Connect MySQL and Amazon S3 CSV file in our serverless environment

class MysqlSourceSelect {
    async init() {
        // TODO: Create your mysql credential
        // More info at https://yepcode.io/docs/integrations/mysql/#credential-configuration
        this.mysql = yepcode.integration.mysql("your-mysql-credential-name");
    }

    async fetch(publish, done) {
        this.mysql
            // TODO: Customize your sql query
            .query(`SELECT * FROM your_table_name`)
            .stream()
            .on("data", async (row) => {
                // TODO: map your row to an item
                const item = {
                    ...row
                };

                await publish(item);
            })
            .on("error", console.error)
            .on("end", done);
    }

    async close() {
        await this.mysql.end();
    }
}

class AwsS3TargetUploadCsv {
    async init() {
        // TODO: Create your aws-s3 credential
        // More info at https://yepcode.io/docs/integrations/aws-s3/#credential-configuration
        this.awsS3 = yepcode.integration.awsS3("your-aws-s3-credential-name");
        // Transforms the items into a csv format
        this.stringifier = csv.stringify({
            delimiter: ",",
        });
        this.targetStream = new PassThrough();
        this.stringifier.pipe(this.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
        this.upload = new Upload({
            client: this.awsS3,
            params: {
                Bucket: "your-bucket-name",
                Key: "your-file-name.csv",
                Body: this.targetStream,
            },
        });
        this.upload.on("httpUploadProgress", (progress) => {
            console.log(`Upload progress`, progress);
        });
        this.uploadPromise = this.upload.done();
    }

    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.uploadPromise;
        } catch (error) {
            console.error(`Error ending upload`, error);
        }
    }
}