mirror of
https://github.com/samuelclay/NewsBlur.git
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85 lines
No EOL
3.1 KiB
Python
85 lines
No EOL
3.1 KiB
Python
from django.core.exceptions import MiddlewareNotUsed
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from django.conf import settings
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from django.db import connection
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from pymongo.connection import Connection
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from time import time
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import struct
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import bson
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from bson.errors import InvalidBSON
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class SqldumpMiddleware(object):
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def __init__(self):
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if not settings.DEBUG:
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raise MiddlewareNotUsed()
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def process_view(self, request, callback, callback_args, callback_kwargs):
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self._used_msg_ids = []
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if settings.DEBUG:
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# save old methods
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self.orig_send_message = \
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Connection._send_message
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self.orig_send_message_with_response = \
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Connection._send_message_with_response
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# instrument methods to record messages
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Connection._send_message = \
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self._instrument(Connection._send_message)
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Connection._send_message_with_response = \
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self._instrument(Connection._send_message_with_response)
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return None
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def process_response(self, request, response):
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if settings.DEBUG and hasattr(self, 'orig_send_message') and hasattr(self, 'orig_send_message_with_response'):
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# remove instrumentation from pymongo
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Connection._send_message = \
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self.orig_send_message
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Connection._send_message_with_response = \
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self.orig_send_message_with_response
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return response
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def _instrument(self, original_method):
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def instrumented_method(*args, **kwargs):
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message = _mongodb_decode_wire_protocol(args[1][1])
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if not message or message['msg_id'] in self._used_msg_ids:
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return original_method(*args, **kwargs)
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self._used_msg_ids.append(message['msg_id'])
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start = time()
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result = original_method(*args, **kwargs)
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stop = time()
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duration = stop - start
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connection.queries.append({
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'mongo': message,
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'time': '%.3f' % duration,
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})
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return result
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return instrumented_method
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def _mongodb_decode_wire_protocol(message):
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""" http://www.mongodb.org/display/DOCS/Mongo+Wire+Protocol """
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MONGO_OPS = {
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2001: 'msg',
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2002: 'insert',
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2003: 'reserved',
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2004: 'query',
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2005: 'get_more',
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2006: 'delete',
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2007: 'kill_cursors',
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}
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_, msg_id, _, opcode, _ = struct.unpack('<iiiii', message[:20])
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op = MONGO_OPS.get(opcode, 'unknown')
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zidx = 20
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collection_name_size = message[zidx:].find('\0')
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collection_name = message[zidx:zidx+collection_name_size]
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if '.system.' in collection_name:
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return
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zidx += collection_name_size + 1
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skip, limit = struct.unpack('<ii', message[zidx:zidx+8])
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zidx += 8
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msg = ""
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try:
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if message[zidx:]:
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msg = bson.decode_all(message[zidx:])
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except Exception, e:
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msg = 'invalid bson'
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return { 'op': op, 'collection': collection_name,
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'msg_id': msg_id, 'skip': skip, 'limit': limit,
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'query': msg } |