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Rewrite servant-client.

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This commit begins the reorganization of the servant-client project
    so as to allow multiple backends, and also begins some much-needed
    refactoring of the servant-client code.
This commit is contained in:
Julian K. Arni 2017-09-06 14:13:05 -07:00
parent b592b51ed8
commit 95fac329a6
15 changed files with 277 additions and 233 deletions
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5
servant-client-core/CHANGELOG.md Normal file
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@ -0,0 +1,5 @@
# Revision history for servant-client-core
## 0.11 -- YYYY-mm-dd
* First version. Released on an unsuspecting world.

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servant-client-core/LICENSE Normal file
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@ -0,0 +1,30 @@
Copyright (c) 2017, Servant Contributors
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided
with the distribution.
* Neither the name of Servant Contributors nor the names of other
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

2
servant-client-core/Setup.hs Normal file
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@ -0,0 +1,2 @@
import Distribution.Simple
main = defaultMain

8
servant-client-core/include/overlapping-compat.h Normal file
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#if __GLASGOW_HASKELL__ >= 710
#define OVERLAPPABLE_ {-# OVERLAPPABLE #-}
#define OVERLAPPING_ {-# OVERLAPPING #-}
#else
{-# LANGUAGE OverlappingInstances #-}
#define OVERLAPPABLE_
#define OVERLAPPING_
#endif

40
servant-client-core/servant-client-core.cabal Normal file
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name: servant-client-core
version: 0.11
synopsis: Core functionality and class for client function generation for servant APIs
description:
This library provides a class
license: BSD3
license-file: LICENSE
author: Servant Contributors
maintainer: haskell-servant-maintainers@googlegroups.com
homepage: http://haskell-servant.readthedocs.org/
bug-reports: http://github.com/haskell-servant/servant/issues
-- copyright:
category: Web
build-type: Simple
extra-source-files:
include/*.h
CHANGELOG.md
README.md
source-repository head
type: git
location: http://github.com/haskell-servant/servant.git
cabal-version: >=1.10
library
exposed-modules:
build-depends:
base >= 4.7 && < 4.11
, base-compat >= 0.9.1 && < 0.10
hs-source-dirs: src
default-language: Haskell2010
test-suite spec
type: exitcode-stdio-1.0
ghc-options: -Wall
default-language: Haskell2010
hs-source-dirs: test
main-is: Spec.hs
other-modules:
build-depends:
base == 4.*

6
servant-client/src/Servant/Client/Experimental/Auth.hs → servant-client-core/src/Servant/Client/Core/Internal/Auth.hs
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@ -10,7 +10,7 @@ module Servant.Client.Experimental.Auth (
, mkAuthenticateReq
) where
import Servant.Common.Req (Req)
import Servant.Common.Req (Request)
-- | For a resource protected by authentication (e.g. AuthProtect), we need
-- to provide the client with some data used to add authentication data
@ -25,12 +25,12 @@ type family AuthClientData a :: *
--
-- NOTE: THIS API IS EXPERIMENTAL AND SUBJECT TO CHANGE
newtype AuthenticateReq a =
AuthenticateReq { unAuthReq :: (AuthClientData a, AuthClientData a -> Req -> Req) }
AuthenticateReq { unAuthReq :: (AuthClientData a, AuthClientData a -> Request -> Request) }
-- | Handy helper to avoid wrapping datatypes in tuples everywhere.
--
-- NOTE: THIS API IS EXPERIMENTAL AND SUBJECT TO CHANGE
mkAuthenticateReq :: AuthClientData a
-> (AuthClientData a -> Req -> Req)
-> (AuthClientData a -> Request -> Request)
-> AuthenticateReq a
mkAuthenticateReq val func = AuthenticateReq (val, func)

0
servant-client/src/Servant/Common/BaseUrl.hs → servant-client-core/src/Servant/Client/Core/Internal/BaseUrl.hs
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4
servant-client/src/Servant/Common/BasicAuth.hs → servant-client-core/src/Servant/Client/Core/Internal/BasicAuth.hs
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@ -11,11 +11,11 @@ module Servant.Common.BasicAuth (
import Data.ByteString.Base64 (encode)
import Data.Monoid ((<>))
import Data.Text.Encoding (decodeUtf8)
import Servant.Common.Req (addHeader, Req)
import Servant.Common.Req (addHeader, Request)
import Servant.API.BasicAuth (BasicAuthData(BasicAuthData))
-- | Authenticate a request using Basic Authentication
basicAuthReq :: BasicAuthData -> Req -> Req
basicAuthReq :: BasicAuthData -> Request -> Request
basicAuthReq (BasicAuthData user pass) req =
let authText = decodeUtf8 ("Basic " <> encode (user <> ":" <> pass))
in addHeader "Authorization" authText req

13
servant-client-core/src/Servant/Client/Core/Internal/Class.hs Normal file
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@ -0,0 +1,13 @@
{-# LANGUAGE MultiParamTypeClasses #-}
{-| Types for possible backends to run client-side `Request` queries -}
module Servant.Client.Class where
import Data.Proxy
import Network.HTTP.Types
import Servant.Common.Req (Request, Response)
class (Monad m) => RunClient m ct where
runRequest :: Proxy ct
-> Method
-> Request
-> m Response

0
servant-client/src/Servant/Client/Generic.hs → servant-client-core/src/Servant/Client/Core/Internal/Generic.hs
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146
servant-client-core/src/Servant/Client/Core/Internal/Request.hs Normal file
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@ -0,0 +1,146 @@
{-# LANGUAGE CPP #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeFamilies #-}
module Servant.Common.Request where
import Prelude ()
import Prelude.Compat
import qualified Data.ByteString.Builder as Builder
import qualified Data.ByteString.Lazy as LBS
import Data.Semigroup ((<>))
import qualified Data.Sequence as Seq
import Data.String.Conversions (cs)
import Data.Text (Text)
import Data.Typeable (Typeable)
import GHC.Generics (Generic)
import Network.HTTP.Media (MediaType)
import Network.HTTP.Types (Header, HeaderName, HttpVersion,
Method, QueryItem, Status, http11)
import Web.HttpApiData (ToHttpApiData, toEncodedUrlPiece,
toHeader)
data ServantError
= FailureResponse Response
| DecodeFailure Text Response
| UnsupportedContentType MediaType Response
| InvalidContentTypeHeader Response
| ConnectionError Text
deriving (Eq, Show, Generic, Typeable)
data Request = Request
{ requestPath :: Builder.Builder
, requestQueryString :: Seq.Seq QueryItem
, requestBody :: Maybe (RequestBody, MediaType)
, requestAccept :: Seq.Seq MediaType
, requestHeaders :: Seq.Seq Header
, requestHttpVersion :: HttpVersion
} deriving (Generic, Typeable)
newtype RequestBody = RequestBodyLBS LBS.ByteString
deriving (Eq, Ord, Read, Show, Typeable)
data Response = Response
{ responseStatusCode :: Status
, responseBody :: LBS.ByteString
, responseHeaders :: Seq.Seq Header
, responseHttpVersion :: HttpVersion
} deriving (Eq, Show, Generic, Typeable)
defaultRequest :: Request
defaultRequest = Request
{ requestPath = ""
, requestQueryString = Seq.empty
, requestBody = Nothing
, requestAccept = Seq.empty
, requestHeaders = Seq.empty
, requestHttpVersion = http11
}
appendToPath :: Text -> Request -> Request
appendToPath p req
= req { requestPath = requestPath req <> "/" <> toEncodedUrlPiece p }
{-appendToQueryString :: Text -- ^ param name-}
{--> Maybe Text -- ^ param value-}
{--> Request-}
{--> Request-}
{-appendToQueryString pname pvalue req-}
{-= req { requestQueryString = requestQueryString req Seq.|> (pname, pvalue)}-}
addHeader :: ToHttpApiData a => HeaderName -> a -> Request -> Request
addHeader name val req
= req { requestHeaders = requestHeaders req Seq.|> (name, toHeader val)}
-- | Set body and media type of the request being constructed.
--
-- The body is set to the given bytestring using the 'RequestBodyLBS'
-- constructor.
--
-- @since 0.12
--
setRequestBodyLBS :: LBS.ByteString -> MediaType -> Request -> Request
setRequestBodyLBS b t req
= req { requestBody = Just (RequestBodyLBS b, t) }
-- | Set body and media type of the request being constructed.
--
-- @since 0.12
--
setRequestBody :: RequestBody -> MediaType -> Request -> Request
setRequestBody b t req = req { requestBody = Just (b, t) }
{-reqToRequest :: (Functor m, MonadThrow m) => Req -> BaseUrl -> m Request-}
{-reqToRequest req (BaseUrl reqScheme reqHost reqPort path) =-}
{-setheaders . setAccept . setrqb . setQS <$> parseRequest url-}
{-where url = show $ nullURI { uriScheme = case reqScheme of-}
{-Http -> "http:"-}
{-Https -> "https:"-}
{-, uriAuthority = Just $-}
{-URIAuth { uriUserInfo = ""-}
{-, uriRegName = reqHost-}
{-, uriPort = ":" ++ show reqPort-}
{-}-}
{-, uriPath = fullPath-}
{-}-}
{-fullPath = path ++ cs (Builder.toLazyByteString (reqPath req))-}
{-setrqb r = case reqBody req of-}
{-Nothing -> r-}
{-Just (b,t) -> r { requestBody = b-}
{-, requestHeaders = requestHeaders r-}
{-++ [(hContentType, cs . show $ t)] }-}
{-setQS = setQueryString $ queryTextToQuery (qs req)-}
{-setheaders r = r { requestHeaders = requestHeaders r-}
{-<> fmap toProperHeader (headers req) }-}
{-setAccept r = r { requestHeaders = filter ((/= "Accept") . fst) (requestHeaders r)-}
{-<> [("Accept", renderHeader $ reqAccept req)-}
{-| not . null . reqAccept $ req] }-}
{-toProperHeader (name, val) =-}
{-(fromString name, encodeUtf8 val)-}
#if !MIN_VERSION_http_client(0,4,30)
-- 'parseRequest' is introduced in http-client-0.4.30
-- it differs from 'parseUrl', by not throwing exceptions on non-2xx http statuses
--
-- See for implementations:
-- http://hackage.haskell.org/package/http-client-0.4.30/docs/src/Network-HTTP-Client-Request.html#parseRequest
-- http://hackage.haskell.org/package/http-client-0.5.0/docs/src/Network-HTTP-Client-Request.html#parseRequest
parseRequest :: MonadThrow m => String -> m Request
parseRequest url = liftM disableStatusCheck (parseUrl url)
where
disableStatusCheck req = req { checkStatus = \ _status _headers _cookies -> Nothing }
#endif
-- * performing requests
displayHttpRequest :: Method -> String
displayHttpRequest httpmethod = "HTTP " ++ cs httpmethod ++ " request"

1
servant-client/servant-client.cabal
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@ -44,6 +44,7 @@ library
, attoparsec >= 0.12 && < 0.14
, base64-bytestring >= 1.0.0.1 && < 1.1
, bytestring >= 0.10 && < 0.11
, containers >= 0.5 && < 0.6
, exceptions >= 0.8 && < 0.9
, generics-sop >= 0.1.0.0 && < 0.4
, http-api-data >= 0.3.6 && < 0.4

15
servant-client/src/Servant/Client/Class.hs
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@ -1,15 +0,0 @@
{-# LANGUAGE MultiParamTypeClasses #-}
{-| Types for possible backends to run client-side `Req` queries -}
module Servant.Client.Class
(RunClient(..))
where
import Data.Proxy
import Network.HTTP.Types
import Servant.Common.Req
class (Monad m) => RunClient m ct result where
runRequest :: Proxy ct
-> Method
-> Req
-> m result

57
servant-client/src/Servant/Client/HttpClient.hs
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@ -4,44 +4,42 @@
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeFamilies #-}
{-| http-client based client requests executor -}
module Servant.Client.HttpClient where
import Prelude ()
import Prelude.Compat
import Prelude ()
import Prelude.Compat
import Control.Exception
import Control.Monad
import Control.Monad.Catch (MonadThrow, MonadCatch)
import Data.Foldable (toList)
import Data.Functor.Alt (Alt (..))
import Control.Exception
import Control.Monad
import Control.Monad.Base (MonadBase (..))
import Control.Monad.Catch (MonadCatch, MonadThrow)
import Control.Monad.Error.Class (MonadError (..))
import Control.Monad.IO.Class ()
import Control.Monad.Reader
import Control.Monad.Trans.Control (MonadBaseControl (..))
import Control.Monad.Trans.Except
import Data.ByteString.Lazy hiding (any, elem, filter, map,
null, pack)
import Data.Foldable (toList)
import Data.Functor.Alt (Alt (..))
import Data.Proxy
import Data.String.Conversions (cs)
import GHC.Generics
import Network.HTTP.Media
import Network.HTTP.Types
import Servant.API.ContentTypes
import Servant.Client.Class
import Servant.Common.BaseUrl
import Servant.Common.Req
import Control.Monad.Error.Class (MonadError(..))
import Control.Monad.Trans.Except
import GHC.Generics
import Control.Monad.Base (MonadBase (..))
import Control.Monad.IO.Class ()
import Control.Monad.Reader
import Control.Monad.Trans.Control (MonadBaseControl (..))
import Data.ByteString.Lazy hiding (pack, filter, map, null, elem, any)
import Data.String.Conversions (cs)
import Data.Proxy
import Network.HTTP.Media
import Network.HTTP.Types
import Network.HTTP.Client hiding (Proxy, path)
import qualified Network.HTTP.Client as Client
import qualified Network.HTTP.Types.Header as HTTP
import Servant.API.ContentTypes
import Servant.Client.Class
import Servant.Common.BaseUrl
import Servant.Common.Req
import qualified Network.HTTP.Client as Client
instance RunClient ClientM NoContent ( Int, ByteString, MediaType
, [HTTP.Header], Response ByteString) where
@ -89,8 +87,7 @@ runClientM cm env = runExceptT $ (flip runReaderT env) $ runClientM' cm
performRequest :: Method -> Req
-> ClientM ( Int, ByteString, MediaType
, [HTTP.Header], Response ByteString)
-> ClientM Response
performRequest reqMethod req = do
m <- asks manager
reqHost <- asks baseUrl

183
servant-client/src/Servant/Common/Req.hs
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@ -1,183 +0,0 @@
{-# LANGUAGE CPP #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
module Servant.Common.Req where
import Prelude ()
import Prelude.Compat
import Control.Exception
import Control.Monad.Catch (MonadThrow)
import Data.Semigroup ((<>))
import Control.Monad.IO.Class ()
import qualified Data.ByteString.Builder as BS
import Data.ByteString.Lazy hiding (pack, filter, map, null, elem, any)
import Data.String
import Data.String.Conversions (cs)
import Data.Text (Text)
import Data.Text.Encoding
import Data.Typeable
import Network.HTTP.Media
import Network.HTTP.Types
import Network.HTTP.Client hiding (Proxy, path)
import Network.URI hiding (path)
import Servant.Common.BaseUrl
import Web.HttpApiData
data ServantError
= FailureResponse
{ failingRequest :: UrlReq
, responseStatus :: Status
, responseContentType :: MediaType
, responseBody :: ByteString
}
| DecodeFailure
{ decodeError :: String
, responseContentType :: MediaType
, responseBody :: ByteString
}
| UnsupportedContentType
{ responseContentType :: MediaType
, responseBody :: ByteString
}
| InvalidContentTypeHeader
{ responseContentTypeHeader :: ByteString
, responseBody :: ByteString
}
| ConnectionError
{ connectionError :: SomeException
}
deriving (Show, Typeable)
instance Eq ServantError where
FailureResponse _ a b c == FailureResponse _ x y z =
(a, b, c) == (x, y, z)
DecodeFailure a b c == DecodeFailure x y z =
(a, b, c) == (x, y, z)
UnsupportedContentType a b == UnsupportedContentType x y =
(a, b) == (x, y)
InvalidContentTypeHeader a b == InvalidContentTypeHeader x y =
(a, b) == (x, y)
ConnectionError a == ConnectionError x =
show a == show x
_ == _ = False
instance Exception ServantError
data UrlReq = UrlReq BaseUrl Req
instance Show UrlReq where
show (UrlReq url req) = showBaseUrl url ++ path ++ "?" ++ show (qs req)
where
path = cs (BS.toLazyByteString (reqPath req))
data Req = Req
{ reqPath :: BS.Builder
, qs :: QueryText
, reqBody :: Maybe (RequestBody, MediaType)
, reqAccept :: [MediaType]
, headers :: [(String, Text)]
}
defReq :: Req
defReq = Req "" [] Nothing [] []
appendToPath :: String -> Req -> Req
appendToPath p req =
req { reqPath = reqPath req <> "/" <> toEncodedUrlPiece p }
appendToQueryString :: Text -- ^ param name
-> Maybe Text -- ^ param value
-> Req
-> Req
appendToQueryString pname pvalue req =
req { qs = qs req ++ [(pname, pvalue)]
}
addHeader :: ToHttpApiData a => String -> a -> Req -> Req
addHeader name val req = req { headers = headers req
++ [(name, decodeUtf8 (toHeader val))]
}
-- | Set body and media type of the request being constructed.
--
-- The body is set to the given bytestring using the 'RequestBodyLBS'
-- constructor.
--
{-# DEPRECATED setRQBody "Use setReqBodyLBS instead" #-}
setRQBody :: ByteString -> MediaType -> Req -> Req
setRQBody = setReqBodyLBS
-- | Set body and media type of the request being constructed.
--
-- The body is set to the given bytestring using the 'RequestBodyLBS'
-- constructor.
--
-- @since 0.9.2.0
--
setReqBodyLBS :: ByteString -> MediaType -> Req -> Req
setReqBodyLBS b t req = req { reqBody = Just (RequestBodyLBS b, t) }
-- | Set body and media type of the request being constructed.
--
-- @since 0.9.2.0
--
setReqBody :: RequestBody -> MediaType -> Req -> Req
setReqBody b t req = req { reqBody = Just (b, t) }
reqToRequest :: (Functor m, MonadThrow m) => Req -> BaseUrl -> m Request
reqToRequest req (BaseUrl reqScheme reqHost reqPort path) =
setheaders . setAccept . setrqb . setQS <$> parseRequest url
where url = show $ nullURI { uriScheme = case reqScheme of
Http -> "http:"
Https -> "https:"
, uriAuthority = Just $
URIAuth { uriUserInfo = ""
, uriRegName = reqHost
, uriPort = ":" ++ show reqPort
}
, uriPath = fullPath
}
fullPath = path ++ cs (BS.toLazyByteString (reqPath req))
setrqb r = case reqBody req of
Nothing -> r
Just (b,t) -> r { requestBody = b
, requestHeaders = requestHeaders r
++ [(hContentType, cs . show $ t)] }
setQS = setQueryString $ queryTextToQuery (qs req)
setheaders r = r { requestHeaders = requestHeaders r
<> fmap toProperHeader (headers req) }
setAccept r = r { requestHeaders = filter ((/= "Accept") . fst) (requestHeaders r)
<> [("Accept", renderHeader $ reqAccept req)
| not . null . reqAccept $ req] }
toProperHeader (name, val) =
(fromString name, encodeUtf8 val)
#if !MIN_VERSION_http_client(0,4,30)
-- 'parseRequest' is introduced in http-client-0.4.30
-- it differs from 'parseUrl', by not throwing exceptions on non-2xx http statuses
--
-- See for implementations:
-- http://hackage.haskell.org/package/http-client-0.4.30/docs/src/Network-HTTP-Client-Request.html#parseRequest
-- http://hackage.haskell.org/package/http-client-0.5.0/docs/src/Network-HTTP-Client-Request.html#parseRequest
parseRequest :: MonadThrow m => String -> m Request
parseRequest url = liftM disableStatusCheck (parseUrl url)
where
disableStatusCheck req = req { checkStatus = \ _status _headers _cookies -> Nothing }
#endif
-- * performing requests
displayHttpRequest :: Method -> String
displayHttpRequest httpmethod = "HTTP " ++ cs httpmethod ++ " request"