| Safe Haskell | None |
|---|---|
| Language | Haskell2010 |
Servant.Server.Internal.Router
- type Router env = Router' env RoutingApplication
- data Router' env a
- = StaticRouter (Map Text (Router' env a)) [env -> a]
- | CaptureRouter (Router' (Text, env) a)
- | CaptureAllRouter (Router' ([Text], env) a)
- | RawRouter (env -> a)
- | Choice (Router' env a) (Router' env a)
- pathRouter :: Text -> Router' env a -> Router' env a
- leafRouter :: (env -> a) -> Router' env a
- choice :: Router' env a -> Router' env a -> Router' env a
- data RouterStructure
- routerStructure :: Router' env a -> RouterStructure
- sameStructure :: Router' env a -> Router' env b -> Bool
- routerLayout :: Router' env a -> Text
- tweakResponse :: (RouteResult Response -> RouteResult Response) -> Router env -> Router env
- runRouter :: Router () -> RoutingApplication
- runRouterEnv :: Router env -> env -> RoutingApplication
- runChoice :: [env -> RoutingApplication] -> env -> RoutingApplication
- worseHTTPCode :: Int -> Int -> Bool
Documentation
type Router env = Router' env RoutingApplication Source #
Internal representation of a router.
The first argument describes an environment type that is expected as extra input by the routers at the leaves. The environment is filled while running the router, with path components that can be used to process captures.
Constructors
| StaticRouter (Map Text (Router' env a)) [env -> a] | the map contains routers for subpaths (first path component used for lookup and removed afterwards), the list contains handlers for the empty path, to be tried in order |
| CaptureRouter (Router' (Text, env) a) | first path component is passed to the child router in its environment and removed afterwards |
| CaptureAllRouter (Router' ([Text], env) a) | all path components are passed to the child router in its environment and are removed afterwards |
| RawRouter (env -> a) | to be used for routes we do not know anything about |
| Choice (Router' env a) (Router' env a) | left-biased choice between two routers |
pathRouter :: Text -> Router' env a -> Router' env a Source #
Smart constructor for a single static path component.
leafRouter :: (env -> a) -> Router' env a Source #
Smart constructor for a leaf, i.e., a router that expects the empty path.
choice :: Router' env a -> Router' env a -> Router' env a Source #
Smart constructor for the choice between routers. We currently optimize the following cases:
- Two static routers can be joined by joining their maps and concatenating their leaf-lists.
- Two dynamic routers can be joined by joining their codomains.
- Choice nodes can be reordered.
data RouterStructure Source #
Datatype used for representing and debugging the structure of a router. Abstracts from the handlers at the leaves.
Two Routers can be structurally compared by computing
their RouterStructure using routerStructure and
then testing for equality, see sameStructure.
Constructors
| StaticRouterStructure (Map Text RouterStructure) Int | |
| CaptureRouterStructure RouterStructure | |
| RawRouterStructure | |
| ChoiceStructure RouterStructure RouterStructure |
Instances
routerStructure :: Router' env a -> RouterStructure Source #
Compute the structure of a router.
Assumes that the request or text being passed
in WithRequest or CaptureRouter does not
affect the structure of the underlying tree.
sameStructure :: Router' env a -> Router' env b -> Bool Source #
Compare the structure of two routers.
routerLayout :: Router' env a -> Text Source #
Provide a textual representation of the structure of a router.
tweakResponse :: (RouteResult Response -> RouteResult Response) -> Router env -> Router env Source #
Apply a transformation to the response of a Router.
runRouter :: Router () -> RoutingApplication Source #
Interpret a router as an application.
runRouterEnv :: Router env -> env -> RoutingApplication Source #
runChoice :: [env -> RoutingApplication] -> env -> RoutingApplication Source #
Try a list of routing applications in order. We stop as soon as one fails fatally or succeeds. If all fail normally, we pick the "best" error.