Refacor electron app and add migrations

electron/ipc/cqrs.ts

@@ -0,0 +1,39 @@
+import { ipcMain } from 'electron';
+import { buildCommandHandlers } from '../cqrs/commands';
+import { buildQueryHandlers } from '../cqrs/queries';
+import {
+  Command,
+  Query,
+  CommandTypeKey,
+  QueryTypeKey
+} from '../cqrs/types';
+import { getDataSource } from '../db/database';
+
+export function setupCqrsHandlers(): void {
+  const dataSource = getDataSource();
+
+  if (!dataSource) {
+    throw new Error('DataSource not initialised');
+  }
+
+  const commandHandlerMap = buildCommandHandlers(dataSource) as Record<CommandTypeKey, (command: Command) => unknown>;
+  const queryHandlerMap = buildQueryHandlers(dataSource) as Record<QueryTypeKey, (query: Query) => unknown>;
+
+  ipcMain.handle('cqrs:command', async (_evt, command: Command) => {
+    const handler = commandHandlerMap[command.type as CommandTypeKey];
+
+    if (!handler)
+      throw new Error(`No command handler for type: ${command.type}`);
+
+    return handler(command);
+  });
+
+  ipcMain.handle('cqrs:query', async (_evt, query: Query) => {
+    const handler = queryHandlerMap[query.type as QueryTypeKey];
+
+    if (!handler)
+      throw new Error(`No query handler for type: ${query.type}`);
+
+    return handler(query);
+  });
+}