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cabal.project
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packages:
./hnix-store-core/hnix-store-core.cabal
./hnix-store-db/hnix-store-db.cabal
./hnix-store-remote/hnix-store-remote.cabal
-- till https://github.com/obsidiansystems/dependent-sum/pull/80
allow-newer:
dependent-sum:some
package hnix-store-db
flags: +build-readme +build-bench
package hnix-store-remote
flags: +build-readme +io-testsuite

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cabal.project.local.ci
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@ -3,5 +3,8 @@ tests: True
package hnix-store-core
ghc-options: -Wunused-packages -Wall -Werror
package hnix-store-db
ghc-options: -Wunused-packages -Wall -Werror
package hnix-store-remote
ghc-options: -Wunused-packages -Wall -Werror

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default.nix
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@ -21,6 +21,7 @@ let
in {
inherit (haskellPackages)
hnix-store-core
hnix-store-db
hnix-store-remote;
haskellPackages = lib.dontRecurseIntoAttrs haskellPackages;
pkgs = lib.dontRecurseIntoAttrs pkgs;

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# Unreleased 202y-mm-dd
* First version.

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hnix-store-db/LICENSE Normal file
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hnix-store-db/README.lhs Symbolic link
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README.md

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# hnix-store-db
[Nix] SQLite database implementation.
Only read-only functionality provided for
database schema version `10`.
[Nix]: https://nixos.org/nix
## API
The interface is experimental and might change wildly.
[System.Nix.Store.DB.Query]: ./src/System/Nix/Store/DB/Query.hs
[System.Nix.Store.DB.Run]: ./src/System/Nix/Store/DB/Run.hs
[System.Nix.Store.DB.Schema]: ./src/System/Nix/Store/DB/Schema.hs
## Example
This example is runnable via `cabal run db-readme`.
```haskell
{-# LANGUAGE OverloadedStrings #-}
import Data.Default.Class (Default(def))
import qualified Control.Monad
import qualified Control.Monad.IO.Class
import qualified Database.Esqueleto.Experimental
import qualified System.Nix.StorePath
import qualified System.Nix.Store.DB.Run
import qualified System.Nix.Store.DB.Schema
import System.Nix.Store.DB.Query
main :: IO ()
main = do
System.Nix.Store.DB.Run.runSystemSqlite $ do
(paths, refs, drvOuts) <- queryEverything
Control.Monad.IO.Class.liftIO $ do
putStrLn $ "Stats: "
let stat name v = putStrLn $ "- " ++ name ++ ": " ++ show (length v)
stat "ValidPath(s)" paths
stat "Ref(s)" refs
stat "DerivationOutput(s)" drvOuts
maybeValidPath <- queryOneValidDerivationEntity
case maybeValidPath of
Nothing -> pure ()
Just validPathEntity -> do
let pth =
System.Nix.Store.DB.Schema.validPathPath
$ Database.Esqueleto.Experimental.entityVal validPathEntity
(same, samePath, references, referrers, validDerivers, outputs) <- (,,,,,)
<$> queryPathInfo pth
<*> queryPathFromHashPart def (System.Nix.StorePath.storePathHash pth)
<*> queryReferences validPathEntity
<*> queryReferrers pth
<*> queryValidDerivers pth
<*> queryDerivationOutputs validPathEntity
Control.Monad.unless (same == Just (Database.Esqueleto.Experimental.entityVal validPathEntity))
$ error "queryPathInfo failed to roundtrip"
Control.Monad.unless (samePath == Just pth)
$ error "queryPathFromHashPart failed to roundtrip"
Control.Monad.IO.Class.liftIO $ do
putStrLn $ "References: "
print references
putStrLn $ "Referrers: "
print referrers
putStrLn $ "Valid derivers: "
print validDerivers
putStrLn $ "Derivation outputs: "
print outputs
pure ()
```

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module Main where
import qualified System.Nix.Store.DB.Run
main :: IO ()
main = System.Nix.Store.DB.Run.bench

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hnix-store-db/hnix-store-db.cabal Normal file
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cabal-version: 2.2
name: hnix-store-db
version: 0.1.0.0
synopsis: Nix store database support
description: Implementation of the nix store database
homepage: https://github.com/haskell-nix/hnix-store
license: Apache-2.0
license-file: LICENSE
author: Richard Marko
maintainer: srk@48.io
copyright: 2023 Richard Marko
category: Nix
build-type: Simple
extra-source-files:
CHANGELOG.md
, README.md
, README.lhs
flag build-bench
default:
False
description:
Build db-bench executable
flag build-readme
default:
False
description:
Build README.lhs example
common commons
ghc-options: -Wall -Wunused-packages
default-extensions:
OverloadedStrings
, DataKinds
, DeriveGeneric
, DeriveDataTypeable
, DeriveFunctor
, DeriveFoldable
, DeriveTraversable
, DeriveLift
, DerivingStrategies
, FlexibleContexts
, FlexibleInstances
, GADTs
, GeneralizedNewtypeDeriving
, RecordWildCards
, ScopedTypeVariables
, StandaloneDeriving
, TypeApplications
, TypeFamilies
, TypeOperators
, TypeSynonymInstances
, InstanceSigs
, MultiParamTypeClasses
, TupleSections
, LambdaCase
, BangPatterns
, ViewPatterns
default-language: Haskell2010
library
import: commons
hs-source-dirs: src
exposed-modules:
System.Nix.Store.DB
, System.Nix.Store.DB.Query
, System.Nix.Store.DB.Instances
, System.Nix.Store.DB.Run
, System.Nix.Store.DB.Schema
, System.Nix.Store.DB.Util
build-depends:
base >=4.10 && <5
, attoparsec
, bytestring
, bytestring
, data-default-class
, text
, time
, hnix-store-core
, esqueleto >= 3.5.10 && < 3.6
, persistent >= 2.14.5 && < 2.15
, persistent-sqlite >= 2.13.1 && < 2.14
, template-haskell
, monad-logger
, microlens
, fast-logger
, transformers
, unliftio-core
executable db-readme
if !flag(build-readme)
buildable: False
build-depends:
base >=4.12 && <5
, data-default-class
, esqueleto
, hnix-store-core
, hnix-store-db
build-tool-depends:
markdown-unlit:markdown-unlit
default-language: Haskell2010
main-is: README.lhs
ghc-options: -pgmL markdown-unlit -Wall
executable db-bench
if !flag(build-bench)
buildable: False
build-depends:
base >=4.12 && <5
, hnix-store-db
default-language: Haskell2010
hs-source-dirs: apps
main-is: Bench.hs
ghc-options: -Wall
test-suite db
import: commons
type: exitcode-stdio-1.0
main-is: Smoke.hs
hs-source-dirs: tests
build-depends:
base
, hnix-store-db

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module System.Nix.Store.DB (
module System.Nix.Store.DB.Query
, module System.Nix.Store.DB.Run
, module System.Nix.Store.DB.Schema
) where
import System.Nix.Store.DB.Query
import System.Nix.Store.DB.Run
import System.Nix.Store.DB.Schema

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE OverloadedStrings #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
module System.Nix.Store.DB.Instances where
import Database.Persist (PersistField(..), PersistValue(..), SqlType(..))
import Database.Persist.Sql (PersistFieldSql(..))
import Data.Time (UTCTime)
import Data.Default.Class (Default(def))
import System.Nix.ContentAddress (ContentAddress)
import System.Nix.StorePath (StorePath)
import System.Nix.StorePath.Metadata (StorePathTrust(..))
import qualified Data.Attoparsec.Text
import qualified Data.Bifunctor
import qualified Data.Text
import qualified Data.Time.Clock.POSIX
import qualified System.Nix.ContentAddress
import qualified System.Nix.StorePath
instance PersistField StorePath where
toPersistValue = PersistText . System.Nix.StorePath.storePathToText def
fromPersistValue (PersistText t) = either
(Left . Data.Text.pack)
Right
$ Data.Attoparsec.Text.parseOnly
(System.Nix.StorePath.pathParser def)
t
fromPersistValue wrongValue = Left
$ "Received "
<> (Data.Text.pack $ show wrongValue)
<> " when a value of type PersistText was expected."
instance PersistFieldSql StorePath where
sqlType _ = SqlString
instance PersistField StorePathTrust where
toPersistValue BuiltLocally = PersistInt64 1
toPersistValue BuiltElsewhere = PersistNull
fromPersistValue (PersistInt64 1) = pure BuiltLocally
fromPersistValue PersistNull = pure BuiltElsewhere
fromPersistValue wrongValue = Left
$ "Received "
<> (Data.Text.pack $ show wrongValue)
<> " when a value of type PersistNull"
<> " or (PersistInt64 1) was expected."
instance PersistFieldSql StorePathTrust where
sqlType _ = SqlInt64
newtype NixUTCTime = NixUTCTime UTCTime
deriving (Eq, Show, Ord)
instance PersistField NixUTCTime where
toPersistValue (NixUTCTime u) = PersistInt64
$ round $ Data.Time.Clock.POSIX.utcTimeToPOSIXSeconds u
fromPersistValue (PersistInt64 i) = pure $ NixUTCTime
$ Data.Time.Clock.POSIX.posixSecondsToUTCTime $ fromIntegral i
fromPersistValue wrongValue = Left
$ "Received "
<> (Data.Text.pack $ show wrongValue)
<> " when a value of (PersistInt64 _) was expected."
instance PersistFieldSql NixUTCTime where
sqlType _ = SqlInt64
instance PersistField ContentAddress where
toPersistValue =
PersistText
. System.Nix.ContentAddress.buildContentAddress
fromPersistValue (PersistText t) =
Data.Bifunctor.first (\e -> error $ show (e, t))
$ System.Nix.ContentAddress.parseContentAddress t
fromPersistValue wrongValue = Left
$ "Received "
<> (Data.Text.pack $ show wrongValue)
<> " when a value of type PersistText was expected."
instance PersistFieldSql ContentAddress where
sqlType _ = SqlString

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{-# LANGUAGE Rank2Types #-}
module System.Nix.Store.DB.Query
( queryPathInfoEntity
, queryPathInfo
, queryReferencesEntity
, queryReferences
, queryReferrersEntity
, queryReferrers
, queryValidDerivers
, queryDerivationOutputs
, queryPathFromHashPart
, queryValidPathsEntity
, queryValidPaths
-- * Testing
, queryAllRefsEntity
, queryAllRefs
, queryAllDerivationOutputsEntity
, queryAllDerivationOutputs
, queryOneValidDerivationEntity
, queryOneValidDerivation
, queryEverything
) where
import Control.Monad.IO.Class (MonadIO)
import Control.Monad.Logger (MonadLogger)
import Data.Text (Text)
import Database.Esqueleto.Experimental
import System.Nix.StorePath (StoreDir, StorePath, StorePathHashPart)
import System.Nix.Store.DB.Schema
import qualified Data.ByteString.Char8
import qualified Data.Maybe
import qualified Data.Text
import qualified System.Nix.StorePath
import qualified System.Nix.StorePath.Metadata
-- * Queries
-- | Query @Entity ValidPath@ for @StorePath@ if it exists.
queryPathInfoEntity
:: ( MonadIO m
, MonadLogger m
)
=> StorePath
-> SqlReadT m (Maybe (Entity ValidPath))
queryPathInfoEntity path = do
res <- select $ do
validPaths <- from $ table @ValidPath
where_ (validPaths ^. ValidPathPath ==. val path)
pure validPaths
pure $ Data.Maybe.listToMaybe res
-- | Query @ValidPath@ for @StorePath@ if it exists.
queryPathInfo
:: ( MonadIO m
, MonadLogger m
)
=> StorePath
-> SqlReadT m (Maybe ValidPath)
queryPathInfo sp =
-- this is expanded from >>= pure $ (fmap . fmap) entityVal
-- to make older GHCs (like 9.0.2) happy
queryPathInfoEntity sp >>= \case
Nothing -> pure Nothing
Just evp -> pure $ Just (entityVal evp)
-- | Query references as a list of @Entity Ref@s for @ValidPath@
-- using id of @Entity ValidPath@
queryReferencesEntity
:: ( MonadIO m
, MonadLogger m
)
=> Entity ValidPath
-> SqlReadT m [Entity Ref]
queryReferencesEntity referrer =
select $ do
(refs :& _validPaths) <-
from $ table @Ref
`innerJoin` table @ValidPath
`on` (\(refs :& validPaths) ->
refs ^. RefReference ==. validPaths ^. ValidPathId)
where_ (refs ^. RefReferrer ==. val (entityKey referrer))
pure refs
-- | Query references as a list of @Ref@s for @ValidPath@
-- by id of @Entity ValidPath@
queryReferences
:: ( MonadIO m
, MonadLogger m
)
=> Entity ValidPath
-> SqlReadT m [Ref]
queryReferences evp = do
queryReferencesEntity evp >>= pure . fmap entityVal
-- | Query referrers as a list of @Entity Ref@s for @StorePath@
queryReferrersEntity
:: ( MonadIO m
, MonadLogger m
)
=> StorePath
-> SqlReadT m [Entity Ref]
queryReferrersEntity path = do
select $ do
(refs :& _validPaths) <-
from $ table @Ref
`innerJoin` table @ValidPath
`on` (\(refs :& validPaths) ->
(refs ^. RefReference ==. validPaths ^. ValidPathId))
where_
(
refs ^. RefReference
`in_`
(subList_select $ do
validPaths <- from $ table @ValidPath
where_ (validPaths ^. ValidPathPath ==. val path)
pure $ validPaths ^. ValidPathId
)
)
pure refs
-- | Query referrers as a list of @Ref@s for @StorePath@
queryReferrers
:: ( MonadIO m
, MonadLogger m
)
=> StorePath
-> SqlReadT m [Ref]
queryReferrers sp =
queryReferrersEntity sp
>>= pure . (fmap entityVal)
-- | Query valid derivers as a list of @(Text, StorePath)@s
-- for some @StorePath@
queryValidDerivers
:: ( MonadIO m
, MonadLogger m
)
=> StorePath
-> SqlReadT m [(Text, StorePath)]
queryValidDerivers path = do
res <- select $ do
(drvOuts :& _validPaths) <-
from $ table @DerivationOutput
`innerJoin` table @ValidPath
`on` (\(drvOuts :& validPaths) ->
(drvOuts ^. DerivationOutputDrv ==. validPaths ^. ValidPathId))
where_ (drvOuts ^. DerivationOutputPath ==. val path)
pure (drvOuts ^. DerivationOutputName, drvOuts ^. DerivationOutputPath)
pure $ unValue2 <$> res
-- | Query derivation outputs as a list of @(Text, StorePath)@s
-- for some @ValidPath@ by its id
queryDerivationOutputs
:: ( MonadIO m
, MonadLogger m
)
=> Entity ValidPath
-> SqlReadT m [(Text, StorePath)]
queryDerivationOutputs drv = do
res <- select $ do
drvOuts <- from $ table @DerivationOutput
where_ (drvOuts ^. DerivationOutputDrv ==. val (entityKey drv))
pure (drvOuts ^. DerivationOutputName, drvOuts ^. DerivationOutputPath)
pure $ unValue2 <$> res
-- | Query @StorePath@ from its hash part
queryPathFromHashPart
:: ( MonadIO m
, MonadLogger m
)
=> StoreDir
-> StorePathHashPart
-> SqlReadT m (Maybe StorePath)
queryPathFromHashPart storeDir hp =
let hashPart =
( Data.Text.pack
. Data.ByteString.Char8.unpack
$ System.Nix.StorePath.unStoreDir storeDir
)
<> "/"
<> System.Nix.StorePath.storePathHashPartToText hp
in do
-- We use rawSql here
-- as otherwise, we would have to construct a @StorePath@
-- to match the type of ValidPath.path, but the @StorePath@
-- always includes name, so we would have to change
-- the type of ValidPath.path to @Either StorePathHashPart StorePath@
-- which isn't worth for a single query
raw <- rawSql
"select ?? from ValidPaths where path >= ? limit 1"
[PersistText hashPart]
pure
$ Data.Maybe.listToMaybe
$ validPathPath . entityVal
<$> raw
-- | Query all valid paths as a list of @Entity ValidPath@s
queryValidPathsEntity
:: ( MonadIO m
, MonadLogger m
)
=> SqlReadT m [Entity ValidPath]
queryValidPathsEntity =
select $ from $ table @ValidPath
-- | Query all valid paths as a list of @ValidPath@s
queryValidPaths
:: ( MonadIO m
, MonadLogger m
)
=> SqlReadT m [ValidPath]
queryValidPaths =
queryValidPathsEntity
>>= pure . fmap entityVal
-- * For testing
-- | Query all references as a list of @Entity Ref@s
queryAllRefsEntity
:: ( MonadIO m
, MonadLogger m
)
=> SqlReadT m [Entity Ref]
queryAllRefsEntity =
select $ from $ table @Ref
-- | Query all references as a list of @Ref@s
queryAllRefs
:: ( MonadIO m
, MonadLogger m
)
=> SqlReadT m [Ref]
queryAllRefs =
queryAllRefsEntity
>>= pure . fmap entityVal
-- | Query all derivation outputs as a list of @Entity DerivationOutput@s
queryAllDerivationOutputsEntity
:: ( MonadIO m
, MonadLogger m
)
=> SqlReadT m [Entity DerivationOutput]
queryAllDerivationOutputsEntity =
select $ from $ table @DerivationOutput
-- | Query all derivation outputs as a list of @DerivationOutput@s
queryAllDerivationOutputs
:: ( MonadIO m
, MonadLogger m
)
=> SqlReadT m [DerivationOutput]
queryAllDerivationOutputs =
queryAllDerivationOutputsEntity
>>= pure . fmap entityVal
-- | Query one random derivation as an @Entity ValidPath@
queryOneValidDerivationEntity
:: ( MonadIO m
, MonadLogger m
)
=> SqlReadT m (Maybe (Entity ValidPath))
queryOneValidDerivationEntity = do
res <- select $ do
validPath <- from $ table @ValidPath -- \validPath -> do
where_
(
validPath ^. ValidPathUltimate
==. (val $ Just System.Nix.StorePath.Metadata.BuiltLocally)
)
offset 100
limit 1
pure validPath
pure $ Data.Maybe.listToMaybe res
-- | Query one random derivation as a @ValidPath@
queryOneValidDerivation
:: ( MonadIO m
, MonadLogger m
)
=> SqlReadT m (Maybe ValidPath)
queryOneValidDerivation =
queryOneValidDerivationEntity
>>= pure . fmap entityVal
-- | Query everything
queryEverything
:: ( MonadIO m
, MonadLogger m
)
=> SqlReadT m
( [Entity ValidPath]
, [Entity Ref]
, [Entity DerivationOutput]
)
queryEverything = (,,)
<$> queryValidPathsEntity
<*> queryAllRefsEntity
<*> queryAllDerivationOutputsEntity
-- * Utility
unValue2 :: (Value a, Value b) -> (a, b)
unValue2 (a, b) = (unValue a, unValue b)

220
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module System.Nix.Store.DB.Run
( systemConnectionInfo
, runSystemSqlite
, memoryConnectionInfo
, runInMemory
, runCustom
, runWithLogging
, allMigrations
, doMigrateAll
, memTest
, testMigrateAll
, test
, bench
) where
import Control.Monad.Logger (LoggingT)
import Control.Monad.Trans.Reader (ReaderT)
import Control.Monad.IO.Class (MonadIO)
import Control.Monad.IO.Unlift (MonadUnliftIO)
import Data.Default.Class (Default(def))
import Data.Text (Text)
import Database.Persist.Sql (SqlPersistM, SqlBackend, Migration)
import Database.Persist.Sqlite (SqliteConnectionInfo)
import System.Nix.Store.DB.Query
import qualified Control.Monad
import qualified Control.Monad.IO.Class
import qualified Control.Monad.Logger
import qualified Data.ByteString.Char8
import qualified Database.Esqueleto.Experimental
import qualified Database.Persist.Sql
import qualified Database.Persist.Sqlite
import qualified System.Log.FastLogger
import qualified System.Nix.StorePath
import qualified System.Nix.Store.DB.Schema
import qualified System.Nix.Store.DB.Util
-- | @SqliteConnectionInfo@ for accessing
-- systems database in /nix/var/nix/db/db.sqlite
-- Currently set to immutable
systemConnectionInfo :: SqliteConnectionInfo
systemConnectionInfo =
Database.Persist.Sqlite.mkSqliteConnectionInfo
"file:/nix/var/nix/db/db.sqlite?immutable=1"
-- | Run with @systemConnectionInfo@
runSystemSqlite
:: SqlPersistM a
-> IO a
runSystemSqlite =
Database.Persist.Sqlite.runSqliteInfo
systemConnectionInfo
-- | @SqliteConnectionInfo@ for running in memory
memoryConnectionInfo :: SqliteConnectionInfo
memoryConnectionInfo =
Database.Persist.Sqlite.mkSqliteConnectionInfo
":memory:"
-- | Run with @memoryConnectionInfo@
runInMemory
:: SqlPersistM a
-> IO a
runInMemory =
Database.Persist.Sqlite.runSqliteInfo
memoryConnectionInfo
-- | Run with custom connection string
runCustom
:: Text
-> SqlPersistM a
-> IO a
runCustom =
Database.Persist.Sqlite.runSqlite
-- | Run with logging
runWithLogging
:: MonadUnliftIO m
=> SqliteConnectionInfo
-> ReaderT SqlBackend (LoggingT m) a
-> m a
runWithLogging connInfo act = do
flip Control.Monad.Logger.runLoggingT
(\_ _ _ s ->
Data.ByteString.Char8.putStrLn
$ System.Log.FastLogger.fromLogStr s
)
$ Database.Persist.Sqlite.withSqliteConnInfo
connInfo
$ Database.Persist.Sql.runSqlConn act
-- | Test that we can create in-memory database
-- and run a dummy query, used by smoke test
memTest :: IO ()
memTest = runInMemory $ do
doMigrateAll
_ <- queryEverything
pure ()
allMigrations :: Migration
allMigrations = do
let addSafeMigration
-- the False means it is not unsafe to run (idempotent)
= Database.Persist.Sql.addMigration False
System.Nix.Store.DB.Schema.migrateAll
addSafeMigration
"CREATE INDEX IF NOT EXISTS IndexReferrer ON Refs(referrer)"
addSafeMigration
"CREATE INDEX IF NOT EXISTS IndexReference ON Refs(reference)"
addSafeMigration
"CREATE INDEX IF NOT EXISTS IndexDerivationOutputs ON DerivationOutputs(path)"
addSafeMigration
"CREATE TRIGGER IF NOT EXISTS DeleteSelfRefs before delete on ValidPaths \
\begin delete from Refs where referrer = old.id and reference = old.id; end;"
-- | Perform migration
doMigrateAll
:: MonadIO m
=> ReaderT SqlBackend m ()
doMigrateAll =
Database.Persist.Sql.runMigration allMigrations
-- | Perform migration on real database
testMigrateAll :: IO ()
testMigrateAll = do
let connInfo =
Database.Persist.Sqlite.mkSqliteConnectionInfo
"/tmp/db.sqlite"
runWithLogging
-- We need to disable foreign key checking otherwise
-- the migration would fail
(System.Nix.Store.DB.Util.disableFK connInfo)
-- this actually returns what queries were performed
-- during migration so we just discard it
$ Control.Monad.void
-- use runMigrationSilent as we have logging enabled
$ Database.Persist.Sql.runMigrationSilent allMigrations
-- | Elaborate test, testing most available query
-- functionality. Same as README.md (db-readme executable)
test :: IO ()
test = do
runSystemSqlite $ do
(paths, refs, drvOuts) <- queryEverything
Control.Monad.IO.Class.liftIO $ do
putStrLn $ "Stats: "
let stat name v = putStrLn $ "- " ++ name ++ ": " ++ show (length v)
stat "ValidPath(s)" paths
stat "Ref(s)" refs
stat "DerivationOutput(s)" drvOuts
maybeValidPath <- queryOneValidDerivationEntity
case maybeValidPath of
Nothing -> pure ()
Just validPathEntity -> do
let pth =
System.Nix.Store.DB.Schema.validPathPath
$ Database.Esqueleto.Experimental.entityVal validPathEntity
(same, samePath, references, referrers, validDerivers, outputs) <- (,,,,,)
<$> queryPathInfo pth
<*> queryPathFromHashPart def (System.Nix.StorePath.storePathHash pth)
<*> queryReferences validPathEntity
<*> queryReferrers pth
<*> queryValidDerivers pth
<*> queryDerivationOutputs validPathEntity
Control.Monad.unless (same == Just (Database.Esqueleto.Experimental.entityVal validPathEntity))
$ error "queryPathInfo failed to roundtrip"
Control.Monad.unless (samePath == Just pth)
$ error "queryPathFromHashPart failed to roundtrip"
Control.Monad.IO.Class.liftIO $ do
putStrLn $ "References: "
print references
putStrLn $ "Referrers: "
print referrers
putStrLn $ "Valid derivers: "
print validDerivers
putStrLn $ "Derivation outputs: "
print outputs
pure ()
-- | Query everything and for each valid path
-- perform detailed queries
bench :: IO ()
bench = do
runSystemSqlite $ do
(paths, refs, drvOuts) <- queryEverything
Control.Monad.IO.Class.liftIO $ do
putStrLn $ "Stats: "
let stat name v = putStrLn $ "- " ++ name ++ ": " ++ show (length v)
stat "ValidPath(s)" paths
stat "Ref(s)" refs
stat "DerivationOutput(s)" drvOuts
Control.Monad.forM_ paths proc
where
proc validPathEntity = do
let pth =
System.Nix.Store.DB.Schema.validPathPath
$ Database.Esqueleto.Experimental.entityVal validPathEntity
(same, samePath, _references, _referrers, _validDerivers, _outputs) <- (,,,,,)
<$> queryPathInfo pth
<*> queryPathFromHashPart def (System.Nix.StorePath.storePathHash pth)
<*> queryReferences validPathEntity
<*> queryReferrers pth
<*> queryValidDerivers pth
<*> queryDerivationOutputs validPathEntity
Control.Monad.unless (same == Just (Database.Esqueleto.Experimental.entityVal validPathEntity))
$ error "queryPathInfo failed to roundtrip"
Control.Monad.unless (samePath == Just pth)
$ error "queryPathFromHashPart failed to roundtrip"

63
hnix-store-db/src/System/Nix/Store/DB/Schema.hs Normal file
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@ -0,0 +1,63 @@
{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE UndecidableInstances #-}
module System.Nix.Store.DB.Schema where
import Data.Text (Text)
import Data.Word (Word64)
import Database.Persist.TH ( mkMigrate
, mkPersist
, share
, sqlSettings
)
import System.Nix.ContentAddress (ContentAddress)
import System.Nix.StorePath (StorePath)
import System.Nix.StorePath.Metadata (StorePathTrust(..))
import System.Nix.Store.DB.Instances (NixUTCTime)
import System.Nix.Store.DB.Util (persistLikeNix)
-- shcema version 10
-- cat /nix/var/nix/db/schema
-- 10
share [ mkPersist sqlSettings
, mkMigrate "migrateAll" ] [persistLikeNix|
ValidPath
path StorePath
hash Text
regTime NixUTCTime sql=registrationTime
deriver StorePath Maybe
narBytes Word64 sql=narSize
ultimate StorePathTrust Maybe
-- ^ null is BuiltElsewhere, 1 is BuiltLocally
sigs Text Maybe
-- ^ space separated
ca ContentAddress Maybe
-- ^ if not null, an assertion that the path is content-addressed
deriving Eq Show Ord
Ref
referrer ValidPathId
reference ValidPathId
Primary referrer reference
Foreign ValidPath OnDeleteCascade fk_referrer referrer
Foreign ValidPath OnDeleteRestrict fk_reference reference
deriving Eq Show Ord
DerivationOutput
drv ValidPathId
name Text sql=id
-- ^ symbolic output id, usually "out"
path StorePath
Primary drv name
Foreign ValidPath OnDeleteCascade fk_drv drv
deriving Eq Show Ord
|]

71
hnix-store-db/src/System/Nix/Store/DB/Util.hs Normal file
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@ -0,0 +1,71 @@
{-# LANGUAGE OverloadedStrings #-}
module System.Nix.Store.DB.Util
( persistLikeNix
, setWAL
, enableWAL
, disableWAL
, setFK
, enableFK
, disableFK
) where
import Language.Haskell.TH.Quote
import Database.Persist.Quasi
import Database.Persist.Sqlite (SqliteConnectionInfo)
import Database.Persist.TH (persistWith)
import qualified Database.Persist.Sqlite
import qualified Lens.Micro
-- | Coerce table names to their plural names
-- i.e. ValidPath -> ValidPaths
persistLikeNix :: QuasiQuoter
persistLikeNix = persistWith $
setPsToDBName
(coerce . (getPsToDBName upperCaseSettings))
upperCaseSettings
where
coerce x | x `elem` ["ValidPath", "Ref", "DerivationOutput"] = plural x
coerce x = x
plural x = x <> "s"
-- * WAL and FK
-- | Configure WAL (write ahead log)
setWAL
:: Bool
-> SqliteConnectionInfo
-> SqliteConnectionInfo
setWAL v = Lens.Micro.over Database.Persist.Sqlite.walEnabled (const v)
-- | Enable WAL (write ahead log)
enableWAL
:: SqliteConnectionInfo
-> SqliteConnectionInfo
enableWAL = setWAL True
-- | Disable WAL (write ahead log)
disableWAL
:: SqliteConnectionInfo
-> SqliteConnectionInfo
disableWAL = setWAL False
-- | Configure FK (foreign key constraints)
setFK
:: Bool
-> SqliteConnectionInfo
-> SqliteConnectionInfo
setFK v = Lens.Micro.over Database.Persist.Sqlite.walEnabled (const v)
-- | Enable foreign key constraint checking
enableFK
:: SqliteConnectionInfo
-> SqliteConnectionInfo
enableFK = setFK True
-- | Disable foreign key constraint checking
disableFK
:: SqliteConnectionInfo
-> SqliteConnectionInfo
disableFK = setFK False

11
hnix-store-db/tests/Smoke.hs Normal file
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@ -0,0 +1,11 @@
module Main where
import qualified System.Nix.Store.DB.Run
-- This only tests that database can be created
-- in-memory using migrateAll and that queryEverything
-- runs (with no data)
--
-- For better test, we would need a populated nix-store
main :: IO ()
main = System.Nix.Store.DB.Run.memTest

6
overlay.nix
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@ -50,6 +50,12 @@ in
[
haskellLib.compose.buildFromSdist
];
hnix-store-db =
lib.pipe
(hself.callCabal2nix "hnix-store-db" ./hnix-store-db {})
[
haskellLib.compose.buildFromSdist
];
hnix-store-remote =
lib.pipe
# enable -fio-testsuite for Linux systems as

6
shell.nix
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@ -3,7 +3,11 @@ let
inherit (import ./. attrs) pkgs haskellPackages;
hlib = pkgs.haskell.lib;
packages = [ "hnix-store-core" "hnix-store-remote" ];
packages = [
"hnix-store-core"
"hnix-store-db"
"hnix-store-remote"
];
extract-external-inputs = p:
builtins.filter
(dep: !(builtins.elem dep packages))