MONAPP-1369: Server options for generated code. (#76)

* add ServiceOptions for generated servers

* drop opt prefix in ServiceOptions fields

* add default options

* tweak exports, add docs

* re-export stuff from Generated so that users need don't need to import lots of modules

* remove threaded from library -- doesn't do anything

* add defaultServiceOptions export

* more exports

* export GRPCMethodType

grpc-haskell.cabal

@@ -85,7 +85,7 @@ library
     , grpc/impl/codegen/slice.h
   build-tools:          c2hs
   default-language:     Haskell2010
-  ghc-options:          -Wall -fwarn-incomplete-patterns -fno-warn-unused-do-bind -threaded
+  ghc-options:          -Wall -fwarn-incomplete-patterns -fno-warn-unused-do-bind
   include-dirs:         include
   hs-source-dirs:       src
   default-extensions:   CPP

src/Network/GRPC/HighLevel.hs

@@ -6,6 +6,9 @@ module Network.GRPC.HighLevel (
 , StatusDetails(..)
 , StatusCode(..)
 , GRPCIOError(..)
+, GRPCImpl(..)
+, MkHandler
+, ServiceOptions(..)
 
 -- * Server
 , Handler(..)
@@ -47,4 +50,5 @@ module Network.GRPC.HighLevel (
  where
 
 import           Network.GRPC.HighLevel.Server
+import           Network.GRPC.HighLevel.Generated
 import           Network.GRPC.LowLevel

src/Network/GRPC/HighLevel/Generated.hs

@@ -2,11 +2,39 @@
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE RankNTypes #-}
+{-# LANGUAGE OverloadedStrings #-}
 
-module Network.GRPC.HighLevel.Generated where
+module Network.GRPC.HighLevel.Generated (
+  -- * Types
+  MetadataMap(..)
+, MethodName(..)
+, GRPCMethodType(..)
+, GRPCImpl(..)
+, MkHandler
+, Host(..)
+, Port(..)
+, StatusDetails(..)
+, StatusCode(..)
+, GRPCIOError(..)
 
-import Network.GRPC.HighLevel.Server
-import Network.GRPC.LowLevel.Call
+  -- * Server
+, ServiceOptions(..)
+, defaultServiceOptions
+, ServerCall(..)
+, serverCallCancel
+, serverCallIsExpired
+, ServerRequest(..)
+, ServerResponse(..)
+
+  -- * Server Auth
+, ServerSSLConfig(..)
+)
+where
+
+import           Network.GRPC.HighLevel.Server
+import           Network.GRPC.LowLevel
+import           Network.GRPC.LowLevel.Call
+import           System.IO (hPutStrLn, stderr)
 
 -- | Used at the kind level as a parameter to service definitions
 --   generated by the grpc compiler, with the effect of having the
@@ -22,3 +50,37 @@ type instance MkHandler 'ServerImpl 'Normal          i o = ServerHandler       i
 type instance MkHandler 'ServerImpl 'ClientStreaming i o = ServerReaderHandler i o
 type instance MkHandler 'ServerImpl 'ServerStreaming i o = ServerWriterHandler i o
 type instance MkHandler 'ServerImpl 'BiDiStreaming   i o = ServerRWHandler     i o
+
+-- | Options for a service that was generated from a .proto file. This is
+-- essentially 'ServerOptions' with the handler fields removed.
+data ServiceOptions = ServiceOptions
+  { serverHost           :: Host
+    -- ^ Name of the host the server is running on.
+  , serverPort           :: Port
+    -- ^ Port on which to listen for requests.
+  , useCompression       :: Bool
+    -- ^ Whether to use compression when communicating with the client.
+  , userAgentPrefix      :: String
+    -- ^ Optional custom prefix to add to the user agent string.
+  , userAgentSuffix      :: String
+    -- ^ Optional custom suffix to add to the user agent string.
+  , initialMetadata      :: MetadataMap
+    -- ^ Metadata to send at the beginning of each call.
+  , sslConfig            :: Maybe ServerSSLConfig
+    -- ^ Security configuration.
+  , logger               :: String -> IO ()
+    -- ^ Logging function to use to log errors in handling calls.
+  }
+
+defaultServiceOptions :: ServiceOptions
+defaultServiceOptions = ServiceOptions
+  -- names are fully qualified because we use the same fields in LowLevel.
+  { Network.GRPC.HighLevel.Generated.serverHost      = "localhost"
+  , Network.GRPC.HighLevel.Generated.serverPort      = 50051
+  , Network.GRPC.HighLevel.Generated.useCompression  = False
+  , Network.GRPC.HighLevel.Generated.userAgentPrefix = "grpc-haskell/0.0.0"
+  , Network.GRPC.HighLevel.Generated.userAgentSuffix = ""
+  , Network.GRPC.HighLevel.Generated.initialMetadata = mempty
+  , Network.GRPC.HighLevel.Generated.sslConfig       = Nothing
+  , Network.GRPC.HighLevel.Generated.logger          = hPutStrLn stderr
+  }