Synnefo » ./kamaki

# Copyright 2011 GRNET S.A. All rights reserved.

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import hashlib

import json

from . import ClientError

from .storage import StorageClient

class PithosClient(StorageClient):

    """GRNet Pithos API client"""

    def put_block(self, data):

        path = '/%s/%s?update' % (self.account, self.container)

        headers = {'Content-Type': 'application/octet-stream'}

        self.raw_http_cmd('POST', path, data, headers, success=202)

    def create_object(self, object, f):

        meta = self.get_container_meta()

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

        blockhash = meta['block-hash']

        size = 0

        hashes = []

        data = f.read(blocksize)

        while data:

            size += len(data)

            h = hashlib.new(blockhash)

            h.update(data)

            hashes.append(h.hexdigest())

            data = f.read(blocksize)

        path = '/%s/%s/%s?hashmap&format=json' % (self.account, self.container,

                object)

        hashmap = dict(bytes=size, hashes=hashes)

        req = json.dumps(hashmap)

        resp, reply = self.raw_http_cmd('PUT', path, req, success=None)

        if resp.status not in (201, 409):

            raise ClientError('Invalid response from the server')

        if resp.status == 201:

            return

        hashes = set(json.loads(reply))

        f.seek(0)

        data = f.read(blocksize)

        while data:

            h = hashlib.new(blockhash)

            h.update(data)

            hash = h.hexdigest()

            if hash in hashes:

                self.put_block(data)

                hashes.remove(hash)

            data = f.read(blocksize)

        self.http_put(path, req, success=201)