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Store content hashes and timestamps for emacswiki files to minimise requests
If we can determine whether an emacswiki .el file has changed since the last download, we can usually skip the follow-up request to determine its last-modified timestamp.
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1 changed files with 22 additions and 5 deletions
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@ -178,11 +178,28 @@ seconds; the server cuts off after 10 requests in 20 seconds.")
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(url-copy-file download-url filename t))
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(when (zerop (nth 7 (file-attributes filename)))
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(error "Wiki file %s was empty - has it been removed?" filename))
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(with-current-buffer (pb/with-wiki-rate-limit
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(url-retrieve-synchronously wiki-url))
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(message (format "%s\n" download-url))
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(pb/find-parse-time
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"Last edited \\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} [0-9]\\{2\\}:[0-9]\\{2\\} [A-Z]\\{3\\}\\)"))))
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;; The Last-Modified response header for the download is actually
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;; correct for the file, but we have no access to that
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;; header. Instead, we must query the non-raw emacswiki page for
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;; the file.
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;; Since those Emacswiki lookups are time-consuming, we maintain a
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;; foo.el.stamp file containing ("SHA1" . "PARSED_TIME")
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(let* ((new-content-hash (secure-hash 'sha1 (pb/slurp-file filename)))
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(stamp-file (concat filename ".stamp"))
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(stamp-info (pb/read-from-file stamp-file)))
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(if (eq new-content-hash (car stamp-info))
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;; File has not changed, so return old timestamp
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(progn
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(message "%s is unchanged" filename)
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(cdr stamp-info))
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(message "%s has changed - checking mod time" filename)
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(let ((new-timestamp
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(with-current-buffer (pb/with-wiki-rate-limit
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(url-retrieve-synchronously wiki-url))
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(pb/find-parse-time
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"Last edited \\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\} [0-9]\\{2\\}:[0-9]\\{2\\} [A-Z]\\{3\\}\\)"))))
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(pb/dump (cons new-content-hash new-timestamp) stamp-file)
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new-timestamp)))))
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(defun pb/checkout-wiki (name config dir)
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"Checkout package NAME with config CONFIG from the EmacsWiki into DIR."
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