Just need to actually write and run the cron job

Application.hs

@@ -28,7 +28,7 @@ import           Yesod.Default.Main
 import           Yesod.GitRepo
 import           System.Environment (getEnvironment)
 import           System.Process (rawSystem)
-import           Stackage.Database (createStackageDatabase, openStackageDatabase)
+import           Stackage.Database.Cron (loadFromS3)
 
 import qualified Echo
 
@@ -134,16 +134,14 @@ makeFoundation useEcho conf = do
             "master"
             loadWebsiteContent
 
+    (stackageDatabase', refreshDB) <- loadFromS3
+
     -- Temporary workaround to force content updates regularly, until
     -- distribution of webhooks is handled via consul
-    void $ forkIO $ forever $ void $ tryAny $ do
-        threadDelay $ 1000 * 1000 * 60 * 20
-        grRefresh websiteContent'
-
-    let dbfile = "stackage.sqlite3"
-    createStackageDatabase dbfile
-    stackageDatabase' <- openStackageDatabase dbfile
-    -- FIXME refresh this on a regular basis
+    void $ forkIO $ forever $ void $ do
+        handleAny print $ refreshDB manager
+        threadDelay $ 1000 * 1000 * 60 * 5
+        handleAny print $ grRefresh websiteContent'
 
     env <- getEnvironment
 

Handler/Hoogle.hs

@@ -9,9 +9,12 @@ import qualified Hoogle
 import           Import
 import           Text.Blaze.Html (preEscapedToHtml)
 import Stackage.Database
+import qualified Stackage.Database.Cron as Cron
 
 getHoogleDB :: SnapName -> Handler (Maybe FilePath)
-getHoogleDB _ = return Nothing -- FIXME
+getHoogleDB name = do
+    app <- getYesod
+    liftIO $ Cron.getHoogleDB (httpManager app) name
 
 getHoogleR :: SnapName -> Handler Html
 getHoogleR name = do

Stackage/Database.hs

@@ -28,6 +28,7 @@ module Stackage.Database
     , prettyName
     , getSnapshotsForPackage
     , getSnapshots
+    , currentSchema
     ) where
 
 import Database.Sqlite (SqliteException)
@@ -393,7 +394,7 @@ prettyName name ghc =
             SNLts x y -> concat ["LTS Haskell ", tshow x, ".", tshow y]
             SNNightly d -> "Stackage Nightly " ++ tshow d
 
-getAllPackages :: GetStackageDatabase m => m [(Text, Text, Text)]
+getAllPackages :: GetStackageDatabase m => m [(Text, Text, Text)] -- FIXME add information on whether included in LTS and Nightly
 getAllPackages = liftM (map toPair) $ run $ do
     E.select $ E.from $ \p -> do
         E.orderBy [E.asc $ p E.^. PackageName]

Stackage/Database/Cron.hs

@@ -1,13 +1,83 @@
 module Stackage.Database.Cron
     ( stackageServerCron
+    , loadFromS3
+    , getHoogleDB
     ) where
 
 import ClassyPrelude.Conduit
+import Stackage.Database
+import Network.HTTP.Client
+import Network.HTTP.Client.Conduit (bodyReaderSource)
+import Filesystem (rename)
+import Web.PathPieces (toPathPiece)
+import Filesystem (isFile)
+import Network.HTTP.Types (status200)
+
+filename' :: Text
+filename' = concat
+    [ "stackage-database-"
+    , tshow currentSchema
+    , ".sqlite3"
+    ]
+
+keyName :: Text
+keyName = "stackage-database/" ++ filename'
+
+url :: Text
+url = "https://s3.amazonaws.com/haddock.stackage.org/" ++ keyName
+
+-- | Provides an action to be used to refresh the file from S3.
+loadFromS3 :: IO (StackageDatabase, Manager -> IO ())
+loadFromS3 = do
+    let fp = fpFromText filename'
+        fptmp = fp <.> "tmp"
+    req <- parseUrl $ unpack url
+    let download man = withResponse req man $ \res -> do
+            runResourceT
+                 $ bodyReaderSource (responseBody res)
+                $$ sinkFile fptmp
+            rename fptmp fp
+    db <- openStackageDatabase fp
+    return (db, download)
 
 stackageServerCron :: IO ()
 stackageServerCron = error "FIXME: stackageServerCron not implemented"
 
+
+hoogleKey :: SnapName -> Text
+hoogleKey name = concat
+    [ "hoogle/"
+    , toPathPiece name
+    , "/"
+    , VERSION_hoogle
+    , ".hoo"
+    ]
+
+hoogleUrl :: SnapName -> Text
+hoogleUrl n = "https://s3.amazonaws.com/haddock.stackage.org/" ++ hoogleKey n
+
+getHoogleDB :: Manager -> SnapName -> IO (Maybe FilePath)
+getHoogleDB man name = do
+    let fp = fpFromText $ hoogleKey name
+        fptmp = fp <.> "tmp"
+    exists <- isFile fp
+    if exists
+        then return $ Just fp
+        else do
+            req' <- parseUrl $ unpack $ hoogleUrl name
+            let req = req' { checkStatus = \_ _ _ -> Nothing }
+            withResponse req man $ \res -> if responseStatus res == status200
+                then do
+                    runResourceT $ bodyReaderSource (responseBody res)
+                                $$ sinkFile fptmp
+                    rename fptmp fp
+                    return $ Just fp
+                else do
+                    mapM brRead res >>= print
+                    return Nothing
+
 {-
+    createStackageDatabase dbfile
 
 import           Data.Streaming.Network (bindPortTCP)
 

stackage-server.cabal

@@ -173,6 +173,8 @@ library
                  , persistent-sqlite
                  , stackage-metadata >= 0.2
                  , filepath
+                 , http-client
+                 , http-types
 
 executable         stackage-server
     if flag(library-only)