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;;======================================================================
;; 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 areapath) ;; TODO: push areapath down.
(let ((cinfo (remote-conndat *runremote*))
(run-id 0))
(if cinfo
cinfo
(if (server:check-if-running areapath)
(client:setup areapath)
#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
;; do all the prep locked under the rmt-mutex
(mutex-lock! *rmt-mutex*)
;; 1. check if server is started IFF cmd is a write OR if we are not on the homehost, store in *runremote*
;; 2. check the age of the connections. refresh the connection if it is older than timeout-20 seconds.
;; 3. do the query, if on homehost use local access
;;
(let* ((start-time (current-seconds))) ;; snapshot time so all use cases get same value
(cond
;; give up if more than 15 attempts
((> attemptnum 15)
(debug:print 0 *default-log-port* "ERROR: 15 tries to start/connect to server. Giving up.")
(exit 1))
;; reset the connection if it has been unused too long
((and *runremote*
(remote-conndat *runremote*)
(let ((expire-time (+ (- start-time (remote-server-timeout *runremote*))(random 30)))) ;; add 30 seconds of noise so that not all running tests expire at the same time causing a storm of server starts
(< (http-transport:server-dat-get-last-access (remote-conndat *runremote*)) expire-time)))
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 8")
(remote-conndat-set! *runremote* #f)
(mutex-unlock! *rmt-mutex*)
(rmt:send-receive cmd rid params attemptnum: attemptnum))
;; ensure we have a record for our connection for given area
((not *runremote*)
(set! *runremote* (make-remote))
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 1")
(rmt:send-receive cmd rid params attemptnum: attemptnum))
;; ensure we have a homehost record
((not (pair? (remote-hh-dat *runremote*))) ;; not on homehost
(thread-sleep! 0.1) ;; since we shouldn't get here, delay a little
(remote-hh-dat-set! *runremote* (common:get-homehost))
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 2")
(rmt:send-receive cmd rid params attemptnum: attemptnum))
;; on homehost and this is a read
((and (cdr (remote-hh-dat *runremote*)) ;; on homehost
(member cmd api:read-only-queries)) ;; this is a read
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 3")
(rmt:open-qry-close-locally cmd 0 params))
;; on homehost and this is a write, we already have a server, but server has died
((and (cdr (remote-hh-dat *runremote*)) ;; on homehost
(not (member cmd api:read-only-queries)) ;; this is a write
(remote-server-url *runremote*) ;; have a server
(not (server:check-if-running *toppath*))) ;; server has died.
(set! *runremote* (make-remote))
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 4.1")
(rmt:send-receive cmd rid params attemptnum: attemptnum))
;; on homehost and this is a write, we already have a server
((and (cdr (remote-hh-dat *runremote*)) ;; on homehost
(not (member cmd api:read-only-queries)) ;; this is a write
(remote-server-url *runremote*)) ;; have a server
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 4")
(rmt:open-qry-close-locally cmd 0 params))
;; on homehost, no server contact made and this is a write, passively start a server
((and (cdr (remote-hh-dat *runremote*)) ; new
(not (remote-server-url *runremote*))
(not (member cmd api:read-only-queries)))
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 5")
(let ((server-url (server:check-if-running *toppath*))) ;; (server:read-dotserver->url *toppath*))) ;; (server:check-if-running *toppath*))) ;; Do NOT want to run server:check-if-running - very expensive to do for every write call
(if server-url
(remote-server-url-set! *runremote* server-url) ;; the string can be consumed by the client setup if needed
(server:kind-run *toppath*)))
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 5.1")
(rmt:open-qry-close-locally cmd 0 params))
((and (not (cdr (remote-hh-dat *runremote*))) ;; not on a homehost
(not (remote-conndat *runremote*))) ;; and no connection
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 6 hh-dat: " (remote-hh-dat *runremote*) " conndat: " (remote-conndat *runremote*))
(mutex-unlock! *rmt-mutex*)
(server:start-and-wait *toppath*)
(remote-conndat-set! *runremote* (rmt:get-connection-info *toppath*)) ;; calls client:setup which calls client:setup-http
(rmt:send-receive cmd rid params attemptnum: attemptnum)) ;; TODO: add back-off timeout as
;; all set up if get this far, dispatch the query
((cdr (remote-hh-dat *runremote*)) ;; we are on homehost
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 7")
(rmt:open-qry-close-locally cmd (if rid rid 0) params))
;; not on homehost, do server query
(else
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 9")
(mutex-lock! *rmt-mutex*)
(let* ((conninfo (remote-conndat *runremote*))
(dat (case (remote-transport *runremote*)
((http) (condition-case ;; handling here has caused a lot of problems. However it is needed to deal with attemtped communication to servers that have gone away
(http-transport:client-api-send-receive 0 conninfo cmd params)
((commfail)(vector #f "communications fail"))
((exn)(vector #f "other fail" (print-call-chain)))))
(else
(debug:print 0 *default-log-port* "ERROR: transport " (remote-transport *runremote*) " not supported")
(exit))))
(success (if (vector? dat) (vector-ref dat 0) #f))
(res (if (vector? dat) (vector-ref dat 1) #f)))
(if (vector? conninfo)(http-transport:server-dat-update-last-access conninfo)) ;; refresh access time
;; (mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 9. conninfo=" conninfo " dat=" dat " *runremote* = "*runremote*)
(if success
(case (remote-transport *runremote*)
((http)
(mutex-unlock! *rmt-mutex*)
res)
(else
(debug:print 0 *default-log-port* "ERROR: transport " (remote-transport *runremote*) " is unknown")
(mutex-unlock! *rmt-mutex*)
(exit 1)))
(begin
(debug:print 0 *default-log-port* "WARNING: communication failed. Trying again, try num: " attemptnum)
(remote-conndat-set! *runremote* #f)
(remote-server-url-set! *runremote* #f)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 9.1")
(mutex-unlock! *rmt-mutex*)
(server:start-and-wait *toppath*)
(rmt:send-receive cmd rid params attemptnum: (+ attemptnum 1)))))))))
;; (define (rmt:update-db-stats run-id rawcmd params duration)
;; (mutex-lock! *db-stats-mutex*)
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;;======================================================================
;; 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 areapath #!key (area-dat #f)) ;; TODO: push areapath down.
(let* ((runremote (or area-dat *runremote*))
(cinfo (remote-conndat runremote))
(run-id 0))
(if cinfo
cinfo
(if (server:check-if-running areapath)
(client:setup areapath)
#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)(area-dat #f)) ;; start attemptnum at 1 so the modulo below works as expected
;; do all the prep locked under the rmt-mutex
(mutex-lock! *rmt-mutex*)
;; 1. check if server is started IFF cmd is a write OR if we are not on the homehost, store in runremote
;; 2. check the age of the connections. refresh the connection if it is older than timeout-20 seconds.
;; 3. do the query, if on homehost use local access
;;
(let* ((start-time (current-seconds)) ;; snapshot time so all use cases get same value
(runremote (or area-dat *runremote*)))
(cond
;; give up if more than 15 attempts
((> attemptnum 15)
(debug:print 0 *default-log-port* "ERROR: 15 tries to start/connect to server. Giving up.")
(exit 1))
;; reset the connection if it has been unused too long
((and runremote
(remote-conndat runremote)
(let ((expire-time (+ (- start-time (remote-server-timeout runremote))(random 30)))) ;; add 30 seconds of noise so that not all running tests expire at the same time causing a storm of server starts
(< (http-transport:server-dat-get-last-access (remote-conndat runremote)) expire-time)))
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 8")
(remote-conndat-set! runremote #f)
(mutex-unlock! *rmt-mutex*)
(rmt:send-receive cmd rid params attemptnum: attemptnum))
;; ensure we have a record for our connection for given area
((not runremote)
(set! *runremote* (make-remote))
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 1")
(rmt:send-receive cmd rid params attemptnum: attemptnum))
;; ensure we have a homehost record
((not (pair? (remote-hh-dat runremote))) ;; not on homehost
(thread-sleep! 0.1) ;; since we shouldn't get here, delay a little
(remote-hh-dat-set! runremote (common:get-homehost))
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 2")
(rmt:send-receive cmd rid params attemptnum: attemptnum))
;; on homehost and this is a read
((and (cdr (remote-hh-dat runremote)) ;; on homehost
(member cmd api:read-only-queries)) ;; this is a read
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 3")
(rmt:open-qry-close-locally cmd 0 params))
;; on homehost and this is a write, we already have a server, but server has died
((and (cdr (remote-hh-dat runremote)) ;; on homehost
(not (member cmd api:read-only-queries)) ;; this is a write
(remote-server-url runremote) ;; have a server
(not (server:check-if-running *toppath*))) ;; server has died.
(set! *runremote* (make-remote))
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 4.1")
(rmt:send-receive cmd rid params attemptnum: attemptnum))
;; on homehost and this is a write, we already have a server
((and (cdr (remote-hh-dat runremote)) ;; on homehost
(not (member cmd api:read-only-queries)) ;; this is a write
(remote-server-url runremote)) ;; have a server
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 4")
(rmt:open-qry-close-locally cmd 0 params))
;; on homehost, no server contact made and this is a write, passively start a server
((and (cdr (remote-hh-dat runremote)) ; new
(not (remote-server-url runremote))
(not (member cmd api:read-only-queries)))
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 5")
(let ((server-url (server:check-if-running *toppath*))) ;; (server:read-dotserver->url *toppath*))) ;; (server:check-if-running *toppath*))) ;; Do NOT want to run server:check-if-running - very expensive to do for every write call
(if server-url
(remote-server-url-set! runremote server-url) ;; the string can be consumed by the client setup if needed
(server:kind-run *toppath*)))
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 5.1")
(rmt:open-qry-close-locally cmd 0 params))
((and (not (cdr (remote-hh-dat runremote))) ;; not on a homehost
(not (remote-conndat runremote))) ;; and no connection
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 6 hh-dat: " (remote-hh-dat runremote) " conndat: " (remote-conndat runremote))
(mutex-unlock! *rmt-mutex*)
(server:start-and-wait *toppath*)
(remote-conndat-set! runremote (rmt:get-connection-info *toppath*)) ;; calls client:setup which calls client:setup-http
(rmt:send-receive cmd rid params attemptnum: attemptnum)) ;; TODO: add back-off timeout as
;; all set up if get this far, dispatch the query
((cdr (remote-hh-dat runremote)) ;; we are on homehost
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 7")
(rmt:open-qry-close-locally cmd (if rid rid 0) params))
;; not on homehost, do server query
(else
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 9")
(mutex-lock! *rmt-mutex*)
(let* ((conninfo (remote-conndat runremote))
(dat (case (remote-transport runremote)
((http) (condition-case ;; handling here has caused a lot of problems. However it is needed to deal with attemtped communication to servers that have gone away
(http-transport:client-api-send-receive 0 conninfo cmd params)
((commfail)(vector #f "communications fail"))
((exn)(vector #f "other fail" (print-call-chain)))))
(else
(debug:print 0 *default-log-port* "ERROR: transport " (remote-transport runremote) " not supported")
(exit))))
(success (if (vector? dat) (vector-ref dat 0) #f))
(res (if (vector? dat) (vector-ref dat 1) #f)))
(if (vector? conninfo)(http-transport:server-dat-update-last-access conninfo)) ;; refresh access time
;; (mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 9. conninfo=" conninfo " dat=" dat " runremote = "runremote)
(if success
(case (remote-transport runremote)
((http)
(mutex-unlock! *rmt-mutex*)
res)
(else
(debug:print 0 *default-log-port* "ERROR: transport " (remote-transport runremote) " is unknown")
(mutex-unlock! *rmt-mutex*)
(exit 1)))
(begin
(debug:print 0 *default-log-port* "WARNING: communication failed. Trying again, try num: " attemptnum)
(remote-conndat-set! runremote #f)
(remote-server-url-set! runremote #f)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 9.1")
(mutex-unlock! *rmt-mutex*)
(server:start-and-wait *toppath*)
(rmt:send-receive cmd rid params attemptnum: (+ attemptnum 1)))))))))
;; (define (rmt:update-db-stats run-id rawcmd params duration)
;; (mutex-lock! *db-stats-mutex*)
|