133 lines
4.5 KiB
Scheme
133 lines
4.5 KiB
Scheme
;;; logging.scm
|
|
;;; logging functionality for web server
|
|
;;; 2002, Andreas Bernauer, Martin Gasbichler
|
|
|
|
;; default: no logging
|
|
;; initialized by init-http-log!
|
|
|
|
;; CLF-logging
|
|
;; if enabled, it will look like this:
|
|
;; (lambda req reply-code)
|
|
(define http-log (lambda a #f)) ; makes logging in CLF
|
|
|
|
;; syslogging
|
|
;; if enabled, it will look like this:
|
|
;; (lambda (level fmt . args)
|
|
(define http-syslog (lambda a #f)) ; makes syslog
|
|
(define *http-syslog?* #f) ; trigger used to avoid
|
|
; unnecessary computations
|
|
(define *http-log-port*)
|
|
(define (http-log-port)
|
|
*http-log-port*)
|
|
(define (set-http-log-port! port)
|
|
(set! *http-log-port* port))
|
|
|
|
(define (init-http-log! options)
|
|
;; syslog has to be initialized befor CLF-logging
|
|
;; because it may generate syslog-messages
|
|
(init-http-syslog! (httpd-options-syslog? options))
|
|
(init-http-port-log! (httpd-options-logfile options)))
|
|
|
|
(define (init-http-port-log! logfile)
|
|
(let ((logport
|
|
(cond
|
|
((string? logfile) ; try to open logfile for appending (output)
|
|
(open-logfile logfile))
|
|
((output-port? logfile) ; we were given an output port, so let's use it
|
|
logfile)
|
|
((eq? logfile #f) ; no logging demanded
|
|
#f)
|
|
; unexpected value of logfile;
|
|
(else
|
|
(http-syslog
|
|
(syslog-level warning)
|
|
"[httpd] Warning: Logfile was not specified correctly (given: ~S).~% No CLF logging."
|
|
logfile)
|
|
(make-null-output-port)))))
|
|
|
|
(if logfile ; if logging was specified, set up the logger
|
|
(let ((http-log-lock (make-lock)))
|
|
(set-http-log-port! logport)
|
|
(if (string? logfile)
|
|
(spawn (make-logfile-rotator logfile http-log-lock)))
|
|
(set! http-log (make-http-log-proc http-log-lock))))))
|
|
; alternative-clause: default values of *http-syslog?* and http-log
|
|
|
|
(define (init-http-syslog! syslog?)
|
|
(if syslog?
|
|
(let ((http-syslog-lock (make-lock)))
|
|
(set! *http-syslog?* #t)
|
|
(set! http-syslog
|
|
(lambda (level fmt . args)
|
|
(obtain-lock http-syslog-lock)
|
|
(syslog level
|
|
(apply format #f fmt args))
|
|
(release-lock http-syslog-lock))))))
|
|
|
|
(define (make-http-log-proc http-log-lock)
|
|
; (display "--- MARK (server started) ---\n" http-log-port)
|
|
(lambda (req reply-code)
|
|
(if req
|
|
(begin
|
|
(obtain-lock http-log-lock)
|
|
(display (make-CLF
|
|
(receive (host-address _)
|
|
(socket-address->internet-address
|
|
(socket-remote-address (request:socket req)))
|
|
(format-internet-host-address host-address))
|
|
(request:method req) ; request method
|
|
(uri-path-list->path
|
|
(http-url:path (request:url req))) ; requested file
|
|
(version->string (request:version req)) ; protocol version
|
|
reply-code
|
|
23 ; filesize (unknown)
|
|
(get-header (request:headers req) 'referer)
|
|
(get-header (request:headers req) 'user-agent))
|
|
(http-log-port))
|
|
(force-output (http-log-port))
|
|
(release-lock http-log-lock)))))
|
|
|
|
|
|
;; does the logfile rotation on signal USR1
|
|
(define (make-logfile-rotator logfile http-log-lock)
|
|
(set-interrupt-handler interrupt/usr1 #f)
|
|
(lambda ()
|
|
(on-interrupt
|
|
interrupt/usr1
|
|
(lambda ()
|
|
(obtain-lock http-log-lock)
|
|
(close-output-port (http-log-port))
|
|
(set-http-log-port! (open-logfile logfile))
|
|
(release-lock http-log-lock)))))
|
|
|
|
(define (open-logfile logfile)
|
|
(with-errno-handler*
|
|
(lambda (errno packet)
|
|
(http-syslog (syslog-level warning)
|
|
"[httpd] Warning: An error occured while opening ~S for writing (~A).~%Send signal USR1 when the problem is fixed.~%"
|
|
logfile
|
|
(car packet))
|
|
(make-null-output-port))
|
|
(lambda ()
|
|
(open-output-file logfile
|
|
(bitwise-ior open/create open/append)))))
|
|
|
|
; returns a string for a CLF entry (Common Log Format)
|
|
; note: till now, we do not log the user's time zone code
|
|
(define (make-CLF remote-ip request-type requested-file protocol http-code filesize referer user-agent)
|
|
(format #f "~A - - ~A ~S ~A ~A ~S ~S~%"
|
|
(or remote-ip "-")
|
|
(format-date "[~d/~b/~Y:~H:~M:~S +0000]" (date)) ; +0000 as we don't know
|
|
(string-join (list request-type requested-file protocol))
|
|
; Unfortunately, we first split the request line into
|
|
; method/request-type etc. and put it together here.
|
|
; Files conform to CLF are expected to print the original line.
|
|
(or http-code "-")
|
|
(or filesize "-")
|
|
(if (string? referer) (string-trim referer) "")
|
|
(if (string? user-agent)
|
|
(string-trim user-agent char-set:whitespace)
|
|
"")))
|
|
|
|
|