A sample S3 file uploader which uses DynamoDB to manage a list of files.

coinlocker.py

#!/usr/bin/env python

# [coinlocker]
#
# Copyright (c) 2014 Yuta Imai
#
# This software is released under the MIT License.
#
# http://opensource.org/licenses/mit-license.php

from filechunkio import FileChunkIO
import math
import os
import re
import sys
import time
from optparse import OptionParser

import boto
import boto.dynamodb2
import boto.s3
import boto.s3.bucket
import boto.s3.key

boto.debug = 2

chunk_size = 1024 * 1024 * 5

parser = OptionParser()
parser.add_option("-r", "--region", dest="region",
                  help="Region for S3 and DynamoDB")
parser.add_option("-b", "--bucket", dest="bucket",
                  help="S3 Bucket name")
parser.add_option("-p", "--prefix", dest="prefix",
                  help="Prefix for file names on S3")
parser.add_option("-t", "--table", dest="table",
                  help="DynamoDB table name")
parser.add_option("-d", "--dir", dest="directory",
                  help="Root of target directory")
(options, args) = parser.parse_args()

s3          = boto.s3.connect_to_region(options.region)
s3bucket    = boto.s3.bucket.Bucket(connection=s3,name=options.bucket)
dynamo      = boto.dynamodb2.connect_to_region(options.region)

def lock_key(key):
  try:
    dynamo.put_item(
      options.table,
      {'filename' : {'S': key}, 'status': {'S': 'uploaded'}},
      expected = {
        'filename' : { "Exists" : False }
      }
    )
    return True
  except Exception,e:
    return False

def scan_dir(target):
    os.chdir(target)
    keys   = os.listdir(target)
    result = []
    for key in keys:
        if os.path.isdir(key):
            absolute_path = target + '/' + key
            result.append(absolute_path)
    return result

def find_dirs(root):
    to_go   = [root]
    result  = [root]
    while(len(to_go)):
        target = to_go.pop(0)
        scan_result = scan_dir(target)
        to_go.extend(scan_result)
        result.extend(scan_result)
    return 
    
def upload_files(target):
    os.chdir(target)
    keys = os.listdir(target)
    for key in keys:
        absolute_file_path = target + '/' + key
        if(os.path.isfile(absolute_file_path)):
            if lock_key(absolute_file_path):
              s3key_name = options.prefix + absolute_file_path
              s3key = boto.s3.key.Key(bucket=s3bucket,name=s3key_name)
              file_size = os.path.getsize(absolute_file_path)
              if file_size > chunk_size:
                multi_part_upload(absolute_file_path,file_size)
              else:
                s3key.set_contents_from_filename(absolute_file_path)
              print 'Uploaded: %s' % (s3key.name)
            else:
              print '%s seems to be uploaded already.' % (absolute_file_path)

def multi_part_upload(file_path,file_size):
    mp = s3bucket.initiate_multipart_upload(file_path)
    chunk_count = int(math.ceil(file_size/float(chunk_size)))
    for i in range(chunk_count):
      offset = chunk_size * i
      bytes = min(chunk_size, file_size - offset)
      with FileChunkIO(file_path,'r',offset=offset,bytes=bytes) as fp:
        mp.upload_part_from_file(fp,part_num=i+1)
    mp.complete_upload()

os.chdir(options.directory)
root = os.getcwd()
targets = find_dirs(root)
for target in targets:
    upload_files(target)