refactor: correct admin server port setting

For admin server, port server-setting was set to the same port as
app server port. This doesn't have any effect because it is overridden
by the already initialized admin server socket, but it's better to
explicitly correct it to avoid anything unexpected.

Signed-off-by: Taimoor Zaeem <taimoorzaeem@gmail.com>

src/PostgREST/Admin.hs

@@ -11,7 +11,8 @@ import Control.Monad.Extra       (whenJust)
 import Network.Socket            hiding (addrFamily)
 import Network.Socket.ByteString
 
-import PostgREST.AppState    (AppState)
+import PostgREST.AppState    (AppState, getConfig)
+import PostgREST.Config      (AppConfig (..))
 import PostgREST.MediaType   (MediaType (..), toContentType)
 import PostgREST.Metrics     (metricsToText)
 import PostgREST.Network     (resolveSocketToAddress)
@@ -24,13 +25,18 @@ import           Protolude
 
 runAdmin :: AppState -> Maybe NS.Socket -> IO (Maybe NS.Socket) -> Warp.Settings -> IO ()
 runAdmin appState maybeAdminSocket getSocketREST settings = do
+  conf <- getConfig appState
   whenJust maybeAdminSocket $ \adminSocket -> do
     address <- resolveSocketToAddress adminSocket
     observer $ AdminStartObs address
-    void . forkIO $ Warp.runSettingsSocket settings adminSocket adminApp
+    void . forkIO $ Warp.runSettingsSocket (adminServerSettings conf) adminSocket adminApp
   where
     adminApp = admin appState getSocketREST
     observer = AppState.getObserver appState
+    adminServerSettings config =
+      case configAdminServerPort config of
+        Just p  -> settings & Warp.setPort p
+        Nothing -> settings
 
 -- | PostgREST admin application
 admin :: AppState.AppState -> IO (Maybe NS.Socket) -> Wai.Application