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Add persistent client to example 👨🏼💻 (#44)
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@ -8,6 +8,12 @@ Running the server:
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stack run persistent-server
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```
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In another terminal, run the client:
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```bash
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stack run persistent-client
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```
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[comment]: # (Start Copyright)
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# Copyright
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@ -27,3 +27,20 @@ executable persistent-server
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, persistent-sqlite
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, persistent-template
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, text
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executable persistent-client
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main-is: Client.hs
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other-modules: Schema
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build-depends: base >=4.12 && <5
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, conduit
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, mu-schema
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, mu-rpc
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, mu-protobuf
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, mu-grpc-client
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, persistent
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, persistent-sqlite
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, persistent-template
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, text
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hs-source-dirs: src
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default-language: Haskell2010
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ghc-options: -Wall
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52
examples/with-persistent/src/Client.hs
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examples/with-persistent/src/Client.hs
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{-# language AllowAmbiguousTypes #-}
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{-# language DataKinds #-}
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{-# language FlexibleContexts #-}
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{-# language OverloadedStrings #-}
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{-# language ScopedTypeVariables #-}
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{-# language TypeApplications #-}
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{-# language TypeOperators #-}
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module Main where
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import Data.Conduit
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import qualified Data.Conduit.Combinators as C
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import qualified Data.Text as T
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import Database.Persist.Sql (toSqlKey)
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import Database.Persist.Types (Entity(..))
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import System.Environment
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import Mu.GRpc.Client.TyApps
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import Schema
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main :: IO ()
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main = do
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let config = grpcClientConfigSimple "127.0.0.1" 1234 False
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Right client <- setupGrpcClient' config
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args <- getArgs
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case args of
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["watch"] -> watching client
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["get", idp] -> get client idp
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["add", name, age] -> add client name age
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_ -> putStrLn "unknown command"
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get :: GrpcClient -> String -> IO ()
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get client idPerson = do
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let req = PersonRequest $ read idPerson
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putStrLn ("GET: Is there some person with id: " ++ idPerson ++ "?")
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rknown :: GRpcReply (Entity Person)
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<- gRpcCall @PersistentService @"getPerson" client req
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putStrLn ("GET: response was: " ++ show rknown)
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add :: GrpcClient -> String -> String -> IO ()
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add client name age = do
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let p = Entity (toSqlKey 1) (Person (T.pack name) (read age))
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putStrLn ("ADD: Creating new person " <> name <> " with age " <> age)
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response :: GRpcReply PersonRequest
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<- gRpcCall @PersistentService @"newPerson" client p
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putStrLn ("ADD: Was creating successful? " <> show response)
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watching :: GrpcClient -> IO ()
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watching client = do
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replies <- gRpcCall @PersistentService @"allPeople" client
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runConduit $ replies .| C.mapM_ (print :: GRpcReply (Entity Person) -> IO ())
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@ -187,7 +187,7 @@
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Copyright [yyyy] [name of copyright owner]
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Copyright © 2019-2020 47 Degrees. <http://47deg.com>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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@ -100,6 +100,35 @@ instance ( KnownName name, ProtoBufTypeRef rref r
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where methodName = BS.pack (nameVal (Proxy @name))
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rpc = RPC pkgName srvName methodName
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instance ( KnownName name, ProtoBufTypeRef rref r
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, handler ~ (IO (ConduitT () (GRpcReply r) IO ())) )
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=> GRpcMethodCall ('Method name anns '[ ] ('RetStream rref)) handler where
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gRpcMethodCall pkgName srvName _ client
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= do -- Create a new TMChan
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chan <- newTMChanIO :: IO (TMChan r)
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var <- newEmptyTMVarIO -- if full, this means an error
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-- Start executing the client in another thread
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_ <- async $ do
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v <- simplifyResponse $
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buildGRpcReply3 <$>
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rawStreamServer @_ @() @(ViaProtoBufTypeRef rref r)
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rpc client () ()
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(\_ _ (ViaProtoBufTypeRef newVal) -> liftIO $ atomically $
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-- on the first iteration, say that everything is OK
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tryPutTMVar var (GRpcOk ()) >> writeTMChan chan newVal)
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case v of
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GRpcOk () -> liftIO $ atomically $ closeTMChan chan
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_ -> liftIO $ atomically $ putTMVar var v
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-- This conduit feeds information to the other thread
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let go = do firstResult <- liftIO $ atomically $ takeTMVar var
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case firstResult of
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GRpcOk _ -> -- no error, everything is fine
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sourceTMChan chan .| C.map GRpcOk
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e -> yield $ (\_ -> error "this should never happen") <$> e
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return go
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where methodName = BS.pack (nameVal (Proxy @name))
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rpc = RPC pkgName srvName methodName
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instance ( KnownName name, ProtoBufTypeRef vref v
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, handler ~ (v -> IO (GRpcReply ())) )
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=> GRpcMethodCall ('Method name anns '[ 'ArgSingle vref ] 'RetNothing) handler where
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|
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