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Comment:Improvements to sharing access to lock db in lock-queue
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SHA1: 96e9934cfa35bf83a91bd53aa8b1b8ba5b088462
User & Date: matt on 2014-11-04 22:44:00
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Context
2014-11-05
03:18
speculative fixes for lockdb issues and dead server connections (bug d33ba94) check-in: 85565c63a0 user: matt tags: v1.60, v1.6005_ww45.2
2014-11-04
22:44
Improvements to sharing access to lock db in lock-queue check-in: 96e9934cfa user: matt tags: v1.60
04:29
Cosmetics on newdashboard tests panel check-in: 52544327e3 user: matt tags: v1.60
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Modified lock-queue.scm from [31ed29958c] to [9d2a7c3661]. 

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;; Copyright 2006-2013, Matthew Welland.
;; 
;;  This program is made available under the GNU GPL version 2.0 or
;;  greater. See the accompanying file COPYING for details.
;; 
;;  This program is distributed WITHOUT ANY WARRANTY; without even the
;;  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
;;  PURPOSE.

;;======================================================================
;; launch a task - this runs on the originating host, tests themselves
;;
;;======================================================================

(use sqlite3 srfi-18)
(import (prefix sqlite3 sqlite3:))

(declare (unit lock-queue))
(declare (uses common))

;;======================================================================
;; attempt to prevent overlapping updates of rollup files by queueing
;; update requests in an sqlite db
;;======================================================================











(define (lock-queue:open-db fname #!key (count 10))
  (let* ((actualfname (conc fname ".lockdb"))
	 (dbexists (file-exists? actualfname))
	 (db       (sqlite3:open-database actualfname))
	 (handler  (make-busy-timeout 136000)))
    (if dbexists
	db
	(begin
	  (handle-exceptions
	   exn
	   (begin
	     (thread-sleep! 10)
	     (if (> count 0)
		 (lock-queue:open-db fname count: (- count 1))
		 db))
	   (sqlite3:with-transaction
	    db
	    (lambda ()
	      (sqlite3:execute 
	       db
	       "CREATE TABLE IF NOT EXISTS queue (
     	         id         INTEGER PRIMARY KEY,
                 test_id    INTEGER,
                 start_time INTEGER,
                 state      TEXT,
                 CONSTRAINT queue_constraint UNIQUE (test_id));")
	      (sqlite3:execute
	       db
	       "CREATE TABLE IF NOT EXISTS runlocks (
                 id         INTEGER PRIMARY KEY,
                 test_id    INTEGER,
                 run_lock   TEXT,
                 CONSTRAINT runlock_constraint UNIQUE (run_lock));"))))))
    (sqlite3:set-busy-handler! db handler)
    db))

(define (lock-queue:set-state db test-id newstate #!key (remtries 10))

  (handle-exceptions
   exn
   (if (> remtries 0)
       (begin
	 (debug:print 0 "WARNING: exception on lock-queue:set-state. Trying again in 30 seconds.")
	 (debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
	 (thread-sleep! 30)
	 (lock-queue:set-state db test-id newstate remtries: (- remtries 1)))
       (begin
	 (debug:print 0 "ERROR:  Failed to set lock state for test with id " test-id ", error: " ((condition-property-accessor 'exn 'message) exn) ", giving up.")
	 #f))
   (sqlite3:execute db "UPDATE queue SET state=? WHERE test_id=?;"
		    newstate
		    test-id)))

(define (lock-queue:any-younger? db mystart test-id #!key (remtries 10))

  (handle-exceptions
   exn
   (if (> remtries 0)
       (begin
	 (debug:print 0 "WARNING: exception on lock-queue:any-younger. Trying again in 30 seconds.")
	 (debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
	 (thread-sleep! 30)
	 (lock-queue:any-younger? db mystart test-id remtries: (- remtries 1)))
       (begin
	 (debug:print 0 "ERROR:  Failed to find younger locks for test with id " test-id ", error: " ((condition-property-accessor 'exn 'message) exn) ", giving up.")
	 #f))
   (let ((res #f))
     (sqlite3:for-each-row
      (lambda (tid)
	;; Actually this should not be needed as mystart cannot be simultaneously less than and test-id same as 
	(if (not (equal? tid test-id)) 
	    (set! res tid)))
      db
      "SELECT test_id FROM queue WHERE start_time > ?;" mystart)
     res)))

(define (lock-queue:get-lock db test-id #!key (count 10))

  (let ((res       #f)

	(lckqry    (sqlite3:prepare db "SELECT test_id,run_lock FROM runlocks WHERE run_lock='locked';"))
	(mklckqry  (sqlite3:prepare db "INSERT INTO runlocks (test_id,run_lock) VALUES (?,'locked');")))
    (let ((result 
	   (handle-exceptions
	    exn
	    (begin
	      (debug:print 0 "WARNING: failed to get queue lock. Will try again in a few seconds")
	      (debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
	      (thread-sleep! 10)
	      (if (> count 0)
		  (lock-queue:get-lock db test-id count: (- count 1)))
	      #f)
	    (sqlite3:with-transaction
	     db
	     (lambda ()
	       (sqlite3:for-each-row (lambda (tid lockstate)
				       (set! res (list tid lockstate)))
				     lckqry)
	       (if res
		   (if (equal? (car res) test-id)
		       #t ;; already have the lock
		       #f)
		   (begin
		     (sqlite3:execute mklckqry test-id)
		     ;; if no error handled then return #t for got the lock
		     #t)))))))
      (sqlite3:finalize! lckqry)
      (sqlite3:finalize! mklckqry)
      result)))

(define (lock-queue:release-lock fname test-id #!key (count 10))
  (let ((db (lock-queue:open-db fname)))
    (handle-exceptions
     exn
     (begin
       (debug:print 0 "WARNING: Failed to release queue lock. Will try again in few seconds")
       (debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
       (thread-sleep! 10)
       (if (> count 0)


	   (lock-queue:release-lock fname test-id count: (- count 1))
	   #f))
     (sqlite3:execute db "DELETE FROM runlocks WHERE test_id=?;" test-id)
     (sqlite3:finalize! db))))

(define (lock-queue:steal-lock db test-id #!key (count 10))


  (handle-exceptions
   exn
   (begin
     (debug:print 0 "WARNING: Failed to steal queue lock. Will try again in few seconds")
     (debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
     (thread-sleep! 10)
     (if (> count 0)
	 (lock-queue:steal-lock db test-id count: (- count 1))
	 #f))
   (sqlite3:execute db "DELETE FROM runlocks WHERE run_lock='locked';"))
  (lock-queue:get-lock db test-it))

;; returns #f if ok to skip the task
;; returns #t if ok to proceed with task
;; otherwise waits
;;
(define (lock-queue:wait-turn fname test-id #!key (count 10))
  (let ((db      (lock-queue:open-db fname))
	(mystart (current-seconds)))

    (handle-exceptions
     exn
     (begin
       (debug:print 0 "WARNING: Failed to find out if it is ok to skip the wait queue. Will try again in few seconds")
       (debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
       (thread-sleep! 10)
       (if (> count 0)


	   (lock-queue:wait-turn fname test-id count: (- count 1))
	   #f))

     (sqlite3:execute
      db
      "INSERT OR REPLACE INTO queue (test_id,start_time,state) VALUES (?,?,'waiting');"
      test-id mystart)
     (thread-sleep! 1) ;; give other tests a chance to register
     (let ((result 
	    (let loop ((younger-waiting (lock-queue:any-younger? db mystart test-id)))
	      (if younger-waiting
		  (begin
		    ;; no need for us to wait. mark in the lock queue db as skipping
		    (lock-queue:set-state db test-id "skipping")
		    #f) ;; let the calling process know that nothing needs to be done
		  (if (lock-queue:get-lock db test-id)
		      #t
		      (if (> (- (current-seconds) mystart) 36000) ;; waited too long, steal the lock
			  (lock-queue:steal-lock db test-id)
			  (begin
			    (thread-sleep! 1)
			    (loop (lock-queue:any-younger? db mystart test-id)))))))))
       (sqlite3:finalize! db)
       result))))
	  
            
;; (use trace)
;; (trace lock-queue:get-lock lock-queue:release-lock lock-queue:wait-turn lock-queue:any-younger? lock-queue:set-state)










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;; Copyright 2006-2013, Matthew Welland.
;; 
;;  This program is made available under the GNU GPL version 2.0 or
;;  greater. See the accompanying file COPYING for details.
;; 
;;  This program is distributed WITHOUT ANY WARRANTY; without even the
;;  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
;;  PURPOSE.






(use sqlite3 srfi-18)
(import (prefix sqlite3 sqlite3:))

(declare (unit lock-queue))
(declare (uses common))

;;======================================================================
;; attempt to prevent overlapping updates of rollup files by queueing
;; update requests in an sqlite db
;;======================================================================

;;======================================================================
;; db record, <vector db path-to-db>
;;======================================================================

(define (make-lock-queue:db-dat)(make-vector 3))
(define-inline (lock-queue:db-dat-get-db        vec)    (vector-ref  vec 0))
(define-inline (lock-queue:db-dat-get-path      vec)    (vector-ref  vec 1))
(define-inline (lock-queue:db-dat-set-db!       vec val)(vector-set! vec 0 val))
(define-inline (lock-queue:db-dat-set-path!     vec val)(vector-set! vec 1 val))

(define (lock-queue:open-db fname #!key (count 10))
  (let* ((actualfname (conc fname ".lockdb"))
	 (dbexists (file-exists? actualfname))
	 (db       (sqlite3:open-database actualfname))
	 (handler  (make-busy-timeout 136000)))
    (if dbexists
	(vector db actualfname)
	(begin
	  (handle-exceptions
	   exn
	   (begin
	     (thread-sleep! 10)
	     (if (> count 0)
		 (lock-queue:open-db fname count: (- count 1))
		 (vector db actualfname)))
	   (sqlite3:with-transaction
	    db
	    (lambda ()
	      (sqlite3:execute 
	       db
	       "CREATE TABLE IF NOT EXISTS queue (
     	         id         INTEGER PRIMARY KEY,
                 test_id    INTEGER,
                 start_time INTEGER,
                 state      TEXT,
                 CONSTRAINT queue_constraint UNIQUE (test_id));")
	      (sqlite3:execute
	       db
	       "CREATE TABLE IF NOT EXISTS runlocks (
                 id         INTEGER PRIMARY KEY,
                 test_id    INTEGER,
                 run_lock   TEXT,
                 CONSTRAINT runlock_constraint UNIQUE (run_lock));"))))))
    (sqlite3:set-busy-handler! db handler)
    (vector db actualfname)))

(define (lock-queue:set-state dbdat test-id newstate #!key (remtries 10))
  (tasks:wait-on-journal (lock-queue:db-dat-get-path dbdat) 1200)
  (handle-exceptions
   exn
   (if (> remtries 0)
       (begin
	 (debug:print 0 "WARNING: exception on lock-queue:set-state. Trying again in 30 seconds.")
	 (debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
	 (thread-sleep! 30)
	 (lock-queue:set-state dbdat test-id newstate remtries: (- remtries 1)))
       (begin
	 (debug:print 0 "ERROR:  Failed to set lock state for test with id " test-id ", error: " ((condition-property-accessor 'exn 'message) exn) ", giving up.")
	 #f))
   (sqlite3:execute (lock-queue:db-dat-get-db dbdat) "UPDATE queue SET state=? WHERE test_id=?;"
		    newstate
		    test-id)))

(define (lock-queue:any-younger? dbdat mystart test-id #!key (remtries 10))
  (tasks:wait-on-journal (lock-queue:db-dat-get-path dbdat) 1200)
  (handle-exceptions
   exn
   (if (> remtries 0)
       (begin
	 (debug:print 0 "WARNING: exception on lock-queue:any-younger. Trying again in 30 seconds.")
	 (debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
	 (thread-sleep! 30)
	 (lock-queue:any-younger? dbdat mystart test-id remtries: (- remtries 1)))
       (begin
	 (debug:print 0 "ERROR:  Failed to find younger locks for test with id " test-id ", error: " ((condition-property-accessor 'exn 'message) exn) ", giving up.")
	 #f))
   (let ((res #f))
     (sqlite3:for-each-row
      (lambda (tid)
	;; Actually this should not be needed as mystart cannot be simultaneously less than and test-id same as 
	(if (not (equal? tid test-id)) 
	    (set! res tid)))
      (lock-queue:db-dat-get-db dbdat)
      "SELECT test_id FROM queue WHERE start_time > ?;" mystart)
     res)))

(define (lock-queue:get-lock dbdat test-id #!key (count 10))
  (tasks:wait-on-journal (lock-queue:db-dat-get-path dbdat) 1200 remove: #t waiting-msg "lock-queue:get-lock, waiting on journal")
  (let* ((res       #f)
	 (db        (lock-queue:db-dat-get-db dbdat))
	 (lckqry    (sqlite3:prepare db "SELECT test_id,run_lock FROM runlocks WHERE run_lock='locked';"))
	 (mklckqry  (sqlite3:prepare db "INSERT INTO runlocks (test_id,run_lock) VALUES (?,'locked');")))
    (let ((result 
	   (handle-exceptions
	    exn
	    (begin
	      (debug:print 0 "WARNING: failed to get queue lock. Will try again in a few seconds")
	      (debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
	      (thread-sleep! 10)
	      (if (> count 0)
		  (lock-queue:get-lock dbdat test-id count: (- count 1)))
	      #f)
	    (sqlite3:with-transaction
	     db
	     (lambda ()
	       (sqlite3:for-each-row (lambda (tid lockstate)
				       (set! res (list tid lockstate)))
				     lckqry)
	       (if res
		   (if (equal? (car res) test-id)
		       #t ;; already have the lock
		       #f)
		   (begin
		     (sqlite3:execute mklckqry test-id)
		     ;; if no error handled then return #t for got the lock
		     #t)))))))
      (sqlite3:finalize! lckqry)
      (sqlite3:finalize! mklckqry)
      result)))

(define (lock-queue:release-lock fname test-id #!key (count 10))
  (let* ((dbdat (lock-queue:open-db fname)))
    (handle-exceptions
     exn
     (begin
       (debug:print 0 "WARNING: Failed to release queue lock. Will try again in few seconds")
       (debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
       (thread-sleep! 10)
       (if (> count 0)
	   (begin
	     (sqlite3:finalize! (lock-queue:db-dat-get-db dbdat))
	     (lock-queue:release-lock fname test-id count: (- count 1)))
	   #f))
     (sqlite3:execute (lock-queue:db-dat-get-db dbdat) "DELETE FROM runlocks WHERE test_id=?;" test-id)
     (sqlite3:finalize! (lock-queue:db-dat-get-db dbdat)))))

(define (lock-queue:steal-lock dbdat test-id #!key (count 10))
  (debug:print-info 0 "Attempting to steal lock at " (lock-queue:db-dat-get-path dbdat))
  (tasks:wait-on-journal (lock-queue:db-dat-get-path dbdat) 1200 "lock-queue:steal-lock; waiting on journal")
  (handle-exceptions
   exn
   (begin
     (debug:print 0 "WARNING: Failed to steal queue lock. Will try again in few seconds")
     (debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
     (thread-sleep! 10)
     (if (> count 0)
	 (lock-queue:steal-lock dbdat test-id count: (- count 1))
	 #f))
   (sqlite3:execute (lock-queue:db-dat-get-db dbdat) "DELETE FROM runlocks WHERE run_lock='locked';"))
  (lock-queue:get-lock dbdat test-it))

;; returns #f if ok to skip the task
;; returns #t if ok to proceed with task
;; otherwise waits
;;
(define (lock-queue:wait-turn fname test-id #!key (count 10))
  (let* ((dbdat   (lock-queue:open-db fname))
	 (mystart (current-seconds))
	 (db      (lock-queue:db-dat-get-db dbdat)))
    (handle-exceptions
     exn
     (begin
       (debug:print 0 "WARNING: Failed to find out if it is ok to skip the wait queue. Will try again in few seconds")
       (debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
       (thread-sleep! 10)
       (if (> count 0)
	   (begin
	     (sqlite3:finalize! db)
	     (lock-queue:wait-turn fname test-id count: (- count 1)))
	   #f))
     (tasks:wait-on-journal (lock-queue:db-dat-get-path dbdat) 1200 waiting-msg: "lock-queue:wait-turn; waiting on journal file")
     (sqlite3:execute
      db
      "INSERT OR REPLACE INTO queue (test_id,start_time,state) VALUES (?,?,'waiting');"
      test-id mystart)
     (thread-sleep! 1) ;; give other tests a chance to register
     (let ((result 
	    (let loop ((younger-waiting (lock-queue:any-younger? dbdat mystart test-id)))
	      (if younger-waiting
		  (begin
		    ;; no need for us to wait. mark in the lock queue db as skipping
		    (lock-queue:set-state dbdat test-id "skipping")
		    #f) ;; let the calling process know that nothing needs to be done
		  (if (lock-queue:get-lock dbdat test-id)
		      #t
		      (if (> (- (current-seconds) mystart) 36000) ;; waited too long, steal the lock
			  (lock-queue:steal-lock dbdat test-id)
			  (begin
			    (thread-sleep! 1)
			    (loop (lock-queue:any-younger? dbdat mystart test-id)))))))))
       (sqlite3:finalize! db)
       result))))
	  
            
;; (use trace)
;; (trace lock-queue:get-lock lock-queue:release-lock lock-queue:wait-turn lock-queue:any-younger? lock-queue:set-state)

Modified tasks.scm from [e808e7265f] to [228564f2da].

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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))
  (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




	   (if (> count 0)
	       (begin
		 (thread-sleep! 1)
		 (loop (file-exists? fullpath)
		       (- count 1)))
	       (begin
		 (if remove (system (conc "rm -rf " path)))
		 #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")))








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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")))
︙︙

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