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Support multi-file emacswiki packages, with rate-limiting of http requests

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This commit is contained in:
Steve Purcell 2012-03-19 12:50:51 +00:00
parent a0f471f415
commit badee655ee
1 changed files with 38 additions and 11 deletions
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49
package-build.el
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@ -99,21 +99,49 @@ the same arguments."
(funcall (intern (format "pb/checkout-%s" repo-type))
name config cwd)))
(defvar pb/last-wiki-fetch-time 0
"The time at which an emacswiki URL was last requested.
This is used to avoid exceeding the rate limit of 1 request per 2
seconds; the server cuts off after 10 requests in 20 seconds.")
(defvar pb/emacswiki-min-request-interval 2
"The shortest permissible interval between successive requests for Emacswiki URLs.")
(defmacro pb/with-emacswiki-rate-limit (&rest body)
"Rate-limit BODY code passed to this macro to match EmacsWiki's rate limiting."
(let ((now (gensym))
(elapsed (gensym)))
`(let* ((,now (float-time))
(,elapsed (- ,now pb/last-wiki-fetch-time)))
(when (< ,elapsed pb/emacswiki-min-request-interval)
(let ((wait (- pb/emacswiki-min-request-interval ,elapsed)))
(message "Waiting %s secs before hitting Emacswiki again" wait)
(sleep-for wait)))
(unwind-protect
(progn ,@body)
(setq pb/last-wiki-fetch-time (float-time))))))
(defun pb/grab-wiki-file (filename)
"Download FILENAME from emacswiki, returning its last-modified time."
(let* ((download-url (format "http://www.emacswiki.org/emacs/download/%s" filename))
(wiki-url (format "http://www.emacswiki.org/emacs/%s" filename)))
(pb/with-emacswiki-rate-limit
(url-copy-file download-url filename t))
(with-current-buffer (pb/with-emacswiki-rate-limit
(url-retrieve-synchronously wiki-url))
(pb/find-parse-time
"Last edited \\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} [0-9]\\{2\\}:[0-9]\\{2\\} [A-Z]\\{3\\}\\)"))))
(defun pb/checkout-wiki (name config dir)
"Checkout package NAME with config CONFIG from the EmacsWiki into DIR."
(with-current-buffer (get-buffer-create "*package-build-checkout*")
(message dir)
(unless (file-exists-p dir)
(make-directory dir))
(let* ((filename (or (car (plist-get config :files))
(format "%s.el" name)))
(default-directory dir)
(download-url (format "http://www.emacswiki.org/emacs/download/%s" filename))
(wiki-url (format "http://www.emacswiki.org/emacs/%s" filename)))
(url-copy-file download-url filename t)
(with-current-buffer (url-retrieve-synchronously wiki-url)
(pb/find-parse-time
"Last edited \\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} [0-9]\\{2\\}:[0-9]\\{2\\} [A-Z]\\{3\\}\\)")))))
(let ((files (or (plist-get config :files)
(list (format "%s.el" name))))
(default-directory dir))
(car (nreverse (sort (mapcar 'pb/grab-wiki-file files) 'string-lessp))))))
(defun pb/darcs-repo (dir)
"Get the current darcs repo for DIR."
@ -334,8 +362,7 @@ If PKG-INFO is nil, an empty one is created."
(cond
((not version)
(print (format "Unable to check out repository for %s" name)))
((or (eq 'wiki (plist-get cfg :fetcher))
(= 1 (length files)))
((< (length files) 2)
(let* ((pkgsrc (expand-file-name (or (car files)
(concat file-name ".el"))
pkg-cwd))