+{-# LANGUAGE PatternGuards #-}
+
module Main
where
+import Data.List ( foldl' )
+import qualified Data.Map as Map ( Map, alter, empty )
+import Data.Maybe ( catMaybes )
+import Data.Monoid ( (<>) )
+import Database.HDBC (
+ IConnection,
+ SqlValue,
+ disconnect,
+ safeFromSql,
+ quickQuery )
+import Database.HDBC.PostgreSQL ( connectPostgreSQL )
+import System.Console.CmdArgs ( def )
+
+import CommandLine ( get_args )
+import Configuration ( Configuration(..), merge_optional )
+import qualified OptionalConfiguration as OC ( from_rc )
+
+type Domain = String
+type Username = String
+type Count = Int
+
+-- | A wrapper around a (domain, count) pair to keep things type-safe.
+data DomainCount = DomainCount Domain Count
+
+instance Show DomainCount where
+ -- | Display a DomainCount in the form \"domain: count\".
+ --
+ -- Examples:
+ --
+ -- >>> let dc = DomainCount "example.com" 100
+ -- >>> show dc
+ -- "example.com: 100"
+ --
+ show (DomainCount domain count) = domain ++ ": " ++ (show count)
+
+
+-- | A wrapper around a (domain, user) pair to keep things type-safe.
+data DomainUser =
+ DomainUser Domain Username
+ deriving (Show)
+
+
+-- | In the detailed report, we store the usernames as a map from a
+-- domain name to a list of usernames. This type synonym is the type
+-- of that map.
+type DomainUserMap = Map.Map Domain [Username]
+
+
+-- | Convert a list of [SqlByteString, SqlInt32] to 'DomainCount's. If
+-- the conversion doesn't work for some reason (bad data, not enough
+-- columns, etc.), we return 'Nothing'.
+--
+-- Examples:
+--
+-- >>> import Database.HDBC ( iToSql, toSql )
+--
+-- >>> list_to_domain_count [toSql "example.com", iToSql 100]
+-- Just example.com: 100
+--
+-- >>> list_to_domain_count [toSql "example.com"]
+-- Nothing
+--
+-- >>> list_to_domain_count [toSql "example.com", toSql "example.com"]
+-- Nothing
+--
+list_to_domain_count :: [SqlValue] -> Maybe DomainCount
+list_to_domain_count (domain:count:_)
+ | Right d <- safeFromSql domain,
+ Right c <- safeFromSql count = Just $ DomainCount d c
+list_to_domain_count _ =
+ Nothing
+
+
+-- | Convert a list of [SqlByteString, SqlByteString] to 'DomainUser's. If
+-- the conversion doesn't work for some reason (bad data, not enough
+-- columns, etc.), we return 'Nothing'.
+--
+-- Examples:
+--
+-- >>> import Database.HDBC ( toSql )
+-- >>>
+-- >>> list_to_domain_user [toSql "example.com", toSql "user1"]
+-- Just (DomainUser "example.com" "user1")
+--
+-- >>> list_to_domain_user [toSql "example.com"]
+-- Nothing
+--
+list_to_domain_user :: [SqlValue] -> Maybe DomainUser
+list_to_domain_user (domain:user:_)
+ | Right d <- safeFromSql domain,
+ Right u <- safeFromSql user = Just $ DomainUser d u
+list_to_domain_user _ =
+ Nothing
+
+
+report_summary :: IConnection a => a -> IO String
+report_summary conn = do
+ list_rows <- quickQuery conn query []
+ let maybe_domain_counts = map list_to_domain_count list_rows
+ let domain_counts = catMaybes maybe_domain_counts
+ return $ header ++ (concatMap show domain_counts)
+ where
+ header = "mailbox-count summary report" ++
+ "----------------------------"
+
+ query = "SELECT domain,COUNT(username) " ++
+ "FROM mailbox " ++
+ "GROUP BY domain "++
+ "ORDER BY domain;"
+
+
+-- | Construct a Domain -> [Username] (a DomainUserMap) map from a
+-- list of 'DomainUser's. We do this with a fold over the list of
+-- 'DomainUser's, appending each new user to the list associated
+-- with the domain that the user is paired with.
+--
+-- The [Username] lists (the values stored in the map) are kept in
+-- the same order as they are given.
+--
+-- Examples:
+--
+-- >>> let du1 = DomainUser "example.com" "user1"
+-- >>> let du2 = DomainUser "example.com" "user2"
+-- >>> let du3 = DomainUser "example.net" "user3"
+-- >>> construct_domain_user_map [du1,du2,du3]
+-- fromList [("example.com",["user1","user2"]),("example.net",["user3"])]
+--
+-- >>> construct_domain_user_map [du2,du1,du3]
+-- fromList [("example.com",["user2","user1"]),("example.net",["user3"])]
+--
+construct_domain_user_map :: [DomainUser] -> DomainUserMap
+construct_domain_user_map dus =
+ foldl' append_this_du Map.empty dus
+ where
+ append_func :: Username -> (Maybe [Username]) -> (Maybe [Username])
+ append_func user maybe_userlist =
+ case maybe_userlist of
+ Just userlist -> Just (userlist ++ [user])
+ Nothing -> Just [user]
+
+ append_this_du :: DomainUserMap -> DomainUser -> DomainUserMap
+ append_this_du du_map (DomainUser domain user) =
+ Map.alter (append_func user) domain du_map
+
+
+report_detail :: IConnection a => a -> IO String
+report_detail conn = do
+ list_rows <- quickQuery conn query []
+ let maybe_domain_users = map list_to_domain_user list_rows
+ let domain_users = catMaybes maybe_domain_users
+ let domain_users_map = construct_domain_user_map domain_users
+ return ""
+ where
+ query = "SELECT domain,username " ++
+ "FROM mailbox " ++
+ "ORDER BY domain;"
+
+
+report_both :: IConnection a => a -> IO String
+report_both conn = do
+ rs <- report_summary conn
+ rd <- report_detail conn
+ return (rs ++ rd)
+
+report :: IConnection a => a -> Bool -> Bool -> IO String
+report conn do_both do_detail =
+ if do_both
+ then (report_both conn)
+ else if do_detail then (report_detail conn) else (report_summary conn)
+
+
+connection_string :: Configuration -> String
+connection_string cfg =
+ "host=" ++ (host cfg) ++ " " ++
+ "port=" ++ (show $ port cfg) ++ " " ++
+ "user=" ++ (username cfg) ++ " " ++
+ "password=" ++ (password cfg) ++ " " ++
+ "dbname=" ++ (database cfg)
+
main :: IO ()
main = do
- putStrLn "Hello, world!"
+ 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
+
+ -- Check the optional config for missing required options.
+ --when (isNothing (OC.password opt_config)) $ do
+ -- report_error "No password supplied."
+ -- exitWith (ExitFailure exit_no_password)
+
+ --when (isNothing (OC.username opt_config)) $ do
+ -- report_error "No username supplied."
+ --exitWith (ExitFailure exit_no_username)
+
+ conn <- connectPostgreSQL (connection_string cfg)
+ r <- report conn (both cfg) (detail cfg)
+ putStrLn r
+ disconnect conn
projects / mailbox-count.git / blobdiff