/usr/lib/python2.7/dist-packages/pymongo/message.py is in python-pymongo 2.6.3-1build1.
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#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Tools for creating `messages
<http://www.mongodb.org/display/DOCS/Mongo+Wire+Protocol>`_ to be sent to
MongoDB.
.. note:: This module is for internal use and is generally not needed by
application developers.
.. versionadded:: 1.1.2
"""
import random
import struct
import bson
from bson.binary import OLD_UUID_SUBTYPE
from bson.py3compat import b
from bson.son import SON
try:
from pymongo import _cmessage
_use_c = True
except ImportError:
_use_c = False
from pymongo.errors import InvalidDocument, InvalidOperation, OperationFailure
__ZERO = b("\x00\x00\x00\x00")
EMPTY = b("")
MAX_INT32 = 2147483647
MIN_INT32 = -2147483648
def __last_error(namespace, args):
"""Data to send to do a lastError.
"""
cmd = SON([("getlasterror", 1)])
cmd.update(args)
splitns = namespace.split('.', 1)
return query(0, splitns[0] + '.$cmd', 0, -1, cmd)
def __pack_message(operation, data):
"""Takes message data and adds a message header based on the operation.
Returns the resultant message string.
"""
request_id = random.randint(MIN_INT32, MAX_INT32)
message = struct.pack("<i", 16 + len(data))
message += struct.pack("<i", request_id)
message += __ZERO # responseTo
message += struct.pack("<i", operation)
return (request_id, message + data)
def insert(collection_name, docs, check_keys,
safe, last_error_args, continue_on_error, uuid_subtype):
"""Get an **insert** message.
.. note:: As of PyMongo 2.6, this function is no longer used. It
is being kept (with tests) for backwards compatibility with 3rd
party libraries that may currently be using it, but will likely
be removed in a future release.
"""
options = 0
if continue_on_error:
options += 1
data = struct.pack("<i", options)
data += bson._make_c_string(collection_name)
encoded = [bson.BSON.encode(doc, check_keys, uuid_subtype) for doc in docs]
if not encoded:
raise InvalidOperation("cannot do an empty bulk insert")
max_bson_size = max(map(len, encoded))
data += EMPTY.join(encoded)
if safe:
(_, insert_message) = __pack_message(2002, data)
(request_id, error_message, _) = __last_error(collection_name,
last_error_args)
return (request_id, insert_message + error_message, max_bson_size)
else:
(request_id, insert_message) = __pack_message(2002, data)
return (request_id, insert_message, max_bson_size)
if _use_c:
insert = _cmessage._insert_message
def update(collection_name, upsert, multi,
spec, doc, safe, last_error_args, check_keys, uuid_subtype):
"""Get an **update** message.
"""
options = 0
if upsert:
options += 1
if multi:
options += 2
data = __ZERO
data += bson._make_c_string(collection_name)
data += struct.pack("<i", options)
data += bson.BSON.encode(spec, False, uuid_subtype)
encoded = bson.BSON.encode(doc, check_keys, uuid_subtype)
data += encoded
if safe:
(_, update_message) = __pack_message(2001, data)
(request_id, error_message, _) = __last_error(collection_name,
last_error_args)
return (request_id, update_message + error_message, len(encoded))
else:
(request_id, update_message) = __pack_message(2001, data)
return (request_id, update_message, len(encoded))
if _use_c:
update = _cmessage._update_message
def query(options, collection_name, num_to_skip,
num_to_return, query, field_selector=None,
uuid_subtype=OLD_UUID_SUBTYPE):
"""Get a **query** message.
"""
data = struct.pack("<I", options)
data += bson._make_c_string(collection_name)
data += struct.pack("<i", num_to_skip)
data += struct.pack("<i", num_to_return)
encoded = bson.BSON.encode(query, False, uuid_subtype)
data += encoded
max_bson_size = len(encoded)
if field_selector is not None:
encoded = bson.BSON.encode(field_selector, False, uuid_subtype)
data += encoded
max_bson_size = max(len(encoded), max_bson_size)
(request_id, query_message) = __pack_message(2004, data)
return (request_id, query_message, max_bson_size)
if _use_c:
query = _cmessage._query_message
def get_more(collection_name, num_to_return, cursor_id):
"""Get a **getMore** message.
"""
data = __ZERO
data += bson._make_c_string(collection_name)
data += struct.pack("<i", num_to_return)
data += struct.pack("<q", cursor_id)
return __pack_message(2005, data)
if _use_c:
get_more = _cmessage._get_more_message
def delete(collection_name, spec, safe, last_error_args, uuid_subtype):
"""Get a **delete** message.
"""
data = __ZERO
data += bson._make_c_string(collection_name)
data += __ZERO
encoded = bson.BSON.encode(spec, False, uuid_subtype)
data += encoded
if safe:
(_, remove_message) = __pack_message(2006, data)
(request_id, error_message, _) = __last_error(collection_name,
last_error_args)
return (request_id, remove_message + error_message, len(encoded))
else:
(request_id, remove_message) = __pack_message(2006, data)
return (request_id, remove_message, len(encoded))
def kill_cursors(cursor_ids):
"""Get a **killCursors** message.
"""
data = __ZERO
data += struct.pack("<i", len(cursor_ids))
for cursor_id in cursor_ids:
data += struct.pack("<q", cursor_id)
return __pack_message(2007, data)
def _do_batched_insert(collection_name, docs, check_keys,
safe, last_error_args, continue_on_error, uuid_subtype, client):
"""Insert `docs` using multiple batches.
"""
def _insert_message(insert_message, send_safe):
"""Build the insert message with header and GLE.
"""
request_id, final_message = __pack_message(2002, insert_message)
if send_safe:
request_id, error_message, _ = __last_error(collection_name,
last_error_args)
final_message += error_message
return request_id, final_message
if not docs:
raise InvalidOperation("cannot do an empty bulk insert")
last_error = None
begin = struct.pack("<i", int(continue_on_error))
begin += bson._make_c_string(collection_name)
message_length = len(begin)
data = [begin]
for doc in docs:
encoded = bson.BSON.encode(doc, check_keys, uuid_subtype)
encoded_length = len(encoded)
if encoded_length > client.max_bson_size:
raise InvalidDocument("BSON document too large (%d bytes)"
" - the connected server supports"
" BSON document sizes up to %d"
" bytes." %
(encoded_length, client.max_bson_size))
message_length += encoded_length
if message_length < client.max_message_size:
data.append(encoded)
continue
# We have enough data, send this message.
send_safe = safe or not continue_on_error
try:
client._send_message(_insert_message(EMPTY.join(data),
send_safe), send_safe)
# Exception type could be OperationFailure or a subtype
# (e.g. DuplicateKeyError)
except OperationFailure, exc:
# Like it says, continue on error...
if continue_on_error:
# Store exception details to re-raise after the final batch.
last_error = exc
# With unacknowledged writes just return at the first error.
elif not safe:
return
# With acknowledged writes raise immediately.
else:
raise
message_length = len(begin) + encoded_length
data = [begin, encoded]
client._send_message(_insert_message(EMPTY.join(data), safe), safe)
# Re-raise any exception stored due to continue_on_error
if last_error is not None:
raise last_error
if _use_c:
_do_batched_insert = _cmessage._do_batched_insert
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