{-# LANGUAGE DeriveAnyClass #-} {-# LANGUAGE DuplicateRecordFields #-} {-# LANGUAGE QuasiQuotes #-} {-# LANGUAGE ScopedTypeVariables #-} module WhatcdResolver where import Control.Category qualified as Cat import Control.Monad.Catch.Pure (runCatch) import Control.Monad.Logger qualified as Logger import Control.Monad.Logger.CallStack import Control.Monad.Reader import Data.Aeson qualified as Json import Data.Aeson.BetterErrors qualified as Json import Data.Aeson.KeyMap qualified as KeyMap import Data.ByteString.Builder qualified as Builder import Data.Error.Tree import Data.HashMap.Strict qualified as HashMap import Data.List qualified as List import Data.List.NonEmpty qualified as NonEmpty import Data.Map.Strict qualified as Map import Data.Pool (Pool) import Data.Pool qualified as Pool import Data.Set (Set) import Data.Set qualified as Set import Data.Text qualified as Text import Database.PostgreSQL.Simple (Binary (Binary), Only (..)) import Database.PostgreSQL.Simple qualified as Postgres import Database.PostgreSQL.Simple.SqlQQ (sql) import Database.PostgreSQL.Simple.Types (PGArray (PGArray)) import Database.Postgres.Temp qualified as TmpPg import FieldParser (FieldParser, FieldParser' (..)) import FieldParser qualified as Field import GHC.Records (HasField (..)) import GHC.Stack qualified import IHP.HSX.QQ (hsx) import Json qualified import Json.Enc (Enc) import Json.Enc qualified as Enc import Label import Multipart2 qualified as Multipart import Network.HTTP.Client.Conduit qualified as Http import Network.HTTP.Simple qualified as Http import Network.HTTP.Types import Network.HTTP.Types qualified as Http import Network.HTTP.Types.URI qualified as Url import Network.URI qualified import Network.Wai qualified as Wai import Network.Wai.Handler.Warp qualified as Warp import Network.Wai.Parse qualified as Wai import OpenTelemetry.Trace qualified as Otel hiding (getTracer, inSpan, inSpan') import OpenTelemetry.Trace.Core qualified as Otel hiding (inSpan, inSpan') import OpenTelemetry.Trace.Monad qualified as Otel import Parse (Parse) import Parse qualified import PossehlAnalyticsPrelude import Postgres.Decoder qualified as Dec import Postgres.MonadPostgres import Pretty import RunCommand (runCommandExpect0) import System.Directory qualified as Dir import System.Directory qualified as Xdg import System.Environment qualified as Env import System.FilePath (()) import System.IO qualified as IO import Text.Blaze.Html (Html) import Text.Blaze.Html.Renderer.Pretty qualified as Html.Pretty import Text.Blaze.Html.Renderer.Utf8 qualified as Html import Text.Blaze.Html5 qualified as Html import Tool (Tool, readTool, readTools) import UnliftIO import Prelude hiding (span) main :: IO () main = runAppWith ( do -- todo: trace that to the init functions as well Otel.inSpan "whatcd-resolver main function" Otel.defaultSpanArguments $ do _ <- runTransaction migrate htmlUi ) <&> first showToError >>= expectIOError "could not start whatcd-resolver" htmlUi :: AppT IO () htmlUi = do let debug = True withRunInIO $ \runInIO -> Warp.run 9092 $ \req respond -> do let catchAppException act = try act >>= \case Right a -> pure a Left (AppException err) -> do runInIO (logError err) respond (Wai.responseLBS Http.status500 [] "") catchAppException $ do let renderHtml = if debug then Html.Pretty.renderHtml >>> stringToText >>> textToBytesUtf8 >>> toLazyBytes else Html.renderHtml let h route act = runInIO $ Otel.inSpan' [fmt|Route {route }|] ( Otel.defaultSpanArguments { Otel.attributes = HashMap.fromList [ ("server.path", Otel.toAttribute @Text route) ] } ) ( \span -> withRunInIO $ \runInIO' -> do res <- runInIO' $ act span respond . Wai.responseLBS Http.ok200 [("Content-Type", "text/html")] . renderHtml $ res ) let mp span parser = Multipart.parseMultipartOrThrow (appThrowTree span) parser req let torrentIdMp span = mp span ( do label @"torrentId" <$> Multipart.field "torrent-id" ((Field.utf8 >>> Field.signedDecimal >>> Field.bounded @Int "int")) ) let parseQueryArgs span parser = Parse.runParse "Unable to find the right request query arguments" (lmap Wai.queryString parser) req & assertM span id case req & Wai.pathInfo & Text.intercalate "/" of "" -> h "/" mainHtml "snips/redacted/search" -> do h "/snips/redacted/search" $ \span -> do dat <- mp span ( do label @"searchstr" <$> Multipart.field "redacted-search" Cat.id ) snipsRedactedSearch dat "snips/redacted/torrentDataJson" -> h "/snips/redacted/torrentDataJson" $ \span -> do dat <- torrentIdMp span mkVal <$> (runTransaction $ getTorrentById dat) "snips/redacted/getTorrentFile" -> h "/snips/redacted/getTorrentFile" $ \span -> do dat <- torrentIdMp span runTransaction $ do inserted <- redactedGetTorrentFileAndInsert dat running <- lift @Transaction $ doTransmissionRequest' (transmissionRequestAddTorrent inserted) updateTransmissionTorrentHashById ( T2 (getLabel @"torrentHash" running) (getLabel @"torrentId" dat) ) pure $ everySecond "snips/transmission/getTorrentState" (Enc.object [("torrent-hash", Enc.text running.torrentHash)]) "Starting" -- TODO: this is bad duplication?? "snips/redacted/startTorrentFile" -> h "/snips/redacted/startTorrentFile" $ \span -> do dat <- torrentIdMp span runTransaction $ do file <- getTorrentFileById dat <&> annotate [fmt|No torrent file for torrentId "{dat.torrentId}"|] >>= orAppThrowTree span running <- lift @Transaction $ doTransmissionRequest' (transmissionRequestAddTorrent file) updateTransmissionTorrentHashById ( T2 (getLabel @"torrentHash" running) (getLabel @"torrentId" dat) ) pure $ everySecond "snips/transmission/getTorrentState" (Enc.object [("torrent-hash", Enc.text running.torrentHash)]) "Starting" "snips/transmission/getTorrentState" -> h "/snips/transmission/getTorrentState" $ \span -> do dat <- mp span $ label @"torrentHash" <$> Multipart.field "torrent-hash" Field.utf8 status <- doTransmissionRequest' ( transmissionRequestListOnlyTorrents ( T2 (label @"ids" [label @"torrentHash" dat.torrentHash]) (label @"fields" ["hashString"]) ) (Json.keyLabel @"torrentHash" "hashString" Json.asText) ) <&> List.find (\torrent -> torrent.torrentHash == dat.torrentHash) pure $ case status of Nothing -> [hsx|ERROR unknown|] Just _torrent -> [hsx|Running|] "snips/jsonld/render" -> h "/snips/jsonld/render" $ \span -> do qry <- parseQueryArgs span ( label @"target" <$> ( singleQueryArgument "target" Field.utf8 >>> textToHttpClientRequest ) ) jsonld <- httpGetJsonLd span (qry.target) pure $ renderJsonld jsonld otherRoute -> h [fmt|/{otherRoute}|] mainHtml where everySecond :: Text -> Enc -> Html -> Html everySecond call extraData innerHtml = [hsx|
{innerHtml}
|] mainHtml span = runTransaction $ do -- jsonld <- httpGetJsonLd span "https://musicbrainz.org/work/92000fd4-d304-406d-aeb4-6bdbeed318ec" <&> renderJsonld bestTorrentsTable <- getBestTorrentsTable -- transmissionTorrentsTable <- lift @Transaction getTransmissionTorrentsTable pure $ Html.docTypeHtml [hsx| {""::Text {-jsonld-}}
Search running!
{bestTorrentsTable}
|] singleQueryArgument :: Text -> FieldParser ByteString to -> Parse Http.Query to singleQueryArgument field inner = Parse.mkParsePushContext field ( \(ctx, qry) -> case qry & mapMaybe ( \(k, v) -> if k == (field & textToBytesUtf8) then Just v else Nothing ) of [] -> Left [fmt|No such query argument "{field}", at {ctx & Parse.showContext}|] [Nothing] -> Left [fmt|Expected one query argument with a value, but "{field}" was a query flag|] [Just one] -> Right one more -> Left [fmt|More than one value for query argument "{field}": {show more}, at {ctx & Parse.showContext}|] ) >>> Parse.fieldParser inner -- | Make sure we can parse the given Text into a Request via a URI. -- -- This tries to work around the horrible, horrible interface in Http.Client. textToHttpClientRequest :: Parse Text Http.Request textToHttpClientRequest = Parse.fieldParser ( FieldParser $ \text -> text & textToString & Network.URI.parseURI & annotate [fmt|Cannot parse this as a URL: "{text}"|] ) >>> ( Parse.mkParseNoContext ( \url -> (url & Http.requestFromURI) & runCatch & first (checkException @Http.HttpException) & \case Left (Right (Http.InvalidUrlException urlText reason)) -> Left [fmt|Unable to set the url "{urlText}" as request URL, reason: {reason}|] Left (Right exc@(Http.HttpExceptionRequest _ _)) -> Left [fmt|Weird! Should not get a HttpExceptionRequest when parsing an URL (bad library design), was {exc & displayException}|] Left (Left someExc) -> Left [fmt|Weird! Should not get anyhting but a HttpException when parsing an URL (bad library design), was {someExc & displayException}|] Right req -> pure req ) ) checkException :: (Exception b) => SomeException -> Either SomeException b checkException some = case fromException some of Nothing -> Left some Just e -> Right e snipsRedactedSearch :: ( MonadLogger m, MonadPostgres m, HasField "searchstr" r ByteString, MonadThrow m, MonadTransmission m, Otel.MonadTracer m, MonadUnliftIO m ) => r -> m Html snipsRedactedSearch dat = do t <- redactedSearchAndInsert [ ("searchstr", dat.searchstr), ("releasetype", "album") ] runTransaction $ do t getBestTorrentsTable getBestTorrentsTable :: ( MonadTransmission m, MonadThrow m, MonadLogger m, MonadPostgres m, Otel.MonadTracer m, MonadUnliftIO m ) => Transaction m Html getBestTorrentsTable = do bestStale :: [TorrentData ()] <- getBestTorrents actual <- getAndUpdateTransmissionTorrentsStatus ( bestStale & mapMaybe ( \td -> case td.torrentStatus of InTransmission h -> Just h _ -> Nothing ) <&> (\t -> (getLabel @"torrentHash" t, t.transmissionInfo)) & Map.fromList ) let fresh = bestStale -- we have to update the status of every torrent that’s not in tranmission anymore -- TODO I feel like it’s easier (& more correct?) to just do the database request again … <&> ( \td -> case td.torrentStatus of InTransmission info -> case actual & Map.lookup (getLabel @"torrentHash" info) of -- TODO this is also pretty dumb, cause it assumes that we have the torrent file if it was in transmission before, -- which is an internal factum that is established in getBestTorrents (and might change later) Nothing -> td {torrentStatus = NotInTransmissionYet} Just transmissionInfo -> td {torrentStatus = InTransmission (T2 (getLabel @"torrentHash" info) (label @"transmissionInfo" transmissionInfo))} NotInTransmissionYet -> td {torrentStatus = NotInTransmissionYet} NoTorrentFileYet -> td {torrentStatus = NoTorrentFileYet} ) let localTorrent b = case b.torrentStatus of NoTorrentFileYet -> [hsx||] InTransmission info -> [hsx|{info.transmissionInfo.percentDone.unPercentage}% done|] NotInTransmissionYet -> [hsx||] let bestRows = fresh & foldMap ( \b -> do [hsx| {localTorrent b} {Html.toHtml @Int b.groupId} {Html.toHtml @Text b.torrentGroupJson.artist} {Html.toHtml @Text b.torrentGroupJson.groupName} {Html.toHtml @Int b.seedingWeight}
|] ) pure $ [hsx| {bestRows}
Local Group ID Artist Name Weight Torrent Torrent Group
|] data Jsonld = JsonldObject JsonldObject | JsonldArray [Jsonld] | JsonldField Json.Value deriving stock (Show, Eq) data JsonldObject = JsonldObject' { type_ :: Set Text, id_ :: Text, previewFields :: Map Text Jsonld } deriving stock (Show, Eq) jsonldParser :: (Monad m) => Json.ParseT err m Jsonld jsonldParser = Json.asValue >>= \cur -> do if | Json.Object _ <- cur -> do typeMay <- Json.keyMay "@type" $ (Json.asArraySet Json.asText Json.<|> (Set.singleton <$> Json.asText)) idMay <- Json.keyMay "@id" $ Json.asText if | Just type_ <- typeMay, Just id_ <- idMay -> do previewFields <- Json.asObjectMap jsonldParser <&> Map.delete "@type" <&> Map.delete "@id" pure $ JsonldObject $ JsonldObject' {..} | otherwise -> pure $ JsonldField cur | Json.Array _ <- cur -> do JsonldArray <$> Json.eachInArray jsonldParser | otherwise -> pure $ JsonldField cur renderJsonld :: Jsonld -> Html renderJsonld = \case JsonldObject obj -> [hsx|
Type
{obj.type_ & toList & schemaTypes}
Url
{obj.id_}
Fields
{obj.previewFields & toDefinitionList schemaType renderJsonld}
|] where snippetHref target = Builder.toLazyByteString $ "/snips/jsonld/render" <> Url.renderQueryBuilder True [("target", Just (textToBytesUtf8 target))] schemaTypes xs = xs <&> schemaType & List.intersperse ", " & mconcat schemaType t = let href :: Text = [fmt|https://schema.org/{t}|] in [hsx|{t}|] JsonldArray arr -> toOrderedList renderJsonld arr JsonldField f -> mkVal f -- | A value between (inclusive) 0% and (inclusive) 100%. Precise to 1% steps. newtype Percentage = Percentage {unPercentage :: Int} deriving stock (Show) -- | Parse a scientific into a Percentage scientificPercentage :: FieldParser' Error Scientific Percentage scientificPercentage = Field.boundedScientificRealFloat @Float >>> ( FieldParser $ \f -> if | f < 0 -> Left "percentage cannot be negative" | f > 1 -> Left "percentage cannot be over 100%" | otherwise -> Right $ Percentage $ ceiling (f * 100) ) -- | Fetch the current status from transmission, and remove the tranmission hash from our database -- iff it does not exist in transmission anymore getAndUpdateTransmissionTorrentsStatus :: ( MonadTransmission m, MonadThrow m, MonadLogger m, MonadPostgres m, Otel.MonadTracer m, MonadUnliftIO m ) => Map (Label "torrentHash" Text) () -> (Transaction m (Map (Label "torrentHash" Text) (Label "percentDone" Percentage))) getAndUpdateTransmissionTorrentsStatus knownTorrents = do let fields = ["hashString", "percentDone"] actualTorrents <- lift @Transaction $ doTransmissionRequest' ( transmissionRequestListOnlyTorrents ( T2 (label @"fields" fields) (label @"ids" (Map.keys knownTorrents)) ) $ do torrentHash <- Json.keyLabel @"torrentHash" "hashString" Json.asText percentDone <- Json.keyLabel @"percentDone" "percentDone" (Field.toJsonParser $ Field.jsonNumber >>> scientificPercentage) pure (torrentHash, percentDone) ) <&> Map.fromList let toDelete = Map.difference knownTorrents actualTorrents execute [fmt| UPDATE redacted.torrents_json SET transmission_torrent_hash = NULL WHERE transmission_torrent_hash = ANY (?::text[]) |] $ Only (toDelete & Map.keys <&> (.torrentHash) & PGArray :: PGArray Text) pure actualTorrents getTransmissionTorrentsTable :: (MonadTransmission m, MonadThrow m, MonadLogger m, Otel.MonadTracer m, MonadUnliftIO m) => m Html getTransmissionTorrentsTable = do let fields = [ "hashString", "name", "percentDone", "percentComplete", "downloadDir", "files" ] doTransmissionRequest' ( transmissionRequestListAllTorrents fields $ do Json.asObject <&> KeyMap.toMapText ) <&> \resp -> toTable ( resp & List.sortOn (\m -> m & Map.lookup "percentDone" & fromMaybe (Json.Number 0)) <&> Map.toList -- TODO & List.take 100 ) -- | Render an arbitrary json value to HTML in a more-or-less reasonable fashion. mkVal :: Json.Value -> Html mkVal = \case Json.Number n -> Html.toHtml @Text $ showToText n Json.String s -> Html.toHtml @Text s Json.Bool True -> [hsx|true|] Json.Bool False -> [hsx|false|] Json.Null -> [hsx|null|] Json.Array arr -> toOrderedList mkVal arr Json.Object obj -> obj & KeyMap.toMapText & toDefinitionList (Html.toHtml @Text) mkVal toOrderedList :: (Foldable t1) => (t2 -> Html) -> t1 t2 -> Html toOrderedList mkValFn arr = arr & foldMap (\el -> Html.li $ mkValFn el) & Html.ol toUnorderedList :: (Foldable t1) => (t2 -> Html) -> t1 t2 -> Html toUnorderedList mkValFn arr = arr & foldMap (\el -> Html.li $ mkValFn el) & Html.ul -- | Render a definition list from a Map toDefinitionList :: (Text -> Html) -> (t -> Html) -> Map Text t -> Html toDefinitionList mkKeyFn mkValFn obj = obj & Map.toList & foldMap (\(k, v) -> Html.dt (mkKeyFn k) <> Html.dd (mkValFn v)) & Html.dl -- | Render a table-like structure of json values as an HTML table. toTable :: [[(Text, Json.Value)]] -> Html toTable xs = case xs & nonEmpty of Nothing -> [hsx|

No results.

|] Just xs' -> do let headers = xs' & NonEmpty.head <&> fst <&> (\h -> [hsx|{h}|]) & mconcat let vals = xs' & foldMap (Html.tr . foldMap (Html.td . mkVal . snd)) [hsx| {headers} {vals}
|] data TransmissionRequest = TransmissionRequest { method :: Text, arguments :: Map Text Enc, tag :: Maybe Int } deriving stock (Show) testTransmission :: (Show out) => (TransmissionRequest, Json.Parse Error out) -> IO (Either TmpPg.StartError ()) testTransmission req = runAppWith $ inSpan' "Test Transmission" $ \span -> doTransmissionRequest span transmissionConnectionConfig req >>= liftIO . printPretty transmissionConnectionConfig :: T2 "host" Text "port" Text transmissionConnectionConfig = (T2 (label @"host" "localhost") (label @"port" "9091")) transmissionRequestListAllTorrents :: (Monad m) => [Text] -> Json.ParseT e m out -> (TransmissionRequest, Json.ParseT e m [out]) transmissionRequestListAllTorrents fields parseTorrent = ( TransmissionRequest { method = "torrent-get", arguments = Map.fromList [ ("fields", Enc.list Enc.text fields) ], tag = Nothing }, Json.key "torrents" $ Json.eachInArray parseTorrent ) transmissionRequestListOnlyTorrents :: ( HasField "ids" r1 [(Label "torrentHash" Text)], HasField "fields" r1 [Text], Monad m ) => r1 -> Json.ParseT e m out -> (TransmissionRequest, Json.ParseT e m [out]) transmissionRequestListOnlyTorrents dat parseTorrent = ( TransmissionRequest { method = "torrent-get", arguments = Map.fromList [ ("ids", Enc.list (\i -> Enc.text i.torrentHash) dat.ids), ("fields", Enc.list Enc.text dat.fields) ], tag = Nothing }, Json.key "torrents" $ Json.eachInArray parseTorrent ) transmissionRequestAddTorrent :: (HasField "torrentFile" r ByteString, Monad m) => r -> ( TransmissionRequest, Json.ParseT err m (T2 "torrentHash" Text "torrentName" Text) ) transmissionRequestAddTorrent dat = ( TransmissionRequest { method = "torrent-add", arguments = Map.fromList [ ("metainfo", Enc.base64Bytes dat.torrentFile), ("paused", Enc.bool False) ], tag = Nothing }, do let p method = Json.key method $ do hash <- Json.keyLabel @"torrentHash" "hashString" Json.asText name <- Json.keyLabel @"torrentName" "name" Json.asText pure $ T2 hash name p "torrent-duplicate" Json.<|> p "torrent-added" ) data TransmissionResponse output = TransmissionResponse { result :: TransmissionResponseStatus, arguments :: Maybe output, tag :: Maybe Int } deriving stock (Show) data TransmissionResponseStatus = TransmissionResponseSuccess | TransmissionResponseFailure Text deriving stock (Show) doTransmissionRequest' :: ( MonadTransmission m, MonadThrow m, MonadLogger m, Otel.MonadTracer m, MonadUnliftIO m ) => (TransmissionRequest, Json.Parse Error output) -> m output doTransmissionRequest' req = inSpan' "Transmission Request" $ \span -> do resp <- doTransmissionRequest span transmissionConnectionConfig req case resp.result of TransmissionResponseFailure err -> appThrowTree span (nestedError "Transmission RPC error" $ singleError $ newError err) TransmissionResponseSuccess -> case resp.arguments of Nothing -> appThrowTree span "Transmission RPC error: No `arguments` field in response" Just out -> pure out -- | Contact the transmission RPC, and do the CSRF protection dance. -- -- Spec: https://github.com/transmission/transmission/blob/main/docs/rpc-spec.md doTransmissionRequest :: ( MonadTransmission m, HasField "host" t1 Text, HasField "port" t1 Text, MonadThrow m, MonadLogger m, Otel.MonadTracer m, MonadUnliftIO m ) => Otel.Span -> t1 -> (TransmissionRequest, Json.Parse Error output) -> m (TransmissionResponse output) doTransmissionRequest span dat (req, parser) = do sessionId <- getTransmissionId let textArg t = (Enc.text t, Otel.toAttribute @Text t) let encArg enc = (enc, Otel.toAttribute @Text $ enc & Enc.encToTextPretty) let intArg i = (Enc.int i, Otel.toAttribute @Int i) let body :: [(Text, (Enc, Otel.Attribute))] = ( [ ("method", req.method & textArg), ("arguments", encArg $ Enc.map id req.arguments) ] <> (req.tag & foldMap (\t -> [("tag", t & intArg)])) ) Otel.addAttributes span ( HashMap.fromList $ body <&> bimap (\k -> [fmt|transmission.{k}|]) (\(_, attr) -> attr) ) let httpReq = [fmt|http://{dat.host}:{dat.port}/transmission/rpc|] & Http.setRequestMethod "POST" & Http.setRequestBodyLBS (Enc.encToBytesUtf8Lazy (body <&> second fst & Enc.object)) & (sessionId & maybe id (Http.setRequestHeader "X-Transmission-Session-Id" . (: []))) resp <- Http.httpBS httpReq -- Implement the CSRF protection thingy case resp & Http.getResponseStatus & (.statusCode) of 409 -> do tid <- resp & Http.getResponseHeader "X-Transmission-Session-Id" & nonEmpty & annotate [fmt|Missing "X-Transmission-Session-Id" header in 409 response: {showPretty resp}|] & unwrapIOError & liftIO <&> NonEmpty.head setTransmissionId tid doTransmissionRequest span dat (req, parser) 200 -> resp & Http.getResponseBody & Json.parseStrict ( Json.mapError singleError $ do result <- Json.key "result" Json.asText <&> \case "success" -> TransmissionResponseSuccess err -> TransmissionResponseFailure err arguments <- Json.keyMay "arguments" parser tag <- Json.keyMay "tag" (Field.toJsonParser (Field.jsonNumber >>> Field.boundedScientificIntegral "tag too long")) pure TransmissionResponse {..} ) & first (Json.parseErrorTree "Cannot parse transmission RPC response") & \case Right a -> pure a Left err -> do case Json.eitherDecodeStrict' @Json.Value (resp & Http.getResponseBody) of Left _err -> pure () Right val -> logInfo [fmt|failing transmission response: {showPrettyJson val}|] appThrowTree span err _ -> liftIO $ unwrapIOError $ Left [fmt|Non-200 response: {showPretty resp}|] redactedSearch :: (MonadLogger m, MonadThrow m, Otel.MonadTracer m, MonadUnliftIO m) => [(ByteString, ByteString)] -> Json.Parse ErrorTree a -> m a redactedSearch advanced parser = inSpan' "Redacted API Search" $ \span -> redactedApiRequestJson span ( T2 (label @"action" "browse") (label @"actionArgs" ((advanced <&> second Just))) ) parser redactedGetTorrentFile :: ( MonadLogger m, MonadThrow m, HasField "torrentId" dat Int, MonadUnliftIO m, Otel.MonadTracer m ) => dat -> m ByteString redactedGetTorrentFile dat = inSpan' "Redacted Get Torrent File" $ \span -> do req <- mkRedactedApiRequest ( T2 (label @"action" "download") ( label @"actionArgs" [ ("id", Just (dat.torrentId & showToText @Int & textToBytesUtf8)) -- try using tokens as long as we have them (TODO: what if there’s no tokens left? -- ANSWER: it breaks: -- responseBody = "{\"status\":\"failure\",\"error\":\"You do not have any freeleech tokens left. Please use the regular DL link.\"}", -- ("usetoken", Just "1") ] ) ) httpTorrent span req -- fix -- ( \io -> do -- logInfo "delay" -- liftIO $ threadDelay 10_000_000 -- io -- ) exampleSearch :: (MonadThrow m, MonadLogger m, MonadPostgres m, Otel.MonadTracer m, MonadUnliftIO m) => m (Transaction m ()) exampleSearch = do t1 <- redactedSearchAndInsert [ ("searchstr", "cherish"), ("artistname", "kirinji"), -- ("year", "1982"), -- ("format", "MP3"), -- ("releasetype", "album"), ("order_by", "year") ] t3 <- redactedSearchAndInsert [ ("searchstr", "mouss et hakim"), ("artistname", "mouss et hakim"), -- ("year", "1982"), -- ("format", "MP3"), -- ("releasetype", "album"), ("order_by", "year") ] t2 <- redactedSearchAndInsert [ ("searchstr", "thriller"), ("artistname", "michael jackson"), -- ("year", "1982"), -- ("format", "MP3"), -- ("releasetype", "album"), ("order_by", "year") ] pure (t1 >> t2 >> t3) -- | Do the search, return a transaction that inserts all results from all pages of the search. redactedSearchAndInsert :: forall m. ( MonadLogger m, MonadPostgres m, MonadThrow m, Otel.MonadTracer m, MonadUnliftIO m ) => [(ByteString, ByteString)] -> m (Transaction m ()) redactedSearchAndInsert extraArguments = do logInfo [fmt|Doing redacted search with arguments: {showPretty extraArguments}|] -- The first search returns the amount of pages, so we use that to query all results piece by piece. firstPage <- go Nothing let remainingPages = firstPage.pages - 1 logInfo [fmt|Got the first page, found {remainingPages} more pages|] let otherPagesNum = [(2 :: Natural) .. remainingPages] otherPages <- traverse go (Just <$> otherPagesNum) pure $ (firstPage : otherPages) & concatMap (.tourGroups) & insertTourGroupsAndTorrents where go mpage = redactedSearch ( extraArguments -- pass the page (for every search but the first one) <> ifExists (mpage <&> (\page -> [("page", (page :: Natural) & showToText & textToBytesUtf8)])) ) ( do status <- Json.key "status" Json.asText when (status /= "success") $ do Json.throwCustomError [fmt|Status was not "success", but {status}|] Json.key "response" $ do pages <- Json.keyMay "pages" (Field.toJsonParser (Field.mapError singleError $ Field.jsonNumber >>> Field.boundedScientificIntegral @Int "not an Integer" >>> Field.integralToNatural)) -- in case the field is missing, let’s assume there is only one page <&> fromMaybe 1 Json.key "results" $ do tourGroups <- label @"tourGroups" <$> ( Json.eachInArray $ do groupId <- Json.keyLabel @"groupId" "groupId" (Json.asIntegral @_ @Int) groupName <- Json.keyLabel @"groupName" "groupName" Json.asText fullJsonResult <- label @"fullJsonResult" <$> ( Json.asObject -- remove torrents cause they are inserted separately below <&> KeyMap.filterWithKey (\k _ -> k /= "torrents") <&> Json.Object ) let tourGroup = T3 groupId groupName fullJsonResult torrents <- Json.keyLabel @"torrents" "torrents" $ Json.eachInArray $ do torrentId <- Json.keyLabel @"torrentId" "torrentId" (Json.asIntegral @_ @Int) fullJsonResultT <- label @"fullJsonResult" <$> Json.asValue pure $ T2 torrentId fullJsonResultT pure (T2 (label @"tourGroup" tourGroup) torrents) ) pure ( T2 (label @"pages" pages) tourGroups ) ) insertTourGroupsAndTorrents :: [ T2 "tourGroup" (T3 "groupId" Int "groupName" Text "fullJsonResult" Json.Value) "torrents" [T2 "torrentId" Int "fullJsonResult" Json.Value] ] -> Transaction m () insertTourGroupsAndTorrents dat = do let tourGroups = dat <&> (.tourGroup) let torrents = dat <&> (.torrents) insertTourGroups tourGroups >>= ( \res -> insertTorrents $ zipT2 $ T2 (label @"torrentGroupIdPg" $ res <&> (.tourGroupIdPg)) (label @"torrents" torrents) ) insertTourGroups :: [ T3 "groupId" Int "groupName" Text "fullJsonResult" Json.Value ] -> Transaction m [Label "tourGroupIdPg" Int] insertTourGroups dats = do let groupNames = [ [fmt|{dat.groupId}: {dat.groupName}|] | dat <- dats ] logInfo [fmt|Inserting tour groups for {showPretty groupNames}|] _ <- execute [fmt| DELETE FROM redacted.torrent_groups WHERE group_id = ANY (?::integer[]) |] (Only $ (dats <&> (.groupId) & PGArray :: PGArray Int)) executeManyReturningWith [fmt| INSERT INTO redacted.torrent_groups ( group_id, group_name, full_json_result ) VALUES ( ?, ? , ? ) ON CONFLICT (group_id) DO UPDATE SET group_id = excluded.group_id, group_name = excluded.group_name, full_json_result = excluded.full_json_result RETURNING (id) |] ( dats <&> \dat -> ( dat.groupId, dat.groupName, dat.fullJsonResult ) ) (label @"tourGroupIdPg" <$> Dec.fromField @Int) insertTorrents :: [ T2 "torrentGroupIdPg" Int "torrents" [T2 "torrentId" Int "fullJsonResult" Json.Value] ] -> Transaction m () insertTorrents dats = do _ <- execute [sql| DELETE FROM redacted.torrents_json WHERE torrent_id = ANY (?::integer[]) |] ( Only $ PGArray [ torrent.torrentId | dat <- dats, torrent <- dat.torrents ] ) execute [sql| INSERT INTO redacted.torrents_json ( torrent_group , torrent_id , full_json_result) SELECT * FROM UNNEST( ?::integer[] , ?::integer[] , ?::jsonb[] ) AS inputs( torrent_group , torrent_id , full_json_result) |] ( [ ( dat.torrentGroupIdPg :: Int, group.torrentId :: Int, group.fullJsonResult :: Json.Value ) | dat <- dats, group <- dat.torrents ] & unzip3PGArray ) pure () unzip3PGArray :: [(a1, a2, a3)] -> (PGArray a1, PGArray a2, PGArray a3) unzip3PGArray xs = xs & unzip3 & \(a, b, c) -> (PGArray a, PGArray b, PGArray c) redactedGetTorrentFileAndInsert :: ( HasField "torrentId" r Int, MonadPostgres m, MonadThrow m, MonadLogger m, Otel.MonadTracer m, MonadUnliftIO m ) => r -> Transaction m (Label "torrentFile" ByteString) redactedGetTorrentFileAndInsert dat = inSpan' "Redacted Get Torrent File and Insert" $ \span -> do bytes <- redactedGetTorrentFile dat execute [sql| UPDATE redacted.torrents_json SET torrent_file = ?::bytea WHERE torrent_id = ?::integer |] ( (Binary bytes :: Binary ByteString), dat.torrentId ) >>= assertOneUpdated span "redactedGetTorrentFileAndInsert" >>= \() -> pure (label @"torrentFile" bytes) getTorrentFileById :: ( MonadPostgres m, HasField "torrentId" r Int, MonadThrow m ) => r -> Transaction m (Maybe (Label "torrentFile" ByteString)) getTorrentFileById dat = do queryWith [sql| SELECT torrent_file FROM redacted.torrents WHERE torrent_id = ?::integer |] (Only $ (dat.torrentId :: Int)) (fmap @Maybe (label @"torrentFile") <$> Dec.byteaMay) >>= ensureSingleRow updateTransmissionTorrentHashById :: ( MonadPostgres m, HasField "torrentId" r Int, HasField "torrentHash" r Text ) => r -> Transaction m (Label "numberOfRowsAffected" Natural) updateTransmissionTorrentHashById dat = do execute [sql| UPDATE redacted.torrents_json SET transmission_torrent_hash = ?::text WHERE torrent_id = ?::integer |] ( dat.torrentHash :: Text, dat.torrentId :: Int ) assertOneUpdated :: (HasField "numberOfRowsAffected" r Natural, MonadThrow m, MonadIO m) => Otel.Span -> Text -> r -> m () assertOneUpdated span name x = case x.numberOfRowsAffected of 1 -> pure () n -> appThrowTree span ([fmt|{name :: Text}: Expected to update exactly one row, but updated {n :: Natural} row(s)|]) migrate :: ( MonadPostgres m, MonadUnliftIO m, Otel.MonadTracer m ) => Transaction m (Label "numberOfRowsAffected" Natural) migrate = inSpan "Database Migration" $ do execute_ [sql| CREATE SCHEMA IF NOT EXISTS redacted; CREATE TABLE IF NOT EXISTS redacted.torrent_groups ( id SERIAL PRIMARY KEY, group_id INTEGER, group_name TEXT, full_json_result JSONB, UNIQUE(group_id) ); CREATE TABLE IF NOT EXISTS redacted.torrents_json ( id SERIAL PRIMARY KEY, torrent_id INTEGER, torrent_group SERIAL NOT NULL REFERENCES redacted.torrent_groups(id) ON DELETE CASCADE, full_json_result JSONB, UNIQUE(torrent_id) ); ALTER TABLE redacted.torrents_json ADD COLUMN IF NOT EXISTS torrent_file bytea NULL; ALTER TABLE redacted.torrents_json ADD COLUMN IF NOT EXISTS transmission_torrent_hash text NULL; -- inflect out values of the full json CREATE OR REPLACE VIEW redacted.torrents AS SELECT t.id, t.torrent_id, t.torrent_group, -- the seeding weight is used to find the best torrent in a group. ( ((full_json_result->'seeders')::integer*3 + (full_json_result->'snatches')::integer ) -- prefer remasters by multiplying them with 3 * (CASE WHEN full_json_result->>'remasterTitle' ILIKE '%remaster%' THEN 3 ELSE 1 END) ) AS seeding_weight, t.full_json_result, t.torrent_file, t.transmission_torrent_hash FROM redacted.torrents_json t; CREATE INDEX IF NOT EXISTS torrents_json_seeding ON redacted.torrents_json(((full_json_result->'seeding')::integer)); CREATE INDEX IF NOT EXISTS torrents_json_snatches ON redacted.torrents_json(((full_json_result->'snatches')::integer)); |] data TorrentData transmissionInfo = TorrentData { groupId :: Int, torrentId :: Int, seedingWeight :: Int, torrentJson :: Json.Value, torrentGroupJson :: T2 "artist" Text "groupName" Text, torrentStatus :: TorrentStatus transmissionInfo } data TorrentStatus transmissionInfo = NoTorrentFileYet | NotInTransmissionYet | InTransmission (T2 "torrentHash" Text "transmissionInfo" transmissionInfo) getTorrentById :: (MonadPostgres m, HasField "torrentId" r Int, MonadThrow m) => r -> Transaction m Json.Value getTorrentById dat = do queryWith [sql| SELECT full_json_result FROM redacted.torrents WHERE torrent_id = ?::integer |] (getLabel @"torrentId" dat) (Dec.json Json.asValue) >>= ensureSingleRow -- | Find the best torrent for each torrent group (based on the seeding_weight) getBestTorrents :: (MonadPostgres m) => Transaction m [TorrentData ()] getBestTorrents = do queryWith [sql| SELECT * FROM ( SELECT DISTINCT ON (group_id) tg.group_id, t.torrent_id, seeding_weight, t.full_json_result AS torrent_json, tg.full_json_result AS torrent_group_json, t.torrent_file IS NOT NULL, t.transmission_torrent_hash FROM redacted.torrents t JOIN redacted.torrent_groups tg ON tg.id = t.torrent_group ORDER BY group_id, seeding_weight DESC ) as _ ORDER BY seeding_weight DESC |] () ( do groupId <- Dec.fromField @Int torrentId <- Dec.fromField @Int seedingWeight <- Dec.fromField @Int torrentJson <- Dec.json Json.asValue torrentGroupJson <- ( Dec.json $ do artist <- Json.keyLabel @"artist" "artist" Json.asText groupName <- Json.keyLabel @"groupName" "groupName" Json.asText pure $ T2 artist groupName ) hasTorrentFile <- Dec.fromField @Bool transmissionTorrentHash <- Dec.fromField @(Maybe Text) pure $ TorrentData { torrentStatus = if | not hasTorrentFile -> NoTorrentFileYet | Nothing <- transmissionTorrentHash -> NotInTransmissionYet | Just hash <- transmissionTorrentHash -> InTransmission $ T2 (label @"torrentHash" hash) (label @"transmissionInfo" ()), .. } ) inSpan :: (MonadUnliftIO m, Otel.MonadTracer m) => Text -> m a -> m a inSpan name = Otel.inSpan name Otel.defaultSpanArguments inSpan' :: (MonadUnliftIO m, Otel.MonadTracer m) => Text -> (Otel.Span -> m a) -> m a inSpan' name = Otel.inSpan' name Otel.defaultSpanArguments hush :: Either a1 a2 -> Maybe a2 hush (Left _) = Nothing hush (Right a) = Just a zipT2 :: forall l1 l2 t1 t2. ( HasField l1 (T2 l1 [t1] l2 [t2]) [t1], HasField l2 (T2 l1 [t1] l2 [t2]) [t2] ) => T2 l1 [t1] l2 [t2] -> [T2 l1 t1 l2 t2] zipT2 xs = zipWith (\t1 t2 -> T2 (label @l1 t1) (label @l2 t2)) (getField @l1 xs) (getField @l2 xs) unzipT2 :: forall l1 t1 l2 t2. [T2 l1 t1 l2 t2] -> T2 l1 [t1] l2 [t2] unzipT2 xs = xs <&> toTup & unzip & fromTup where toTup :: forall a b. T2 a t1 b t2 -> (t1, t2) toTup (T2 a b) = (getField @a a, getField @b b) fromTup :: (a, b) -> T2 l1 a l2 b fromTup (t1, t2) = T2 (label @l1 t1) (label @l2 t2) unzipT3 :: forall l1 t1 l2 t2 l3 t3. [T3 l1 t1 l2 t2 l3 t3] -> T3 l1 [t1] l2 [t2] l3 [t3] unzipT3 xs = xs <&> toTup & unzip3 & fromTup where toTup :: forall a b c. T3 a t1 b t2 c t3 -> (t1, t2, t3) toTup (T3 a b c) = (getField @a a, getField @b b, getField @c c) fromTup :: (a, b, c) -> T3 l1 a l2 b l3 c fromTup (t1, t2, t3) = T3 (label @l1 t1) (label @l2 t2) (label @l3 t3) -- | Do a request to the redacted API. If you know what that is, you know how to find the API docs. mkRedactedApiRequest :: ( MonadThrow m, MonadIO m, MonadLogger m, HasField "action" p ByteString, HasField "actionArgs" p [(ByteString, Maybe ByteString)] ) => p -> m Http.Request mkRedactedApiRequest dat = do authKey <- runCommandExpect0 "pass" ["internet/redacted/api-keys/whatcd-resolver"] pure $ [fmt|https://redacted.ch/ajax.php|] & Http.setRequestMethod "GET" & Http.setQueryString (("action", Just dat.action) : dat.actionArgs) & Http.setRequestHeader "Authorization" [authKey] httpGetJsonLd :: (MonadIO m, MonadThrow m) => Otel.Span -> Http.Request -> m Jsonld httpGetJsonLd span req = do httpJson (mkOptional (label @"contentType" "application/ld+json")) span jsonldParser ( req & Http.setRequestMethod "GET" & Http.setRequestHeader "Accept" ["application/ld+json"] ) httpTorrent :: ( MonadIO m, MonadThrow m ) => Otel.Span -> Http.Request -> m ByteString httpTorrent span req = Http.httpBS req >>= assertM span ( \resp -> do let statusCode = resp & Http.responseStatus & (.statusCode) contentType = resp & Http.responseHeaders & List.lookup "content-type" <&> Wai.parseContentType <&> (\(ct, _mimeAttributes) -> ct) if | statusCode == 200, Just "application/x-bittorrent" <- contentType -> Right $ (resp & Http.responseBody) | statusCode == 200, Just otherType <- contentType -> Left [fmt|Redacted returned a non-torrent body, with content-type "{otherType}"|] | statusCode == 200, Nothing <- contentType -> Left [fmt|Redacted returned a body with unspecified content type|] | code <- statusCode -> Left [fmt|Redacted returned an non-200 error code, code {code}: {resp & showPretty}|] ) newtype Optional a = OptionalInternal (Maybe a) mkOptional :: a -> Optional a mkOptional defaultValue = OptionalInternal $ Just defaultValue defaults :: Optional a defaults = OptionalInternal Nothing instance HasField "withDefault" (Optional a) (a -> a) where getField (OptionalInternal m) defaultValue = case m of Nothing -> defaultValue Just a -> a httpJson :: ( MonadIO m, MonadThrow m ) => (Optional (Label "contentType" ByteString)) -> Otel.Span -> Json.Parse ErrorTree b -> Http.Request -> m b httpJson opts span parser req = do let opts' = opts.withDefault (label @"contentType" "application/json") Http.httpBS req >>= assertM span ( \resp -> do let statusCode = resp & Http.responseStatus & (.statusCode) contentType = resp & Http.responseHeaders & List.lookup "content-type" <&> Wai.parseContentType <&> (\(ct, _mimeAttributes) -> ct) if | statusCode == 200, Just ct <- contentType, ct == opts'.contentType -> Right $ (resp & Http.responseBody) | statusCode == 200, Just otherType <- contentType -> Left [fmt|Server returned a non-json body, with content-type "{otherType}"|] | statusCode == 200, Nothing <- contentType -> Left [fmt|Server returned a body with unspecified content type|] | code <- statusCode -> Left [fmt|Server returned an non-200 error code, code {code}: {resp & showPretty}|] ) >>= assertM span ( \body -> Json.parseStrict parser body & first (Json.parseErrorTree "could not parse redacted response") ) redactedApiRequestJson :: ( MonadThrow m, MonadIO m, MonadLogger m, HasField "action" p ByteString, HasField "actionArgs" p [(ByteString, Maybe ByteString)] ) => Otel.Span -> p -> Json.Parse ErrorTree a -> m a redactedApiRequestJson span dat parser = do mkRedactedApiRequest dat >>= httpJson defaults span parser assertM :: (MonadThrow f, MonadIO f) => Otel.Span -> (t -> Either ErrorTree a) -> t -> f a assertM span f v = case f v of Right a -> pure a Left err -> appThrowTree span err runAppWith :: AppT IO a -> IO (Either TmpPg.StartError a) runAppWith appT = withTracer $ \tracer -> withDb $ \db -> do pgFormat <- readTools (label @"toolsEnvVar" "WHATCD_RESOLVER_TOOLS") (readTool "pg_format") let config = label @"logDatabaseQueries" LogDatabaseQueries pgConnPool <- Pool.newPool $ Pool.defaultPoolConfig {- resource init action -} (Postgres.connectPostgreSQL (db & TmpPg.toConnectionString)) {- resource destruction -} Postgres.close {- unusedResourceOpenTime -} 10 {- max resources across all stripes -} 20 transmissionSessionId <- newEmptyMVar let newAppT = do logInfo [fmt|Running with config: {showPretty config}|] logInfo [fmt|Connected to database at {db & TmpPg.toDataDirectory} on socket {db & TmpPg.toConnectionString}|] appT runReaderT newAppT.unAppT Context {..} withTracer :: (Otel.Tracer -> IO c) -> IO c withTracer f = do setDefaultEnv "OTEL_SERVICE_NAME" "whatcd-resolver" bracket -- Install the SDK, pulling configuration from the environment Otel.initializeGlobalTracerProvider -- Ensure that any spans that haven't been exported yet are flushed Otel.shutdownTracerProvider -- Get a tracer so you can create spans (\tracerProvider -> f $ Otel.makeTracer tracerProvider "whatcd-resolver" Otel.tracerOptions) setDefaultEnv :: String -> String -> IO () setDefaultEnv envName defaultValue = do Env.lookupEnv envName >>= \case Just _env -> pure () Nothing -> Env.setEnv envName defaultValue withDb :: (TmpPg.DB -> IO a) -> IO (Either TmpPg.StartError a) withDb act = do dataDir <- Xdg.getXdgDirectory Xdg.XdgData "whatcd-resolver" let databaseDir = dataDir "database" let socketDir = dataDir "database-socket" Dir.createDirectoryIfMissing True socketDir initDbConfig <- Dir.doesDirectoryExist databaseDir >>= \case True -> pure TmpPg.Zlich False -> do putStderrLn [fmt|Database does not exist yet, creating in "{databaseDir}"|] Dir.createDirectoryIfMissing True databaseDir pure TmpPg.DontCare let cfg = mempty { TmpPg.dataDirectory = TmpPg.Permanent (databaseDir), TmpPg.socketDirectory = TmpPg.Permanent socketDir, TmpPg.port = pure $ Just 5431, TmpPg.initDbConfig } TmpPg.withConfig cfg $ \db -> do -- print [fmt|data dir: {db & TmpPg.toDataDirectory}|] -- print [fmt|conn string: {db & TmpPg.toConnectionString}|] act db data Context = Context { config :: Label "logDatabaseQueries" DebugLogDatabaseQueries, tracer :: Otel.Tracer, pgFormat :: Tool, pgConnPool :: Pool Postgres.Connection, transmissionSessionId :: MVar ByteString } newtype AppT m a = AppT {unAppT :: ReaderT Context m a} deriving newtype (Functor, Applicative, Monad, MonadIO, MonadUnliftIO, MonadThrow) data AppException = AppException Text deriving stock (Show) deriving anyclass (Exception) -- | A specialized variant of @addEvent@ that records attributes conforming to -- the OpenTelemetry specification's -- -- -- @since 0.0.1.0 recordException :: ( MonadIO m, HasField "message" r Text, HasField "type_" r Text ) => Otel.Span -> r -> m () recordException span dat = liftIO $ do callStack <- GHC.Stack.whoCreated dat.message newEventTimestamp <- Just <$> Otel.getTimestamp Otel.addEvent span $ Otel.NewEvent { newEventName = "exception", newEventAttributes = HashMap.fromList [ ("exception.type", Otel.toAttribute @Text dat.type_), ("exception.message", Otel.toAttribute @Text dat.message), ("exception.stacktrace", Otel.toAttribute @Text $ Text.unlines $ map stringToText callStack) ], .. } appThrowTree :: (MonadThrow m, MonadIO m) => Otel.Span -> ErrorTree -> m a appThrowTree span exc = do let msg = prettyErrorTree exc recordException span ( T2 (label @"type_" "AppException") (label @"message" msg) ) throwM $ AppException msg orAppThrowTree :: (MonadThrow m, MonadIO m) => Otel.Span -> Either ErrorTree a -> m a orAppThrowTree span = \case Left err -> appThrowTree span err Right a -> pure a instance (MonadIO m) => MonadLogger (AppT m) where monadLoggerLog loc src lvl msg = liftIO $ Logger.defaultOutput IO.stderr loc src lvl (Logger.toLogStr msg) instance (Monad m) => Otel.MonadTracer (AppT m) where getTracer = AppT $ asks (.tracer) class MonadTransmission m where getTransmissionId :: m (Maybe ByteString) setTransmissionId :: ByteString -> m () instance (MonadIO m) => MonadTransmission (AppT m) where getTransmissionId = AppT (asks (.transmissionSessionId)) >>= tryTakeMVar setTransmissionId t = do var <- AppT $ asks (.transmissionSessionId) putMVar var t instance (MonadThrow m, MonadUnliftIO m) => MonadPostgres (AppT m) where execute = executeImpl (AppT ask) (AppT $ asks (.config.logDatabaseQueries)) execute_ = executeImpl_ (AppT ask) (AppT $ asks (.config.logDatabaseQueries)) executeMany = executeManyImpl (AppT ask) (AppT $ asks (.config.logDatabaseQueries)) executeManyReturningWith = executeManyReturningWithImpl (AppT ask) (AppT $ asks (.config.logDatabaseQueries)) queryWith = queryWithImpl (AppT ask) (AppT $ asks (.config.logDatabaseQueries)) queryWith_ = queryWithImpl_ (AppT ask) foldRows = foldRowsImpl (AppT ask) runTransaction = runPGTransaction runPGTransaction :: (MonadUnliftIO m) => Transaction (AppT m) a -> AppT m a runPGTransaction (Transaction transaction) = do pool <- AppT ask <&> (.pgConnPool) withRunInIO $ \unliftIO -> withPGTransaction pool $ \conn -> do unliftIO $ runReaderT transaction conn