Avoid creating wallets with the same name

src/Zenith/CLI.hs

@@ -212,9 +212,7 @@ appEvent (BT.VtyEvent e) = do
                    V.EvKey V.KEnter [] -> do
                      fs <- BT.zoom inputForm $ BT.gets formState
                      nw <- liftIO $ addNewWallet (fs ^. dialogInput) s
-                     BT.modify $ set wallets nw
-                     printMsg $
-                       "Creating new wallet " <> T.unpack (fs ^. dialogInput)
+                     BT.put nw
                      BT.modify $ set dialogBox Blank
                    ev -> BT.zoom inputForm $ handleFormEvent (BT.VtyEvent ev)
                AName -> do
@@ -311,12 +309,24 @@ runZenithCLI host port dbFilePath = do
         "No Zebra node available on port " <>
         show port <> ". Check your configuration"
 
-addNewWallet ::
-     T.Text -> State -> IO (L.GenericList Name Vec.Vector (Entity ZcashWallet))
+addNewWallet :: T.Text -> State -> IO State
 addNewWallet n s = do
   sP <- generateWalletSeedPhrase
   let bH = s ^. startBlock
   let netName = read $ s ^. network
-  _ <- saveWallet (s ^. dbPath) $ ZcashWallet sP bH n netName
-  wL <- getWallets (s ^. dbPath) netName
-  return $ L.listReplace (Vec.fromList wL) (Just 0) $ s ^. wallets
+  r <- saveWallet (s ^. dbPath) $ ZcashWallet sP bH n netName
+  case r of
+    Nothing -> do
+      wL <- getWallets (s ^. dbPath) netName
+      return $
+        (s & wallets .~ L.listReplace (Vec.fromList wL) (Just 0) (s ^. wallets)) &
+        msg .~
+        "Wallet already exists: " ++
+        T.unpack n
+    Just _ -> do
+      wL <- getWallets (s ^. dbPath) netName
+      return $
+        (s & wallets .~ L.listReplace (Vec.fromList wL) (Just 0) (s ^. wallets)) &
+        msg .~
+        "Created new wallet: " ++
+        T.unpack n

src/Zenith/Core.hs

@@ -24,8 +24,8 @@ initDb dbName = do
 saveWallet ::
      T.Text -- ^ The database path to use
   -> ZcashWallet -- ^ The wallet to add to the database
-  -> IO ZcashWalletId
-saveWallet dbFp w = runSqlite dbFp $ insert w
+  -> IO (Maybe (Entity ZcashWallet))
+saveWallet dbFp w = runSqlite dbFp $ insertUniqueEntity w
 
 -- | Returns a list of accounts associated with the given wallet
 getAccounts ::

src/Zenith/DB.hs

@@ -34,6 +34,7 @@ share
     birthdayHeight Int
     name T.Text
     network ZcashNet
+    UniqueWallet name network
     deriving Show
   ZcashAccount
     walletId ZcashWalletId