Class: Fluent::KubernetesMetadataFilter

Inherits:
Filter
  • Object
show all
Defined in:
lib/fluent/plugin/filter_kubernetes_metadata.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ KubernetesMetadataFilter

Returns a new instance of KubernetesMetadataFilter.



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# File 'lib/fluent/plugin/filter_kubernetes_metadata.rb', line 53

def initialize
  super
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/filter_kubernetes_metadata.rb', line 57

def configure(conf)
  super

  require 'kubeclient'
  require 'active_support/core_ext/object/blank'
  require 'lru_redux'

  @client = Kubeclient::Client.new @kubernetes_url, @apiVersion

  @client.ssl_options(
    client_cert: @client_cert.present? ? OpenSSL::X509::Certificate.new(File.read(@client_cert)) : nil,
    client_key: @client_key.present? ? OpenSSL::PKey::RSA.new(File.read(@client_key)) : nil,
    ca_file: @ca_file,
    verify_ssl: @verify_ssl ? OpenSSL::SSL::VERIFY_PEER : OpenSSL::SSL::VERIFY_NONE
  )

  if @bearer_token_file.present?
    bearer_token = File.read(@bearer_token_file)
    RestClient.add_before_execution_proc do |req, params|
      req['authorization'] ||= "Bearer #{bearer_token}"
    end
  end

  begin
    @client.api_valid?
  rescue KubeException => kube_error
    raise Fluent::ConfigError, "Invalid Kubernetes API endpoint: #{kube_error.message}"
  end

  @cache = LruRedux::ThreadSafeCache.new(@cache_size)
  @container_name_to_kubernetes_name_regexp_compiled = Regexp.compile(@container_name_to_kubernetes_name_regexp)
end

#filter_stream(tag, es) ⇒ Object 



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# File 'lib/fluent/plugin/filter_kubernetes_metadata.rb', line 90

def filter_stream(tag, es)
  new_es = MultiEventStream.new

  es.each {|time, record|
    if record.has_key?(:docker) && record[:docker].has_key?(:name)
      this = self
      metadata = @cache.getset(record[:docker][:name]){
        match_data = record[:docker][:name].match(@container_name_to_kubernetes_name_regexp_compiled)
        if match_data
          this.get_metadata(
            match_data[:pod_name],
            match_data[:pod_container_name],
            match_data[:namespace]
          )
        end
      }

      record[:kubernetes] = metadata if metadata
    end

    new_es.add(time, record)
  }

  new_es
end

#get_metadata(pod_name, container_name, namespace) ⇒ Object 



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# File 'lib/fluent/plugin/filter_kubernetes_metadata.rb', line 35

def get_metadata(pod_name, container_name, namespace)
  begin
    metadata = @client.get_pod(pod_name, namespace)
    if metadata
      return {
        :uid => metadata['metadata']['uid'],
        :namespace => metadata['metadata']['namespace'],
        :pod_name => metadata['metadata']['name'],
        :container_name => container_name,
        :labels => metadata['metadata']['labels'].to_h,
        :host => metadata['spec']['host']
      }
    end
  rescue KubeException
    nil
  end
end