Add Scotty: Haskell web framework on Warp (first Haskell entry!)

frameworks/scotty/Dockerfile

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+FROM haskell:9.8-slim AS builder
+
+# Fix archived bullseye repos and install build dependencies
+RUN sed -i 's|deb.debian.org|archive.debian.org|g' /etc/apt/sources.list && \
+    sed -i '/bullseye-updates/d' /etc/apt/sources.list && \
+    sed -i '/bullseye-security/d' /etc/apt/sources.list && \
+    apt-get -o Acquire::Check-Valid-Until=false update && \
+    apt-get install -y --no-install-recommends --allow-downgrades \
+      libsqlite3-0=3.34.1-3 libsqlite3-dev libpq-dev zlib1g-dev pkg-config && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /build
+
+COPY scotty-bench.cabal .
+RUN cabal update && \
+    cabal build --only-dependencies \
+      --constraint='postgresql-libpq-configure < 0.11'
+
+COPY Main.hs .
+RUN cabal build \
+      --constraint='postgresql-libpq-configure < 0.11' && \
+    cp $(cabal list-bin scotty-bench) /build/scotty-bench
+
+FROM debian:bookworm-slim
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends libpq5 libsqlite3-0 zlib1g libgmp10 && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+COPY --from=builder /build/scotty-bench /app/scotty-bench
+
+EXPOSE 8080
+
+CMD ["/app/scotty-bench"]

frameworks/scotty/Main.hs

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+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE BangPatterns #-}
+
+module Main where
+
+import Web.Scotty
+import Network.Wai (Request, rawQueryString, requestMethod, requestHeaders, getRequestBodyChunk)
+import Network.Wai.Handler.Warp (defaultSettings, setPort)
+import Network.HTTP.Types.Status (status404, status500)
+import Network.HTTP.Types.Method (methodPost)
+
+import qualified Data.ByteString as BS
+import qualified Data.ByteString.Lazy as BL
+import qualified Data.ByteString.Char8 as BC
+import qualified Data.ByteString.Lazy.Char8 as BLC
+import qualified Data.Text as T
+import qualified Data.Text.Lazy as TL
+import qualified Data.Text.Encoding as TE
+import Data.Aeson (FromJSON, Value(..), encode, eitherDecodeStrict, object, (.=), (.:))
+import qualified Data.Aeson as Aeson
+import qualified Data.Aeson.Types as Aeson
+
+import qualified Codec.Compression.GZip as GZip
+import qualified Codec.Compression.Zlib as Zlib
+
+import qualified Database.SQLite.Simple as SQLite
+import qualified Database.PostgreSQL.Simple as PG
+
+import Data.IORef
+import Data.Maybe (fromMaybe, mapMaybe)
+import Data.Char (isSpace)
+import qualified Data.Map.Strict as Map
+import System.Environment (lookupEnv)
+import System.Directory (doesFileExist, doesDirectoryExist, listDirectory)
+import System.FilePath (takeExtension, (</>))
+import Control.Monad (when, forM)
+import Control.Monad.IO.Class (liftIO)
+import Control.Exception (try, SomeException, bracket)
+import Text.Read (readMaybe)
+
+-- Dataset item as loaded from JSON
+data DatasetItem = DatasetItem
+  { diId       :: !Int
+  , diName     :: !T.Text
+  , diCategory :: !T.Text
+  , diPrice    :: !Double
+  , diQuantity :: !Int
+  , diActive   :: !Bool
+  , diTags     :: ![T.Text]
+  , diRating   :: !RatingVal
+  } deriving (Show)
+
+data RatingVal = RatingVal
+  { rvScore :: !Double
+  , rvCount :: !Int
+  } deriving (Show)
+
+instance FromJSON RatingVal where
+  parseJSON = Aeson.withObject "RatingVal" $ \v ->
+    RatingVal <$> v .: "score" <*> v .: "count"
+
+instance FromJSON DatasetItem where
+  parseJSON = Aeson.withObject "DatasetItem" $ \v ->
+    DatasetItem
+      <$> v .: "id"
+      <*> v .: "name"
+      <*> v .: "category"
+      <*> v .: "price"
+      <*> v .: "quantity"
+      <*> v .: "active"
+      <*> v .: "tags"
+      <*> v .: "rating"
+
+-- Build processed JSON Value from DatasetItem (with total field)
+processedItemValue :: DatasetItem -> Value
+processedItemValue di = object
+  [ "id"       .= diId di
+  , "name"     .= diName di
+  , "category" .= diCategory di
+  , "price"    .= diPrice di
+  , "quantity" .= diQuantity di
+  , "active"   .= diActive di
+  , "tags"     .= diTags di
+  , "rating"   .= object ["score" .= rvScore (diRating di), "count" .= rvCount (diRating di)]
+  , "total"    .= (fromIntegral (round (diPrice di * fromIntegral (diQuantity di) * 100) :: Int) / 100.0 :: Double)
+  ]
+
+-- Parse query string: "?a=1&b=2" -> sum of integer values
+parseQuerySum :: BS.ByteString -> Int
+parseQuerySum qs =
+  let qs' = if not (BS.null qs) && BS.head qs == 63 {- '?' -} then BS.drop 1 qs else qs
+      pairs = BC.split '&' qs'
+      parseVal pair = case BC.split '=' pair of
+        [_, v] -> readMaybe (BC.unpack v) :: Maybe Int
+        _      -> Nothing
+  in sum $ mapMaybe parseVal pairs
+
+-- MIME type lookup
+mimeForExt :: String -> BS.ByteString
+mimeForExt ".css"   = "text/css"
+mimeForExt ".js"    = "application/javascript"
+mimeForExt ".html"  = "text/html"
+mimeForExt ".woff2" = "font/woff2"
+mimeForExt ".svg"   = "image/svg+xml"
+mimeForExt ".webp"  = "image/webp"
+mimeForExt ".json"  = "application/json"
+mimeForExt _        = "application/octet-stream"
+
+main :: IO ()
+main = do
+  -- Load dataset
+  datasetPath <- fromMaybe "/data/dataset.json" <$> lookupEnv "DATASET_PATH"
+  datasetItems <- do
+    exists <- doesFileExist datasetPath
+    if exists
+      then do
+        raw <- BS.readFile datasetPath
+        case eitherDecodeStrict raw of
+          Right items -> return (items :: [DatasetItem])
+          Left _      -> return []
+      else return []
+
+  -- Pre-compute large JSON payload for compression endpoint
+  largePayload <- do
+    exists <- doesFileExist "/data/dataset-large.json"
+    if exists
+      then do
+        raw <- BS.readFile "/data/dataset-large.json"
+        case eitherDecodeStrict raw of
+          Right items -> do
+            let processed = map processedItemValue (items :: [DatasetItem])
+                resp = encode $ object ["items" .= processed, "count" .= length processed]
+            return (Just (BL.toStrict resp))
+          Left _ -> return Nothing
+      else return Nothing
+
+  -- Load static files into memory
+  staticCache <- do
+    let dir = "/data/static"
+    exists <- doesDirectoryExist dir
+    if exists
+      then do
+        files <- listDirectory dir
+        entries <- forM files $ \name -> do
+          content <- BS.readFile (dir </> name)
+          let ct = mimeForExt (takeExtension name)
+          return (name, (content, ct))
+        return (Map.fromList entries)
+      else return Map.empty
+
+  -- SQLite connection (read-only)
+  dbRef <- newIORef (Nothing :: Maybe SQLite.Connection)
+  do
+    exists <- doesFileExist "/data/benchmark.db"
+    when exists $ do
+      conn <- SQLite.open "/data/benchmark.db"
+      SQLite.execute_ conn "PRAGMA mmap_size=268435456"
+      writeIORef dbRef (Just conn)
+
+  -- Postgres URL
+  pgUrl <- lookupEnv "DATABASE_URL"
+
+  let opts = Options 0 (setPort 8080 defaultSettings) False
+
+  scottyOpts opts $ do
+
+    -- Pipeline test: GET /pipeline -> "ok"
+    get "/pipeline" $ do
+      setHeader "Server" "scotty"
+      text "ok"
+
+    -- Baseline HTTP/1.1: GET|POST /baseline11
+    let handleBaseline = do
+          req <- request
+          let qSum = parseQuerySum (rawQueryString req)
+          bodySum <- if requestMethod req == methodPost
+            then do
+              b <- body
+              let trimmed = BLC.dropWhile isSpace b
+              return $ fromMaybe 0 (readMaybe (BLC.unpack trimmed) :: Maybe Int)
+            else return 0
+          setHeader "Server" "scotty"
+          text $ TL.pack $ show (qSum + bodySum)
+
+    get "/baseline11" handleBaseline
+    post "/baseline11" handleBaseline
+
+    -- Baseline HTTP/2: GET /baseline2
+    get "/baseline2" $ do
+      req <- request
+      let qSum = parseQuerySum (rawQueryString req)
+      setHeader "Server" "scotty"
+      text $ TL.pack $ show qSum
+
+    -- JSON processing: GET /json
+    get "/json" $ do
+      let items = map processedItemValue datasetItems
+          resp = encode $ object ["items" .= items, "count" .= length items]
+      setHeader "Server" "scotty"
+      setHeader "Content-Type" "application/json"
+      raw resp
+
+    -- Compression: GET /compression
+    get "/compression" $ do
+      case largePayload of
+        Nothing -> do
+          status status500
+          text "No dataset"
+        Just payload -> do
+          req <- request
+          let ae = fromMaybe "" $ lookup "Accept-Encoding" (requestHeaders req)
+          setHeader "Server" "scotty"
+          setHeader "Content-Type" "application/json"
+          if "deflate" `BS.isInfixOf` ae
+            then do
+              setHeader "Content-Encoding" "deflate"
+              raw $ Zlib.compressWith
+                Zlib.defaultCompressParams { Zlib.compressLevel = Zlib.bestSpeed }
+                (BL.fromStrict payload)
+            else if "gzip" `BS.isInfixOf` ae
+              then do
+                setHeader "Content-Encoding" "gzip"
+                raw $ GZip.compressWith
+                  GZip.defaultCompressParams { GZip.compressLevel = GZip.bestSpeed }
+                  (BL.fromStrict payload)
+              else raw (BL.fromStrict payload)
+
+    -- Upload: POST /upload -> byte count (streaming to avoid buffering entire body)
+    post "/upload" $ do
+      req <- request
+      totalBytes <- liftIO $ countBodyBytes req
+      setHeader "Server" "scotty"
+      text $ TL.pack $ show totalBytes
+
+    -- SQLite DB: GET /db
+    get "/db" $ do
+      mConn <- liftIO $ readIORef dbRef
+      case mConn of
+        Nothing -> do
+          setHeader "Server" "scotty"
+          setHeader "Content-Type" "application/json"
+          raw "{\"items\":[],\"count\":0}"
+        Just conn -> do
+          minP <- paramWithDefault "min" 10.0
+          maxP <- paramWithDefault "max" 50.0
+          rows <- liftIO $ SQLite.query conn
+            "SELECT id, name, category, price, quantity, active, tags, rating_score, rating_count FROM items WHERE price BETWEEN ? AND ? LIMIT 50"
+            (minP :: Double, maxP :: Double)
+          let items = map sqliteRowToValue rows
+              resp = encode $ object ["items" .= items, "count" .= length items]
+          setHeader "Server" "scotty"
+          setHeader "Content-Type" "application/json"
+          raw resp
+
+    -- Async DB (PostgreSQL): GET /async-db
+    get "/async-db" $ do
+      setHeader "Server" "scotty"
+      setHeader "Content-Type" "application/json"
+      case pgUrl of
+        Nothing -> raw "{\"items\":[],\"count\":0}"
+        Just url -> do
+          minP <- paramWithDefault "min" 10.0
+          maxP <- paramWithDefault "max" 50.0
+          result <- liftIO $ try $ bracket
+            (PG.connectPostgreSQL (BC.pack url))
+            PG.close
+            (\conn -> PG.query conn
+              "SELECT id, name, category, price, quantity, active, tags::text, rating_score, rating_count FROM items WHERE price BETWEEN ? AND ? LIMIT 50"
+              (minP :: Double, maxP :: Double))
+          case result of
+            Left (_ :: SomeException) -> raw "{\"items\":[],\"count\":0}"
+            Right rows -> do
+              let items = map pgRowToValue rows
+              raw $ encode $ object ["items" .= items, "count" .= length items]
+
+    -- Static files: GET /static/:filename
+    get "/static/:filename" $ do
+      filename <- pathParam "filename" :: ActionM T.Text
+      let key = T.unpack filename
+      case Map.lookup key staticCache of
+        Just (content, ct) -> do
+          setHeader "Server" "scotty"
+          setHeader "Content-Type" (TL.fromStrict (TE.decodeUtf8 ct))
+          raw (BL.fromStrict content)
+        Nothing -> do
+          status status404
+          text "Not Found"
+
+-- Stream request body and count bytes without buffering
+countBodyBytes :: Request -> IO Int
+countBodyBytes req = go 0
+  where
+    go !acc = do
+      chunk <- getRequestBodyChunk req
+      if BS.null chunk
+        then return acc
+        else go (acc + BS.length chunk)
+
+-- Helper: get query parameter with default
+paramWithDefault :: String -> Double -> ActionM Double
+paramWithDefault name def = do
+  mv <- queryParamMaybe (TL.pack name)
+  case mv of
+    Nothing -> return def
+    Just v  -> return $ fromMaybe def (readMaybe (TL.unpack v) :: Maybe Double)
+
+-- Convert SQLite row to JSON Value
+sqliteRowToValue :: (Int, T.Text, T.Text, Double, Int, Int, T.Text, Double, Int) -> Value
+sqliteRowToValue (rid, name, category, price, quantity, active, tagsJson, rScore, rCount) =
+  let tags = fromMaybe ([] :: [T.Text]) (Aeson.decodeStrict (TE.encodeUtf8 tagsJson))
+  in object
+    [ "id"       .= rid
+    , "name"     .= name
+    , "category" .= category
+    , "price"    .= price
+    , "quantity" .= quantity
+    , "active"   .= (active == 1)
+    , "tags"     .= tags
+    , "rating"   .= object ["score" .= rScore, "count" .= rCount]
+    ]
+
+-- Convert PostgreSQL row to JSON Value
+pgRowToValue :: (Int, T.Text, T.Text, Double, Int, Bool, T.Text, Double, Int) -> Value
+pgRowToValue (rid, name, category, price, quantity, active, tagsJson, rScore, rCount) =
+  let tags = fromMaybe ([] :: [Value]) (Aeson.decodeStrict (TE.encodeUtf8 tagsJson))
+  in object
+    [ "id"       .= rid
+    , "name"     .= name
+    , "category" .= category
+    , "price"    .= price
+    , "quantity" .= quantity
+    , "active"   .= active
+    , "tags"     .= tags
+    , "rating"   .= object ["score" .= rScore, "count" .= rCount]
+    ]

frameworks/scotty/meta.json

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+{
+  "display_name": "Scotty",
+  "language": "Haskell",
+  "type": "framework",
+  "engine": "warp",
+  "description": "Scotty web framework on Warp, a lightweight Haskell framework inspired by Ruby's Sinatra.",
+  "repo": "https://github.com/scotty-web/scotty",
+  "enabled": true,
+  "tests": [
+    "baseline",
+    "pipelined",
+    "noisy",
+    "limited-conn",
+    "json",
+    "upload",
+    "compression",
+    "mixed",
+    "async-db",
+    "static"
+  ]
+}