| # Copyright 2012 the V8 project authors. All rights reserved. |
| # Redistribution and use in source and binary forms, with or without |
| # modification, are permitted provided that the following conditions are |
| # met: |
| # |
| # * Redistributions of source code must retain the above copyright |
| # notice, this list of conditions and the following disclaimer. |
| # * 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. |
| # * Neither the name of Google Inc. nor the names of its |
| # contributors may be used to endorse or promote products derived |
| # from this software without specific prior written permission. |
| # |
| # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| # "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 THE COPYRIGHT |
| # OWNER 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. |
| |
| |
| import cStringIO as StringIO |
| try: |
| import ujson as json |
| except ImportError: |
| import json |
| import os |
| import struct |
| import zlib |
| |
| from . import constants |
| |
| def Send(obj, sock): |
| """ |
| Sends a JSON encodable object over the specified socket (zlib-compressed). |
| """ |
| obj = json.dumps(obj) |
| compression_level = 2 # 1 = fastest, 9 = best compression |
| compressed = zlib.compress(obj, compression_level) |
| payload = struct.pack('>i', len(compressed)) + compressed |
| sock.sendall(payload) |
| |
| |
| class Receiver(object): |
| def __init__(self, sock): |
| self.sock = sock |
| self.data = StringIO.StringIO() |
| self.datalength = 0 |
| self._next = self._GetNext() |
| |
| def IsDone(self): |
| return self._next == None |
| |
| def Current(self): |
| return self._next |
| |
| def Advance(self): |
| try: |
| self._next = self._GetNext() |
| except: |
| raise |
| |
| def _GetNext(self): |
| try: |
| while self.datalength < constants.SIZE_T: |
| try: |
| chunk = self.sock.recv(8192) |
| except: |
| raise |
| if not chunk: return None |
| self._AppendData(chunk) |
| size = self._PopData(constants.SIZE_T) |
| size = struct.unpack(">i", size)[0] |
| while self.datalength < size: |
| try: |
| chunk = self.sock.recv(8192) |
| except: |
| raise |
| if not chunk: return None |
| self._AppendData(chunk) |
| result = self._PopData(size) |
| result = zlib.decompress(result) |
| result = json.loads(result) |
| if result == constants.END_OF_STREAM: |
| return None |
| return result |
| except: |
| raise |
| |
| def _AppendData(self, new): |
| self.data.seek(0, os.SEEK_END) |
| self.data.write(new) |
| self.datalength += len(new) |
| |
| def _PopData(self, length): |
| self.data.seek(0) |
| chunk = self.data.read(length) |
| remaining = self.data.read() |
| self.data.close() |
| self.data = StringIO.StringIO() |
| self.data.write(remaining) |
| assert self.datalength - length == len(remaining) |
| self.datalength = len(remaining) |
| return chunk |