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;; Call this to start the actual server
;;
(define *db:process-queue-mutex* (make-mutex))
(define (http-transport:run hostn run-id server-id)
(debug:print 2 "Attempting to start the server ...")
(debug:print 2 #f "Attempting to start the server ...")
(let* ((db #f) ;; (open-db)) ;; we don't want the server to be opening and closing the db unnecesarily
(hostname (get-host-name))
(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 (portlogger:open-run-close portlogger:find-port))
(link-tree-path (configf:lookup *configdat* "setup" "linktree")))
;; (set! db *inmemdb*)
(debug:print-info 0 "portlogger recommended port: " start-port)
(debug:print-info 0 #f "portlogger recommended port: " start-port)
(root-path (if link-tree-path
link-tree-path
(current-directory))) ;; WARNING: SECURITY HOLE. FIX ASAP!
(handle-directory spiffy-directory-listing)
(handle-exception (lambda (exn chain)
(signal (make-composite-condition
(make-property-condition
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(http-transport:try-start-server run-id ipaddrstr start-port server-id)))
;; This is recursively run by http-transport:run until sucessful
;;
(define (http-transport:try-start-server run-id ipaddrstr portnum server-id)
(let ((config-hostname (configf:lookup *configdat* "server" "hostname"))
(tdbdat (tasks:open-db)))
(debug:print-info 0 "http-transport:try-start-server run-id=" run-id " ipaddrsstr=" ipaddrstr " portnum=" portnum " server-id=" server-id " config-hostname=" config-hostname)
(debug:print-info 0 #f "http-transport:try-start-server run-id=" run-id " ipaddrsstr=" ipaddrstr " portnum=" portnum " server-id=" server-id " config-hostname=" config-hostname)
(handle-exceptions
exn
(begin
(print-error-message exn)
(if (< portnum 64000)
(begin
(debug:print 0 "WARNING: attempt to start server failed. Trying again ...")
(debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
(debug:print 0 "exn=" (condition->list exn))
(debug:print 0 #f "WARNING: attempt to start server failed. Trying again ...")
(debug:print 0 #f " message: " ((condition-property-accessor 'exn 'message) exn))
(debug:print 0 #f "exn=" (condition->list exn))
(portlogger:open-run-close portlogger:set-failed portnum)
(debug:print 0 "WARNING: failed to start on portnum: " portnum ", trying next port")
(debug:print 0 #f "WARNING: failed to start on portnum: " portnum ", trying next port")
(thread-sleep! 0.1)
;; get_next_port goes here
(http-transport:try-start-server run-id
ipaddrstr
(portlogger:open-run-close portlogger:find-port)
server-id))
(begin
(tasks:server-force-clean-run-record (db:delay-if-busy tdbdat) run-id ipaddrstr portnum " http-transport:try-start-server")
(print "ERROR: Tried and tried but could not start the server"))))
;; any error in following steps will result in a retry
(set! *server-info* (list ipaddrstr portnum))
(tasks:server-set-interface-port
(db:delay-if-busy tdbdat)
server-id
ipaddrstr portnum)
(debug:print 0 "INFO: Trying to start server on " ipaddrstr ":" portnum)
(debug:print 0 #f "INFO: Trying to start server on " ipaddrstr ":" portnum)
;; This starts the spiffy server
;; NEED WAY TO SET IP TO #f TO BIND ALL
;; (start-server bind-address: ipaddrstr port: portnum)
(if config-hostname ;; this is a hint to bind directly
(start-server port: portnum bind-address: (if (equal? config-hostname "-")
ipaddrstr
config-hostname))
(start-server port: portnum))
;; (portlogger:open-run-close portlogger:set-port portnum "released")
(tasks:server-force-clean-run-record (db:delay-if-busy tdbdat) run-id ipaddrstr portnum " http-transport:try-start-server")
(debug:print 1 "INFO: server has been stopped"))))
(debug:print 1 #f "INFO: server has been stopped"))))
;;======================================================================
;; S E R V E R U T I L I T I E S
;;======================================================================
;;======================================================================
;; C L I E N T S
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(define (http-transport:inc-requests-count)
(mutex-lock! *http-mutex*)
(set! *http-requests-in-progress* (+ 1 *http-requests-in-progress*))
;; Use this opportunity to slow things down iff there are too many requests in flight
(if (> *http-requests-in-progress* 5)
(begin
(debug:print-info 0 "Whoa there buddy, ease up...")
(debug:print-info 0 #f "Whoa there buddy, ease up...")
(thread-sleep! 1)))
(mutex-unlock! *http-mutex*))
(define (http-transport:dec-requests-count proc)
(mutex-lock! *http-mutex*)
(proc)
(set! *http-requests-in-progress* (- *http-requests-in-progress* 1))
(mutex-unlock! *http-mutex*))
(define (http-transport:dec-requests-count-and-close-all-connections)
(set! *http-requests-in-progress* (- *http-requests-in-progress* 1))
(let loop ((etime (+ (current-seconds) 5))) ;; give up in five seconds
(if (> *http-requests-in-progress* 0)
(if (> etime (current-seconds))
(begin
(thread-sleep! 0.05)
(loop etime))
(debug:print 0 "ERROR: requests still in progress after 5 seconds of waiting. I'm going to pass on cleaning up http connections"))
(debug:print 0 #f "ERROR: requests still in progress after 5 seconds of waiting. I'm going to pass on cleaning up http connections"))
(close-all-connections!)))
(set! *http-connections-next-cleanup* (+ (current-seconds) 10))
(mutex-unlock! *http-mutex*))
(define (http-transport:inc-requests-and-prep-to-close-all-connections)
(mutex-lock! *http-mutex*)
(set! *http-requests-in-progress* (+ 1 *http-requests-in-progress*)))
;; Send "cmd" with json payload "params" to serverdat and receive result
;;
(define (http-transport:client-api-send-receive run-id serverdat cmd params #!key (numretries 3))
(let* ((fullurl (if (vector? serverdat)
(http-transport:server-dat-get-api-req serverdat)
(begin
(debug:print 0 "FATAL ERROR: http-transport:client-api-send-receive called with no server info")
(debug:print 0 #f "FATAL ERROR: http-transport:client-api-send-receive called with no server info")
(exit 1))))
(res #f)
(success #t)
(sparams (db:obj->string params transport: 'http)))
;; (condition-case
;; handle-exceptions
;; exn
;; (if (> numretries 0)
;; (begin
;; (mutex-unlock! *http-mutex*)
;; (thread-sleep! 1)
;; (handle-exceptions
;; exn
;; (debug:print 0 "WARNING: closing connections failed. Server at " fullurl " almost certainly dead")
;; (debug:print 0 #f "WARNING: closing connections failed. Server at " fullurl " almost certainly dead")
;; (close-all-connections!))
;; (debug:print 0 "WARNING: Failed to communicate with server, trying again, numretries left: " numretries)
;; (debug:print 0 #f "WARNING: Failed to communicate with server, trying again, numretries left: " numretries)
;; (http-transport:client-api-send-receive run-id serverdat cmd sparams numretries: (- numretries 1)))
;; (begin
;; (mutex-unlock! *http-mutex*)
;; (tasks:kill-server-run-id run-id)
;; #f))
;; (begin
(debug:print-info 11 "fullurl=" fullurl ", cmd=" cmd ", params=" params ", run-id=" run-id "\n")
(debug:print-info 11 #f "fullurl=" fullurl ", cmd=" cmd ", params=" params ", run-id=" run-id "\n")
;; set up the http-client here
(max-retry-attempts 1)
;; consider all requests indempotent
(retry-request? (lambda (request)
#f))
;; send the data and get the response
;; extract the needed info from the http data and
;; process and return it.
(let* ((send-recieve (lambda ()
(mutex-lock! *http-mutex*)
;; (condition-case (with-input-from-request "http://localhost"; #f read-lines)
;; ((exn http client-error) e (print e)))
(set! res (vector
success
(db:string->obj
(handle-exceptions
exn
(begin
(set! success #f)
(debug:print 0 "WARNING: failure in with-input-from-request to " fullurl ".")
(debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
(debug:print 0 #f "WARNING: failure in with-input-from-request to " fullurl ".")
(debug:print 0 #f " message: " ((condition-property-accessor 'exn 'message) exn))
(hash-table-delete! *runremote* run-id)
;; Killing associated server to allow clean retry.")
;; (tasks:kill-server-run-id run-id) ;; better to kill the server in the logic that called this routine?
(mutex-unlock! *http-mutex*)
;;; (signal (make-composite-condition
;;; (make-property-condition 'commfail 'message "failed to connect to server")))
;;; "communications failed"
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#f))
(th1 (make-thread send-recieve "with-input-from-request"))
(th2 (make-thread time-out "time out")))
(thread-start! th1)
(thread-start! th2)
(thread-join! th1)
(thread-terminate! th2)
(debug:print-info 11 "got res=" res)
(debug:print-info 11 #f "got res=" res)
(if (vector? res)
(if (vector-ref res 0)
res
(begin ;; note: this code also called in nmsg-transport - consider consolidating it
(debug:print 0 "ERROR: error occured at server, info=" (vector-ref res 2))
(debug:print 0 " client call chain:")
(debug:print 0 #f "ERROR: error occured at server, info=" (vector-ref res 2))
(debug:print 0 #f " client call chain:")
(print-call-chain (current-error-port))
(debug:print 0 " server call chain:")
(debug:print 0 #f " server call chain:")
(pp (vector-ref res 1) (current-error-port))
(signal (vector-ref result 0))))
(signal (make-composite-condition
(make-property-condition
'timeout
'message "nmsg-transport:client-api-send-receive-raw timed out talking to server")))))))
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#f))
(define (http-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 0 "ERROR: call to http-transport:server-dat-update-last-access with non-vector!!"))))
(debug:print 0 #f "ERROR: call to http-transport:server-dat-update-last-access with non-vector!!"))))
;;
;; connect
;;
(define (http-transport:client-connect iface port)
(let* ((api-url (conc "http://" iface ":" port "/api"))
(api-uri (uri-reference (conc "http://" iface ":" port "/api")))
(api-req (make-request method: 'POST uri: api-uri))
(server-dat (vector iface port api-uri api-url api-req (current-seconds))))
server-dat))
;; run http-transport:keep-running in a parallel thread to monitor that the db is being
;; used and to shutdown after sometime if it is not.
;;
(define (http-transport:keep-running server-id run-id)
;; if none running or if > 20 seconds since
;; server last used then start shutdown
;; This thread waits for the server to come alive
(debug:print-info 0 "Starting the sync-back, keep alive thread in server for run-id=" run-id)
(debug:print-info 0 #f "Starting the sync-back, keep alive thread in server for run-id=" run-id)
(let* ((tdbdat (tasks:open-db))
(server-start-time (current-seconds))
(server-info (let loop ((start-time (current-seconds))
(changed #t)
(last-sdat "not this"))
(let ((sdat #f))
(thread-sleep! 0.01)
(debug:print-info 0 "Waiting for server alive signature")
(debug:print-info 0 #f "Waiting for server alive signature")
(mutex-lock! *heartbeat-mutex*)
(set! sdat *server-info*)
(mutex-unlock! *heartbeat-mutex*)
(if (and sdat
(not changed)
(> (- (current-seconds) start-time) 2))
sdat
(begin
(debug:print-info 0 "Still waiting, last-sdat=" last-sdat)
(debug:print-info 0 #f "Still waiting, last-sdat=" last-sdat)
(sleep 4)
(if (> (- (current-seconds) start-time) 120) ;; been waiting for two minutes
(begin
(debug:print 0 "ERROR: transport appears to have died, exiting server " server-id " for run " run-id)
(debug:print 0 #f "ERROR: transport appears to have died, exiting server " server-id " for run " run-id)
(tasks:server-delete-record (db:delay-if-busy tdbdat) server-id "failed to start, never received server alive signature")
(exit))
(loop start-time
(equal? sdat last-sdat)
sdat)))))))
(iface (car server-info))
(port (cadr server-info))
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((sync-failed)(cond
((> bad-sync-count 10) ;; time to give up
(http-transport:server-shutdown server-id port))
(else ;; (> bad-sync-count 0) ;; we've had a fail or two, delay and loop
(thread-sleep! 5)
(loop count server-state (+ bad-sync-count 1)))))
((exn)
(debug:print 0 "ERROR: error from sync code other than 'sync-failed. Attempting to gracefully shutdown the server")
(debug:print 0 #f "ERROR: error from sync code other than 'sync-failed. Attempting to gracefully shutdown the server")
(tasks:server-delete-record (db:delay-if-busy tdbdat) server-id " http-transport:keep-running crashed")
(exit)))
(set! sync-time (- (current-milliseconds) start-time))
(set! rem-time (quotient (- 4000 sync-time) 1000))
(debug:print 4 "SYNC: time= " sync-time ", rem-time=" rem-time)
(debug:print 4 #f "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 ...
;;
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(mutex-lock! *heartbeat-mutex*)
(set! sdat *server-info*)
(mutex-unlock! *heartbeat-mutex*)
(if (or (not (equal? sdat (list iface port)))
(not server-id))
(begin
(debug:print-info 0 "interface changed, refreshing iface and port info")
(debug:print-info 0 #f "interface changed, refreshing iface and port info")
(set! iface (car sdat))
(set! port (cadr sdat))))
;; Transfer *last-db-access* to last-access to use in checking that we are still alive
(mutex-lock! *heartbeat-mutex*)
(set! last-access *last-db-access*)
(mutex-unlock! *heartbeat-mutex*)
;; (debug:print 11 "last-access=" last-access ", server-timeout=" server-timeout)
;; (debug:print 11 #f "last-access=" last-access ", server-timeout=" server-timeout)
;;
;; no_traffic, no running tests, if server 0, no running servers
;;
;; (let ((wait-on-running (configf:lookup *configdat* "server" b"wait-on-running"))) ;; wait on running tasks (if not true then exit on time out)
;;
(let* ((hrs-since-start (/ (- (current-seconds) server-start-time) 3600))
(adjusted-timeout (if (> hrs-since-start 1)
(- server-timeout (inexact->exact (round (* hrs-since-start 60)))) ;; subtract 60 seconds per hour
server-timeout)))
(if (common:low-noise-print 120 "server timeout")
(debug:print-info 0 "Adjusted server timeout: " adjusted-timeout))
(debug:print-info 0 #f "Adjusted server timeout: " adjusted-timeout))
(if (and *server-run*
(> (+ last-access server-timeout)
(current-seconds)))
(begin
(if (common:low-noise-print 120 "server continuing")
(debug:print-info 0 "Server continuing, seconds since last db access: " (- (current-seconds) last-access)))
(debug:print-info 0 #f "Server continuing, seconds since last db access: " (- (current-seconds) last-access)))
;;
;; Consider implementing some smarts here to re-insert the record or kill self is
;; the db indicates so
;;
;; (if (tasks:server-am-i-the-server? tdb run-id)
;; (tasks:server-set-state! tdb server-id "running"))
;;
(loop 0 server-state bad-sync-count))
(http-transport:server-shutdown server-id port))))))
(define (http-transport:server-shutdown server-id port)
(let ((tdbdat (tasks:open-db)))
(debug:print-info 0 "Starting to shutdown the server.")
(debug:print-info 0 #f "Starting to shutdown the server.")
;; need to delete only *my* server entry (future use)
(set! *time-to-exit* #t)
(if *inmemdb* (db:sync-touched *inmemdb* *run-id* force-sync: #t))
;;
;; start_shutdown
;;
(tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "shutting-down")
(portlogger:open-run-close portlogger:set-port port "released")
(thread-sleep! 5)
(debug:print-info 0 "Max cached queries was " *max-cache-size*)
(debug:print-info 0 "Number of cached writes " *number-of-writes*)
(debug:print-info 0 "Average cached write time "
(debug:print-info 0 #f "Max cached queries was " *max-cache-size*)
(debug:print-info 0 #f "Number of cached writes " *number-of-writes*)
(debug:print-info 0 #f "Average cached write time "
(if (eq? *number-of-writes* 0)
"n/a (no writes)"
(/ *writes-total-delay*
*number-of-writes*))
" ms")
(debug:print-info 0 "Number non-cached queries " *number-non-write-queries*)
(debug:print-info 0 "Average non-cached time "
(debug:print-info 0 #f "Number non-cached queries " *number-non-write-queries*)
(debug:print-info 0 #f "Average non-cached time "
(if (eq? *number-non-write-queries* 0)
"n/a (no queries)"
(/ *total-non-write-delay*
*number-non-write-queries*))
" ms")
(debug:print-info 0 "Server shutdown complete. Exiting")
(debug:print-info 0 #f "Server shutdown complete. Exiting")
(tasks:server-delete-record (db:delay-if-busy tdbdat) server-id " http-transport:keep-running complete")
(exit)))
;; all routes though here end in exit ...
;;
;; start_server?
;;
(define (http-transport:launch run-id)
(let* ((tdbdat (tasks:open-db)))
(set! *run-id* run-id)
(if (args:get-arg "-daemonize")
(begin
(daemon:ize)
(if *alt-log-file* ;; we should re-connect to this port, I think daemon:ize disrupts it
(begin
(current-error-port *alt-log-file*)
(current-output-port *alt-log-file*)))))
(if (server:check-if-running run-id)
(begin
(debug:print 0 "INFO: Server for run-id " run-id " already running")
(debug:print 0 #f "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 "INFO: server pid=" (current-process-id) ", hostname=" (get-host-name) " not starting due to other candidates ahead in start queue")
(debug:print-info 2 #f "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) " http-transport:launch")
))
(let* ((th2 (make-thread (lambda ()
(debug:print-info 0 "Server run thread started")
(debug:print-info 0 #f "Server run thread started")
(http-transport:run
(if (args:get-arg "-server")
(args:get-arg "-server")
"-")
run-id
server-id)) "Server run"))
(th3 (make-thread (lambda ()
(debug:print-info 0 "Server monitor thread started")
(debug:print-info 0 #f "Server monitor thread started")
(http-transport:keep-running server-id run-id))
"Keep running")))
(thread-start! th2)
(thread-sleep! 0.25) ;; give the server time to settle before starting the keep-running monitor.
(thread-start! th3)
(set! *didsomething* #t)
(thread-join! th2)
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(print "LOGIN_FAILED")
(exit 1)))))
(define (http-transport:server-signal-handler signum)
(signal-mask! signum)
(handle-exceptions
exn
(debug:print " ... exiting ...")
(debug:print 0 #f " ... exiting ...")
(let ((th1 (make-thread (lambda ()
(thread-sleep! 1))
"eat response"))
(th2 (make-thread (lambda ()
(debug:print 0 "ERROR: Received ^C, attempting clean exit. Please be patient and wait a few seconds before hitting ^C again.")
(debug:print 0 #f "ERROR: Received ^C, attempting clean exit. Please be patient and wait a few seconds before hitting ^C again.")
(thread-sleep! 3) ;; give the flush three seconds to do it's stuff
(debug:print 0 " Done.")
(debug:print 0 #f " Done.")
(exit 4))
"exit on ^C timer")))
(thread-start! th2)
(thread-start! th1)
(thread-join! th2))))
;;======================================================================
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