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Changelog.markdowndeleted−4

since splitsnapshots

unifiedsplit

@@ -1,4 +0,0 @@

1−# v0.1 (2020-12-27)

2−

3−* initial release to support [Project:M36](https://github.com/agentm/project-m36)

4−

README.markdown+3−69

@@ -1,78 +1,12 @@

1# Curryer - Fast Haskell-to-Haskell RPC

3−Curryer (pun intended) is a fast, Haskell-exclusive RPC (remote procedure call) library. By using the latest Haskell serialization and streaming libraries, curryer aims to be the fastest and easiest means of communicating between Haskell-based processes.

3+Curryer (pun intended) is a fast, Haskell-exclusive RPC (remote procedure call) library. By using the latest Haskell serialization and streaming libraries, curryer aims to the fastest and easiest means of communicating between Haskell-based processes.

5−Curryer is inspired by the now unmaintained [distributed-process](https://hackage.haskell.org/package/distributed-process) library, but is lighter-weight and uses a higher-performance serialization package.

5+Curryer is inspired by the now unmaintained [distributed-process](https://hackage.haskell.org/package/distributed-process) library.

7## Features

9* blocking and non-blocking remote function calls

10* asynchronous server-to-client callbacks (for server-initiated notifications)

11* timeouts

12−* leverages [winery](https://hackage.haskell.org/package/winery) for high-performance serialization

12+* utilizes versionable shared ADT instead of shared function `StaticPtr`s

13−

14−## Requirements

15−

16−* GHC 8.6+

17−

18−## Code Example

19−

20−[Server](https://github.com/agentm/curryer/examples/SimpleKeyValueServer.hs):

21−

22−```haskell

23−data SetKey = SetKey String String

24− deriving (Generic, Show)

25− deriving Serialise via WineryVariant SetKey

26−

27−data GetKey = GetKey String

28− deriving (Generic, Show)

29− deriving Serialise via WineryVariant GetKey

30−

31−main :: IO ()

32−main = do

33− kvmap <- M.newIO

34− void $ serve kvRequestHandlers kvmap localHostAddr 8765 Nothing

35−

36−kvRequestHandlers :: RequestHandlers (M.Map String String)

37−kvRequestHandlers = [ RequestHandler $ \state (SetKey k v) ->

38− atomically $ M.insert v k (connectionServerState state)

39− , RequestHandler $ \state (GetKey k) ->

40− atomically $ M.lookup k (connectionServerState state)

41− ]

42−```

43−

44−[Client](https://github.com/agentm/curryer/examples/SimpleKeyValueClient.hs):

45−

46−```haskell

47−data SetKey = SetKey String String

48− deriving (Generic, Show)

49− deriving Serialise via WineryVariant SetKey

50−

51−data GetKey = GetKey String

52− deriving (Generic, Show)

53− deriving Serialise via WineryVariant GetKey

54−

55−data CommandOptions = Get {name :: String}

56− | Set {name :: String, value :: String}

57− deriving (Generic, Show)

58−

59−instance ParseRecord CommandOptions

60−

61−main :: IO ()

62−main = do

63− opts <- getRecord "SimpleKeyValueClient"

64− conn <- connect [] localHostAddr 8765

65− case opts of

66− Get k -> do

67− eRet <- call conn (GetKey k)

68− case eRet of

69− Left err -> error (show err)

70− Right (Just val) -> putStrLn val

71− Right Nothing -> error "no such key"

72− Set k v -> do

73− eRet <- call conn (SetKey k v)

74− case eRet of

75− Left err -> error (show err)

76− Right () -> pure ()

77−

78−```

bench/Basic.hs+21−25

@@ -15,10 +15,10 @@ main :: IO ()

15main = do

16 --start server shared across benchmarks- gather stats on round-trip requests-responses

17 portReadyMVar <- newEmptyMVar

18− server <- async (serve benchmarkServerRequestHandlers () localHostAddr 0 (Just portReadyMVar))

18+ server <- async (serve (pure Nothing) benchmarkServerMessageHandler localHostAddr 0 (Just portReadyMVar))

19 --wait for server to be ready

20 (SockAddrInet port _) <- takeMVar portReadyMVar

21− clientConn <- connect [] localHostAddr port

21+ clientConn <- connect (const (pure ())) localHostAddr port

23 _ <- syncWaitRequest clientConn 100

24 let syncWait ms = nfIO (syncWaitRequest clientConn ms)

@@ -30,10 +30,10 @@ main = do

30 defaultMain [bgroup "wait sync" [bench "0 ms" (syncWait 0),

31 bench "10 ms" (syncWait 10),

32 bench "100 ms" (syncWait 100)],

33− bgroup "bytestring roundtrip" [bench "0 bytes" (syncByteString bs0)

33+ bgroup "bytestring roundtrip" [bench "0 bytes" (syncByteString bs0),

34− ,bench "100 bytes" (syncByteString bs100)

34+ bench "100 bytes" (syncByteString bs100),

35− ,bench "1000 bytes" (syncByteString bs1000)

35+ bench "1000 bytes" (syncByteString bs1000),

36− ,bench "1000000 bytes" (syncByteString bs1M)

36+ bench "1000000 bytes" (syncByteString bs1M)

37 ]]

39 --TODO: bench for > PIPE_BUF bytes

@@ -41,38 +41,34 @@ main = do

41 close clientConn

42 cancel server

44−data WaitMillisecondsReq = WaitMillisecondsReq Int --ask the server to respond in X milliseconds

44+data BenchRequest = WaitMillisecondsReq Int --ask the server to respond in X milliseconds

45+ | WaitByteStringReq BS.ByteString --ask the server to round trip arbitrary bytes

45 deriving (Generic, Show)

46 deriving (Generic, Show)

46− deriving Serialise via WineryVariant WaitMillisecondsReq

47+ deriving Serialise via WineryVariant BenchRequest

48−data WaitByteStringReq = WaitByteStringReq BS.ByteString

49+data BenchResponse = WaitMillisecondsResp

49− deriving (Generic, Show)

50+ | WaitByteStringResp BS.ByteString

50− deriving Serialise via WineryVariant WaitByteStringReq

51−

52−data WaitMillisecondsResp = WaitMillisecondsResp

53 deriving (Generic, Show, Eq)

51 deriving (Generic, Show, Eq)

54− deriving Serialise via WineryVariant WaitMillisecondsResp

52+ deriving Serialise via WineryVariant BenchResponse

56−benchmarkServerRequestHandlers :: RequestHandlers a

54+benchmarkServerMessageHandler :: BenchRequest -> IO (HandlerResponse BenchResponse)

57−benchmarkServerRequestHandlers =

58− [RequestHandler $ \_ (WaitMillisecondsReq ms) -> do

55+benchmarkServerMessageHandler (WaitMillisecondsReq ms) = do

59− threadDelay (1000 * ms)

56+ threadDelay (1000 * ms)

60− pure WaitMillisecondsResp,

57+ pure (HandlerResponse WaitMillisecondsResp)

61− RequestHandler $ \_ (WaitByteStringReq bs) ->

58+benchmarkServerMessageHandler (WaitByteStringReq bs) = pure (HandlerResponse (WaitByteStringResp bs))

62− pure bs

63− ]

65--perform 10000 small synchronous requests

60--perform 10000 small synchronous requests

66−syncWaitRequest :: Connection -> Int -> IO Int

61+syncWaitRequest :: Connection BenchResponse -> Int -> IO Int

67syncWaitRequest conn ms = do

62syncWaitRequest conn ms = do

68 ret <- call conn (WaitMillisecondsReq ms)

63 ret <- call conn (WaitMillisecondsReq ms)

69 when (ret /= Right WaitMillisecondsResp) (error "ret failed")

64 when (ret /= Right WaitMillisecondsResp) (error "ret failed")

70 pure ms

65 pure ms

72−syncByteStringRequest :: Connection -> BS.ByteString -> IO BS.ByteString

67+syncByteStringRequest :: Connection BenchResponse -> BS.ByteString -> IO BS.ByteString

73syncByteStringRequest conn bs = do

68syncByteStringRequest conn bs = do

74 ret <- call conn (WaitByteStringReq bs)

69 ret <- call conn (WaitByteStringReq bs)

75 case ret of

70 case ret of

76− Right bs' -> pure bs'

71+ Right (WaitByteStringResp bs') -> pure bs'

72+ Right _ -> error "invalid resp"

77 Left err -> error (show err)

73 Left err -> error (show err)

cabal.project+1−1

@@ -3,4 +3,4 @@ packages: .

3source-repository-package

4 type: git

5 location: https://github.com/composewell/streamly.git

6− tag: 4e48b52e8709390a47e99c107ebed2d1c9420076

6+ tag: e218fb9d8f4263fd69d32a2ff318bac0e179c642

curryer-rpc.cabal → curryer.cabalrenamed+7−21

@@ -1,4 +1,4 @@

1−Name: curryer-rpc

1+Name: curryer

2Version: 0.1

3License: PublicDomain

4Build-Type: Simple

@@ -11,14 +11,14 @@ Maintainer: agentm@themactionfaction.com

11Cabal-Version: >= 1.10

12Synopsis: Fast, Haskell RPC

13Description: Haskell-to-Haskell RPC using Winery serialization.

14−Extra-Source-Files: Changelog.markdown README.markdown cabal.project

14+Extra-Source-Files: Changelog.markdown README.markdown

16Source-Repository head

17 Type: git

18 location: https://github.com/agentm/curryer

20Library

21− Build-Depends: base >= 4.12 && < 4.15

21+ Build-Depends: base >= 4.8

22 , winery

23 , bytestring

24 , streamly >= 0.7.2

@@ -33,7 +33,6 @@ Library

33 , hashable

34 , time

35 , network-byte-order

36− , stm

37 Hs-Source-Dirs: ./src

36 Hs-Source-Dirs: ./src

38 Default-Language: Haskell2010

37 Default-Language: Haskell2010

39 ghc-options: -Wall -fwarn-unused-binds -fwarn-unused-imports

38 ghc-options: -Wall -fwarn-unused-binds -fwarn-unused-imports

@@ -51,33 +50,20 @@ Test-Suite test

51 build-depends: tasty

50 build-depends: tasty

52 , tasty-hunit

51 , tasty-hunit

53 , base

52 , base

54− , curryer-rpc

53+ , curryer

55 , winery

54 , winery

56 , network

55 , network

57 , async

56 , async

58− , stm

59 other-modules: Curryer.Test.Basic

57 other-modules: Curryer.Test.Basic

61Benchmark perf

59Benchmark perf

62 Default-Language: Haskell2010

60 Default-Language: Haskell2010

63 Default-Extensions: OverloadedStrings

61 Default-Extensions: OverloadedStrings

64− Build-Depends: base, criterion, curryer-rpc, network, winery, async, bytestring

62+ Build-Depends: base, criterion, curryer, network, winery, async, bytestring

66 Main-Is: Basic.hs

64 Main-Is: Basic.hs

67 Type: exitcode-stdio-1.0

65 Type: exitcode-stdio-1.0

68− GHC-Options: -Wall -threaded -rtsopts

66+ GHC-Options: -Wall -threaded -rtsopts -fprof-auto

69− -- -fprof-auto

70 HS-Source-Dirs: ./bench

67 HS-Source-Dirs: ./bench

72−Executable SimpleKeyValueServer

69+

73− Build-Depends: stm-containers, stm, base, curryer-rpc, winery

74− Main-Is: examples/SimpleKeyValueServer.hs

75− GHC-Options: -Wall -threaded

76− Default-Language: Haskell2010

77−

78−Executable SimpleKeyValueClient

79− Build-Depends: stm, base, curryer-rpc, winery, optparse-generic

80− Main-Is: examples/SimpleKeyValueClient.hs

81− GHC-Options: -Wall -threaded

82− Default-Language: Haskell2010

83−

examples/SimpleKeyValueClient.hsdeleted−39

@@ -1,39 +0,0 @@

1−{-# LANGUAGE DerivingVia, DeriveGeneric, OverloadedStrings #-}

2−import GHC.Generics

3−import Network.RPC.Curryer.Client

4−import Network.RPC.Curryer.Server (localHostAddr)

5−import Options.Generic

6−import Codec.Winery

7−

8−data SetKey = SetKey String String

9− deriving (Generic, Show)

10− deriving Serialise via WineryVariant SetKey

11−

12−data GetKey = GetKey String

13− deriving (Generic, Show)

14− deriving Serialise via WineryVariant GetKey

15−

16−data CommandOptions = Get {name :: String}

17− | Set {name :: String, value :: String}

18− deriving (Generic, Show)

19−

20−instance ParseRecord CommandOptions

21−

22−main :: IO ()

23−main = do

24− opts <- getRecord "SimpleKeyValueClient"

25− -- connect to the remote server (in this case on the localhost address)

26− conn <- connect [] localHostAddr 8765

27− case opts of

28− Get k -> do

29− --call the remote function and validate the result

30− eRet <- call conn (GetKey k)

31− case eRet of

32− Left err -> error (show err)

33− Right (Just val) -> putStrLn val

34− Right Nothing -> error "no such key"

35− Set k v -> do

36− eRet <- call conn (SetKey k v)

37− case eRet of

38− Left err -> error (show err)

39− Right () -> pure ()

examples/SimpleKeyValueServer.hsdeleted−30

@@ -1,30 +0,0 @@

1−{-# LANGUAGE DerivingVia, DeriveGeneric #-}

2−import Network.RPC.Curryer.Server

3−import Control.Concurrent.STM

4−import StmContainers.Map as M

5−import GHC.Generics

6−import Codec.Winery

7−import Data.Functor

8−

9−-- create data structures to represent remote function calls

10−data SetKey = SetKey String String

11− deriving (Generic, Show)

12− deriving Serialise via WineryVariant SetKey

13−

14−data GetKey = GetKey String

15− deriving (Generic, Show)

16− deriving Serialise via WineryVariant GetKey

17−

18−--call the `serve` function to handle incoming requests

19−main :: IO ()

20−main = do

21− kvmap <- M.newIO

22− void $ serve kvRequestHandlers kvmap localHostAddr 8765 Nothing

23−

24−-- setup incoming request handlers to operate on the server's state

25−kvRequestHandlers :: RequestHandlers (M.Map String String)

26−kvRequestHandlers = [ RequestHandler $ \state (SetKey k v) ->

27− atomically $ M.insert v k (connectionServerState state)

28− , RequestHandler $ \state (GetKey k) ->

29− atomically $ M.lookup k (connectionServerState state)

30− ]

src/Network/RPC/Curryer/Client.hs+62−98

@@ -1,4 +1,4 @@

1−{-# LANGUAGE RankNTypes, ScopedTypeVariables, GADTs #-}

1+{-# LANGUAGE TypeApplications, RankNTypes, ScopedTypeVariables #-}

2module Network.RPC.Curryer.Client where

3import Network.RPC.Curryer.Server

4import Network.Socket as Socket

@@ -11,114 +11,86 @@ import Control.Concurrent.MVar

11import GHC.Conc

12import Data.Time.Clock

13import System.Timeout

14−import Control.Monad

14+import Data.Proxy

16−type SyncMap = STMMap.Map UUID (MVar (Either ConnectionError BinaryMessage), UTCTime)

16+type SyncMap a = STMMap.Map UUID (MVar (Either ConnectionError a), UTCTime)

17+-- the request map holds

18+data Connection a = Connection { _conn_sock :: Socket,

19+ _conn_asyncThread :: Async (),

20+ _conn_syncmap :: SyncMap a

21+ }

18−-- | Represents a remote connection to server.

23+connect :: forall clientmsg. (Serialise clientmsg) =>

19−data Connection = Connection { _conn_sockLock :: Locking Socket,

24+ AsyncMessageHandler clientmsg ->

20− _conn_asyncThread :: Async (),

21− _conn_syncmap :: SyncMap

22− }

23−

24−-- | Function handlers run on the client, triggered by the server- useful for asynchronous callbacks.

25−data ClientAsyncRequestHandler where

26− ClientAsyncRequestHandler :: forall a. Serialise a => (a -> IO ()) -> ClientAsyncRequestHandler

27−

28−type ClientAsyncRequestHandlers = [ClientAsyncRequestHandler]

29−

30−-- | Connects to a remote server with specific async callbacks registered.

31−connect ::

32− ClientAsyncRequestHandlers ->

33− HostAddr ->

25+ HostAddr ->

34− PortNumber ->

26+ PortNumber ->

35− IO Connection

27+ IO (Connection clientmsg)

36−connect asyncHandlers hostAddr portNum = do

28+connect notificationCallback hostAddr portNum = do

37 sock <- TCP.connect hostAddr portNum

29 sock <- TCP.connect hostAddr portNum

38 syncmap <- STMMap.newIO

30 syncmap <- STMMap.newIO

31+ let decoder :: Decoder (Message clientmsg)

32+ decoder = case getDecoder (schema (Proxy @(Message clientmsg))) of

33+ Left err -> error (show err)

34+ Right dec -> dec

39− asyncThread <- async (clientAsync sock syncmap asyncHandlers)

35+ asyncThread <- async (clientAsync sock syncmap decoder notificationCallback)

40− sockLock <- newLock sock

41 pure (Connection {

36 pure (Connection {

42− _conn_sockLock = sockLock,

37+ _conn_sock = sock,

43 _conn_asyncThread = asyncThread,

38 _conn_asyncThread = asyncThread,

44 _conn_syncmap = syncmap

39 _conn_syncmap = syncmap

45 })

40 })

47−-- | Close the connection and release all connection resources.

48−close :: Connection -> IO ()

42+close :: Connection a -> IO ()

49close conn = do

43close conn = do

50− withLock (_conn_sockLock conn) $ \sock ->

44+ Socket.close (_conn_sock conn)

51− Socket.close sock

52 cancel (_conn_asyncThread conn)

45 cancel (_conn_asyncThread conn)

54−-- | async thread for handling client-side incoming messages- dispatch to proper waiting thread or asynchronous notifications handler

47+-- async thread for handling client-side incoming messages- dispatch to proper waiting thread or handler asynchronous notifications

55−clientAsync ::

48+clientAsync :: forall b. Serialise b =>

56 Socket ->

49 Socket ->

57− SyncMap ->

50+ SyncMap b ->

58− ClientAsyncRequestHandlers ->

51+ Decoder (Message b) ->

52+ AsyncMessageHandler b ->

59 IO ()

53 IO ()

60−clientAsync sock syncmap asyncHandlers = do

54+clientAsync sock syncmap decoder asyncHandler = do

61− lsock <- newLock sock

55+ -- ping proper thread to continue

56+ let findRequest requestId =

57+ atomically $ do

58+ val' <- STMMap.lookup requestId syncmap

59+ STMMap.delete requestId syncmap

60+ pure val'

61+

62+ let responseHandler responseMsg = do

63+ --putStrLn "client-side message handler"

64+ case responseMsg of

65+ Response requestId val -> do

66+ varval <- findRequest requestId

67+ case varval of

68+ Nothing -> error "dumped unrequested response"

69+ Just (mVar,_) -> putMVar mVar (Right val)

70+ AsyncRequest _ asyncMsg ->

71+ asyncHandler asyncMsg

72+ ResponseExpectedRequest{} -> error "dumped response expected request"

73+ ExceptionResponse _ -> error "TODO Exception"

74+ TimedOutResponse requestId -> do

75+ varval <- findRequest requestId

76+ case varval of

77+ Nothing -> error "dumped unrequested timeout response"

78+ Just (mVar,_) -> putMVar mVar (Left TimeoutError)

62− drainSocketMessages sock (clientEnvelopeHandler asyncHandlers lsock syncmap)

79+ drainSocketMessages sock decoder responseHandler

64−consumeResponse :: UUID -> STMMap.Map UUID (MVar a, b) -> a -> IO ()

65−consumeResponse msgId syncMap val = do

66− match <- atomically $ do

67− val' <- STMMap.lookup msgId syncMap

68− STMMap.delete msgId syncMap

69− pure val'

70− case match of

71− Nothing -> pure () -- drop message

72− Just (mVar, _) -> putMVar mVar val

73−

74−-- | handles envelope responses from server- timeout from ths server is ignored, but perhaps that's proper for trusted servers- the server expects the client to process all async requests

75−clientEnvelopeHandler ::

76− ClientAsyncRequestHandlers

77− -> Locking Socket

78− -> SyncMap

79− -> Envelope

80− -> IO ()

81−clientEnvelopeHandler handlers _ _ envelope@(Envelope _ (RequestMessage _) _ _) = do

82− --should this run off on another green thread?

83− let firstMatcher Nothing (ClientAsyncRequestHandler (dispatchf :: a -> IO ())) = do

84− case openEnvelope envelope of

85− Nothing -> pure Nothing

86− Just decoded -> do

87− dispatchf decoded

88− pure (Just ())

89− firstMatcher acc _ = pure acc

90− foldM_ firstMatcher Nothing handlers

91−clientEnvelopeHandler _ _ syncMap (Envelope _ ResponseMessage msgId binaryMessage) =

92− consumeResponse msgId syncMap (Right binaryMessage)

93−clientEnvelopeHandler _ _ syncMap (Envelope _ TimeoutResponseMessage msgId _) =

94− consumeResponse msgId syncMap (Left TimeoutError)

95−clientEnvelopeHandler _ _ syncMap (Envelope _ ExceptionResponseMessage msgId excPayload) =

96− case deserialise excPayload of

97− Left err -> error ("failed to deserialise exception string" <> show err)

98− Right excStr ->

99− consumeResponse msgId syncMap (Left (ExceptionError excStr))

100−

101−-- | Basic remote function call via data type and return value.

102−call :: (Serialise request, Serialise response) => Connection -> request -> IO (Either ConnectionError response)

81+call :: (Serialise request, Serialise response) => Connection response -> request -> IO (Either ConnectionError response)

103call = callTimeout Nothing

82call = callTimeout Nothing

104

105−-- | Send a request to the remote server and returns a response but with the possibility of a timeout after n microseconds.

84+-- | Send a request to the remote server and returns a response.

106−callTimeout :: (Serialise request, Serialise response) => Maybe Int -> Connection -> request -> IO (Either ConnectionError response)

85+callTimeout :: (Serialise request, Serialise response) => Maybe Int -> Connection response -> request -> IO (Either ConnectionError response)

107callTimeout mTimeout conn msg = do

86callTimeout mTimeout conn msg = do

108− requestID <- UUID <$> UUIDBase.nextRandom

109 let mVarMap = _conn_syncmap conn

87 let mVarMap = _conn_syncmap conn

110− timeoutms = case mTimeout of

88+ requestID <- UUID <$> UUIDBase.nextRandom

111− Nothing -> 0

112− Just tm | tm < 0 -> 0

113− Just tm -> fromIntegral tm

114−

115− envelope = Envelope fprint (RequestMessage timeoutms) requestID (serialise msg)

116− fprint = fingerprint msg

117 -- setup mvar to wait for response

89 -- setup mvar to wait for response

118 responseMVar <- newEmptyMVar

90 responseMVar <- newEmptyMVar

119 now <- getCurrentTime

91 now <- getCurrentTime

120 atomically $ STMMap.insert (responseMVar, now) requestID mVarMap

92 atomically $ STMMap.insert (responseMVar, now) requestID mVarMap

121− sendEnvelope envelope (_conn_sockLock conn)

93+ sendMessage (ResponseExpectedRequest requestID mTimeout msg) (_conn_sock conn)

122 let timeoutMicroseconds =

94 let timeoutMicroseconds =

123 case mTimeout of

95 case mTimeout of

124 Just timeout' -> timeout' + 100 --add 100 ms to account for unknown network latency

96 Just timeout' -> timeout' + 100 --add 100 ms to account for unknown network latency

@@ -129,19 +101,11 @@ callTimeout mTimeout conn msg = do

129 --timeout

101 --timeout

130 Nothing ->

102 Nothing ->

131 pure (Left TimeoutError)

103 pure (Left TimeoutError)

132− Just (Left exc) ->

104+ Just res -> pure res

133− pure (Left exc)

134− Just (Right binmsg) ->

135− --TODO use decoder instead

136− case deserialise binmsg of

137− Left err -> error ("deserialise client error " <> show err)

138− Right m -> pure (Right m)

139

105

140−-- | Call a remote function but do not expect a response from the server.

141−asyncCall :: Serialise request => Connection -> request -> IO (Either ConnectionError ())

106+asyncCall :: (Serialise request, Serialise response) => Connection response -> request -> IO (Either ConnectionError ())

142asyncCall conn msg = do

107asyncCall conn msg = do

143 requestID <- UUID <$> UUIDBase.nextRandom

108 requestID <- UUID <$> UUIDBase.nextRandom

144− let envelope = Envelope fprint (RequestMessage 0) requestID (serialise msg)

109+ sendMessage (AsyncRequest requestID msg) (_conn_sock conn)

145− fprint = fingerprint msg

146− sendEnvelope envelope (_conn_sockLock conn)

147 pure (Right ())

110 pure (Right ())

111+

src/Network/RPC/Curryer/Server.hs+129−250

@@ -1,20 +1,18 @@

1−{-# LANGUAGE DerivingVia, DeriveGeneric, RankNTypes, ScopedTypeVariables, MultiParamTypeClasses, OverloadedStrings, GeneralizedNewtypeDeriving, CPP, ExistentialQuantification, StandaloneDeriving, GADTs, RecordWildCards #-}

1+{-# LANGUAGE DerivingVia, DeriveGeneric, RankNTypes, ScopedTypeVariables, MultiParamTypeClasses, OverloadedStrings, GeneralizedNewtypeDeriving, TypeApplications, CPP #-}

2−{-# OPTIONS_GHC -fno-warn-orphans #-}

3{- HLINT ignore "Use lambda-case" -}

2{- HLINT ignore "Use lambda-case" -}

4module Network.RPC.Curryer.Server where

3module Network.RPC.Curryer.Server where

4+import Streamly

5import qualified Streamly.Prelude as S

6import Streamly.Network.Socket

7import Streamly.Internal.Network.Socket (handleWithM)

8import Network.Socket as Socket

9import Network.Socket.ByteString as Socket

10−import Streamly.Internal.Data.Parser as P hiding (concatMap)

10+import Streamly.Internal.Data.Parser as P

11import Codec.Winery

12import Codec.Winery.Internal (varInt, decodeVarInt, getBytes)

13import Codec.Winery.Class (mkExtractor)

14import GHC.Generics

15−import GHC.Fingerprint

16−import Data.Typeable

17−import Control.Concurrent.MVar (MVar, newMVar, withMVar)

15+import Control.Concurrent.MVar (MVar)

18import Control.Exception

16import Control.Exception

19import Data.Function ((&))

17import Data.Function ((&))

20import Data.Word

18import Data.Word

@@ -26,23 +24,21 @@ import qualified Streamly.Internal.Data.Stream.IsStream as S

26import qualified Data.Binary as B

24import qualified Data.Binary as B

27import qualified Data.UUID as UUIDBase

25import qualified Data.UUID as UUIDBase

28import qualified Data.UUID.V4 as UUIDBase

26import qualified Data.UUID.V4 as UUIDBase

29−import Control.Monad

30−import Data.Functor

32import qualified Network.RPC.Curryer.StreamlyAdditions as SA

28import qualified Network.RPC.Curryer.StreamlyAdditions as SA

33−--import Control.Monad

29+import Control.Monad

34import Data.Hashable

30import Data.Hashable

35import System.Timeout

31import System.Timeout

36import qualified Network.ByteOrder as BO

32import qualified Network.ByteOrder as BO

37−

33+import Data.Proxy

39-- for toArrayS conversion

35-- for toArrayS conversion

40−import qualified Data.ByteString.Internal as BSI

36+{-import qualified Data.ByteString.Internal as BSI

41−import qualified Streamly.Internal.Data.Array.Storable.Foreign.Types as Arr

37+import qualified Streamly.Internal.Data.Array.Storable.Foreign.Types as SA

38+import Foreign.ForeignPtr (plusForeignPtr)

42import Foreign.ForeignPtr.Unsafe (unsafeForeignPtrToPtr)

39import Foreign.ForeignPtr.Unsafe (unsafeForeignPtrToPtr)

43−import GHC.Ptr (minusPtr)

40+import GHC.Ptr (plusPtr)

44−

41+-}

45−-- define CURRYER_SHOW_BYTES 1

46#if CURRYER_SHOW_BYTES == 1

42#if CURRYER_SHOW_BYTES == 1

47import Debug.Trace

43import Debug.Trace

48#endif

44#endif

@@ -54,72 +50,24 @@ traceBytes msg bs = traceShowM (msg, BS.length bs, bs)

54traceBytes _ _ = pure ()

50traceBytes _ _ = pure ()

55#endif

51#endif

57−data Locking a = Locking (MVar ()) a

58−

59−newLock :: a -> IO (Locking a)

60−newLock x = do

61− lock <- newMVar ()

62− pure (Locking lock x)

63−

64−withLock :: Locking a -> (a -> IO b) -> IO b

65−withLock (Locking mvar v) m =

66− withMVar mvar $ \_ -> m v

67−

68−lockless :: Locking a -> a

69−lockless (Locking _ a) = a

70−

71−type Timeout = Word32

53+type Timeout = Int

72−

73−type BinaryMessage = BS.ByteString

75−--includes the fingerprint of the incoming data type (held in the BinaryMessage) to determine how to dispatch the message.

55+data Message a = Response UUID a

76−--add another envelope type for unencoded binary messages for any easy optimization for in-process communication

56+ | AsyncRequest UUID a

77−data Envelope = Envelope {

57+ | ResponseExpectedRequest UUID (Maybe Timeout) a

78− envFingerprint :: !Fingerprint,

58+ | TimedOutResponse UUID

79− envMessageType :: !MessageType,

59+ -- | Services

80− envMsgId :: !UUID,

60+ | ExceptionResponse String

81− envPayload :: !BinaryMessage

82− }

83− deriving (Generic, Show)

61+ deriving (Generic, Show)

62+ deriving Serialise via WineryVariant (Message a)

85−type TimeoutMicroseconds = Int

64+-- | The response type

65+data HandlerResponse a = NoResponse

66+ | HandlerResponse a

67+ | HandlerException a

68+ deriving Generic

69+ deriving Serialise via WineryVariant (HandlerResponse a)

87−deriving instance Generic Fingerprint

88−deriving via WineryVariant Fingerprint instance Serialise Fingerprint

89−

90−-- | Internal type used to mark envelope types.

91−data MessageType = RequestMessage TimeoutMicroseconds

92− | ResponseMessage

93− | TimeoutResponseMessage

94− | ExceptionResponseMessage

95− deriving (Generic, Show)

96− deriving Serialise via WineryVariant MessageType

97−

98−-- | A list of `RequestHandler`s.

99−type RequestHandlers serverState = [RequestHandler serverState]

100−

101−-- | Data types for server-side request handlers, in synchronous (client waits for return value) and asynchronous (client does not wait for return value) forms.

102−data RequestHandler serverState where

103− -- | create a request handler with a response

104− RequestHandler :: forall a b serverState. (Serialise a, Serialise b) => (ConnectionState serverState -> a -> IO b) -> RequestHandler serverState

105− -- | create an asynchronous request handler where the client does not expect nor await a response

106− AsyncRequestHandler :: forall a serverState. Serialise a => (ConnectionState serverState -> a -> IO ()) -> RequestHandler serverState

107−

108−-- | Server state sent in via `serve` and passed to `RequestHandler`s.

109−data ConnectionState a = ConnectionState {

110− connectionServerState :: a,

111− connectionSocket :: Locking Socket

112− }

113−

114−-- | Used by server-side request handlers to send additional messages to the client. This is useful for sending asynchronous responses to the client outside of the normal request-response flow. The locking socket can be found in the ConnectionState when a request handler is called.

115−sendMessage :: Serialise a => Locking Socket -> a -> IO ()

116−sendMessage lockSock msg = do

117− requestID <- UUID <$> UUIDBase.nextRandom

118− let env =

119− Envelope (fingerprint msg) (RequestMessage timeout') requestID (serialise msg)

120− timeout' = 0

121− sendEnvelope env lockSock

122−

123--avoid orphan instance

71--avoid orphan instance

124newtype UUID = UUID { _unUUID :: UUIDBase.UUID }

72newtype UUID = UUID { _unUUID :: UUIDBase.UUID }

125 deriving (Show, Eq, B.Binary, Hashable)

73 deriving (Show, Eq, B.Binary, Hashable)

@@ -138,18 +86,12 @@ instance Serialise UUID where

138 x -> error $ "invalid schema element " <> show x

86 x -> error $ "invalid schema element " <> show x

139 decodeCurrent = B.decode . BSL.fromStrict <$> (decodeVarInt >>= getBytes)

87 decodeCurrent = B.decode . BSL.fromStrict <$> (decodeVarInt >>= getBytes)

140

141−-- | Errors from remote calls.

89+

142data ConnectionError = CodecError String -- show of WineryException from exception initiator which cannot otherwise be transmitted over a line due to dependencies on TypeReps

90data ConnectionError = CodecError String -- show of WineryException from exception initiator which cannot otherwise be transmitted over a line due to dependencies on TypeReps

143 | TimeoutError

91 | TimeoutError

144− | ExceptionError String

145 deriving (Generic, Show, Eq)

92 deriving (Generic, Show, Eq)

146 deriving Serialise via WineryVariant ConnectionError

93 deriving Serialise via WineryVariant ConnectionError

147

148−data TimeoutException = TimeoutException

149− deriving Show

150−

151−instance Exception TimeoutException

152−

153type HostAddr = (Word8, Word8, Word8, Word8)

95type HostAddr = (Word8, Word8, Word8, Word8)

154

155allHostAddrs,localHostAddr :: HostAddr

97allHostAddrs,localHostAddr :: HostAddr

@@ -157,186 +99,123 @@ allHostAddrs = (0,0,0,0)

157localHostAddr = (127,0,0,1)

99localHostAddr = (127,0,0,1)

158

100

159-- Each message is length-prefixed by a 32-bit unsigned length.

101-- Each message is length-prefixed by a 32-bit unsigned length.

160−envelopeP :: Parser IO Word8 Envelope

102+messageBoundaryP :: Parser IO Word8 BS.ByteString

161−envelopeP = do

103+messageBoundaryP = do

162− let msgTypeP = (P.satisfy (== 0) *>

163− (RequestMessage . fromIntegral <$> word32P)) `P.alt`

164− (P.satisfy (== 1) $> ResponseMessage) `P.alt`

165− (P.satisfy (== 2) $> TimeoutResponseMessage) `P.alt`

166− (P.satisfy (== 3) $> ExceptionResponseMessage)

167− lenPrefixedByteStringP = do

168− c <- fromIntegral <$> word32P

169− --streamly can't handle takeEQ 0, so add special handling

170− if c == 0 then

171− pure BS.empty

172− else

173− fromArray <$> P.takeEQ c (Arr.writeN c)

174− Envelope <$> fingerprintP <*> msgTypeP <*> uuidP <*> lenPrefixedByteStringP

175−

176−encodeEnvelope :: Envelope -> BS.ByteString

177−encodeEnvelope (Envelope (Fingerprint fp1 fp2) msgType msgId bs) =

178− fingerprintBs <> msgTypeBs <> msgIdBs <> lenPrefixedBs

179− where

180− fingerprintBs = BO.bytestring64 fp1 <> BO.bytestring64 fp2

181− msgTypeBs = case msgType of

182− RequestMessage timeoutms -> BS.singleton 0 <> BO.bytestring32 (fromIntegral timeoutms)

183− ResponseMessage -> BS.singleton 1

184− TimeoutResponseMessage -> BS.singleton 2

185− ExceptionResponseMessage -> BS.singleton 3

186− msgIdBs =

187− case UUIDBase.toWords (_unUUID msgId) of

188− (u1, u2, u3, u4) -> foldr ((<>) . BO.bytestring32) BS.empty [u1, u2, u3, u4]

189− msgLen = fromIntegral (BS.length bs)

190− lenPrefixedBs = BO.bytestring32 msgLen <> bs

191−

192−fingerprintP :: Parser IO Word8 Fingerprint

193−fingerprintP =

194− Fingerprint <$> word64P <*> word64P

195−

196−word64P :: Parser IO Word8 Word64

197−word64P = do

198 let s = FL.toList

104 let s = FL.toList

199− b <- P.takeEQ 8 s

105+ w4x8 <- P.take 4 s

200− pure (BO.word64 (BS.pack b))

106+ --traceShowM ("w4x8"::String, w4x8)

201−

202−--parse a 32-bit integer from network byte order

203−word32P :: Parser IO Word8 Word32

204−word32P = do

205− let s = FL.toList

206− w4x8 <- P.takeEQ 4 s

207− pure (BO.word32 (BS.pack w4x8))

107+ let c = fromIntegral (BO.word32 (BS.pack w4x8))

208−

108+ --traceShowM ("c"::String, c)

209−-- uuid is encode as 4 32-bit words because of its convenient 32-bit tuple encoding

109+ vals <- P.take c s

210−uuidP :: Parser IO Word8 UUID

110+ let bytes = BS.pack vals

211−uuidP = do

111+ --traceShowM ("parsedBytes"::String, c, BS.length bytes, bytes)

212− u1 <- word32P

112+ pure bytes

213− u2 <- word32P

214− u3 <- word32P

215− --u4 <- word32P

216− --pure (UUID (UUIDBase.fromWords u1 u2 u3 u4))-}

217− --(UUID . UUIDBase.fromWords) <$> word32P <*> word32P <*> word32P <*> word32P

218− UUID . UUIDBase.fromWords u1 u2 u3 <$> word32P

219

113

220type NewConnectionHandler msg = IO (Maybe msg)

114type NewConnectionHandler msg = IO (Maybe msg)

221

115

222−type NewMessageHandler req resp = req -> IO resp

116+type NewMessageHandler req resp = req -> IO (HandlerResponse resp)

223−

117+

224−-- | Listen for new connections and handle requests which are passed the server state 's'. The MVar SockAddr can be be optionally used to know when the server is ready for processing requests.

118+serve :: forall req resp. (Show req, Serialise req, Serialise resp) =>

225−serve ::

119+ NewConnectionHandler resp ->

226− RequestHandlers s->

120+ NewMessageHandler req resp ->

227− s ->

228 HostAddr ->

121 HostAddr ->

229 PortNumber ->

122 PortNumber ->

230 Maybe (MVar SockAddr) ->

123 Maybe (MVar SockAddr) ->

231 IO Bool

124 IO Bool

232−serve userMsgHandlers serverState hostaddr port mSockLock = do

125+serve connhandler userMsgHandler hostaddr port mSockLock = do

233 let

126 let

127+ decoder :: NewMessageHandler req resp -> Decoder (Message req)

128+ decoder _ =

129+ case getDecoder (schema (Proxy @(Message req))) of

130+ Left exc -> error (show exc)

131+ Right dec -> dec

234 handleSock sock = do

132 handleSock sock = do

235− lockingSocket <- newLock sock

133+ -- allow the server to send an async welcome message to the new client, if necessary

236− drainSocketMessages sock (serverEnvelopeHandler lockingSocket userMsgHandlers serverState)

134+ mResp <- connhandler

237−

135+ case mResp of

136+ Nothing -> pure ()

137+ Just resp -> do

138+ requestID <- UUID <$> UUIDBase.nextRandom

139+ sendMessage (AsyncRequest requestID resp) sock

140+ drainSocketMessages sock (decoder userMsgHandler) (serverMessageHandler sock userMsgHandler)

238− S.serially (S.unfold (SA.acceptOnAddrWith [(ReuseAddr,1)] mSockLock) (hostaddr, port)) & S.parallely . S.mapM (handleWithM handleSock) & S.drain

141+ serially (S.unfold (SA.acceptOnAddrWith [(ReuseAddr,1)] mSockLock) (hostaddr, port)) & parallely . S.mapM (handleWithM handleSock) & S.drain

239 pure True

142 pure True

240

143

241−openEnvelope :: forall s. (Serialise s, Typeable s) => Envelope -> Maybe s

144+serverMessageHandler :: forall req resp. (Show req,

242−openEnvelope (Envelope eprint _ _ bytes) =

145+ Serialise req,

243− if eprint == fingerprint (undefined :: s) then

146+ Serialise resp)

244− case deserialise bytes of

245− Left err -> error (show err)

246− Right v -> Just v

247− else

248− Nothing

249−

250−matchEnvelope :: forall a b s. (Serialise a, Serialise b, Typeable b) =>

251− Envelope ->

252− (ConnectionState s -> a -> IO b) ->

253− Maybe (ConnectionState s -> a -> IO b, a)

254−matchEnvelope envelope dispatchf =

255− case openEnvelope envelope :: Maybe a of

256− Nothing -> Nothing

257− Just decoded -> Just (dispatchf, decoded)

258−

259−-- | Called by `serve` to process incoming envelope requests. Never returns, so use `async` to spin it off on another thread.

260−serverEnvelopeHandler ::

261− Locking Socket

147+ => Socket

262− -> RequestHandlers s

148+ -> NewMessageHandler req resp

263− -> s

149+ -> Message req

264− -> Envelope

265 -> IO ()

150 -> IO ()

266−serverEnvelopeHandler _ _ _ (Envelope _ TimeoutResponseMessage _ _) = pure ()

151+serverMessageHandler sock requestMessageHandler msg = do

267−serverEnvelopeHandler _ _ _ (Envelope _ ExceptionResponseMessage _ _) = pure ()

152+ --putStrLn $ "GOT MSG " ++ show msg

268−serverEnvelopeHandler _ _ _ (Envelope _ ResponseMessage _ _) = pure ()

269−serverEnvelopeHandler sockLock msgHandlers serverState envelope@(Envelope _ (RequestMessage timeoutms) msgId _) = do

270− --find first matching handler

271− let runTimeout :: IO b -> IO (Maybe b)

153+ let --runTimeout :: IO (HandlerResponse resp) -> IO (Maybe (HandlerResponse resp))

272− runTimeout m =

154+ runTimeout mTimeout m = case mTimeout of

273− if timeoutms == 0 then

155+ Nothing -> Just <$> m

274− (Just <$> m) `catch` timeoutExcHandler

156+ Just timeoutMicroseconds -> timeout timeoutMicroseconds m

275− else

157+ case msg of

276− (timeout (fromIntegral timeoutms) m) `catch` timeoutExcHandler

158+ Response{} -> putStrLn "client sent response"

277− --allow server-side function to throw TimeoutError which is caught here and becomes TimeoutError value

159+ ResponseExpectedRequest requestID mTimeout val -> do

278− timeoutExcHandler :: TimeoutException -> IO (Maybe b)

160+ resp <- runTimeout mTimeout (requestMessageHandler val)

279− timeoutExcHandler _ = pure Nothing

161+ case resp of

280−

162+ Just (HandlerResponse responseVal) -> sendMessage (Response requestID responseVal) sock

281− sState = ConnectionState {

163+ Just NoResponse -> error "attempt to return non-response to expected response message"

282− connectionServerState = serverState,

164+ Just (HandlerException _) -> error "TODO HandlerException"

283− connectionSocket = sockLock

165+ Nothing ->

284− }

166+ sendMessage (TimedOutResponse @(Message resp) requestID) sock

285−

167+ AsyncRequest _ val -> do

286− firstMatcher (RequestHandler msghandler) Nothing =

168+ void $ requestMessageHandler val

287− case matchEnvelope envelope msghandler of

169+ --no response necessary

288− Nothing -> pure Nothing

170+ ExceptionResponse{} -> putStrLn "client sent exception response"

289− Just (dispatchf, decoded) -> do

171+ TimedOutResponse{} -> putStrLn "client sent timed out response"

290− --TODO add exception handling

172+

291− mResponse <- runTimeout (dispatchf sState decoded)

173+--add callback to allow for responses via socket

292− let envelopeResponse =

174+type MessageHandler a = Message a -> IO ()

293− case mResponse of

175+

294− Just response ->

176+type AsyncMessageHandler a = a -> IO ()

295− Envelope (fingerprint response) ResponseMessage msgId (serialise response)

177+

296− Nothing ->

178+

297− Envelope (fingerprint TimeoutError) TimeoutResponseMessage msgId BS.empty

179+

298− sendEnvelope envelopeResponse sockLock

180+drainSocketMessages :: Serialise msg => Socket -> Decoder (Message msg) -> MessageHandler msg -> IO ()

299− pure (Just ())

300− firstMatcher (AsyncRequestHandler msghandler) Nothing =

301− case matchEnvelope envelope msghandler of

302− Nothing -> pure Nothing

303− Just (dispatchf, decoded) -> do

304− _ <- dispatchf sState decoded

305− pure (Just ())

306− firstMatcher _ acc = pure acc

307− eExc <- try $ foldM_ (flip firstMatcher) Nothing msgHandlers :: IO (Either SomeException ())

308− case eExc of

309− Left exc ->

310− let env = Envelope (fingerprint (show exc)) ExceptionResponseMessage msgId (serialise (show exc)) in

311− sendEnvelope env sockLock

312− Right () -> pure ()

313−

314−

315−type EnvelopeHandler = Envelope -> IO ()

316−

317−drainSocketMessages :: Socket -> EnvelopeHandler -> IO ()

318−drainSocketMessages sock envelopeHandler = do

181+drainSocketMessages sock decoder msgHandler = do

319 let sockStream = S.unfold readWithBufferOf (1024 * 4, sock)

182 let sockStream = S.unfold readWithBufferOf (1024 * 4, sock)

183+ handler bs = do

184+ let decoded = evalDecoder decoder bs

185+ msgHandler decoded

320− S.drain $ S.serially $ S.parseMany envelopeP sockStream & S.mapM envelopeHandler

186+ S.drain $ serially $ S.parseMany messageBoundaryP sockStream & S.mapM handler

321

187

322--send length-tagged bytestring, perhaps should be in network byte order?

188--send length-tagged bytestring, perhaps should be in network byte order?

323−sendEnvelope :: Envelope -> Locking Socket -> IO ()

189+sendMessage :: Serialise a => Message a -> Socket -> IO ()

324−sendEnvelope envelope sockLock = do

190+sendMessage msg socket' = do

325− let envelopebytes = encodeEnvelope envelope

191+ let

326− fullbytes = envelopebytes

192+ msgbytes = serialiseOnly msg

327− --Socket.sendAll syscalls send() on a loop until all the bytes are sent, so we need socket locking here to account for serialized messages of size > PIPE_BUF

193+ fullbytes = lenbytes <> msgbytes

328− withLock sockLock $ \socket' ->

194+ len = BS.length msgbytes

329− Socket.sendAll socket' fullbytes

195+ lenbytes = BO.bytestring32 (fromIntegral len)

330− --traceShowM ("sendEnvelope", envelope)

196+

331− traceBytes "sendEnvelope" fullbytes

197+ byteCount <- Socket.send socket' fullbytes

332−

198+ when (byteCount /= BS.length fullbytes) (error "bytes sent mismatch")

333−fingerprint :: Typeable a => a -> Fingerprint

199+ traceBytes "sent bytes" fullbytes

334−fingerprint = typeRepFingerprint . typeOf

200+

201+

202+

203+--from streamly-bytestring

204+-- | Convert a 'ByteString' to an array of 'Word8'. This function unwraps the

205+-- 'ByteString' and wraps it with 'Array' constructors and hence the operation

206+-- is performed in constant time.

207+{-

208+{-# INLINE toArrayS #-}

209+toArrayS :: BS.ByteString -> SA.Array Word8

210+--slow path

211+--toArrayS = SA.fromList . BS.unpack

212+toArrayS (BSI.PS fp off len) = SA.Array nfp endPtr

213+ where

214+ nfp = fp `plusForeignPtr` off

215+ endPtr = unsafeForeignPtrToPtr nfp `plusPtr` len `plusPtr` 1 -- ? why +1?

335

216

336−fromArray :: Arr.Array Word8 -> BSI.ByteString

217+toArraySlow :: BS.ByteString -> SA.Array Word8

337−fromArray Arr.Array {..}

218+toArraySlow bs = arr

338− | aLen == 0 = mempty

339− | otherwise = BSI.PS aStart 0 aLen

340 where

219 where

341− aStartPtr = unsafeForeignPtrToPtr aStart

220+ arr = SA.fromList (BS.unpack bs)

342− aLen = aEnd `minusPtr` aStartPtr

221+-}

test/Curryer/Test/Basic.hs+67−160

@@ -1,4 +1,4 @@

1−{-# LANGUAGE DerivingVia, DeriveGeneric, TypeApplications, ExistentialQuantification #-}

1+{-# LANGUAGE DerivingVia, DeriveGeneric, TypeApplications #-}

2module Curryer.Test.Basic where

3import Test.Tasty

4import Test.Tasty.HUnit

@@ -9,133 +9,104 @@ import Network.Socket (SockAddr(..))

9import Control.Concurrent.Async

10import Control.Monad

11import Control.Concurrent

12−import Control.Concurrent.STM

13−import Control.Exception

14−import Data.List

16import Network.RPC.Curryer.Server

13import Network.RPC.Curryer.Server

17import Network.RPC.Curryer.Client

14import Network.RPC.Curryer.Client

19−-- TODO: add test for nested calls

20−

21testTree :: TestTree

16testTree :: TestTree

22−testTree = testGroup "basic" [testCase "simple" testSimpleCall

17+testTree = testGroup "basic" [testCase "simple" testSimpleCall,

23− ,testCase "client async" testAsyncServerCall

18+ testCase "client async" testAsyncServerCall,

24− ,testCase "server async" testAsyncClientCall

19+ testCase "server async" testAsyncClientCall,

25− ,testCase "client sync timeout" testSyncClientCallTimeout

20+ testCase "client sync timeout" testSyncClientCallTimeout

26− ,testCase "server-side exception" testSyncException

27− ,testCase "multi-threaded client" testMultithreadedClient

28− ,testCase "server state" testServerState

29− ,testCase "request handler throws timeout" testRequestHandlerThrowTimeout

30 ]

21 ]

32−

23+--client-to-server request

33−data AddTwoNumbersReq = AddTwoNumbersReq Int Int

24+data TestRequest = AddTwoNumbersReq Int Int

25+ | TestAsyncReq String

26+ | TestCallMeBackReq String

27+ | DelayMicrosecondsReq Int

34 deriving (Generic, Show)

28 deriving (Generic, Show)

35− deriving Serialise via WineryVariant AddTwoNumbersReq

29+ deriving Serialise via WineryVariant TestRequest

37−data TestCallMeBackReq = TestCallMeBackReq String

31+--server responds to client

32+data TestResponse = AddTwoNumbersResp Int

33+ | AsyncHello String

34+ | TestCallMeBackResp String

35+ | DelayMicrosecondsResp

38 deriving (Generic, Show, Eq)

36 deriving (Generic, Show, Eq)

39− deriving Serialise via WineryVariant TestCallMeBackReq

37+ deriving Serialise via WineryVariant TestResponse

40−

38+

41−data TestAsyncReq = TestAsyncReq String

39+testServerMessageHandler :: Maybe (MVar String) -> TestRequest -> IO (HandlerResponse TestResponse)

42− deriving (Generic, Show)

40+testServerMessageHandler mAsyncMVar msg = do

43− deriving Serialise via WineryVariant TestAsyncReq

41+ --print msg

44−

42+ case msg of

45−data DelayMicrosecondsReq = DelayMicrosecondsReq Int

43+ --round-trip request to add two Ints

46− deriving (Generic, Show)

47− deriving Serialise via WineryVariant DelayMicrosecondsReq

48−

49−data RoundtripStringReq = RoundtripStringReq String

50− deriving (Generic, Show)

51− deriving Serialise via WineryVariant RoundtripStringReq

52−

53−data ThrowServerSideExceptionReq = ThrowServerSideExceptionReq

54− deriving (Generic, Show)

55− deriving Serialise via WineryVariant ThrowServerSideExceptionReq

56−

57−data ChangeServerState = ChangeServerState

58− deriving (Generic, Show)

59− deriving Serialise via WineryVariant ChangeServerState

60−

61−--used to server -> client async request

62−data AsyncHelloReq = AsyncHelloReq String

63− deriving (Generic, Show)

64− deriving Serialise via WineryVariant AsyncHelloReq

65−

66−data ThrowTimeout = ThrowTimeout

67− deriving (Generic, Show)

68− deriving Serialise via WineryVariant ThrowTimeout

69−

70−testServerRequestHandlers :: Maybe (MVar String) -> RequestHandlers ()

71−testServerRequestHandlers mAsyncMVar =

72− [ RequestHandler $ \_ (AddTwoNumbersReq x y) -> pure (x + y)

44+ AddTwoNumbersReq x y -> pure (HandlerResponse (AddTwoNumbersResp (x+y)))

45+ --respond to a request for an async callback

73− , RequestHandler $ \_ (TestCallMeBackReq s) ->

46+ TestCallMeBackReq s -> do

74− case mAsyncMVar of

47+ case mAsyncMVar of

75− Nothing -> pure ()

48+ Nothing -> pure ()

76− Just mvar -> putMVar mvar s

49+ Just mvar -> putMVar mvar s

77− , AsyncRequestHandler $ \_ (TestAsyncReq v) ->

50+ pure NoResponse

78− maybe (pure ()) (\mvar -> putMVar mvar v) mAsyncMVar

51+ TestAsyncReq _ -> pure NoResponse

79− -- an async hello to the server generates an async hello to the client

80− , AsyncRequestHandler $ \sState (AsyncHelloReq s) -> do

81− sendMessage (connectionSocket sState) (AsyncHelloReq s)

82−

83− , RequestHandler $ \_ (RoundtripStringReq s) -> pure s

84− , RequestHandler $ \_ (DelayMicrosecondsReq ms) -> do

52+ DelayMicrosecondsReq ms -> do

85 threadDelay ms

53 threadDelay ms

86− pure ()

54+ pure (HandlerResponse DelayMicrosecondsResp)

87− , RequestHandler $ \_ ThrowServerSideExceptionReq -> do

88− _ <- error "test server exception"

89− pure ()

90− ]

92-- test a simple client-to-server round-trip function execution

56-- test a simple client-to-server round-trip function execution

93testSimpleCall :: Assertion

57testSimpleCall :: Assertion

94testSimpleCall = do

58testSimpleCall = do

95 readyVar <- newEmptyMVar

59 readyVar <- newEmptyMVar

97− server <- async (serve (testServerRequestHandlers Nothing) emptyServerState localHostAddr 0 (Just readyVar))

61+ server <- async (serve (pure Nothing) (testServerMessageHandler Nothing) localHostAddr 0 (Just readyVar))

98 --wait for server to be ready

62 --wait for server to be ready

99 (SockAddrInet port _) <- takeMVar readyVar

63 (SockAddrInet port _) <- takeMVar readyVar

64+ let clientHandler :: AsyncMessageHandler TestResponse

65+ clientHandler _ = error "async handler called"

66+ mkConn :: IO (Connection TestResponse)

100− conn <- connect [] localHostAddr port

67+ mkConn = connect clientHandler localHostAddr port

68+ conn <- mkConn

69+ let c :: IO (Either ConnectionError TestResponse)

70+ c = call conn (AddTwoNumbersReq 1 1)

101 replicateM_ 5 $ do --make five AddTwo calls to shake out parallelism bugs

71 replicateM_ 5 $ do --make five AddTwo calls to shake out parallelism bugs

102− x <- call conn (AddTwoNumbersReq 1 1)

72+ x <- c

103− assertEqual "server request+response" (Right (2 :: Int)) x

73+ assertEqual "server request+response" (Right (AddTwoNumbersResp 2)) x

104 close conn

74 close conn

105 cancel server

75 cancel server

106

107−

108--test that the client can proces a server-initiated asynchronous callback from the server

77--test that the client can proces a server-initiated asynchronous callback from the server

109testAsyncServerCall :: Assertion

78testAsyncServerCall :: Assertion

110testAsyncServerCall = do

79testAsyncServerCall = do

111 portReadyVar <- newEmptyMVar

80 portReadyVar <- newEmptyMVar

112 receivedAsyncMessageVar <- newEmptyMVar

81 receivedAsyncMessageVar <- newEmptyMVar

113− let clientAsyncHandlers =

82+

114− [ClientAsyncRequestHandler (\(AsyncHelloReq s) ->

83+ let testServerNewConnHandler :: NewConnectionHandler TestResponse

115− putMVar receivedAsyncMessageVar s)]

84+ testServerNewConnHandler = do

85+ pure (Just (AsyncHello "welcome"))

86+

116− server <- async (serve (testServerRequestHandlers (Just receivedAsyncMessageVar)) emptyServerState localHostAddr 0 (Just portReadyVar))

87+ server <- async (serve testServerNewConnHandler (testServerMessageHandler Nothing) localHostAddr 0 (Just portReadyVar))

117 (SockAddrInet port _) <- takeMVar portReadyVar

88 (SockAddrInet port _) <- takeMVar portReadyVar

89+ let clientHandler :: AsyncMessageHandler TestResponse

90+ clientHandler msg = do

91+ case msg of

92+ AsyncHello str -> putMVar receivedAsyncMessageVar str

93+ x -> error ("unexpected message " <> show x)

118− conn <- connect clientAsyncHandlers localHostAddr port

94+ conn <- connect @TestResponse clientHandler localHostAddr port

119− Right () <- asyncCall conn (AsyncHelloReq "welcome")

120 asyncMessage <- takeMVar receivedAsyncMessageVar

95 asyncMessage <- takeMVar receivedAsyncMessageVar

121 assertEqual "async message" "welcome" asyncMessage

96 assertEqual "async message" "welcome" asyncMessage

122 close conn

97 close conn

123 cancel server

98 cancel server

124

125−

126−emptyServerState :: ()

127−emptyServerState = ()

128−

129--test that the client can make a non-blocking call

100--test that the client can make a non-blocking call

130testAsyncClientCall :: Assertion

101testAsyncClientCall :: Assertion

131testAsyncClientCall = do

102testAsyncClientCall = do

132 portReadyVar <- newEmptyMVar

103 portReadyVar <- newEmptyMVar

133 receivedAsyncMessageVar <- newEmptyMVar

104 receivedAsyncMessageVar <- newEmptyMVar

134

105

135− server <- async (serve (testServerRequestHandlers (Just receivedAsyncMessageVar)) emptyServerState localHostAddr 0 (Just portReadyVar))

106+ server <- async (serve (pure Nothing) (testServerMessageHandler (Just receivedAsyncMessageVar)) localHostAddr 0 (Just portReadyVar))

136 (SockAddrInet port _) <- takeMVar portReadyVar

107 (SockAddrInet port _) <- takeMVar portReadyVar

137−

108+

138− conn <- connect [] localHostAddr port

109+ conn <- connect @TestResponse (\_ -> pure ()) localHostAddr port

139 --send an async message, wait for an async response to confirm receipt

110 --send an async message, wait for an async response to confirm receipt

140 Right () <- asyncCall conn (TestCallMeBackReq "hi server")

111 Right () <- asyncCall conn (TestCallMeBackReq "hi server")

141 asyncMessage <- takeMVar receivedAsyncMessageVar

112 asyncMessage <- takeMVar receivedAsyncMessageVar

@@ -147,82 +118,18 @@ testSyncClientCallTimeout :: Assertion

147testSyncClientCallTimeout = do

118testSyncClientCallTimeout = do

148 readyVar <- newEmptyMVar

119 readyVar <- newEmptyMVar

149

120

150− server <- async (serve (testServerRequestHandlers Nothing) emptyServerState localHostAddr 0 (Just readyVar))

121+ server <- async (serve (pure Nothing) (testServerMessageHandler Nothing) localHostAddr 0 (Just readyVar))

151 --wait for server to be ready

122 --wait for server to be ready

152 (SockAddrInet port _) <- takeMVar readyVar

123 (SockAddrInet port _) <- takeMVar readyVar

124+ let clientHandler :: AsyncMessageHandler TestResponse

125+ clientHandler _ = error "async handler called"

126+ mkConn :: IO (Connection TestResponse)

153− conn <- connect [] localHostAddr port

127+ mkConn = connect clientHandler localHostAddr port

128+ conn <- mkConn

129+ let c :: IO (Either ConnectionError TestResponse)

154− x <- callTimeout @_ @Int (Just 500) conn (DelayMicrosecondsReq 1000)

130+ c = callTimeout (Just 500) conn (DelayMicrosecondsReq 1000)

131+ x <- c

155 assertEqual "client sync timeout" (Left TimeoutError) x

132 assertEqual "client sync timeout" (Left TimeoutError) x

156 close conn

133 close conn

157 cancel server

134 cancel server

158−

159−testSyncException :: Assertion

160−testSyncException = do

161− readyVar <- newEmptyMVar

162−

163− server <- async (serve (testServerRequestHandlers Nothing) emptyServerState localHostAddr 0 (Just readyVar))

164− (SockAddrInet port _) <- takeMVar readyVar

165−

166− conn <- connect [] localHostAddr port

167− ret <- call conn ThrowServerSideExceptionReq

168− case ret of

169− Left (ExceptionError actualExc) ->

170− assertBool "server-side exception" ("test server exception" `isPrefixOf` actualExc)

171− Left otherErr ->

172− assertFailure ("server-side error " <> show otherErr)

173− Right () -> assertFailure "missed exception"

174− close conn

175− cancel server

176−

177−--throw large messages (> PIPE_BUF) at the server from multiple client connections to exercise the socket lock

178−testMultithreadedClient :: Assertion

179−testMultithreadedClient = do

180− readyVar <- newEmptyMVar

181−

182− server <- async (serve (testServerRequestHandlers Nothing) emptyServerState localHostAddr 0 (Just readyVar))

183− (SockAddrInet port _) <- takeMVar readyVar

184− conn <- connect [] localHostAddr port

185− let bigString = replicate (1024 * 1000) 'x'

186− replicateM_ 10 $ do

187− ret <- call conn (RoundtripStringReq bigString)

188− assertEqual "big string multithread" (Right bigString) ret

189− --putStrLn "plus one"

190− close conn

191− cancel server

192−

193−testServerState :: Assertion

194−testServerState = do

195− readyVar <- newEmptyMVar

196−

197− let serverHandlers = [RequestHandler (\sState ChangeServerState ->

198− atomically $

199− modifyTVar (connectionServerState sState) (+ 1))

200− ]

201− serverState <- newTVarIO @Int 1

202− server <- async (serve serverHandlers serverState localHostAddr 0 (Just readyVar))

203− (SockAddrInet port _) <- takeMVar readyVar

204− conn <- connect [] localHostAddr port

205− ret <- call conn ChangeServerState

206− assertEqual "server ret" (Right ()) ret

207− serverState' <- readTVarIO serverState

208− assertEqual "server state" 2 serverState'

209− close conn

210− cancel server

211−

212−--test that the request handler can throw a TimeoutError exception which is converted into a TimeoutError response

213−testRequestHandlerThrowTimeout :: Assertion

214−testRequestHandlerThrowTimeout = do

215− readyVar <- newEmptyMVar

216−

217− let serverHandlers = [RequestHandler (\_ ThrowTimeout ->

218− throw TimeoutException >> pure (1 :: Int)

219− )

220− ]

221− server <- async (serve serverHandlers () localHostAddr 0 (Just readyVar))

222− (SockAddrInet port _) <- takeMVar readyVar

223− conn <- connect [] localHostAddr port

224− ret <- call @_ @Int conn ThrowTimeout

225− assertEqual "handler timeout exception" (Left TimeoutError) ret

226− close conn

227− cancel server

228

135