Bootstrapped my haskell client

3 files changed, 88 insertions, 0 deletions

diff --git a/haskell/src/SpaceTraders/Database.hs b/haskell/src/SpaceTraders/Database.hs
new file mode 100644
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+++ b/haskell/src/SpaceTraders/Database.hs
@@ -0,0 +1,56 @@
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE QuasiQuotes #-}
+
+module SpaceTraders.Database
+  ( close
+  , open
+  ) where
+
+import Control.Exception
+import qualified Database.SQLite.Simple as S
+import Text.RawString.QQ
+
+migrations :: [S.Query]
+migrations = [
+  [r|CREATE TABLE schema_version (
+       version INTEGER NOT NULL
+     );
+  |],
+  [r|CREATE TABLE tokens (
+       id INTEGER PRIMARY KEY,
+       data TEXT NOT NULL
+     );
+  |],
+  [r|CREATE TABLE agents (
+       id INTEGER PRIMARY KEY,
+       data TEXT NOT NULL
+     );
+  |],
+  [r|CREATE TABLE contracts (
+       id INTEGER PRIMARY KEY,
+       data TEXT NOT NULL
+     );
+  |]]
+
+close :: S.Connection -> IO ()
+close conn = S.close conn
+
+open :: IO S.Connection
+open = do
+  conn <- S.open "spacetraders.db"
+  S.execute_ conn "PRAGMA foreign_keys = ON;"
+  S.execute_ conn "PRAGMA journal_mode = WAL;"
+  S.withTransaction conn $ do
+    version <- getSchemaVersion conn `catch` defaultVersion
+    mapM_ (S.execute_ conn) $ drop version migrations
+    S.execute_ conn "DELETE FROM schema_version;"
+    S.execute conn "INSERT INTO schema_version (version) VALUES (?);" (S.Only $ length migrations)
+  return conn
+
+getSchemaVersion :: S.Connection -> IO Int
+getSchemaVersion conn = do
+  [[v]] <- S.query_ conn "SELECT version FROM schema_version;"
+  return v
+
+defaultVersion :: SomeException -> IO Int
+defaultVersion _ = return 0
diff --git a/haskell/src/SpaceTraders/Database/Agents.hs b/haskell/src/SpaceTraders/Database/Agents.hs
new file mode 100644
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+++ b/haskell/src/SpaceTraders/Database/Agents.hs
@@ -0,0 +1,14 @@
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE QuasiQuotes #-}
+
+module SpaceTraders.Database.Agents
+  ( setAgent
+  ) where
+
+import Data.Aeson
+import qualified Database.SQLite.Simple as S
+
+import SpaceTraders.Model.Agent
+
+setAgent :: S.Connection -> Agent -> IO ()
+setAgent conn agent = S.execute conn "INSERT INTO agents(data) VALUES (json(?));" (S.Only (encode agent))
diff --git a/haskell/src/SpaceTraders/Database/Tokens.hs b/haskell/src/SpaceTraders/Database/Tokens.hs
new file mode 100644
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+++ b/haskell/src/SpaceTraders/Database/Tokens.hs
@@ -0,0 +1,18 @@
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE QuasiQuotes #-}
+
+module SpaceTraders.Database.Tokens
+  ( getToken
+  , setToken
+  ) where
+
+import qualified Database.SQLite.Simple as S
+import qualified Data.Text as T
+
+getToken :: S.Connection -> IO (T.Text)
+getToken conn = do
+  [[token]] <- S.query_ conn "SELECT data FROM tokens;"
+  return token
+
+setToken :: S.Connection -> T.Text -> IO ()
+setToken conn value = S.execute conn "INSERT INTO tokens(data) VALUES (?);" (S.Only value)