Add SHOW_BLOCK_ALERT config option.

app.py

@@ -113,8 +113,9 @@ def init_profile():
 def global_user():
     g.user = wikidata_oauth.get_username()
 
-@app.before_request
-def get_blocks():
+def check_for_blocks():
+    if hasattr(g, 'server_ip'):  # already done
+        return
     hostname = app.config.get('HOSTNAME')
     if not hostname:
         return
@@ -127,6 +128,11 @@ def get_blocks():
     except Exception:
         pass
 
+@app.before_request
+def get_blocks():
+    if app.config.get('SHOW_BLOCK_ALERT') is not False:
+        check_for_blocks()
+
 @app.route('/find_more_setting')
 def flip_find_more():
     session['no_find_more'] = not session.get('no_find_more')
@@ -1075,6 +1081,7 @@ def wikidata_query_list():
 
 @app.route('/report/blocks')
 def server_block_report():
+    check_for_blocks()
     return render_template('block_report.html')