Added better error handling and coroutine checking

sanic/exceptions.py

@@ -0,0 +1,28 @@
+from .response import html
+
+class NotFound(Exception):
+	status_code = 404
+class InvalidUsage(Exception):
+	status_code = 400
+class ServerError(Exception):
+	status_code = 500
+
+class Handler:
+	handlers = None
+	def __init__(self):
+		self.handlers = {}
+
+	def add(self, exception_type, handler):
+		self.handlers[exception_type] = handler
+
+	def response(self, request, exception):
+		handler = self.handlers.get(type(exception))
+		if handler:
+			response = handler(request, exception)
+		else:
+			response = Handler.default(request, exception)
+		return response
+
+	@staticmethod
+	def default(request, exception):
+		return html("Error: {}".format(exception), status=getattr(exception, 'status_code', 500))

sanic/response.py

@@ -2,7 +2,17 @@ import ujson
 
 STATUS_CODES = {
     200: 'OK',
-    404: 'Not Found'
+    400: 'Bad Request',
+    401: 'Unauthorized',
+    402: 'Payment Required',
+    403: 'Forbidden',
+    404: 'Not Found',
+    400: 'Method Not Allowed',
+    500: 'Internal Server Error',
+    501: 'Not Implemented',
+    502: 'Bad Gateway',
+    503: 'Service Unavailable',
+    504: 'Gateway Timeout',
 }
 class HTTPResponse:
     __slots__ = ('body', 'status', 'content_type')
@@ -36,12 +46,9 @@ class HTTPResponse:
             #b'\r\n'
         ])
 
-
-def error_404(request, *args):
-    return HTTPResponse("404!", status=404)
-error_404.is_async = False
-
-def json(input):
-    return HTTPResponse(ujson.dumps(input), content_type="application/json")
-def text(input):
-    return HTTPResponse(input, content_type="text/plain")
+def json(body, status=200):
+    return HTTPResponse(ujson.dumps(body), status=status, content_type="application/json")
+def text(body, status=200):
+    return HTTPResponse(body, status=status, content_type="text/plain")
+def html(body, status=200):
+    return HTTPResponse(body, status=status, content_type="text/html")

sanic/router.py

@@ -1,19 +1,19 @@
 from .log import log
+from .exceptions import NotFound
 
 class Router():
 	routes = None
-	default = None
 
-	def __init__(self, default=None):
+	def __init__(self):
 		self.routes = {}
-		self.default=default
 
-	def add(self, route, handler):
-		self.routes[route] = handler
+	def add(self, uri, handler):
+		self.routes[uri] = handler
 
-	def get(self, uri):
-		handler = self.routes.get(uri.decode('utf-8'), self.default)
+	def get(self, request):
+		uri_string = request.url.decode('utf-8')
+		handler = self.routes.get(uri_string)
 		if handler:
 			return handler
 		else:
-			return self.default
+			raise NotFound("Requested URL {} not found".format(uri_string))

sanic/sanic.py

@@ -1,24 +1,29 @@
-import inspect
 from .router import Router
-from .response import HTTPResponse, error_404
+from .exceptions import Handler
+from .response import HTTPResponse
 from .server import serve
 from .log import log
 
 class Sanic:
     name = None
+    router = None
+    error_handler = None
     routes = []
 
-    def __init__(self, name, router=None):
+    def __init__(self, name, router=None, error_handler=None):
         self.name = name
-        self.router = router or Router(default=error_404)
+        self.router = router or Router()
+        self.error_handler = error_handler or Handler()
 
     def route(self, *args, **kwargs):
         def response(handler):
-            handler.is_async = inspect.iscoroutinefunction(handler)
-            self.router.add(*args, **kwargs, handler=handler)
+            self.add_route(handler, *args, **kwargs)
             return handler
 
         return response
 
+    def add_route(self, handler, *args, **kwargs):
+        self.router.add(*args, **kwargs, handler=handler)
+
     def run(self, host="127.0.0.1", port=8000, debug=False):
-        return serve(router=self.router, host=host, port=port, debug=debug)
+        return serve(sanic=self, host=host, port=port, debug=debug)

sanic/server.py

@@ -5,6 +5,7 @@ import signal
 import functools
 import httptools
 import logging
+from inspect import iscoroutine
 from ujson import loads as json_loads
 from urllib.parse import parse_qs
 
@@ -18,6 +19,7 @@ from socket import *
 
 from .log import log
 from .config import LOGO
+from .exceptions import ServerError
 from .response import HTTPResponse
 
 PRINT = 0
@@ -65,16 +67,16 @@ class HttpProtocol(asyncio.Protocol):
 
     __slots__ = ('loop',
                  'transport', 'request', 'parser',
-                 'url', 'headers', 'router')
+                 'url', 'headers', 'sanic')
 
-    def __init__(self, *, router, loop):
+    def __init__(self, *, sanic, loop):
         self.loop = loop
         self.transport = None
         self.request = None
         self.parser = None
         self.url = None
         self.headers = None
-        self.router = router
+        self.sanic = sanic
 
     # -------------------------------------------- #
     # Connection
@@ -140,14 +142,22 @@ class HttpProtocol(asyncio.Protocol):
     # -------------------------------------------- #
 
     async def get_response(self, request):
-        handler = self.router.get(request.url)
         try:
-            if handler.is_async:
-                response = await handler(request)
-            else:
+            handler = self.sanic.router.get(request)
+            if handler is None:
+                raise ServerError("'None' was returned while requesting a handler from the router")
+
             response = handler(request)
+
+            # Check if the handler is asynchronous
+            if iscoroutine(response):
+                response = await response
+
         except Exception as e:
-            response = HTTPResponse("Error: {}".format(e))
+            try:
+                response = self.sanic.error_handler.response(request, e)
+            except Exception as e:
+                response = HTTPResponse("Error while handling error: {}".format(e))
         
         self.write_response(request, response)
 
@@ -184,7 +194,7 @@ def abort(msg):
     sys.exit(1)
 
 
-def serve(router, host, port, debug=False):
+def serve(sanic, host, port, debug=False):
     # Create Event Loop
     loop = async_loop.new_event_loop()
     asyncio.set_event_loop(loop)
@@ -205,7 +215,7 @@ def serve(router, host, port, debug=False):
     # Serve
     log.info('Goin\' Fast @ {}:{}'.format(host, port))
 
-    server_coroutine = loop.create_server(lambda: HttpProtocol(loop=loop, router=router), host, port)
+    server_coroutine = loop.create_server(lambda: HttpProtocol(loop=loop, sanic=sanic), host, port)
     server_loop = loop.run_until_complete(server_coroutine)
     try:
         loop.run_forever()

test.py

@@ -1,5 +1,6 @@
 from sanic import Sanic
 from sanic.response import json, text
+from sanic.exceptions import ServerError
 
 app = Sanic("test")
 
@@ -11,6 +12,14 @@ async def test(request):
 def test(request):
     return text('hi')
 
+@app.route("/exception")
+def test(request):
+    raise ServerError("yep")
+
+@app.route("/exception/async")
+async def test(request):
+    raise ServerError("asunk")
+
 @app.route("/post_json")
 def test(request):
     return json({ "received": True, "message": request.json })