Multipart upload using boto3

Question

I am following below doc for multipart upload using boto3, but not able to perform the same. can you walk me through concept and syntax for same?

http://boto3.readthedocs.io/en/latest/reference/services/s3.html#S3.Client.create_multipart_upload

http://boto3.readthedocs.io/en/latest/reference/services/s3.html#S3.Client.complete_multipart_upload

Answer 1

From this document:

Using the Transfer Manager

boto3 provides interfaces for managing various types of transfers with S3. Functionality includes:

Automatically managing multipart and non-multipart uploads

To ensure that multipart uploads only happen when absolutely necessary, you can use the multipart_threshold configuration parameter:

Use the following python code that uploads file to s3 and manages automatic multipart uploads.

import argparse
import boto3
import botocore
import os
import pandas as pd
from boto3.s3.transfer import TransferConfig

def environment_set(access_key,secret_access_key):
    os.environ["AWS_ACCESS_KEY_ID"] = access_key
    os.environ["AWS_SECRET_ACCESS_KEY"] = secret_access_key

def s3_upload_file(args):     
    while True:
    try:
        s3 = boto3.resource('s3')

        GB = 1024 ** 3

            # Ensure that multipart uploads only happen if the size of a transfer
            # is larger than S3's size limit for nonmultipart uploads, which is 5 GB.
            config = TransferConfig(multipart_threshold=5 * GB)

        s3.meta.client.upload_file(args.path, args.bucket, os.path.basename(args.path),Config=config)
        print "S3 Uploading successful"
        break
    except botocore.exceptions.EndpointConnectionError:
        print "Network Error: Please Check your Internet Connection"
    except Exception, e:
        print e


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='UPLOAD A FILE TO PRE-EXISTING S3 BUCKET')
    parser.add_argument('path', metavar='PATH', type=str,
            help='Enter the Path to file to be uploaded to s3')
    parser.add_argument('bucket', metavar='BUCKET_NAME', type=str,
            help='Enter the name of the bucket to which file has to be uploaded')
    parser.add_argument('cred', metavar='CREDENTIALS', type=str,
            help='Enter the Path to credentials.csv, having AWS access key and secret access key')    
    args = parser.parse_args()
    df = pd.read_csv(args.cred, header=None)
    access_key = df.iloc[1,1]
    secret_access_key = df.iloc[1,2]
    environment_set(access_key,secret_access_key)
    s3_upload_file(args)