polysemy-kvstore-jsonfile (empty) → 0.1.0.0

raw patch · 5 files changed

+132/−0 lines, 5 filesdep +aesondep +basedep +containers

Dependencies added: aeson, base, containers, exceptions, extra, path, polysemy, polysemy-zoo, unliftio-path

Files

• ChangeLog.md +5/−0
• LICENSE +30/−0
• README.md +4/−0
• polysemy-kvstore-jsonfile.cabal +42/−0
• src/Polysemy/JSONFileKVStore.hs +51/−0

@@ -0,0 +1,5 @@+# Changelog for polysemy-kvstore-jsonfile++## v0.1.0.0++* Add interpreters for running a kvstore as a JSON file.

@@ -0,0 +1,30 @@+Copyright Daniel Firth (c) 2020++All rights reserved.++Redistribution and use in source and binary forms, with or without+modification, are permitted provided that the following conditions are met:++    * Redistributions of source code must retain the above copyright+      notice, this list of conditions and the following disclaimer.++    * 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.++    * Neither the name of Author name here nor the names of other+      contributors may be used to endorse or promote products derived+      from this software without specific prior written permission.++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.

@@ -0,0 +1,4 @@+# polysemy-kvstore-jsonfile++Polysemy.JSONFileKVStore is an insane way to interpret a KVStore in polysemy,+by running it as a single JSON file serialized as a Map.

@@ -0,0 +1,42 @@+cabal-version: 1.12++-- This file has been generated from package.yaml by hpack version 0.34.2.+--+-- see: https://github.com/sol/hpack++name:           polysemy-kvstore-jsonfile+version:        0.1.0.0+synopsis:       Run a KVStore as a single json file in polysemy.+category:       Polysemy+author:         Daniel Firth+maintainer:     dan.firth@homotopic.tech+copyright:      2020 Daniel Firth+license:        MIT+license-file:   LICENSE+build-type:     Simple+extra-source-files:+    README.md+    ChangeLog.md++source-repository head+  type: git+  location: https://gitlab.com/homotopic-tech/polysemy-kvstore-jsonfile++library+  exposed-modules:+      Polysemy.JSONFileKVStore+  other-modules:+      Paths_polysemy_kvstore_jsonfile+  hs-source-dirs:+      src+  build-depends:+      aeson+    , base >=4.7 && <5+    , containers+    , exceptions+    , extra+    , path+    , polysemy+    , polysemy-zoo+    , unliftio-path+  default-language: Haskell2010

@@ -0,0 +1,51 @@+{-# LANGUAGE BlockArguments      #-}+{-# LANGUAGE DataKinds           #-}+{-# LANGUAGE DeriveGeneric       #-}+{-# LANGUAGE GADTs               #-}+{-# LANGUAGE LambdaCase          #-}+{-# LANGUAGE PolyKinds           #-}+{-# LANGUAGE ScopedTypeVariables #-}+{-# LANGUAGE TypeApplications    #-}+{-# LANGUAGE TypeOperators       #-}+module Polysemy.JSONFileKVStore where++import Control.Monad.Catch+import Control.Monad.Extra+import Control.Monad.IO.Class+import Data.Aeson+import qualified Data.Map as Map+import Data.Map (Map)+import GHC.Generics+import Polysemy+import Polysemy.Error+import Polysemy.Input+import Polysemy.KVStore+import Path+import qualified UnliftIO.Path.Directory as U++newtype JSONParseException = JSONParseException String+  deriving (Show, Eq, Generic)++instance Exception JSONParseException where+  displayException (JSONParseException x) = x++eitherDecodeOrCreate :: (ToJSON a, FromJSON a, MonadIO m) => Path b File -> a -> m (Either String a)+eitherDecodeOrCreate f x = do+  whenM (fmap not . U.doesFileExist $ f) $ liftIO $ encodeFile (toFilePath f) x+  liftIO $ eitherDecodeFileStrict' (toFilePath f)++runKVStoreAsJSONFileStore :: (Members '[Embed IO, Error JSONParseException] r,+                              FromJSONKey k, ToJSONKey k, FromJSON v, ToJSON v, Ord k)+                          => Path b File+                          -> Sem (KVStore k v ': r) a -> Sem r a+runKVStoreAsJSONFileStore d = interpret \case+  LookupKV k -> do+    z <- eitherDecodeOrCreate d mempty+    case z of+      Left x  -> throw @JSONParseException $ JSONParseException x+      Right x -> return $ Map.lookup k x+  UpdateKV k v -> do+    z <- eitherDecodeOrCreate d mempty+    case z of+      Left x -> throw $ JSONParseException x+      Right (x :: Map k v) -> embed $ encodeFile (toFilePath d) (Map.alter (const v) k x)