10 (chicken process-context)
13 (define gopher-index-file-name "index")
16 ;; We don't actually use worker threads here to handle requests,
17 ;; the server just blocks until the first request is finished.
19 (define (make-server-config root-dir host port)
20 (list root-dir host port))
22 (define (server-root-dir config) (list-ref config 0))
23 (define (server-host config) (list-ref config 1))
24 (define (server-port config) (list-ref config 2))
26 (define (run-server config)
27 (print "Gopher server listening on port " (server-port config) " ...")
28 (let ((listener (tcp-listen (server-port config))))
30 (let-values (((in-port out-port) (tcp-accept listener)))
31 (let* ((line (read-line in-port))
32 (selector (string-trim-both line)))
33 (let-values (((local-ip remote-ip) (tcp-addresses in-port)))
34 (print "Accepted connection from " remote-ip
35 " on " (seconds->string)))
38 (with-output-to-port out-port
40 (serve-selector (if (= (string-length selector) 0)
44 (print "... served selector '" selector "'. Closing connection."))
46 (print-error-message o out-port)
47 (print-error-message o)
48 (print "Error while attempting to serve selector " selector "."))))
49 (close-input-port in-port)
50 (close-output-port out-port))
52 (tcp-close listener)))
55 ;;; Selector retrieval
57 (define (directory-selector? selector)
58 (string-suffix? "/" selector))
60 (define (text-selector? selector)
61 (apply or (map (lambda (ext) (string-suffix? ext selector))
62 '(".txt" ".org" ".md"))))
64 (define (serve-selector selector config)
66 ((directory-selector? selector) serve-directory)
67 ((text-selector? seletor) serve-text-file)
68 (else serve-binary-file))
71 (define (serve-directory path config)
72 (let ((file-name (make-pathname (list (server-root-dir config) path)
73 gopher-index-file-name)))
74 (if (regular-file? file-name)
75 (with-input-from-file file-name
77 (let loop ((c (peek-char)))
84 (serve-record (read) path config)
86 (serve-info-record (read-line)))
87 (loop (peek-char)))))))
88 (error "Index file not found."))))
90 (define (serve-text-file path config)
91 (let ((file-name (make-pathname (server-root-dir config) path)))
92 (if (regular-file? file-name)
93 (with-input-from-file file-name
99 (error "File not found." file-name))))
101 (define (serve-binary-file path config)
102 (let ((file-name (make-pathname (server-root-dir config) path)))
103 (if (regular-file? file-name)
104 (with-input-from-file file-name
106 (let loop ((b (read-byte)))
111 (loop (read-byte)))))))
112 (error "File not found." file-name))))
117 (define (serve-info-record info-string)
118 (print "i" info-string "\tfake\tfake\t1\r"))
123 (let ((progname (car (argv)))
125 (if (or (< (length args) 2)
126 (equal? (car args) "-h")
127 (equal? (car args) "--help"))
129 progname " -h/--help\n"
130 progname " gopher-root-dir server-hostname server-port")
131 (let ((root (car args))
132 (hostname (cadr args))
133 (port (if (= (length args) 3) (string->number (caddr args)) 70)))
135 (run-server (make-server-config root hostname port))
136 (error "Invalid port argument." port))))))
141 ;; (run-server (make-server-config "gopher-root" "localhost" 70)))