Routing

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Introduction
Routing
Routing
Routing is the core of any web framework because it allows the user to map URL endpoints to functions.
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@app.route("/home", methods=['GET'])
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async def home():
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    return Response(b'123')
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In this example you are mapping every HTTP request with a GET method and a path equals to /home to async def home().
Request Parameters
Often parts of an URL have a special meaning, for example, specifying which product should be displayed.
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@app.route('/product/<product_id>')
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async def show_product(product_id: int):
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    return Response(f'Chosen product: {product_id}'.encode())
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Not usually you'll need something more sophisticated. Vibora allows regular expressions as route patterns.
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import re
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​
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@app.route(re.compile('/product/(?P<product_id>[0-9]+)'))
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async def show_product(product_id: int):
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    return Response(f'Chosen product: {product_id}'.encode())
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Virtual Hosts
Maybe you have different domains and you want to host them all with a single Vibora application. So http://docs.vibora.io/ and http://vibora.io/ would hit the same application but return different responses based on the HTTP host header. Vibora makes it very easy thanks to the hosts attribute.
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@app.route('/', hosts=['docs.vibora.io'])
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async def docs():
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    return Response(b'Docs')
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​
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@app.route('/', hosts=['vibora.io'])
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async def home():
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    return Response(b'Home')
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To avoid repeating the hosts attribute for every route, you can group routes using a Blueprint.
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from vibora.blueprints import Blueprint
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from vibora.responses import Response
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​
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​
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docs = Blueprint(hosts=['docs.vibora.io'])
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main = Blueprint(hosts=['vibora.io'])
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​
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​
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@docs.route('/')
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async def docs():
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    return Response(b'docs')
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​
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​
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@main.route('/')
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async def home():
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    return Response(b'main')
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Router Strategies
A common source of headaches in URL routing are ending slashes.
Let's take the path /home and /home/ for example.
In a web environment these are two completely different paths, it's up to the server to interpret those as the same or not.
Vibora has three different strategies to deal with this problem:
1.Strict. Does nothing. If you map your endpoints ending with
slashes then if you try to access /home instead of /home/
you'll get a 404 response.
2.Redirect (Default). If you map your route as /home then
Vibora will return a 302 response if someone tries to access /home/
and vice-versa.
3.Clone. This one is similar to redirect but instead of a 302 it'll
return the same response for both routes.
Configuration example:
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from vibora import Vibora
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from vibora.router import RouterStrategy
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​
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app = Vibora(router_strategy=RouterStrategy.STRICT)
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Caching
Caching can be a tremendous ally when handling performance issues. Imagine an API that does a read-only query being hit by 10k requests/sec, this means that you are stressing your database at 10k queries/sec.
If you start caching the response for at least one second you drop from 10k queries/sec to 1 query per second. That's a huge improvement with almost no effort.
Vibora has some internal optimizations to speed-up cached APIs so instead of handling it all by ourselves, you should use the CacheEngine.
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from vibora import Vibora, Response, Request
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from vibora.cache import CacheEngine
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​
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app = Vibora()
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​
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​
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class YourCacheEngine(CacheEngine):
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    async def get(self, request: Request):
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        return self.cache.get(request.url)
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​
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    async def store(self, request: Request, response):
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        self.cache[request.url] = response
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​
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​
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@app.route('/', cache=YourCacheEngine(skip_hooks=True))
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def home():
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    return Response(b'Hello World')
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Notice the "skip_hooks" parameter which makes cached responses to skip any listeners/hooks. Sometimes this is useful, often not, use wisely.
Static Files
Vibora is fast enough to host static files and it tries hard to implement the same features as some battle proven solutions like Nginx.
By default Vibora will seek for a directory called "static" in the same parent directory related to the file that created Vibora app instance.
You can configure the StaticHandler as bellow:
All parameters are optional.
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from vibora.static import StaticHandler
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​
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app = Vibora(
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    static=StaticHandler(
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        paths=['/your_static_dir', '/second_static_dir'],
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        host='static.vibora.io',
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        url_prefix='/static',
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        max_cache_size=1 * 1024 * 1024
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    )
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)
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Host parameter can be used to only serve static files when the Host header matches this specific host.
max_cache_size specifies the amount of memory that Vibora may invest into optimizations.
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