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| 1 # Copyright 2012 the V8 project authors. All rights reserved. | |
| 2 # Redistribution and use in source and binary forms, with or without | |
| 3 # modification, are permitted provided that the following conditions are | |
| 4 # met: | |
| 5 # | |
| 6 # * Redistributions of source code must retain the above copyright | |
| 7 # notice, this list of conditions and the following disclaimer. | |
| 8 # * Redistributions in binary form must reproduce the above | |
| 9 # copyright notice, this list of conditions and the following | |
| 10 # disclaimer in the documentation and/or other materials provided | |
| 11 # with the distribution. | |
| 12 # * Neither the name of Google Inc. nor the names of its | |
| 13 # contributors may be used to endorse or promote products derived | |
| 14 # from this software without specific prior written permission. | |
| 15 # | |
| 16 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 17 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 18 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 19 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 20 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 21 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 22 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 23 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 24 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 25 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 26 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 27 | |
| 28 | |
| 29 import cStringIO as StringIO | |
| 30 try: | |
| 31 import ujson as json | |
| 32 except ImportError: | |
| 33 print("You should install UltraJSON, it is much faster!") | |
| 34 import json | |
| 35 import os | |
| 36 import struct | |
| 37 import zlib | |
| 38 | |
| 39 from . import constants | |
| 40 | |
| 41 def Send(obj, sock): | |
| 42 """ | |
| 43 Sends a JSON encodable object over the specified socket (zlib-compressed). | |
| 44 """ | |
| 45 obj = json.dumps(obj) | |
| 46 compression_level = 2 # 1 = fastest, 9 = best compression | |
| 47 compressed = zlib.compress(obj, compression_level) | |
| 48 payload = struct.pack('>i', len(compressed)) + compressed | |
| 49 sock.sendall(payload) | |
| 50 | |
| 51 | |
| 52 class Receiver(object): | |
| 53 def __init__(self, sock): | |
| 54 self.sock = sock | |
| 55 self.data = StringIO.StringIO() | |
| 56 self.datalength = 0 | |
| 57 self._next = self._GetNext() | |
| 58 | |
| 59 def IsDone(self): | |
| 60 return self._next == None | |
| 61 | |
| 62 def Current(self): | |
| 63 return self._next | |
| 64 | |
| 65 def Advance(self): | |
| 66 try: | |
| 67 self._next = self._GetNext() | |
| 68 except: | |
| 69 raise | |
| 70 | |
| 71 def _GetNext(self): | |
| 72 try: | |
| 73 while self.datalength < constants.SIZE_T: | |
| 74 try: | |
| 75 chunk = self.sock.recv(8192) | |
| 76 except: | |
| 77 raise | |
| 78 if not chunk: return None | |
| 79 self._AppendData(chunk) | |
| 80 size = self._PopData(constants.SIZE_T) | |
| 81 size = struct.unpack(">i", size)[0] | |
| 82 while self.datalength < size: | |
| 83 try: | |
| 84 chunk = self.sock.recv(8192) | |
| 85 except: | |
| 86 raise | |
| 87 if not chunk: return None | |
| 88 self._AppendData(chunk) | |
| 89 result = self._PopData(size) | |
| 90 result = zlib.decompress(result) | |
| 91 result = json.loads(result) | |
| 92 if result == constants.END_OF_STREAM: | |
| 93 return None | |
| 94 return result | |
| 95 except: | |
| 96 raise | |
| 97 | |
| 98 def _AppendData(self, new): | |
| 99 self.data.seek(0, os.SEEK_END) | |
| 100 self.data.write(new) | |
| 101 self.datalength += len(new) | |
| 102 | |
| 103 def _PopData(self, length): | |
| 104 self.data.seek(0) | |
| 105 chunk = self.data.read(length) | |
| 106 remaining = self.data.read() | |
| 107 self.data.close() | |
| 108 self.data = StringIO.StringIO() | |
| 109 self.data.write(remaining) | |
| 110 assert self.datalength - length == len(remaining) | |
| 111 self.datalength = len(remaining) | |
| 112 return chunk | |
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Chromium Code Reviews
Issue 11028027:
Revert trunk to bleeding_edge at r12484 (Closed)
Base URL: https://v8.googlecode.com/svn/trunk