;; 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 srfi-1 posix regex regex-case srfi-69 hostinfo md5 message-digest) ;; sqlite3
;; (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))
(declare (uses portlogger))
(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 (http-transport:run hostn run-id server-id)
(debug:print 2 *default-log-port* "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 *default-log-port* "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
'server
'message "server error")))))
;; 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 *inmemdb* $) ;; 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*))
((equal? (uri-path (request-uri (current-request)))
'(/ ""))
(send-response body: (http-transport:main-page)))
((equal? (uri-path (request-uri (current-request)))
'(/ "json_api"))
(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)
(let ((config-hostname (configf:lookup *configdat* "server" "hostname"))
(tdbdat (tasks:open-db)))
(debug:print-info 0 *default-log-port* "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 *default-log-port* "WARNING: attempt to start server failed. Trying again ...")
(debug:print 0 *default-log-port* " message: " ((condition-property-accessor 'exn 'message) exn))
(debug:print 0 *default-log-port* "exn=" (condition->list exn))
(portlogger:open-run-close portlogger:set-failed portnum)
(debug:print 0 *default-log-port* "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 *default-log-port* "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 *default-log-port* "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 *default-log-port* "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-error 0 *default-log-port* "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 *default-log-port* "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 *default-log-port* "WARNING: closing connections failed. Server at " fullurl " almost certainly dead")
;; (close-all-connections!))
;; (debug:print 0 *default-log-port* "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 *default-log-port* "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 *default-log-port* "WARNING: failure in with-input-from-request to " fullurl ".")
(debug:print 0 *default-log-port* " 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"
(db:obj->string #f))
(with-input-from-request ;; was dat
fullurl
(list (cons 'key "thekey")
(cons 'cmd cmd)
(cons 'params sparams))
read-string))
transport: 'http)))
;; 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 *default-log-port* "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-error 0 *default-log-port* "error occured at server, info=" (vector-ref res 2))
(debug:print 0 *default-log-port* " client call chain:")
(print-call-chain (current-error-port))
(debug:print 0 *default-log-port* " 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")))))))
;; 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 6))
(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))
(define (http-transport:server-dat-get-last-access vec) (vector-ref vec 5))
(define (http-transport:server-dat-get-socket vec) (vector-ref vec 6))
(define (http-transport:server-dat-make-url vec)
(if (and (http-transport:server-dat-get-iface vec)
(http-transport:server-dat-get-port vec))
(conc "http://"
(http-transport:server-dat-get-iface vec)
":"
(http-transport:server-dat-get-port vec))
#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-error 0 *default-log-port* "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 *default-log-port* "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 *default-log-port* "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 *default-log-port* "Still waiting, last-sdat=" last-sdat)
(sleep 4)
(if (> (- (current-seconds) start-time) 120) ;; been waiting for two minutes
(begin
(debug:print-error 0 *default-log-port* "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))
(last-access 0)
(server-timeout (server:get-timeout)))
(let loop ((count 0)
(server-state 'available)
(bad-sync-count 0))
;; Use this opportunity to sync the inmemdb to db
(if *inmemdb*
(let ((start-time (current-milliseconds))
(sync-time #f)
(rem-time #f))
;; inmemdb is a dbstruct
(condition-case
(db:sync-touched *inmemdb* *run-id* force-sync: #t)
((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-error 0 *default-log-port* "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 *default-log-port* "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 ...
;;
;; no *inmemdb* yet, set running after our first pass through and start the db
;;
(if (eq? server-state 'available)
(let ((new-server-id (tasks:server-am-i-the-server? (db:delay-if-busy tdbdat) run-id))) ;; try to ensure no double registering of servers
(if (equal? new-server-id server-id)
(begin
(tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "dbprep")
(thread-sleep! 0.5) ;; give some margin for queries to complete before switching from file based access to server based access
(set! *inmemdb* (db:setup run-id))
;; force initialization
;; (db:get-db *inmemdb* #t)
(db:get-db *inmemdb* run-id)
(tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "running"))
(begin ;; gotta exit nicely
(tasks:server-set-state! (db:delay-if-busy tdbdat) server-id "collision")
(http-transport:server-shutdown server-id port))))))
(if (< count 1) ;; 3x3 = 9 secs aprox
(loop (+ count 1) 'running bad-sync-count))
;; 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 *default-log-port* "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 *default-log-port* "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 *default-log-port* "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 *default-log-port* "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 *default-log-port* "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 *default-log-port* "Max cached queries was " *max-cache-size*)
(debug:print-info 0 *default-log-port* "Number of cached writes " *number-of-writes*)
(debug:print-info 0 *default-log-port* "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 *default-log-port* "Number non-cached queries " *number-non-write-queries*)
(debug:print-info 0 *default-log-port* "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 *default-log-port* "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 *default-log-port* "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 *default-log-port* "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 *default-log-port* "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 *default-log-port* "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)
(exit))))))
(define (http:ping run-id host-port)
(let* ((server-dat (http-transport:client-connect (car host-port)(cadr host-port)))
(login-res (rmt:login-no-auto-client-setup server-dat run-id)))
(if (and (list? login-res)
(car login-res))
(begin
(print "LOGIN_OK")
(exit 0))
(begin
(print "LOGIN_FAILED")
(exit 1)))))
(define (http-transport:server-signal-handler signum)
(signal-mask! signum)
(handle-exceptions
exn
(debug:print 0 *default-log-port* " ... exiting ...")
(let ((th1 (make-thread (lambda ()
(thread-sleep! 1))
"eat response"))
(th2 (make-thread (lambda ()
(debug:print-error 0 *default-log-port* "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 *default-log-port* " 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>")))