servant-http-streams
Automatic derivation of querying functions for servant
| LTS Haskell 20.23: | 0.18.4@rev:6 |
| Stackage Nightly 2023-06-04: | 0.18.4@rev:6 |
| Latest on Hackage: | 0.18.4@rev:6 |
Maintained by haskell-servant-maintainers@googlegroups.com
This version can be pinned in stack with:
servant-http-streams-0.18.4@sha256:50d2df3c4178f950fc091009790ff53dd43d1cfacf59149d088bd32058eb20db,4493Module documentation for 0.18.4
Depends on 23 packages(full list with versions):
servant-client
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 Servant.API
import Servant.HttpStreams
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
-- the IOException happens already in withClientEnvIO
main' :: IO ()
main' = do
let burl = BaseUrl Http "localhost" 8081 ""
withClientEnvIO burl $ \env -> do
res <- runClientM getAllBooks env
case res of
Left err -> putStrLn $ "Error: " ++ show err
Right books -> print books
main :: IO ()
main = return ()