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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)
(use spiffy uri-common intarweb http-client spiffy-request-vars uri-common intarweb spiffy-directory-listing)
;; 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 *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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(string->number (config-lookup *configdat* "server" "port"))
(+ 5000 (random 1001)))))
(link-tree-path (config-lookup *configdat* "setup" "linktree")))
(set! *cache-on* #t)
(root-path (if link-tree-path
link-tree-path
(current-directory))) ;; WARNING: SECURITY HOLE. FIX ASAP!
(handle-directory spiffy-directory-listing)
;; http-transport:handle-directory) ;; simple-directory-handler)
;; Setup the web server and a /ctrl interface
;;
(vhost-map `(((* any) . ,(lambda (continue)
;; open the db on the first call
(if (not db)(set! db (open-db)))
(let* (($ (request-vars source: 'both))
(dat ($ 'dat))
(res #f))
(cond
((equal? (uri-path (request-uri (current-request)))
'(/ "hey"))
(send-response body: "hey there!\n"
headers: '((content-type text/plain))))
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(set! res (db:process-queue-item db packet))
;; (mutex-unlock! *db:process-queue-mutex*)
(debug:print-info 11 "Return value from db:process-queue-item is " res)
(send-response body: (conc "<head>ctrl data</head>\n<body>"
res
"</body>")
headers: '((content-type text/plain)))))
((equal? (uri-path (request-uri (current-request)))
'(/ ""))
(send-response body: (http-transport:main-page)))
((equal? (uri-path (request-uri (current-request)))
'(/ "runs"))
(send-response body: (http-transport:main-page)))
((equal? (uri-path (request-uri (current-request)))
'(/ any))
(send-response body: "hey there!\n"
headers: '((content-type text/plain))))
((equal? (uri-path (request-uri (current-request)))
'(/ "hey"))
(send-response body: "hey there!\n"
headers: '((content-type text/plain))))
(else (continue))))))))
(http-transport:try-start-server ipaddrstr start-port)))
;; This is recursively run by http-transport:run until sucessful
;;
(define (http-transport:try-start-server ipaddrstr portnum)
(handle-exceptions
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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)
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)
(print "INFO: server has been stopped")))
(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)
(let* ((url (http-transport:make-server-url serverdat))
(fullurl (conc url "/ctrl")) ;; (conc url "/?dat=" msg)))
(numretries 0))
(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 200)
(http-transport:client-send-receive serverdat msg))
(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 100)
(max-retry-attempts 5)
;; consider all requests indempotent
(retry-request? (lambda (request)
(thread-sleep! (/ (if (> numretries 100) 100 numretries) 10))
(set! numretries (+ numretries 1))
#t))
#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*)
(let* ((res (with-input-from-request fullurl
;; #f
;; msg
(list (cons 'dat msg))
read-string)))
(serverdat (list iface port)))
(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 "Failed to login or connect to " iface ":" port)
(set! *runremote* #f)
(set! *transport-type* 'fs)
#f))))
(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
(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 (and *server-run*
(if (> (+ last-access server-timeout)
(current-seconds))
(debug:print-info 2 "Server continuing, seconds since last db access: " (- (current-seconds) last-access))
(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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(thread-sleep! 3) ;; give the flush three seconds to do it's stuff
(debug:print 0 " Done.")
(exit 4))
"exit on ^C timer")))
(thread-start! th2)
(thread-start! th1)
(thread-join! th2))))
;;======================================================================
;; web pages
;;======================================================================
(define (http-transport:main-page)
(let ((linkpath (root-path)))
(conc "<head><h1>" (pathname-strip-directory *toppath*) "</h1></head>"
"<body>"
"Run area: " *toppath*
"<h2>Server Stats</h2>"
(http-transport:stats-table)
"<hr>"
(http-transport:runs linkpath)
"<hr>"
(http-transport:run-stats)
"</body>"
)))
(define (http-transport:stats-table)
(mutex-lock! *heartbeat-mutex*)
(let ((res
(conc "<table>"
"<tr><td>Max cached queries</td> <td>" *max-cache-size* "</td></tr>"
"<tr><td>Number of cached writes</td> <td>" *number-of-writes* "</td></tr>"
"<tr><td>Average cached write time</td> <td>" (if (eq? *number-of-writes* 0)
"n/a (no writes)"
(/ *writes-total-delay*
*number-of-writes*))
" ms</td></tr>"
"<tr><td>Number non-cached queries</td> <td>" *number-non-write-queries* "</td></tr>"
"<tr><td>Average non-cached time</td> <td>" (if (eq? *number-non-write-queries* 0)
"n/a (no queries)"
(/ *total-non-write-delay*
*number-non-write-queries*))
" ms</td></tr>"
"<tr><td>Last access</td><td>" (seconds->time-string *last-db-access*) "</td></tr>"
"</table>")))
(mutex-unlock! *heartbeat-mutex*)
res))
(define (http-transport:runs linkpath)
(conc "<h3>Runs</h3>"
(string-intersperse
(let ((files (map pathname-strip-directory (glob (conc linkpath "/*")))))
(map (lambda (p)
(conc "<a href=\"" p "\">" p "</a><br>"))
files))
" ")))
(define (http-transport:run-stats)
(let ((stats (open-run-close db:get-running-stats #f)))
(conc "<table>"
(string-intersperse
(map (lambda (stat)
(conc "<tr><td>" (car stat) "</td><td>" (cadr stat) "</td></tr>"))
stats)
" ")
"</table>")))
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