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 # Solga: simple typesafe routing [![Build Status](https://travis-ci.org/chpatrick/solga.svg?branch=master)](https://travis-ci.org/chpatrick/solga)
+
+[Haddock](http://chpatrick.github.io/solga/doc/solga-0.1.0.0/Solga.html)
+
+A library for easily specifying web APIs and implementing them in a type-safe way.
+
+## Implementing services
+
+At the center of Solga is a typeclass called `Router`. You can serve any `Router` as a WAI application:
+
+```
+serve :: Router r => r -> Wai.Application
+```
+
+`Router`s are generally simple `newtypes`. For example, to serve a fixed JSON response, just use:
+
+```
+-- From Solga:
+newtype JSON a = JSON {jsonResponse :: a}
+
+instance ToJSON a => Router (JSON a)
+```
+This router will respond to every request with the given `jsonResponse`, ie. `serve (JSON "It works!")` produces an `Application` that always responds with "It works!".
+
+Routers can also be composed. Let's say you only want to respond to GET requests under `/does-it-work`. We'll encode the path and the method in the type itself with `DataKinds`.
+
+```
+type MyAPI = Seg "does-it-work" (Method "GET" (JSON Text))
+
+myAPI :: MyAPI
+myAPI = Seg (Method (JSON "It works"))
+```
+
+There's some syntactic sugar we can apply here. First, let's use the `:>` operator to compose our routers. This is the same as type application.
+
+```
+-- From Solga:
+-- type f :> g = f g
+
+type MyAPI = Seg "does-it-work" :> Method "GET" :> JSON Text
+```
+
+Second, we can replace `Seg` with `/>`:
+
+```
+-- From Solga:
+-- type (/>) (seg :: Symbol) g = Seg seg :> g
+
+type MyAPI = "does-it-work" /> Method "GET" :> JSON Text
+```
+
+And third, we can get rid of the constructor boilerplate using `brief`:
+
+```
+myAPI :: MyAPI
+myAPI = brief "It works!"
+```
+
+What if we want to serve multiple different routes? It's easy - any product of Routers is automatically a Router, and Solga will try each field in order:
+
+```
+data MyAPI = MyAPI
+  { doesItWork :: "does-it-work" /> Method "GET" :> JSON Text
+  , whatAboutThis :: "what-about-this" /> Method "GET" :> JSON Text
+  } deriving (Generic)
+instance Router MyAPI
+instance Abbreviated MyAPI
+
+myAPI :: MyAPI
+myAPI = MyAPI
+  { doesItWork = brief "It works!"
+  , whatAboutThis = brief "It also works!"
+  }
+```
+
+We can nest these record routers as expected:
+
+```
+data UserAPI = UserAPI {..}
+data WidgetAPI = WidgetAPI {..}
+
+data MyAPI = MyAPI
+  { userAPI :: "user" /> UserAPI 
+  , widgetAPI :: "widget" /> WidgetAPI
+  } deriving (Generic)
+```
+
+What if we want to capture a path segment? Let's see:
+
+```
+-- newtype Capture a next = Capture {captureNext :: a -> next}
+
+data MyAPI = MyAPI
+  { echo :: "echo" /> Method "GET" :> Capture Text :> JSON Text
+  } deriving (Generic)
+instance Router MyAPI
+instance Abbreviated MyAPI
+
+myAPI :: MyAPI
+myAPI = MyAPI
+  { echo = brief id -- short for: Seg $ Method $ Capture $ \captured -> JSON captured
+  }
+```
+
+How about doing IO?
+
+```
+data MyAPI = MyAPI
+  { rng :: "rng" /> Method "GET" :> WithIO :> JSON Int
+  } deriving (Generic)
+instance Router MyAPI
+instance Abbreviated MyAPI
+
+myAPI :: MyAPI
+myAPI = MyAPI
+  { rng = brief (getStdRandom random)
+  }
+```
+
+Solga comes with a large set of useful Routers for parsing request bodies and producing responses. See the [documentation](http://chpatrick.github.io/solga/doc/solga-0.1.0.0/Solga.html) for more details.
+
+## Creating Routers
+To create a router yourself, just implement the Router typeclass:
+```
+-- | The right hand side of `Application`. `Request` is already known.
+type Responder = (Wai.Response -> IO Wai.ResponseReceived) -> IO Wai.ResponseReceived
+
+class Router r where
+  -- | Given a request, if the router supports the given request
+  -- return a function that constructs a response with a concrete router.
+  tryRoute :: Wai.Request -> Maybe (r -> Responder)
+```
+
+In Solga, all routing decisions are performed purely on the type of the Router - it's not possible to use its _value_ to decide whether to accept a request or not. This is because this way an outer router can predict whether an inner router will match, even if the value of its implementation is non-deterministic.
+
+For example, let's consider the router `CustomAuthRouter :> "foo" /> WithIO :> JSON Text`. We don't know exactly how `"foo" /> WithIO :> JSON Text` will be executed, as it contains `WithIO`. However, because of the restriction above, we can predict that it will only work for a path `/foo`. and so if we get a request with `/bar`, there's no need to do any authentication.
+
+This is why the type of `tryRoute` is `Wai.Request -> Maybe (r -> Responder)`. The router instance essentially says "I can't handle this request, try something else" or "I can handle this, please give me the implementation".
+
+For example, here is the implementation of the `JSON` router:
+
+```
+instance Aeson.ToJSON a => Router (JSON a) where
+  tryRoute _ = Just $ \json cont ->
+    cont $ Wai.responseBuilder HTTP.status200 headers $ Aeson.encodeToBuilder $ Aeson.toJSON $ jsonResponse json
+      where headers = [ ( HTTP.hContentType, "application/json" ) ]
+```
+
+`tryRouteNext` is a very useful function for implementing routers:
+```
+tryRouteNext :: Router r' => (r -> r') -> Wai.Request -> Maybe (r -> Responder)
+tryRouteNextIO :: Router r' => (r -> IO r') -> Wai.Request -> Maybe (r -> Responder)
+```
+
+Essentially, if you can convert from your type `r` to another Router type `r'`, you get the implementation for `tryRoute` for free. With this, it's easy to implement the Servant "fish operator":
+```
+data left :<|> right = (:<|>) { altLeft :: left, altRight :: right }
+  deriving (Eq, Ord, Show)
+
+infixr 1 :<|>
+
+instance (Router left, Router right) => Router (left :<|> right) where
+  tryRoute req = tryRouteNext altLeft req <|> tryRouteNext altRight req
+```
+
+Or `Seg`:
+
+```
+newtype Seg (seg :: Symbol) next = Seg { segNext :: next }
+  deriving (Eq, Ord, Show)
+
+instance (KnownSymbol seg, Router next) => Router (Seg seg next) where
+  tryRoute req = case Wai.pathInfo req of
+    s : segs | Text.unpack s == symbolVal (Proxy :: Proxy seg) ->
+      tryRouteNext segNext req { Wai.pathInfo = segs }
+    _ -> Nothing
+```
+
+## Swagger and client generation
+It is also possible to generate Swagger specifications and TypeScript clients for Solga types. This has been implemented and will be published soon. Stay tuned!