Add a DbImport class implementing the import interface.

[dead/htsn-import.git] / src / Main.hs

diff --git a/src/Main.hs b/src/Main.hs
index d2e51727f9468b58417c0ecbb7ba71cdefeef324..568f0fe99f55c48b105ab31e04fd5e99d12dd08b 100644 (file)
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -1,18 +1,145 @@
+{-# LANGUAGE NoMonomorphismRestriction #-}
 module Main
 where
 
-import Text.Show.Pretty ( ppShow )
-import Text.XML.HXT.Core
+import Control.Arrow ( (&&&), arr, returnA )
+import Control.Monad ( when )
+import Control.Monad.IO.Class ( MonadIO, liftIO )
+import Database.Groundhog.Generic ( runDbConn )
+import Database.Groundhog.Sqlite (
+  withSqliteConn )
+import Database.Groundhog.Postgresql (
+  withPostgresqlConn )
+import Data.Monoid ( (<>) )
+import Network.Services.TSN.Logging ( init_logging )
+import System.Console.CmdArgs ( def )
+import System.Exit ( exitWith, ExitCode (ExitFailure) )
+import System.IO.Error ( catchIOError )
+import Text.XML.HXT.Core (
+  ArrowXml,
+  IOStateArrow,
+  XmlTree,
+  (>>>),
+  (/>),
+  getAttrl,
+  getText,
+  hasName,
+  readDocument,
+  runX )
+
+import Backend ( Backend(..) )
+import CommandLine ( get_args )
+import Configuration ( Configuration(..), merge_optional )
+import ConnectionString ( ConnectionString(..) )
+import ExitCodes ( exit_no_xml_files )
+import qualified OptionalConfiguration as OC (
+  OptionalConfiguration ( xml_files ),
+  from_rc )
+import Network.Services.TSN.Report (
+  report_info,
+  report_error )
+import TSN.DbImport
+import qualified TSN.Injuries as Injuries ( Listing )
+import qualified TSN.InjuriesDetail as InjuriesDetail ( PlayerListing )
+import qualified TSN.News as News ( Message )
+import Xml ( parse_opts )
+
+
+
+import_file :: Configuration -> FilePath -> IO ()
+import_file cfg path = do
+  results <- catchIOError
+               parse_and_import
+               (\e -> do
+                  report_error (show e)
+                  report_error $ "Failed to import file " ++ path ++ "."
+                  -- Return a nonempty list so we don't claim incorrectly that
+                  -- we couldn't parse the DTD.
+                  return [ Nothing ] )
+
+  case results of
+    -- If results' is empty, one of the arrows return "nothing."
+    []    -> report_error $ "Unable to determine DTD for file " ++ path ++ "."
+    (r:_) ->
+      case r of
+        Nothing -> return ()
+        Just cnt -> report_info $ "Successfully imported " ++
+                                  (show cnt) ++
+                                  " records from " ++ path ++ "."
+  where
+    -- | An arrow that reads a document into an 'XmlTree'.
+    readA :: IOStateArrow s a XmlTree
+    readA = readDocument parse_opts path
+
+    -- | An arrow which parses the doctype "SYSTEM" of an 'XmlTree'.
+    --   We use these to determine the parser to use.
+    doctypeA :: ArrowXml a => a XmlTree String
+    doctypeA = getAttrl >>> hasName "doctype-SYSTEM" /> getText
+
+    -- | Combine the arrows above as well as the function below
+    --   (arrowized with 'arr') into an IO action that does everything
+    --   (parses and then runs the import on what was parsed).
+    --
+    --   The result of runX has type IO [IO (Maybe Int)]. We thus use
+    --   bind (>>=) and sequence to combine all of the IOs into one
+    --   big one outside of the list.
+    parse_and_import :: IO [Maybe Int]
+    parse_and_import =
+      runX (readA >>> (doctypeA &&& returnA) >>> (arr import_with_dtd))
+      >>=
+      sequence
+
+    -- | Takes a 'Doctype', 'XmlTree' pair and uses the 'Doctype' to
+    --   determine which function to call on the 'XmlTree'.
+    import_with_dtd :: (String, XmlTree) -> IO (Maybe Int)
+    import_with_dtd (dtd,xml) =
+      -- We need NoMonomorphismRestriction here.
+      if backend cfg == Postgres
+      then withPostgresqlConn cs $ runDbConn $ importer xml
+      else withSqliteConn cs $ runDbConn $ importer xml
+      where
+        -- | Pull the real connection String out  of the configuration.
+        cs :: String
+        cs = get_connection_string $ connection_string cfg
+
+        importer
+          | dtd == "injuriesxml.dtd" =
+              dbimport (undefined :: Injuries.Listing)
+
+          | dtd == "Injuries_Detail_XML.dtd" =
+              dbimport (undefined :: InjuriesDetail.PlayerListing)
+
+          | dtd == "newsxml.dtd" =
+              dbimport (undefined :: News.Message)
+
+          | otherwise = \_ -> do -- Dummy arg simplifies the other cases.
+              let errmsg = "Unrecognized DTD in " ++ path ++ ": " ++ dtd ++ "."
+              liftIO $ report_info errmsg
+              return Nothing
 
-import qualified TSN.Injuries as Injuries
 
 
 main :: IO ()
 main = do
-  res <- runX ( xunpickleDocument Injuries.pickle_message
-                       [ withValidate no
-                       , withTrace 1
-                       , withRemoveWS yes
-                       , withPreserveComment no
-                       ] "test/xml/injuriesxml.xml" )
-  putStr $ ppShow res
+  rc_cfg <- OC.from_rc
+  cmd_cfg <- get_args
+
+  -- Merge the config file options with the command-line ones,
+  -- prefering the command-line ones.
+  let opt_config = rc_cfg <> cmd_cfg
+
+  -- Update a default config with any options that have been set in
+  -- either the config file or on the command-line.  We initialize
+  -- logging before the missing parameter checks below so that we can
+  -- log the errors.
+  let cfg = (def :: Configuration) `merge_optional` opt_config
+  init_logging (log_file cfg) (log_level cfg) (syslog cfg)
+
+  -- Check the optional config for missing required options.
+  when (null $ OC.xml_files opt_config) $ do
+    report_error "No XML files given."
+    exitWith (ExitFailure exit_no_xml_files)
+
+  -- We don't do this in parallel (for now?) to keep the error
+  -- messages nice and linear.
+  mapM_ (import_file cfg) (OC.xml_files opt_config)