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(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)))
;; retry an operation (depends on srfi-18)
(define (retry-thunk the-thunk #!key (accept-result? (lambda (x) x)) (retries 4) (wait-seconds-between-tries 0.2) (failure-value #f))
(let loop ((res (the-thunk)) (retries-left retries))
(cond
((accept-result? res) res)
((> retries-left 0)
(thread-sleep! wait-seconds-between-tries)
(loop (the-thunk) (sub1 retries-left)))
(else failure-value))))
(define (rpc-transport:server-shutdown server-id rpc:listener #!key (from-on-exit #f))
(BB> "rpc-transport:server-shutdown entered.")
(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!
;;(BB> "before plog rel")
;;(portlogger:open-run-close portlogger:set-port (rpc:default-server-port) "released")
(set! *time-to-exit* #t)
(BB> "before db:sync-touched")
(if *inmemdb* (db:sync-touched *inmemdb* *run-id* force-sync: #t))
(BB> "before bb-server-delete-record")
(tasks:bb-server-delete-record server-id " rpc-transport:keep-running complete")
(BB> "Before (exit)")
(unless from-on-exit (exit))
)
;; all routes though here end in exit ...
;;
;; start_server?
;;
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(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)
(print "BB> rpc-transport:autoremote entered with procstr="procstr" params="params" string?"(string? procstr)" symbol?"(symbol? procstr)" list?"(list? params) )
(let* ((procsym (if (symbol? procstr)
procstr
(string->symbol (->string procstr))))
(res
(begin (print "BB>before apply") (apply (eval procsym) params))))
(print "BB> after apply; rpc-transport res="res)
res
))
;; rpc receiver
(define (rpc-transport:api-exec cmd params)
(BB> "rpc-transport:api-exec cmd="cmd" params="params" inmemdb="*inmemdb*)
(let* ( (resdat (api:execute-requests *inmemdb* (vector cmd params))) ;; #( flag result )
(flag (vector-ref resdat 0))
(res (vector-ref resdat 1)))
(BB> "rpc-transport:api-exec flag="flag" res="res)
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))
(BB> "rpc-transport:server-shutdown entered.")
(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!
;;(BB> "before plog rel")
;;(portlogger:open-run-close portlogger:set-port (rpc:default-server-port) "released")
(set! *time-to-exit* #t)
(BB> "before db:sync-touched")
(if *inmemdb* (db:sync-touched *inmemdb* *run-id* force-sync: #t))
(BB> "before bb-server-delete-record")
(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?
;;
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(debug:print 0 *default-log-port* "INFO: Server for run-id " run-id " already running")
(exit 0))
;; let's get a server-id for this server
;; if at first we do not suceed, try 3 more times.
(let ((server-id (retry-thunk
(lambda () (tasks:bb-server-lock-slot run-id 'rpc))
retries: 4)))
(when (not server-id) ;; dang we couldn't get a server-id.
;; 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:bb-server-delete-records-for-this-pid " rpc-transport:launch")
(exit 1))
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(debug:print 0 *default-log-port* "INFO: Server for run-id " run-id " already running")
(exit 0))
;; let's get a server-id for this server
;; if at first we do not suceed, try 3 more times.
(let ((server-id (retry-thunk
(lambda () (tasks:bb-server-lock-slot run-id 'rpc))
chatty: #t
retries: 4)))
(when (not server-id) ;; dang we couldn't get a server-id.
;; 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:bb-server-delete-records-for-this-pid " rpc-transport:launch")
(exit 1))
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server-id)
(exit)))
(define *rpc-listener-port* #f)
(define *rpc-listener-port-bind-timestamp* #f)
(define *on-exit-flag #f)
(define (rpc-transport:run hostn run-id server-id)
(BB> "rpc-transport:run fired for hostn="hostn" run-id="run-id" server-id="server-id)
(debug:print 2 *default-log-port* "Attempting to start the rpc server ...")
;; (trace rpc:publish-procedure!)
;;======================================================================
;; start of publish-procedure section
;;======================================================================
(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.
(BB> "published 'testing")
(rpc:publish-procedure!
'testing
(lambda ()
(BB> "Current-peer=["(rpc:current-peer)"]")
(BB> "published rpc proc 'testing was invoked")
"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!
'remote:run
(lambda (procstr . params)
(server:autoremote procstr params)))
;;======================================================================
;; end of publish-procedure section
;;======================================================================
(BB> "flag1")
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server-id)
(exit)))
(define *rpc-listener-port* #f)
(define *rpc-listener-port-bind-timestamp* #f)
(define *on-exit-flag #f)
(define (rpc-transport:server-dat-get-iface vec) (vector-ref vec 0))
(define (rpc-transport:server-dat-get-port vec) (vector-ref vec 1))
(define (rpc-transport:server-dat-get-last-access vec) (vector-ref vec 5))
(define (rpc-transport:server-dat-get-transport vec) (vector-ref vec 6))
(define (rpc-transport:server-dat-update-last-access vec)
(if (vector? vec)
(vector-set! vec 5 (current-seconds))
(begin
(print-call-chain (current-error-port))
(debug:print-error 0 *default-log-port* "call to rpc-transport:server-dat-update-last-access with non-vector!!"))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; this client-side procedure makes rpc call to server and returns result
;;
(define (rpc-transport:client-api-send-receive run-id serverdat cmd params #!key (numretries 3))
(let* ((iface (rpc-transport:server-dat-get-iface serverdat))
(port (rpc-transport:server-dat-get-port serverdat))
(res #f)
(run-remote (rpc:procedure 'rpc-transport:autoremote iface port))
(api-exec (rpc:procedure 'api-exec iface port))
(send-receive (lambda ()
(tcp-buffer-size 0)
(BB> "Entered SR run-id="run-id" cmd="cmd" params="params" iface="iface" port="port)
(set! res (retry-thunk
(lambda ()
(condition-case
;;(vector #t (run-remote cmd params))
(vector 'success (api-exec cmd params))
[x (exn i/o net) (vector 'comms-fail (conc "communications fail ["(->string x)"]") x)]
[x () (vector 'other-fail "other fail ["(->string x)"]" x)]))
chatty: #t
accept-result?: (lambda(x)
(and (vector? x) (vector-ref x 0)))
retries: 4
back-off-factor: 1.5
random-wait: 0.2
retry-delay: 0.1
final-failure-returns-actual: #t))
(BB> "Leaving SR w/ "res)
res
))
(th1 (make-thread send-receive "send-receive"))
(time-out-reached #f)
(time-out (lambda ()
(thread-sleep! 45)
(set! time-out-reached #t)
(thread-terminate! th1)
#f))
(th2 (make-thread time-out "time out")))
(thread-start! th1)
(thread-start! th2)
(thread-join! th1)
(thread-terminate! th2)
(debug:print-info 11 *default-log-port* "got res=" res)
(if (vector? res)
(case (vector-ref res 0)
((success) (vector #t (vector-ref res 1)))
((comms-fail)
(debug:print 0 *default-log-port* "WARNING: comms failure for rpc request")
;;(debug:print 0 *default-log-port* " message: " ((condition-property-accessor 'exn 'message) exn))
(vector #f (vector-ref res 1)))
(else
(BB> "res="res)
(debug:print-error 0 *default-log-port* "error occured at server, info=" (vector-ref res 1))
(debug:print 0 *default-log-port* " client call chain:")
(print-call-chain (current-error-port))
(debug:print 0 *default-log-port* " server call chain:")
(pp (vector-ref res 1) (current-error-port))
(signal (vector-ref res 2))))
(signal (make-composite-condition
(make-property-condition
'timeout
'message "nmsg-transport:client-api-send-receive-raw timed out talking to server"))))))
(define (rpc-transport:run hostn run-id server-id)
(BB> "rpc-transport:run fired for hostn="hostn" run-id="run-id" server-id="server-id)
(debug:print 2 *default-log-port* "Attempting to start the rpc server ...")
;; (trace rpc:publish-procedure!)
;;======================================================================
;; start of publish-procedure section
;;======================================================================
(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.
(BB> "published 'testing")
(rpc:publish-procedure!
'testing
(lambda ()
(BB> "Current-peer=["(rpc:current-peer)"]")
(BB> "published rpc proc 'testing was invoked")
"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 (let ((res (get-host-name))) (BB> "hostname="res) 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)
|