(chicken process-context)
srfi-1 srfi-13 matchable)
+;;; Global constants
+
(define gopher-index-file-name "index")
(define burrow-version "1.0.0")
"Served by Burrow Gopher Server v" burrow-version "\n"
"Powered by Chicken Scheme!"))
+
;;; Server loop
-;; We don't actually use worker threads here to handle requests,
+
+;; We don't yet use worker threads here to handle requests,
;; the server just blocks until the first request is finished.
+;; While we should fix this, it's actually probably okay, as
+;; we genuinely don't expect a huge flood of gopher traffic. :-(
(define-record config root-dir host port display-footer)
(selector (string-trim-both line)))
(let-values (((local-ip remote-ip) (tcp-addresses in-port)))
(print "Accepted connection from " remote-ip
- " on " (seconds->string)))
- (condition-case
- (begin
- (with-output-to-port out-port
- (lambda ()
- (serve-selector (if (= (string-length selector) 0)
- "/"
- selector)
- config)))
- (print "... served selector '" selector "'. Closing connection."))
- (o (exn)
- (print-error-message o out-port)
- (print-error-message o)
- (print "Error while attempting to serve selector " selector "."))))
+ " on " (seconds->string))
+ (condition-case
+ (begin
+ (with-output-to-port out-port
+ (lambda ()
+ (serve-selector (if (= (string-length selector) 0)
+ "/"
+ selector)
+ remote-ip config)))
+ (print "... served selector '" selector "'. Closing connection."))
+ (o (exn)
+ (print-error-message o out-port)
+ (print-error-message o)
+ (print "Error while attempting to serve selector " selector ".")))))
(close-input-port in-port)
(close-output-port out-port))
(server-loop))
(tcp-close listener)))
+
;;; Selector type inference
(define (has-suffix? selector . suffixes)
((or (= (string-length l) 0) (string-suffix? "/" l)) 1)
((has-suffix? l ".txt" ".org" ".md") 0)
((has-suffix? l ".png" ".jpg" ".gif" ".bmp" ".tif" ".tga") 'I)
+ ((has-suffix? l "?") 7)
(else 9))))
+
;;; Selector retrieval
-(define (serve-selector selector config)
- ((case (infer-selector-type selector)
- ((1) serve-directory)
- ((0) serve-text-file)
- (else serve-binary-file))
- selector config))
+(define (serve-selector raw-selector remote-ip config)
+ (let* ((selector-list (string-split raw-selector "\t"))
+ (selector (car selector-list))
+ (arguments (cdr selector-list)))
+ (case (infer-selector-type selector)
+ ((1) (serve-directory selector config))
+ ((0) (serve-text-file selector config))
+ ((7) (serve-query selector arguments remote-ip config))
+ (else (serve-binary-file selector config)))))
-(define (serve-directory path config)
- (let ((file-name (make-pathname (list (config-root-dir config) path)
+(define (serve-directory selector config)
+ (let ((file-name (make-pathname (list (config-root-dir config) selector)
gopher-index-file-name)))
(if (regular-file? file-name)
(begin
(if (eq? c #\,)
(begin
(read-char)
- (serve-record (read) path config)
+ (serve-record (read) selector config)
(read-line))
(serve-info-records (read-line)))
(loop (peek-char)))))))
(serve-info-records burrow-footer)))
(error "Index file not found."))))
-(define (serve-text-file path config)
- (let ((file-name (make-pathname (config-root-dir config) path)))
+(define (serve-text-file selector config)
+ (let ((file-name (make-pathname (config-root-dir config) selector)))
(if (regular-file? file-name)
(with-input-from-file file-name
(lambda ()
(read-lines))))
(error "File not found." file-name))))
-(define (serve-binary-file path config)
- (let ((file-name (make-pathname (config-root-dir config) path)))
+(define (serve-binary-file selector config)
+ (let ((file-name (make-pathname (config-root-dir config) selector)))
(if (regular-file? file-name)
(with-input-from-file file-name
(lambda ()
(loop (read-byte)))))))
(error "File not found." file-name))))
+(define (serve-query selector arguments remote-ip config)
+ (let ((file-name (make-pathname (config-root-dir config)
+ (conc (string-chomp selector "?") ".scm"))))
+ (if (and (regular-file? file-name)
+ (= (length arguments) 1))
+ (with-input-from-file file-name
+ (lambda ()
+ (serve-info-records
+ (with-selector-dir
+ selector config
+ (lambda ()
+ (apply (eval (read))
+ (list (car arguments) remote-ip)))))))
+ (error "Invalid query."))))
+
;;; Index rendering
(print "\tfake\tfake\t1\r"))
(string-split string "\n" #t)))
-(define (serve-record record path config)
+(define (serve-record record dir-selector config)
(match record
- (('shell command) (serve-shell-command command))
- (('eval expression) (serve-expression expression))
+ (('shell command) (serve-shell-command command dir-selector config))
+ (('eval expression) (serve-expression expression dir-selector config))
+ (('url display-string url)
+ (print #\h display-string "\tURL:" url "\tfake\t80\r"))
((type display-string selector host port)
(print type display-string "\t" selector "\t" host "\t" port "\r"))
((type display-string selector host)
(serve-record (list type display-string selector host 70)
- path config))
+ dir-selector config))
((type display-string selector)
- (serve-record (list type display-string selector
+ (serve-record (list type display-string
+ (make-pathname dir-selector selector)
(config-host config) (config-port config))
- path config))
+ dir-selector config))
((display-string selector)
(serve-record (list (infer-selector-type selector) display-string selector)
- path config))
+ dir-selector config))
((selector)
(serve-record (list (infer-selecto-type selector) selector)
- path config))
+ dir-selector config))
(else (error "Unknown record type."))))
-(define (serve-shell-command command)
- (let-values (((in-port out-port id) (process command)))
- (serve-info-records (string-chomp (read-string #f in-port) "\n"))))
+(define (serve-shell-command command dir-selector config)
+ (with-selector-dir
+ dir-selector config
+ (lambda ()
+ (let-values (((in-port out-port id) (process command)))
+ (serve-info-records (string-chomp (read-string #f in-port) "\n"))))))
+
+(define (serve-expression expression dir-selector config)
+ (with-selector-dir
+ dir-selector config
+ (lambda ()
+ (serve-info-records (conc (eval expression))))))
+
+
+;;; Utility methods
+
+(define (with-current-working-directory directory thunk)
+ (let ((old-wd (current-directory))
+ (result 'none))
+ (change-directory directory)
+ (set! result (thunk))
+ (change-directory old-wd)
+ result))
-(define (serve-expression expression)
- (serve-info-records (conc (eval expression))))
+(define (with-selector-dir selector config thunk)
+ (with-current-working-directory
+ (make-pathname (config-root-dir config)
+ (pathname-directory selector)) thunk))
;;; main
(begin
(config-display-footer-set! config #f)
(set! args (cdr args))))
- (print args)
(if (or (< (length args) 2)
(> (length args) 3))
(print-usage progname)
The Lambda Lab / projects / scratchy.git / blobdiff