Factor out resolveAddr function

This function can be useful to many parts of the code to convert the string
representation of an IP (v4 or v6) address into the proper data type.

Signed-off-by: Michele Tartara <mtartara@google.com>
Reviewed-by: Helga Velroyen <helgav@google.com>

src/Ganeti/Daemon.hs

@@ -263,20 +263,6 @@ defaultBindAddr port Socket.AF_INET6 =
       Socket.SockAddrInet6 (fromIntegral port) 0 Socket.iN6ADDR_ANY 0)
 defaultBindAddr _ fam = Bad $ "Unsupported address family: " ++ show fam
 
--- | Default hints for the resolver
-resolveAddrHints :: Maybe Socket.AddrInfo
-resolveAddrHints =
-  Just Socket.defaultHints { Socket.addrFlags = [Socket.AI_NUMERICHOST,
-                                                 Socket.AI_NUMERICSERV] }
-
--- | Resolves a numeric address.
-resolveAddr :: Int -> String -> IO (Result (Socket.Family, Socket.SockAddr))
-resolveAddr port str = do
-  resolved <- Socket.getAddrInfo resolveAddrHints (Just str) (Just (show port))
-  return $ case resolved of
-             [] -> Bad "Invalid results from lookup?"
-             best:_ -> Ok (Socket.addrFamily best, Socket.addrAddress best)
-
 -- | Based on the options, compute the socket address to use for the
 -- daemon.
 parseAddress :: DaemonOptions      -- ^ Command line options

src/Ganeti/Utils.hs

@@ -56,6 +56,7 @@ module Ganeti.Utils
   , exitIfEmpty
   , splitEithers
   , recombineEithers
+  , resolveAddr
   ) where
 
 import Data.Char (toUpper, isAlphaNum, isDigit, isSpace)
@@ -64,6 +65,7 @@ import Data.List
 import Control.Monad (foldM)
 
 import Debug.Trace
+import Network.Socket
 
 import Ganeti.BasicTypes
 import qualified Ganeti.Constants as C
@@ -431,3 +433,16 @@ recombineEithers lefts rights trail =
           recombiner (_,  ls, rs) t = Bad $ "Inconsistent trail log: l=" ++
                                       show ls ++ ", r=" ++ show rs ++ ",t=" ++
                                       show t
+
+-- | Default hints for the resolver
+resolveAddrHints :: Maybe AddrInfo
+resolveAddrHints =
+  Just defaultHints { addrFlags = [AI_NUMERICHOST, AI_NUMERICSERV] }
+
+-- | Resolves a numeric address.
+resolveAddr :: Int -> String -> IO (Result (Family, SockAddr))
+resolveAddr port str = do
+  resolved <- getAddrInfo resolveAddrHints (Just str) (Just (show port))
+  return $ case resolved of
+             [] -> Bad "Invalid results from lookup?"
+             best:_ -> Ok (addrFamily best, addrAddress best)