WIP: migrations

source/db/db.d

@@ -23,6 +23,7 @@ class DB {
   protected DBSettings m_settings;
   protected DataSource m_ds;
   protected Connection m_conn;
+  protected Statement m_stmt = null;
 
   this(DBSettings settings) {
     this.m_settings = settings;
@@ -46,5 +47,42 @@ class DB {
   void connect() {
     this.m_ds = this.getDataSource();
     this.m_conn = this.m_ds.getConnection();
+    this.m_conn.setAutoCommit(false);
+  }
+
+  int runUpdate(string statement) {
+    if (this.m_stmt is null)
+      this.m_stmt = this.m_conn.createStatement();
+
+    debugF!"Running update: %s"(statement);
+
+    return this.m_stmt.executeUpdate(statement);
+  }
+
+  ResultSet runQuery(string statement) {
+    if (this.m_stmt is null)
+      this.m_stmt = this.m_conn.createStatement();
+
+    debugF!"Running query: %s"(statement);
+
+    return this.m_stmt.executeQuery(statement);
+  }
+
+  void runMigrations() {
+    ResultSet rs = this.runQuery(
+      `select * from information_schema.tables where table_name = 'migrations';`,
+    );
+
+    bool exists = rs.next();
+    int ret = 0;
+
+    if (exists == false) {
+      ret |= this.runUpdate(
+        `create table migrations(
+          id serial,
+          name character varying
+        )`,
+      );
+    }
   }
 }

source/db/migrations/m_001_initial.d

@@ -0,0 +1,25 @@
+module db.migrations.m_001_initial;
+
+import db.migrations.migration;
+
+Migration Initial = Migration(
+  [
+  `create table users(
+    id uuid not null,
+    name character varying(255),
+    handle character varying(255),
+    local boolean not null,
+    ap_id character varying(255) not null,
+    ap_privkey text,
+    ap_pubkey text,
+    ap_shared_inbox text,
+    ap_inbox text,
+    ap_outbox text,
+    ap_followers_addr text,
+    ap_following_addr text
+  );`
+],
+  [
+  `drop table users;`
+],
+);

source/db/migrations/migration.d

@@ -0,0 +1,31 @@
+module db.migrations.migration;
+
+import singletons;
+import db.migrations.m_001_initial;
+
+struct Migration {
+  string[] upStatements;
+  string[] downStatements;
+
+  bool up() {
+    int result;
+
+    foreach (string statement; upStatements)
+      result |= Db.runUpdate(statement);
+
+    return result == 0;
+  }
+
+  bool down() {
+    int result;
+
+    foreach (string statement; downStatements)
+      result |= Db.runUpdate(statement);
+
+    return result == 0;
+  }
+}
+
+Migration[string] migrations = [
+  "001_initial": Initial,
+];

source/db/types.d

@@ -0,0 +1,17 @@
+module db.types;
+
+class User {
+  string id;
+  string name;
+  string handle;
+  bool local;
+
+  string ap_id;
+  string ap_privkey;
+  string ap_pubkey;
+  string ap_shared_inbox;
+  string ap_inbox;
+  string ap_outbox;
+  string ap_followers_addr;
+  string ap_following_addr;
+}