLY RELEASE LOCKFILE"))
res2) ;; end let
);; end begin
;; else
(cond
(persist-until-sync
(thread-sleep! 1)
(debug:print 1 *default-log-port* "INFO: ["(common:human-time)"] pid="(current-process-id)" other SYNC in progress; we're in a fork-to-background so we need to succeed. Let's wait a jiffy and and try again. num-tries="num-tries" (waiting for lockfile="lockfile" to disappear)")
(retry-loop (add1 num-tries)))
(else
(debug:print 1 *default-log-port* "INFO: ["(common:human-time)"] pid="(current-process-id)" other SYNC in progress; not syncing.")
'parallel-sync-in-progress))
) ;; end if got lockfile
)
))
(BB> "End do-a-sync with fork-to-background="fork-to-background" persist-until-sync="persist-until-sync" and result="finalres)
finalres)
) ;; end lambda
))
do-a-sync))
(let* ((do-a-sync (server:get-bruteforce-syncer dbstruct)))
(if (and (not (args:get-arg "-sync-to-megatest.db")) ;; conditions under which we do not run the sync
(args:get-arg "-server"))
(final-sync (server:get-bruteforce-syncer dbstruct persist-until-sync: #t)))
(when (and (not (args:get-arg "-sync-to-megatest.db")) ;; conditions under which we do not run the sync
(args:get-arg "-server"))
(let loop ()
(debug:print 0 *default-log-port* "INFO: syncer thread sleeping for server.minimum-intersync-delay seconds ["min-intersync-delay"]")
(do-a-sync)
;; keep going unless time to exit
;;
(if (not *time-to-exit*)
(let delay-loop ((count 0))
;;(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 (eq? count 0)
((server:get-bruteforce-syncer dbstruct fork-to-background: #t)))
(if (and (not *time-to-exit*)
(< count 6)) ;; was 11, changing to 4.
(begin
(thread-sleep! 1)
(delay-loop (+ count 1))))
(if (not *time-to-exit*) (loop))))
;; time to exit, close the no-sync db here
;; (db:no-sync-close-db no-sync-db)
(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)
))))))
(define (server:old-writable-watchdog dbstruct)
(thread-sleep! 10) ;; delay for startup
(let* ((sqlite-exe (or (get-environment-variable "MT_SQLITE3_EXE"))) ;; defined in cfg.sh
(sync-log (or (args:get-arg "-sync-log") (conc *toppath* "/logs/sync-" (current-process-id) "-" (get-host-name) ".log")))
(tmp-area (common:get-db-tmp-area))
(tmp-db (conc tmp-area "/megatest.db"))
(staging-file (conc *toppath* "/.megatest.db"))
(mtdbfile (conc *toppath* "/megatest.db"))
(lockfile (conc tmp-db ".lock"))
(sync-cmd (conc sqlite-exe" " tmp-db " .dump | "sqlite-exe" " staging-file "&>"sync-log))
(min-intersync-delay (configf:lookup-number *configdat* "server" "minimum-intersync-delay" default: 30))
(default-duty-cycle 0.9)
(duty-cycle (configf:lookup-number *configdat* "server" "sync-duty-cycle" default: default-duty-cycle))
(last-sync-seconds 10) ;; we will adjust this to a measurement and delay last-sync-seconds * (1 - duty-cycle)
(calculate-off-time (lambda (work-duration duty-cycle)
(* (/ (- 1 duty-cycle) duty-cycle) last-sync-seconds)))
(off-time min-intersync-delay)
(do-a-sync
(lambda ()
(if (common:simple-file-lock lockfile)
(begin
(if (not (configf:lookup *configdat* "server" "disable-db-snapshot"))
(common:snapshot-file mtdbfile subdir: ".db-snapshot"))
(delete-file* staging-file)
(let* ((start-time (current-milliseconds))
(res (system sync-cmd)))
(cond
((eq? 0 res)
(delete-file* (conc mtdbfile ".backup"))
(if (eq? 0 (file-size sync-log))
(delete-file sync-log))
(system (conc "/bin/mv " staging-file " " mtdbfile))
(set! last-sync-seconds (/ (- (current-milliseconds) start-time) 1000))
(set! off-time (calculate-off-time
last-sync-seconds
(cond
((and (number? duty-cycle) (> duty-cycle 0) (< duty-cycle 1))
duty-cycle)
(else
(debug:print 0 *default-log-port* "WARNING: ["(common:human-time)"] server.sync-duty-cycle is invalid. Should be a number between 0 and 1, but "duty-cycle" was specified. Using default value: "default-duty-cycle)
default-duty-cycle))))
(debug:print 1 *default-log-port* "INFO: ["(common:human-time)"] pid="(current-process-id)" SYNC took "last-sync-seconds" sec")
#t)
(else
(system (conc "/bin/cp "sync-log" "sync-log".fail"))
(debug:print 0 *default-log-port* "ERROR: ["(common:human-time)"] Sync failed. See log at "sync-log".fail")
(if (file-exists? (conc mtdbfile ".backup"))
(system (conc "/bin/cp "mtdbfile ".backup " mtdbfile)))))
(common:simple-file-release-lock lockfile)))
;; else
(debug:print 1 *default-log-port* "INFO: ["(common:human-time)"] pid="(current-process-id)" other SYNC in progress; not syncing.")
) ;; end if got lockfile
) ;; end lambda
))
(if (and (not (args:get-arg "-sync-to-megatest.db")) ;; conditions under which we do not run the sync
(args:get-arg "-server"))
(let loop ()
(debug:print 0 *default-log-port* "INFO: syncer thread sleeping for server.minimum-intersync-delay seconds ["min-intersync-delay"]")
(thread-sleep! (max off-time min-intersync-delay))
(do-a-sync)
;; keep going unless time to exit
;;
(if (not *time-to-exit*)
(let delay-loop ((count 0))
;;(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 (eq? count 0)
(do-a-sync))
(if (and (not *time-to-exit*)
(< count 6)) ;; was 11, changing to 4.
(begin
(thread-sleep! 1)
(delay-loop (+ count 1))))
(if (not *time-to-exit*) (loop))))
;; time to exit, close the no-sync db here
;; (db:no-sync-close-db no-sync-db)
(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)
))))))
;; (let ((legacy-sync (common:run-sync?)))
;; (sync-stale-seconds (configf:lookup-number *configdat* "server" "sync-stale-seconds" default: 300))
;; (debug-mode (debug:debug-mode 1))
;; (last-time (current-seconds))
;; (no-sync-db (db:open-no-sync-db))
;; (sync-duration 0) ;; run time of the sync in milliseconds
;; ;;(this-wd-num (begin (mutex-lock! *wdnum*mutex) (let ((x *wdnum*)) (set! *wdnum* (add1 *wdnum*)) (mutex-unlock! *wdnum*mutex) x)))
;; )
;; (set! *no-sync-db* no-sync-db) ;; make the no sync db available to api calls
;; (debug:print-info 2 *default-log-port* "Periodic sync thread started.")
;; (debug:print-info 3 *default-log-port* "watchdog starting. legacy-sync is " legacy-sync" pid="(current-process-id) );; " this-wd-num="this-wd-num)
;; (if (and legacy-sync (not *time-to-exit*))
;; (let* (;;(dbstruct (db:setup))
;; (mtdb (dbr:dbstruct-mtdb dbstruct))
;; (mtpath (db:dbdat-get-path mtdb))
;; (tmp-area (common:get-db-tmp-area))
;; (lockfile (conc tmp-area "/megatest.db.lock"))
;; (start-file (conc tmp-area "/.start-sync"))
;; (end-file (conc tmp-area "/.end-sync")))
;; (debug:print-info 0 *default-log-port* "Server running, periodic sync started.")
;; (let loop ()
;; ;; sync for filesystem local db writes
;; ;;
;;
;; (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*)
;;
;; (min-intersync-delay (configf:lookup-number *configdat* "server" "minimum-intersync-delay" default: 5))
;; (should-sync (and (not *time-to-exit*)
;; (> (- (current-seconds) *db-last-sync*) min-intersync-delay))) ;; sync every five seconds minimum, deprecated logic, can probably be removed
;; (start-time (current-seconds))
;; (cpu-load-adj (alist-ref 'adj-proc-load (common:get-normalized-cpu-load #f)))
;; (mt-mod-time (file-modification-time mtpath))
;; (last-sync-start (if (common:file-exists? start-file)
;; (file-modification-time start-file)
;; 0))
;; (last-sync-end (if (common:file-exists? end-file)
;; (file-modification-time end-file)
;; 10))
;; (sync-period (+ 3 (* cpu-load-adj 30))) ;; as adjusted load increases increase the sync period
;; (recently-synced (and (< (- start-time mt-mod-time) sync-period) ;; not useful if sync didn't modify megatest.db!
;; (< mt-mod-time last-sync-start)))
;; (sync-done (<= last-sync-start last-sync-end))
;; (sync-stale (> start-time (+ last-sync-start sync-stale-seconds)))
;; (will-sync-pre (and (not *time-to-exit*) ;; do not start a sync if we are in the process of exiting
;; have-lock?
;; (or need-sync should-sync)
;; (or sync-done sync-stale)
;; (not sync-in-progress)
;; (not recently-synced)))
;; (will-sync (if will-sync-pre
;; ;; delay get lock until we decide to sync
;; #t ;; (server:have-sync-lock?)
;; #f)))
;; ;; if another server is syncing, postpone sync
;; (if (and will-sync-pre (not will-sync))
;; (set! *db-last-sync* start-time))
;; (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
;; " sync-done=" sync-done " sync-period=" sync-period)
;; (if (and (> sync-period 5)
;; (common:low-noise-print 30 "sync-period"))
;; (debug:print-info 0 *default-log-port* "Increased sync period due to long sync times, sync took: " sync-period " seconds."))
;; ;; (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 (;; (max-sync-duration (configf:lookup-number *configdat* "server" "max-sync-duration")) ;; KEEPING THIS AVAILABLE BUT SHOULD NOT USE, I'M PRETTY SURE IT DOES NOT WORK!
;; (sync-start (current-milliseconds)))
;; (with-output-to-file start-file (lambda ()(print (current-process-id))))
;;
;; ;; put lock here
;;
;; ;; (if (or (not max-sync-duration)
;; ;; (< sync-duration max-sync-duration)) ;; NOTE: db:sync-to-megatest.db keeps track of time of last sync and syncs incrementally
;; (let ((res (db:sync-to-megatest.db dbstruct no-sync-db: no-sync-db))) ;; did we sync any data? If so need to set the db touched flag to keep the server alive
;; (set! sync-duration (- (current-milliseconds) sync-start))
;; (if (> res 0) ;; some records were transferred, keep the db alive
;; (begin
;; (mutex-lock! *heartbeat-mutex*)
;; (set! *db-last-access* (current-seconds))
;; (mutex-unlock! *heartbeat-mutex*)
;; (debug:print-info 0 *default-log-port* "sync called, " res " records transferred."))
;; (debug:print-info 2 *default-log-port* "sync called but zero records transferred")))))
;; ;; ;; TODO: factor this next routine out into a function
;; ;; (with-input-from-pipe ;; this should not block other threads but need to verify this
;; ;; (conc "megatest -sync-to-megatest.db -m testsuite:" (common:get-area-name) ":" *toppath*)
;; ;; (lambda ()
;; ;; (let loop ((inl (read-line))
;; ;; (res #f))
;; ;; (if (eof-object? inl)
;; ;; (begin
;; ;; (set! sync-duration (- (current-milliseconds) sync-start))
;; ;; (cond
;; ;; ((not res)
;; ;; (debug:print 0 *default-log-port* "ERROR: sync from /tmp db to megatest.db appears to have failed. Recommended that you stop your runs and run \"megatest -cleanup-db\""))
;; ;; ((> res 0)
;; ;; (mutex-lock! *heartbeat-mutex*)
;; ;; (set! *db-last-access* (current-seconds))
;; ;; (mutex-unlock! *heartbeat-mutex*))))
;; ;; (let ((num-synced (let ((matches (string-match "^Synced (\\d+).*$" inl)))
;; ;; (if matches
;; ;; (string->number (cadr matches))
;; ;; #f))))
;; ;; (loop (read-line)
;; ;; (or num-synced res))))))))))
;; (if will-sync
;; (begin
;; (mutex-lock! *db-multi-sync-mutex*)
;; (set! *db-sync-in-progress* #f)
;; (set! *db-last-sync* start-time)
;; (with-output-to-file end-file (lambda ()(print (current-process-id))))
;;
;; ;; release lock here
;; ;; (server:release-sync-lock)
;; (mutex-unlock! *db-multi-sync-mutex*)))
;; (if (and debug-mode
;; (> (- start-time last-time) 60))
;; (begin
;; (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))
;; ;;(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 6)) ;; was 11, changing to 4.
;; (begin
;; (thread-sleep! 1)
;; (delay-loop (+ count 1))))
;; (if (not *time-to-exit*) (loop))))
;; ;; time to exit, close the no-sync db here
;; (db:no-sync-close-db no-sync-db)
;; (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)))))))
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