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chickadee.scm
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;; chickadee chicken-doc server
;; Copyright (c) 2010 Jim Ursetto. All Rights Reserved.
;; License: BSD.
(module chickadee
(chickadee-start-server
cdoc-uri
chickadee-uri
incremental-search-uri
chickadee-css-files
chickadee-early-js-files
chickadee-js-files
maximum-match-results
maximum-match-signatures
incremental-search
incremental-search-delay
cache-nodes-for
cache-static-content-for
last-modified
ajax-log
%chickadee:debug-incremental-search-latency
)
(import scheme)
(cond-expand
(chicken-4
(import chicken)
(import tcp data-structures srfi-1)
(use spiffy-request-vars chicken-doc)
(use spiffy)
(use matchable)
(use (only uri-generic uri-encode-string))
(use uri-common)
(use intarweb)
;(load "chicken-doc-html.scm")
(use chicken-doc-html)
(use (only chicken-doc-admin man-filename->path))
(use regex) (import irregex)
(use (only srfi-13 string-index string-concatenate))
(use (only posix seconds->string seconds->utc-time utc-time->seconds))
(use srfi-18)
(use (only sxml-transforms
pre-post-order* universal-conversion-rules* SRV:send-reply))
(use (only ports with-output-to-port with-output-to-string))
)
(else
(import (chicken base)
(chicken condition)
(chicken irregex)
(chicken port)
(chicken string)
(chicken time)
(chicken time posix)
(chicken tcp)
chicken-doc
chicken-doc-html
(only chicken-doc-admin man-filename->path)
intarweb
matchable
regex ;; FIXME remove -- replace string-substitute
spiffy
spiffy-request-vars
srfi-1
(only srfi-13 string-index string-concatenate)
srfi-18
sxml-transforms
uri-common
(only uri-generic uri-encode-string)
)
))
;;; HTML
(define (sxml->html doc #!optional port)
(let* ((rules `((lit *preorder* . ,(lambda (t b) b))
. ,universal-conversion-rules*))
(reply (lambda () (SRV:send-reply (pre-post-order* doc rules)))))
(if port
(with-output-to-port port reply)
(with-output-to-string reply))))
(define (maybe pred x)
(if pred x '()))
(define (charset c)
(maybe c
`(meta (@ (http-equiv "content-type")
(content "text/html; charset=" ,c)))))
(define (javascript u)
(if (uri-reference? u)
`(script (@ (type "text/javascript")
(src ,(uri->string (relative-uri u)))))
`(script (@ (type "text/javascript"))
(lit ,u))))
(define (css-link u)
`(link (@ (rel stylesheet)
(href ,(uri->string (relative-uri u)))
(type "text/css"))))
;;; Pages
(define (->json x) ;; q&d JSON generator since we don't need a parser.
(define (quoted-string x)
`("\"" ,(string-substitute (irregex '(: #\")) "\\\"" x)
"\""))
(define (alist->json a)
(map (lambda (e) (list (quoted-string (symbol->string (car e)))
":" (to-json (cdr e))))
a))
(define (to-json x)
(cond ((number? x) (number->string x))
((pair? x) (list "{" (intersperse (alist->json x) ",") "}"))
((string? x) (quoted-string x))
((symbol? x) (quoted-string x))
((vector? x) (list "[" (intersperse (map ->json (vector->list x)) ",") "]"))
(else (error 'json "conversion unsupported" x))))
(tree->string (to-json x)))
(define (search-form)
`(form (@ (class "lookup")
(action ,(uri->string (relative-uri (uri-reference (cdoc-page-path)))))
(method get))
(input (@ (id "searchbox")
(class "text incsearch")
(data-opts ,(->json
`((url . ,(uri->string (relative-uri (incremental-search-uri))))
(delay . ,(incremental-search-delay)))))
(type text)
(name q)
(autocomplete off) ;; apparently readonly in DOM
(autocorrect off)
(autocapitalize off)) ;; iphone/ipad
)
(div (@ (class "buttons"))
(input (@ (class "button") (type submit)
(id "query-name") (name "query-name")
(value "Look up")))
(input (@ (class "button") (type submit)
(id "query-regex") (name "query-regex")
(value "Regexp"))))))
(define (format-id x)
(match (match-nodes x (maximum-match-results))
((n1)
(redirect-to (path->href (node-path n1))))
(()
;; Should we return 404 here? This is not a real resource
(node-page '()
'()
`(p "No node found matching identifier " (tt ,x))
page-title: "node not found"))
(nodes
(match-page nodes x))))
(define (format-re x)
(match-page (match-nodes (irregex x) (maximum-match-results))
x))
(define (format-path-re x)
(match-page (match-node-paths/re (irregex x) (maximum-match-results))
x))
(define (match-page nodes match-text)
(let ((max-results (maximum-match-results))
(result-length (length nodes)))
(cache-for
(cache-nodes-for) ;?
(lambda ()
(last-modified-at
(max (repository-modification-time (current-repository))
(last-modified))
(lambda ()
(node-page
`("query " ,match-text " ("
;; Exceeding match-results can't happen because we cap the
;; result length now, but we keep the logic in place anyway
,(maybe (> result-length max-results)
`(,max-results " of "))
,result-length " matches)")
'() ;contents
(if (= result-length 0)
'()
`(table
(@ (class "match-results"))
(tr (th "path") (th "signature"))
,(let loop ((sigs (maximum-match-signatures))
(results max-results)
(nodes nodes) (acc '()))
(if (or (null? nodes)
(<= results 0))
(reverse acc)
(let ((n (car nodes)))
(loop (- sigs 1) (- results 1)
(cdr nodes)
(cons
`(tr
(td (@ (class "match-path"))
,(title-path n))
(td (@ (class "match-sig"))
,(path-link
(node-path n)
(if (<= sigs 0)
"-"
`(tt ,(node-signature n))))))
acc)))))))
page-title: "query results")))))))
(define (contents-list n)
(let ((ids (node-child-ids n)))
(if (null? ids)
'()
`((h2 (@ (class "contents-list"))
"Contents " (& "raquo"))
(ul (@ (class "contents-list"))
,(map
(let ((child->href (make-child->href n)))
(lambda (id)
`(li
(a (@ (href ,(child->href id))) ,id))))
(map ->string ids)))))))
(define (format-path p)
(let ((n (handle-exceptions e #f (lookup-node (string-split p)))))
(if n
(cache-for ;; NB We send cache-control even with 304s.
(cache-nodes-for)
(lambda ()
(last-modified-at
;; Node modification time may also be more fine-grained,
;; but some generated HTML may depend on the entire repository
;; anyway--and we usually update the whole repo at once.
(max (repository-modification-time (current-repository))
(last-modified))
(lambda ()
(if (null? (node-path n))
(node-page '()
(contents-list n)
(root-page))
(node-page (title-path n)
(contents-list n)
`(lit
. ,(chicken-doc-sxml->html (node-sxml n)
path->href
(make-def->href n)
man-filename->path))
page-title: (last (node-path n))))))))
(node-not-found p `(p "No node found at path " (i ,p))))))
;; careful: redirect-to uses the output of this. Make sure it can handle
;; relative URIs, or make relative conversion optional.
(define (path->href p) ; FIXME: use uri-relative-to, etc
(define (path->uri-string p)
(string-append
(chickadee-page-path)
"/"
(string-intersperse (map (lambda (x)
(uri-encode-string (->string x)))
p) "/")))
;; We generate a relative path from the current request uri. This
;; won't be available if generating pages statically, but here we have
;; multiple ways to generate the same page (/doc/foo, /cdoc?q=foo),
;; match pages, &c. so it is hard to guess the entry URI.
(let ((u (relative-uri (uri-reference (path->uri-string p)))))
;; (print "curreq: " (request-uri (current-request)))
;; (print "to: " u1 " from: " u2)
(uri->string u)))
;; All invocations of relative-uri subsequently call uri->string, so
;; we could just add that here.
(define (relative-uri uri)
(let ((current-uri
(update-uri (uri-reference "") ; strip all but path from request URI
path: (uri-path (request-uri (current-request))))))
(uri-relative-from uri current-uri)))
;; Given a node N, return a procedure that will produce
;; an href for any child node ID of N. Although simple now,
;; this could be extended to use relative paths when the current
;; URI permits it, saving some bandwidth.
(define (make-child->href n)
(let ((path (node-path n)))
(lambda (id)
(if (node-definition-id? n id)
(string-append "#" (quote-identifier (definition->identifier id)))
(path->href (append path (list id)))))))
;; FIXME??? chg "identifier" to html-id (or maybe, fragment to html-id)
;; Given a node N, return a procedure that will produce a definition href
;; for ID suitable for placement in a defsig in N. That is, it will refer
;; to the actual child node when N is an egg (etc.) and it will refer to
;; an anchor id in the parent when N is itself a defsig.
;; Returns #f if the ID is not a definition inside N. This is useful when
;; conditionally lighting up plaintext IDs as definition links. But when N
;; is a defsig, it does not check the parent.
(define (make-def->href n)
(let ((doc (node-sxml n))
(path (node-path n)))
(if (eq? (car doc) 'def)
(let* ((path (butlast path))
(href (path->href path)))
(lambda (id)
(and (or (string=? (->string id)
(->string (node-id n))) ; Make sure to recognize ourselves!
(node-definition-id? n id)) ; Note: Does not look in parent. Possible fixme.
(string-append href "#" (quote-identifier (definition->identifier id))))))
(lambda (id)
(and (node-definition-id? n id)
(path->href (append path (list id))))))))
(define (title-path n)
(define (links n)
(let loop ((p (node-path n))
(f '())
(r '()))
(if (null? p)
(reverse r)
(let* ((id (->string (car p)))
(f (append f (list id)))
(n (lookup-node f)))
(loop (cdr p) f (cons (path-link f id) r))))))
(intersperse (links n)
'(" " (& "raquo") " "))) ;; literal " » " would be nicer
(define (query p)
(let ((q (string-split p)))
(cond ((null? q)
(redirect-to (cdoc-page-path)))
((null? (cdr q))
(format-id p))
(else
(redirect-to (path->href q))
;; (format-path p)
)))) ; API defect
(define (incremental-search-handler _)
(with-request-vars*
$ (q)
;; FIXME: doesn't skip 0 or #f incremental-search
(let ((M (vector->list
((if (string-index q #\space)
match-paths/prefix
match-ids/prefix)
q (incremental-search)))))
(let ((body (if (null? M)
""
(let ((plen (string-length q)))
(tree->string
`("<ul>"
,(map (lambda (x)
`("<li>"
"<b>" ,(htmlize (substring x 0 plen))
"</b>"
,(htmlize (substring x plen)) "</li>"))
M)
"</ul>"))))))
;; Latency pause for debugging
(let ((pause (%chickadee:debug-incremental-search-latency)))
(if (> pause 0)
(thread-sleep! (/ pause 1000))))
;; Send last-modified headers? May not be worth it.
(cache-privately-for ; `private` has no effect on nginx proxy cache
(cache-nodes-for)
(lambda ()
(parameterize ((access-log (ajax-log))) ; Logging is extremely slow
(send-response body: body))))))))
;; Re matching, it might be more useful to match against each identifier level
;; with a separate regex.
(define (root-page)
`((h3 "Search Chicken documentation")
(p "Enter a node name or path in the search box below:")
,(search-form)
(ul (li "A node name is an identifier, egg, module or unit name, such as "
(i "open/rdonly") ", " (i "awful") ", "
(i "scheme") " or " (i "eval") ".")
(li "A node path is a sequence of node names, such as "
(i "eval load") " or " (i "foreign types") ".")
(li (i "Look up") " finds an exact match, and " (i "Regexp") " matches a regular expression.")
(li "Regular expression matching is usually done against node names,"
" but if a space is present, the full node path will be considered."))
(h4 "Quick links")
(ul (li ,(path-link '(chicken) "Chicken manual"))
(li ,(path-link '(chicken language) "Supported language"))
(li ,(path-link '(foreign) "FFI")))
(h4 "About")
(p ,(path-link '(chickadee))
" is an interface to the "
,(path-link '(chicken-doc))
" documentation system for "
(a (@ (href "http://call-cc.org")) (span (@ (style "font-variant: small-caps")) "Chicken") " Scheme")
".")))
;; Conditionally add Internet Explorer classes to <html> a la HTML5 Boilerplate.
;; Also add 'no-js' (which we will change to 'js' if JS is enabled).
;; NOTE: you must supposedly add <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
;; or send that header to avoid Compatibility View in IE -- can't reproduce and
;; the <meta> solution is dubious, so not using this until can conduct more tests.
(define (conditional-html x)
`((lit "
<!--[if lt IE 7]> <html class=\"no-js ie6 lt-ie9 lt-ie8 lt-ie7\"> <![endif]-->
<!--[if IE 7]> <html class=\"no-js ie7 lt-ie9 lt-ie8\"> <![endif]-->
<!--[if IE 8]> <html class=\"no-js ie8 lt-ie9\"> <![endif]-->
<!--[if gt IE 8]><!--> <html class=\"no-js\" lang=\"en\"> <!--<![endif]-->
"
) ,x (lit "</html>")))
;; Warning: TITLE, CONTENTS and BODY are expected to be HTML-quoted.
;; Internal fxn for node-page / not-found
(define (%node-page-body title contents body #!key (page-title #f))
(sxml->html
`((lit "<!doctype html>")
(html (@ (class "no-js"))
(head ,(charset "utf-8")
,(map css-link (chickadee-css-files))
,(map javascript (chickadee-early-js-files))
;; Remove "no-js" class and add "js" class to <HTML> when JS enabled a la Modernizr,
;; assuming Modernizr isn't already loaded.
(script "if(!window.Modernizr){"
"this.document.documentElement.className="
"this.document.documentElement.className.replace(/\\bno-js\\b/,'js')"
"}")
(title ,(if page-title
`(,page-title " | chickadee")
"chickadee server"))
(meta (@ (name "viewport")
(content "initial-scale=1"))))
(body
;; Removed navskip because #contents are now at bottom. However, a TOC skip might be nice,
;; although you can click the next section instead. Also, maybe provide a link to skip
;; to the #contents.
;; (p (@ (id "navskip"))
;; (a (@ (href "#body")) "Skip navigation."))
(div (@ (id "hdr"))
(h1 ,(path-link '() "chickadee")
,(if (null? title)
`(;; (" | " ,(path-link '(chicken-doc)) " " "server"
)
`((lit " » ") ,title)))
(h5 (label (@ (for "hdr-searchbox"))
"Identifier search"))
(form (@ (id "hdr-lookup")
(class "hdr-lookup")
(action ,(uri->string (relative-uri (uri-reference (cdoc-page-path)))))
(method "get"))
(input (@ (id "hdr-searchbox")
(name "q")
(class "text incsearch")
(data-opts ,(->json
`((url . ,(uri->string (relative-uri (incremental-search-uri))))
(delay . ,(incremental-search-delay)))))
(type "text")
(accesskey "f")
(title "chickadee search (Ctrl-F)")
(autocomplete "off")
(autocorrect "off")
(autocapitalize "off")
(tabindex "1")))
(button (@ (id "hdr-submit") (name "query-name")
(title "Search chicken-doc for this identifier")
(class "button") (type "submit"))
(& "nbsp"))))
(div (@ (id "body"))
(div (@ (id "main"))
,body))
,(maybe (not (null? contents))
`(div (@ (id "contents"))
,contents))
,(map javascript (chickadee-js-files)))))))
(define (node-page title contents body #!key (page-title #f))
(send-response
body: (%node-page-body title
contents
body
page-title: page-title)
headers: `((content-type #(text/html ((charset . "utf-8"))))
)))
(define (node-not-found title body)
;; Should create a dedicated not-found page instead;
;; but right now I don't want to duplicate main page code
(send-response code: 404 reason: "Not found"
body:
(%node-page-body title
'()
body
page-title: "node not found")))
(define cdoc-page-path (make-parameter #f)) ;; a string, not a URI -- redirect-to expects string
(define cdoc-uri
(make-parameter (uri-reference "/cdoc")
(lambda (x)
(cdoc-page-path ;; not relative--can't rely on current request being set
(and x (uri->string x)))
x)))
(define incremental-search-uri
(make-parameter (uri-reference "/cdoc/ajax/prefix")))
(define incremental-search-delay ; time in MS to delay incremental search requests
(make-parameter 50))
(define chickadee-page-path (make-parameter #f)) ; cached -- probably not necessary
(define chickadee-uri
(make-parameter (uri-reference "/chickadee")
(lambda (x)
(chickadee-page-path ;auto update (mostly for debugging)
(and x (uri->string x)))
x)))
(define chickadee-css-files
(make-parameter (list (uri-reference "/cdoc/chickadee.css"))))
(define chickadee-js-files
(make-parameter (list (uri-reference "/cdoc/chickadee.js"))))
(define chickadee-early-js-files
(make-parameter '()))
(define maximum-match-results (make-parameter 250))
(define maximum-match-signatures (make-parameter 100))
(define cache-nodes-for (make-parameter 300))
(define cache-static-content-for (make-parameter 3600))
;; Base time used for last-modified calculations, in seconds.
;; Set to (current)-seconds to invalidate pages when server is started.
(define last-modified (make-parameter 0))
;; Number of incremental search results to display; 0 or #f to disable.
(define incremental-search (make-parameter 0))
(define ajax-log (make-parameter #f)) ;; AJAX access log. #f to disable.
;; debugging: incremental search latency, in ms
(define %chickadee:debug-incremental-search-latency (make-parameter 0))
;;; Helper functions
;; Inefficient way to functionally update an alist.
(define (alist-update k v x . test)
(apply alist-update! k v (alist-copy x) test))
(define (update-param param val uri-query)
(alist-update param val uri-query))
(define (update-request-uri r u)
(make-request uri: u
;; No easy way to update request URI.
port: (request-port r)
method: (request-method r)
major: (request-major r)
minor: (request-minor r)
headers: (request-headers r)))
(define (match-path pattern path) ; just a prefix match on list; returns remainder
(let loop ((pattern pattern)
(path path))
(cond ((null? path)
(and (null? pattern)
path))
((null? pattern)
path)
((equal? (car pattern)
(car path)) ; allow re match?
(loop (cdr pattern) (cdr path)))
(else #f))))
;; calls rewriter with the current uri; restarts request with the returned uri
(define (rewrite-uri rewriter)
(let* ((r (current-request))
(u (request-uri r)))
(restart-request
(update-request-uri r (rewriter u)))))
(define (link href desc)
`(a (@ (href ,href)) ,desc))
(define (path-link path #!optional desc)
(link (path->href path)
(or desc (string-intersperse (map ->string path) " "))))
(define ($ var #!optional converter/default) ; from awful
((http-request-variables) var converter/default))
(define http-request-variables (make-parameter #f))
;; note: missing full node path should maybe generate 404
(define (redirect-to path #!key (code 302) (reason "Found") (headers '()))
(send-response code: code
reason: reason
headers: `((location ,(uri-relative-to
(uri-reference path)
(request-uri (current-request)) ;; spiffy 4.8
)))))
;; Return 304 Not Modified. If ACTUAL-MTIME is an integer, it is
;; returned to the client as the actual modification time of the resource.
;; You should also resend any associated Cache-control: directive (separately).
(define (not-modified actual-mtime)
(let ((headers (if (integer? actual-mtime) ; error?
`((last-modified #(,(seconds->utc-time actual-mtime) ())))
'())))
(send-response code: 304 reason: "Not modified" headers: headers)))
;; Compare mtime with If-Modified-Since: header in client request.
;; If newer, client's copy of resource is outdated and we execute thunk.
;; Otherwise, return 304 Not Modified.
(define (last-modified-at mtime thunk)
(let ((header-mtime-vec (header-value
'if-modified-since
(request-headers (current-request)))))
(if (or (not header-mtime-vec)
(> mtime (utc-time->seconds header-mtime-vec)))
(with-headers `((last-modified #(,(seconds->utc-time mtime) ())))
thunk)
(not-modified mtime))))
;; SECONDS: number of seconds to cache for; or #t to set a far-future
;; expiration date (1 year as per RFC); or #f to force no caching.
(define (cache-for seconds thunk)
(if (not seconds)
(with-headers `((cache-control (max-age . 0) ; use "no-cache" ?
(must-revalidate . #t))) thunk)
(let ((seconds (if (integer? seconds)
(min seconds 31536000)
31536000)))
(with-headers `((cache-control (max-age . ,seconds))) thunk))))
(define (cache-privately-for seconds thunk)
(if (not seconds)
(with-headers `((x-accel-expires 0) ; nginx hack
(cache-control (max-age . 0)
(must-revalidate . #t)
(private . #t))))
(let ((seconds (if (integer? seconds)
(min seconds 31536000)
31536000)))
(with-headers `((x-accel-expires 0) ; nginx hack
(cache-control (private . #t)
(max-age . ,seconds)))
thunk))))
;; (define (uri-path->string p) ; (/ "foo" "bar") -> "/foo/bar"
;; (uri->string (update-uri (uri-reference "")
;; path: p)))
(define (proxy-logger)
;; access logger with X-Forwarded-For: header
;; Copied verbatim from spiffy's handle-access-logging
(let ((h (request-headers (current-request))))
(log-to (access-log)
"~A ~A [~A] \"~A ~A HTTP/~A.~A\" ~A \"~A\" \"~A\""
(header-value 'x-forwarded-for h "-")
(remote-address)
(seconds->string (current-seconds))
(request-method (current-request))
(uri->string (request-uri (current-request)))
(request-major (current-request))
(request-minor (current-request))
(response-code (current-response))
(uri->string (header-value 'referer h (uri-reference "-")))
(let ((product (header-contents 'user-agent h)))
(if product
(product-unparser product) ; undocumented intarweb proc
"**Unknown product**")))))
;;;
(define (chickadee-handler p)
(let ((path (string-intersperse p " ")))
(format-path path)))
;; 'id' variable is never used externally nor is it generated in internal links.
;; 'q' and 'id' are identical, as long as there is no space present, and query-regex is not set.
(define (cdoc-handler p)
p ;ignore
(with-request-vars*
$ (id path q)
(cond (path => format-path)
(id => format-id)
(q => (lambda (p)
(with-request-vars*
$ (query-regex query-name)
(if query-regex
(if (string-index p #\space) ; hmm
(format-path-re p)
(format-re p))
(query p)))))
(else (format-path "")))))
;;; handlers
;; vhost-map can be used to take control of requests as
;; they come in, before any handlers are invoked.
(define +vhost-map+
`((".*" . ,(lambda (continue)
(let ((p (uri-path (request-uri (current-request)))))
(parameterize ((http-request-variables (request-vars))) ; for $
(cond ((equal? (uri-path (cdoc-uri)) p)
=> cdoc-handler)
((match-path (uri-path (chickadee-uri)) p)
=> chickadee-handler)
((and (incremental-search-uri)
(equal? (uri-path (incremental-search-uri)) p))
=> incremental-search-handler)
;; Last resort redirect of root path to main page.
((equal? p '(/ ""))
(redirect-to (path->href '())))
(else
(continue)))))))))
(define +not-found-handler+
(let ((old-handler (handle-not-found))) ; hmm
(lambda (path) ; useless
(old-handler path))))
(define +static-file-handler+
(let ((old-handler (handle-file)))
(lambda (path)
(cache-for (cache-static-content-for)
(lambda ()
(old-handler path))))))
;;; start server
(define (chickadee-start-server)
(verify-repository)
;; using parameterize, we cannot override in REPL
(parameterize ((vhost-map +vhost-map+)
(handle-not-found +not-found-handler+)
(handle-file +static-file-handler+)
(handle-access-logging proxy-logger)
(tcp-buffer-size 1024)
(mime-type-map
`(("js" . application/x-javascript) ;; spiffy has subpar mime-type
. ,(mime-type-map))))
(start-server))))
;; time echo "GET /cdoc?q=p&query-regex=Regex HTTP/1.0" | nc localhost 8080 >/dev/null
;; (1374 matches) real 0m1.382s (warm cache)
;; real 0m1.098s (turn signatures off)