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#lang racket/base
(require racket/contract
(for-syntax racket/base)
racket/runtime-path
net/url
web-server/private/xexpr
web-server/http/xexpr
web-server/http/response-structs
web-server/http/request-structs)
(define (format-stack-trace trace)
`(pre
,@(for/list ([item (in-list trace)])
(format "~a at:\n ~a\n"
(if (car item)
(car item)
"<unknown procedure>")
(if (cdr item)
(format "line ~a, column ~a, in file ~a"
(srcloc-line (cdr item))
(srcloc-column (cdr item))
(srcloc-source (cdr item)))
"<unknown location>")))))
(define-runtime-path default-error-style-sheet
"../default-web-root/htdocs/error.css")
(define (pretty-exception-response url exn)
(response/xexpr
#:code 500
#:message #"Internal Server Error"
`(html
(head
(title "Servlet Error")
(link ([rel "stylesheet"] [href "/error.css"])))
(body
(div ([class "section"])
(div ([class "title"]) "Exception")
(p
"The application raised an exception with the message:"
(pre ,(if (exn:pretty? exn)
(exn:pretty-xexpr exn)
(exn-message exn))))
(p
"Stack trace:"
,(format-stack-trace
(continuation-mark-set->context (exn-continuation-marks exn)))))))))
; file-response : nat str str [(cons sym str) ...] -> response
; The server should still start without the files there, so the
; configuration tool still runs. (Alternatively, find an work around.)
(define (file-response code short text-file . headers)
(response/full code short
(current-seconds) TEXT/HTML-MIME-TYPE
headers
(list (read-file text-file))))
; servlet-loading-responder : url tst -> response
; This is slightly tricky since the (interesting) content comes from the exception.
(define (servlet-loading-responder url exn)
((error-display-handler)
(format "Servlet (@ ~a) didn't load:\n~a\n" (url->string url) (exn-message exn))
exn)
(pretty-exception-response url exn))
; gen-servlet-not-found : str -> url -> response
(define (gen-servlet-not-found file-not-found-file)
(lambda (url)
(file-response 404 #"Servlet not found" file-not-found-file)))
; servlet-error-response : url exn -> response
(define (servlet-error-responder url exn)
((error-display-handler)
(format "Servlet (@ ~a) exception:\n~a\n" (url->string url) (exn-message exn))
exn)
(pretty-exception-response url exn))
; gen-servlet-responder : str -> url tst -> response
(define (gen-servlet-responder servlet-error-file)
(lambda (url exn)
((error-display-handler)
(format "Servlet (@ ~a) exception:\n~e\n" (url->string url) (exn-message exn))
exn)
(file-response 500 #"Servlet error" servlet-error-file)))
; gen-servlets-refreshed : str -> -> response
(define (gen-servlets-refreshed servlet-refresh-file)
(lambda ()
(file-response 200 #"Servlet cache refreshed" servlet-refresh-file)))
; gen-passwords-refreshed : str -> -> response
(define (gen-passwords-refreshed password-refresh-file)
(lambda ()
(file-response 200 #"Passwords refreshed" password-refresh-file)))
; gen-authentication-responder : str -> url (cons sym str) -> response
(define (gen-authentication-responder access-denied-file)
(lambda (uri recommended-header)
(file-response 401 #"Authorization Required" access-denied-file
recommended-header)))
; gen-protocol-responder : str -> str -> response
(define (gen-protocol-responder protocol-file)
(lambda (error-message)
(file-response 400 #"Malformed Request" protocol-file)))
; gen-file-not-found-responder : str -> req -> response
(define (gen-file-not-found-responder file-not-found-file)
(lambda (req)
(file-response 404 #"File not found" file-not-found-file)))
; gen-collect-garbage-responder : str -> -> response
(define (gen-collect-garbage-responder file)
(lambda ()
(file-response 200 #"Garbage collected" file)))
; read-file : str -> str
(define (read-file path)
(call-with-input-file path
(lambda (in) (read-bytes (file-size path) in))))
(provide/contract
[file-response ((natural-number/c bytes? path-string?) () #:rest (listof header?) . ->* . response?)]
[servlet-loading-responder (url? exn? . -> . response?)]
[gen-servlet-not-found (path-string? . -> . (url? . -> . response?))]
[servlet-error-responder (url? exn? . -> . response?)]
[gen-servlet-responder (path-string? . -> . (url? exn? . -> . response?))]
[gen-servlets-refreshed (path-string? . -> . (-> response?))]
[gen-passwords-refreshed (path-string? . -> . (-> response?))]
[gen-authentication-responder (path-string? . -> . (url? header? . -> . response?))]
[gen-protocol-responder (path-string? . -> . (url? . -> . response?))]
[gen-file-not-found-responder (path-string? . -> . (request? . -> . response?))]
[gen-collect-garbage-responder (path-string? . -> . (-> response?))])
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