fix on shutdown and adds app.on_error

docs/api.md

@@ -6,6 +6,7 @@ class App:
 
     def on_start(self, method: callable):
     def on_shutdown(self, method: callable):
+    def on_error(self, method: callable):    
     def router(self, prefix: str="", *middlewares):
     def register(self, extension):
     def template(self, template_engine):

docs/basics.md

@@ -246,7 +246,8 @@ Both `app.on_start` and `app.on_shutdown` can be sync or async.
 ```python
 from socketify import App
 
-def run(app: App)
+def run(app: App):
+    
     @app.on_start
     async def on_start():
         print("wait...")
@@ -265,5 +266,35 @@ def run(app: App)
     def home(res, req):
         res.send("Hello, World!")
 
+```
+
+# Error handler events
+You can set a error handler to give the user an custom 500 page and/or for logging properly
+
+Using `app.set_error_handler(on_error)` or `app.on_error` decorator.
+
+
+```python
+from socketify import App
+
+def run(app: App):
+
+    @app.on_error
+    def on_error(error, res, req):
+        # here you can log properly the error and do a pretty response to your clients
+        print("Somethind goes %s" % str(error))
+        # response and request can be None if the error is in an async function
+        if res != None:
+            # if response exists try to send something
+            res.write_status(500)
+            res.end("Sorry we did something wrong")
+
+    router = app.router()
+
+    @router.get("/")
+    def home(res, req):
+        raise RuntimeError("Oops!")
+
+
 ```
 ### Next [Upload and Post](upload-post.md)

examples/error_handler.py

@@ -9,11 +9,12 @@ def xablau(res, req):
 
 
 async def async_xablau(res, req):
-    await asyncio.sleep(1)
     raise RuntimeError("Async Xablau!")
 
 
+
 # this can be async no problems
+@app.on_error
 def on_error(error, res, req):
     # here you can log properly the error and do a pretty response to your clients
     print("Somethind goes %s" % str(error))
@@ -27,7 +28,8 @@ def on_error(error, res, req):
 app.get("/", xablau)
 app.get("/async", async_xablau)
 
-app.set_error_handler(on_error)
+# you can also use set_error_handler
+# app.set_error_handler(on_error)
 
 app.listen(
     3000,

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "socketify"
-version = "0.0.5"
+version = "0.0.6"
 authors = [
   { name="Ciro Spaciari", email="ciro.spaciari@gmail.com" },
 ]

setup.py

@@ -58,7 +58,7 @@ with open("README.md", "r", encoding="utf-8") as fh:
 
 setuptools.setup(
     name="socketify",
-    version="0.0.5",
+    version="0.0.6",
     platforms=["any"],
     author="Ciro Spaciari",
     author_email="ciro.spaciari@gmail.com",

src/socketify/socketify.py

@@ -2561,6 +2561,7 @@ class App:
         self._response_extension = None
         self._ws_extension = None
         self._on_start_handler  = None
+        self._on_shutdown_handler = None
 
     def on_start(self, method: callable):
         self._on_start_handler  = method
@@ -3253,6 +3254,10 @@ class App:
         self.loop.stop()
         return self
 
+    def on_error(self, handler):
+        self.set_error_handler(handler)
+        return handler
+
     def set_error_handler(self, handler):
         if hasattr(handler, "__call__"):
             self.error_handler = handler
@@ -3271,6 +3276,7 @@ class App:
         else:
             try:
                 if inspect.iscoroutinefunction(self.error_handler):
+                    print("coroutine!", error)
                     self.run_async(
                         self.error_handler(error, response, request), response
                     )