Wed Jun 29 03:08:25 UTC 2011  pix@kepibu.org
  * Wrap drakma:http-request so we can have automatic retries on timeouts
diff -rN -u old-claki/claki.lisp new-claki/claki.lisp
--- old-claki/claki.lisp	2015-10-11 08:43:14.000000000 +0000
+++ new-claki/claki.lisp	2015-10-11 08:43:14.000000000 +0000
@@ -6,13 +6,25 @@
 
 #+(or) (clrhash *last-modified*)
 
+(defun http-request (&rest drakma-args)
+  "A wrapper around drakma:http-request which automatically retries the request
+in the event of a timeout."
+  (let ((times-failed 0))
+    (tagbody
+     :fetch-page
+       (handler-case (return-from http-request (apply #'drakma:http-request drakma-args))
+         (usocket:timeout-error ()
+           (sleep (* 60 (expt 2 times-failed)))
+           (incf times-failed)
+           (go :fetch-page))))))
+
 (defun get-cliki-page (url)
   "Returns a page from cliki if it has been modified since we last saw it or nil
 if it has not been modified.  Signals an error otherwise."
   (multiple-value-bind (page status headers)
-      (drakma:http-request (format nil "http://cliki.net/~a" url)
-                           :additional-headers (when (gethash url *last-modified*)
-                                                 `((:if-modified-since (gethash url *last-modified*)))))
+      (http-request (format nil "http://cliki.net/~a" url)
+                    :additional-headers (when (gethash url *last-modified*)
+                                          `((:if-modified-since (gethash url *last-modified*)))))
     ;; FIXME: this doesn't work all that well: it turns out cliki uses a single
     ;; last-modified header for the entire wiki, rather than one per page, so we
     ;; aren't saving ourselves (or cliki) much with this.
@@ -176,14 +188,14 @@
 
 (defun revert-page (url current-version to-version)
   (multiple-value-bind (page status headers)
-      (drakma:http-request (format nil "http://cliki.net/edit/~a" url)
-                           :method :post
-                           :parameters `(("version" . ,current-version)
-                                         ("T0"      . "BODY")
-                                         ("E0"      . ,(get-cliki-source url to-version))
-                                         ("summary" . "Spam detected, reverting to Known-Good.")
-                                         ("captcha" . "lisp")
-                                         ("name"    . "Claki (Revertobot Beta)")))
+      (http-request (format nil "http://cliki.net/edit/~a" url)
+                    :method :post
+                    :parameters `(("version" . ,current-version)
+                                  ("T0"      . "BODY")
+                                  ("E0"      . ,(get-cliki-source url to-version))
+                                  ("summary" . "Spam detected, reverting to Known-Good.")
+                                  ("captcha" . "lisp")
+                                  ("name"    . "Claki (Revertobot Beta)")))
     (declare (ignore headers))
     (cond
       ((and (= status 200)
@@ -198,7 +210,7 @@
 returns the text you should POST to revert a cliki page to the given version."
   (or (find-in-cache url version)
       (multiple-value-bind (page status headers)
-          (drakma:http-request (format nil "http://cliki.net/~a?source&v=~a" url version))
+          (http-request (format nil "http://cliki.net/~a?source&v=~a" url version))
         (declare (ignore headers))
         (cond
           ((= 200 status)