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(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 *toppath*)))
(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))))
(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)
;;(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
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((> 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)
;; (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)
(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)
;; (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)
;; (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))
(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)
;; (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)
;;(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))
(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)
;; (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))
(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)
;;(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)
;;(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))
(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)))))
;; bunch of small functions factored out of send-receive to make debug easier
;;
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