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;; PURPOSE.
(require-extension (srfi 18) extras tcp s11n)
(use sqlite3 srfi-1 posix regex regex-case srfi-69 hostinfo md5 message-digest)
(import (prefix sqlite3 sqlite3:))
(use spiffy uri-common intarweb http-client spiffy-request-vars)
(tcp-buffer-size 2048)
(declare (unit http-transport))
(declare (uses common))
(declare (uses db))
(declare (uses tests))
(declare (uses tasks)) ;; tasks are where stuff is maintained about what is running.
(declare (uses server))
(include "common_records.scm")
(include "db_records.scm")
(define (http-transport:make-server-url hostport)
(if (not hostport)
#f
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;; PURPOSE.
(require-extension (srfi 18) extras tcp s11n)
(use sqlite3 srfi-1 posix regex regex-case srfi-69 hostinfo md5 message-digest)
(import (prefix sqlite3 sqlite3:))
(use spiffy uri-common intarweb http-client spiffy-request-vars uri-common intarweb)
;; Configurations for server
(tcp-buffer-size 2048)
(max-connections 2048)
(declare (unit http-transport))
(declare (uses common))
(declare (uses db))
(declare (uses tests))
(declare (uses tasks)) ;; tasks are where stuff is maintained about what is running.
(declare (uses server))
(declare (uses daemon))
(include "common_records.scm")
(include "db_records.scm")
(define (http-transport:make-server-url hostport)
(if (not hostport)
#f
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;;======================================================================
;; Call this to start the actual server
;;
(define *db:process-queue-mutex* (make-mutex))
(define (http-transport:run hostn)
(debug:print 2 "Attempting to start the server ...")
(if (not *toppath*)
(if (not (setup-for-run))
(begin
(debug:print 0 "ERROR: cannot find megatest.config, cannot start server, exiting")
(exit))))
(let* (;; (iface (if (string=? "-" hostn)
;; #f ;; (get-host-name)
;; hostn))
(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))) ".")
#f)))
(if ipstr ipstr hostn))) ;; hostname)))
(start-port (if (and (args:get-arg "-port")
(string->number (args:get-arg "-port")))
(string->number (args:get-arg "-port"))
(if (and (config-lookup *configdat* "server" "port")
(string->number (config-lookup *configdat* "server" "port")))
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;;======================================================================
;; Call this to start the actual server
;;
(define *db:process-queue-mutex* (make-mutex))
(define (server:get-best-guess-address hostname)
(let ((res #f))
(for-each
(lambda (adr)
(if (not (eq? (u8vector-ref adr 0) 127))
(set! res adr)))
(vector->list (hostinfo-addresses (hostname->hostinfo hostname))))
(string-intersperse
(map number->string
(u8vector->list
(if res res (hostname->ip hostname)))) ".")))
(define (http-transport:run hostn)
(debug:print 2 "Attempting to start the server ...")
(if (not *toppath*)
(if (not (setup-for-run))
(begin
(debug:print 0 "ERROR: cannot find megatest.config, cannot start server, exiting")
(exit))))
(let* (;; (iface (if (string=? "-" hostn)
;; #f ;; (get-host-name)
;; hostn))
(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 (if (and (args:get-arg "-port")
(string->number (args:get-arg "-port")))
(string->number (args:get-arg "-port"))
(if (and (config-lookup *configdat* "server" "port")
(string->number (config-lookup *configdat* "server" "port")))
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(define (http-transport:try-start-server ipaddrstr portnum)
(handle-exceptions
exn
(begin
(print-error-message exn)
(if (< portnum 9000)
(begin
(print "WARNING: failed to start on portnum: " portnum ", trying next port")
(thread-sleep! 0.1)
;; (open-run-close tasks:remove-server-records tasks:open-db)
(open-run-close tasks:server-delete tasks:open-db ipaddrstr portnum)
(http-transport:try-start-server ipaddrstr (+ portnum 1)))
(print "ERROR: Tried and tried but could not start the server")))
;; any error in following steps will result in a retry
(set! *runremote* (list ipaddrstr portnum))
;; (open-run-close tasks:remove-server-records tasks:open-db)
(open-run-close tasks:server-register
tasks:open-db
(current-process-id)
ipaddrstr portnum 0 'live 'http)
(print "INFO: Trying to start server on " ipaddrstr ":" portnum)
;; This starts the spiffy server
(start-server port: portnum)
(open-run-close tasks:server-delete tasks:open-db ipaddrstr portnum)
(print "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
;;======================================================================
;; <html>
;; <head></head>
;; <body>1 Hello, world! Goodbye Dolly</body></html>
;; Send msg to serverdat and receive result
(define (http-transport:client-send-receive serverdat msg)
(let* ((url (http-transport:make-server-url serverdat))
(fullurl (conc url "/ctrl")) ;; (conc url "/?dat=" msg)))
(numretries 0))
(handle-exceptions
exn
(if (< numretries 200)
(http-transport:client-send-receive serverdat msg))
(begin
(debug:print-info 11 "fullurl=" fullurl "\n")
;; set up the http-client here
(max-retry-attempts 100)
(retry-request? (lambda (request)
(thread-sleep! (/ (if (> numretries 100) 100 numretries) 10))
(set! numretries (+ numretries 1))
#t))
;; send the data and get the response
;; extract the needed info from the http data and
;; process and return it.
(let* ((res (with-input-from-request fullurl
;; #f
;; msg
(list (cons 'dat msg))
read-string)))
(serverdat (list iface port)))
(set! login-res (client:login serverdat))
(if (and (not (null? login-res))
(car login-res))
(begin
(debug:print-info 2 "Logged in and connected to " iface ":" port)
(set! *runremote* serverdat)
serverdat)
(begin
(debug:print-info 2 "Failed to login or connect to " iface ":" port)
(set! *runremote* #f)
#f))))
;; 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)
;; if none running or if > 20 seconds since
;; server last used then start shutdown
;; This thread waits for the server to come alive
(let* ((server-info (let loop ()
(let ((sdat #f))
(mutex-lock! *heartbeat-mutex*)
(set! sdat *runremote*)
(mutex-unlock! *heartbeat-mutex*)
(if sdat sdat
(begin
(sleep 4)
(loop))))))
(iface (car server-info))
(port (cadr server-info))
(last-access 0)
(tdb (tasks:open-db))
(spid (tasks:server-get-server-id tdb #f iface port #f))
(server-timeout (let ((tmo (config-lookup *configdat* "server" "timeout")))
(if (and (string? tmo)
(string->number tmo))
(* 60 60 (string->number tmo))
;; default to three days
(* 3 24 60)))))
(debug:print-info 2 "server-timeout: " server-timeout ", server pid: " spid " on " iface ":" port)
(let loop ((count 0))
(thread-sleep! 4) ;; no need to do this very often
;; NB// sync currently does NOT return queue-length
(let () ;; (queue-len (cdb:client-call server-info 'sync #t 1)))
;; (print "Server running, count is " count)
(if (< count 1) ;; 3x3 = 9 secs aprox
(loop (+ count 1)))
;; Check that iface and port have not changed (can happen if server port collides)
(mutex-lock! *heartbeat-mutex*)
(set! sdat *runremote*)
(mutex-unlock! *heartbeat-mutex*)
(if (not (equal? sdat (list iface port)))
(begin
(debug:print-info 1 "interface changed, refreshing iface and port info")
(set! iface (car sdat))
(set! port (cadr sdat))
(set! spid (tasks:server-get-server-id tdb #f iface port #f))))
;; NOTE: Get rid of this mechanism! It really is not needed...
(tasks:server-update-heartbeat tdb spid)
;; (if ;; (or (> numrunning 0) ;; stay alive for two days after last access
(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)
(if (> (+ last-access server-timeout)
(current-seconds))
(begin
(debug:print-info 2 "Server continuing, seconds since last db access: " (- (current-seconds) last-access))
(loop 0))
(begin
(debug:print-info 0 "Starting to shutdown the server.")
;; need to delete only *my* server entry (future use)
(set! *time-to-exit* #t)
(tasks:server-deregister-self tdb (get-host-name))
(thread-sleep! 1)
(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 "
(if (eq? *number-of-writes* 0)
"n/a (no writes)"
(/ *writes-total-delay*
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(define (http-transport:try-start-server ipaddrstr portnum)
(handle-exceptions
exn
(begin
(print-error-message exn)
(if (< portnum 9000)
(begin
(debug:print 0 "WARNING: failed to start on portnum: " portnum ", trying next port")
(thread-sleep! 0.1)
;; (open-run-close tasks:remove-server-records tasks:open-db)
(open-run-close tasks:server-delete tasks:open-db ipaddrstr portnum)
(http-transport:try-start-server ipaddrstr (+ portnum 1)))
(print "ERROR: Tried and tried but could not start the server")))
;; any error in following steps will result in a retry
(set! *runremote* (list ipaddrstr portnum))
;; (open-run-close tasks:remove-server-records tasks:open-db)
(open-run-close tasks:server-register
tasks:open-db
(current-process-id)
ipaddrstr portnum 0 'startup 'http)
(debug:print 1 "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)
(open-run-close tasks:server-delete tasks:open-db ipaddrstr portnum)
(debug:print 1 "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
;;======================================================================
(define *http-mutex* (make-mutex))
;; (system "megatest -list-servers | grep alive || megatest -server - -daemonize && sleep 4")
;; <html>
;; <head></head>
;; <body>1 Hello, world! Goodbye Dolly</body></html>
;; Send msg to serverdat and receive result
(define (http-transport:client-send-receive serverdat msg #!key (numretries 30))
(let* (;; (url (http-transport:make-server-url serverdat))
(fullurl (caddr serverdat)) ;; (conc url "/ctrl")) ;; (conc url "/?dat=" msg)))
(res #f))
(handle-exceptions
exn
(begin
(print "ERROR IN http-transport:client-send-receive " ((condition-property-accessor 'exn 'message) exn))
(thread-sleep! 2)
(if (> numretries 0)
(http-transport:client-send-receive serverdat msg numretries: (- numretries 1))))
(begin
(debug:print-info 11 "fullurl=" fullurl "\n")
;; set up the http-client here
(max-retry-attempts 5)
;; consider all requests indempotent
(retry-request? (lambda (request)
#t)) ;; (thread-sleep! (/ (if (> numretries 100) 100 numretries) 10))
;; (set! numretries (- numretries 1))
;; #t))
;; 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*)
(set! res (with-input-from-request
fullurl
(list (cons 'dat msg))
read-string))
(close-all-connections!)
(mutex-unlock! *http-mutex*)))
(time-out (lambda ()
(thread-sleep! 5)
(if (not res)
(begin
(debug:print 0 "WARNING: communication with the server timed out.")
(mutex-unlock! *http-mutex*)
(http-transport:client-send-receive serverdat msg numretries: (- numretries 1))
(if (< numretries 3) ;; on last try just exit
(begin
(debug:print 0 "ERROR: communication with the server timed out. Giving up.")
(exit 1)))))))
(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)
(let ((match (string-search (regexp "<body>(.*)<.body>") res)))
(debug:print-info 11 "match=" match)
(let ((final (cadr match)))
(debug:print-info 11 "final=" final)
final)))))))
(define (http-transport:client-connect iface port)
(let* ((login-res #f)
(uri-dat (make-request method: 'POST uri: (uri-reference (conc "http://" iface ":" port "/ctrl"))))
(serverdat (list iface port uri-dat)))
(set! login-res (client:login serverdat))
(if (and (not (null? login-res))
(car login-res))
(begin
(debug:print-info 2 "Logged in and connected to " iface ":" port)
(set! *runremote* serverdat)
serverdat)
(begin
(debug:print-info 0 "ERROR: Failed to login or connect to " iface ":" port)
(exit 1)))))
;; (set! *runremote* #f)
;; (set! *transport-type* 'fs)
;; #f))))
;; 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)
;; if none running or if > 20 seconds since
;; server last used then start shutdown
;; This thread waits for the server to come alive
(let* ((server-info (let loop ()
(let ((sdat #f))
(mutex-lock! *heartbeat-mutex*)
(set! sdat *runremote*)
(mutex-unlock! *heartbeat-mutex*)
(if sdat
sdat
(begin
(sleep 4)
(loop))))))
(iface (car server-info))
(port (cadr server-info))
(last-access 0)
(tdb (tasks:open-db))
(spid ;;(open-run-close tasks:server-get-server-id tasks:open-db #f iface port #f))
(tasks:server-get-server-id tdb #f iface port #f))
(server-timeout (let ((tmo (config-lookup *configdat* "server" "timeout")))
(if (and (string? tmo)
(string->number tmo))
(* 60 60 (string->number tmo))
;; default to three days
(* 3 24 60 60)))))
(debug:print-info 2 "server-timeout: " server-timeout ", server pid: " spid " on " iface ":" port)
(let loop ((count 0))
(thread-sleep! 4) ;; no need to do this very often
;; NB// sync currently does NOT return queue-length
(let () ;; (queue-len (cdb:client-call server-info 'sync #t 1)))
;; (print "Server running, count is " count)
(if (< count 1) ;; 3x3 = 9 secs aprox
(loop (+ count 1)))
;; Check that iface and port have not changed (can happen if server port collides)
(mutex-lock! *heartbeat-mutex*)
(set! sdat *runremote*)
(mutex-unlock! *heartbeat-mutex*)
(if (or (not (equal? sdat (list iface port)))
(not spid))
(begin
(debug:print-info 0 "interface changed, refreshing iface and port info")
(set! iface (car sdat))
(set! port (cadr sdat))
(set! spid (tasks:server-get-server-id tdb #f iface port #f))))
;; NOTE: Get rid of this mechanism! It really is not needed...
;; (open-run-close tasks:server-update-heartbeat tasks:open-db spid)
(tasks:server-update-heartbeat tdb spid)
;; (if ;; (or (> numrunning 0) ;; stay alive for two days after last access
(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)
(if (> (+ last-access server-timeout)
(current-seconds))
(begin
(debug:print-info 2 "Server continuing, seconds since last db access: " (- (current-seconds) last-access))
(loop 0))
(begin
(debug:print-info 0 "Starting to shutdown the server.")
;; need to delete only *my* server entry (future use)
(set! *time-to-exit* #t)
(open-run-close tasks:server-deregister-self tasks:open-db (get-host-name))
(thread-sleep! 1)
(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 "
(if (eq? *number-of-writes* 0)
"n/a (no writes)"
(/ *writes-total-delay*
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(thread-start! th3)
(thread-start! th1)
(set! *didsomething* #t)
(thread-join! th2))
(debug:print 0 "ERROR: Failed to setup for megatest")))
(exit)))
(define (http-transport:server-signal-handler signum)
(handle-exceptions
exn
(debug:print " ... exiting ...")
(let ((th1 (make-thread (lambda ()
(thread-sleep! 1))
;; (if (not *received-response*)
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(thread-start! th3)
(thread-start! th1)
(set! *didsomething* #t)
(thread-join! th2))
(debug:print 0 "ERROR: Failed to setup for megatest")))
(exit)))
;; (use trace)
;; (trace http-transport:keep-running
;; tasks:server-update-heartbeat
;; tasks:server-get-server-id)
;; tasks:get-best-server
;; http-transport:run
;; http-transport:launch
;; http-transport:try-start-server
;; http-transport:client-send-receive
;; http-transport:make-server-url
;; tasks:server-register
;; tasks:server-delete
;; start-server
;; hostname->ip
;; with-input-from-request
;; tasks:server-deregister-self)
(define (http-transport:server-signal-handler signum)
(handle-exceptions
exn
(debug:print " ... exiting ...")
(let ((th1 (make-thread (lambda ()
(thread-sleep! 1))
;; (if (not *received-response*)
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