975d6e2170
Review URL: https://codereview.chromium.org/10919265 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12583 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
113 lines
3.5 KiB
Python
113 lines
3.5 KiB
Python
# 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:
|
|
print("You should install UltraJSON, it is much faster!")
|
|
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
|