feat: Add a Rel8 PostgreSQL adapter.

Makefile

@@ -7,6 +7,7 @@ targets = build configure check test generate-fixtures docs clean realclean deps
 
 $(targets):
 	$(MAKE) -C primer $@
+	$(MAKE) -C primer-rel8 $@
 	$(MAKE) -C primer-selda $@
 	$(MAKE) -C primer-service $@
 

cabal.project

@@ -2,6 +2,7 @@ index-state: 2021-11-04T00:00:00Z
 
 packages:
   primer
+  primer-rel8
   primer-selda
   primer-service
 

flake.nix

@@ -78,6 +78,7 @@
                   # We want -Werror for Nix builds (primarily for CI).
                   packages = {
                     primer.ghcOptions = [ "-Werror" ];
+                    primer-rel8.ghcOptions = [ "-Werror" ];
                     primer-selda.ghcOptions = [ "-Werror" ];
                     primer-service.ghcOptions = [ "-Werror" ];
                   };
@@ -97,9 +98,10 @@
                   doHoogle = true;
                 }
                 {
-                  # mtl-compat doesn't generate HIE files.
+                  # These packages don't generate HIE files. See:
                   # https://github.com/input-output-hk/haskell.nix/issues/1242
                   packages.mtl-compat.writeHieFiles = false;
+                  packages.bytestring-builder.writeHieFiles = false;
                 }
                 {
                   #TODO This shouldn't be necessary - see the commented-out `build-tool-depends` in primer.cabal.

hie.yaml

@@ -15,6 +15,9 @@ cradle:
             - path: ./primer/test
               component: "primer-test"
 
+            - path: ./primer-rel8/src
+              component: "lib:primer-rel8"
+
             - path: ./primer-selda/src
               component: "lib:primer-selda"
 

primer-rel8/Makefile

@@ -0,0 +1,27 @@
+# NOTE:
+#
+# Most commands assume you're running this from the top-level `nix
+# develop` shell.
+
+build:
+	cabal build
+
+configure:
+	cabal configure
+
+check:	test
+
+test:
+	cabal test
+
+docs:
+	cabal haddock
+
+clean:
+	cabal clean
+
+realclean:
+
+deps:
+
+.PHONY: build configure test docs clean realclean deps

primer-rel8/primer-rel8.cabal

@@ -0,0 +1,52 @@
+cabal-version: 2.4
+name:          primer-rel8
+version:       0.7.0.0
+license:       AGPL-3.0-or-later
+license-file:  COPYING
+copyright:     (c) 2021 Hackworth Ltd
+maintainer:    [email protected]
+author:        Hackworth Ltd <[email protected]>
+stability:     experimental
+synopsis:      Rel8 bindings for the Primer database
+category:      Database
+
+library
+  exposed-modules:
+    Primer.Database.Rel8
+    Primer.Database.Rel8.OrphanInstances
+    Primer.Database.Rel8.Rel8Db
+    Primer.Database.Rel8.Schema
+
+  hs-source-dirs:     src
+  default-language:   Haskell2010
+  default-extensions:
+    NoImplicitPrelude
+    DataKinds
+    DeriveDataTypeable
+    DeriveGeneric
+    DerivingStrategies
+    DerivingVia
+    FlexibleContexts
+    FlexibleInstances
+    GeneralizedNewtypeDeriving
+    LambdaCase
+    MultiParamTypeClasses
+    OverloadedStrings
+    ScopedTypeVariables
+
+  ghc-options:
+    -Wall -Wincomplete-uni-patterns -Wincomplete-record-updates
+    -Wcompat -Widentities -Wredundant-constraints -fhide-source-paths
+
+  build-depends:
+    , aeson       >=1.5.2.0  && <=2.1
+    , base        >=4.12     && <=4.17
+    , bytestring  >=0.10.8.2 && <=0.12
+    , containers  >=0.6.0.1  && <=0.7
+    , exceptions  ^>=0.10.4
+    , hasql       ^>=1.4.5.3
+    , mtl         ^>=2.2.2
+    , primer      ^>=0.7
+    , rel8        ^>=1.1
+    , text        >=1.2.3.2  && <=1.3
+    , uuid        ^>=1.3

primer-rel8/src/Primer/Database/Rel8.hs

@@ -0,0 +1,7 @@
+module Primer.Database.Rel8 (
+  module Schema,
+  module Rel8Db,
+) where
+
+import Primer.Database.Rel8.Rel8Db as Rel8Db
+import Primer.Database.Rel8.Schema as Schema

primer-rel8/src/Primer/Database/Rel8/OrphanInstances.hs

@@ -0,0 +1,21 @@
+{-# LANGUAGE DerivingVia #-}
+{-# LANGUAGE StandaloneDeriving #-}
+{-# OPTIONS_GHC -Wno-orphans #-}
+
+module Primer.Database.Rel8.OrphanInstances (
+  -- * Orphan instances
+  -- $orphanInstances
+) where
+
+import Primer.App (App)
+import Rel8 (
+  DBType,
+  JSONEncoded (..),
+ )
+
+-- $orphanInstances
+--
+-- In order to keep the Primer core library free of a "Rel8"
+-- dependency, we need to define a few orphan instances.
+
+deriving via (JSONEncoded App) instance (DBType App)