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| Copyright (c) 2023-2024, Well-Typed LLP and Anduril Industries Inc. | ||
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| All rights reserved. | ||
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| Redistribution and use in source and binary forms, with or without | ||
| modification, are permitted provided that the following conditions are met: | ||
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| * Redistributions of source code must retain the above copyright | ||
| notice, this list of conditions and the following disclaimer. | ||
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| * Redistributions in binary form must reproduce the above | ||
| copyright notice, this list of conditions and the following | ||
| disclaimer in the documentation and/or other materials provided | ||
| with the distribution. | ||
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| * Neither the name of Well-Typed LLP, the name of Anduril | ||
| Industries Inc., nor the names of other contributors may be | ||
| used to endorse or promote products derived from this software | ||
| without specific prior written permission. | ||
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| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
| A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
| OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
| SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
| LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
| DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
| THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| # Basics tutorial | ||
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| See `/tutorials/basics` for the more direct `grapesy` translation of the | ||
| [official Basics tutorial](https://grpc.io/docs/languages/python/basics/). | ||
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| In this tutorial we re-implement both the server and the client using a | ||
| custom monad stack. |
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| import Data.ProtoLens.Setup | ||
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| main = defaultMainGeneratingProtos "proto" |
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| module Client (main) where | ||
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| import Control.Concurrent | ||
| import Control.Monad | ||
| import Control.Monad.Catch | ||
| import Control.Monad.Reader | ||
| import Data.Int | ||
| import Data.Text (Text) | ||
| import System.Random | ||
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| import Network.GRPC.Client | ||
| import Network.GRPC.Client.StreamType.CanCallRPC | ||
| import Network.GRPC.Common | ||
| import Network.GRPC.Common.NextElem qualified as NextElem | ||
| import Network.GRPC.Common.Protobuf | ||
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| import RouteGuide | ||
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| import Proto.API.RouteGuide | ||
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| {------------------------------------------------------------------------------- | ||
| Custom client monad | ||
| The only requirement here as far as @grapesy@ is concerned is that | ||
| -------------------------------------------------------------------------------} | ||
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| newtype Client a = WrapClient { | ||
| unwrapClient :: ReaderT ClientEnv IO a | ||
| } | ||
| deriving newtype ( | ||
| Functor | ||
| , Applicative | ||
| , Monad | ||
| , MonadIO | ||
| , MonadCatch | ||
| , MonadThrow | ||
| , MonadMask | ||
| ) | ||
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| data ClientEnv = ClientEnv { | ||
| conn :: Connection | ||
| } | ||
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| runClient :: Connection -> Client a -> IO a | ||
| runClient conn = flip runReaderT ClientEnv{conn} . unwrapClient | ||
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| instance CanCallRPC Client where | ||
| getConnection = WrapClient $ conn <$> ask | ||
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| {------------------------------------------------------------------------------- | ||
| Call each of the methods of the RouteGuide service | ||
| -------------------------------------------------------------------------------} | ||
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| getFeature :: Client () | ||
| getFeature = do | ||
| let req = defMessage | ||
| & #latitude .~ 409146138 | ||
| & #longitude .~ -746188906 | ||
| resp <- nonStreaming (rpc @(Protobuf RouteGuide "getFeature")) req | ||
| liftIO $ print resp | ||
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| listFeatures :: Client () | ||
| listFeatures = do | ||
| let lo = defMessage | ||
| & #latitude .~ 400000000 | ||
| & #longitude .~ -750000000 | ||
| hi = defMessage | ||
| & #latitude .~ 420000000 | ||
| & #longitude .~ -730000000 | ||
| req = defMessage | ||
| & #lo .~ lo | ||
| & #hi .~ hi | ||
| serverStreaming (rpc @(Protobuf RouteGuide "listFeatures")) req $ \recv -> liftIO $ | ||
| NextElem.whileNext_ recv print | ||
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| recordRoute :: Client () | ||
| recordRoute = do | ||
| db <- liftIO $ getDB | ||
| resp <- clientStreaming_ (rpc @(Protobuf RouteGuide "recordRoute")) $ \send -> liftIO $ do | ||
| replicateM_ 10 $ do | ||
| i <- randomRIO (0, length db - 1) | ||
| let p = (db !! i) ^. #location | ||
| send $ NextElem p | ||
| threadDelay 500_000 -- 0.5 seconds | ||
| send NoNextElem | ||
| liftIO $ print resp | ||
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| routeChat :: Client () | ||
| routeChat = do | ||
| biDiStreaming (rpc @(Protobuf RouteGuide "routeChat")) $ \send recv -> liftIO $ do | ||
| NextElem.forM_ messages send | ||
| NextElem.whileNext_ recv print | ||
| where | ||
| messages :: [Proto RouteNote] | ||
| messages = [ | ||
| makeRouteNote "First message" 0 0 | ||
| , makeRouteNote "Second message" 0 1 | ||
| , makeRouteNote "Third message" 1 0 | ||
| , makeRouteNote "Fourth message" 0 0 | ||
| , makeRouteNote "Fifth message" 1 0 | ||
| ] | ||
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| makeRouteNote :: Text -> Int32 -> Int32 -> Proto RouteNote | ||
| makeRouteNote message latitude longitude = | ||
| let location = | ||
| defMessage | ||
| & #latitude .~ latitude | ||
| & #longitude .~ longitude | ||
| in defMessage | ||
| & #message .~ message | ||
| & #location .~ location | ||
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| {------------------------------------------------------------------------------- | ||
| Main application | ||
| -------------------------------------------------------------------------------} | ||
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| client :: Client () | ||
| client = do | ||
| liftIO $ putStrLn "-------------- GetFeature --------------" | ||
| getFeature | ||
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| liftIO $ putStrLn "-------------- ListFeatures --------------" | ||
| listFeatures | ||
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| liftIO $ putStrLn "-------------- RecordRoute --------------" | ||
| recordRoute | ||
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| liftIO $ putStrLn "-------------- RouteChat --------------" | ||
| routeChat | ||
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| main :: IO () | ||
| main = | ||
| withConnection def server $ \conn -> | ||
| runClient conn client | ||
| where | ||
| server :: Server | ||
| server = ServerInsecure $ Address "127.0.0.1" defaultInsecurePort Nothing |
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| module Server (main) where | ||
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| import Control.Monad | ||
| import Control.Monad.Reader | ||
| import Data.IORef | ||
| import Data.Maybe (fromMaybe) | ||
| import Data.Time | ||
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| import Network.GRPC.Common | ||
| import Network.GRPC.Common.Protobuf | ||
| import Network.GRPC.Server.Protobuf | ||
| import Network.GRPC.Server.Run | ||
| import Network.GRPC.Server.StreamType | ||
| import Network.GRPC.Common.NextElem qualified as NextElem | ||
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| import Proto.API.RouteGuide | ||
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| import RouteGuide | ||
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| {------------------------------------------------------------------------------- | ||
| Custom monad for handlers | ||
| The only requirement here as far as @grapesy@ is concerned is that we can | ||
| ultimately hoist these into @IO@ ('hoistMethods'). | ||
| -------------------------------------------------------------------------------} | ||
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| newtype Handler a = WrapHandler { | ||
| unwrapHandler :: ReaderT DB IO a | ||
| } | ||
| deriving newtype (Functor, Applicative, Monad, MonadIO, MonadReader DB) | ||
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| runHandler :: DB -> Handler a -> IO a | ||
| runHandler db = flip runReaderT db . unwrapHandler | ||
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| {------------------------------------------------------------------------------- | ||
| Individual handlers | ||
| -------------------------------------------------------------------------------} | ||
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| getFeature :: Proto Point -> Handler (Proto Feature) | ||
| getFeature p = do | ||
| db <- ask | ||
| return $ fromMaybe (defMessage & #location .~ p) (featureAt db p) | ||
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| listFeatures :: | ||
| Proto Rectangle | ||
| -> (NextElem (Proto Feature) -> IO ()) | ||
| -> Handler () | ||
| listFeatures r send = do | ||
| db <- ask | ||
| liftIO $ NextElem.forM_ (featuresIn db r) send | ||
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| recordRoute :: | ||
| IO (NextElem (Proto Point)) | ||
| -> Handler (Proto RouteSummary) | ||
| recordRoute recv = do | ||
| db <- ask | ||
| liftIO $ do | ||
| start <- getCurrentTime | ||
| ps <- NextElem.collect recv | ||
| stop <- getCurrentTime | ||
| return $ summary db (stop `diffUTCTime` start) ps | ||
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| routeChat :: | ||
| IO (NextElem (Proto RouteNote)) | ||
| -> (NextElem (Proto RouteNote) -> IO ()) | ||
| -> Handler () | ||
| routeChat recv send = liftIO $ do | ||
| st :: IORef Chat <- newIORef emptyChat | ||
| NextElem.whileNext_ recv $ \note -> do | ||
| prev <- atomicModifyIORef st $ \chat -> ( | ||
| recordNote note chat | ||
| , getNotes chat (note ^. #location) | ||
| ) | ||
| -- Can't use NextElem.forM_ here: we don't want to send 'NoNextElem' yet | ||
| forM_ prev $ send . NextElem | ||
| send NoNextElem | ||
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| {------------------------------------------------------------------------------- | ||
| Server top-level | ||
| -------------------------------------------------------------------------------} | ||
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| methods :: Methods Handler (ProtobufMethodsOf RouteGuide) | ||
| methods = | ||
| Method (mkNonStreaming getFeature ) | ||
| $ Method (mkServerStreaming listFeatures) | ||
| $ Method (mkClientStreaming recordRoute ) | ||
| $ Method (mkBiDiStreaming routeChat ) | ||
| $ NoMoreMethods | ||
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| main :: IO () | ||
| main = do | ||
| db <- getDB | ||
| runServerWithHandlers def config $ fromMethods $ | ||
| hoistMethods (runHandler db) methods | ||
| where | ||
| config :: ServerConfig | ||
| config = ServerConfig { | ||
| serverInsecure = Just (InsecureConfig Nothing defaultInsecurePort) | ||
| , serverSecure = Nothing | ||
| } |
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| # RouteGuide features database | ||
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| This is a copy of the database from the official gRPC repo at | ||
| http://github.com/grpc/grpc. |
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