multipool-persistent (empty) → 0.1.0.0

raw patch · 7 files changed

+136/−0 lines, 7 filesdep +basedep +mtldep +multipoolsetup-changed

Dependencies added: base, mtl, multipool, multipool-persistent, persistent, unliftio-core, unordered-containers

Files

• ChangeLog.md +3/−0
• LICENSE +30/−0
• README.md +1/−0
• Setup.hs +2/−0
• multipool-persistent.cabal +60/−0
• src/Data/MultiPool/Persist/Sql.hs +38/−0
• test/Spec.hs +2/−0

@@ -0,0 +1,3 @@+# Changelog for multipool-persistent++## Unreleased changes

@@ -0,0 +1,30 @@+Copyright Ian Duncan (c) 2018++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 Ian Duncan 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 +1,1 @@+# multipool-persistent

@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain

@@ -0,0 +1,60 @@+-- This file has been generated from package.yaml by hpack version 0.28.2.+--+-- see: https://github.com/sol/hpack+--+-- hash: 33a046c600cc8d0a53f52d114443a388df18b1bd046b3126a1a7e6671b2aa012++name:           multipool-persistent+version:        0.1.0.0+synopsis:       Read and write from appropriate persistent sql instances in replicated environments.+description:    Please see the README on GitHub at <https://github.com/iand675/multipool-persistent#readme>+homepage:       https://github.com/iand675/multipool-persistent#readme+bug-reports:    https://github.com/iand675/multipool-persistent/issues+author:         Ian Duncan+maintainer:     ian@iankduncan.com+copyright:      Ian Duncan+license:        BSD3+license-file:   LICENSE+build-type:     Simple+cabal-version:  >= 1.10+extra-source-files:+    ChangeLog.md+    README.md++source-repository head+  type: git+  location: https://github.com/iand675/multipool-persistent++library+  exposed-modules:+      Data.MultiPool.Persist.Sql+  other-modules:+      Paths_multipool_persistent+  hs-source-dirs:+      src+  build-depends:+      base >=4.7 && <5+    , mtl+    , multipool+    , persistent+    , unliftio-core+    , unordered-containers+  default-language: Haskell2010++test-suite multipool-persistent-test+  type: exitcode-stdio-1.0+  main-is: Spec.hs+  other-modules:+      Paths_multipool_persistent+  hs-source-dirs:+      test+  ghc-options: -threaded -rtsopts -with-rtsopts=-N+  build-depends:+      base >=4.7 && <5+    , mtl+    , multipool+    , multipool-persistent+    , persistent+    , unliftio-core+    , unordered-containers+  default-language: Haskell2010

@@ -0,0 +1,38 @@+{-# LANGUAGE FlexibleInstances #-}+{-# LANGUAGE MultiParamTypeClasses #-}+{-# LANGUAGE TypeFamilies #-}+module Data.MultiPool.Persist.Sql+    ( MultiPoolBackend(..)+    , unsafeRead+    ) where++import Control.Exception+import Control.Monad.IO.Unlift+import Control.Monad.Reader+import Data.MultiPool+import Database.Persist.Sql+import Database.Persist.Sql.Types.Internal+import Data.HashMap.Strict (HashMap)+import qualified Data.HashMap.Strict as HM++instance MonadUnliftIO m => MultiPoolBackend m SqlBackend where+  type MasterConnection SqlBackend = SqlWriteBackend+  type ReplicaConnection SqlBackend = SqlReadBackend+  type ReplicaIdentifier SqlBackend = InstanceName SqlReadBackend++  runWriteAny b m = runWrite b () m+  runWrite b () m = runSqlPool m (multiPoolMaster b)++  runReadMaster b () m = runReadAnyMaster b m+  runReadAnyMaster b m = runSqlPool (readToWrite m) (multiPoolMaster b)+  runReadAny b m = do+    mident <- liftIO $ multiPoolAnyReplicaSelector b b+    case mident of+      Nothing -> runReadAnyMaster b m+      Just ident -> runRead b ident m+  runRead b ident m = case HM.lookup ident (multiPoolReplica b) of+    Nothing -> throw (InstanceDoesNotExist ident)+    Just repl -> runSqlPool m repl++unsafeRead :: ReaderT SqlBackend m a -> ReaderT SqlReadBackend m a+unsafeRead = withReaderT persistBackend

@@ -0,0 +1,2 @@+main :: IO ()+main = putStrLn "Test suite not yet implemented"