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(define (rmt:write-frequency-over-limit? cmd run-id)
(and (not (member cmd api:read-only-queries))
(let* ((tmprec (hash-table-ref/default *write-frequency* run-id #f))
(record (if tmprec tmprec
(let ((v (vector (current-seconds) 0)))
(hash-table-set! *write-frequency* run-id v)
v)))
(count (+ 1 (vector-ref record 1)))
(start (vector-ref record 0))
(count (+ 1 (safe-vector-ref record 1)))
(start (safe-vector-ref record 0))
(queries-per-second (/ (* count 1.0)
(max (- (current-seconds) start) 1))))
(vector-set! record 1 count)
(if (and (> count 10)
(> queries-per-second 10))
(begin
(debug:print-info 1 "db write rate too high, starting a server, count=" count " start=" start " run-id=" run-id " queries-per-second=" queries-per-second)
#t)
#f))))
(define (rmt:get-connection-info run-id)
(let ((cinfo (hash-table-ref/default *runremote* run-id #f)))
(if cinfo
cinfo
;; NB// can cache the answer for server running for 10 seconds ...
;; ;; (and (not (rmt:write-frequency-over-limit? cmd run-id))
(if (tasks:server-running-or-starting? (db:delay-if-busy (tasks:open-db)) run-id)
(client:setup run-id)
#f))))
;; (define (rmt:get-connection-info run-id)
;; (let ((cinfo (hash-table-ref/default *runremote* run-id #f)))
;; (if cinfo
;; cinfo
;; ;; NB// can cache the answer for server running for 10 seconds ...
;; ;; ;; (and (not (rmt:write-frequency-over-limit? cmd run-id))
;; ;; (if (tasks:server-running-or-starting? (db:delay-if-busy (tasks:open-db)) run-id)
;; ;; (begin
;; ;; (tasks:start-and-wait-for-server (db:delay-if-busy (tasks:open-db)) run-id)
;; (client:setup run-id))))
;; ;; #f))))
(define *send-receive-mutex* (make-mutex)) ;; should have separate mutex per run-id
(define (rmt:send-receive cmd rid params #!key (attemptnum 1)) ;; start attemptnum at 1 so the modulo below works as expected
;; clean out old connections
(mutex-lock! *db-multi-sync-mutex*)
(let ((expire-time (- (current-seconds) (server:get-timeout) 10))) ;; don't forget the 10 second margin
(for-each
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((nmsg)(nn-close (http-transport:server-dat-get-socket
(hash-table-ref *runremote* run-id)))))
(hash-table-delete! *runremote* run-id)))))
(hash-table-keys *runremote*)))
(mutex-unlock! *db-multi-sync-mutex*)
;; (mutex-lock! *send-receive-mutex*)
(let* ((run-id (if rid rid 0))
(connection-info (rmt:get-connection-info run-id)))
(connection-info (hash-table-ref/default *runremote* run-id #f))) ;; (rmt:get-connection-info run-id)))
;; the nmsg method does the encoding under the hood (the http method should be changed to do this also)
(if connection-info
;; use the server if have connection info
(let* ((dat (case *transport-type*
((http)(condition-case
(http-transport:client-api-send-receive run-id connection-info cmd params)
((commfail)
(tasks:kill-server-run-id run-id)
((commfail)(vector #f "communications fail"))
((exn)(vector #f "other fail"))))
(vector #f "communications fail"))
((exn)
(tasks:kill-server-run-id run-id)
(vector #f "other fail"))))
((nmsg)(condition-case
(nmsg-transport:client-api-send-receive run-id connection-info cmd params)
((timeout)(vector #f "timeout talking to server"))))
(else (exit))))
(success (if (vector? dat) (vector-ref dat 0) #f))
(res (if (vector? dat) (vector-ref dat 1) #f)))
(if (vector? connection-info)(http-transport:server-dat-update-last-access connection-info))
(success (if (vector? dat) (safe-vector-ref dat 0) #f))
(res (if (vector? dat) (safe-vector-ref dat 1) #f)))
(if (and connection-info (vector? connection-info))(http-transport:server-dat-update-last-access connection-info))
(if success
(begin
;; (mutex-unlock! *send-receive-mutex*)
;; all is well, return the result!
(case *transport-type*
((http) res) ;; (db:string->obj res))
((nmsg) res))) ;; (vector-ref res 1)))
((nmsg) res))) ;; (safe-vector-ref res 1)))
;; we had a connection but it is borked. clean up and reconnect
(begin ;; let ((new-connection-info (client:setup run-id)))
(debug:print 0 "WARNING: Communication failed, trying call to rmt:send-receive again.")
;; (case *transport-type*
;; ((nmsg)(nn-close (http-transport:server-dat-get-socket connection-info))))
(hash-table-delete! *runremote* run-id) ;; don't keep using the same connection
;; NOTE: killing server causes this process to block forever. No idea why. Dec 2.
;; (if (eq? (modulo attemptnum 5) 0)
;; (tasks:kill-server-run-id run-id tag: "api-send-receive-failed"))
;; (mutex-unlock! *send-receive-mutex*) ;; close the mutex here to allow other threads access to communications
(tasks:start-and-wait-for-server (tasks:open-db) run-id 15)
;; (nmsg-transport:client-api-send-receive run-id connection-info cmd param remtries: (- remtries 1))))))
;; no longer killing the server in http-transport:client-api-send-receive
;; may kill it here but what are the criteria?
;; start with three calls then kill server
;; (if (eq? attemptnum 3)(tasks:kill-server-run-id run-id))
;; (thread-sleep! 2)
;; (client:setup run-id) ;; client setup happens in rmt:get-connection-info
(client:setup run-id)
(thread-sleep! (random 5)) ;; give some time to settle and minimize collison?
;; (debug:print 0 "ERROR: Communication failed!")
;; (mutex-unlock! *send-receive-mutex*)
;; (exit)
(vector-set! stat-vec 0 (+ (vector-ref stat-vec 0) 1))
(vector-set! stat-vec 1 (+ (vector-ref stat-vec 1) duration))))
(vector-set! stat-vec 0 (+ (safe-vector-ref stat-vec 0) 1))
(vector-set! stat-vec 1 (+ (safe-vector-ref stat-vec 1) duration))))
(mutex-unlock! *db-stats-mutex*))
(define (rmt:print-db-stats)
(let ((fmtstr "~40a~7-d~9-d~20,2-f")) ;; "~20,2-f"
(debug:print 18 "DB Stats\n========")
(debug:print 18 (format #f "~40a~8a~10a~10a" "Cmd" "Count" "TotTime" "Avg"))
(for-each (lambda (cmd)
(let ((cmd-dat (hash-table-ref *db-stats* cmd)))
(debug:print 18 (format #f fmtstr cmd (vector-ref cmd-dat 0) (vector-ref cmd-dat 1) (/ (vector-ref cmd-dat 1)(vector-ref cmd-dat 0))))))
(debug:print 18 (format #f fmtstr cmd (safe-vector-ref cmd-dat 0) (safe-vector-ref cmd-dat 1) (/ (safe-vector-ref cmd-dat 1)(safe-vector-ref cmd-dat 0))))))
(sort (hash-table-keys *db-stats*)
(lambda (a b)
(> (vector-ref (hash-table-ref *db-stats* a) 0)
(vector-ref (hash-table-ref *db-stats* b) 0)))))))
(> (safe-vector-ref (hash-table-ref *db-stats* a) 0)
(safe-vector-ref (hash-table-ref *db-stats* b) 0)))))))
(define (rmt:get-max-query-average run-id)
(mutex-lock! *db-stats-mutex*)
(let* ((runkey (conc "run-id=" run-id " "))
(cmds (filter (lambda (x)
(substring-index runkey x))
(hash-table-keys *db-stats*)))
(res (if (null? cmds)
(cons 'none 0)
(let loop ((cmd (car cmds))
(tal (cdr cmds))
(max-cmd (car cmds))
(res 0))
(let* ((cmd-dat (hash-table-ref *db-stats* cmd))
(tot (vector-ref cmd-dat 0))
(curravg (/ (vector-ref cmd-dat 1) (vector-ref cmd-dat 0))) ;; count is never zero by construction
(tot (safe-vector-ref cmd-dat 0))
(curravg (/ (safe-vector-ref cmd-dat 1) (safe-vector-ref cmd-dat 0))) ;; count is never zero by construction
(currmax (max res curravg))
(newmax-cmd (if (> curravg res) cmd max-cmd)))
(if (null? tal)
(if (> tot 10)
(cons newmax-cmd currmax)
(cons 'none 0))
(loop (car tal)(cdr tal) newmax-cmd currmax)))))))
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(db (make-dbr:dbstruct path: dbdir local: #t)))
(set! *dbstruct-db* db)
db)))
(db-file-path (db:dbfile-path 0)))
;; (read-only (not (file-read-access? db-file-path)))
(let* ((start (current-milliseconds))
(resdat (api:execute-requests dbstruct-local (vector (symbol->string cmd) params)))
(res (vector-ref resdat 1))
(res (safe-vector-ref resdat 1))
(duration (- (current-milliseconds) start)))
(rmt:update-db-stats run-id cmd params duration)
;; mark this run as dirty if this was a write
(if (not (member cmd api:read-only-queries))
(let ((start-time (current-seconds)))
(mutex-lock! *db-multi-sync-mutex*)
;; (if (not (hash-table-ref/default *db-local-sync* run-id #f))
;; just set it every time. Is a write more expensive than a read and does it matter?
(hash-table-set! *db-local-sync* (or run-id 0) start-time) ;; the oldest "write"
(mutex-unlock! *db-multi-sync-mutex*)))
res)))
(define (rmt:send-receive-no-auto-client-setup connection-info cmd run-id params)
(let* ((run-id (if run-id run-id 0))
;; (jparams (db:obj->string params)) ;; (rmt:dat->json-str params))
(res (handle-exceptions
exn
#f
(http-transport:client-api-send-receive run-id connection-info cmd params))))
;; ((commfail) (vector #f "communications fail")))))
(if (and res (vector-ref res 0))
(if (and res (safe-vector-ref res 0))
res
#f)))
;; (db:string->obj (vector-ref dat 1))
;; (db:string->obj (safe-vector-ref dat 1))
;; (begin
;; (debug:print 0 "ERROR: rmt:send-receive-no-auto-client-setup failed, attempting to continue. Got " dat)
;; dat))))
;; Wrap json library for strings (why the ports crap in the first place?)
(define (rmt:dat->json-str dat)
(with-output-to-string
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