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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 areapath #!key (area-dat #f)) ;; TODO: push areapath down.
(let* ((runremote (or area-dat *runremote*))
(cinfo (if (remote? runremote)
(remote-conndat runremote)
#f)))
(if cinfo
cinfo
(if (server:check-if-running areapath)
(client:setup areapath)
#f))))
(define *runremote* (make-remote))
;; this entry point can decide based on cmd whether to dispatch to old api calls via remote or via ulex
;;
(define (rmt:send-receive cmd rid params #!key (attemptnum 1)(area-dat #f))
(let* ((areapath *toppath*);; TODO - resolve from dbstruct to be compatible with multiple areas
(runremote (or area-dat
*runremote*)))
;; ensure we have a record for our connection for given area
(if (not runremote) ;; can remove this one. should never get here.
(if (not (remote-hh-dat runremote))
(begin
(set! *runremote* (make-remote))
(set! runremote *runremote*)
(remote-hh-dat-set! runremote (common:get-homehost ))
(remote-hh-dat-set! runremote (common:get-homehost))
)) ;; new runremote will come from this on next iteration
(if (member cmd '(blah))
(begin
(mutex-lock! *send-receive-mutex*)
(if (not *runremote*)(set! *runremote* (make-remote)))
(let ((ulex:conn (remote-ulex:conn *runremote*)))
(if (not ulex:conn)(remote-ulex:conn-set! *runremote* (rmtmod:setup-ulex areapath)))
(rmtmod:send-receive-ulex ulex:conn cmd rid params attemptnum area-dat)))
(rmt:send-receive-orig *default-log-port* runremote *rmt-mutex* areapath *db-multi-sync-mutex* cmd rid params attemptnum: attemptnum area-dat: area-dat ro-queries: api:read-only-queries))))
;; RA => e.g. usage (rmt:send-receive 'get-var #f (list varname))
;;
;; add multi-sync-mutex
;;
(define (rmt:send-receive-orig log-port runremote rmt-mutex toppath multi-sync-mutex cmd rid params #!key (attemptnum 1)(area-dat #f)) ;; start attemptnum at 1 so the modulo below works as expected
#;(common:telemetry-log (conc "rmt:"(->string cmd))
payload: `((rid . ,rid)
(params . ,params)))
;; 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
(readonly-mode (rmtmod:calc-ro-mode runremote toppath)))
(if (not (pair? (remote-hh-dat runremote))) ;; not on homehost
;;(print "BB> readonly-mode is "readonly-mode" dbfile is "dbfile)
(cond
;; give up if more than 15 attempts
((> attemptnum 15)
(debug:print 0 log-port "ERROR: 15 tries to start/connect to server. Giving up.")
(exit 1))
;; readonly mode, read request- handle it - case 2
((and readonly-mode
(member cmd api:read-only-queries))
;; (mutex-unlock! rmt-mutex)
(debug:print-info 12 log-port "rmt:send-receive, case 2")
(rmt:open-qry-close-locally log-port multi-sync-mutex cmd 0 params ro-queries: api:read-only-queries)
)
;; readonly mode, write request. Do nothing, return #f
(readonly-mode (extras-readonly-mode rmt-mutex log-port cmd params))
;; This block was for pre-emptively resetting the connection if there had been no communication for some time.
;; I don't think it adds any value. If the server is not there, just fail and start a new connection.
;; also, the expire-time calculation might not be correct. We want, time-since-last-server-access > (server:get-timeout)
;;
;; reset the connection if it has been unused too long
((and runremote
(remote-conndat runremote)
(> (current-seconds) ;; if it has been more than server-timeout seconds since last contact, close this connection and start a new on
(+ (http-transport:server-dat-get-last-access (remote-conndat runremote))
(remote-server-timeout runremote))))
(debug:print-info 0 log-port "Connection to " (remote-server-url runremote) " expired due to no accesses, forcing new connection.")
(http-transport:close-connections area-dat: runremote)
(remote-conndat-set! runremote #f) ;; invalidate the connection, thus forcing a new connection.
;; (mutex-unlock! rmt-mutex)
(rmt:send-receive-orig log-port runremote rmt-mutex toppath multi-sync-mutex cmd rid params attemptnum: attemptnum))
;; on homehost and this is a read
((and (not (remote-force-server runremote)) ;; honor forced use of server, i.e. server NOT required
(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 log-port "rmt:send-receive, case 5")
(rmt:open-qry-close-locally log-port multi-sync-mutex cmd 0 params ro-queries: api:read-only-queries))
;; 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:ping (remote-server-url runremote)))) ;; server has died. NOTE: this is not a cheap call! Need better approach.
(set! *runremote* (make-remote))
(remote-force-server-set! runremote (common:force-server?))
;; (mutex-unlock! rmt-mutex)
(debug:print-info 12 log-port "rmt:send-receive, case 6")
(rmt:send-receive-orig log-port runremote rmt-mutex toppath multi-sync-mutex cmd rid params attemptnum: attemptnum))
;; on homehost and this is a write, we already have a server
((and (not (remote-force-server runremote)) ;; honor forced use of server, i.e. server NOT required
(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 log-port "rmt:send-receive, case 4.1")
(rmt:open-qry-close-locally log-port multi-sync-mutex cmd 0 params ro-queries: api:read-only-queries))
;; on homehost, no server contact made and this is a write, passively start a server
((and (not (remote-force-server runremote)) ;; honor forced use of server, i.e. server NOT required
(cdr (remote-hh-dat runremote)) ;; have homehost
(not (remote-server-url runremote)) ;; no connection yet
(not (member cmd api:read-only-queries))) ;; not a read-only query
(debug:print-info 12 log-port "rmt:send-receive, case 8")
(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
(if (common:force-server?)
(server:start-and-wait toppath)
(server:kind-run toppath))))
(remote-force-server-set! runremote (common:force-server?))
;; (mutex-unlock! rmt-mutex)
(debug:print-info 12 log-port "rmt:send-receive, case 8.1")
(rmt:open-qry-close-locally log-port multi-sync-mutex cmd 0 params ro-queries: api:read-only-queries))
((or (and (remote-force-server runremote) ;; we are forcing a server and don't yet have a connection to one
(not (remote-conndat runremote)))
(and (not (cdr (remote-hh-dat runremote))) ;; not on a homehost
(not (remote-conndat runremote)))) ;; and no connection
(debug:print-info 12 log-port "rmt:send-receive, case 9, hh-dat: " (remote-hh-dat runremote) " conndat: " (remote-conndat runremote))
;;(mutex-unlock! rmt-mutex)
(if (not (server:check-if-running toppath)) ;; who knows, maybe one has started up?
(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-orig log-port runremote rmt-mutex toppath multi-sync-mutex cmd rid params attemptnum: attemptnum)) ;; TODO: add back-off timeout as
;; all set up if get this far, dispatch the query
((and (not (remote-force-server runremote))
(cdr (remote-hh-dat runremote))) ;; we are on homehost
;;(mutex-unlock! rmt-mutex)
(debug:print-info 12 log-port "rmt:send-receive, case 10")
(rmt:open-qry-close-locally log-port multi-sync-mutex cmd (if rid rid 0) params ro-queries: api:read-only-queries))
;; not on homehost, do server query
(else (extras-case-11 log-port runremote cmd params attemptnum rid)))))
(define (extras-case-11 *default-log-port* runremote cmd params attemptnum rid)
;; (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 (and (vector? conninfo) (< 5 (vector-length conninfo)))
(http-transport:server-dat-update-last-access conninfo) ;; refresh access time
(begin
(debug:print 0 *default-log-port* "INFO: Should not get here! conninfo=" conninfo)
(set! conninfo #f)
(remote-conndat-set! *runremote* #f) ;; NOTE: *runremote* is global copy of runremote. Purpose: factor out global.
(http-transport:close-connections area-dat: runremote)))
(debug:print-info 13 *default-log-port* "rmt:send-receive, case 9. conninfo=" conninfo " dat=" dat " runremote = " runremote)
(mutex-unlock! *rmt-mutex*)
(if success ;; success only tells us that the transport was
;; successful, have to examine the data to see if
;; there was a detected issue at the other end
(extras-transport-succeded *default-log-port* *rmt-mutex* attemptnum runremote res params rid cmd)
(extras-transport-failed *default-log-port* *rmt-mutex* attemptnum runremote cmd rid params)
)))
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(define (rmt:test-set-archive-block-id run-id test-id archive-block-id)
(rmt:send-receive 'test-set-archive-block-id run-id (list run-id test-id archive-block-id)))
(define (rmt:test-get-archive-block-info archive-block-id)
(rmt:send-receive 'test-get-archive-block-info #f (list archive-block-id)))
(set-functions rmt:send-receive remote-server-url-set!
http-transport:close-connections remote-conndat-set!
debug:print debug:print-info
(set-functions http-transport:client-api-send-receive ;; a
http-transport:close-connections ;; b
api:execute-requests ;; c
api:read-only-queries ;; d
client:setup ;; e
debug:print-error
remote-ro-mode remote-ro-mode-set!
remote-ro-mode-checked-set! remote-ro-mode-checked
#f #f
api:execute-requests api:read-only-queries)
|