mirror of
https://github.com/unclechu/gRPC-haskell.git
synced 2024-11-14 23:29:42 +01:00
82 lines
3.2 KiB
Haskell
82 lines
3.2 KiB
Haskell
{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE DeriveGeneric #-}
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{-# LANGUAGE LambdaCase #-}
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{-# LANGUAGE OverloadedLists #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE RecordWildCards #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# OPTIONS_GHC -fno-warn-missing-signatures #-}
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{-# OPTIONS_GHC -fno-warn-unused-binds #-}
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import Control.Monad
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import Data.Function (fix)
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import qualified Data.Text as T
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import Data.Word
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import GHC.Generics (Generic)
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import Network.GRPC.HighLevel.Server
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import qualified Network.GRPC.HighLevel.Server.Unregistered as U
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import Network.GRPC.LowLevel
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import Proto3.Suite.Class
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serverMeta :: MetadataMap
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serverMeta = [("test_meta", "test_meta_value")]
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data SSRqt = SSRqt { ssName :: T.Text, ssNumReplies :: Word32 } deriving (Show, Eq, Ord, Generic)
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instance Message SSRqt
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data SSRpy = SSRpy { ssGreeting :: T.Text } deriving (Show, Eq, Ord, Generic)
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instance Message SSRpy
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data CSRqt = CSRqt { csMessage :: T.Text } deriving (Show, Eq, Ord, Generic)
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instance Message CSRqt
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data CSRpy = CSRpy { csNumRequests :: Word32 } deriving (Show, Eq, Ord, Generic)
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instance Message CSRpy
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data BiRqtRpy = BiRqtRpy { biMessage :: T.Text } deriving (Show, Eq, Ord, Generic)
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instance Message BiRqtRpy
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expect :: (Eq a, MonadFail m, Show a) => String -> a -> a -> m ()
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expect ctx ex got
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| ex /= got = fail $ ctx ++ " error: expected " ++ show ex ++ ", got " ++ show got
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| otherwise = return ()
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helloSS :: Handler 'ServerStreaming
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helloSS = ServerStreamHandler "/hellos.Hellos/HelloSS" $ \sc send -> do
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let SSRqt{..} = payload sc
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replicateM_ (fromIntegral ssNumReplies) $ do
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eea <- send $ SSRpy $ "Hello there, " <> ssName <> "!"
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case eea of
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Left e -> fail $ "helloSS error: " ++ show e
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Right{} -> return ()
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return (serverMeta, StatusOk, StatusDetails "helloSS response details")
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helloCS :: Handler 'ClientStreaming
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helloCS = ClientStreamHandler "/hellos.Hellos/HelloCS" $ \_ recv -> flip fix 0 $ \go n ->
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recv >>= \case
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Left e -> fail $ "helloCS error: " ++ show e
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Right Nothing -> return (Just (CSRpy n), mempty, StatusOk, StatusDetails "helloCS details")
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Right (Just rqt) -> do
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expect "helloCS" "client streaming payload" (csMessage rqt)
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go (n+1)
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helloBi :: Handler 'BiDiStreaming
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helloBi = BiDiStreamHandler "/hellos.Hellos/HelloBi" $ \_ recv send -> fix $ \go ->
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recv >>= \case
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Left e -> fail $ "helloBi recv error: " ++ show e
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Right Nothing -> return (mempty, StatusOk, StatusDetails "helloBi details")
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Right (Just rqt) -> do
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expect "helloBi" "bidi payload" (biMessage rqt)
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send rqt >>= \case
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Left e -> fail $ "helloBi send error: " ++ show e
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_ -> go
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highlevelMainUnregistered :: IO ()
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highlevelMainUnregistered =
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U.serverLoop defaultOptions{
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optServerStreamHandlers = [helloSS]
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, optClientStreamHandlers = [helloCS]
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, optBiDiStreamHandlers = [helloBi]
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}
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main :: IO ()
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main = highlevelMainUnregistered
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defConfig :: ServerConfig
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defConfig = ServerConfig "localhost" 50051 [] [] [] [] [] Nothing
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