Connect MongoDB and Azure Blob CSV 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 AzureBlobTargetUploadCsv {
    async init() {
        // TODO: Create your azure blob credential
        // More info at https://yepcode.io/docs/integrations/azure-blob/#credential-configuration
        this.azureBlob = yepcode.integration.azureBlob(
            "your-azure-blob-credential-name"
        );
        // TODO: customize the container name and blob name to upload
        // // More info at https://docs.microsoft.com/en-us/javascript/api/@azure/storage-blob/blobserviceclient?view=azure-node-latest#@azure-storage-blob-blobserviceclient-getcontainerclient
        const containerClient = this.azureBlob.getContainerClient("container-name");
        const blockBlobClient = containerClient.getBlockBlobClient("blob-name");

        // Transforms the items into a csv format
        this.stringifier = csv.stringify({
            delimiter: ",",
        });
        this.upload = blockBlobClient.uploadStream(this.stringifier);
    }

    async consume(item) {
        // TODO: customize the csv row to create from your item content
        const csvRow = [item.value, item.text];
        this.stringifier.write(csvRow);
    }

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