make sure exception handling gets called on error, and also not on 404

lightbluetent/app.py

@@ -1,12 +1,14 @@
 import os, subprocess, logging
 import logging.handlers
 from flask import Flask
+from werkzeug.exceptions import HTTPException
 from . import rooms, users, society, admins, general
 from .flask_seasurf import SeaSurf
 from flask_talisman import Talisman
 from flask_babel import Babel
 from .utils import gen_unique_string, ordinal, sif, page_not_found, server_error, table_exists
 from lightbluetent.models import db, migrate, Setting, Role, Permission, User
+from functools import wraps
 import click
 
 
@@ -32,14 +34,29 @@ def configure_logging(app):
 
     @app.errorhandler(Exception)
     def exception_interceptor(e):
+        if isinstance(e, HTTPException):
+            code = e.code
+            if (code // 100) == 3:
+                # redirection, this probably never gets called though...
+                return e.get_response(request.environ), code
         app.logger.exception(e)
-        raise e
+        return server_error(e)
 
     @app.route('/oops')
     def oops():
         1/0
 
 
+def logging_wrapper(log_fun):
+    def decorator(f):
+        @wraps(f)
+        def wrapped(e, *a, **k):
+            log_fun(e)
+            return f(e, *a, **k)
+        return wrapped
+    return decorator
+
+
 def create_app(config_name=None):
 
     if config_name == None:
@@ -80,8 +97,8 @@ def create_app(config_name=None):
     app.register_blueprint(users.bp)
     app.register_blueprint(society.bp)
     app.register_blueprint(admins.bp)
-    app.register_error_handler(404, page_not_found)
-    app.register_error_handler(500, server_error)
+    app.register_error_handler(404, logging_wrapper(app.logger.info)(page_not_found))
+    app.register_error_handler(500, logging_wrapper(app.logger.exception)(server_error))
 
     @app.context_processor
     def inject_gh_rev():