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- """
- kombu.compression
- =================
-
- Compression utilities.
-
- """
- from __future__ import absolute_import
-
- from kombu.utils.encoding import ensure_bytes
-
- import zlib
-
- _aliases = {}
- _encoders = {}
- _decoders = {}
-
- __all__ = ['register', 'encoders', 'get_encoder',
- 'get_decoder', 'compress', 'decompress']
-
-
- def register(encoder, decoder, content_type, aliases=[]):
- """Register new compression method.
-
- :param encoder: Function used to compress text.
- :param decoder: Function used to decompress previously compressed text.
- :param content_type: The mime type this compression method identifies as.
- :param aliases: A list of names to associate with this compression method.
-
- """
- _encoders[content_type] = encoder
- _decoders[content_type] = decoder
- _aliases.update((alias, content_type) for alias in aliases)
-
-
- def encoders():
- """Return a list of available compression methods."""
- return list(_encoders)
-
-
- def get_encoder(t):
- """Get encoder by alias name."""
- t = _aliases.get(t, t)
- return _encoders[t], t
-
-
- def get_decoder(t):
- """Get decoder by alias name."""
- return _decoders[_aliases.get(t, t)]
-
-
- def compress(body, content_type):
- """Compress text.
-
- :param body: The text to compress.
- :param content_type: mime-type of compression method to use.
-
- """
- encoder, content_type = get_encoder(content_type)
- return encoder(ensure_bytes(body)), content_type
-
-
- def decompress(body, content_type):
- """Decompress compressed text.
-
- :param body: Previously compressed text to uncompress.
- :param content_type: mime-type of compression method used.
-
- """
- return get_decoder(content_type)(body)
-
-
- register(zlib.compress,
- zlib.decompress,
- 'application/x-gzip', aliases=['gzip', 'zlib'])
- try:
- import bz2
- except ImportError:
- pass # Jython?
- else:
- register(bz2.compress,
- bz2.decompress,
- 'application/x-bz2', aliases=['bzip2', 'bzip'])
|
