servant-client-0.16: Automatic derivation of querying functions for servant

Safe HaskellNone
LanguageHaskell2010

Servant.Client

Description

This module provides client which can automatically generate querying functions for each endpoint just from the type representing your API.

Synopsis

Documentation

client :: HasClient ClientM api => Proxy api -> Client ClientM api Source #

Generates a set of client functions for an API.

Example:

type API = Capture "no" Int :> Get '[JSON] Int
       :<|> Get '[JSON] [Bool]

api :: Proxy API
api = Proxy

getInt :: Int -> ClientM Int
getBools :: ClientM [Bool]
getInt :<|> getBools = client api

data ClientM a Source #

ClientM is the monad in which client functions run. Contains the Manager and BaseUrl used for requests in the reader environment.

Instances
Monad ClientM Source # 
Instance details

Defined in Servant.Client.Internal.HttpClient

Methods

(>>=) :: ClientM a -> (a -> ClientM b) -> ClientM b #

(>>) :: ClientM a -> ClientM b -> ClientM b #

return :: a -> ClientM a #

fail :: String -> ClientM a #

Functor ClientM Source # 
Instance details

Defined in Servant.Client.Internal.HttpClient

Methods

fmap :: (a -> b) -> ClientM a -> ClientM b #

(<$) :: a -> ClientM b -> ClientM a #

Applicative ClientM Source # 
Instance details

Defined in Servant.Client.Internal.HttpClient

Methods

pure :: a -> ClientM a #

(<*>) :: ClientM (a -> b) -> ClientM a -> ClientM b #

liftA2 :: (a -> b -> c) -> ClientM a -> ClientM b -> ClientM c #

(*>) :: ClientM a -> ClientM b -> ClientM b #

(<*) :: ClientM a -> ClientM b -> ClientM a #

MonadIO ClientM Source # 
Instance details

Defined in Servant.Client.Internal.HttpClient

Methods

liftIO :: IO a -> ClientM a #

MonadThrow ClientM Source # 
Instance details

Defined in Servant.Client.Internal.HttpClient

Methods

throwM :: Exception e => e -> ClientM a #

MonadCatch ClientM Source # 
Instance details

Defined in Servant.Client.Internal.HttpClient

Methods

catch :: Exception e => ClientM a -> (e -> ClientM a) -> ClientM a #

Alt ClientM Source #

Try clients in order, last error is preserved.

Instance details

Defined in Servant.Client.Internal.HttpClient

RunClient ClientM Source # 
Instance details

Defined in Servant.Client.Internal.HttpClient

MonadReader ClientEnv ClientM Source # 
Instance details

Defined in Servant.Client.Internal.HttpClient

Methods

ask :: ClientM ClientEnv #

local :: (ClientEnv -> ClientEnv) -> ClientM a -> ClientM a #

reader :: (ClientEnv -> a) -> ClientM a #

MonadBase IO ClientM Source # 
Instance details

Defined in Servant.Client.Internal.HttpClient

Methods

liftBase :: IO α -> ClientM α #

MonadBaseControl IO ClientM Source # 
Instance details

Defined in Servant.Client.Internal.HttpClient

Associated Types

type StM ClientM a :: Type #

MonadError ClientError ClientM Source # 
Instance details

Defined in Servant.Client.Internal.HttpClient

Generic (ClientM a) Source # 
Instance details

Defined in Servant.Client.Internal.HttpClient

Associated Types

type Rep (ClientM a) :: Type -> Type #

Methods

from :: ClientM a -> Rep (ClientM a) x #

to :: Rep (ClientM a) x -> ClientM a #

type StM ClientM a Source # 
Instance details

Defined in Servant.Client.Internal.HttpClient

type Rep (ClientM a) Source # 
Instance details

Defined in Servant.Client.Internal.HttpClient

type Rep (ClientM a) = D1 (MetaData "ClientM" "Servant.Client.Internal.HttpClient" "servant-client-0.16-IDJGPnaEvR65TDLv4yVNFZ" True) (C1 (MetaCons "ClientM" PrefixI True) (S1 (MetaSel (Just "unClientM") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 (ReaderT ClientEnv (ExceptT ClientError IO) a))))

data ClientEnv Source #

The environment in which a request is run.

hoistClient :: HasClient ClientM api => Proxy api -> (forall a. m a -> n a) -> Client m api -> Client n api Source #

Change the monad the client functions live in, by supplying a conversion function (a natural transformation to be precise).

For example, assuming you have some manager :: Manager and baseurl :: BaseUrl around:

type API = Get '[JSON] Int :<|> Capture "n" Int :> Post '[JSON] Int
api :: Proxy API
api = Proxy
getInt :: IO Int
postInt :: Int -> IO Int
getInt :<|> postInt = hoistClient api (flip runClientM cenv) (client api)
  where cenv = mkClientEnv manager baseurl