Synnefo

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import os

import types

import json

from hashmap import HashMap

from binascii import hexlify, unhexlify

from cStringIO import StringIO

from client import Fault

from progress.bar import IncrementalBar

def upload(client, path, container, prefix, name=None, mimetype=None):

    meta = client.retrieve_container_metadata(container)

    blocksize = int(meta['x-container-block-size'])

    blockhash = meta['x-container-block-hash']

    size = os.path.getsize(path)

    hashes = HashMap(blocksize, blockhash)

    hashes.load(open(path))

    map = {'bytes': size, 'hashes': [hexlify(x) for x in hashes]}

    objectname = name if name else os.path.split(path)[-1]

    object = prefix + objectname

    kwargs = {'mimetype': mimetype} if mimetype else {}

    v = None

    try:

        v = client.create_object_by_hashmap(container, object, map, **kwargs)

    except Fault, fault:

        if fault.status != 409:

            raise

    else:

        return v

    if isinstance(fault.data, types.StringType):

        missing = json.loads(fault.data)

    elif isinstance(fault.data, types.ListType):

        missing = fault.data

    if '' in missing:

        del missing[missing.index(''):]

    bar = IncrementalBar('Uploading', max=len(missing))

    bar.suffix = '%(percent).1f%% - %(eta)ds'

    with open(path) as fp:

        for hash in missing:

            offset = hashes.index(unhexlify(hash)) * blocksize

            fp.seek(offset)

            block = fp.read(blocksize)

            client.update_container_data(container, StringIO(block))

            bar.next()

    bar.finish()

    return client.create_object_by_hashmap(container, object, map, **kwargs)

def download(client, container, object, path):

    res = client.retrieve_object_hashmap(container, object)

    blocksize = int(res['block_size'])

    blockhash = res['block_hash']

    bytes = res['bytes']

    map = res['hashes']

    if os.path.exists(path):

        h = HashMap(blocksize, blockhash)

        h.load(open(path))

        hashes = [hexlify(x) for x in h]

    else:

        open(path, 'w').close()     # Create an empty file

        hashes = []

    with open(path, 'a+') as fp:

        if bytes != 0:

            for i, h in enumerate(map):

                if i < len(hashes) and h == hashes[i]:

                    continue

                start = i * blocksize

                end = '' if i == len(map) - 1 else ((i + 1) * blocksize) - 1

                data = client.retrieve_object(

                    container, object, range='bytes=%s-%s' % (start, end))

                if i != len(map) - 1:

                    data += (blocksize - len(data)) * '\x00'

                fp.seek(start)

                fp.write(data)

        fp.truncate(bytes)