introduced yarn workspace

packages/api/src/controllers/serverConnections.js

@@ -0,0 +1,44 @@
+
+const connections = require('./connections');
+const socket = require('../utility/socket');
+const { fork } = require('child_process');
+
+module.exports = {
+  opened: [],
+
+  handle_databases(conid, { databases }) {
+    const existing = this.opened.find(x => x.conid == conid);
+    if (!existing) return;
+    existing.databases = databases;
+    socket.emit(`database-list-changed-${conid}`);
+  },
+  handle_error(conid, { error }) {
+    console.log(`Error in server connection ${conid}: ${error}`);
+  },
+
+  async ensureOpened(conid) {
+    const existing = this.opened.find(x => x.conid == conid);
+    if (existing) return existing;
+    const connection = await connections.get({ conid });
+    const subprocess = fork(`${__dirname}/../proc/serverConnectionProcess.js`);
+    const newOpened = {
+      conid,
+      subprocess,
+      databases: [],
+      connection,
+    };
+    this.opened.push(newOpened);
+    // @ts-ignore
+    subprocess.on('message', ({ msgtype, ...message }) => {
+      this[`handle_${msgtype}`](conid, message);
+    });
+    subprocess.send({ msgtype: 'connect', ...connection });
+    return newOpened;
+  },
+
+  listDatabases_meta: 'get',
+  async listDatabases({ conid }) {
+    const opened = await this.ensureOpened(conid);
+    return opened.databases;
+  },
+};