Fix: handle dns errors

1 files changed, 19 insertions, 6 deletions

diff --git a/fussy.lisp b/fussy.lisp
index 7b6d706..2df651e 100644
--- a/fussy.lisp
+++ b/fussy.lisp
@@ -4,6 +4,9 @@
 (defvar +default-emacs-package-archive+
   "https://melpa.org/packages/archive-contents")
 
+(defparameter +retry-wait+ 60
+  "Nubmer of seconds to wait between http request retries.")
+
 (defun emacs-reader-readtable ()
   "Return a readtable that will read the emacs package archive
 contents."
@@ -15,15 +18,25 @@ contents."
       (set-macro-character #\] (get-macro-character #\) nil))
       *readtable*)))
 
-(defun fetch-emacs-archive (&optional (archive +default-emacs-package-archive+))
+(defun fetch-emacs-archive
+    (&optional
+       (archive +default-emacs-package-archive+)
+       (retries 10))
   "Fetch the package archive from ARCHIVE, a url, and read it in using
 the emacs' reader readtable."
   ;; TODO: HANDLE HTTP ERRORS, HANDLE TIMEOUT, HANDLE READ ERRORS
-  (multiple-value-bind (stream status) (dexador:get archive :want-stream t)
-    (when (= 200 status)
-      (let* ((*package* (find-package :fussy))
-             (*readtable* (emacs-reader-readtable)))
-        (read stream)))))
+  (when (plusp retries)
+    (handler-case
+        (multiple-value-bind (stream status) (dexador:get archive :want-stream t)
+          (when (= 200 status)
+            (let* ((*package* (find-package :fussy))
+                   (*readtable* (emacs-reader-readtable)))
+              (read stream))))
+      (usocket:ns-host-not-found-error ()
+        (fussy-log "Host Not Found: ~a~%Retrying in ~a seconds...~%"
+                   archive +retry-wait+)
+        (sleep +retry-wait+)
+        (fetch-emacs-archive archive (1- retries))))))
 
 (defclass/std theme-pkg (db:store-object)
   ((name