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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))
(declare (uses daemon))
(include "common_records.scm")
(include "db_records.scm")
(define (http-transport:make-server-url hostport)
(if (not hostport)
#f
(conc "http://" (car hostport) ":" (cadr hostport))))
(define *server-loop-heart-beat* (current-seconds))
(define *heartbeat-mutex* (make-mutex))
;;======================================================================
;; S E R V E R
;;======================================================================
;; Call this to start the actual server
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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
(conc "http://" (car hostport) ":" (cadr hostport))))
(define *server-loop-heart-beat* (current-seconds))
(define *heartbeat-mutex* (make-mutex))
;;======================================================================
;; S E R V E R
;;======================================================================
;; Call this to start the actual server
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(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
;; 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)
(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 0 "Logged in and connected to " iface ":" port)
(set! *runremote* serverdat)
serverdat)
(begin
(debug:print-info 0 "Failed to login or connect to " iface ":" port)
(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))
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(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))
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(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))
(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)
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(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 (and *server-run*
(> (+ last-access server-timeout)
(current-seconds)))
(begin
(debug:print-info 0 "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)
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