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