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;;======================================================================
;; Copyright 2006-2013, Matthew Welland.
;; Copyright 2006-2016, 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.
;;======================================================================

;;======================================================================
;; Database access
;;======================================================================

;; dbstruct vector containing all the relevant dbs like main.db, megatest.db, run.db etc

(require-extension (srfi 18) extras tcp)
(use sqlite3 srfi-1 posix regex regex-case srfi-69 csv-xml s11n md5 message-digest base64 format dot-locking z3)
(require-extension (srfi 18) extras tcp) ;; RADT => use of require-extension?
(use sqlite3 srfi-1 posix regex regex-case srfi-69 csv-xml s11n md5 message-digest base64 format dot-locking z3 typed-records)
(import (prefix sqlite3 sqlite3:))
(import (prefix base64 base64:))
(import (prefix base64 base64:)) ;; RADT => prefix??

(declare (unit db))
(declare (uses common))
(declare (uses keys))
(declare (uses ods))
(declare (uses client))
(declare (uses mt))

(include "common_records.scm")
(include "db_records.scm")
(include "key_records.scm")
(include "run_records.scm")

(define *rundb-mutex* (make-mutex)) ;; prevent problems opening/closing rundb's
(define *number-of-writes* 0)
(define *number-non-write-queries* 0)

;;======================================================================
;;  R E C O R D S
;;======================================================================

(defstruct dbr:dbstruct 
  main
  strdb
  ((path #f)  : string)
  ((local #f) : boolean)
  rundb
  inmem
  mtime
  rtime 
  stime
  inuse
  refdb
  ((locdbs (make-hash-table)) : hash-table)
  olddb)

;;======================================================================
;; SQLITE3 HELPERS
;;======================================================================

(define (db:general-sqlite-error-dump exn stmt . params)
  (let ((err-status ((condition-property-accessor 'sqlite3 'status #f) exn)))
  (let ((err-status ((condition-property-accessor 'sqlite3 'status #f) exn))) ;; RADT ... how does this work?
    ;; check for (exn sqlite3) ((condition-property-accessor 'exn 'message) exn)
    (print "err-status: " err-status)
    (debug:print-error 0 *default-log-port* " query " stmt " failed, params: " params ", error: " ((condition-property-accessor 'exn 'message) exn))
    (print-call-chain (current-error-port))))

;; convert to -inline
;; convert to -inline 
;;
(define (db:first-result-default db stmt default . params)
  (handle-exceptions
   exn
   (let ((err-status ((condition-property-accessor 'sqlite3 'status #f) exn)))
     ;; check for (exn sqlite3) ((condition-property-accessor 'exn 'message) exn)
     (if (eq? err-status 'done)
	 default
	 (begin
	   (debug:print-error 0 *default-log-port* " query " stmt " failed, params: " params ", error: " ((condition-property-accessor 'exn 'message) exn))
	   (print-call-chain (current-error-port))
	   default)))
   (apply sqlite3:first-result db stmt params)))

;; Get/open a database
;;    if run-id => get run specific db
;;    if #f     => get main db
;;    if db already open - return inmem
;;    if db not open, open inmem, rundb and sync then return inmem
;;    inuse gets set automatically for rundb's
;;
(define (db:get-db dbstruct run-id)
(define (db:get-db dbstruct run-id) 
  (if (sqlite3:database? dbstruct) ;; pass sqlite3 databases on through
      dbstruct
      (begin
	(let ((dbdat (if (or (not run-id)
			     (eq? run-id 0))
			 (db:open-main dbstruct)
			 (db:open-rundb dbstruct run-id)
			 )))
	  dbdat))))

;; legacy handling of structure for managing db's. Refactor this into dbr:?
(define (db:dbdat-get-db dbdat)
  (if (pair? dbdat)
      (car dbdat)
      dbdat))

(define (db:dbdat-get-path dbdat)
  (if (pair? dbdat)
      (cdr dbdat)
      #f))

;; mod-read:
;;     'mod   modified data
;;     'read  read data
;; Locks the mutex and depending on 'mod or 'read passed, sets the last timestamp in dbstruct
;;
(define (db:done-with dbstruct run-id mod-read)
  (if (not (sqlite3:database? dbstruct))
      (begin
	(mutex-lock! *rundb-mutex*)
	(if (eq? mod-read 'mod)
	    (dbr:dbstruct-set-mtime! dbstruct (current-milliseconds))
	    (dbr:dbstruct-set-rtime! dbstruct (current-milliseconds)))
	(dbr:dbstruct-set-inuse! dbstruct #f)
	    (dbr:dbstruct-mtime-set! dbstruct (current-milliseconds))
	    (dbr:dbstruct-rtime-set! dbstruct (current-milliseconds)))
	(dbr:dbstruct-inuse-set! dbstruct #f)
	(mutex-unlock! *rundb-mutex*))))

;; (db:with-db dbstruct run-id sqlite3:exec "select blah from blaz;")
;; r/w is a flag to indicate if the db is modified by this query #t = yes, #f = no
;;
(define (db:with-db dbstruct run-id r/w proc . params)
  (let* ((dbdat (if (vector? dbstruct)
  (let* ((dbdat (if (dbr:dbstruct? dbstruct)
		    (db:get-db dbstruct run-id)
		    dbstruct)) ;; cheat, allow for passing in a dbdat
	 (db    (db:dbdat-get-db dbdat)))
	 (db    (db:dbdat-get-db dbdat))) 
    (db:delay-if-busy dbdat)
    (handle-exceptions
     exn
     (begin
       (debug:print-error 0 *default-log-port* "sqlite3 issue in db:with-db, dbstruct=" dbstruct ", run-id=" run-id ", proc=" proc ", params=" params " error: " ((condition-property-accessor 'exn 'message) exn))
       (print-call-chain (current-error-port)))
     (let ((res (apply proc db params)))
       (if (vector? dbstruct)(db:done-with dbstruct run-id r/w))
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;; ;;
;; (define (db:get-path dbstruct id)
;;   (let ((fdb (db:get-filedb dbstruct)))
;;     (filedb:get-path db id)))

;; NB// #f => return dbdir only
;;      (was planned to be;  zeroth db with name=main.db)
;; 
;; If run-id is #f return to create and retrieve the path where the db will live.
;;
(define (db:dbfile-path run-id)
  (let* ((dbdir           (db:get-dbdir))
	 (fname           (if run-id
			      (if (eq? run-id 0) "main.db" (conc run-id ".db"))
			      #f)))
    (handle-exceptions
     exn
     (begin
       (debug:print-error 0 *default-log-port* "Couldn't create path to " dbdir)
       (exit 1))
     (if (not (directory? dbdir))(create-directory dbdir #t)))
    (if fname
	(conc dbdir "/" fname)
	(conc dbdir "/" fname) 
	dbdir)))

;; Returns the database location as specified in config file
;;
(define (db:get-dbdir)
  (or (configf:lookup *configdat* "setup" "dbdir")
      (conc (configf:lookup *configdat* "setup" "linktree") "/.db")))
	       
(define (db:set-sync db)
  (let ((syncprag (configf:lookup *configdat* "setup" "sychronous")))
    (sqlite3:execute db (conc "PRAGMA synchronous = " (or syncprag 1) ";"))))
    (sqlite3:execute db (conc "PRAGMA synchronous = " (or syncprag 1) ";")))) 

;; open an sql database inside a file lock
;;
;; returns: db existed-prior-to-opening
;; RA => Returns a db handler; sets the lock if opened in writable mode
;;
(define (db:lock-create-open fname initproc)
  ;; (if (file-exists? fname)
  ;;     (let ((db (sqlite3:open-database fname)))
  ;;       (sqlite3:set-busy-handler! db (make-busy-timeout 136000))
  ;;       (db:set-sync db) ;; (sqlite3:execute db "PRAGMA synchronous = 0;")
  ;;       db)
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	(begin
	  (debug:print 2 *default-log-port* "WARNING: opening db in non-writable dir " fname)
	  (sqlite3:open-database fname))))) ;; )

;; This routine creates the db. It is only called if the db is not already opened
;; 
(define (db:open-rundb dbstruct run-id #!key (attemptnum 0)(do-not-open #f)) ;;  (conc *toppath* "/megatest.db") (car *configinfo*)))
  (let* ((local  (dbr:dbstruct-get-local dbstruct))
  (let* ((local  (dbr:dbstruct-local dbstruct))
	 (rdb    (if local
		     (dbr:dbstruct-get-localdb dbstruct run-id)
		     (dbr:dbstruct-get-inmem dbstruct)))) ;; (dbr:dbstruct-get-runrec dbstruct run-id 'inmem)))
		     (dbr:dbstruct-localdb dbstruct run-id)
		     (dbr:dbstruct-inmem dbstruct)))) ;; (dbr:dbstruct-runrec dbstruct run-id 'inmem)))
    (if (or rdb
	    do-not-open)
	rdb
	(begin
	  (mutex-lock! *rundb-mutex*)
	  (let* ((dbpath       (db:dbfile-path run-id)) ;; (conc toppath "/db/" run-id ".db"))
		 (dbexists     (file-exists? dbpath))
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				     (set! *megatest-db* db)
				     db)))
		 (write-access (file-write-access? dbpath))
		 ;; (handler      (make-busy-timeout 136000))
		 )
	    (if (and dbexists (not write-access))
		(set! *db-write-access* #f)) ;; only unset so other db's also can use this control
	    (dbr:dbstruct-set-rundb!  dbstruct (cons db dbpath))
	    (dbr:dbstruct-set-inuse!  dbstruct #t)
	    (dbr:dbstruct-set-olddb!  dbstruct olddb)
	    ;; (dbr:dbstruct-set-run-id! dbstruct run-id)
	    (dbr:dbstruct-rundb-set!  dbstruct (cons db dbpath))
	    (dbr:dbstruct-inuse-set!  dbstruct #t)
	    (dbr:dbstruct-olddb-set!  dbstruct olddb)
	    ;; (dbr:dbstruct-run-id-set! dbstruct run-id)
	    (mutex-unlock! *rundb-mutex*)
	    (if local
		(begin
		  (dbr:dbstruct-set-localdb! dbstruct run-id db) ;; (dbr:dbstruct-set-inmem! dbstruct db) ;; direct access ...
		  (dbr:dbstruct-localdb-set! dbstruct run-id db) ;; (dbr:dbstruct-inmem-set! dbstruct db) ;; direct access ...
		  db)
		(begin
		  (dbr:dbstruct-set-inmem!  dbstruct inmem)
		  (dbr:dbstruct-inmem-set!  dbstruct inmem)
		  ;; dec 14, 2014 - keep deleted records available. hunch is that they are needed for id placeholders
		  ;; (sqlite3:execute db "DELETE FROM tests WHERE state='DELETED';") ;; they just slow us down in this context
		  (db:sync-tables db:sync-tests-only db inmem)
		  (db:delay-if-busy refdb) ;; dbpath: (db:dbdat-get-path refdb)) ;; What does delaying here achieve? 
		  (dbr:dbstruct-set-refdb!  dbstruct refdb)
		  (dbr:dbstruct-refdb-set!  dbstruct refdb)
		  (db:sync-tables db:sync-tests-only inmem refdb) ;; use inmem as the reference, don't read again from db
		  ;; sync once more to deal with delays?
		  ;; (db:sync-tables db:sync-tests-only db inmem)
		  ;; (db:sync-tables db:sync-tests-only inmem refdb)
		  inmem)))))))

;; This routine creates the db. It is only called if the db is not already ls opened
;; This routine creates the db if not already present. It is only called if the db is not already ls opened
;;
(define (db:open-main dbstruct) ;;  (conc *toppath* "/megatest.db") (car *configinfo*)))
  (let ((mdb (dbr:dbstruct-get-main dbstruct)))
(define (db:open-main dbstruct) ;;  (conc *toppath* "/megatest.db") (car *configinfo*))) 
  (let ((mdb (dbr:dbstruct-main dbstruct))) ;; RA => Returns the first reference in dbstruct
    (if mdb
	mdb
	(begin
	  (mutex-lock! *rundb-mutex*)
	  (let* ((dbpath       (db:dbfile-path 0))
		 (dbexists     (file-exists? dbpath))
		 (db           (db:lock-create-open dbpath db:initialize-main-db))
		 (olddb        (db:open-megatest-db))
		 (write-access (file-write-access? dbpath))
		 (dbdat        (cons db dbpath)))
	    (if (and dbexists (not write-access))
		(set! *db-write-access* #f))
	    (dbr:dbstruct-set-main!   dbstruct dbdat)
	    (dbr:dbstruct-set-olddb!  dbstruct olddb) ;; olddb is already a (cons db path)
	    (dbr:dbstruct-main-set!   dbstruct dbdat)
	    (dbr:dbstruct-olddb-set!  dbstruct olddb) ;; olddb is already a (cons db path)
	    (mutex-unlock! *rundb-mutex*)
	    (if (and (not dbexists)
		     *db-write-access*) ;; did not have a prior db and do have write access
		(db:multi-db-sync #f 'old2new))  ;; migrate data from megatest.db automatically
	    dbdat)))))

;; Make the dbstruct, setup up auxillary db's and call for main db at least once
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    (if (and dbexists (not write-access))
	(set! *db-write-access* #f))
    (cons db dbpath)))

;; sync run to disk if touched
;;
(define (db:sync-touched dbstruct run-id #!key (force-sync #f))
  (let ((mtime  (dbr:dbstruct-get-mtime dbstruct))
	(stime  (dbr:dbstruct-get-stime dbstruct))
	(rundb  (dbr:dbstruct-get-rundb dbstruct))
	(inmem  (dbr:dbstruct-get-inmem dbstruct))
	(maindb (dbr:dbstruct-get-main  dbstruct))
	(refdb  (dbr:dbstruct-get-refdb dbstruct))
	(olddb  (dbr:dbstruct-get-olddb dbstruct))
	;; (runid  (dbr:dbstruct-get-run-id dbstruct))
  (let ((mtime  (dbr:dbstruct-mtime dbstruct))
	(stime  (dbr:dbstruct-stime dbstruct))
	(rundb  (dbr:dbstruct-rundb dbstruct))
	(inmem  (dbr:dbstruct-inmem dbstruct))
	(maindb (dbr:dbstruct-main  dbstruct))
	(refdb  (dbr:dbstruct-refdb dbstruct))
	(olddb  (dbr:dbstruct-olddb dbstruct))
	;; (runid  (dbr:dbstruct-run-id dbstruct))
	)
    (debug:print-info 4 *default-log-port* "Syncing for run-id: " run-id)
    ;; (mutex-lock! *http-mutex*)
    (if (eq? run-id 0)
	;; runid equal to 0 is main.db
	(if maindb
	    (if (or (not (number? mtime))
		    (not (number? stime))
		    (> mtime stime)
		    force-sync)
		(begin
		  (db:delay-if-busy maindb)
		  (db:delay-if-busy olddb)
		  (let ((num-synced (db:sync-tables (db:sync-main-list maindb) maindb olddb)))
		    (dbr:dbstruct-set-stime! dbstruct (current-milliseconds))
		    (dbr:dbstruct-stime-set! dbstruct (current-milliseconds))
		    num-synced)
		  0))
	    (begin
	      ;; this can occur when using local access (i.e. not in a server)
	      ;; need a flag to turn it off.
	      ;;
	      (debug:print 3 *default-log-port* "WARNING: call to sync main.db to megatest.db but main not initialized")
	      0))
	;; any other runid is a run
	(if (or (not (number? mtime))
		(not (number? stime))
		(> mtime stime)
		force-sync)
	    (begin
	      (db:delay-if-busy rundb)
	      (db:delay-if-busy olddb)
	      (dbr:dbstruct-set-stime! dbstruct (current-milliseconds))
	      (dbr:dbstruct-stime-set! dbstruct (current-milliseconds))
	      (let ((num-synced (db:sync-tables db:sync-tests-only inmem refdb rundb olddb)))
		;; (mutex-unlock! *http-mutex*)
		num-synced)
	      (begin
		;; (mutex-unlock! *http-mutex*)
		0))))))

(define (db:close-main dbstruct)
  (let ((maindb (dbr:dbstruct-get-main dbstruct)))
  (let ((maindb (dbr:dbstruct-main dbstruct)))
    (if maindb
	(begin
	  (sqlite3:finalize! (db:dbdat-get-db maindb))
	  (dbr:dbstruct-set-main! dbstruct #f)))))
	  (dbr:dbstruct-main-set! dbstruct #f)))))

(define (db:close-run-db dbstruct run-id)
  (let ((rdb (db:open-rundb dbstruct run-id do-not-open: #t)))
    (if (and rdb
	     (sqlite3:database? rdb))
	(begin
	  (sqlite3:finalize! rdb)
	  (dbr:dbstruct-set-localdb! dbstruct run-id #f)
	  (dbr:dbstruct-set-inmem! dbstruct #f)))))
	  (dbr:dbstruct-localdb-set! dbstruct run-id #f)
	  (dbr:dbstruct-inmem-set! dbstruct #f)))))

;; close all opened run-id dbs
(define (db:close-all dbstruct)
  ;; finalize main.db
  (db:sync-touched dbstruct 0 force-sync: #t)
  ;;(common:db-block-further-queries)
  ;; (mutex-lock! *db-sync-mutex*) ;; with this perhaps it isn't necessary to use the block-further-queries mechanism?

  (db:close-main dbstruct)
  
  (let ((locdbs (dbr:dbstruct-get-locdbs dbstruct)))
  (let ((locdbs (dbr:dbstruct-locdbs dbstruct)))
    (if (hash-table? locdbs)
	(for-each (lambda (run-id)
		    (db:close-run-db dbstruct run-id))
		  (hash-table-keys locdbs)))))

(define (db:open-inmem-db)
  (let* ((db      (sqlite3:open-database ":memory:"))
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	      (set! tot-count (+ tot-count count))
	      (if (> count 0)
		  (if should-print (debug:print 0 *default-log-port* (format #f "    ~10a ~5a" tblname count))))))
	  (sort (hash-table->alist numrecs)(lambda (a b)(> (cdr a)(cdr b))))))
       tot-count)))
   (mutex-unlock! *db-sync-mutex*)))


(define (db:patch-schema-rundb run-id frundb)
  ;;
  ;; remove this some time after September 2016 (added in version v1.6031
  ;;
  (for-each
   (lambda (table-name)
     (handle-exceptions
      exn
      (if (string-match ".*duplicate.*" ((condition-property-accessor 'exn 'message) exn))
          (debug:print 0 *default-log-port* "Column last_update already added to " table-name " table")
          (db:general-sqlite-error-dump exn "alter table " table-name " ..." #f "none"))
      (sqlite3:execute
       frundb
       (conc "ALTER TABLE " table-name " ADD COLUMN last_update INTEGER DEFAULT 0")))
     (sqlite3:execute
      frundb
      (conc "DROP TRIGGER IF EXISTS update_" table-name "_trigger;"))
     (sqlite3:execute
      frundb
      (conc "CREATE TRIGGER IF NOT EXISTS update_" table-name "_trigger AFTER UPDATE ON " table-name "
                             FOR EACH ROW
                               BEGIN 
                                 UPDATE " table-name " SET last_update=(strftime('%s','now'))
                                   WHERE id=old.id;
                               END;"))
     )
   '("tests" "test_steps" "test_data")))

(define (db:patch-schema-maindb run-id maindb)
  ;;
  ;; remove all these some time after september 2016 (added in v1.6031
  ;;
  (handle-exceptions
   exn
   (if (string-match ".*duplicate.*" ((condition-property-accessor 'exn 'message) exn))
       (debug:print 0 *default-log-port* "Column last_update already added to runs table")
       (db:general-sqlite-error-dump exn "alter table runs ..." run-id "none"))
   (sqlite3:execute
    maindb
    "ALTER TABLE runs ADD COLUMN last_update INTEGER DEFAULT 0"))
  ;; these schema changes don't need exception handling
  (sqlite3:execute
   maindb
   "CREATE TRIGGER IF NOT EXISTS update_runs_trigger AFTER UPDATE ON runs
                             FOR EACH ROW
                               BEGIN 
                                 UPDATE runs SET last_update=(strftime('%s','now'))
                                   WHERE id=old.id;
                               END;")
  (sqlite3:execute maindb "CREATE TABLE IF NOT EXISTS run_stats (
                              id     INTEGER PRIMARY KEY,
                              run_id INTEGER,
                              state  TEXT,
                              status TEXT,
                              count  INTEGER,
                              last_update INTEGER DEFAULT (strftime('%s','now')))")
  (sqlite3:execute maindb "CREATE TRIGGER  IF NOT EXISTS update_run_stats_trigger AFTER UPDATE ON run_stats
                             FOR EACH ROW
                               BEGIN 
                                 UPDATE run_stats SET last_update=(strftime('%s','now'))
                                   WHERE id=old.id;
                               END;"))

;; options:
;;
;;  'killservers  - kills all servers
;;  'dejunk       - removes junk records
;;  'adj-testids  - move test-ids into correct ranges
;;  'old2new      - sync megatest.db records to .db/{main,1,2 ...}.db
;;  'new2old      - sync .db/{main,1,2,3 ...}.db to megatest.db
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	  (for-each 
	   (lambda (run-id)
	     (db:delay-if-busy mtdb)
	     (let ((testrecs (db:get-all-tests-info-by-run-id mtdb run-id))
		   (dbstruct (if toppath (make-dbr:dbstruct path: toppath local: #t) #f)))
	       (debug:print 0 *default-log-port* "INFO: Propagating " (length testrecs) " records for run-id=" run-id " to run specific db")
	       (db:replace-test-records dbstruct run-id testrecs)
	       (sqlite3:finalize! (db:dbdat-get-db (dbr:dbstruct-get-rundb dbstruct)))))
	       (sqlite3:finalize! (db:dbdat-get-db (dbr:dbstruct-rundb dbstruct)))))
	   run-ids)))

    ;; now ensure all newdb data are synced to megatest.db
    ;; do not use the run-ids list passed in to the function
    ;;
    (if (member 'new2old options)
	(let* ((maindb      (make-dbr:dbstruct path: toppath local: #t))
	       (src-run-ids (if run-ids run-ids (db:get-all-run-ids (db:dbdat-get-db (db:get-db maindb 0)))))
	       (all-run-ids (sort (delete-duplicates (cons 0 src-run-ids)) <))
	       (count       1)
	       (total       (length all-run-ids))
	       (dead-runs  '()))
          ;; first fix schema if needed
	  (for-each
	   (lambda (run-id)
          (map
           (lambda (th)
             (thread-join! th))
           (map
            (lambda (run-id)
	     (debug:print 0 *default-log-port* "Processing run " (if (eq? run-id 0) " main.db " run-id) ", " count " of " total)
	     (set! count (+ count 1))
	     (let* ((fromdb (if toppath (make-dbr:dbstruct path: toppath local: #t) #f))
		    (frundb (db:dbdat-get-db (db:get-db fromdb run-id))))
              (thread-start! 
               (make-thread
                (lambda ()
                  (let* ((fromdb (if toppath (make-dbr:dbstruct path: toppath local: #t) #f))
                         (frundb (db:dbdat-get-db (db:get-db fromdb run-id))))
	       ;; (db:delay-if-busy frundb)
	       ;; (db:delay-if-busy mtdb)
	       ;; (db:clean-up frundb)
	       (if (eq? run-id 0)
		   (let ((maindb  (db:dbdat-get-db (db:get-db fromdb #f))))
                    (if (eq? run-id 0)
                        (let ((maindb  (db:dbdat-get-db (db:get-db fromdb #f))))
		     (db:sync-tables (db:sync-main-list dbstruct) (db:get-db fromdb #f) mtdb)
		     (set! dead-runs (db:clean-up-maindb (db:get-db fromdb #f)))
                          (db:patch-schema-maindb run-id maindb))
		     ;; 
		     ;; Feb 18, 2016: add field last_update to runs table
                        (db:patch-schema-rundb run-id frundb)))
		     ;;
		     ;; remove all these some time after september 2016 (added in v1.6031
		     ;;
		     (handle-exceptions
		      exn
		      (if (string-match ".*duplicate.*" ((condition-property-accessor 'exn 'message) exn))
			  (debug:print 0 *default-log-port* "Column last_update already added to runs table")
			  (db:general-sqlite-error-dump exn "alter table runs ..." run-id "none"))
                  (set! count (+ count 1))
                  (debug:print 0 *default-log-port* "Finished patching schema for " (if (eq? run-id 0) " main.db " (conc run-id ".db")) ", " count " of " total)))))
            all-run-ids))
		      (sqlite3:execute
		       maindb
          ;; Then sync and fix db's
		       "ALTER TABLE runs ADD COLUMN last_update INTEGER DEFAULT 0"))
		     ;; these schema changes don't need exception handling
		     (sqlite3:execute
		      maindb
          (set! count 0)
          (process-fork
           (lambda ()
             (map
		      "CREATE TRIGGER IF NOT EXISTS update_runs_trigger AFTER UPDATE ON runs
                             FOR EACH ROW
                               BEGIN 
                                 UPDATE runs SET last_update=(strftime('%s','now'))
                                   WHERE id=old.id;
                               END;")
		     (sqlite3:execute maindb "CREATE TABLE IF NOT EXISTS run_stats (
                              id     INTEGER PRIMARY KEY,
                              run_id INTEGER,
                              state  TEXT,
                              status TEXT,
                              count  INTEGER,
                              last_update INTEGER DEFAULT (strftime('%s','now')))")
		     (sqlite3:execute maindb "CREATE TRIGGER  IF NOT EXISTS update_run_stats_trigger AFTER UPDATE ON run_stats
              (lambda (th)
                (thread-join! th))
                             FOR EACH ROW
                               BEGIN 
                                 UPDATE run_stats SET last_update=(strftime('%s','now'))
                                   WHERE id=old.id;
              (map
               (lambda (run-id)
                 (thread-start! 
                  (make-thread
                   (lambda ()
                     (let* ((fromdb (if toppath (make-dbr:dbstruct path: toppath local: #t) #f))
                            (frundb (db:dbdat-get-db (db:get-db fromdb run-id))))
                       (if (eq? run-id 0)
                               END;")
		     )
		   (begin
		     ;; NB// must sync first to ensure deleted tests get marked as such in megatest.db
		     (db:sync-tables db:sync-tests-only (db:get-db fromdb run-id) mtdb)
		     (db:clean-up-rundb (db:get-db fromdb run-id))
                           (let ((maindb  (db:dbdat-get-db (db:get-db fromdb #f))))
                             (db:sync-tables (db:sync-main-list dbstruct) (db:get-db fromdb #f) mtdb)
                             (set! dead-runs (db:clean-up-maindb (db:get-db fromdb #f))))
                           (begin
                             ;; NB// must sync first to ensure deleted tests get marked as such in megatest.db
                             (db:sync-tables db:sync-tests-only (db:get-db fromdb run-id) mtdb)
                             (db:clean-up-rundb (db:get-db fromdb run-id)))))
		     ;;
		     ;; Feb 18, 2016: add field last_update to tests, test_steps and test_data
		     ;;
		     ;; remove this some time after September 2016 (added in version v1.6031
		     ;;
		     (for-each
                     (set! count (+ count 1))
		      (lambda (table-name)
			(handle-exceptions
			 exn
			 (if (string-match ".*duplicate.*" ((condition-property-accessor 'exn 'message) exn))
			     (debug:print 0 *default-log-port* "Column last_update already added to " table-name " table")
                     (debug:print 0 *default-log-port* "Finished clean up of "
			     (db:general-sqlite-error-dump exn "alter table " table-name " ..." #f "none"))
			 (sqlite3:execute
			  frundb
                                  (if (eq? run-id 0)
			  (conc "ALTER TABLE " table-name " ADD COLUMN last_update INTEGER DEFAULT 0")))
			(sqlite3:execute
			 frundb
			 (conc "DROP TRIGGER IF EXISTS update_" table-name "_trigger;"))
                                      " main.db " (conc run-id ".db")) ", " count " of " total)))))
			(sqlite3:execute
			 frundb
               all-run-ids))))
			 (conc "CREATE TRIGGER IF NOT EXISTS update_" table-name "_trigger AFTER UPDATE ON " table-name "
                             FOR EACH ROW
                               BEGIN 
                                 UPDATE " table-name " SET last_update=(strftime('%s','now'))
                                   WHERE id=old.id;
                               END;"))
			)

		      '("tests" "test_steps" "test_data"))))))
	   all-run-ids)
	  ;; removed deleted runs
          ;; removed deleted runs
	  (let ((dbdir (tasks:get-task-db-path)))
	    (for-each (lambda (run-id)
			(let ((fullname (conc dbdir "/" run-id ".db")))
			  (if (file-exists? fullname)
			      (begin
				(debug:print 0 *default-log-port* "Removing database file for deleted run " fullname)
				(delete-file fullname)))))
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;; Use: (db:get-value-by-header (db:get-header runinfo)(db:get-rows runinfo))
;;  to extract info from the structure returned
;;
(define (db:get-runs-by-patt dbstruct keys runnamepatt targpatt offset limit fields last-update) ;; test-name)
  (let* ((tmp      (runs:get-std-run-fields keys (or fields '("id" "runname" "state" "status" "owner" "event_time"))))
	 (keystr   (car tmp))
	 (header   (cadr tmp))
	 (res     '())
	 (key-patt "")
	 (runwildtype (if (substring-index "%" runnamepatt) "like" "glob"))
	 (qry-str  #f)
	 (keyvals  (if targpatt (keys:target->keyval keys targpatt) '())))
    (for-each (lambda (keyval)
		(let* ((key    (car keyval))
		       (patt   (cadr keyval))
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			       (conc " AND last_update >= " last-update " ")
			       " ")
			" ORDER BY event_time "
			(if limit  (conc " LIMIT " limit)   "")
			(if offset (conc " OFFSET " offset) "")
			";"))
    (debug:print-info 4 *default-log-port* "runs:get-runs-by-patt qry=" qry-str " " runnamepatt)
    (vector header 
            (reverse
    (db:with-db dbstruct #f #f ;; reads db, does not write to it.
		(lambda (db)
		  (sqlite3:for-each-row
		   (lambda (a . r)
		     (set! res (cons (list->vector (cons a r)) res)))
		   db
		   qry-str
		   runnamepatt)))
             (db:with-db dbstruct #f #f ;; reads db, does not write to it.
                         (lambda (db)
                           (sqlite3:fold-row
                            (lambda (res . r)
                              (cons (list->vector r) res))
                            '()
                            db
                            qry-str
                            runnamepatt)))))))
    (vector header res)))

;; use (get-value-by-header (db:get-header runinfo)(db:get-rows runinfo))
(define (db:get-run-info dbstruct run-id)
  ;;(if (hash-table-ref/default *run-info-cache* run-id #f)
  ;;    (hash-table-ref *run-info-cache* run-id)
  (let* ((dbdat     (db:get-db dbstruct #f))
	 (db        (db:dbdat-get-db dbdat))
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    ;; ((fs) obj)
    ((http fs)
     (string-substitute
      (regexp "=") "_"
      (base64:base64-encode 
       (z3:encode-buffer
	(with-output-to-string
	  (lambda ()(serialize obj)))))
	  (lambda ()(serialize obj))))) ;; BB: serialize - this is what causes problems between different builds of megatest communicating.  serialize is sensitive to binary image of mtest.
      #t))
    ((zmq nmsg)(with-output-to-string (lambda ()(serialize obj))))
    (else obj)))
    (else obj))) ;; rpc

(define (db:string->obj msg #!key (transport 'http))
  (case transport
    ;; ((fs) msg)
    ((http fs)
     (if (string? msg)
	 (with-input-from-string 
	     (z3:decode-buffer
	      (base64:base64-decode
	       (string-substitute 
		(regexp "_") "=" msg #t)))
	   (lambda ()(deserialize)))
	 (begin
	   (debug:print-error 0 *default-log-port* "reception failed. Received " msg " but cannot translate it.")
	   msg))) ;; crude reply for when things go awry
    ((zmq nmsg)(with-input-from-string msg (lambda ()(deserialize))))
    (else msg)))
    (else msg))) ;; rpc

(define (db:test-set-status-state dbstruct run-id test-id status state msg)
  (let ((dbdat  (db:get-db dbstruct run-id)))
    (if (member state '("LAUNCHED" "REMOTEHOSTSTART"))
	(db:general-call dbdat 'set-test-start-time (list test-id)))
    (if msg
	(db:general-call dbdat 'state-status-msg (list state status msg test-id))
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			   ;; this test is younger, store it in the hash
			   (hash-table-set! tests-hash full-testname testdat))))
		   results)
		  (if (null? tal)
		      (map cdr (hash-table->alist tests-hash)) ;; return a list of the most recent tests
		      (loop (car tal)(cdr tal))))))))))

;; Function recursively checks if <db>.journal exists; if yes means db busy; call itself after delayed interval
;; return the sqlite3 db handle if possible
;; 
(define (db:delay-if-busy dbdat #!key (count 6))
  (if (not (configf:lookup *configdat* "server" "delay-on-busy"))
  (if (not (configf:lookup *configdat* "server" "delay-on-busy")) 
      (and dbdat (db:dbdat-get-db dbdat))
      (if dbdat
	  (let* ((dbpath (db:dbdat-get-path dbdat))
		 (db     (db:dbdat-get-db   dbdat)) ;; we'll return this so (db:delay--if-busy can be called inline
		 (dbfj   (conc dbpath "-journal")))
	    (if (handle-exceptions
		 exn
		 (begin
		   (debug:print-info 0 *default-log-port* "WARNING: failed to test for existance of " dbfj)
		   (thread-sleep! 1)
		   (db:delay-if-busy count (- count 1)))
		   (db:delay-if-busy count (- count 1))) 
		 (file-exists? dbfj))
		(case count
		  ((6)
		   (thread-sleep! 0.2)
		   (db:delay-if-busy count: 5))
		  ((5)
		   (thread-sleep! 0.4)
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		   (db:delay-if-busy count: 1))
		  ((1)
		   (thread-sleep! 6.4)
		   (db:delay-if-busy count: 0))
		  (else
		   (debug:print-info 0 *default-log-port* "delaying db access due to high database load.")
		   (thread-sleep! 12.8))))
	    db)
	    db) 
	  "bogus result from db:delay-if-busy")))

(define (db:test-get-records-for-index-file dbstruct run-id test-name)
  (let ((res '()))
    (db:with-db
     dbstruct
     run-id