diff options
Diffstat (limited to 'users/Profpatsch/my-prelude/src/Postgres/MonadPostgres.hs')
| -rw-r--r-- | users/Profpatsch/my-prelude/src/Postgres/MonadPostgres.hs | 362 |
1 files changed, 278 insertions, 84 deletions
diff --git a/users/Profpatsch/my-prelude/src/Postgres/MonadPostgres.hs b/users/Profpatsch/my-prelude/src/Postgres/MonadPostgres.hs index e602ee287f..9741f93cac 100644 --- a/users/Profpatsch/my-prelude/src/Postgres/MonadPostgres.hs +++ b/users/Profpatsch/my-prelude/src/Postgres/MonadPostgres.hs @@ -1,36 +1,44 @@ -{-# LANGUAGE AllowAmbiguousTypes #-} -{-# LANGUAGE FunctionalDependencies #-} +{-# LANGUAGE DeriveAnyClass #-} {-# LANGUAGE QuasiQuotes #-} -{-# LANGUAGE TypeFamilyDependencies #-} -{-# LANGUAGE UndecidableInstances #-} +{-# LANGUAGE TemplateHaskell #-} {-# OPTIONS_GHC -Wno-orphans #-} module Postgres.MonadPostgres where +import AtLeast (AtLeast) import Control.Exception import Control.Monad.Except -import Control.Monad.Logger.CallStack +import Control.Monad.Logger (MonadLogger, logDebug, logWarn) import Control.Monad.Reader (MonadReader (ask), ReaderT (..)) +import Control.Monad.Trans.Resource +import Data.Aeson (FromJSON) import Data.Error.Tree import Data.Int (Int64) import Data.Kind (Type) import Data.List qualified as List +import Data.Pool (Pool) +import Data.Pool qualified as Pool +import Data.Text qualified as Text import Data.Typeable (Typeable) import Database.PostgreSQL.Simple (Connection, FormatError, FromRow, Query, QueryError, ResultError, SqlError, ToRow) import Database.PostgreSQL.Simple qualified as PG +import Database.PostgreSQL.Simple qualified as Postgres import Database.PostgreSQL.Simple.FromRow qualified as PG import Database.PostgreSQL.Simple.ToField (ToField) import Database.PostgreSQL.Simple.ToRow (ToRow (toRow)) -import Database.PostgreSQL.Simple.Types (fromQuery) +import Database.PostgreSQL.Simple.Types (Query (..)) import GHC.Records (HasField (..)) import Label import PossehlAnalyticsPrelude import Postgres.Decoder +import Postgres.Decoder qualified as Dec import Pretty (showPretty) +import Seconds import System.Exit (ExitCode (..)) import Tool import UnliftIO (MonadUnliftIO (withRunInIO)) import UnliftIO.Process qualified as Process +import UnliftIO.Resource qualified as Resource -- | Postgres queries/commands that can be executed within a running transaction. -- @@ -38,12 +46,12 @@ import UnliftIO.Process qualified as Process -- and will behave the same unless othewise documented. class Monad m => MonadPostgres (m :: Type -> Type) where -- | Execute an INSERT, UPDATE, or other SQL query that is not expected to return results. - -- + -- Returns the number of rows affected. execute :: (ToRow params, Typeable params) => Query -> params -> Transaction m (Label "numberOfRowsAffected" Natural) - -- | Execute an INSERT, UPDATE, or other SQL query that is not expected to return results. Does not perform parameter substitution. - -- + -- | Execute an INSERT, UPDATE, or other SQL query that is not expected to return results. Does not take parameters. + -- Returns the number of rows affected. execute_ :: Query -> Transaction m (Label "numberOfRowsAffected" Natural) @@ -170,19 +178,72 @@ newtype Transaction m a = Transaction {unTransaction :: (ReaderT Connection m a) runTransaction' :: Connection -> Transaction m a -> m a runTransaction' conn transaction = runReaderT transaction.unTransaction conn +-- | [Resource Pool](http://hackage.haskell.org/package/resource-pool-0.2.3.2/docs/Data-Pool.html) configuration. +data PoolingInfo = PoolingInfo + { -- | Minimal amount of resources that are + -- always available. + numberOfStripes :: AtLeast 1 Int, + -- | Time after which extra resources + -- (above minimum) can stay in the pool + -- without being used. + unusedResourceOpenTime :: Seconds, + -- | Max number of resources that can be + -- in the Pool at any time + maxOpenResourcesPerStripe :: AtLeast 1 Int + } + deriving stock (Generic, Eq, Show) + deriving anyclass (FromJSON) + +initMonadPostgres :: + (Text -> IO ()) -> + -- | Info describing the connection to the Postgres DB + Postgres.ConnectInfo -> + -- | Configuration info for pooling attributes + PoolingInfo -> + -- | Created Postgres connection pool + ResourceT IO (Pool Postgres.Connection) +initMonadPostgres logInfoFn connectInfo poolingInfo = do + (_releaseKey, connPool) <- + Resource.allocate + (logInfoFn "Creating Postgres Connection Pool" >> createPGConnPool) + (\pool -> logInfoFn "Destroying Postgres Connection Pool" >> destroyPGConnPool pool) + pure connPool + where + -- \| Create a Postgres connection pool + createPGConnPool :: + IO (Pool Postgres.Connection) + createPGConnPool = + Pool.createPool + poolCreateResource + poolfreeResource + poolingInfo.numberOfStripes.unAtLeast + (poolingInfo.unusedResourceOpenTime & secondsToNominalDiffTime) + (poolingInfo.maxOpenResourcesPerStripe.unAtLeast) + where + poolCreateResource = Postgres.connect connectInfo + poolfreeResource = Postgres.close + + -- \| Destroy a Postgres connection pool + destroyPGConnPool :: + -- \| Pool to be destroyed + (Pool Postgres.Connection) -> + IO () + destroyPGConnPool p = Pool.destroyAllResources p + -- | Catch any Postgres exception that gets thrown, -- print the query that was run and the query parameters, -- then rethrow inside an 'Error'. handlePGException :: - forall a params m. - (ToRow params, MonadUnliftIO m, MonadLogger m, MonadTools m) => + forall a params tools m. + (ToRow params, MonadUnliftIO m, MonadLogger m, HasField "pgFormat" tools Tool) => + tools -> Text -> Query -> -- | Depending on whether we used `format` or `formatMany`. Either params [params] -> IO a -> Transaction m a -handlePGException queryType query' params io = do +handlePGException tools queryType query' params io = do withRunInIO $ \unliftIO -> io `catches` [ Handler $ unliftIO . logQueryException @SqlError, @@ -197,8 +258,8 @@ handlePGException queryType query' params io = do logQueryException :: Exception e => e -> Transaction m a logQueryException exc = do formattedQuery <- case params of - Left one -> pgFormatQuery' query' one - Right many -> pgFormatQueryMany' query' many + Left one -> pgFormatQuery' tools query' one + Right many -> pgFormatQueryMany' tools query' many throwErr ( singleError [fmt|Query Type: {queryType}|] :| [ nestedError "Exception" (exc & showPretty & newError & singleError), @@ -208,27 +269,75 @@ handlePGException queryType query' params io = do logFormatException :: FormatError -> Transaction m a logFormatException fe = throwErr (fe & showPretty & newError & singleError & singleton) -pgExecute :: (ToRow params, MonadUnliftIO m, MonadLogger m, MonadTools m) => Query -> params -> Transaction m (Label "numberOfRowsAffected" Natural) -pgExecute qry params = do +-- | Perform a Postgres action within a transaction +withPGTransaction :: + -- | Postgres connection pool to be used for the action + (Pool Postgres.Connection) -> + -- | DB-action to be performed + (Postgres.Connection -> IO a) -> + -- | Result of the DB-action + IO a +withPGTransaction connPool f = + Pool.withResource + connPool + (\conn -> Postgres.withTransaction conn (f conn)) + +runPGTransactionImpl :: MonadUnliftIO m => m (Pool Postgres.Connection) -> Transaction m a -> m a +{-# INLINE runPGTransactionImpl #-} +runPGTransactionImpl zoom (Transaction transaction) = do + pool <- zoom + withRunInIO $ \unliftIO -> + withPGTransaction pool $ \conn -> do + unliftIO $ runReaderT transaction conn + +executeImpl :: + (ToRow params, MonadUnliftIO m, MonadLogger m, HasField "pgFormat" tools Tool) => + m tools -> + m DebugLogDatabaseQueries -> + Query -> + params -> + Transaction m (Label "numberOfRowsAffected" Natural) +{-# INLINE executeImpl #-} +executeImpl zoomTools zoomDebugLogDatabaseQueries qry params = do + tools <- lift @Transaction zoomTools + logDatabaseQueries <- lift @Transaction zoomDebugLogDatabaseQueries + logQueryIfEnabled tools logDatabaseQueries qry (HasSingleParam params) conn <- Transaction ask PG.execute conn qry params - & handlePGException "execute" qry (Left params) - >>= toNumberOfRowsAffected "pgExecute" + & handlePGException tools "execute" qry (Left params) + >>= toNumberOfRowsAffected "executeImpl" -pgExecute_ :: (MonadUnliftIO m, MonadLogger m, MonadTools m) => Query -> Transaction m (Label "numberOfRowsAffected" Natural) -pgExecute_ qry = do +executeImpl_ :: + (MonadUnliftIO m, MonadLogger m, HasField "pgFormat" tools Tool) => + m tools -> + m DebugLogDatabaseQueries -> + Query -> + Transaction m (Label "numberOfRowsAffected" Natural) +{-# INLINE executeImpl_ #-} +executeImpl_ zoomTools zoomDebugLogDatabaseQueries qry = do + tools <- lift @Transaction zoomTools + logDatabaseQueries <- lift @Transaction zoomDebugLogDatabaseQueries + logQueryIfEnabled @() tools logDatabaseQueries qry HasNoParams conn <- Transaction ask PG.execute_ conn qry - & handlePGException "execute_" qry (Left ()) - >>= toNumberOfRowsAffected "pgExecute_" + & handlePGException tools "execute_" qry (Left ()) + >>= toNumberOfRowsAffected "executeImpl_" -pgExecuteMany :: (ToRow params, MonadUnliftIO m, MonadLogger m, MonadTools m) => Query -> [params] -> Transaction m (Label "numberOfRowsAffected" Natural) -pgExecuteMany qry params = - do - conn <- Transaction ask - PG.executeMany conn qry params - & handlePGException "executeMany" qry (Right params) - >>= toNumberOfRowsAffected "pgExecuteMany" +executeManyImpl :: + (ToRow params, MonadUnliftIO m, MonadLogger m, HasField "pgFormat" tools Tool) => + m tools -> + m DebugLogDatabaseQueries -> + Query -> + [params] -> + Transaction m (Label "numberOfRowsAffected" Natural) +executeManyImpl zoomTools zoomDebugLogDatabaseQueries qry params = do + tools <- lift @Transaction zoomTools + logDatabaseQueries <- lift @Transaction zoomDebugLogDatabaseQueries + logQueryIfEnabled tools logDatabaseQueries qry (HasMultiParams params) + conn <- Transaction ask + PG.executeMany conn qry params + & handlePGException tools "executeMany" qry (Right params) + >>= toNumberOfRowsAffected "executeManyImpl" toNumberOfRowsAffected :: MonadIO m => Text -> Int64 -> m (Label "numberOfRowsAffected" Natural) toNumberOfRowsAffected functionName i64 = @@ -240,23 +349,35 @@ toNumberOfRowsAffected functionName i64 = & liftIO <&> label @"numberOfRowsAffected" -pgExecuteManyReturningWith :: (ToRow params, MonadUnliftIO m, MonadLogger m, MonadTools m) => Query -> [params] -> Decoder r -> Transaction m [r] -pgExecuteManyReturningWith qry params (Decoder fromRow) = - do - conn <- Transaction ask - PG.returningWith fromRow conn qry params - & handlePGException "executeManyReturning" qry (Right params) +executeManyReturningWithImpl :: + (ToRow params, MonadUnliftIO m, MonadLogger m, HasField "pgFormat" tools Tool) => + m tools -> + m DebugLogDatabaseQueries -> + Query -> + [params] -> + Decoder r -> + Transaction m [r] +{-# INLINE executeManyReturningWithImpl #-} +executeManyReturningWithImpl zoomTools zoomDebugLogDatabaseQueries qry params (Decoder fromRow) = do + tools <- lift @Transaction zoomTools + logDatabaseQueries <- lift @Transaction zoomDebugLogDatabaseQueries + logQueryIfEnabled tools logDatabaseQueries qry (HasMultiParams params) + conn <- Transaction ask + PG.returningWith fromRow conn qry params + & handlePGException tools "executeManyReturning" qry (Right params) -pgFold :: - (FromRow row, ToRow params, MonadUnliftIO m, MonadLogger m, MonadTools m) => +foldRowsImpl :: + (FromRow row, ToRow params, MonadUnliftIO m, MonadLogger m, HasField "pgFormat" tools Tool) => + m tools -> Query -> params -> a -> (a -> row -> Transaction m a) -> Transaction m a -pgFold qry params accumulator f = do +{-# INLINE foldRowsImpl #-} +foldRowsImpl zoomTools qry params accumulator f = do conn <- Transaction ask - + tools <- lift @Transaction zoomTools withRunInIO ( \runInIO -> do @@ -266,10 +387,18 @@ pgFold qry params accumulator f = do params accumulator (\acc row -> runInIO $ f acc row) - & handlePGException "fold" qry (Left params) + & handlePGException tools "fold" qry (Left params) & runInIO ) +pgFormatQueryNoParams' :: + (MonadIO m, MonadLogger m, HasField "pgFormat" tools Tool) => + tools -> + Query -> + Transaction m Text +pgFormatQueryNoParams' tools q = + lift $ pgFormatQueryByteString tools q.fromQuery + pgFormatQuery :: (ToRow params, MonadIO m) => Query -> params -> Transaction m ByteString pgFormatQuery qry params = Transaction $ do conn <- ask @@ -280,29 +409,42 @@ pgFormatQueryMany qry params = Transaction $ do conn <- ask liftIO $ PG.formatMany conn qry params -pgQueryWith :: (ToRow params, MonadUnliftIO m, MonadLogger m, MonadTools m) => Query -> params -> Decoder r -> Transaction m [r] -pgQueryWith qry params (Decoder fromRow) = do +queryWithImpl :: + (ToRow params, MonadUnliftIO m, MonadLogger m, HasField "pgFormat" tools Tool) => + m tools -> + m DebugLogDatabaseQueries -> + Query -> + params -> + Decoder r -> + Transaction m [r] +{-# INLINE queryWithImpl #-} +queryWithImpl zoomTools zoomDebugLogDatabaseQueries qry params (Decoder fromRow) = do + tools <- lift @Transaction zoomTools + logDatabaseQueries <- lift @Transaction zoomDebugLogDatabaseQueries + logQueryIfEnabled tools logDatabaseQueries qry (HasSingleParam params) conn <- Transaction ask PG.queryWith fromRow conn qry params - & handlePGException "query" qry (Left params) + & handlePGException tools "query" qry (Left params) -pgQueryWith_ :: (MonadUnliftIO m, MonadLogger m, MonadTools m) => Query -> Decoder r -> Transaction m [r] -pgQueryWith_ qry (Decoder fromRow) = do +queryWithImpl_ :: (MonadUnliftIO m, MonadLogger m, HasField "pgFormat" tools Tool) => m tools -> Query -> Decoder r -> Transaction m [r] +{-# INLINE queryWithImpl_ #-} +queryWithImpl_ zoomTools qry (Decoder fromRow) = do + tools <- lift @Transaction zoomTools conn <- Transaction ask liftIO (PG.queryWith_ fromRow conn qry) - & handlePGException "query" qry (Left ()) + & handlePGException tools "query" qry (Left ()) -pgQuery :: (ToRow params, FromRow r, MonadUnliftIO m, MonadLogger m, MonadTools m) => Query -> params -> Transaction m [r] -pgQuery qry params = do +pgQuery :: (ToRow params, FromRow r, MonadUnliftIO m, MonadLogger m, HasField "pgFormat" tools Tool) => tools -> Query -> params -> Transaction m [r] +pgQuery tools qry params = do conn <- Transaction ask PG.query conn qry params - & handlePGException "query" qry (Left params) + & handlePGException tools "query" qry (Left params) -pgQuery_ :: (FromRow r, MonadUnliftIO m, MonadLogger m, MonadTools m) => Query -> Transaction m [r] -pgQuery_ qry = do +pgQuery_ :: (FromRow r, MonadUnliftIO m, MonadLogger m, HasField "pgFormat" tools Tool) => tools -> Query -> Transaction m [r] +pgQuery_ tools qry = do conn <- Transaction ask PG.query_ conn qry - & handlePGException "query_" qry (Left ()) + & handlePGException tools "query_" qry (Left ()) data SingleRowError = SingleRowError { -- | How many columns were actually returned by the query @@ -313,41 +455,23 @@ data SingleRowError = SingleRowError instance Exception SingleRowError where displayException (SingleRowError {..}) = [fmt|Single row expected from SQL query result, {numberOfRowsReturned} rows were returned instead."|] -pgFormatQueryNoParams' :: (MonadIO m, MonadLogger m, MonadTools m) => Query -> Transaction m Text -pgFormatQueryNoParams' q = - lift $ pgFormatQueryByteString q.fromQuery - -pgFormatQuery' :: (MonadIO m, ToRow params, MonadLogger m, MonadTools m) => Query -> params -> Transaction m Text -pgFormatQuery' q p = +pgFormatQuery' :: (MonadIO m, ToRow params, MonadLogger m, HasField "pgFormat" tools Tool) => tools -> Query -> params -> Transaction m Text +pgFormatQuery' tools q p = pgFormatQuery q p - >>= lift . pgFormatQueryByteString + >>= lift . pgFormatQueryByteString tools -pgFormatQueryMany' :: (MonadIO m, ToRow params, MonadLogger m, MonadTools m) => Query -> [params] -> Transaction m Text -pgFormatQueryMany' q p = +pgFormatQueryMany' :: (MonadIO m, ToRow params, MonadLogger m, HasField "pgFormat" tools Tool) => tools -> Query -> [params] -> Transaction m Text +pgFormatQueryMany' tools q p = pgFormatQueryMany q p - >>= lift . pgFormatQueryByteString - --- | Tools required at runtime -data Tools = Tools - { pgFormat :: Tool - } - deriving stock (Show) + >>= lift . pgFormatQueryByteString tools -class Monad m => MonadTools m where - getTools :: m Tools - -initMonadTools :: Label "envvar" Text -> IO Tools -initMonadTools var = - Tool.readTools (label @"toolsEnvVar" var.envvar) toolParser - where - toolParser = do - pgFormat <- readTool "pg_format" - pure $ Tools {..} +-- | Read the executable name "pg_format" +postgresToolsParser :: ToolParserT IO (Label "pgFormat" Tool) +postgresToolsParser = label @"pgFormat" <$> readTool "pg_format" -pgFormatQueryByteString :: (MonadIO m, MonadLogger m, MonadTools m) => ByteString -> m Text -pgFormatQueryByteString queryBytes = do +pgFormatQueryByteString :: (MonadIO m, MonadLogger m, HasField "pgFormat" tools Tool) => tools -> ByteString -> m Text +pgFormatQueryByteString tools queryBytes = do do - tools <- getTools (exitCode, stdout, stderr) <- Process.readProcessWithExitCode tools.pgFormat.toolPath @@ -356,8 +480,8 @@ pgFormatQueryByteString queryBytes = do case exitCode of ExitSuccess -> pure (stdout & stringToText) ExitFailure status -> do - logWarn [fmt|pg_format failed with status {status} while formatting the query, using original query string. Is there a syntax error?|] - logDebug + $logWarn [fmt|pg_format failed with status {status} while formatting the query, using original query string. Is there a syntax error?|] + $logDebug ( prettyErrorTree ( nestedMultiError "pg_format output" @@ -366,9 +490,79 @@ pgFormatQueryByteString queryBytes = do ) ) ) - logDebug [fmt|pg_format stdout: stderr|] + $logDebug [fmt|pg_format stdout: stderr|] pure (queryBytes & bytesToTextUtf8Lenient) +data DebugLogDatabaseQueries + = -- | Do not log the database queries + DontLogDatabaseQueries + | -- | Log the database queries as debug output; + LogDatabaseQueries + | -- | Log the database queries as debug output and additionally the EXPLAIN output (from the query analyzer, not the actual values after execution cause that’s a bit harder to do) + LogDatabaseQueriesAndExplain + deriving stock (Show, Enum, Bounded) + +data HasQueryParams param + = HasNoParams + | HasSingleParam param + | HasMultiParams [param] + +-- | Log the postgres query depending on the given setting +logQueryIfEnabled :: + ( ToRow params, + MonadUnliftIO m, + MonadLogger m, + HasField "pgFormat" tools Tool + ) => + tools -> + DebugLogDatabaseQueries -> + Query -> + HasQueryParams params -> + Transaction m () +logQueryIfEnabled tools logDatabaseQueries qry params = do + -- In case we have query logging enabled, we want to do that + let formattedQuery = case params of + HasNoParams -> pgFormatQueryNoParams' tools qry + HasSingleParam p -> pgFormatQuery' tools qry p + HasMultiParams ps -> pgFormatQueryMany' tools qry ps + let doLog errs = + errs + & nestedMultiError "Postgres query" + & prettyErrorTree + & $logDebug + & lift + let addQuery = do + formattedQuery + <&> newError + <&> singleError + let addExplain = do + q <- formattedQuery + queryWithImpl_ + (pure tools) + ( "EXPLAIN " + <> ( + -- TODO: this is not nice, but the only way to get the `executeMany` form to work with this + -- because we need the query with all elements already interpolated. + Query (q & textToBytesUtf8) + ) + ) + (Dec.fromField @Text) + <&> Text.intercalate "\n" + <&> newError + <&> singleError + + case logDatabaseQueries of + DontLogDatabaseQueries -> pure () + LogDatabaseQueries -> do + aq <- addQuery + doLog (aq :| []) + LogDatabaseQueriesAndExplain -> do + aq <- addQuery + -- XXX: stuff like `CREATE SCHEMA` cannot be EXPLAINed, so we should catch exceptions here + -- and just ignore anything that errors (if it errors because of a problem with the query, it would have been caught by the query itself. + ex <- addExplain + doLog (nestedError "Query" aq :| [nestedError "Explain" ex]) + instance (ToField t1) => ToRow (Label l1 t1) where toRow t2 = toRow $ PG.Only $ getField @l1 t2 |