Refactoring Python 2.7 Code to Utilize Boto3 for AWS S3 Operations Instead of Boto
I'm working on a project and hit a roadblock... Recently started working on a cloud application that heavily interacts with AWS S3 for storage. The original implementation was using the Boto library, but with AWS encouraging the move to Boto3, I’ve been tasked with refactoring this code. The existing setup looks something like this: ```python import boto from boto.s3.key import Key conn = boto.connect_s3() # This is the Boto connection method bucket = conn.get_bucket('my-bucket') key = Key(bucket) key.key = 'myfile.txt' key.set_contents_from_string('This is a test file.') ``` The challenge arises when trying to replicate the same upload functionality using Boto3. I want to ensure that I maintain the same logic while taking advantage of the new features in Boto3. So far, I’ve tried this approach: ```python import boto3 s3 = boto3.client('s3') s3.put_object(Bucket='my-bucket', Key='myfile.txt', Body='This is a test file.') ``` While this works for simple uploads, I need to address handling larger files efficiently. The existing Boto code handles multipart uploads for files larger than 5MB. How do I replicate that in Boto3? I’ve looked into `upload_fileobj` and `create_multipart_upload`, but I’m struggling with the implementation details. Here's my current attempt at multipart upload: ```python import boto3 from boto3.s3.transfer import S3Transfer s3 = boto3.client('s3') transfer = S3Transfer(s3) file_path = 'path/to/large_file.bin' transfer.upload_file(file_path, 'my-bucket', 'large_file.bin') ``` This seems to use the multipart upload behind the scenes, but I’d like to see if there's a way to explicitly handle multipart uploads, especially when it comes to handling errors and retries during the upload process. Any insights or best practices for using Boto3 with multipart uploads would be greatly appreciated. Additionally, if there's a specific error handling pattern that works well with Boto3 in this context, that would be helpful too. This is part of a larger API I'm building. For context: I'm using Python 2.7 on Linux. I'd really appreciate any guidance on this.