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112 lines
3.5 KiB
112 lines
3.5 KiB
# Copyright 2012 the V8 project authors. All rights reserved.
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials provided
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# with the distribution.
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# * Neither the name of Google Inc. nor the names of its
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# contributors may be used to endorse or promote products derived
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# from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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import cStringIO as StringIO
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try:
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import ujson as json
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except ImportError:
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print("You should install UltraJSON, it is much faster!")
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import json
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import os
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import struct
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import zlib
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from . import constants
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def Send(obj, sock):
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"""
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Sends a JSON encodable object over the specified socket (zlib-compressed).
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"""
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obj = json.dumps(obj)
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compression_level = 2 # 1 = fastest, 9 = best compression
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compressed = zlib.compress(obj, compression_level)
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payload = struct.pack('>i', len(compressed)) + compressed
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sock.sendall(payload)
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class Receiver(object):
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def __init__(self, sock):
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self.sock = sock
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self.data = StringIO.StringIO()
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self.datalength = 0
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self._next = self._GetNext()
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def IsDone(self):
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return self._next == None
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def Current(self):
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return self._next
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def Advance(self):
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try:
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self._next = self._GetNext()
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except:
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raise
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def _GetNext(self):
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try:
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while self.datalength < constants.SIZE_T:
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try:
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chunk = self.sock.recv(8192)
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except:
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raise
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if not chunk: return None
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self._AppendData(chunk)
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size = self._PopData(constants.SIZE_T)
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size = struct.unpack(">i", size)[0]
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while self.datalength < size:
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try:
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chunk = self.sock.recv(8192)
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except:
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raise
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if not chunk: return None
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self._AppendData(chunk)
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result = self._PopData(size)
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result = zlib.decompress(result)
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result = json.loads(result)
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if result == constants.END_OF_STREAM:
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return None
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return result
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except:
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raise
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def _AppendData(self, new):
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self.data.seek(0, os.SEEK_END)
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self.data.write(new)
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self.datalength += len(new)
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def _PopData(self, length):
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self.data.seek(0)
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chunk = self.data.read(length)
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remaining = self.data.read()
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self.data.close()
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self.data = StringIO.StringIO()
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self.data.write(remaining)
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assert self.datalength - length == len(remaining)
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self.datalength = len(remaining)
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return chunk
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