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# Copyright (C) 2017 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
# A command that uses OP_MSG, with the document as payload type 0.
#
# @since 2.5.0
module UsesCommandOpMsg
private
ZERO_TIMESTAMP = BSON::Timestamp.new(0,0)
READ_PREFERENCE = '$readPreference'.freeze
def apply_causal_consistency!(selector, server); end
def apply_cluster_time!(selector, server)
if !server.standalone?
cluster_time = [ server.cluster_time, (session && session.cluster_time) ].max_by do |doc|
(doc && doc[Cluster::CLUSTER_TIME]) || ZERO_TIMESTAMP
end
if cluster_time && (cluster_time[Cluster::CLUSTER_TIME] > ZERO_TIMESTAMP)
selector[CLUSTER_TIME] = cluster_time
end
end
end
def apply_session_id!(selector)
session.add_id!(selector) if session && !unacknowledged_write?
end
def unacknowledged_write?
write_concern && write_concern.get_last_error.nil?
end
def update_selector_for_session!(selector, server)
# the driver MUST ignore any implicit session if at the point it is sending a command
# to a specific server it turns out that that particular server doesn't support sessions after all
if server.features.sessions_enabled?
apply_cluster_time!(selector, server)
selector[:txnNumber] = BSON::Int64.new(txn_num) if txn_num
if session
apply_session_id!(selector)
apply_causal_consistency!(selector, server)
end
elsif session && !session.implicit?
apply_cluster_time!(selector, server)
apply_session_id!(selector)
apply_causal_consistency!(selector, server)
selector[:txnNumber] = BSON::Int64.new(txn_num) if txn_num
end
end
def command_op_msg(server, selector, options)
update_selector_for_session!(selector, server)
selector[Protocol::Msg::DATABASE_IDENTIFIER] = db_name
selector[READ_PREFERENCE] = read.to_doc if read
flags = unacknowledged_write? ? [:more_to_come] : [:none]
Protocol::Msg.new(flags, options, selector)
end
end
end
end
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