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|
(declare (uses common))
(declare (uses db))
(declare (uses tests))
(declare (uses tasks)) ;; tasks are where stuff is maintained about what is running.
(include "common_records.scm")
(include "db_records.scm")
(define *heartbeat-mutex* (make-mutex))
(define *server-loop-heart-beat* (current-seconds))
;; procstr is the name of the procedure to be called as a string
(define (rpc-transport:autoremote procstr params)
(handle-exceptions
exn
(begin
(debug:print 1 *default-log-port* "Remote failed for " proc " " params)
(apply (eval (string->symbol procstr)) params))
;; (if *runremote*
;; (apply (eval (string->symbol (conc "remote:" procstr))) params)
(apply (eval (string->symbol procstr)) params)))
(define (rpc-transport:autoremote procstr params) ;; may be unused, I think api-exec deprecates this one.
(let* ((procsym (if (symbol? procstr)
procstr
(string->symbol (->string procstr))))
(res
(begin
(apply (eval procsym) params))))
res))
;; rpc receiver
(define (rpc-transport:api-exec cmd params)
(let* ( (resdat (api:execute-requests *inmemdb* (vector cmd params))) ;; #( flag result )
(flag (vector-ref resdat 0))
(res (vector-ref resdat 1)))
(mutex-lock! *heartbeat-mutex*)
(set! *last-db-access* (current-seconds)) ;; bump *last-db-access*; this will renew keep-running thread's lease on life for another (server:get-timeout) seconds
;;(BB> "in api-exec; last-db-access updated to "*last-db-access*)
(mutex-unlock! *heartbeat-mutex*)
res))
;; (handle-exceptions
;; exn
;; (begin
;; (debug:print 0 *default-log-port* "Remote failed for " proc " " params " exn="exn)
;; (apply (eval (string->symbol procstr)) params))
;; ;; (if *runremote*
;; ;; (apply (eval (string->symbol (conc "remote:" procstr))) params)
;; (apply (eval (string->symbol procstr)) params)))
;; retry an operation (depends on srfi-18)
;; ==================
;; idea here is to avoid spending time on coding retrying something. Trying to be generic here.
;;
;; Exception handling:
;; -------------------
;; if evaluating the thunk results in exception, it will be retried.
;; on last try, if final-failure-returns-actual is true, the exception will be re-thrown to caller.
;;
;; look at options below #!key to see how to configure behavior
;;
;;
(define (retry-thunk
the-thunk
#!key ;;;; options below
(accept-result? (lambda (x) x)) ;; retry if predicate applied to thunk's result is false
(retries 4) ;; how many tries
(failure-value #f) ;; return this on final failure, unless following option is enabled:
(final-failure-returns-actual #f) ;; on failure, on the last try, just return the result, not failure-value
(retry-delay 0.1) ;; delay between tries
(back-off-factor 1) ;; multiply retry-delay by this factor on retry
(random-delay 0.1) ;; add a random portion of this value to wait
(chatty #f) ;; print status as we go, for debugging.
)
(when chatty (print) (print "Entered retry-thunk") (print "-=-=-=-=-=-"))
(let* ((guarded-thunk ;; we are guarding the thunk against exceptions. We will record whether result of evaluation is an exception or a regular result.
(lambda ()
(let* ((EXCEPTION (gensym)) ;; using gensym to avoid potential collision
(res
(condition-case
(the-thunk) ;; this is what we are guarding the execution of
[x () (cons EXCEPTION x)]
)))
(cond
((and (pair? res) (eq? (car res) EXCEPTION))
(if chatty
(print " - the-thunk threw exception >"(cdr res)"<"))
(cons 'exception (cdr res)))
(else
(if chatty
(print " - the-thunk returned result >"res"<"))
(cons 'regular-result res)))))))
(let loop ((guarded-res (guarded-thunk))
(retries-left retries)
(fail-wait retry-delay))
(if chatty (print " =========="))
(let* ((wait-time (+ fail-wait (+ (* fail-wait back-off-factor)
(* random-delay
(/ (random 1024) 1024) ))))
(res-type (car guarded-res))
(res-value (cdr guarded-res)))
(cond
((and (eq? res-type 'regular-result) (accept-result? res-value))
(if chatty (print " + return result that satisfied accept-result? >"res-value"<"))
res-value)
((> retries-left 0)
(if chatty (print " - sleep "wait-time))
(thread-sleep! wait-time)
(if chatty (print " + retry ["retries-left" tries left]"))
(loop (guarded-thunk)
(sub1 retries-left)
wait-time))
((eq? res-type 'regular-result)
(if final-failure-returns-actual
(begin
(if chatty (print " + last try failed- return the result >"res-value"<"))
res-value)
(begin
(if chatty (print " + last try failed- return canned failure value >"failure-value"<"))
failure-value)))
(else ;; no retries left; result was not accepted and res-type can only be 'exception
(if final-failure-returns-actual
(begin
(if chatty (print " + last try failed with exception- re-throw it >"res-value"<"))
(abort res-value)); re-raise the exception. TODO: find a way for call-history to show as though from entry to this function
(begin
(if chatty (print " + last try failed with exception- return canned failure value >"failure-value"<"))
failure-value))))))))
(define (rpc-transport:server-shutdown server-id rpc:listener #!key (from-on-exit #f))
(on-exit (lambda () #t)) ;; turn off on-exit stuff
;;(tcp-close rpc:listener) ;; gotta exit nicely
;;(tasks:bb-server-set-state! server-id "stopped")
;; TODO: (low) the following is extraordinaritly slow. Maybe we don't even need portlogger for rpc anyway?? the exception-based failover when ports are taken is fast!
;;(portlogger:open-run-close portlogger:set-port (rpc:default-server-port) "released")
(set! *time-to-exit* #t)
(if *inmemdb* (db:sync-touched *inmemdb* *run-id* force-sync: #t))
(tasks:bb-server-delete-record server-id " rpc-transport:keep-running complete")
;;(BB> "Before (exit) (from-on-exit="from-on-exit")")
(unless from-on-exit (exit)) ;; sometimes we hang (around) here with 100% cpu.
;;(BB> "After")
;; strace reveals endless:
;; getrusage(RUSAGE_SELF, {ru_utime={413, 917868}, ru_stime={0, 60003}, ...}) = 0
;; getrusage(RUSAGE_SELF, {ru_utime={414, 9874}, ru_stime={0, 60003}, ...}) = 0
;; getrusage(RUSAGE_SELF, {ru_utime={414, 13874}, ru_stime={0, 60003}, ...}) = 0
;; getrusage(RUSAGE_SELF, {ru_utime={414, 105880}, ru_stime={0, 60003}, ...}) = 0
;; getrusage(RUSAGE_SELF, {ru_utime={414, 109880}, ru_stime={0, 60003}, ...}) = 0
;; getrusage(RUSAGE_SELF, {ru_utime={414, 201886}, ru_stime={0, 60003}, ...}) = 0
;; getrusage(RUSAGE_SELF, {ru_utime={414, 205886}, ru_stime={0, 60003}, ...}) = 0
;; getrusage(RUSAGE_SELF, {ru_utime={414, 297892}, ru_stime={0, 60003}, ...}) = 0
;; getrusage(RUSAGE_SELF, {ru_utime={414, 301892}, ru_stime={0, 60003}, ...}) = 0
;; getrusage(RUSAGE_SELF, {ru_utime={414, 393898}, ru_stime={0, 60003}, ...}) = 0
;; getrusage(RUSAGE_SELF, {ru_utime={414, 397898}, ru_stime={0, 60003}, ...}) = 0
;; make a post to chicken-users w/ http://paste.call-cc.org/paste?id=60a4b66a29ccf7d11359ea866db642c970735978
(if from-on-exit
;; avoid above condition! End current process externally since 1 in 20 (exit)'s result in hung, 100% cpu zombies. (see above)
(system (conc "kill -9 "(current-process-id))))
)
;; all routes though here end in exit ...
;;
;; start_server?
;;
(define (rpc-transport:launch run-id)
(let* ((tdbdat (tasks:open-db)))
(BB> "rpc-transport:launch fired for run-id="run-id)
(set! *run-id* run-id)
(if (args:get-arg "-daemonize")
(daemon:ize))
(if (server:check-if-running run-id)
(begin
(debug:print 0 *default-log-port* "INFO: Server for run-id " run-id " already running")
(exit 0)))
(let loop ((server-id (tasks:server-lock-slot (db:delay-if-busy tdbdat) run-id))
(remtries 4))
(if (not server-id)
(if (> remtries 0)
(begin
(thread-sleep! 2)
(loop (tasks:server-lock-slot (db:delay-if-busy tdbdat) run-id)
(- remtries 1)))
(begin
;; since we didn't get the server lock we are going to clean up and bail out
(debug:print-info 2 *default-log-port* "INFO: server pid=" (current-process-id) ", hostname=" (get-host-name) " not starting due to other candidates ahead in start queue")
(tasks:server-delete-records-for-this-pid (db:delay-if-busy tdbdat) " rpc-transport:launch")))
(begin
(rpc-transport:run (if (args:get-arg "-server")(args:get-arg "-server") "-") run-id server-id)
(exit))))))
(rpc:publish-procedure! 'server:login server:login)
(rpc:publish-procedure! 'testing (lambda () "Just testing"))
(rpc:publish-procedure! 'server:login server:login) ;; this allows client to validate it is the same megatest instance as the server. No security here, just making sure we're in the right room.
(rpc:publish-procedure!
'testing
(lambda ()
"Just testing"))
;; procedure to receive arbitrary API request from client's rpc:send-receive/rpc-transport:client-api-send-receive
(rpc:publish-procedure! 'rpc-transport:autoremote rpc-transport:autoremote)
;; can use this to run most anything at the remote
(rpc:publish-procedure! 'api-exec rpc-transport:api-exec)
;;======================================================================
;; end of publish-procedure section
;;======================================================================
(let* ((db #f)
(hostname (get-host-name))
(ipaddrstr (let ((ipstr (if (string=? "-" hostn)
(hostname (let ((res (get-host-name))) res))
(server-start-time (current-seconds))
(server-timeout (server:get-timeout))
(ipaddrstr (let* ((ipstr (if (string=? "-" hostn)
;; (string-intersperse (map number->string (u8vector->list (hostname->ip hostname))) ".")
(server:get-best-guess-address hostname)
#f)))
(if ipstr ipstr hostn))) ;; hostname)))
(start-port (open-run-close tasks:server-get-next-port tasks:open-db))
#f))
(res (if ipstr ipstr hostn)))
res)) ;; hostname)))
(start-port (let ((res (portlogger:open-run-close portlogger:find-port))) ;; BB> TODO: remove portlogger!
res))
(link-tree-path (configf:lookup *configdat* "setup" "linktree"))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; rpc:listener is the tcp-listen result from inside the find-free-port-and-open complex.
;; It is our handle on the listening tcp port
;; We will attach this to our rpc server with rpc:make-server in thread th1 .
(rpc:listener (rpc-transport:find-free-port-and-open (rpc:default-server-port)))
(rpc:listener (rpc-transport:find-free-port-and-open start-port))
(th1 (make-thread
(lambda ()
((rpc:make-server rpc:listener) #t))
((rpc:make-server rpc:listener) #t) )
"rpc:server"))
;; (cute (rpc:make-server rpc:listener) "rpc:server")
;; 'rpc:server))
(hostname (if (string=? "-" hostn)
(portnum (rpc:default-server-port))
(host:port (conc (if ipaddrstr ipaddrstr hostname) ":" portnum))
(tdb (tasks:open-db)))
(portnum (let ((res (rpc:default-server-port))) res))
(host:port (conc (if ipaddrstr ipaddrstr hostname) ":" portnum)))
;; BB> TODO: remove portlogger!
;; if rpc found it needed a different port than portlogger provided, keep portlogger in the loop.
;; (when (not (equal? start-port portnum))
;; (BB> "portlogger proffered "start-port" but rpc grabbed "portnum)
;; (portlogger:open-run-close portlogger:set-port start-port "released")
;; (portlogger:open-run-close portlogger:take-port portnum))
(tasks:bb-server-set-interface-port server-id ipaddrstr portnum)
;;============================================================
;; activate thread th1 to attach opened tcp port to rpc server
;;=============================================================
(thread-start! th1)
(set! db *dbstruct-db*)
(open-run-close tasks:server-set-interface-port
(set! db *inmemdb*)
tasks:open-db
server-id
ipaddrstr portnum)
;; (trace rpc:publish-procedure!)
;; (rpc:publish-procedure! 'server:login server:login)
;; (rpc:publish-procedure! 'testing (lambda () "Just testing"))
;;======================================================================
;; ;; end of publish-procedure section
;;======================================================================
;;
(open-run-close tasks:server-set-state! tasks:open-db server-id "stopped")))
(set! *rpc:listener* rpc:listener)
(tasks:server-set-state! tdb server-id "running")
(set! *dbstruct-db* (db:setup run-id))
;; if none running or if > 20 seconds since
;; server last used then start shutdown
(let loop ((count 0))
(thread-sleep! 5) ;; no need to do this very often
(let ((numrunning -1)) ;; (db:get-count-tests-running db)))
(if (or (> numrunning 0)
(> (+ *db-last-access* 60)(current-seconds)))
(begin
(set! *rpc:listener* rpc:listener)
(tasks:bb-server-set-state! server-id "running") ;; update our mdb servers entry
;; this let loop will hold open this thread until we want the server to shut down.
;; if no requests received within the last 20 seconds :
;; database hasnt changed in ??
;;
;; begin new loop
;; keep-running loop: polls last-db-access to see if we have timed out.
(let loop ((count 0)
(bad-sync-count 0))
;; Use this opportunity to sync the inmemdb to db
(let ((start-time (current-milliseconds))
(sync-time #f)
(rem-time #f))
;; inmemdb is a dbstruct
(condition-case
(db:sync-touched *inmemdb* *run-id* force-sync: #t)
((sync-failed)(cond
((> bad-sync-count 10) ;; time to give up
(rpc-transport:server-shutdown server-id rpc:listener))
(else ;; (> bad-sync-count 0) ;; we've had a fail or two, delay and loop
(thread-sleep! 5)
(loop count (+ bad-sync-count 1)))))
((exn)
(debug:print-error 0 *default-log-port* "error from sync code other than 'sync-failed. Attempting to gracefully shutdown the server")
(rpc-transport:server-shutdown server-id rpc:listener)))
(set! sync-time (- (current-milliseconds) start-time))
(set! rem-time (quotient (- 4000 sync-time) 1000))
(debug:print 4 *default-log-port* "SYNC: time= " sync-time ", rem-time=" rem-time)
(if (and (<= rem-time 4)
(> rem-time 0))
(thread-sleep! rem-time)
(thread-sleep! 4))) ;; fallback for if the math is changed ...
(debug:print-info 0 *default-log-port* "Server continuing, tests running: " numrunning ", seconds since last db access: " (- (current-seconds) *db-last-access*))
(loop (+ 1 count)))
(begin
(debug:print-info 0 *default-log-port* "Starting to shutdown the server side")
(open-run-close tasks:server-delete-record tasks:open-db server-id " rpc-transport:try-start-server stop")
(thread-sleep! 10)
(debug:print-info 0 *default-log-port* "Max cached queries was " *max-cache-size*)
(debug:print-info 0 *default-log-port* "Server shutdown complete. Exiting")
))))))
(define (rpc-transport:find-free-port-and-open port)
(define (rpc-transport:find-free-port-and-open port #!key )
(handle-exceptions
exn
(begin
(rpc-transport:find-free-port-and-open (+ port 1)))
(rpc-transport:find-free-port-and-open (add1 port)))
(rpc:default-server-port port)
(set! *rpc-listener-port* port) ;; a bit paranoid about rpc:default-server-port parameter not changing across threads (as params are wont to do). keeping this global in my back pocket in case this causes problems
(set! *rpc-listener-port-bind-timestamp* (current-milliseconds)) ;; may want to test how long it has been since the last bind attempt happened...
(tcp-read-timeout 240000)
(tcp-buffer-size 0) ;; gotta do this because http-transport undoes it.
(tcp-listen (rpc:default-server-port) 10000)))
(tcp-listen (rpc:default-server-port) 10000)
))
(define (rpc-transport:ping run-id host port)
(handle-exceptions
exn
(begin
(print "SERVER_NOT_FOUND")
(print "SERVER_NOT_FOUND exn="exn)
(exit 1))
(let ((login-res ((rpc:procedure 'server:login host port) *toppath*)))
(if (and (list? login-res)
(car login-res))
(define (rpc-transport:client-setup run-id #!key (remtries 10))
(if *runremote*
(define (rpc-transport:self-test run-id host port)
(tcp-buffer-size 0) ;; gotta do this because http-transport undoes it.
(begin
(debug:print-error 0 *default-log-port* "Attempt to connect to server but already connected")
#f)
(let* ((host-info (hash-table-ref/default *runremote* run-id #f))) ;; (open-run-close db:get-var #f "SERVER"))
(if host-info
(let ((iface (car host-info))
(port (cadr host-info))
(ping-res ((rpc:procedure 'server:login host port) *toppath*)))
(if ping-res
(let ((server-dat (list iface port #f #f #f)))
(hash-table-set! *runremote* run-id server-dat)
server-dat)
(begin
(server:try-running run-id)
(thread-sleep! 2)
(rpc-transport:client-setup run-id (- remtries 1)))))
(let* ((server-db-info (open-run-close tasks:get-server tasks:open-db run-id)))
(debug:print-info 0 *default-log-port* "client:setup server-dat=" server-dat ", remaining-tries=" remaining-tries)
(if server-db-info
(let* ((iface (tasks:hostinfo-get-interface server-db-info))
(port (tasks:hostinfo-get-port server-db-info))
(server-dat (list iface port #f #f #f))
(ping-res ((rpc:procedure 'server:login host port) *toppath*)))
(if start-res
(begin
(hash-table-set! *runremote* run-id server-dat)
server-dat)
(begin
(server:try-running run-id)
(thread-sleep! 2)
(rpc-transport:client-setup run-id (- remtries 1)))))
(begin
(server:try-running run-id)
(thread-sleep! 2)
(rpc-transport:client-setup run-id (- remtries 1)))))))))
;;
;; (port (if (and hostinfo (> (length hostdat) 1))(cadr hostdat) #f)))
;; (if (and port
;; (string->number port))
;; (let ((portn (string->number port)))
;; (debug:print-info 2 *default-log-port* "Setting up to connect to host " host ":" port)
;; (handle-exceptions
;; exn
;; (begin
;; (debug:print-error 0 *default-log-port* "Failed to open a connection to the server at host: " host " port: " port)
;; (debug:print 0 *default-log-port* " EXCEPTION: " ((condition-property-accessor 'exn 'message) exn))
;; ;; (open-run-close
;; ;; (lambda (db . param)
;; ;; (sqlite3:execute db "DELETE FROM metadat WHERE var='SERVER'"))
;; ;; #f)
;; (set! *runremote* #f))
;; (if (and (not (args:get-arg "-server")) ;; no point in the server using the server using the server
;; ((rpc:procedure 'server:login host portn) *toppath*))
;; (begin
;; (debug:print-info 2 *default-log-port* "Logged in and connected to " host ":" port)
;; (set! *runremote* (vector host portn)))
;; (begin
;; (debug:print-info 2 *default-log-port* "Failed to login or connect to " host ":" port)
;; (set! *runremote* #f)))))
;; (debug:print-info 2 *default-log-port* "no server available")))))
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