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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, taking advantage of the gRPC Trailers-Only case | ||
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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 the server using the low-level API (similar to | ||
| what we did in `/tutorials/lowlevel`), but taking advantage of the Trailers-Only | ||
| case in `listFeatures`. | ||
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| We don't re-implement the client (you can run the client from | ||
| `tutorials/basics`). | ||
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| module Server (main) where | ||
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| import Control.Monad | ||
| 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.Common.StreamElem qualified as StreamElem | ||
| import Network.GRPC.Server | ||
| import Network.GRPC.Server.Protobuf | ||
| import Network.GRPC.Server.Run | ||
| import Network.GRPC.Server.StreamType (Methods(..), fromMethods) | ||
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| import Proto.API.RouteGuide | ||
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| import RouteGuide | ||
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| {------------------------------------------------------------------------------- | ||
| Individual handlers | ||
| -------------------------------------------------------------------------------} | ||
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| getFeature :: DB -> Call (Protobuf RouteGuide "getFeature") -> IO () | ||
| getFeature db call = do | ||
| p <- recvFinalInput call | ||
| sendFinalOutput call ( | ||
| fromMaybe (defMessage & #location .~ p) (featureAt db p) | ||
| , NoMetadata | ||
| ) | ||
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| listFeatures :: DB -> Call (Protobuf RouteGuide "listFeatures") -> IO () | ||
| listFeatures db call = do | ||
| r <- recvFinalInput call | ||
| case featuresIn db r of | ||
| [] -> sendTrailersOnly call NoMetadata | ||
| ps -> StreamElem.forM_ ps NoMetadata (sendOutput call) | ||
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| recordRoute :: DB -> Call (Protobuf RouteGuide "recordRoute") -> IO () | ||
| recordRoute db call = do | ||
| start <- getCurrentTime | ||
| (ps, NoMetadata) <- StreamElem.collect (recvInput call) | ||
| stop <- getCurrentTime | ||
| sendFinalOutput call ( | ||
| summary db (stop `diffUTCTime` start) ps | ||
| , NoMetadata | ||
| ) | ||
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| routeChat :: Call (Protobuf RouteGuide "routeChat") -> IO () | ||
| routeChat call = do | ||
| st :: IORef Chat <- newIORef emptyChat | ||
| NoMetadata <- StreamElem.whileNext_ (recvInput call) $ \note -> do | ||
| prev <- atomicModifyIORef st $ \chat -> ( | ||
| recordNote note chat | ||
| , getNotes chat (note ^. #location) | ||
| ) | ||
| -- Can't use StreamElem.forM_ here: we don't want to send 'FinalElem' yet | ||
| forM_ prev $ sendNextOutput call | ||
| sendTrailers call NoMetadata | ||
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| {------------------------------------------------------------------------------- | ||
| Server top-level | ||
| -------------------------------------------------------------------------------} | ||
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| methods :: DB -> Methods IO (ProtobufMethodsOf RouteGuide) | ||
| methods db = | ||
| RawMethod (mkRpcHandler $ getFeature db) | ||
| $ RawMethod (mkRpcHandler $ listFeatures db) | ||
| $ RawMethod (mkRpcHandler $ recordRoute db) | ||
| $ RawMethod (mkRpcHandler $ routeChat ) | ||
| $ NoMoreMethods | ||
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| -- Alternative way to define the handlers, avoiding 'fromMethods' | ||
| _handlers :: DB -> [SomeRpcHandler IO] | ||
| _handlers db = [ | ||
| someRpcHandler . mkRpcHandler $ getFeature db | ||
| , someRpcHandler . mkRpcHandler $ listFeatures db | ||
| , someRpcHandler . mkRpcHandler $ recordRoute db | ||
| , someRpcHandler . mkRpcHandler $ routeChat | ||
| ] | ||
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| main :: IO () | ||
| main = do | ||
| db <- getDB | ||
| runServerWithHandlers def config $ fromMethods (methods db) | ||
| where | ||
| config :: ServerConfig | ||
| config = ServerConfig { | ||
| serverInsecure = Just (InsecureConfig Nothing defaultInsecurePort) | ||
| , serverSecure = Nothing | ||
| } |
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| cabal-version: 3.0 | ||
| name: trailers-only-tutorial | ||
| synopsis: gRPC basics tutorial for grapesy, taking advantage of | ||
| the gRPC Trailers-Only case. | ||
| version: 0.1.0 | ||
| license: BSD-3-Clause | ||
| license-file: LICENSE | ||
| author: Edsko de Vries | ||
| maintainer: [email protected] | ||
| build-type: Simple | ||
| tested-with: GHC==8.10.7 | ||
| , GHC==9.2.8 | ||
| , GHC==9.4.8 | ||
| , GHC==9.6.6 | ||
| , GHC==9.8.2 | ||
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| common lang | ||
| build-depends: base >= 4.14 && < 5 | ||
| default-language: Haskell2010 | ||
| ghc-options: -Wall | ||
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| if impl(ghc >= 9.0) | ||
| ghc-options: | ||
| -Wunused-packages | ||
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| default-extensions: | ||
| DataKinds | ||
| ImportQualifiedPost | ||
| NumericUnderscores | ||
| OverloadedLabels | ||
| OverloadedStrings | ||
| ScopedTypeVariables | ||
| TypeApplications | ||
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| executable route_guide_server | ||
| import: lang | ||
| main-is: Server.hs | ||
| hs-source-dirs: app | ||
| ghc-options: -main-is Server | ||
| build-depends: basics-tutorial | ||
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| build-depends: | ||
| , grapesy >= 0.1 && < 0.2 | ||
| , time >= 1.9 && < 1.13 |