lib/mongo/operation/find/op_msg.rb
# frozen_string_literal: true
# rubocop:todo all
# Copyright (C) 2018-2020 MongoDB Inc.
#
# 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.
module Mongo
module Operation
class Find
# A MongoDB find operation sent as an op message.
#
# @api private
#
# @since 2.5.2
class OpMsg < OpMsgBase
include CausalConsistencySupported
include ExecutableTransactionLabel
include PolymorphicResult
private
# Applies the relevant CSOT timeouts for a find command.
# Considers the cursor type and timeout mode and will add (or omit) a
# maxTimeMS field accordingly.
def apply_relevant_timeouts_to(spec, connection)
with_max_time(connection) do |max_time_sec|
timeout_ms = max_time_sec ? (max_time_sec * 1_000).to_i : nil
apply_find_timeouts_to(spec, timeout_ms) unless connection.description.mongocryptd?
end
end
def apply_find_timeouts_to(spec, timeout_ms)
view = context&.view
return spec unless view
case view.cursor_type
when nil # non-tailable
if view.timeout_mode == :cursor_lifetime
spec[:maxTimeMS] = timeout_ms || view.options[:max_time_ms]
else # timeout_mode == :iterable
# drivers MUST honor the timeoutMS option for the initial command
# but MUST NOT append a maxTimeMS field to the command sent to the
# server
if !timeout_ms && view.options[:max_time_ms]
spec[:maxTimeMS] = view.options[:max_time_ms]
end
end
when :tailable
# If timeoutMS is set, drivers...MUST NOT append a maxTimeMS field to any commands.
if !timeout_ms && view.options[:max_time_ms]
spec[:maxTimeMS] = view.options[:max_time_ms]
end
when :tailable_await
# The server supports the maxTimeMS option for the original command.
if timeout_ms || view.options[:max_time_ms]
spec[:maxTimeMS] = timeout_ms || view.options[:max_time_ms]
end
end
spec.tap do |spc|
spc.delete(:maxTimeMS) if spc[:maxTimeMS].nil?
end
end
def selector(connection)
# The mappings are BSON::Documents and as such store keys as
# strings, the spec here has symbol keys.
spec = BSON::Document.new(self.spec)
{
find: coll_name,
Protocol::Msg::DATABASE_IDENTIFIER => db_name,
}.update(Find::Builder::Command.selector(spec, connection))
end
end
end
end
end