start slowly

app/Main.hs

@@ -5,6 +5,8 @@
 {-# LANGUAGE FlexibleContexts #-}
 module Main where
 
+import Prelude as P
+
 import Servant
 import Servant.Server.Experimental.Auth
 
@@ -21,6 +23,8 @@ import qualified Data.CaseInsensitive as CI
 import Data.IP
 
 import Database.PostgreSQL.Simple
+import Database.PostgreSQL.Simple.Migration
+import Database.PostgreSQL.Simple.Util
 
 import Network.Wai
 import Network.Wai.Logger
@@ -81,17 +85,24 @@ main = do
             "password='" <> fromString (T.unpack db_passwd) <> "'"
             )
           store <- newTVarIO S.empty
-          tracker <- newTVarIO M.empty
-          void $ execute_ conn initAvatar
-          void $ execute_ conn initUser
-          void $ execute_ conn initProduct
-          void $ execute_ conn initToken
-          void $ execute_ conn initAuthData
-          void $ execute_ conn initAmount
-          void $ execute_ conn initJournal
-          void $ execute_ conn initRole
-          void $ execute_ conn initUserToRole
-          runInsertInitialRole
+          -- tracker <- newTVarIO M.empty
+          migrationsExist <- existsTable conn "schema_migrations"
+          when (not migrationsExist) $ do
+            withTransaction conn $
+              void $ do
+                runMigration $
+                  MigrationContext MigrationInitialization True conn
+                execute_ conn initAvatar
+                execute_ conn initUser
+                execute_ conn initProduct
+                execute_ conn initToken
+                execute_ conn initAuthData
+                execute_ conn initAmount
+                execute_ conn initJournal
+                execute_ conn initRole
+                execute_ conn initUserToRole
+                runInsertInitialRole
+          -- TODO: check for Migrations
           forkCleanProcess conn store
           withStdoutLogger $ \ilog -> do
             let settings = setPort (fromIntegral lport) $

mateamt.cabal

@@ -34,6 +34,7 @@ executable mateamt
                      , mtl
                      , opaleye
                      , postgresql-simple
+                     , postgresql-simple-migration
                      , stm
                      , network
                      , servant

shell.nix

@@ -5,12 +5,13 @@ let
   inherit (nixpkgs) pkgs;
 
   f = { mkDerivation, aeson, base, base16-bytestring
-      , base64-bytestring, bytestring, case-insensitive, containers
-      , HsYAML, http-api-data, http-types, iproute, mtl, network, opaleye
-      , optparse-applicative, postgresql-simple, product-profunctors
-      , profunctors, pureMD5, random-bytestring, servant, servant-rawm
-      , servant-server, stdenv, stm, text, time, wai, wai-logger
-      , wai-middleware-throttle, warp
+      , base64-bytestring, bytestring, case-insensitive, clock
+      , containers, HsYAML, http-api-data, http-types, iproute, mtl
+      , network, opaleye, optparse-applicative, postgresql-simple
+      , postgresql-simple-migration, product-profunctors, profunctors
+      , pureMD5, random-bytestring, servant, servant-rawm, servant-server
+      , stdenv, stm, text, time, wai, wai-logger, wai-middleware-throttle
+      , warp
       }:
       mkDerivation {
         pname = "mateamt";
@@ -25,10 +26,11 @@ let
           servant-rawm servant-server stm text time wai wai-logger warp
         ];
         executableHaskellDepends = [
-          base base16-bytestring bytestring case-insensitive containers
+          base base16-bytestring bytestring case-insensitive clock containers
           HsYAML iproute mtl network opaleye optparse-applicative
-          postgresql-simple servant servant-server stm text time wai
-          wai-logger wai-middleware-throttle warp
+          postgresql-simple postgresql-simple-migration servant
+          servant-server stm text time wai wai-logger wai-middleware-throttle
+          warp
         ];
         description = "A whole new matemat";
         license = stdenv.lib.licenses.agpl3;