Catch and display search errors more usefully.

copyvios/checker.py

@@ -67,10 +67,15 @@ def _get_results(query, follow=True):
         if not query.nocache:
             query.result = _get_cached_results(page, conn, mode, query.noskip)
         if not query.result:
-            query.result = page.copyvio_check(
-                min_confidence=T_SUSPECT, max_queries=10, max_time=45,
-                no_searches=not use_engine, no_links=not use_links,
-                short_circuit=not query.noskip)
+            try:
+                query.result = page.copyvio_check(
+                    min_confidence=T_SUSPECT, max_queries=10, max_time=45,
+                    no_searches=not use_engine, no_links=not use_links,
+                    short_circuit=not query.noskip)
+            except exceptions.SearchQueryError as exc:
+                query.error = "search error"
+                query.exception = exc
+                return
             query.result.cached = False
             _cache_result(page, query.result, conn, mode)
     elif query.action == "compare":

templates/index.mako

@@ -30,6 +30,10 @@
         <div id="info-box" class="red-box">
             <p>The URL <a href="${query.url | h}">${query.url | h}</a> timed out before any data could be retrieved.</p>
         </div>
+    % elif query.error == "search error"
+        <div id="info-box" class="red-box">
+            <p>An error occurred while using the search engine (${query.exception}). Try reloading the page. If the error persists, <a href="${request.url | httpsfix, h}&amp;use_engine=0">repeat the check without using the search engine</a>.</p>
+        </div>
     % elif not query.site:
         <div id="info-box" class="red-box">
             <p>The given site (project=<b><span class="mono">${query.project | h}</span></b>, language=<b><span class="mono">${query.lang | h}</span></b>) doesn't seem to exist. It may also be closed or private. <a href="//${query.lang | h}.${query.project | h}.org/">Confirm its URL.</a></p>