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Amazon Glacier from Python. Based on Boto, will contribute to Boto when it's a little more finished if it's any good at that point :)
# Thomas Parslow http://almostobsolete.net
# Just a work in progress and adapted to what I need right now.
# It does uploads (via a file-like object that you write to) and
# I've started on downloads. Needs the development version of Boto from Github.
#
# Example:
#
# glacierconn = GlacierConnection(AWS_ACCESS_KEY, AWS_SECRET_ACCESS_KEY)
# writer = GlacierWriter(glacierconn, GLACIER_VAULT)
# writer.write(somedata)
# writer.write(someotherdata)
# writer.close()
# # Get the id of the newly created archive
# archive_id = writer.get_archive_id()
from boto.connection import AWSAuthConnection
import urllib
import hashlib
import math
import json
class GlacierConnection(AWSAuthConnection):
def __init__(self, aws_access_key_id=None, aws_secret_access_key=None, region="us-east-1",
is_secure=True, port=None, proxy=None, proxy_port=None,
proxy_user=None, proxy_pass=None,
host=None, debug=0, https_connection_factory=None,
path='/', provider='aws', security_token=None,
suppress_consec_slashes=True):
if host is None:
host = 'glacier.%s.amazonaws.com' % (region,)
AWSAuthConnection.__init__(self, host,
aws_access_key_id, aws_secret_access_key,
is_secure, port, proxy, proxy_port, proxy_user, proxy_pass,
debug=debug, https_connection_factory=https_connection_factory,
path=path, provider=provider, security_token=security_token,
suppress_consec_slashes=suppress_consec_slashes)
def _required_auth_capability(self):
return ["hmac-v4"]
def get_vault(self, name):
return GlacierVault(self, name)
class GlacierVault(object):
def __init__(self, connection, name):
self.connection = connection
self.name = name
def retrieve_archive(self, archive, sns_topic=None, description=None):
"""
Initiate a archive retrieval job to download the data from an
archive.
"""
params = {"Type": "archive-retrieval", "ArchiveId": archive}
if sns_topic is not None:
params["SNSTopic"] = sns_topic
if description is not None:
params["Description"] = description
job = GlacierJob(self, params)
job.initiate()
return job
def make_request(self, method, extra_path, headers, data):
return self.connection.make_request(method, "/-/vaults/%s%s" % (urllib.quote(self.name),extra_path,), headers, data)
class GlacierJob(object):
def __init__(self, vault, params):
self.vault = vault
self.params = params
def initiate(self):
headers = {
"x-amz-glacier-version": "2012-06-01",
}
response = self.vault.make_request("POST", "/jobs", headers, json.dumps(self.params))
assert response.status == 202, "Start job expected 202 back (got %s): %r" % (response.status, response.read())
def chunk_hashes(str):
"""
Break up the byte-string into 1MB chunks and return sha256 hashes
for each.
"""
chunk = 1024*1024
chunk_count = int(math.ceil(len(str)/float(chunk)))
chunks = [str[i*chunk:(i+1)*chunk] for i in range(chunk_count)]
return [hashlib.sha256(x).digest() for x in chunks]
def tree_hash(fo):
"""
Given a hash of each 1MB chunk (from chunk_hashes) this will hash
together adjacent hashes until it ends up with one big one. So a
tree of hashes.
"""
hashes = []
hashes.extend(fo)
while len(hashes) > 1:
new_hashes = []
while True:
if len(hashes) > 1:
first = hashes.pop(0)
second = hashes.pop(0)
new_hashes.append(hashlib.sha256(first + second).digest())
elif len(hashes) == 1:
only = hashes.pop(0)
new_hashes.append(only)
else:
break
hashes.extend(new_hashes)
return hashes[0]
def bytes_to_hex(str):
return ''.join( [ "%02x" % ord( x ) for x in str] ).strip()
class GlacierWriter(object):
"""
Presents a file-like object for writing to a Amazon Glacier
Archive. The data is written using the multi-part upload API.
"""
DEFAULT_PART_SIZE = 128*1024*1024 #128MB
def __init__(self, connection, vault, part_size=DEFAULT_PART_SIZE):
self.part_size = part_size
self.buffer_size = 0
self.uploaded_size = 0
self.buffer = []
self.vault = vault
self.tree_hashes = []
self.archive_location = None
self.closed = False
self.connection = connection
headers = {
"x-amz-glacier-version": "2012-06-01",
"x-amz-part-size": str(self.part_size)
}
response = self.connection.make_request(
"POST",
"/-/vaults/%s/multipart-uploads" % (urllib.quote(self.vault),),
headers,
"")
assert response.status == 201, "Multipart-start should respond with a 201! (got %s): %r" % (response.status, response.read())
response.read()
self.upload_url = response.getheader("location")
def send_part(self):
buf = "".join(self.buffer)
# Put back any data remaining over the part size into the
# buffer
if len(buf) < self.part_size:
self.buffer = [buf[self.part_size:]]
self.buffer_size = len(self.buffer[0])
else:
self.buffer = []
self.buffer_size = 0
# The part we will send
part = buf[:self.part_size]
# Create a request and sign it
part_tree_hash = tree_hash(chunk_hashes(part))
self.tree_hashes.append(part_tree_hash)
headers = {
"x-amz-glacier-version": "2012-06-01",
"Content-Range": "bytes %d-%d/*" % (self.uploaded_size, (self.uploaded_size+len(part))-1),
"Content-Length": str(len(part)),
"Content-Type": "application/octet-stream",
"x-amz-sha256-tree-hash": bytes_to_hex(part_tree_hash),
"x-amz-content-sha256": hashlib.sha256(part).hexdigest()
}
response = self.connection.make_request(
"PUT",
self.upload_url,
headers,
part)
assert response.status == 204, "Multipart upload part should respond with a 204! (got %s): %r" % (response.status, response.read())
response.read()
self.uploaded_size += len(part)
def write(self, str):
assert not self.closed, "Tried to write to a GlacierWriter that is already closed!"
self.buffer.append(str)
self.buffer_size += len(str)
while self.buffer_size > self.part_size:
self.send_part()
def close(self):
if self.closed:
return
if self.buffer_size > 0:
self.send_part()
# Complete the multiplart glacier upload
headers = {
"x-amz-glacier-version": "2012-06-01",
"x-amz-sha256-tree-hash": bytes_to_hex(tree_hash(self.tree_hashes)),
"x-amz-archive-size": str(self.uploaded_size)
}
response = self.connection.make_request(
"POST",
self.upload_url,
headers,
"")
assert response.status == 201, "Multipart-complete should respond with a 201! (got %s): %r" % (response.status, response.read())
response.read()
self.archive_id = response.getheader("x-amz-archive-id")
self.closed = True
def get_archive_id(self):
self.close()
return self.archive_id
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