lib/fluent/plugin/kubernetes_metadata_stats.rb
# frozen_string_literal: true
#
# Fluentd Kubernetes Metadata Filter Plugin - Enrich Fluentd events with
# Kubernetes metadata
#
# Copyright 2017 Red Hat, 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 'lru_redux'
module KubernetesMetadata
class Stats
def initialize
@stats = ::LruRedux::TTL::ThreadSafeCache.new(1000, 3600)
end
def bump(key)
@stats[key] = @stats.getset(key) { 0 } + 1
end
def set(key, value)
@stats[key] = value
end
def [](key)
@stats[key]
end
def to_s
'stats - ' + [].tap do |a|
@stats.each { |k, v| a << "#{k}: #{v}" }
end.join(', ')
end
end
class NoOpStats
def initialize
end
def bump(key)
end
def set(key, value)
end
def [](key)
end
def to_s
end
end
end