diff --git a/Makefile b/Makefile index e24843413..7c87e775c 100644 --- a/Makefile +++ b/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 $@ diff --git a/cabal.project b/cabal.project index 8369c11a9..f0c9128e0 100644 --- a/cabal.project +++ b/cabal.project @@ -2,6 +2,7 @@ index-state: 2021-11-04T00:00:00Z packages: primer + primer-rel8 primer-selda primer-service diff --git a/flake.nix b/flake.nix index d7c39e2c1..232c3ca39 100644 --- a/flake.nix +++ b/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. diff --git a/hie.yaml b/hie.yaml index c01b3f73c..ea8583e3a 100644 --- a/hie.yaml +++ b/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" diff --git a/primer-rel8/COPYING b/primer-rel8/COPYING new file mode 100644 index 000000000..be3f7b28e --- /dev/null +++ b/primer-rel8/COPYING @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +. diff --git a/primer-rel8/Makefile b/primer-rel8/Makefile new file mode 100644 index 000000000..9f5a7fa4d --- /dev/null +++ b/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 diff --git a/primer-rel8/primer-rel8.cabal b/primer-rel8/primer-rel8.cabal new file mode 100644 index 000000000..526f121a8 --- /dev/null +++ b/primer-rel8/primer-rel8.cabal @@ -0,0 +1,51 @@ +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: src@hackworthltd.com +author: Hackworth Ltd +stability: experimental +synopsis: Rel8 bindings for the Primer database +category: Database + +library + exposed-modules: + Primer.Database.Rel8 + 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 diff --git a/primer-rel8/src/Primer/Database/Rel8.hs b/primer-rel8/src/Primer/Database/Rel8.hs new file mode 100644 index 000000000..5b154dd53 --- /dev/null +++ b/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 diff --git a/primer-rel8/src/Primer/Database/Rel8/Rel8Db.hs b/primer-rel8/src/Primer/Database/Rel8/Rel8Db.hs new file mode 100644 index 000000000..b9bf93f4a --- /dev/null +++ b/primer-rel8/src/Primer/Database/Rel8/Rel8Db.hs @@ -0,0 +1,261 @@ +{-# LANGUAGE BlockArguments #-} +{-# LANGUAGE DuplicateRecordFields #-} +-- Note: this is on purpose. See 'MonadDb' instance below. +{-# OPTIONS_GHC -fno-warn-orphans #-} + +module Primer.Database.Rel8.Rel8Db ( + Rel8DbT (..), + Rel8Db, +) where + +import Foreword hiding (filter) + +import Control.Monad.Catch (MonadCatch, MonadMask, MonadThrow, throwM) +import Control.Monad.Cont (MonadCont) +import Control.Monad.Fix (MonadFix) +import Control.Monad.Trans (MonadTrans) +import Control.Monad.Writer (MonadWriter) +import Control.Monad.Zip (MonadZip) +import qualified Data.Aeson as Aeson ( + decode, + encode, + ) +import Data.Functor.Contravariant ((>$<)) +import Data.UUID (UUID) +import qualified Data.UUID as UUID (toText) +import Hasql.Connection (Connection) +import Hasql.Session (run, statement) +import Hasql.Statement (Statement) +import Primer.Database ( + MonadDb (..), + OffsetLimit (OL), + Page (Page, pageContents, total), + Session (Session), + SessionData (..), + fromSessionName, + safeMkSessionName, + ) +import Rel8 ( + Expr, + Insert (Insert, into, onConflict, returning, rows), + OnConflict (Abort), + Query, + Returning (NumberOfRowsAffected), + Update (Update, from, returning, set, target, updateWhere), + asc, + countRows, + each, + filter, + insert, + limit, + lit, + litExpr, + offset, + orderBy, + select, + update, + values, + (==.), + ) + +import Primer.Database.Rel8.Schema as Schema ( + SessionRow (..), + sessionRowSchema, + ) + +-- | A wrapper type for managing Rel8 operations. +newtype Rel8DbT m a = Rel8DbT {unRel8DbT :: ReaderT Connection m a} + deriving + ( Functor + , Applicative + , Alternative + , Monad + , MonadError e + , MonadThrow + , MonadCatch + , MonadMask + , MonadReader Connection + , MonadIO + , MonadFail + , MonadFix + , MonadPlus + , MonadTrans + , MonadState s + , MonadWriter w + , MonadZip + , MonadCont + ) + +-- | The 'Rel8DbT' monad transformer applied to 'IO'. +type Rel8Db a = Rel8DbT IO a + +-- | A 'MonadDb' instance for 'Rel8DbT'. +-- +-- This monad throws unexpected exceptions via its 'MonadThrow' +-- instance. Unexpected exceptions include any database errors raised +-- by "Hasql.Session". It's the responsibility of the caller to handle +-- them, as opposed to run-of-the-mill exceptions that may occur; +-- e.g., looking up a session ID that doesn't exist in the database. +-- The latter sorts of exceptions are expressed via the types of the +-- 'MonadDb' methods and are handled by Primer internally. +-- +-- Note: this is purposely an orphan instance, and it should be fine, +-- since this is the canonical implementation, and is simply factored +-- out of the core Primer package for technical reasons. +instance (MonadThrow m, MonadIO m) => MonadDb (Rel8DbT m) where + insertSession v s a n = + runStatement_ $ + insert + Insert + { into = Schema.sessionRowSchema + , rows = + values + [ lit + Schema.SessionRow + { Schema.uuid = s + , Schema.gitversion = v + , Schema.app = Aeson.encode a + , Schema.name = fromSessionName n + } + ] + , onConflict = Abort + , returning = NumberOfRowsAffected + } + updateSessionApp v s a = + runStatement_ $ + update + Update + { target = Schema.sessionRowSchema + , from = allSessions + , set = \_ row -> + row + { Schema.gitversion = lit v + , Schema.app = lit (Aeson.encode a) + } + , updateWhere = \_ row -> Schema.uuid row ==. litExpr s + , returning = NumberOfRowsAffected + } + updateSessionName v s n = + runStatement_ $ + update + Update + { target = Schema.sessionRowSchema + , from = allSessions + , set = \_ row -> + row + { Schema.gitversion = lit v + , Schema.name = lit $ fromSessionName n + } + , updateWhere = \_ row -> Schema.uuid row ==. litExpr s + , returning = NumberOfRowsAffected + } + listSessions ol = do + n' <- runStatement $ select numSessions + let n = case n' of + -- Currently, our page size is 'Int', but Rel8 gives + -- 'Int64'. This needs fixing, but has implications for API + -- clients, so for now we downcast, as we will not hit 2 + -- billion rows anytime soon. See: + -- https://github.com/hackworthltd/primer/issues/238 + [n''] -> fromIntegral n'' + -- This case should never occur, as 'numSessions' should + -- always return a number equal to or greater than '0' (per + -- the Rel8 documentation). However, we have no good way to + -- express this invariant in the type, so we handle this + -- case with a default value of '0'. + -- + -- TODO: this should log an error and cause an HTTP 5xx code + -- to be returned. See: + -- https://github.com/hackworthltd/primer/issues/179 + _ -> 0 + ss :: [(UUID, Text)] <- runStatement $ select $ paginatedSessionMeta ol + pure $ Page{total = n, pageContents = safeMkSession <$> ss} + where + -- See comment in 'querySessionId' re: dealing with invalid + -- session names loaded from the database. + safeMkSession (s, n) = Session s (safeMkSessionName n) + + -- Note: we ignore the stored Primer version for now. + querySessionId _ sid = do + result <- runStatement $ select $ sessionById sid + case result of + [] -> return $ Left $ "No such session ID " <> UUID.toText sid + (s : _) -> + case Aeson.decode (Schema.app s) of + Nothing -> pure $ Left $ "Failed to decode stored program for session ID " <> UUID.toText sid + Just decodedApp -> do + -- Note that we have 2 choices here if the session name + -- returned by the database is not a valid 'SessionName': + -- either we can return a failure, or we can convert it to + -- a valid 'SessionName', possibly including a helpful + -- message. This situation can only ever happen if we've + -- made a mistake (e.g., we've changed the rules on what's + -- a valid 'SessionName' and didn't run a migration), or + -- if someone has edited the database directly, without + -- going through the API. In either case, it would be bad + -- if a student can't load their session just because a + -- session name was invalid, so we opt for the "convert it + -- to a valid 'SessionName'" strategy. For now, we elide + -- the helpful message. + -- + -- We should probably log an event when this occurs. See: + -- https://github.com/hackworthltd/primer/issues/179 + pure $ Right (SessionData decodedApp (safeMkSessionName $ Schema.name s)) + +-- Helper to make dealing with "Hasql.Session" easier. +-- +-- See the note on 'Rel8DbT's 'MonadDb' instance for an explanation of +-- why we handle "Hasql.Session" exceptions the way we do. +runStatement :: (MonadIO m, MonadThrow m, MonadReader Connection m) => Statement () a -> m a +runStatement s = do + conn <- ask + result <- liftIO $ flip run conn $ statement () s + case result of + Left e -> + -- Something went wrong with the database or database + -- connection. This is the responsibility of the caller to + -- handle. + throwM e + Right r -> pure r + +-- As 'runStatement', except this discards the result. +runStatement_ :: (MonadIO m, MonadThrow m, MonadReader Connection m) => Statement () a -> m () +runStatement_ = void . runStatement + +-- "Rel8" queries and other operations. + +-- All sessions in the database. +allSessions :: Query (Schema.SessionRow Expr) +allSessions = each Schema.sessionRowSchema + +-- Select a session by session ID. The session ID is unique, so this +-- should only return at most 1 session, though Hasql's types are not +-- robust enough to represent this invariant. +sessionById :: UUID -> Query (Schema.SessionRow Expr) +sessionById sid = + allSessions >>= filter \p -> Schema.uuid p ==. litExpr sid + +-- Return the number of sessions in the database. +numSessions :: Query (Expr Int64) +numSessions = countRows allSessions + +-- Paginate a query. +-- +-- Note: the order of operations here is important. +-- +-- TODO: review use of 'fromIntegral' here and +-- https://github.com/hackworthltd/primer/issues/238 +paginate :: OffsetLimit -> Query a -> Query a +paginate (OL o (Just l)) = limit (fromIntegral l) . offset (fromIntegral o) +paginate (OL o _) = offset (fromIntegral o) + +-- Return the metadata (represented as a tuple) for all sessions in +-- the database. +sessionMeta :: Query (Expr UUID, Expr Text) +sessionMeta = do + s <- allSessions + return (Schema.uuid s, Schema.name s) + +-- Paginated session metadata, sorted by session name. +paginatedSessionMeta :: OffsetLimit -> Query (Expr UUID, Expr Text) +paginatedSessionMeta ol = paginate ol $ orderBy (snd >$< asc) sessionMeta diff --git a/primer-rel8/src/Primer/Database/Rel8/Schema.hs b/primer-rel8/src/Primer/Database/Rel8/Schema.hs new file mode 100644 index 000000000..ec16cb673 --- /dev/null +++ b/primer-rel8/src/Primer/Database/Rel8/Schema.hs @@ -0,0 +1,54 @@ +{-# LANGUAGE DeriveAnyClass #-} +{-# LANGUAGE StandaloneDeriving #-} +{-# LANGUAGE TypeApplications #-} +{-# LANGUAGE TypeFamilies #-} + +module Primer.Database.Rel8.Schema ( + SessionRow (..), + sessionRowSchema, +) where + +import Foreword + +import Data.ByteString.Lazy as BL hiding (take) +import Data.UUID (UUID) +import Primer.Database ( + Version, + ) +import Rel8 ( + Column, + Name, + Rel8able, + Result, + namesFromLabels, + ) +import qualified Rel8 ( + TableSchema (..), + ) + +-- | A Primer session, as represented in the database. +data SessionRow f = SessionRow + { uuid :: Column f UUID + -- ^ The session's UUID. + , gitversion :: Column f Version + -- ^ Primer's git version. We would prefer that this were a git + -- rev, but for technical reasons, it may also be a last-modified + -- date. + , app :: Column f BL.ByteString + -- ^ The session's 'App'. Note that the 'App' is serialized to + -- JSON before being stored as a bytestring in the database. + , name :: Column f Text + -- ^ The session's name. + } + deriving stock (Generic) + deriving anyclass (Rel8able) + +deriving stock instance f ~ Result => Show (SessionRow f) + +sessionRowSchema :: Rel8.TableSchema (SessionRow Name) +sessionRowSchema = + Rel8.TableSchema + { Rel8.name = "sessions" + , Rel8.schema = Nothing + , Rel8.columns = namesFromLabels @(SessionRow Name) + } diff --git a/weeder.dhall b/weeder.dhall index 27598a9b7..d8d279f9a 100644 --- a/weeder.dhall +++ b/weeder.dhall @@ -1,6 +1,6 @@ let -- TODO remove these once this code (recently ported from old frontend) is exercised tmpRoots = - [ "^Primer.Action.Available", "^Primer.Action.Priorities" ] + [ "^Primer.Action.Available", "^Primer.Action.Priorities", "^Primer.Database.Rel8" ] in { roots = [ "^Main.main$" ] # tmpRoots, type-class-roots = False }