Channel options: user agents and compression (#32)

* get_peer: fix todo

* add documentation for server registered call function

* test roundtrip conversion of larger bytestrings (32 mb)

* Add channel args interface: currently supports user agents and compression.

* fix build failure after stack clean

cbits/grpc_haskell.c

@@ -2,6 +2,7 @@
 #include <grpc/byte_buffer.h>
 #include <grpc/byte_buffer_reader.h>
 #include <grpc/impl/codegen/grpc_types.h>
+#include <grpc/impl/codegen/compression_types.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -408,3 +409,50 @@ void* grpc_server_register_method_(grpc_server* server, const char* method,
                                      GRPC_SRM_PAYLOAD_READ_INITIAL_BYTE_BUFFER,
                                      0);
 }
+
+grpc_arg* create_arg_array(size_t n){
+  return malloc(sizeof(grpc_arg)*n);
+}
+
+//Converts our enum into real GRPC #defines. c2hs workaround.
+char* translate_arg_key(enum supported_arg_key key){
+  switch (key) {
+    case compression_algorithm_key:
+      return GRPC_COMPRESSION_ALGORITHM_ARG;
+    case user_agent_prefix_key:
+      return GRPC_ARG_PRIMARY_USER_AGENT_STRING;
+    case user_agent_suffix_key:
+      return GRPC_ARG_SECONDARY_USER_AGENT_STRING;
+    default:
+      return "unknown_arg_key";
+  }
+}
+
+void create_string_arg(grpc_arg* args, size_t i,
+                       enum supported_arg_key key, char* value){
+  grpc_arg* arg = args+i;
+  arg->type = GRPC_ARG_STRING;
+  arg->key = translate_arg_key(key);
+  char* storeValue = malloc(sizeof(char)*strlen(value));
+  arg->value.string = strcpy(storeValue, value);
+}
+
+void create_int_arg(grpc_arg* args, size_t i,
+                    enum supported_arg_key key, int value){
+  grpc_arg* arg = args+i;
+  arg->type = GRPC_ARG_INTEGER;
+  arg->key = translate_arg_key(key);
+  arg->value.integer = value;
+}
+
+//Destroys an arg array of the given length. NOTE: the args in the arg array
+//MUST have been created by the create_*_arg functions above!
+void destroy_arg_array(grpc_arg* args, size_t n){
+  for(int i = 0; i < n; i++){
+    grpc_arg* arg = args+i;
+    if(arg->type == GRPC_ARG_STRING){
+      free(arg->value.string);
+    }
+  }
+  free(args);
+}

examples/echo/echo-client/Main.hs

@@ -16,7 +16,7 @@ registered c = do
   meth <- clientRegisterMethod c echoMethod Normal
   clientRequest c meth 1 "hi" mempty
 
-run f = withGRPC $ \g -> withClient g (ClientConfig "localhost" 50051) $ \c ->
+run f = withGRPC $ \g -> withClient g (ClientConfig "localhost" 50051 []) $ \c ->
   f c >>= \case
     Left e -> error $ "Got client error: " ++ show e
     _      -> return ()

examples/echo/echo-server/Main.hs

@@ -24,7 +24,7 @@ handler U.ServerCall{..} reqBody = do
 
 unregMain :: IO ()
 unregMain = withGRPC $ \grpc -> do
-  withServer grpc (ServerConfig "localhost" 50051 []) $ \server -> forever $ do
+  withServer grpc (ServerConfig "localhost" 50051 [] []) $ \server -> forever $ do
     result <- U.serverHandleNormalCall server serverMeta handler
     case result of
       Left x -> putStrLn $ "handle call result error: " ++ show x
@@ -33,7 +33,7 @@ unregMain = withGRPC $ \grpc -> do
 regMain :: IO ()
 regMain = withGRPC $ \grpc -> do
   let methods = [(MethodName "/echo.Echo/DoEcho", Normal)]
-  withServer grpc (ServerConfig "localhost" 50051 methods) $ \server ->
+  withServer grpc (ServerConfig "localhost" 50051 methods []) $ \server ->
     forever $ do
       let method = head (registeredMethods server)
       result <- serverHandleNormalCall server method serverMeta $
@@ -57,7 +57,7 @@ regMainThreaded :: IO ()
 regMainThreaded = do
   withGRPC $ \grpc -> do
     let methods = [(MethodName "/echo.Echo/DoEcho", Normal)]
-    withServer grpc (ServerConfig "localhost" 50051 methods) $ \server -> do
+    withServer grpc (ServerConfig "localhost" 50051 methods []) $ \server -> do
       let method = head (registeredMethods server)
       tid1 <- async $ regLoop server method
       tid2 <- async $ regLoop server method

grpc-haskell.cabal

@@ -37,6 +37,7 @@ library
     Network.GRPC.Unsafe.Constants
     Network.GRPC.Unsafe.Time
     Network.GRPC.Unsafe.Slice
+    Network.GRPC.Unsafe.ChannelArgs
     Network.GRPC.Unsafe.ByteBuffer
     Network.GRPC.Unsafe.Metadata
     Network.GRPC.Unsafe.Op

include/grpc_haskell.h

@@ -140,4 +140,23 @@ gpr_timespec* call_details_get_deadline(grpc_call_details* details);
 void* grpc_server_register_method_(grpc_server* server, const char* method,
                                    const char* host);
 
+//c2hs doesn't support #const pragmas referring to #define'd strings, so we use
+//this enum as a workaround. These are converted into actual GRPC #defines in
+// translate_arg_key in grpc_haskell.c.
+enum supported_arg_key {
+  compression_algorithm_key = 0,
+  user_agent_prefix_key,
+  user_agent_suffix_key
+};
+
+grpc_arg* create_arg_array(size_t n);
+
+void create_string_arg(grpc_arg* args, size_t i,
+                       enum supported_arg_key key, char* value);
+
+void create_int_arg(grpc_arg* args, size_t i,
+                    enum supported_arg_key key, int value);
+
+void destroy_arg_array(grpc_arg* args, size_t n);
+
 #endif //GRPC_HASKELL

src/Network/GRPC/LowLevel.hs

@@ -26,6 +26,10 @@ GRPC
 , MethodName(..)
 , StatusDetails(..)
 
+-- * Configuration options
+, Arg(..)
+, CompressionAlgorithm(..)
+
 -- * Server
 , ServerConfig(..)
 , Server
@@ -64,3 +68,4 @@ import           Network.GRPC.LowLevel.Call
 
 import Network.GRPC.Unsafe (ConnectivityState(..))
 import Network.GRPC.Unsafe.Op (StatusCode(..))
+import Network.GRPC.Unsafe.ChannelArgs(Arg(..), CompressionAlgorithm(..))

src/Network/GRPC/LowLevel/Client.hs

@@ -10,10 +10,12 @@ import           Control.Monad                         (join)
 import           Data.ByteString                       (ByteString)
 import           Foreign.Ptr                           (nullPtr)
 import qualified Network.GRPC.Unsafe                   as C
+import qualified Network.GRPC.Unsafe.ChannelArgs       as C
 import qualified Network.GRPC.Unsafe.Constants         as C
 import qualified Network.GRPC.Unsafe.Op                as C
 import qualified Network.GRPC.Unsafe.Time              as C
 
+
 import           Network.GRPC.LowLevel.Call
 import           Network.GRPC.LowLevel.CompletionQueue
 import           Network.GRPC.LowLevel.GRPC
@@ -27,17 +29,24 @@ data Client = Client {clientChannel :: C.Channel,
 
 -- | Configuration necessary to set up a client.
 data ClientConfig = ClientConfig {serverHost :: Host,
-                                  serverPort :: Port}
+                                  serverPort :: Port,
+                                  clientArgs :: [C.Arg]
+                                  -- ^ Optional arguments for setting up the
+                                  -- channel on the client. Supplying an empty
+                                  -- list will cause the channel to use gRPC's
+                                  -- default options.
+                                 }
 
 clientEndpoint :: ClientConfig -> Endpoint
 clientEndpoint ClientConfig{..} = endpoint serverHost serverPort
 
 createClient :: GRPC -> ClientConfig -> IO Client
-createClient grpc clientConfig = do
-  let Endpoint e = clientEndpoint clientConfig
-  clientChannel <- C.grpcInsecureChannelCreate e nullPtr C.reserved
-  clientCQ <- createCompletionQueue grpc
-  return Client{..}
+createClient grpc clientConfig =
+  C.withChannelArgs (clientArgs clientConfig) $ \chanargs -> do
+    let Endpoint e = clientEndpoint clientConfig
+    clientChannel <- C.grpcInsecureChannelCreate e chanargs C.reserved
+    clientCQ <- createCompletionQueue grpc
+    return Client{..}
 
 destroyClient :: Client -> IO ()
 destroyClient Client{..} = do

src/Network/GRPC/LowLevel/Server.hs

@@ -22,6 +22,7 @@ import           Network.GRPC.LowLevel.GRPC
 import           Network.GRPC.LowLevel.Op
 import qualified Network.GRPC.Unsafe                   as C
 import qualified Network.GRPC.Unsafe.Op                as C
+import qualified Network.GRPC.Unsafe.ChannelArgs       as C
 
 -- | Wraps various gRPC state needed to run a server.
 data Server = Server
@@ -42,6 +43,11 @@ data ServerConfig = ServerConfig
     -- ^ List of (method name, method type) tuples specifying all methods to
     -- register. You can also handle other unregistered methods with
     -- `serverHandleNormalCall`.
+  , serverArgs :: [C.Arg]
+  -- ^ Optional arguments for setting up the
+  -- channel on the server. Supplying an empty
+  -- list will cause the channel to use gRPC's
+  -- default options.
   }
   deriving (Show, Eq)
 
@@ -49,18 +55,19 @@ serverEndpoint :: ServerConfig -> Endpoint
 serverEndpoint ServerConfig{..} = endpoint host port
 
 startServer :: GRPC -> ServerConfig -> IO Server
-startServer grpc conf@ServerConfig{..} = do
-  let e = serverEndpoint conf
-  server <- C.grpcServerCreate nullPtr C.reserved
-  actualPort <- C.grpcServerAddInsecureHttp2Port server (unEndpoint e)
-  when (actualPort /= unPort port) $
-    error $ "Unable to bind port: " ++ show port
-  cq <- createCompletionQueue grpc
-  serverRegisterCompletionQueue server cq
-  methods <- forM methodsToRegister $ \(name, mtype) ->
-               serverRegisterMethod server name e mtype
-  C.grpcServerStart server
-  return $ Server server cq methods conf
+startServer grpc conf@ServerConfig{..} =
+  C.withChannelArgs serverArgs $ \args -> do
+    let e = serverEndpoint conf
+    server <- C.grpcServerCreate args C.reserved
+    actualPort <- C.grpcServerAddInsecureHttp2Port server (unEndpoint e)
+    when (actualPort /= unPort port) $
+      error $ "Unable to bind port: " ++ show port
+    cq <- createCompletionQueue grpc
+    serverRegisterCompletionQueue server cq
+    methods <- forM methodsToRegister $ \(name, mtype) ->
+                 serverRegisterMethod server name e mtype
+    C.grpcServerStart server
+    return $ Server server cq methods conf
 
 stopServer :: Server -> IO ()
 -- TODO: Do method handles need to be freed?

src/Network/GRPC/Unsafe.chs

@@ -5,6 +5,7 @@ module Network.GRPC.Unsafe where
 import Control.Exception (bracket)
 import Control.Monad
 
+import Foreign.C.String (CString, peekCString)
 import Foreign.C.Types
 import Foreign.Marshal.Alloc (free)
 import Foreign.Ptr
@@ -15,9 +16,11 @@ import Network.GRPC.Unsafe.Constants
 {#import Network.GRPC.Unsafe.ByteBuffer#}
 {#import Network.GRPC.Unsafe.Op#}
 {#import Network.GRPC.Unsafe.Metadata#}
+{#import Network.GRPC.Unsafe.ChannelArgs#}
 
 #include <grpc/grpc.h>
 #include <grpc/status.h>
+#include <grpc/impl/codegen/alloc.h>
 #include <grpc_haskell.h>
 
 {#context prefix = "grpc" #}
@@ -58,17 +61,6 @@ instance Storable Call where
   peek p = fmap Call (peek (castPtr p))
   poke p (Call r) = poke (castPtr p) r
 
--- {#enum grpc_arg_type as ArgType {underscoreToCase} deriving (Eq)#}
-
-newtype ChannelArgs = ChannelArgs [Arg]
-
--- TODO Storable ChannelArgs
-
-{#pointer *grpc_channel_args as ChannelArgsPtr -> ChannelArgs #}
-
-data Arg = Arg { argKey :: String, argValue :: ArgValue }
-data ArgValue = ArgString String | ArgInt Int
-
 -- | A 'Tag' is an identifier that is used with a 'CompletionQueue' to signal
 -- that the corresponding operation has completed.
 newtype Tag = Tag {unTag :: Ptr ()} deriving (Show, Eq)
@@ -184,7 +176,7 @@ castPeek p = do
 -- expose any functions for creating channel args, since they are entirely
 -- undocumented.
 {#fun grpc_insecure_channel_create as ^
-  {`String', `ChannelArgsPtr',unReserved `Reserved'} -> `Channel'#}
+  {`String', `GrpcChannelArgs', unReserved `Reserved'} -> `Channel'#}
 
 {#fun grpc_channel_register_call as ^
   {`Channel', `String', `String',unReserved `Reserved'}
@@ -226,13 +218,21 @@ castPeek p = do
 
 {#fun grpc_call_destroy as ^ {`Call'} -> `()'#}
 
---TODO: we need to free this string with gpr_free!
-{#fun grpc_call_get_peer as ^ {`Call'} -> `String' #}
+-- | Gets the peer of the current call as a string.
+{#fun grpc_call_get_peer as ^ {`Call'} -> `String' getPeerPeek* #}
+
+{#fun gpr_free as ^ {`Ptr ()'} -> `()'#}
+
+getPeerPeek :: CString -> IO String
+getPeerPeek cstr = do
+  haskellStr <- peekCString cstr
+  gprFree (castPtr cstr)
+  return haskellStr
 
 -- Server stuff
 
 {#fun grpc_server_create as ^
-  {`ChannelArgsPtr',unReserved `Reserved'} -> `Server'#}
+  {`GrpcChannelArgs',unReserved `Reserved'} -> `Server'#}
 
 {#fun grpc_server_register_method_ as ^
   {`Server', `String', `String'} -> `CallHandle' CallHandle#}
@@ -269,7 +269,9 @@ castPeek p = do
    `CompletionQueue', `CompletionQueue',unTag `Tag'}
   -> `CallError'#}
 
--- | TODO: I am not yet sure how this function is supposed to be used.
+-- | Request a registered call for the given registered method described by a
+-- 'CallHandle'. The call, deadline, metadata array, and byte buffer are all
+-- out parameters.
 {#fun grpc_server_request_registered_call as ^
   {`Server',unCallHandle `CallHandle',id `Ptr Call', `CTimeSpecPtr',
    `MetadataArray', id `Ptr ByteBuffer', `CompletionQueue',

src/Network/GRPC/Unsafe/ByteBuffer.chs

@@ -10,15 +10,13 @@ module Network.GRPC.Unsafe.ByteBuffer where
 #include <grpc_haskell.h>
 
 {#import Network.GRPC.Unsafe.Slice#}
+{#import Network.GRPC.Unsafe.ChannelArgs#}
 import Control.Exception (bracket)
 import qualified Data.ByteString as B
 import Foreign.Ptr
 import Foreign.C.Types
 import Foreign.Storable
 
-{#enum grpc_compression_algorithm as GRPCCompressionAlgorithm
-  {underscoreToCase} deriving (Eq) #}
-
 -- | Represents a pointer to a gRPC byte buffer containing 1 or more 'Slice's.
 -- Must be destroyed manually with 'grpcByteBufferDestroy'.
 {#pointer *grpc_byte_buffer as ByteBuffer newtype #}
@@ -56,7 +54,7 @@ withByteBufferPtr
 {#fun grpc_raw_byte_buffer_create as ^ {`Slice', `CULong'} -> `ByteBuffer'#}
 
 {#fun grpc_raw_compressed_byte_buffer_create as ^
-  {`Slice', `CULong', `GRPCCompressionAlgorithm'} -> `ByteBuffer'#}
+  {`Slice', `CULong', `CompressionAlgorithm'} -> `ByteBuffer'#}
 
 {#fun grpc_byte_buffer_copy as ^ {`ByteBuffer'} -> `ByteBuffer'#}
 
@@ -78,7 +76,6 @@ withByteBufferPtr
 {#fun grpc_raw_byte_buffer_from_reader as ^
   {`ByteBufferReader'} -> `ByteBuffer'#}
 
--- TODO: Issue #5
 withByteStringAsByteBuffer :: B.ByteString -> (ByteBuffer -> IO a) -> IO a
 withByteStringAsByteBuffer bs f = do
   bracket (byteStringToSlice bs) freeSlice $ \slice -> do

src/Network/GRPC/Unsafe/ChannelArgs.chs

@@ -0,0 +1,85 @@
+{-# LANGUAGE RecordWildCards #-}
+
+module Network.GRPC.Unsafe.ChannelArgs where
+
+import Control.Exception
+import Control.Monad
+import Foreign.Storable
+import Foreign.Ptr (nullPtr)
+import Foreign.Marshal.Alloc (malloc, free)
+
+#include <grpc/grpc.h>
+#include <grpc/status.h>
+#include <grpc/impl/codegen/alloc.h>
+#include <grpc/impl/codegen/compression_types.h>
+#include <grpc_haskell.h>
+
+{#enum supported_arg_key as ArgKey {underscoreToCase} deriving (Show, Eq)#}
+
+{#enum grpc_compression_algorithm
+  as CompressionAlgorithm {underscoreToCase} deriving (Show, Eq)#}
+
+{#enum grpc_compression_level
+  as CompressionLevel {underscoreToCase} deriving (Show, Eq)#}
+
+{#pointer *grpc_arg as ^#}
+
+data ChannelArgs = ChannelArgs {channelArgsN :: Int,
+                                channelArgsArray :: GrpcArg}
+  deriving (Show, Eq)
+
+{#pointer *grpc_channel_args as ^ -> ChannelArgs#}
+
+instance Storable ChannelArgs where
+  sizeOf _ = {#sizeof grpc_channel_args#}
+  alignment _ = {#alignof grpc_channel_args#}
+  peek p = ChannelArgs <$> fmap fromIntegral
+                                ({#get grpc_channel_args->num_args#} p)
+                       <*> ({#get grpc_channel_args->args#} p)
+  poke p ChannelArgs{..} = do
+    {#set grpc_channel_args.num_args#} p $ fromIntegral channelArgsN
+    {#set grpc_channel_args.args#} p channelArgsArray
+
+{#fun create_arg_array as ^ {`Int'} -> `GrpcArg'#}
+
+data ArgValue = StringArg String | IntArg Int
+  deriving (Show, Eq)
+
+-- | Supported arguments for a channel. More cases will be added as we figure
+-- out what they are.
+data Arg = CompressionAlgArg CompressionAlgorithm
+           | UserAgentPrefix String
+           | UserAgentSuffix String
+  deriving (Show, Eq)
+
+{#fun create_string_arg as ^ {`GrpcArg', `Int', `ArgKey', `String'} -> `()'#}
+
+{#fun create_int_arg as ^ {`GrpcArg', `Int', `ArgKey', `Int'} -> `()'#}
+
+{#fun destroy_arg_array as ^ {`GrpcArg', `Int'} -> `()'#}
+
+createArg :: GrpcArg -> Arg -> Int -> IO ()
+createArg array (CompressionAlgArg alg) i =
+  createIntArg array i CompressionAlgorithmKey (fromEnum alg)
+createArg array (UserAgentPrefix prefix) i =
+  createStringArg array i UserAgentPrefixKey prefix
+createArg array (UserAgentSuffix suffix) i =
+  createStringArg array i UserAgentSuffixKey suffix
+
+createChannelArgs :: [Arg] -> IO GrpcChannelArgs
+createChannelArgs args = do
+  let l = length args
+  array <- createArgArray l
+  forM_ (zip [0..l] args) $ \(i, arg) -> createArg array arg i
+  ptr <- malloc
+  poke ptr $ ChannelArgs l array
+  return ptr
+
+destroyChannelArgs :: GrpcChannelArgs -> IO ()
+destroyChannelArgs ptr =
+  do ChannelArgs{..} <- peek ptr
+     destroyArgArray channelArgsArray channelArgsN
+     free ptr
+
+withChannelArgs :: [Arg] -> (GrpcChannelArgs -> IO a) -> IO a
+withChannelArgs args f = bracket (createChannelArgs args) destroyChannelArgs f

src/Network/GRPC/Unsafe/Constants.hsc

@@ -4,6 +4,7 @@ module Network.GRPC.Unsafe.Constants where
 
 #include "grpc/grpc.h"
 #include "grpc/impl/codegen/propagation_bits.h"
+#include "grpc/impl/codegen/compression_types.h"
 
 argEnableCensus :: Int
 argEnableCensus = #const GRPC_ARG_ENABLE_CENSUS

tests/LowLevelTests.hs

@@ -8,7 +8,9 @@ module LowLevelTests where
 import           Control.Concurrent                        (threadDelay)
 import           Control.Concurrent.Async
 import           Control.Monad
-import           Data.ByteString                           (ByteString)
+import           Data.ByteString                           (ByteString,
+                                                            isPrefixOf,
+                                                            isSuffixOf)
 import qualified Data.Map                                  as M
 import           Network.GRPC.LowLevel
 import qualified Network.GRPC.LowLevel.Call.Unregistered   as U
@@ -37,6 +39,9 @@ lowLevelTests = testGroup "Unit tests of low-level Haskell library"
   , testGoaway
   , testSlowServer
   , testServerCallExpirationCheck
+  , testCustomUserAgent
+  , testClientCompression
+  , testClientServerCompression
   ]
 
 testGRPCBracket :: TestTree
@@ -204,7 +209,7 @@ testSlowServer =
       let rm = head (registeredMethods s)
       serverHandleNormalCall s rm mempty $ \_ _ _ -> do
         threadDelay (2*10^(6 :: Int))
-        return ("", mempty, StatusOk, StatusDetails "")
+        return dummyResp
       return ()
 
 testServerCallExpirationCheck :: TestTree
@@ -226,7 +231,73 @@ testServerCallExpirationCheck =
         threadDelaySecs 3
         exp3 <- serverCallIsExpired c
         assertBool "Call is expired after 4 seconds" exp3
-        return ("", mempty, StatusCancelled, StatusDetails "")
+        return dummyResp
+      return ()
+
+testCustomUserAgent :: TestTree
+testCustomUserAgent =
+  csTest' "Server sees custom user agent prefix/suffix" client server
+  where
+    clientArgs = [UserAgentPrefix "prefix!", UserAgentSuffix "suffix!"]
+    client =
+      TestClient (ClientConfig "localhost" 50051 clientArgs) $
+        \c -> do rm <- clientRegisterMethod c "/foo" Normal
+                 result <- clientRequest c rm 4 "" mempty
+                 return ()
+    server = TestServer (stdServerConf [("/foo", Normal)]) $ \s -> do
+      let rm = head (registeredMethods s)
+      serverHandleNormalCall s rm mempty $ \_ _ meta -> do
+        let ua = meta M.! "user-agent"
+        assertBool "User agent prefix is present" $ isPrefixOf "prefix!" ua
+        assertBool "User agent suffix is present" $ isSuffixOf "suffix!" ua
+        return dummyResp
+      return ()
+
+testClientCompression :: TestTree
+testClientCompression =
+  csTest' "client-only compression: no errors" client server
+  where
+    client =
+      TestClient (ClientConfig
+                   "localhost"
+                   50051
+                   [CompressionAlgArg GrpcCompressDeflate]) $ \c -> do
+        rm <- clientRegisterMethod c "/foo" Normal
+        result <- clientRequest c rm 1 "hello" mempty
+        return ()
+    server = TestServer (stdServerConf [("/foo", Normal)]) $ \s -> do
+      let rm = head (registeredMethods s)
+      serverHandleNormalCall s rm mempty $ \c body _ -> do
+        body @?= "hello"
+        return dummyResp
+      return ()
+
+testClientServerCompression :: TestTree
+testClientServerCompression =
+  csTest' "client/server compression: no errors" client server
+  where
+    cconf = ClientConfig "localhost"
+                         50051
+                         [CompressionAlgArg GrpcCompressDeflate]
+    client = TestClient cconf $ \c -> do
+      rm <- clientRegisterMethod c "/foo" Normal
+      clientRequest c rm 1 "hello" mempty >>= do
+        checkReqRslt $ \NormalRequestResult{..} -> do
+          rspCode @?= StatusOk
+          rspBody @?= "hello"
+          details @?= ""
+          initMD  @?= Just dummyMeta
+          trailMD @?= dummyMeta
+      return ()
+    sconf = ServerConfig "localhost"
+                         50051
+                         [("/foo", Normal)]
+                         [CompressionAlgArg GrpcCompressDeflate]
+    server = TestServer sconf $ \s -> do
+      let rm = head (registeredMethods s)
+      serverHandleNormalCall s rm dummyMeta $ \c body _ -> do
+        body @?= "hello"
+        return ("hello", dummyMeta, StatusOk, StatusDetails "")
       return ()
 
 --------------------------------------------------------------------------------
@@ -235,9 +306,11 @@ testServerCallExpirationCheck =
 dummyMeta :: M.Map ByteString ByteString
 dummyMeta = [("foo","bar")]
 
+dummyResp = ("", mempty, StatusOk, StatusDetails "")
+
 dummyHandler :: ServerCall -> ByteString -> MetadataMap
                 -> IO (ByteString, MetadataMap, StatusCode, StatusDetails)
-dummyHandler _ _ _ = return ("", mempty, StatusOk, StatusDetails "")
+dummyHandler _ _ _ = return dummyResp
 
 unavailableStatus :: Either GRPCIOError a
 unavailableStatus =
@@ -302,7 +375,7 @@ stdTestClient :: (Client -> IO ()) -> TestClient
 stdTestClient = TestClient stdClientConf
 
 stdClientConf :: ClientConfig
-stdClientConf = ClientConfig "localhost" 50051
+stdClientConf = ClientConfig "localhost" 50051 []
 
 data TestServer = TestServer ServerConfig (Server -> IO ())
 
@@ -313,7 +386,7 @@ stdTestServer :: [(MethodName, GRPCMethodType)] -> (Server -> IO ()) -> TestServ
 stdTestServer = TestServer . stdServerConf
 
 stdServerConf :: [(MethodName, GRPCMethodType)] -> ServerConfig
-stdServerConf = ServerConfig "localhost" 50051
+stdServerConf xs = ServerConfig "localhost" 50051 xs []
 
 
 threadDelaySecs :: Int -> IO ()

tests/LowLevelTests/Op.hs

@@ -87,9 +87,9 @@ withClientServerUnaryCall grpc f = do
         withServerCall s srm $ \sc ->
           f (c, s, cc, sc)
 
-serverConf = (ServerConfig "localhost" 50051 [("/foo", Normal)])
+serverConf = ServerConfig "localhost" 50051 [("/foo", Normal)] []
 
-clientConf = (ClientConfig "localhost" 50051)
+clientConf = ClientConfig "localhost" 50051 []
 
 clientEmptySendOps = [OpSendInitialMetadata mempty,
                       OpSendMessage "",

tests/UnsafeTests.hs

@@ -16,6 +16,7 @@ import           Network.GRPC.Unsafe.Metadata
 import           Network.GRPC.Unsafe.Op
 import           Network.GRPC.Unsafe.Slice
 import           Network.GRPC.Unsafe.Time
+import           Network.GRPC.Unsafe.ChannelArgs
 import           Test.Tasty
 import           Test.Tasty.HUnit               as HU (testCase, (@?=))
 
@@ -23,14 +24,20 @@ unsafeTests :: TestTree
 unsafeTests = testGroup "Unit tests for unsafe C bindings"
   [ roundtripSlice "Hello, world!"
   , roundtripByteBuffer "Hwaet! We gardena in geardagum..."
+  , roundtripSlice largeByteString
+  , roundtripByteBuffer largeByteString
   , testMetadata
   , testNow
   , testCreateDestroyMetadata
   , testCreateDestroyMetadataKeyVals
   , testCreateDestroyDeadline
   , testPayload
+  , testCreateDestroyChannelArgs
   ]
 
+largeByteString :: B.ByteString
+largeByteString = B.pack $ take (32*1024*1024) $ cycle [97..99]
+
 roundtripSlice :: B.ByteString -> TestTree
 roundtripSlice bs = testCase "ByteString slice roundtrip" $ do
   slice <- byteStringToSlice bs
@@ -98,6 +105,11 @@ testCreateDestroyDeadline :: TestTree
 testCreateDestroyDeadline = testCase "Create/destroy deadline" $ do
   grpc $ withDeadlineSeconds 10 $ const $ return ()
 
+testCreateDestroyChannelArgs :: TestTree
+testCreateDestroyChannelArgs = testCase "Create/destroy channel args" $
+  grpc $ withChannelArgs [CompressionAlgArg GrpcCompressDeflate] $
+  const $ return ()
+
 assertCqEventComplete :: Event -> IO ()
 assertCqEventComplete e = do
   eventCompletionType e HU.@?= OpComplete