Retrieve file from FTP, unzip file, save extract file to Amazon S3 bucket

Attempting to retrieve a file from FTP and save it to an S3 bucket within lambda function.

I can confirm the first part of the code works as I can see the list of files printed to Cloudwatch logs.

import ftplib
from ftplib import FTP
import zipfile
import boto3

    s3 = boto3.client('s3')
    S3_OUTPUT_BUCKETNAME = 'my-s3bucket' 

    ftp = FTP('ftp.godaddy.com')
  
    ftp.login(user='auctions', passwd='')
  
    ftp.retrlines('LIST')

The next part was resulting in the following error:

module initialization error: [Errno 30] Read-only file system: 'tdnam_all_listings.csv.zip'

However I managed to overcome this by adding 'tmp' to the file location as per following code:

fileName = 'all_expiring_auctions.json.zip'


with open('/tmp/fileName', 'wb') as file:
    ftp.retrbinary('RETR ' + fileName, file.write)

Next, I am attempting to unzip the file from the temporary loaction

with zipfile.ZipFile('/tmp/fileName', 'r') as zip_ref:
        zip_ref.extractall('')

Finally, I am attempting save the file to a particular 'folder' in the s3 bucket, as follows:

data = open('/tmp/all_expiring_auctions.json')

s3.Bucket('brnddmn-s3').upload_fileobj('data','my-s3bucket/folder/')

The code produces no errors that I can see in the log, however the unzipped file is not reaching the destination despite my efforts.

Any help greatly appreciated.

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