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{-# OPTIONS_GHC -fno-warn-incomplete-patterns #-}
module Api
( fetchSchema,
fetchSchemaVersion,
fetchPosts,
fetchPost,
updatePost,
)
where
#ifndef ghcjs_HOST_OS
import Data.String
import Network.HTTP.Simple
#else
import Data.ByteString.Char8 qualified as B
import Data.Maybe
import Data.String
import JavaScript.Web.XMLHttpRequest
import Miso.String qualified as J
#endif
import Data.Aeson qualified as A
import Data.ByteString.Lazy.Char8 qualified as LB
import Data.ByteString.Lazy.UTF8 qualified as LB
import Data.Function
import Miso
import Safe
import Schema
import Version
fetchSchema :: JSM (Either String Schema)
fetchSchema =
A.eitherDecode <$> fetch (fromString "http://localhost:8081/posts.schema.json")
fetchSchemaVersion :: JSM (Either String Version)
fetchSchemaVersion =
A.eitherDecode <$> fetch (fromString "http://localhost:8081/schemaVersion")
fetchPosts :: JSM (Either String [A.Value])
fetchPosts =
A.eitherDecode
<$> fetch
( fromString "http://localhost:8081"
& setRequestMethod "POST"
& setRequestBodyLBS "SELECT posts FROM posts"
)
fetchPost :: String -> JSM (Either String (Maybe A.Value))
fetchPost fileName =
fmap headMay . A.eitherDecode
<$> fetch
( fromString "http://localhost:8081"
& setRequestMethod "POST"
& setRequestBodyLBS ("SELECT posts FROM posts WHERE posts.$fileName == \"" <> LB.fromString fileName <> "\"")
)
updatePost :: String -> A.Value -> JSM (Either String ())
updatePost fileName value =
A.eitherDecode
<$> fetch
( fromString "http://localhost:8081"
& setRequestMethod "POST"
& setRequestBodyLBS ("UPDATE posts SET " <> A.encode value <> " WHERE posts.$fileName == \"" <> LB.fromString fileName <> "\"")
)
fetch :: Request -> JSM LB.ByteString
fetch req = LB.fromStrict . getResponseBody <$> httpBS req
#ifdef ghcjs_HOST_OS
httpBS :: Request -> JSM (Response B.ByteString)
httpBS req = xhrByteString req
instance IsString Request where
fromString uri =
Request
{ reqMethod = GET,
reqURI = J.pack uri,
reqLogin = Nothing,
reqHeaders = [],
reqWithCredentials = False,
reqData = NoData
}
setRequestMethod :: B.ByteString -> Request -> Request
setRequestMethod "POST" req = req {reqMethod = POST}
setRequestBodyLBS :: LB.ByteString -> Request -> Request
setRequestBodyLBS body req = req {reqData = StringData (J.pack (LB.unpack body))}
getResponseBody :: Response B.ByteString -> B.ByteString
getResponseBody = fromMaybe "" . contents
#endif
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