5 files changed, 51 insertions, 67 deletions
diff --git a/haskell/src/SpaceTraders/Database/Agents.hs b/haskell/src/SpaceTraders/Database/Agents.hs
index 49ae11f..d596d79 100644
--- a/haskell/src/SpaceTraders/Database/Agents.hs
+++ b/haskell/src/SpaceTraders/Database/Agents.hs
@@ -1,24 +1,24 @@
 {-# LANGUAGE OverloadedStrings #-}
 
 module SpaceTraders.Database.Agents
-  ( addAgent
-  , getAgent
+  ( getAgent
   , setAgent
   ) where
 
-import Control.Monad.Reader
-import Data.Aeson
-import qualified Database.SQLite.Simple as S
+import           Control.Monad.Error.Class
+import           Control.Monad.Reader
+import           Data.Aeson
+import qualified Database.SQLite.Simple    as S
 
-import SpaceTraders
-import SpaceTraders.Model.Agent
-import SpaceTraders.Utils
-
-addAgent :: (HasDatabaseConn env, MonadIO m, MonadReader env m) => Agent -> m ()
-addAgent agent = execute "INSERT INTO agents(data) VALUES (json(?));" (S.Only (encode agent))
+import           SpaceTraders
+import           SpaceTraders.Model.Agent
+import           SpaceTraders.Utils
 
 getAgent :: (HasDatabaseConn env, MonadIO m, MonadReader env m) => m Agent
-getAgent = one_ "SELECT data FROM agents";
+getAgent = one_ "SELECT data FROM agents"; -- we only support one agent at a time
 
-setAgent :: (HasDatabaseConn env, MonadIO m, MonadReader env m) => Agent -> m ()
-setAgent agent = execute "UPDATE agents SET data = json(?);" (S.Only (encode agent))
+setAgent :: (HasDatabaseConn env, MonadError e m, MonadIO m, MonadReader env m) => Agent -> m ()
+setAgent agent = updateAgent `catchError` addAgent
+  where
+    addAgent _ = execute "INSERT INTO agents(data) VALUES (json(?));" (S.Only $ encode agent)
+    updateAgent = execute "UPDATE agents SET data = json(?);" (S.Only (encode agent))
diff --git a/haskell/src/SpaceTraders/Database/Contracts.hs b/haskell/src/SpaceTraders/Database/Contracts.hs
index 20170ba..7cebc37 100644
--- a/haskell/src/SpaceTraders/Database/Contracts.hs
+++ b/haskell/src/SpaceTraders/Database/Contracts.hs
@@ -1,31 +1,24 @@
 {-# LANGUAGE OverloadedStrings #-}
 
 module SpaceTraders.Database.Contracts
-  ( addContract
-  , getContracts
+  ( getContracts
   , setContract
-  , updateContract
   ) where
 
-import Control.Monad.Reader
-import Data.Aeson
-import qualified Database.SQLite.Simple as S
+import           Control.Monad.Error.Class
+import           Control.Monad.Reader
+import           Data.Aeson
+import qualified Database.SQLite.Simple      as S
 
-import SpaceTraders
-import SpaceTraders.Model.Contract
-import SpaceTraders.Utils
-
-addContract :: (HasDatabaseConn env, MonadIO m, MonadReader env m) => Contract -> m ()
-addContract contract = execute "INSERT INTO contracts(data) VALUES (json(?));" (S.Only (encode contract))
+import           SpaceTraders
+import           SpaceTraders.Model.Contract
+import           SpaceTraders.Utils
 
 getContracts :: (HasDatabaseConn env, MonadIO m, MonadReader env m) => m [Contract]
 getContracts = query_ "SELECT data FROM contracts;"
 
-setContract :: (HasDatabaseConn env, MonadFail m, MonadIO m, MonadReader env m) => Contract -> m ()
-setContract contract = do
-  c <- count "SELECT count(id) FROM contracts WHERE data->>'contractId' = ?;" (S.Only $ contractId contract)
-  if c == 0 then addContract contract
-            else updateContract contract
-
-updateContract :: (HasDatabaseConn env, MonadIO m, MonadReader env m) => Contract -> m ()
-updateContract contract = execute "UPDATE contracts SET data = json(?) WHERE data->>'contractId' = ?;" (encode contract, contractId contract)
+setContract :: (HasDatabaseConn env, MonadError e m, MonadIO m, MonadReader env m) => Contract -> m ()
+setContract contract = updateContract `catchError` addContract
+  where
+    addContract _ = execute "INSERT INTO contracts(data) VALUES (json(?));" (S.Only (encode contract))
+    updateContract = execute "UPDATE contracts SET data = json(?) WHERE data->>'contractId' = ?;" (encode contract, contractId contract)
diff --git a/haskell/src/SpaceTraders/Database/Ships.hs b/haskell/src/SpaceTraders/Database/Ships.hs
index 5a2ab7c..eabf429 100644
--- a/haskell/src/SpaceTraders/Database/Ships.hs
+++ b/haskell/src/SpaceTraders/Database/Ships.hs
@@ -1,31 +1,24 @@
 {-# LANGUAGE OverloadedStrings #-}
 
 module SpaceTraders.Database.Ships
-  ( addShip
-  , getShips
+  ( getShips
   , setShip
-  , updateShip
   ) where
 
-import Control.Monad.Reader
-import Data.Aeson
-import qualified Database.SQLite.Simple as S
+import           Control.Monad.Error.Class
+import           Control.Monad.Reader
+import           Data.Aeson
+import qualified Database.SQLite.Simple    as S
 
-import SpaceTraders
-import SpaceTraders.Model.Ship
-import SpaceTraders.Utils
-
-addShip :: (HasDatabaseConn env, MonadIO m, MonadReader env m) => Ship -> m ()
-addShip ship = execute "INSERT INTO ships(data) VALUES (json(?));" (S.Only $ encode ship)
+import           SpaceTraders
+import           SpaceTraders.Model.Ship
+import           SpaceTraders.Utils
 
 getShips :: (HasDatabaseConn env, MonadIO m, MonadReader env m) => m [Ship]
 getShips = query_ "SELECT data FROM ships;"
 
-setShip :: (HasDatabaseConn env, MonadFail m, MonadIO m, MonadReader env m) => Ship -> m ()
-setShip ship = do
-  c <- count "SELECT count(id) FROM ships WHERE data->>'symbol' = ?;" (S.Only $ symbol ship)
-  if c == 0 then addShip ship
-            else updateShip ship
-
-updateShip :: (HasDatabaseConn env, MonadIO m, MonadReader env m) => Ship -> m ()
-updateShip ship = execute "UPDATE ships SET data = json(?) WHERE data->>'symbol' = ?;" (encode ship, symbol ship)
+setShip :: (HasDatabaseConn env, MonadError e m, MonadIO m, MonadReader env m) => Ship -> m ()
+setShip ship = updateShip `catchError` addShip
+  where
+    addShip _ = execute "INSERT INTO ships(data) VALUES (json(?));" (S.Only $ encode ship)
+    updateShip = execute "UPDATE ships SET data = json(?) WHERE data->>'symbol' = ?;" (encode ship, symbol ship)
diff --git a/haskell/src/SpaceTraders/Database/Systems.hs b/haskell/src/SpaceTraders/Database/Systems.hs
index 07749be..7c43caf 100644
--- a/haskell/src/SpaceTraders/Database/Systems.hs
+++ b/haskell/src/SpaceTraders/Database/Systems.hs
@@ -5,13 +5,13 @@ module SpaceTraders.Database.Systems
   , getSystems
   ) where
 
-import Control.Monad.Reader
-import Data.Aeson
-import qualified Database.SQLite.Simple as S
+import           Control.Monad.Reader
+import           Data.Aeson
+import qualified Database.SQLite.Simple    as S
 
-import SpaceTraders
-import SpaceTraders.Model.System
-import SpaceTraders.Utils
+import           SpaceTraders
+import           SpaceTraders.Model.System
+import           SpaceTraders.Utils
 
 addSystems :: (HasDatabaseConn env, MonadIO m, MonadReader env m) => [System] -> m ()
 addSystems systems = do
diff --git a/haskell/src/SpaceTraders/Database/Tokens.hs b/haskell/src/SpaceTraders/Database/Tokens.hs
index e99e49e..0a29a55 100644
--- a/haskell/src/SpaceTraders/Database/Tokens.hs
+++ b/haskell/src/SpaceTraders/Database/Tokens.hs
@@ -1,21 +1,19 @@
 {-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE QuasiQuotes #-}
 
 module SpaceTraders.Database.Tokens
   ( addToken
   , getToken
   ) where
 
-import Control.Monad.Reader
+import           Control.Monad.Reader
+import qualified Data.Text              as T
 import qualified Database.SQLite.Simple as S
-import qualified Data.Text as T
 
-import SpaceTraders
+import           SpaceTraders
+import           SpaceTraders.Utils
 
 addToken :: (HasDatabaseConn env, MonadIO m, MonadReader env m) => T.Text -> m ()
-addToken value = do
-  env <- ask
-  liftIO $ S.execute (getConn env) "INSERT INTO tokens(data) VALUES (?);" (S.Only value)
+addToken value = execute "INSERT INTO tokens(data) VALUES (?);" (S.Only value)
 
 getToken :: (HasDatabaseConn env, MonadFail m, MonadIO m, MonadReader env m) => m T.Text
 getToken = do