Synnefo » ./kamaki

# Copyright 2013 GRNET S.A. All rights reserved.

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

def _matches(val1, val2, exactMath=True):

    """Case Insensitive match"""

    return (val1.lower() == val2.lower()) if (

        exactMath) else val1.lower().startswith(val2.lower())

def filter_out(d, prefix, exactMatch=False):

    """Remove entries that are prefixed with prefix (case insensitive)

    :param d: (dict) input

    :param prefix: (str) prefix to match input keys against

    :param exactMatch: (bool) key should fully match if True, just prefixed

        with prefix if False

    :returns: (dict) the updated d

    """

    ret = dict()

    for key, val in d.items():

        if not _matches(key, prefix, exactMath=exactMatch):

            ret[key] = val

    return ret

def filter_in(d, prefix, exactMatch=False):

    """Keep only entries of d prefixed with prefix

    :param d: (dict) input

    :param prefix: (str) prefix to match input keys against

    :param exactMatch: (bool) key should fully match if True, just prefixed

        with prefix if False

    :returns: (dict) the updated d

    """

    ret = dict()

    for key, val in d.items():

        if _matches(key, prefix, exactMath=exactMatch):

            ret[key] = val

    return ret

def path4url(*args):

    """

    :param args: (list of str)

    :returns: (str) a path in the form /args[0]/args[1]/...

    """

    r = '/'.join([''] + [arg.decode('utf-8') if (

        isinstance(arg, str)) else '%s' % arg for arg in args])

    while '//' in r:

        r = r.replace('//', '/')

    return ('/%s' % r.strip('/')) if r else ''

def readall(openfile, size, retries=7):

    """Read a file until size is reached"""

    remains = size if size > 0 else 0

    buf = ''

    for i in range(retries):

        buf += openfile.read(remains)

        remains = size - len(buf)

        if remains:

            continue

        return buf

    raise IOError('Failed to read %s bytes from file' % size)