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;;======================================================================
;; Copyright 2006-2013, Matthew Welland.
;;(declare (uses nmsg-transport))
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;; Copyright 2006-2016, Matthew Welland.
;;
;; This program is made available under the GNU GPL version 2.0 or
;; greater. See the accompanying file COPYING for details.
;;
;; This program is distributed WITHOUT ANY WARRANTY; without even the
;; implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
;; PURPOSE.
;;======================================================================
(use json format) ;; RADT => purpose of json format??
(declare (unit rmt))
(declare (uses api))
(declare (uses tdb))
(declare (uses http-transport))
(declare (uses rpc-transport))
;;
;; THESE ARE ALL CALLED ON THE CLIENT SIDE!!!
;;
;; ;; For debugging add the following to ~/.megatestrc
;;
;; (require-library trace)
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(debug:print-info 1 *default-log-port* "db write rate too high, starting a server, count=" count " start=" start " run-id=" run-id " queries-per-second=" queries-per-second)
#t)
#f))))
;; 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 run-id)
(let ((cinfo (hash-table-ref/default *runremote* run-id #f)))
(if cinfo
cinfo
;; clean out old connections
;; (mutex-lock! *db-multi-sync-mutex*)
(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)))))
;; (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)))
;; 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))))
(if (vector? connection-info)(http-transport:server-dat-update-last-access connection-info))
(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
(if (and (< attemptnum 15)
(member cmd api:write-queries))
(let ((faststart (configf:lookup *configdat* "server" "faststart")))
(hash-table-delete! *runremote* run-id)
;; (mutex-unlock! *send-receive-mutex*)
(if (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)))
(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* "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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(debug:print-info 1 *default-log-port* "db write rate too high, starting a server, count=" count " start=" start " run-id=" run-id " queries-per-second=" queries-per-second)
#t)
#f))))
;; 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 *rrr-mutex* (make-mutex))
(define (rmt:get-cinfo rid)
(mutex-lock! *rrr-mutex*)
(let* ((run-id (if rid rid 0))
(cinfo (hash-table-ref/default *runremote* run-id #f)))
(mutex-unlock! *rrr-mutex*)
cinfo))
(define (rmt:set-cinfo rid server-dat)
(mutex-lock! *rrr-mutex*)
(let* ((run-id (if rid rid 0))
(res (hash-table-set! *runremote* run-id server-dat)))
(mutex-unlock! *rrr-mutex*)
res))
(define (rmt:del-cinfo rid)
(mutex-lock! *rrr-mutex*)
(let* ((run-id (if rid rid 0))
(res (hash-table-delete! *runremote* run-id)))
(mutex-unlock! *rrr-mutex*)
res))
(define (rmt:get-connection-info-start-server-if-none run-id)
(let ((cinfo (rmt:get-cinfo run-id)))
(if cinfo
cinfo
;; NB// can cache the answer for server running for 10 seconds ...
;; ;; (and (not (rmt:write-frequency-over-limit? cmd run-id))
(if (tasks:server-running-or-starting? (db:delay-if-busy (tasks:open-db)) run-id)
(client:setup run-id)
#f))))
(define (rmt:run-id->transport-type run-id)
(let* ((connection-info (rmt:get-cinfo run-id)))
;; the nmsg method does the encoding under the hood (the http method should be changed to do this also)
(if connection-info ;; if we already have a connection for this run-id, use that precendent
;; use the server if have connection info
(let* ((transport-type (vector-ref connection-info 6))) ;; BB: assumes all transport-type'-servertdat vector's item 6 ids transport type
transport-type)
;; otherwise pick the global default as preference. (set in common.scm)
*transport-type*)))
(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:srmutex* (make-mutex))
(define (rmt:send-receive cmd rid params #!key (attemptnum 1)) ;; start attemptnum at 1 so the modulo below works as expected
;; side-effect: clean out old connections
(when (eq? (modulo attemptnum 5) 0)
(debug:print-error 0 *default-log-port* "rmt:send-receive did not succeed after "(sub1 attemptnum)" tries. Aborting. (cmd="cmd" rid="rid" param="params)
(exit 1))
(mutex-lock! *rmt:srmutex*) ;; deadlock is here!
;; expire connections
(let ((expire-time (- (current-seconds) (server:get-timeout) 60))) ;; don't forget the 60 second margin
(for-each
(lambda (run-id)
(let ((connection (rmt:get-cinfo run-id)))
(if (and (vector? connection)
(< (http-transport:server-dat-get-last-access connection) expire-time)) ;; BB> BBTODO: make this generic, not http transport specific.
(begin
(debug:print-info 0 *default-log-port* "Discarding connection to server for run-id " run-id ", too long between accesses")
(hash-table-delete! *runremote* run-id)))))
(hash-table-keys *runremote*)))
(let* ((run-id (if rid rid 0))
(connection-info (rmt:get-connection-info-start-server-if-none run-id)))
;; the nmsg method does the encoding under the hood (the http method should be changed to do this also)
;;(BB> "in rmt:send-receive; run-id="run-id";;connection-info="connection-info)
(if connection-info
;; use the server if have connection info
(let* ((transport-type (rmt:run-id->transport-type run-id))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Here, we make request to remote server
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(dat (begin
(case transport-type ;; BB: replaced *transport-type* global with run-id specific 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"))))
((rpc) (rpc-transport:client-api-send-receive run-id connection-info cmd params)) ;; BB: let us error out for now
(else
(debug:print-error 0 *default-log-port* "(1) Transport [" transport-type
"] specified for run-id [" run-id
"] is not implemented in rmt:send-receive. Cannot proceed." (symbol? transport-type))
(vector #f (conc "transport ["transport-type"] unimplemented"))))))
(success (if (vector? dat) (vector-ref dat 0) #f))
(res (if (vector? dat) (vector-ref dat 1) #f)))
;;(BB> "in rmt:send-receive; transport-type="transport-type" success="success" connection-info="connection-info" res="res " dat="dat)
(if (and success (vector? connection-info))
(http-transport:server-dat-update-last-access connection-info)) ;; BB> BBTODO: make this generic, not http transport specific.
(if success
(begin
(mutex-unlock! *rmt:srmutex*)
;; (mutex-unlock! *send-receive-mutex*)
(case transport-type
((http rpc) res) ;; (db:string->obj res))
(else
(debug:print-error 0 *default-log-port* "(2) Transport [" transport-type
"] specified for run-id [" run-id
"] is not implemented in rmt:send-receive. Cannot proceed. Also unexpected since this branch follows success which would follow a suported transport...")
#f)
)) ;; (vector-ref res 1)))
;; no success...
(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.")
(mutex-unlock! *rmt:srmutex*)
(rmt:del-cinfo run-id) ;; don't keep using the same connection
(rmt:send-receive cmd rid params attemptnum: attemptnum)
;; (case transport-type
;; ((http rpc)
;; ;; 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)
;; (thread-sleep! 5)
;; ;; (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)))
;; (else
;; (debug:print-error 0 *default-log-port* "(3) Transport [" transport-type
;; "] specified for run-id [" run-id
;; "] is not implemented in rmt:send-receive. Cannot proceed.")
;; (exit 1)))
)))
;; no connection info; try to start a server
;;
;; Note: The tasks db was checked for a server in starting mode in the rmt:get-connection-info call
;;
(begin
(mutex-unlock! *rmt:srmutex*)
(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))))))
(define (rmt:update-db-stats run-id rawcmd params duration)
(mutex-lock! *db-stats-mutex*)
(handle-exceptions
exn
(begin
(debug:print 0 *default-log-port* "WARNING: stats collection failed in update-db-stats")
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(if (> tot 10)
(cons newmax-cmd currmax)
(cons 'none 0))
(loop (car tal)(cdr tal) newmax-cmd currmax)))))))
(mutex-unlock! *db-stats-mutex*)
res))
(define (rmt:open-qry-close-locally cmd run-id params #!key (remretries 5))
(let* ((dbstruct-local (db:open-local-db-handle))
(db-file-path (db:dbfile-path 0))
;; (read-only (not (file-read-access? db-file-path)))
(start (current-milliseconds))
(resdat (api:execute-requests dbstruct-local (vector (symbol->string cmd) params)))
(success (vector-ref resdat 0))
(res (vector-ref resdat 1))
(duration (- (current-milliseconds) start)))
(if (not success)
(if (> remretries 0)
(begin
(debug:print-error 0 *default-log-port* "local query failed. Trying again.")
(thread-sleep! (/ (random 5000) 1000)) ;; some random delay
(rmt:open-qry-close-locally cmd run-id params remretries: (- remretries 1)))
(begin
(debug:print-error 0 *default-log-port* "too many retries in rmt:open-qry-close-locally, giving up")
#f))
(begin
;; (rmt:update-db-stats run-id cmd params duration)
;; mark this run as dirty if this was a write
(if (not (member cmd api:read-only-queries))
(let ((start-time (current-seconds)))
(mutex-lock! *db-multi-sync-mutex*)
;; (if (not (hash-table-ref/default *db-local-sync* run-id #f))
;; just set it every time. Is a write more expensive than a read and does it matter?
(hash-table-set! *db-local-sync* (or run-id 0) start-time) ;; the oldest "write"
(mutex-unlock! *db-multi-sync-mutex*)))
res))))
(res (handle-exceptions
exn
#f
(http-transport:client-api-send-receive run-id connection-info cmd params))))
;; ((commfail) (vector #f "communications fail")))))
(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)))
;; (db:string->obj (vector-ref dat 1))
;; (begin
;; (debug:print-error 0 *default-log-port* "rmt:send-receive-no-auto-client-setup failed, attempting to continue. Got " dat)
;; dat))))
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(if (> tot 10)
(cons newmax-cmd currmax)
(cons 'none 0))
(loop (car tal)(cdr tal) newmax-cmd currmax)))))))
(mutex-unlock! *db-stats-mutex*)
res))
(define (rmt:send-receive-no-auto-client-setup connection-info cmd run-id params)
(let* ((run-id (if run-id run-id 0))
;; (jparams (db:obj->string params)) ;; (rmt:dat->json-str params))
(res (case (rmt:run-id->transport-type run-id)
((http)
(handle-exceptions
exn
#f
(http-transport:client-api-send-receive run-id connection-info cmd params)))
((rpc)
(handle-exceptions
exn
#f
(rpc-transport:client-api-send-receive run-id connection-info cmd params)))
(else
(debug:print-error 0 *default-log-port* "(4) Transport [" *transport-type*
"] specified for run-id [" run-id
"] is not implemented in rmt:send-receive-no-auto-client-setup. Cannot proceed.")
(exit 1)))))
;; ((commfail) (vector #f "communications fail")))))
(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)))
;; (db:string->obj (vector-ref dat 1))
;; (begin
;; (debug:print-error 0 *default-log-port* "rmt:send-receive-no-auto-client-setup failed, attempting to continue. Got " dat)
;; dat))))
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(define (rmt:login run-id)
(rmt:send-receive 'login run-id (list *toppath* megatest-version run-id *my-client-signature*)))
;; This login does no retries under the hood - it acts a bit like a ping.
;; Deprecated for nmsg-transport.
;;
(define (rmt:login-no-auto-client-setup connection-info run-id)
(case *transport-type*
((http)(rmt:send-receive-no-auto-client-setup connection-info 'login run-id (list *toppath* megatest-version run-id *my-client-signature*)))
;;((nmsg)(nmsg-transport:client-api-send-receive run-id connection-info 'login (list *toppath* megatest-version run-id *my-client-signature*)))
))
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(define (rmt:login run-id)
(rmt:send-receive 'login run-id (list *toppath* megatest-version run-id *my-client-signature*)))
;; This login does no retries under the hood - it acts a bit like a ping.
;; Deprecated for nmsg-transport.
;;
(define (rmt:login-no-auto-client-setup connection-info run-id)
(rmt:send-receive-no-auto-client-setup connection-info 'login run-id (list *toppath* megatest-version run-id *my-client-signature*)))
;; hand off a call to one of the db:queries statements
;; added run-id to make looking up the correct db possible
;;
(define (rmt:general-call stmtname run-id . params)
(rmt:send-receive 'general-call run-id (append (list stmtname run-id) params)))
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