feat(db): init mongo and passing komga conf

src/lib/mongodb.ts

@@ -0,0 +1,51 @@
+import mongoose from "mongoose";
+
+const MONGODB_URI = process.env.MONGODB_URI;
+
+if (!MONGODB_URI) {
+  throw new Error(
+    "Veuillez définir la variable d'environnement MONGODB_URI dans votre fichier .env"
+  );
+}
+
+interface MongooseCache {
+  conn: typeof mongoose | null;
+  promise: Promise<typeof mongoose> | null;
+}
+
+declare global {
+  var mongoose: MongooseCache | undefined;
+}
+
+let cached: MongooseCache = global.mongoose || { conn: null, promise: null };
+
+if (!global.mongoose) {
+  global.mongoose = { conn: null, promise: null };
+}
+
+async function connectDB(): Promise<typeof mongoose> {
+  if (cached.conn) {
+    return cached.conn;
+  }
+
+  if (!cached.promise) {
+    const opts = {
+      bufferCommands: false,
+    };
+
+    cached.promise = mongoose.connect(MONGODB_URI!, opts).then((mongoose) => {
+      return mongoose;
+    });
+  }
+
+  try {
+    cached.conn = await cached.promise;
+  } catch (e) {
+    cached.promise = null;
+    throw e;
+  }
+
+  return cached.conn;
+}
+
+export default connectDB;