mirror of
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98 lines
3.9 KiB
Python
98 lines
3.9 KiB
Python
#!/usr/bin/python -OOOO
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# vim: set fileencoding=utf8 shiftwidth=4 tabstop=4 textwidth=80 foldmethod=marker :
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# Copyright (c) 2010, Kou Man Tong. All rights reserved.
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# For licensing, see LICENSE file included in the package.
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"""
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BSON serialization and deserialization logic.
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Specifications taken from: http://bsonspec.org/#/specification
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The following types are unsupported, because for data exchange purposes, they're
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over-engineered:
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0x06 (Undefined)
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0x07 (ObjectId)
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0x0b (Regex - Exactly which flavor do you want? Better let higher level
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programmers make that decision.)
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0x0c (DBPointer)
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0x0d (JavaScript code)
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0x0e (Symbol)
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0x0f (JS w/ scope)
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0x11 (MongoDB-specific timestamp)
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For binaries, only the default 0x0 type is supported.
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>>> a = {
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... u"Item A" : u"String item A",
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... u"Item D" : {u"ROFLOL" : u"Blah blah blah"},
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... u"Item C" : [1, 123456789012345, None, "Party and Bad Romance"],
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... u"Item B" : u"\u4e00\u9580\u4e94\u5091"
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... }
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>>> def sorted(obj, dfs_stack):
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... keys = obj.keys()
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... keys.sort()
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... for i in keys: yield i
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...
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>>> def reverse(obj, dfs_stack):
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... keys = obj.keys()
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... keys.sort(reverse = True)
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... for i in keys: yield i
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...
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>>> serialized = dumps(a, sorted)
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>>> serialized
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'\\x9f\\x00\\x00\\x00\\x02Item A\\x00\\x0e\\x00\\x00\\x00String item A\\x00\\x02Item B\\x00\\r\\x00\\x00\\x00\\xe4\\xb8\\x80\\xe9\\x96\\x80\\xe4\\xba\\x94\\xe5\\x82\\x91\\x00\\x04Item C\\x007\\x00\\x00\\x00\\x100\\x00\\x01\\x00\\x00\\x00\\x121\\x00y\\xdf\\r\\x86Hp\\x00\\x00\\n2\\x00\\x053\\x00\\x15\\x00\\x00\\x00\\x00Party and Bad Romance\\x00\\x03Item D\\x00 \\x00\\x00\\x00\\x02ROFLOL\\x00\\x0f\\x00\\x00\\x00Blah blah blah\\x00\\x00\\x00'
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>>>
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>>> b = loads(serialized)
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>>> b
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{u'Item C': [1, 123456789012345, None, 'Party and Bad Romance'], u'Item B': u'\\u4e00\\u9580\\u4e94\\u5091', u'Item A': u'String item A', u'Item D': {u'ROFLOL': u'Blah blah blah'}}
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>>> reverse_serialized = dumps(a, reverse)
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>>> reverse_serialized
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'\\x9f\\x00\\x00\\x00\\x03Item D\\x00 \\x00\\x00\\x00\\x02ROFLOL\\x00\\x0f\\x00\\x00\\x00Blah blah blah\\x00\\x00\\x04Item C\\x007\\x00\\x00\\x00\\x100\\x00\\x01\\x00\\x00\\x00\\x121\\x00y\\xdf\\r\\x86Hp\\x00\\x00\\n2\\x00\\x053\\x00\\x15\\x00\\x00\\x00\\x00Party and Bad Romance\\x00\\x02Item B\\x00\\r\\x00\\x00\\x00\\xe4\\xb8\\x80\\xe9\\x96\\x80\\xe4\\xba\\x94\\xe5\\x82\\x91\\x00\\x02Item A\\x00\\x0e\\x00\\x00\\x00String item A\\x00\\x00'
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>>> c = loads(reverse_serialized)
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>>> c
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{u'Item C': [1, 123456789012345, None, 'Party and Bad Romance'], u'Item B': u'\\u4e00\\u9580\\u4e94\\u5091', u'Item A': u'String item A', u'Item D': {u'ROFLOL': u'Blah blah blah'}}
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"""
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from codec import *
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import network
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__all__ = ["loads", "dumps"]
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# {{{ Serialization and Deserialization
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def dumps(obj, generator = None):
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"""
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Given a dict, outputs a BSON string.
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generator is an optional function which accepts the dictionary/array being
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encoded, the current DFS traversal stack, and outputs an iterator indicating
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the correct encoding order for keys.
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"""
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if isinstance(obj, BSONCoding):
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return encode_object(obj, [], generator_func = generator)
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return encode_document(obj, [], generator_func = generator)
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def loads(data):
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"""
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Given a BSON string, outputs a dict.
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"""
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return decode_document(data, 0)[1]
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# }}}
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# {{{ Socket Patchers
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def patch_socket():
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"""
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Patches the Python socket class such that sockets can send and receive BSON
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objects atomically.
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This adds the following functions to socket:
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recvbytes(bytes_needed, sock_buf = None) - reads bytes_needed bytes
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atomically. Returns None if socket closed.
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recvobj() - reads a BSON document from the socket atomically and returns
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the deserialized dictionary. Returns None if socket closed.
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sendobj(obj) - sends a BSON document to the socket atomically.
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"""
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from socket import socket
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socket.recvbytes = network._recvbytes
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socket.recvobj = network._recvobj
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socket.sendobj = network._sendobj
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# }}}
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