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(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))
(connection-info (rmt:get-connection-info 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))
;; (home-host (common:get-homehost))
;; (connection-info (if (cdr home-host) ;; we are on the home-host
;; #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)(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 ((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)
)))))
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