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;;======================================================================
;; Copyright 2006-2013, 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 nmsg-transport))
;;
;; THESE ARE ALL CALLED ON THE CLIENT SIDE!!!
;;
;; ;; For debugging add the following to ~/.megatestrc
;;
;; (require-library trace)
;; (import trace)
;; (trace
;; rmt:send-receive
;; api:execute-requests
;; )
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;;======================================================================
;; Copyright 2006-2013, 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 format typed-records) ;; RADT => purpose of json format??
(declare (unit rmt))
(declare (uses api))
(declare (uses tdb))
(declare (uses http-transport))
;;(declare (uses nmsg-transport))
(include "common_records.scm")
;;
;; THESE ARE ALL CALLED ON THE CLIENT SIDE!!!
;;
;; 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
;;======================================================================
;; thread-safe interface to *runremote* hash
(define *rrr-mutex* (make-mutex))
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;; 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 *runremote*)) ;; (hash-table-ref/default *runremote* run-id #f)))
(if cinfo
cinfo
(if (tasks:server-running-or-starting? (db:delay-if-busy (tasks:open-db)) run-id)
(client:setup run-id)
#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
;; clean out old connections
;; (mutex-lock! *db-multi-sync-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
;;
(if (and ;; #f ;; FORCE NO GO FOR RIGHT NOW
(not *runremote*) ;; we trust *runremote* to reflect that a server was found previously
(not (member cmd api:read-only-queries))) ;; we don't trust so much the list of write queries
(let ((serverconn (server:check-if-running *toppath*)))
(if serverconn
(set! *runremote* serverconn) ;; the string can be consumed by the client setup if needed
(if (not (server:start-attempted? *toppath*))
(server:kind-run *toppath*)))))
(rmt:open-qry-close-locally cmd (if rid rid 0) params))
;; (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)))))
;; (hash-table-delete! *runremote* run-id)))))
;; (hash-table-keys *runremote*)))
;; ;; (mutex-unlock! *db-multi-sync-mutex*)
;; ;; (mutex-lock! *send-receive-mutex*)
;; (let* ((run-id (if rid rid 0))
;; (home-host (common:get-homehost))
;; (connection-info (if (cdr home-host) ;; we are on the home-host
;; #f
;; (rmt:get-connection-info run-id))))
;; (cond
;; (home-host (rmt:open-qry-close-locally cmd run-id params))
;; (connection-info
;; ;; the nmsg method does the encoding under the hood (the http method should be changed to do this also)
;; ;; 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))))
;; (success (if (vector? dat) (vector-ref dat 0) #f))
;; (res (if (vector? dat) (vector-ref dat 1) #f)))
;; (if (vector? connection-info)(http-transport:server-dat-update-last-access connection-info))
;; (if success
;; (begin
;; ;; (mutex-unlock! *send-receive-mutex*)
;; (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))))))
;; (else
;; ;; no connection info? try to start a server, or access locally if no
;; ;; server and the query is read-only
;; ;;
;; ;; Note: The tasks db was checked for a server in starting mode in the rmt:get-connection-info call
;; ;;
;; (if (and (< attemptnum 15)
;; (member cmd api:write-queries))
;; (let ((homehost (common:get-homehost))) ;; faststart (configf:lookup *configdat* "server" "faststart")))
;; (hash-table-delete! *runremote* run-id)
;; ;; (mutex-unlock! *send-receive-mutex*)
;; (if (not (cdr homehost)) ;; we always require a server if not on homehost ;; (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)))
;; ;; NB - probably can remove the query time stuff but need to discuss it ....
;; (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* "WARNING: long query times, you may have an overloaded homehost.") ;; 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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;; 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 (remote-conndat *runremote*)))
(if cinfo
cinfo
(if (tasks:server-running-or-starting? (db:delay-if-busy (tasks:open-db)) run-id)
(client:setup run-id)
#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))
;; 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))
;; not on homehost, do server query
(else
(mutex-unlock! *rmt-mutex*)
(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)))))
(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) 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
exn
(begin
(debug:print 0 *default-log-port* "WARNING: stats collection failed in update-db-stats")
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(mutex-lock! *db-multi-sync-mutex*)
(set! *db-last-write* start-time) ;; the oldest "write"
(mutex-unlock! *db-multi-sync-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))
;; ((commfail) (vector #f "communications fail")))))
;; (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))))
;; Wrap json library for strings (why the ports crap in the first place?)
(define (rmt:dat->json-str dat)
(with-output-to-string
(lambda ()
(json-write dat))))
(define (rmt:json-str->dat json-str)
(with-input-from-string json-str
(lambda ()
(json-read))))
;;======================================================================
;;
;; A C T U A L A P I C A L L S
;;
;;======================================================================
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(mutex-lock! *db-multi-sync-mutex*)
(set! *db-last-write* start-time) ;; the oldest "write"
(mutex-unlock! *db-multi-sync-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))
(res (handle-exceptions
exn
#f
(http-transport:client-api-send-receive run-id connection-info cmd params))))
(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
;; (lambda ()
;; (json-write dat))))
;;
;; (define (rmt:json-str->dat json-str)
;; (with-input-from-string json-str
;; (lambda ()
;; (json-read))))
;;======================================================================
;;
;; A C T U A L A P I C A L L S
;;
;;======================================================================
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(rmt:send-receive 'start-server 0 (list run-id)))
;;======================================================================
;; M I S C
;;======================================================================
(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)
(case *transport-type* ;; run-id of 0 is just a placeholder
((http)(rmt:send-receive-no-auto-client-setup connection-info 'login 0 (list *toppath* megatest-version *my-client-signature*)))
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(rmt:send-receive 'start-server 0 (list run-id)))
;;======================================================================
;; M I S C
;;======================================================================
(define (rmt:login run-id)
(rmt:send-receive 'login run-id (list *toppath* megatest-version *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)
(case *transport-type* ;; run-id of 0 is just a placeholder
((http)(rmt:send-receive-no-auto-client-setup connection-info 'login 0 (list *toppath* megatest-version *my-client-signature*)))
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