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# Copyright (C) 2016 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.
require 'rbconfig'
module Mongo
class Cluster
# Application metadata that is sent to the server in an ismaster command,
# when a new connection is established.
#
# @api private
#
# @since 2.4.0
class AppMetadata
extend Forwardable
# The max application metadata document byte size.
#
# @since 2.4.0
MAX_DOCUMENT_SIZE = 512.freeze
# The max application name byte size.
#
# @ since 2.4.0
MAX_APP_NAME_SIZE = 128.freeze
# The driver name.
#
# @ since 2.4.0
DRIVER_NAME = 'mongo-ruby-driver'
# Instantiate the new AppMetadata object.
#
# @api private
#
# @example Instantiate the app metadata.
# Mongo::Cluster.AppMetadata.new(cluster)
#
# @param [ Mongo::Cluster ] cluster The cluster.
#
# @since 2.4.0
def initialize(cluster)
@app_name = cluster.options[:app_name]
@platform = cluster.options[:platform]
@compressors = cluster.options[:compressors] || []
end
# Get the bytes of the ismaster message including this metadata.
#
# @api private
#
# @example Get the ismaster message bytes.
# metadata.ismaster_bytes
#
# @return [ String ] The raw bytes.
#
# @since 2.4.0
def ismaster_bytes
@ismaster_bytes ||= validate! && serialize.to_s
end
private
def validate!
if @app_name && @app_name.bytesize > MAX_APP_NAME_SIZE
raise Error::InvalidApplicationName.new(@app_name, MAX_APP_NAME_SIZE)
end
true
end
def full_client_document
BSON::Document.new.tap do |doc|
doc[:application] = { name: @app_name } if @app_name
doc[:driver] = driver_doc
doc[:os] = os_doc
doc[:platform] = platform
end
end
def serialize
Protocol::Query.new(Database::ADMIN, Database::COMMAND, document, :limit => -1).serialize
end
def document
client_document = full_client_document
while client_document.to_bson.to_s.size > MAX_DOCUMENT_SIZE do
if client_document[:os][:name] || client_document[:os][:architecture]
client_document[:os].delete(:name)
client_document[:os].delete(:architecture)
elsif client_document[:platform]
client_document.delete(:platform)
else
client_document = nil
end
end
document = Server::Monitor::Connection::ISMASTER
document = document.merge(compression: @compressors)
document[:client] = client_document
document
end
def driver_doc
{
name: DRIVER_NAME,
version: Mongo::VERSION
}
end
def os_doc
{
type: type,
name: name,
architecture: architecture
}
end
def type
(RbConfig::CONFIG && RbConfig::CONFIG['host_os']) ?
RbConfig::CONFIG['host_os'].split('_').first[/[a-z]+/i].downcase : 'unknown'
end
def name
RbConfig::CONFIG['host_os']
end
def architecture
RbConfig::CONFIG['target_cpu']
end
def platform
[
@platform,
RUBY_VERSION,
RUBY_PLATFORM,
RbConfig::CONFIG['build']
].compact.join(', ')
end
end
end
end
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