Add very preliminary interface/structure for wallet getter and creation

cardano-wallet.cabal

@@ -68,6 +68,7 @@ library
       Cardano.Wallet.Binary
       Cardano.Wallet.Binary.Packfile
       Cardano.Wallet.BlockSyncer
+      Cardano.WalletLayer
       Cardano.Wallet.Mnemonic
       Cardano.Wallet.Primitive
       Servant.Extra.ContentTypes

src/Cardano/WalletLayer.hs

@@ -0,0 +1,95 @@
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE DeriveGeneric #-}
+{-# LANGUAGE DuplicateRecordFields #-}
+
+-- |
+-- Copyright: © 2018-2019 IOHK
+-- License: MIT
+--
+-- | Module provides wallet layer api that is used by API layer
+-- | and uses both DB and Networking layer to realize its role
+-- | as being intermediary between the three.
+
+
+module Cardano.WalletLayer where
+
+import Prelude
+
+import Cardano.Wallet
+    ( Wallet )
+import Cardano.Wallet.AddressDerivation
+    ( Depth (..), Key, Passphrase, XPub )
+import Cardano.Wallet.AddressDiscovery
+    ( AddressPoolGap )
+import Cardano.Wallet.Mnemonic
+    ( Mnemonic )
+import Control.Monad.Except
+    ( ExceptT )
+import Data.Text
+    ( Text )
+import Data.Time.Units
+    ( Microsecond )
+import GHC.Generics
+    ( Generic )
+
+
+
+-- | Errors
+data CreateWalletError
+
+data GetWalletError
+
+-- | Types
+data WalletLayer m s = WalletLayer
+    { createWallet :: CreateWallet -> ExceptT CreateWalletError m (Wallet s)
+    , getWallet :: WalletId -> ExceptT GetWalletError m (Wallet s)
+    }
+
+data CreateWallet =
+    CreateWallet NewWallet
+    | ImportWallet (Key 'AccountK XPub)
+
+data NewWallet = NewWallet
+    {
+      mnemonicSentence
+        :: !(Mnemonic 15)
+    , mnemonicSentencePassphrase
+        :: !(Maybe (Mnemonic 9))
+    , name
+        :: !WalletName
+    , passphrase
+        :: !(Passphrase "encryption")
+    , addressPoolGap
+        :: !AddressPoolGap
+    } deriving (Show, Generic)
+
+newtype WalletName = WalletName Text
+    deriving (Eq, Show)
+
+newtype WalletId = WalletId Text
+    deriving (Eq, Show)
+
+newtype WalletTimestamp = WalletTimestamp Microsecond
+    deriving (Eq, Ord, Show)
+
+data WalletMode = Ready | Restoring deriving (Eq, Show)
+
+data Delegation = Delegated | NotDelegated deriving (Eq, Show)
+
+newtype PassphraseInfo = PassphraseInfo { lastUpdated :: WalletTimestamp }
+    deriving (Eq, Show)
+
+data WalletMetadata = WalletMetadata {
+      id
+        :: !WalletId
+    , name
+        :: !WalletName
+    , addressPoolGap
+        :: !AddressPoolGap
+    , passphraseInfo
+        :: !PassphraseInfo
+    , state
+        :: !WalletMode
+    , delegation
+        :: !Delegation
+    } deriving (Eq, Show, Generic)