def _unpack_response(response, cursor_id=None, as_class=dict,
tz_aware=False, uuid_subtype=OLD_UUID_SUBTYPE,
compile_re=True):
"""Unpack a response from the database.
Check the response for errors and unpack, returning a dictionary
containing the response data.
:Parameters:
- `response`: byte string as returned from the database
- `cursor_id` (optional): cursor_id we sent to get this response -
used for raising an informative exception when we get cursor id not
valid at server response
- `as_class` (optional): class to use for resulting documents
"""
response_flag = struct.unpack("<i", response[:4])[0]
if response_flag & 1:
# Shouldn't get this response if we aren't doing a getMore
assert cursor_id is not None
raise CursorNotFound("cursor id '%s' not valid at server" %
cursor_id)
elif response_flag & 2:
error_object = bson.BSON(response[20:]).decode()
if error_object["$err"].startswith("not master"):
raise AutoReconnect(error_object["$err"])
elif error_object.get("code") == 50:
raise ExecutionTimeout(error_object.get("$err"),
error_object.get("code"),
error_object)
raise OperationFailure("database error: %s" %
error_object.get("$err"),
error_object.get("code"),
error_object)
result = {}
result["cursor_id"] = struct.unpack("<q", response[4:12])[0]
result["starting_from"] = struct.unpack("<i", response[12:16])[0]
result["number_returned"] = struct.unpack("<i", response[16:20])[0]
result["data"] = bson.decode_all(response[20:],
as_class, tz_aware, uuid_subtype,
compile_re)
assert len(result["data"]) == result["number_returned"]
return result
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