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;; generate entries for ~/.megatestrc with the following
;;
;; grep define ../rmt.scm | grep rmt: |perl -pi -e 's/\(define\s+\((\S+)\W.*$/\1/'|sort -u
(defstruct remote
(hh-dat (common:get-homehost)) ;; homehost record ( addr . hhflag )
(server-url (if *toppath* (server:check-if-running *toppath*) #f))
(last-server-check 0) ;; last time we checked to see if the server was alive
(conndat #f)
(transport *transport-type*)
(server-timeout (or (server:get-timeout) 100))) ;; default to 100 seconds
;;======================================================================
;; S U P P O R T F U N C T I O N S
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;; generate entries for ~/.megatestrc with the following
;;
;; grep define ../rmt.scm | grep rmt: |perl -pi -e 's/\(define\s+\((\S+)\W.*$/\1/'|sort -u
(defstruct remote
(hh-dat (common:get-homehost)) ;; homehost record ( addr . hhflag )
(server-url (if *toppath* (server:read-dotserver *toppath*))) ;; (server:check-if-running *toppath*) #f))
(last-server-check 0) ;; last time we checked to see if the server was alive
(conndat #f)
(transport *transport-type*)
(server-timeout (or (server:get-timeout) 100))) ;; default to 100 seconds
;;======================================================================
;; S U P P O R T F U N C T I O N S
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;;
(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))
;; ensure we have a record for our connection for given area
((not *runremote*)
(set! *runremote* (make-remote))
(mutex-unlock! *rmt-mutex*)
(print "case 1")
(rmt:send-receive cmd rid params attemptnum: attemptnum))
;; ensure we have a homehost record
((not (pair? (remote-hh-dat *runremote*))) ;; have a homehost record?
(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*)
(print "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*)
(print "case 3")
(rmt:open-qry-close-locally cmd 0 params))
;; 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*)
(print "case 4")
(rmt:open-qry-close-locally cmd 0 params))
;; no server contact made and this is a write, passively start a server
((and (not (remote-server-url *runremote*))
(not (member cmd api:read-only-queries)))
(print "case 5")
(let ((serverconn (server:check-if-running *toppath*)))
(if serverconn
(remote-server-url-set! *runremote* serverconn) ;; the string can be consumed by the client setup if needed
(if (not (server:start-attempted? *toppath*))
(server:kind-run *toppath*))))
(if (cdr (remote-hh-dat *runremote*)) ;; we are on the homehost, just do the call
(begin
(mutex-unlock! *rmt-mutex*)
(print "case 5.1")
(rmt:open-qry-close-locally cmd 0 params))
(begin
(mutex-unlock! *rmt-mutex*)
(print "case 5.2")
(tasks:start-and-wait-for-server (tasks:open-db) 0 15)
(rmt:send-receive cmd rid params attemptnum: attemptnum))))
;; if not on homehost ensure we have a connection to a live server
;; NOTE: we *have* a homehost record by now
((and (not (cdr (remote-hh-dat *runremote*))) ;; are we on a homehost?
(not (remote-conndat *runremote*))) ;; and no connection
(print "case 6 hh-dat: " (remote-hh-dat *runremote*) " conndat: " (remote-conndat *runremote*))
(mutex-unlock! *rmt-mutex*)
(tasks:start-and-wait-for-server (tasks:open-db) 0 15)
(remote-conndat-set! *runremote* (rmt:get-connection-info 0))
(rmt:send-receive cmd rid params attemptnum: attemptnum))
;; all set up if get this far, dispatch the query
((cdr (remote-hh-dat *runremote*)) ;; we are on homehost
(mutex-unlock! *rmt-mutex*)
(print "case 7")
(rmt:open-qry-close-locally cmd (if rid rid 0) params))
;; reset the connection if it has been unused too long
((and (remote-conndat *runremote*)
(let ((expire-time (- start-time (remote-server-timeout *runremote*))))
(< (http-transport:server-dat-get-last-access (remote-conndat *runremote*)) expire-time)))
(print "case 8")
(remote-conndat-set! *runremote* #f))
(print "case 9")
(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)))))
((rpc) (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
(rpc-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
(print "case 9. conninfo=" conninfo " dat=" dat)
(if success
(case (remote-transport *runremote*)
((http rpc) res)
(else
(debug:print 0 *default-log-port* "ERROR: transport " (remote-transport *runremote*) " is unknown")
(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)
(print "case 9.1")
(tasks:start-and-wait-for-server (tasks:open-db) 0 15)
(rmt:send-receive cmd rid params attemptnum: (+ attemptnum 1)))))))))
(define (rmt:update-db-stats run-id rawcmd params duration)
(mutex-lock! *db-stats-mutex*)
(handle-exceptions
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;;
(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*))))
(< (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*))) ;; have a homehost record?
(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
((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 and this is a write, we have a server (we know because case 4 checked)
((and (cdr (remote-hh-dat *runremote*)) ;; on homehost
(not (member cmd api:read-only-queries)))
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 4.1")
(rmt:open-qry-close-locally cmd 0 params))
;; no server contact made and this is a write, passively start a server
((and (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 ((serverconn (server:read-dotserver *toppath*))) ;; (server:check-if-running *toppath*))) ;; Do NOT want to run server:check-if-running - very expensive to do for every write call
(if serverconn
(remote-server-url-set! *runremote* serverconn) ;; the string can be consumed by the client setup if needed
(if (not (server:start-attempted? *toppath*))
(server:kind-run *toppath*))))
(if (cdr (remote-hh-dat *runremote*)) ;; we are on the homehost, just do the call
(begin
(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))
(begin ;; not on homehost, start server and wait
(mutex-unlock! *rmt-mutex*)
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 5.2")
(tasks:start-and-wait-for-server (tasks:open-db) 0 15)
(rmt:send-receive cmd rid params attemptnum: attemptnum))))
;; if not on homehost ensure we have a connection to a live server
;; NOTE: we *have* a homehost record by now
((and (not (cdr (remote-hh-dat *runremote*))) ;; are we 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*)
(tasks:start-and-wait-for-server (tasks:open-db) 0 15)
(remote-conndat-set! *runremote* (rmt:get-connection-info 0)) ;; calls client:setup which calls client:setup-http
(rmt:send-receive cmd rid params attemptnum: attemptnum))
;; 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")
(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)))))
((rpc) (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
(rpc-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
(debug:print-info 12 *default-log-port* "rmt:send-receive, case 9. conninfo=" conninfo " dat=" dat)
(if success
(case (remote-transport *runremote*)
((http rpc) res)
(else
(debug:print 0 *default-log-port* "ERROR: transport " (remote-transport *runremote*) " is unknown")
(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")
(tasks:start-and-wait-for-server (tasks:open-db) 0 15)
(rmt:send-receive cmd rid params attemptnum: (+ attemptnum 1)))))))))
(define (rmt:update-db-stats run-id rawcmd params duration)
(mutex-lock! *db-stats-mutex*)
(handle-exceptions
exn
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(case (remote-transport *runremote*)
((http) (http-transport:client-api-send-receive run-id connection-info cmd params))
((rpc) (rpc-transport:client-api-send-receive run-id connection-info cmd params))
(else
(debug:print 0 *default-log-port* "ERROR: transport " (remote-transport *runremote*) " not supported (2)")
(exit))
)))
(if (and res (vector-ref res 0))
(vector-ref res 1) ;;; YES!! THIS IS CORRECT!! CHANGE IT HERE, THEN CHANGE rmt:send-receive ALSO!!!
#f)))
;; ;; 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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(case (remote-transport *runremote*)
((http) (http-transport:client-api-send-receive run-id connection-info cmd params))
((rpc) (rpc-transport:client-api-send-receive run-id connection-info cmd params))
(else
(debug:print 0 *default-log-port* "ERROR: transport " (remote-transport *runremote*) " not supported (2)")
(exit))
))))
(if (and res (vector-ref res 0))
(vector-ref res 1) ;;; YES!! THIS IS CORRECT!! CHANGE IT HERE, THEN CHANGE rmt:send-receive ALSO!!!
#f)))
;; ;; 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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