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;; grep define ../rmt.scm | grep rmt: |perl -pi -e 's/\(define\s+\((\S+)\W.*$/\1/'|sort -u
;;======================================================================
;; S U P P O R T F U N C T I O N S
;;======================================================================
;;
(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))
(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 *default-log-port* "db write rate too high, starting a server, count=" count " start=" start " run-id=" run-id " queries-per-second=" queries-per-second)
#t)
#f))))
;; NB// can cache the answer for server running for 10 seconds ...
;; ;; (and (not (rmt:write-frequency-over-limit? cmd run-id))
(let ((expire-time (- (current-seconds) (server:get-timeout) 10))) ;; don't forget the 10 second margin
(for-each
(lambda (run-id)
(let ((connection (hash-table-ref/default *runremote* run-id #f)))
(if (and (vector? connection)
(< (http-transport:server-dat-get-last-access connection) expire-time))
(begin
(debug:print-info 0 *default-log-port* "Discarding connection to server for run-id " run-id ", too long between accesses")
;; bb- disabling nanomsg
;; SHOULD CLOSE THE CONNECTION HERE
;; (case *transport-type*
;; ((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)))
;; 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)(vector #f "communications fail"))
((exn)(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))
(if success
(begin
;; (mutex-unlock! *send-receive-mutex*)
(case *transport-type*
((http) res) ;; (db:string->obj res))
;; ((nmsg) res)
)) ;; (vector-ref res 1)))
(begin ;; let ((new-connection-info (client:setup run-id)))
(debug:print 0 *default-log-port* "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)
(rmt:send-receive cmd run-id params attemptnum: (+ attemptnum 1)))))
;; no connection info? try to start a server, or access locally if no
;; server and the query is read-only
;;
;; Note: The tasks db was checked for a server in starting mode in the rmt:get-connection-info call
;;
(if (and (< attemptnum 15)
(member cmd api:write-queries))
(let ((faststart (configf:lookup *configdat* "server" "faststart")))
(hash-table-delete! *runremote* run-id)
;; (mutex-unlock! *send-receive-mutex*)
(if (and faststart (equal? faststart "no"))
(begin
(tasks:start-and-wait-for-server (db:delay-if-busy (tasks:open-db)) run-id 10)
(thread-sleep! (random 5)) ;; give some time to settle and minimize collison?
(rmt:send-receive cmd rid params attemptnum: (+ attemptnum 1)))
(let ((start-time (current-milliseconds))
(max-query (string->number (or (configf:lookup *configdat* "server" "server-query-threshold")
"300")))
(newres (rmt:open-qry-close-locally cmd run-id params)))
(let ((delta (- (current-milliseconds) start-time)))
(if (> delta max-query)
(begin
(debug:print-info 0 *default-log-port* "Starting server as query time " delta " is over the limit of " max-query)
(server:kind-run run-id)))
;; return the result!
newres)
)))
(begin
;; (debug:print-error 0 *default-log-port* "Communication failed!")
;; (mutex-unlock! *send-receive-mutex*)
;; (exit)
(rmt:open-qry-close-locally cmd run-id params)
)))))
(define (rmt:update-db-stats run-id rawcmd params duration)
(mutex-lock! *db-stats-mutex*)
(handle-exceptions
exn
(begin
(debug:print 0 *default-log-port* "WARNING: stats collection failed in update-db-stats")
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;; grep define ../rmt.scm | grep rmt: |perl -pi -e 's/\(define\s+\((\S+)\W.*$/\1/'|sort -u
;;======================================================================
;; S U P P O R T F U N C T I O N S
;;======================================================================
;; if a server is either running or in the process of starting call client:setup
;; else return #f to let the calling proc know that there is no server available
;;
(define (rmt:get-connection-info run-id)
(let ((cinfo (hash-table-ref/default *runremote* run-id #f)))
(if cinfo
cinfo
(if (tasks:server-running-or-starting? (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
;; RA => e.g. usage (rmt:send-receive 'get-var #f (list varname))
;;
(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*)
(rmt:open-qry-close-locally cmd (if rid rid 0) params))
;; (let ((expire-time (- (current-seconds) (server:get-timeout) 10))) ;; don't forget the 10 second margin
;; (for-each
;; (lambda (run-id)
;; (let ((connection (hash-table-ref/default *runremote* run-id #f)))
;; (if (and (vector? connection)
;; (< (http-transport:server-dat-get-last-access connection) expire-time))
;; (begin
;; (debug:print-info 0 *default-log-port* "Discarding connection to server for run-id " run-id ", too long between accesses")
;; ;; bb- disabling nanomsg
;; ;; SHOULD CLOSE THE CONNECTION HERE
;; ;; (case *transport-type*
;; ;; ((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))
;; (home-host (common:get-homehost))
;; (connection-info (if (cdr home-host) ;; we are on the home-host
;; #f
;; (rmt:get-connection-info run-id))))
;; (cond
;; (home-host (rmt:open-qry-close-locally cmd run-id params))
;; (connection-info
;; ;; the nmsg method does the encoding under the hood (the http method should be changed to do this also)
;; ;; 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)(vector #f "communications fail"))
;; ((exn)(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))
;; (if success
;; (begin
;; ;; (mutex-unlock! *send-receive-mutex*)
;; (case *transport-type*
;; ((http) res) ;; (db:string->obj res))
;; ;; ((nmsg) res)
;; )) ;; (vector-ref res 1)))
;; (begin ;; let ((new-connection-info (client:setup run-id)))
;; (debug:print 0 *default-log-port* "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)
;; (rmt:send-receive cmd run-id params attemptnum: (+ attemptnum 1))))))
;; (else
;; ;; no connection info? try to start a server, or access locally if no
;; ;; server and the query is read-only
;; ;;
;; ;; Note: The tasks db was checked for a server in starting mode in the rmt:get-connection-info call
;; ;;
;; (if (and (< attemptnum 15)
;; (member cmd api:write-queries))
;; (let ((homehost (common:get-homehost))) ;; faststart (configf:lookup *configdat* "server" "faststart")))
;; (hash-table-delete! *runremote* run-id)
;; ;; (mutex-unlock! *send-receive-mutex*)
;; (if (not (cdr homehost)) ;; we always require a server if not on homehost ;; (and faststart (equal? faststart "no"))
;; (begin
;; (tasks:start-and-wait-for-server (db:delay-if-busy (tasks:open-db)) run-id 10)
;; (thread-sleep! (random 5)) ;; give some time to settle and minimize collison?
;; (rmt:send-receive cmd rid params attemptnum: (+ attemptnum 1)))
;; ;; NB - probably can remove the query time stuff but need to discuss it ....
;; (let ((start-time (current-milliseconds))
;; (max-query (string->number (or (configf:lookup *configdat* "server" "server-query-threshold")
;; "300")))
;; (newres (rmt:open-qry-close-locally cmd run-id params)))
;; (let ((delta (- (current-milliseconds) start-time)))
;; (if (> delta max-query)
;; (begin
;; (debug:print-info 0 *default-log-port* "WARNING: long query times, you may have an overloaded homehost.") ;; Starting server as query time " delta " is over the limit of " max-query)
;; ;; (server:kind-run run-id)))
;; ))
;; ;; return the result!
;; newres)
;; )))
;; (begin
;; ;; (debug:print-error 0 *default-log-port* "Communication failed!")
;; ;; (mutex-unlock! *send-receive-mutex*)
;; ;; (exit)
;; (rmt:open-qry-close-locally cmd run-id params)
;; ))))))
(define (rmt:update-db-stats run-id rawcmd params duration)
(mutex-lock! *db-stats-mutex*)
(handle-exceptions
exn
(begin
(debug:print 0 *default-log-port* "WARNING: stats collection failed in update-db-stats")
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(cons newmax-cmd currmax)
(cons 'none 0))
(loop (car tal)(cdr tal) newmax-cmd currmax)))))))
(mutex-unlock! *db-stats-mutex*)
res))
(define (rmt:open-qry-close-locally cmd run-id params #!key (remretries 5))
(let* ((dbstruct-local (db:open-local-db-handle))
(db-file-path (db:dbfile-path 0))
;; (read-only (not (file-read-access? db-file-path)))
(start (current-milliseconds))
(resdat (api:execute-requests dbstruct-local (vector (symbol->string cmd) params)))
(success (vector-ref resdat 0))
(res (vector-ref resdat 1))
(duration (- (current-milliseconds) start)))
(if (not success)
(if (> remretries 0)
(begin
(debug:print-error 0 *default-log-port* "local query failed. Trying again.")
(thread-sleep! (/ (random 5000) 1000)) ;; some random delay
(rmt:open-qry-close-locally cmd run-id params remretries: (- remretries 1)))
(begin
(debug:print-error 0 *default-log-port* "too many retries in rmt:open-qry-close-locally, giving up")
#f))
(begin
;; (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?
(mutex-unlock! *db-multi-sync-mutex*)))
res))))
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(cons newmax-cmd currmax)
(cons 'none 0))
(loop (car tal)(cdr tal) newmax-cmd currmax)))))))
(mutex-unlock! *db-stats-mutex*)
res))
(define (rmt:open-qry-close-locally cmd run-id params #!key (remretries 5))
(let* ((qry-is-write (not (member cmd api:read-only-queries)))
(db-file-path (db:dbfile-path)) ;; 0))
(dbstruct-local (if *dbstruct-db*
*dbstruct-db*
(let* ((db (db:setup))) ;; make-dbr:dbstruct path: dbdir local: #t)))
(set! *dbstruct-db* db)
db)))
(read-only (not (file-write-access? db-file-path)))
(start (current-milliseconds))
(resdat (if (not (and read-only qry-is-write))
(api:execute-requests dbstruct-local (vector (symbol->string cmd) params))
(vector #t '())))
(success (vector-ref resdat 0))
(res (vector-ref resdat 1))
(duration (- (current-milliseconds) start)))
(if (and read-only qry-is-write)
(debug:print 0 *default-log-port* "ERROR: attempt to write to read-only database ignored. cmd=" cmd))
(if (not success)
(if (> remretries 0)
(begin
(debug:print-error 0 *default-log-port* "local query failed. Trying again.")
(thread-sleep! (/ (random 5000) 1000)) ;; some random delay
(rmt:open-qry-close-locally cmd run-id params remretries: (- remretries 1)))
(begin
(debug:print-error 0 *default-log-port* "too many retries in rmt:open-qry-close-locally, giving up")
#f))
(begin
;; (rmt:update-db-stats run-id cmd params duration)
;; mark this run as dirty if this was a write
(if qry-is-write
(let ((start-time (current-seconds)))
(mutex-lock! *db-multi-sync-mutex*)
(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
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