servant/servant-client
Oleg Grenrus 0b084afe62 Update .travis.yml
- Disable file-upload recipe (changed MkLink breaks released
  servant-multipart)
- GHC-8.4.2 -> GHC-8.4.3
2018-06-01 13:42:34 +03:00
..
include less OverlappingInstances noise 2016-01-04 13:09:11 -05:00
src/Servant document hoistClient (haddocks, tutorial) 2018-04-04 01:48:48 +02:00
test Merge pull request #959 from jvanbruegge/fix-stream 2018-05-28 09:26:53 +03:00
CHANGELOG.md Bump servant-client version 2018-04-11 11:28:33 +03:00
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README.lhs servant-client: update README.md and test it 2018-04-18 14:18:41 +01:00
README.md servant-client: update README.md and test it 2018-04-18 14:18:41 +01:00
servant-client.cabal Update .travis.yml 2018-06-01 13:42:34 +03:00
Setup.hs stylish haskell changes 2015-08-18 00:07:12 +02:00
tinc.yaml Use tinc on travis 2015-11-05 09:32:13 +08:00

servant-client

servant

This library lets you automatically derive Haskell functions that let you query each endpoint of a servant webservice.

Example

{-# LANGUAGE DataKinds #-}
{-# LANGUAGE TypeOperators #-}

import Data.Proxy
import Data.Text
import Network.HTTP.Client (newManager, defaultManagerSettings)
import Servant.API
import Servant.Client


type Book = Text

type MyApi = "books" :> Get '[JSON] [Book] -- GET /books
        :<|> "books" :> ReqBody '[JSON] Book :> Post '[JSON] Book -- POST /books

myApi :: Proxy MyApi
myApi = Proxy

-- 'client' allows you to produce operations to query an API from a client.
postNewBook :: Book -> ClientM Book
getAllBooks :: ClientM [Book]
(getAllBooks :<|> postNewBook) = client myApi


main :: IO ()
main = do
  manager' <- newManager defaultManagerSettings
  res <- runClientM getAllBooks (mkClientEnv manager' (BaseUrl Http "localhost" 8081 ""))
  case res of
    Left err -> putStrLn $ "Error: " ++ show err
    Right books -> print books