Connect MongoDB and Amazon S3 NDJSON file in our serverless environment

class MongodbSourceSelect {
    async init() {
        // TODO: Create your mongodb credential
        // More info at https://yepcode.io/docs/integrations/mongodb/#credential-configuration
        this.mongodb = yepcode.integration.mongodb("your-mongodb-credential-name");
        await this.mongodb.connect();
        // TODO: Customize your db and collection names
        const db = this.mongodb.db("your-db-name");
        this.collection = db.collection("your-collection-name");
    }

    async fetch(publish, done) {
        this.collection.find({}).stream().on("data", publish).on("end", done);
    }

    async close() {
        await this.mongodb.close();
    }
}

class AwsS3TargetUploadNdjson {
    async init() {
        // TODO: Create your aws-s3 credential
        // More info at https://yepcode.io/docs/integrations/aws-s3/#credential-configuration
        const awsS3 = yepcode.integration.awsS3("your-aws-s3-credential-name");
        // Transforms the items into a ndjson format
        this.stringifier = ndjson.stringify();
        const targetStream = new PassThrough();
        this.stringifier.pipe(targetStream);
        // TODO: customize the Upload content
        // More info at: https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/interfaces/_aws_sdk_lib_storage.options-1.html
        const upload = new Upload({
            client: awsS3,
            params: {
                Bucket: "your-bucket-name",
                Key: "your-file-name.ndjson",
                Body: targetStream,
            },
        });
        upload.on("httpUploadProgress", (progress) => {
            console.log(`Upload progress`, progress);
        });
        this.uploadPromise = upload.done();
    }

    async consume(item) {
        this.stringifier.write(item);
    }

    async close() {
        try {
            this.stringifier.end();
        } catch (error) {
            console.error(`Error ending stringifier`, error);
        }
        try {
            await this.uploadPromise;
        } catch (error) {
            console.error(`Error ending upload`, error);
        }
    }
}