1 files changed, 84 insertions, 0 deletions
diff --git a/server/utils/simple-migration-server.js b/server/utils/simple-migration-server.js
new file mode 100644
index 0000000..680f8df
--- /dev/null
+++ b/server/utils/simple-migration-server.js
@@ -0,0 +1,84 @@
+const express = require("express");
+const http = require("node:http");
+const { log } = require("../../src/util");
+
+/**
+ * SimpleMigrationServer
+ * For displaying the migration status of the server
+ * Also, it is used to let Docker healthcheck know the status of the server, as the main server is not started yet, healthcheck will think the server is down incorrectly.
+ */
+class SimpleMigrationServer {
+    /**
+     * Express app instance
+     * @type {?Express}
+     */
+    app;
+
+    /**
+     * Server instance
+     * @type {?Server}
+     */
+    server;
+
+    /**
+     * Response object
+     * @type {?Response}
+     */
+    response;
+
+    /**
+     * Start the server
+     * @param {number} port Port
+     * @param {string} hostname Hostname
+     * @returns {Promise<void>}
+     */
+    start(port, hostname) {
+        this.app = express();
+        this.server = http.createServer(this.app);
+
+        this.app.get("/", (req, res) => {
+            res.set("Content-Type", "text/plain");
+            res.write("Migration is in progress, listening message...\n");
+            if (this.response) {
+                this.response.write("Disconnected\n");
+                this.response.end();
+            }
+            this.response = res;
+            // never ending response
+        });
+
+        return new Promise((resolve) => {
+            this.server.listen(port, hostname, () => {
+                if (hostname) {
+                    log.info("migration", `Migration server is running on http://${hostname}:${port}`);
+                } else {
+                    log.info("migration", `Migration server is running on http://localhost:${port}`);
+                }
+                resolve();
+            });
+        });
+    }
+
+    /**
+     * Update the message
+     * @param {string} msg Message to update
+     * @returns {void}
+     */
+    update(msg) {
+        this.response?.write(msg + "\n");
+    }
+
+    /**
+     * Stop the server
+     * @returns {Promise<void>}
+     */
+    async stop() {
+        this.response?.write("Finished, please refresh this page.\n");
+        this.response?.end();
+        await this.server?.close();
+    }
+}
+
+module.exports = {
+    SimpleMigrationServer,
+};