;; Copyright 2006-2012, Matthew Welland.
;;
;; This program is made available under the GNU GPL version 2.0 or
;; greater. See the accompanying file COPYING for details.
;;
;; This program is distributed WITHOUT ANY WARRANTY; without even the
;; implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
;; 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 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 *heartbeat-mutex* (make-mutex))
;;======================================================================
;; S E R V E R
;;======================================================================
;; 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 run-id server-id)
(debug:print 2 "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 (open-run-close tasks:server-get-next-port tasks:open-db))
(link-tree-path (configf:lookup *configdat* "setup" "linktree")))
(set! db *inmemdb*)
(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
;; This is were we set up the database connections
(let* (($ (request-vars source: 'both))
(dat ($ 'dat))
(res #f))
(cond
((equal? (uri-path (request-uri (current-request)))
'(/ "api"))
(send-response body: (api:process-request db $) ;; the $ is the request vars proc
headers: '((content-type text/plain)))
(mutex-lock! *heartbeat-mutex*)
(set! *last-db-access* (current-seconds))
(mutex-unlock! *heartbeat-mutex*))
;; This is the /ctrl path where data is handed to the server and
;; responses
;; ((equal? (uri-path (request-uri (current-request)))
;; '(/ "ctrl"))
;; (let* ((packet (db:string->obj dat))
;; (qtype (cdb:packet-get-qtype packet)))
;; (debug:print-info 12 "server=> received packet=" packet)
;; (if (not (member qtype '(sync ping)))
;; (begin
;; (mutex-lock! *heartbeat-mutex*)
;; (set! *last-db-access* (current-seconds))
;; (mutex-unlock! *heartbeat-mutex*)))
;; ;; (mutex-lock! *db:process-queue-mutex*) ;; trying a mutex
;; ;; (set! res (open-run-close db:process-queue-item open-db packet))
;; (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 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)
(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)
;; get_next_port goes here
(http-transport:try-start-server run-id ipaddrstr (+ portnum 1) server-id))
(begin
(open-run-close tasks:server-force-clean-run-record tasks:open-db 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))
(open-run-close tasks:server-set-interface-port
tasks:open-db
server-id
ipaddrstr portnum)
(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)
(start-server port: portnum)
(open-run-close tasks:server-force-clean-run-record tasks:open-db run-id ipaddrstr portnum " http-transport:try-start-server")
(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))
;; NOTE: Large block of code from 32436b426188080f72fceb6894af541fbad9921e removed here
;; I'm pretty sure it is defunct.
;; This next block all imported en-mass from the api branch
(define *http-requests-in-progress* 0)
(define *http-connections-next-cleanup* (current-seconds))
(define (http-transport:get-time-to-cleanup)
(let ((res #f))
(mutex-lock! *http-mutex*)
(set! res (> (current-seconds) *http-connections-next-cleanup*))
(mutex-unlock! *http-mutex*)
res))
(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...")
(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"))
(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")
(exit 1))))
(res #f))
(handle-exceptions
exn
(if (> numretries 0)
(begin
(mutex-unlock! *http-mutex*)
(thread-sleep! 1)
(close-all-connections!)
(debug:print 0 "WARNING: Failed to communicate with server, trying again, numretries left: " numretries)
(http-transport:client-api-send-receive run-id serverdat cmd params numretries: (- numretries 1)))
(begin
(mutex-unlock! *http-mutex*)
#f))
(begin
(debug:print-info 11 "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*)
(set! res (with-input-from-request ;; was dat
fullurl
(list (cons 'key "thekey")
(cons 'cmd cmd)
(cons 'params params))
read-string))
;; Shouldn't this be a call to the managed call-all-connections stuff above?
(close-all-connections!)
(mutex-unlock! *http-mutex*)
))
(time-out (lambda ()
(thread-sleep! 45)
#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)
res)))))
;; careful closing of connections stored in *runremote*
;;
(define (http-transport:close-connections run-id)
(let* ((server-dat (hash-table-ref/default *runremote* run-id #f)))
(if (vector? server-dat)
(let ((api-dat (http-transport:server-dat-get-api-uri server-dat)))
(close-connection! api-dat)
#t)
#f)))
(define (make-http-transport:server-dat)(make-vector 5))
(define (http-transport:server-dat-get-iface vec) (vector-ref vec 0))
(define (http-transport:server-dat-get-port vec) (vector-ref vec 1))
(define (http-transport:server-dat-get-api-uri vec) (vector-ref vec 2))
(define (http-transport:server-dat-get-api-url vec) (vector-ref vec 3))
(define (http-transport:server-dat-get-api-req vec) (vector-ref vec 4))
;;
;; 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)))
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)
;; 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 ((start-time (current-seconds))
(changed #t)
(last-sdat "not this"))
(let ((sdat #f))
(mutex-lock! *heartbeat-mutex*)
(set! sdat *server-info*)
(mutex-unlock! *heartbeat-mutex*)
(if (and sdat
(not changed)
(> (- (current-seconds) start-time) 2))
sdat
(begin
(sleep 4)
(loop start-time
(equal? sdat last-sdat)
sdat))))))
(iface (car server-info))
(port (cadr server-info))
(last-access 0)
(tdb (tasks:open-db))
(server-timeout (let ((tmo (configf:lookup *configdat* "server" "timeout")))
(if (and (string? tmo)
(string->number tmo))
(* 60 60 (string->number tmo))
;; (* 3 24 60 60) ;; default to three days
;; (* 60 1) ;; default to one minute
(* 60 60 25) ;; default to 25 hours
))))
(let loop ((count 0)
(server-state 'available))
;; Use this opportunity to sync the inmemdb to db
(let ((start-time (current-milliseconds))
(sync-time #f)
(rem-time #f))
(if *inmemdb* (db:sync-touched *inmemdb* force-sync: #t))
(set! sync-time (- (current-milliseconds) start-time))
(set! rem-time (quotient (- 4000 sync-time) 1000))
(debug:print 0 "SYNC: time= " sync-time ", rem-time=" rem-time)
;;
;; set_running after our first pass through
;;
(if (eq? server-state 'available)
(tasks:server-set-state! tdb server-id "running"))
(if (and (<= rem-time 4)
(> rem-time 0))
(thread-sleep! rem-time)
(thread-sleep! 4))) ;; fallback for if the math is changed ...
(if (< count 1) ;; 3x3 = 9 secs aprox
(loop (+ count 1) 'running))
;; Check that iface and port have not changed (can happen if server port collides)
(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")
(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)
;;
;; no_traffic
;;
(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))
;;
;; 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))
(begin
(debug:print-info 0 "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* force-sync: #t))
;;
;; start_shutdown
;;
( tasks:server-set-state! tdb server-id "shutting-down")
(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 "
(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 "
(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")
(tasks:server-delete-record tdb server-id " http-transport:keep-running")
(exit))))))
;; all routes though here end in exit ...
;;
;; start_server?
;;
(define (http-transport:launch run-id)
(set! *run-id* run-id)
(if (args:get-arg "-daemonize")
(daemon:ize))
(if (server:check-if-running run-id)
(begin
(debug:print 0 "INFO: Server for run-id " run-id " already running")
(exit 0)))
(let loop ((server-id (open-run-close tasks:server-lock-slot tasks:open-db run-id))
(remtries 4))
(if (not server-id)
(if (> remtries 0)
(begin
(thread-sleep! 2)
(loop (open-run-close tasks:server-lock-slot tasks:open-db 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")
(open-run-close tasks:server-delete-records-for-this-pid tasks:open-db " http-transport:launch")
))
(let* ((th2 (make-thread (lambda ()
(http-transport:run
(if (args:get-arg "-server")
(args:get-arg "-server")
"-")
run-id
server-id)) "Server run"))
(th3 (make-thread (lambda ()
(http-transport:keep-running server-id))
"Keep running")))
;; Database connection
(set! *inmemdb* (db:setup run-id))
(thread-start! th2)
(thread-start! th3)
(set! *didsomething* #t)
(thread-join! th2)
(exit)))))
(define (http-transport:server-signal-handler signum)
(handle-exceptions
exn
(debug:print " ... 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.")
(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>")))