This is not Drakma specific:
(defun try-request-from-multiple-urls (&rest urls) (loop (with-simple-restart (try-next "Try next URL") (handler-case (let ((url (first urls))) (format t "requesting ~A~%" url) (return (drakma:http-request url))) (usocket:timeout-error () (setf urls (rest urls)) (unless urls (format t "no more urls, returning~%") (return)) (format t "timeout, trying next url~%") (invoke-restart 'try-next))))))
Tune as desired. If you want to have the last timeout error percolate to the caller, you'll want handler-bind instead.
-Hans
On Wed, Jun 12, 2013 at 9:42 PM, Patrick May patrick.may@mac.com wrote:
I have a list of IP addresses to poll and want to catch theUSOCKET:TIMEOUT-ERROR from Drakma when a machine isn't available, log a message, and continue on mapping over the list. Does anyone have an example of how to do this?
Thanks,
Patrick