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# frozen_string_literal: true
# rubocop:todo all
# Copyright (C) 2014-2020 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
class Server
class Description
# Defines behavior around what features a specific server supports.
#
# @since 2.0.0
class Features
# List of features and the wire protocol version they appear in.
#
# Wire protocol versions map to server releases as follows:
# - 2 => 2.6
# - 3 => 3.0
# - 4 => 3.2
# - 5 => 3.4
# - 6 => 3.6
# - 7 => 4.0
# - 8 => 4.2
# - 9 => 4.4
# - 13 => 5.0
# - 14 => 5.1
# - 17 => 6.0
#
# @since 2.0.0
MAPPINGS = {
merge_out_on_secondary: 13,
get_more_comment: 9,
retryable_write_error_label: 9,
commit_quorum: 9,
# Server versions older than 4.2 do not reliably validate options
# provided by the client during findAndModify operations, requiring the
# driver to raise client-side errors when those options are provided.
find_and_modify_option_validation: 8,
sharded_transactions: 8,
transactions: 7,
scram_sha_256: 7,
array_filters: 6,
op_msg: 6,
sessions: 6,
collation: 5,
max_staleness: 5,
# Server versions older than 3.4 do not reliably validate options
# provided by the client during update/delete operations, requiring the
# driver to raise client-side errors when those options are provided.
update_delete_option_validation: 5,
find_command: 4,
list_collections: 3,
list_indexes: 3,
scram_sha_1: 3,
write_command: 2,
users_info: 2,
}.freeze
# Error message if the server is too old for this version of the driver.
#
# @since 2.5.0
SERVER_TOO_OLD = "Server at (%s) reports wire version (%s), but this version of the Ruby driver " +
"requires at least (%s)."
# Error message if the driver is too old for the version of the server.
#
# @since 2.5.0
DRIVER_TOO_OLD = "Server at (%s) requires wire version (%s), but this version of the Ruby driver " +
"only supports up to (%s)."
# The wire protocol versions that this version of the driver supports.
#
# @since 2.0.0
DRIVER_WIRE_VERSIONS = (6..25).freeze
# Create the methods for each mapping to tell if they are supported.
#
# @since 2.0.0
MAPPINGS.each do |name, version|
# Determine whether or not the feature is supported.
#
# @example Is a feature enabled?
# features.list_collections_enabled?
#
# @return [ true, false ] Whether the feature is supported.
#
# @since 2.0.0
define_method("#{name}_enabled?") do
server_wire_versions.include?(MAPPINGS[name])
end
end
# @return [ Range ] server_wire_versions The server's supported wire
# versions.
attr_reader :server_wire_versions
# Initialize the features.
#
# @example Initialize the features.
# Features.new(0..3)
#
# @param [ Range ] server_wire_versions The server supported wire
# versions.
#
# @since 2.0.0
def initialize(server_wire_versions, address = nil)
if server_wire_versions.min.nil?
raise ArgumentError, "server_wire_versions's min is nil"
end
if server_wire_versions.max.nil?
raise ArgumentError, "server_wire_versions's max is nil"
end
@server_wire_versions = server_wire_versions
@address = address
if Mongo::Lint.enabled?
freeze
end
end
# Check that there is an overlap between the driver supported wire
# version range and the server wire version range.
#
# @example Verify the wire version overlap.
# features.check_driver_support!
#
# @raise [ Error::UnsupportedFeatures ] If the wire version range is
# not covered by the driver.
#
# @since 2.5.1
def check_driver_support!
if DRIVER_WIRE_VERSIONS.min > @server_wire_versions.max
raise Error::UnsupportedFeatures.new(SERVER_TOO_OLD % [@address,
@server_wire_versions.max,
DRIVER_WIRE_VERSIONS.min])
elsif DRIVER_WIRE_VERSIONS.max < @server_wire_versions.min
raise Error::UnsupportedFeatures.new(DRIVER_TOO_OLD % [@address,
@server_wire_versions.min,
DRIVER_WIRE_VERSIONS.max])
end
end
end
end
end
end
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